阅读说明：本技术 一种双馈发电机励磁系统的动态特性测量方法及测量系统 (Dynamic characteristic measuring method and system of doubly-fed generator excitation system ) 是由 李善颖 谢欢 吴涛 梁浩 李长宇 曹天植 黄天啸 檀政 徐鹏 史扬 辛光明 罗 于 2020-11-25 设计创作，主要内容包括：本发明实施例提供了一种双馈发电机励磁系统的动态特性测量方法及测量系统。方法包括：获取双馈发电机的定子电压和定子电流,并计算得到双馈发电机的磁链角；根据检测到得光栅编码盘输出的圈脉冲和齿脉冲,计算得到双馈发电机的转子位置角；根据双馈发电机的磁链角和转子位置角,计算双馈发电机的定子磁链相对于转子A相轴的角度；根据双馈发电机的转子电压,转子电流以及定子磁链相对于转子A相轴的角度,得到同步旋转坐标系下的励磁电压和励磁电流,进行双馈发电机在功率扰动过程中的动态特性分析。本申请可以实现在现场测试中直观评判双馈发电机的励磁系统动态响应的特性,为实测建模及现场测试提供了高效的技术手段。(The embodiment of the invention provides a method and a system for measuring dynamic characteristics of a doubly-fed generator excitation system. The method comprises the following steps: obtaining stator voltage and stator current of the doubly-fed generator, and calculating to obtain a flux linkage angle of the doubly-fed generator; calculating to obtain a rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating code disc; calculating the angle of a stator flux linkage of the doubly-fed generator relative to a phase axis A of the rotor according to the flux linkage angle and the rotor position angle of the doubly-fed generator; and obtaining the excitation voltage and the excitation current under a synchronous rotation coordinate system according to the rotor voltage, the rotor current and the angle of the stator flux linkage relative to the rotor A phase axis of the doubly-fed generator, and analyzing the dynamic characteristics of the doubly-fed generator in the power disturbance process. The method and the device can realize visual evaluation of the dynamic response characteristic of the excitation system of the doubly-fed generator in field test, and provide an efficient technical means for actual measurement modeling and field test.)

1. A dynamic characteristic measurement method of a doubly-fed generator excitation system is characterized by comprising the following steps:

obtaining stator voltage U of doubly-fed generator_SA、U_SB、U_SCAnd stator current I_SA、I_SB、I_SCAnd calculating to obtain the flux linkage angle of the doubly-fed generator according to the stator voltage and the stator current

Calculating to obtain the rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating code disc

According to the flux linkage angle of the doubly-fed generatorAnd rotor position angleCalculating stator flux linkage of doubly-fed generatorAngle δ relative to rotor a phase axis;

according to the rotor voltage U of the doubly-fed generator_ra、U_rb、U_rcRotor current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rqAccording to said excitation voltage U_rd、U_rqAnd an excitation current I_rd、I_rqAnd analyzing the dynamic characteristics of the doubly-fed generator in the power disturbance process.

2. The method for measuring the dynamic characteristics of the excitation system of the doubly-fed generator of claim 1, wherein the flux linkage angle of the doubly-fed generator is calculated according to the stator voltage and the stator currentThe method comprises the following steps:

obtaining flux linkage differential quantity through the transformation of a three-phase stator static coordinate system and a two-phase stator static coordinate system according to the stator voltage and the stator current, and obtaining a flux linkage angle through a PI link and a differential link

3. The method for measuring the dynamic characteristics of the excitation system of the doubly-fed generator of claim 1, wherein the rotor position angle of the doubly-fed generator is obtained through calculation according to the detected ring pulse and tooth pulse output by the grating code discThe method comprises the following steps:

measuring the rotor position angle through the ring pulse and the tooth pulse output by a grating code disc arranged on a generator rotor shaft

Wherein N is_setFor setting the number of teeth of speed-measuring code-wheel, N_countAnd the counting value of the tooth pulse output by the raster code disk is read in real time.

4. The method for measuring the dynamic characteristics of the excitation system of the doubly-fed generator of claim 1, wherein the measurement is performed according to the flux linkage angle of the doubly-fed generatorAnd rotor position angleCalculating an angle delta of a stator flux linkage of the doubly-fed generator relative to a phase A shaft of a rotor, wherein the angle delta comprises the following steps:

5. the method for measuring the dynamic characteristics of the excitation system of the doubly-fed generator of claim 1, wherein the method is based on the rotor voltage U of the doubly-fed generator_ra、U_rb、U_rcRotor current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rqThe method comprises the following steps:

6. a dynamic characteristic measurement system of a doubly-fed generator excitation system is characterized by comprising:

the flux linkage angle measurement module is used for acquiring the stator voltage U of the doubly-fed generator_SA、U_SB、U_SCAnd stator current I_SA、I_SB、I_SCAnd calculating to obtain the flux linkage angle of the doubly-fed generator according to the stator voltage and the stator current

The rotor position angle measuring module is used for calculating and obtaining the rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating coding disc

A relative angle calculation module for calculating the flux linkage angle of the doubly-fed generatorAnd rotor position angleCalculating an angle delta of a stator flux linkage of the doubly-fed generator relative to a phase A shaft of a rotor;

an excitation signal calculation module used for calculating the rotor voltage U of the doubly-fed generator_ra、U_rb、U_rcRotor current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rqAccording to said excitation voltage U_rd、U_rqAnd an excitation current I_rd、I_rqAnd analyzing the dynamic characteristics of the doubly-fed generator in the power disturbance process.

7. The system for measuring the dynamic characteristics of the excitation system of the doubly-fed generator of claim 6, wherein the module for measuring the flux linkage angle calculates the flux linkage angle of the doubly-fed generator according to the stator voltage and the stator currentThe method comprises the following steps:

the flux linkage angle measuring module obtains flux linkage differential quantity through the transformation of a three-phase stator static coordinate system and a two-phase stator static coordinate system according to the stator voltage and the stator current, and obtains a flux linkage angle through a PI link and a differential link

8. The system for measuring the dynamic characteristics of the excitation system of the doubly-fed generator of claim 6, wherein the rotor position angle measuring module calculates the rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating code diskThe method comprises the following steps:

by being mounted onThe ring pulse and tooth pulse signals output by the grating code disk on the rotor shaft of the generator are used for measuring the position angle of the rotor

Wherein N is_setFor setting the number of teeth of speed-measuring code-wheel, N_countAnd the counting value of the tooth pulse output by the raster code disk is read in real time.

9. The system of claim 6, wherein the relative angle calculation module calculates the flux linkage angle of the doubly-fed generator according to the dynamic characteristic of the excitation system of the doubly-fed generatorAnd rotor position angleCalculating an angle delta of a stator flux linkage of the doubly-fed generator relative to a phase A shaft of a rotor, wherein the angle delta comprises the following steps:

10. the system for measuring the dynamic characteristics of the excitation system of the doubly-fed generator of claim 6, wherein the excitation signal calculation module calculates the dynamic characteristics of the excitation system of the doubly-fed generator according to the rotor voltage U of the doubly-fed generator_ra、U_rb、U_rcRotor current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rqThe method comprises the following steps:

11. a non-transitory computer storage medium storing computer executable instructions, wherein the computer executable instructions when executed by a processor perform the method of measuring dynamic characteristics of a doubly fed generator excitation system according to any of claims 1 to 5.

Technical Field

The invention relates to the field of generators, in particular to a dynamic characteristic measuring method and a dynamic characteristic measuring system of a doubly-fed generator excitation system.

Background

With the development of high-power devices and modern control technologies, the rotor is developed rapidly by adopting a continuous variable-speed operation technology of a high-capacity energy storage unit with two-level and three-level voltage source type AC-DC-AC variable-frequency excitation, and is gradually put into commercial application. Because the capacity of the variable frequency equipment of the alternating current excitation variable speed motor is only about 1/5 of the capacity of the main motor and has a series of advantages, the variable frequency equipment has more and more important attention, is gradually advocated by the industry, and particularly has succeeded in the application of wind power plants and pumped storage power stations.

The traditional synchronous generator adopts a concentrated excitation winding, the excitation current of the concentrated excitation winding is direct current, the rotor excitation winding of the doubly-fed generator is a multi-phase alternating current winding, the excitation voltage is symmetrical alternating current with variable phase, amplitude and frequency, and the rotor adopts two-level and three-level voltage source type AC-DC-AC variable frequency excitation, so that the doubly-fed generator realizes variable-speed constant-frequency operation. Compared with an excitation system of a traditional generator, the double-fed generator has the advantages that the alternating-current excitation control freedom degree is high, the independent adjustment of active power and reactive power can be realized, the power response speed is high, the unit operation efficiency is high, and the performance of the double-fed generator exceeds that of the traditional synchronous generator. The on-site static, no-load and dynamic performance handover test of the doubly-fed generator excitation system is key work for guaranteeing safe operation of related electrical equipment, and the accurate and efficient measuring method and measuring device can improve the accuracy of the on-site test and provide a very visual angle for later dynamic performance evaluation.

At present, three-phase alternating-current excitation voltage and excitation current signals are mostly measured in the detection of the grid-related performance of a doubly-fed generator excitation system, and whether the active power and the reactive power of the unit excitation system are completely decoupled under the condition of large disturbance, the change characteristics of the active current and the reactive current and the control characteristics of an inner ring and an outer ring of the generator alternating-current excitation cannot be visually observed.

Disclosure of Invention

The embodiment of the invention provides a method, a system and a storage medium for measuring dynamic characteristics of a doubly-fed generator excitation system, which aim to solve the problem that the evaluation of the dynamic performance of the doubly-fed generator excitation system in the prior art is not accurate enough.

In order to solve the above problems, an embodiment of the present invention discloses a method for measuring dynamic characteristics of an excitation system of a doubly-fed generator, including: obtaining stator voltage U of doubly-fed generator_SA、U_SB、U_SCAnd stator current I_SA、I_SB、I_SCAnd calculating to obtain the flux linkage angle of the doubly-fed generator according to the stator voltage and the stator currentCalculating to obtain the rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating code discAccording to the flux linkage angle of the doubly-fed generatorAnd rotor position angleCalculating an angle delta of a stator flux linkage of the doubly-fed generator relative to a phase A shaft of a rotor; according to the rotor voltage U of the doubly-fed generator_ra、U_rb、U_rcRotor current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rqAccording to said excitation voltage U_rd、U_rqAnd an excitation current I_rd、I_rqAnd analyzing the dynamic characteristics of the doubly-fed generator in the power disturbance process.

In order to solve the above problems, the embodiment of the invention also discloses a dynamic characteristic measurement method of the excitation system of the doubly-fed generatorA metrology system, comprising: the flux linkage angle measurement module is used for acquiring the stator voltage U of the doubly-fed generator_SA、U_SB、U_SCAnd stator current I_SA、I_SB、I_SCAnd calculating to obtain the flux linkage angle of the doubly-fed generator according to the stator voltage and the stator currentThe rotor position angle measuring module is used for calculating and obtaining the rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating coding discA relative angle calculation module for calculating the flux linkage angle of the doubly-fed generatorAnd rotor position angleCalculating an angle delta of a stator flux linkage of the doubly-fed generator relative to a phase A shaft of a rotor; an excitation signal calculation module used for calculating the rotor voltage U of the doubly-fed generator_ra、U_rb、U_rcRotor current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rqAccording to said excitation voltage U_rd、U_rqAnd an excitation current I_rd、I_rqAnd analyzing the dynamic characteristics of the doubly-fed generator in the power disturbance process.

In order to solve the above problem, an embodiment of the present invention further discloses a non-volatile computer storage medium, which stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method for measuring dynamic characteristics of an excitation system of a doubly-fed generator according to any of the above embodiments is implemented.

The application discloses a method and a system for measuring dynamic characteristics of an excitation system of a doubly-fed generator and a storage medium, and provides a method for measuring excitation voltage and excitation current of the excitation system under a synchronous rotating coordinate system by converting three-phase alternating-current excitation voltage and excitation current of the doubly-fed generator, so that the characteristic of dynamic response of the excitation system of the doubly-fed generator can be visually judged in field test, and an efficient technical means is provided for actual measurement modeling and field test of the excitation system of the doubly-fed generator.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a processing flow chart of a dynamic characteristic measurement method of a doubly-fed generator excitation system according to an embodiment of the present invention;

FIG. 2 shows measurement results of physical quantities of a doubly-fed generator under a steady state condition, according to an embodiment of the present invention;

FIG. 3(a) is a measurement result of a conventional excitation device corresponding to an active power step according to an embodiment of the present invention;

fig. 3(b) is a measurement result of the excitation voltage and the excitation current in the synchronous rotating coordinate system obtained by the dynamic characteristic measurement method according to the embodiment of the present invention when the active power step is detected;

FIG. 4(a) is a measurement result of a conventional excitation device corresponding to a reactive power step according to an embodiment of the present invention;

fig. 4(b) is a measurement result of the excitation voltage and the excitation current in the synchronous rotation coordinate system obtained by the dynamic characteristic measurement method according to the embodiment of the present invention when the reactive power step is performed;

fig. 5 is a processing flow chart of the dynamic characteristic measurement system of the doubly-fed generator excitation system according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.

The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the invention.

Just as mentioned in the prior art, a rotor excitation winding of a doubly-fed generator is a multi-phase alternating current winding, and excitation voltage is symmetrical alternating current with variable phase, amplitude and frequency, so that the dynamic characteristic of the generator set in the power disturbance process cannot be visually displayed, the decoupling control characteristic of power is not clear, and the relation between the excitation current and the power is not visual. In view of this, the method and the system for measuring the dynamic characteristics of the excitation system of the doubly-fed generator disclosed by the application provide a method for measuring the excitation voltage and the excitation current of the excitation system under a synchronous rotating coordinate system by converting the three-phase alternating-current excitation voltage and the excitation current of the doubly-fed generator, so that the characteristics of the dynamic response of the excitation system of the doubly-fed generator can be visually judged in a field test, and an efficient technical means is provided for the actual measurement modeling and the field test of the excitation system of the doubly-fed generator.

Fig. 1 is a processing flow chart of a method for measuring dynamic characteristics of an excitation system of a doubly-fed generator according to an embodiment of the present invention. As shown, it includes:

step S101, obtaining stator voltage U of the doubly-fed generator_SA、U_SB、U_SCAnd stator current I_SA、I_SB、I_SCAnd calculating to obtain the flux linkage angle of the doubly-fed generator according to the stator voltage and the stator current

Step S102, calculating to obtain the rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating code disc

Step S103, according to the flux linkage angle of the doubly-fed generatorAnd rotor position angleCalculating an angle delta of a stator flux linkage of the doubly-fed generator relative to a phase A shaft of a rotor;

step S104, according to the rotor voltage U of the doubly-fed generator_ra、U_rb、U_rcTurning toSub-current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rq。

In some embodiments, the rotor frequency converter of the doubly-fed generator is controlled by adopting a specific vector control method to realize decoupling control of active power and reactive power of the unit. In step S101, the stator voltage U of the doubly-fed generator_SA、U_SB、U_SCAnd stator current I_SA、I_SB、I_SCThe method can be used for directly acquiring the data of the wave recorder after the wave recorder is connected with equipment, and calculating to obtain the flux linkage angle of the doubly-fed generator according to the read stator voltage and stator current

In this embodiment, flux linkage differential quantities can be obtained by transforming the three-phase stator stationary coordinate system and the two-phase stator stationary coordinate system, and then flux linkage angles can be obtained through the PI link and the differential linkThe specific implementation process is as follows:

wherein, T_ABC/αβThe voltage U of the three-phase stator in a stationary coordinate system is shown_ABCCurrent I_ABCTransforming to a two-phase stator static coordinate system; p psi_αβ＝U_αβ-RsI_αβRepresenting the voltage U using a stationary frame of the two-phase stator_αβCurrent I_αβObtaining the differential term P psi of flux linkage_αβ，K_P+K_iThe/s represents a proportional-integral link; 1/s represents a differentiation factor.

In the step, besides physical quantities such as a magnetic chain angle, a stator voltage angle and the like, active power PS and reactive power QS of the stator of the doubly-fed generator can be obtained through calculation. The active power PS and the reactive power QS of the stator can be used for analyzing the running characteristics of the unit or analyzing the transient characteristics in the coordination aspect of the unit and the network.

In addition, in the embodiment of the present invention, the decoupling control of the power may be realized by a stator voltage orientation method, but the above stator flux linkage orientation method is often adopted in the excitation control design.

In some embodiments, in step S102, the rotor position angle can be measured by the ring pulse and tooth pulse signals output from the grating code disk installed on the rotor shaft of the doubly-fed generatorAt the same time, the rotor speed omega can be measured_rPhysical quantities.

In particular, the rotor position angleWherein N is_setFor setting the number of teeth of speed-measuring code-wheel, N_countAnd the counting value of the tooth pulse output by the raster code disk is read in real time.

In this step, the rotor rotation speed ω r obtained at the same time may be used for the analysis of the unit operation characteristics or the transient characteristics in the aspect of the network coordination.

In some embodiments, in step S103, the doubly-fed generator is determined according to the flux linkage angle of the doubly-fed generatorAnd rotor position angleCalculating the angle delta of the stator flux linkage of the doubly-fed generator relative to the rotor A phase axis, i.e.

In some embodiments, step S104 is based on generator rotor voltage U_rA、U_rB、U_rCRotor current I_rA、I_rB、I_rCThe excitation voltage U under the synchronous rotation coordinate system is obtained by utilizing the following coordinate transformation algorithm formula_rd、U_rqAnd an excitation current I_rd、I_rq。

Obtaining the excitation voltage U under the synchronous rotating coordinate system_rd、U_rqAnd an excitation current I_rd、I_rqThen according to the excitation voltage U_rd、U_rqAnd an excitation current I_rd、I_rqAnd analyzing the dynamic characteristics of the doubly-fed generator in the power disturbance process.

The application discloses a method for measuring dynamic characteristics of an excitation system of a doubly-fed generator, which is a method for measuring excitation voltage and excitation current of the excitation system under a synchronous rotating coordinate system by converting three-phase alternating-current excitation voltage and excitation current of the doubly-fed generator, can visually judge the characteristics of dynamic response of the excitation system of the doubly-fed generator in field test, and provides an efficient technical means for actual measurement modeling and field test of the excitation system of the doubly-fed generator.

The following is a specific embodiment of performing dynamic characteristic analysis by using the dynamic characteristic measurement method of the doubly-fed generator excitation system according to the embodiment of the present invention. In the embodiment, a single-machine infinite system is set up on a certain software platform, wherein the double-fed generator set adopts 300MW variable-speed pumping and storage set parameters of a certain pumped storage power station, the rated capacity is 336MVA, the rated power is 300MW, the stator voltage is 15.75kV, and the turn ratio is 2.439.

1. Excitation voltage and excitation current measurement under steady state conditions

Considering the load rated condition, that is, the active power Ps of the generator is 300MW, the reactive power Qs is 145Mvar (Ps is 0.9pu, Qs is 0.436pu), as shown in fig. 2, the measurement results of the physical quantity of the doubly-fed generator in the steady state are as follows from top to bottom: active power, reactive power, excitation voltage, excitation current, stator voltage, stator current, and terminal voltage.

2. Measurement of dynamic characteristics of excitation voltage and excitation current

And (4) inspecting the load working condition, respectively generating active power step and reactive power step, and measuring generated power (active power and reactive power), excitation voltage and excitation current signals.

Fig. 3(a) and fig. 3(b) respectively correspond to the measurement result of the conventional excitation device and the measurement result of the excitation voltage and the excitation current in the synchronous rotating coordinate system obtained by the dynamic characteristic measurement method provided by the present invention when the active power step is 4%. Wherein, in fig. 3(a), from top to bottom: active power, reactive power, three-phase excitation voltage, and three-phase excitation current, which are sequentially shown from top to bottom in fig. 3 (b): an excitation voltage d-axis component, an excitation voltage q-axis component, an excitation current d-axis component, and an excitation current q-axis component.

Fig. 4(a) and fig. 4(b) respectively correspond to the measurement result of the conventional excitation device and the measurement result of the excitation voltage and the excitation current in the synchronous rotating coordinate system obtained by the dynamic characteristic measurement method provided by the present invention when the reactive power step is performed. In fig. 4(a), the following are shown in order from top to bottom: active power, reactive power, three-phase excitation voltage, and three-phase excitation current, which are sequentially shown from top to bottom in fig. 4 (b): an excitation voltage d-axis component, an excitation voltage q-axis component, an excitation current d-axis component, and an excitation current q-axis component.

It can be seen that the measurement results of the excitation voltage and the excitation current in fig. 3(a) and fig. 4(a) are three-phase alternating current signals, from which the dynamic characteristics of the unit in the power disturbance process cannot be visually displayed, the decoupling control characteristic of the power is not clear, and the relationship between the excitation current and the power is not visual.

When an active power step occurs, as can be seen from fig. 3(b), when the active power changes, the q-axis component of the exciting current is mainly affected, and the q-axis component have a direct proportional relationship, while the steady-state values of the exciting current d-axis component and the reactive power are hardly affected. When a reactive power step occurs, as can be seen from fig. 4(b), when the reactive power changes, the d-axis component of the exciting current is mainly affected, and the d-axis component have a direct proportional relationship, while the steady-state values of the q-axis component of the exciting current and the active power are hardly affected. Therefore, by the method for measuring the dynamic characteristics of the excitation system of the doubly-fed generator, the excitation voltage and the excitation current of the excitation system of the doubly-fed generator under the synchronous rotating coordinate system are obtained, the dynamic response characteristics of the excitation system of the doubly-fed generator on site can be visually judged, the decoupling control of active power and reactive power of the excitation system of the unit is also proved, and the correctness and the effectiveness of the method provided by the invention are further verified.

After the method of the exemplary embodiment of the present invention is introduced, the measurement of the dynamic characteristics of the doubly-fed generator excitation system of the exemplary embodiment of the present invention is described next with reference to fig. 4(a) and 4 (b). The implementation of the system can be referred to the implementation of the above method, and repeated details are not repeated. The terms "module" and "unit", as used below, may be software and/or hardware that implements a predetermined function. While the modules described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.

Fig. 5 is a schematic structural diagram of a dynamic characteristic measurement system of a doubly-fed generator excitation system according to an embodiment of the present invention. As shown, it includes: a flux linkage angle measuring module 501 for obtaining the stator voltage U of the doubly-fed generator_SA、U_SB、U_SCAnd stator current I_SA、I_SB、I_SCAnd calculating to obtain the flux linkage angle of the doubly-fed generator according to the stator voltage and the stator currentA rotor position angle measuring module 502, configured to calculate a rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating code diskA relative angle calculation module 503, configured to calculate a flux linkage angle according to the doubly-fed generatorAnd rotor position angleCalculating an angle delta of a stator flux linkage of the doubly-fed generator relative to a phase A shaft of a rotor; an excitation signal calculation module 504, configured to calculate a rotor voltage U according to the doubly-fed generator_ra、U_rb、U_rcRotor current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rqAccording to said excitation voltage U_rd、U_rqAnd an excitation current I_rd、I_rqAnd analyzing the dynamic characteristics of the doubly-fed generator in the power disturbance process.

In some embodiments, the flux linkage angle measuring module 501 calculates the flux linkage angle of the doubly-fed generator according to the stator voltage and the stator currentThe method comprises the following steps: the flux linkage angle measuring module obtains flux linkage differential quantity through the transformation of a three-phase stator static coordinate system and a two-phase stator static coordinate system according to the stator voltage and the stator current, and then obtains flux linkage differential quantity through a PI link and a differential quantityObtaining magnetic linkage angle by link

In some embodiments, the rotor position angle measuring module 502 calculates the rotor position angle of the doubly-fed generator according to the detected ring pulse and tooth pulse output by the grating code diskThe method comprises the following steps: the rotor position angle is measured by ring pulse and tooth pulse signals output by a grating code disc arranged on a rotor shaft of the generator Wherein N is_setFor setting the number of teeth of speed-measuring code-wheel, N_countAnd the counting value of the tooth pulse output by the raster code disk is read in real time.

In some embodiments, the relative angle calculation module 503 calculates the flux linkage angle of the doubly-fed generator according to the flux linkage angle of the doubly-fed generatorAnd rotor position angleCalculating an angle delta of a stator flux linkage of the doubly-fed generator relative to a phase A shaft of a rotor, wherein the angle delta comprises the following steps:

in some embodiments, the excitation signal calculation module 504 is based onRotor voltage U of doubly-fed generator_ra、U_rb、U_rcRotor current I_ra、I_rb、I_rcAnd obtaining the excitation voltage U under the synchronous rotation coordinate system by the angle delta of the stator flux linkage relative to the rotor A phase axis_rd、U_rqAnd an excitation current I_rd、I_rqThe method comprises the following steps:

furthermore, although in the above detailed description several units of the dynamic characteristic measurement system of the doubly fed generator excitation system are mentioned, this division is only not mandatory. Indeed, the features and functions of two or more of the units described above may be embodied in one unit, according to embodiments of the invention. Also, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.

The embodiment of the present invention further provides a non-volatile computer storage medium, which stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method for measuring dynamic characteristics of an excitation system of a doubly-fed generator according to any of the above embodiments is implemented.

The application discloses a method and a system for measuring dynamic characteristics of an excitation system of a doubly-fed generator and a storage medium, and provides a method for measuring excitation voltage and excitation current of the excitation system under a synchronous rotating coordinate system by converting three-phase alternating-current excitation voltage and excitation current of the doubly-fed generator, so that the characteristic of dynamic response of the excitation system of the doubly-fed generator can be visually judged in field test, and an efficient technical means is provided for actual measurement modeling and field test of the excitation system of the doubly-fed generator.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.