阅读说明：本技术 一种大型糖厂分离机成组联锁时间的控制方法 (Control method for group interlocking time of separators in large-scale sugar refinery ) 是由 王志强 齐立臣 张伟 王健 迟雅丽 于 2020-11-25 设计创作，主要内容包括：本发明涉及糖厂分离机成组联锁技术领域,尤其涉及一种大型糖厂分离机成组联锁时间的控制方法,包括功率采集器装置、A相电流互感器和触摸屏,将所述功率采集器装置接入400V母线,并接通电源24VDC,使其输入额定相电压为220VAC,额定相电流为160mA,在功率采集器装置各馈出回路的电缆终端处装有A相电流互感器,所述功率采集器装置用于记录和存储电器设备的秒电功率,所述A相电流互感器具有30mm以上孔心。本发明可以达到两台机组在电磁功率上稳定配合,即在功率波形曲线上,A机正向功率与B机反向功率曲线围成的面积尽可能的大。一个分糖周期内,单机的功率曲线正负各半,类似于正弦波形,两个接近一致的功率波形做抵消配合,使输出的电功率趋于稳定。(The invention relates to the technical field of grouping interlocking of separators in a sugar refinery, in particular to a method for controlling grouping interlocking time of separators in a large-scale sugar refinery, which comprises a power collector device, an A-phase current transformer and a touch screen, wherein the power collector device is connected to a 400V bus and is connected with a power supply of 24VDC, so that the input rated phase voltage of the power collector device is 220VAC, the rated phase current is 160mA, the A-phase current transformer is arranged at the cable terminal of each feed-out loop of the power collector device, the power collector device is used for recording and storing the second electric power of electrical equipment, and the A-phase current transformer has a hole center of more than 30 mm. The invention can achieve the stable matching of the two units on the electromagnetic power, namely, on the power waveform curve, the area enclosed by the forward power curve of the machine A and the reverse power curve of the machine B is as large as possible. In a sugar separation period, the positive and negative of a power curve of a single machine are half respectively, the power curve is similar to a sine wave, and two power waveforms which are close to the same are in offsetting cooperation, so that the output electric power tends to be stable.)

1. A control method for the group interlocking time of separators in a large sugar refinery is characterized in that: comprises a power collector device, an A-phase current transformer and a touch screen, wherein the power collector device is connected to a 400V bus, and the power supply 24VDC is connected to input the rated phase voltage of 220VAC and the rated phase current of 160mA, a phase A current transformer is arranged at the cable terminal of each feed-out loop of the power collector device, the power collector device is used for recording and storing the second electric power of the electrical equipment, the A-phase current transformer is provided with a hole center of more than 30mm, the output end of the power collector device is electrically connected with a touch screen, the touch screen can inquire acquisition power, acquisition frequency, algebraic power per second and calculated value data in two modes of a data table and a trend curve, is matched with a 485 communication function, after the touch screen receives the second power data information, application software is operated to convert the data into a curve graph under a rectangular coordinate system, and the integral link of sampling, storage, transmission and curve application is realized.

2. The method for controlling the group interlocking time of the separators of the large-scale sugar refinery according to claim 1, wherein the method comprises the following steps: the model of the power collector is ZH-40127, the model of the A-phase current transformer is CTSA035, and the model of the touch screen is TPC1061 TX.

3. The method for controlling the group interlocking time of the separators of the large-scale sugar refinery according to claim 1, wherein the method comprises the following steps: the model of the 485 communication line is RVSP2X0.75, and the length is 300 meters.

4. The method for controlling the group interlocking time of the separators of the large-scale sugar refinery according to claim 1, wherein the method comprises the following steps: the A-phase current transformer CTSA035 is an open-type transformer.

5. The method for controlling the group interlocking time of the separators of the large-scale sugar refinery according to claim 1, wherein the method comprises the following steps: the touch screen TPC1061TX is arranged in a separate team operating room of a sugar manufacturing workshop, and the power supply of the touch screen TPC1061TX is also a power supply module of 24 VDC.

Technical Field

The invention relates to the technical field of group interlocking of separators in a sugar refinery, in particular to a control method for group interlocking time of separators in a large-scale sugar refinery.

Background

The power system of the sugar refinery is a 10kV single-turbine power generation system, the capacity is 12MW, the operation frequency of the power system is greatly influenced by load fluctuation, particularly, 10 250kW large centrifuges are arranged in the power plant, the working mode of the power system is short-period frequency conversion four-quadrant operation, and multiple-frequency-exceeding steam turbines or electrical brake opening is caused.

The 10 centrifuges do not run in isolation, but adopt grouping electrical interlocking, so that the equipment in each group does not work in synchronization so as to avoid impacting a power grid.

The interlocking time is mainly adjusted by observation, the time adjustment of the two groups is mainly adjusted by ensuring that one group can be accelerated and the other group can be decelerated, and the three groups ensure that only one group can be accelerated in the same time period.

However, this method has the following disadvantages:

1. two groups are not accurate, only the group is roughly formed by sense and matched with the acceleration and deceleration, but the actual electromagnetic power matching condition may not be appropriate: the interlocking time is set to be long, so that the matching effect of the group on the power is influenced, and the productivity is also influenced; the interlocking time is set to be short, the productivity is improved, but the pairing-inverse matching effect can be generated, namely, the two devices run synchronously, which is avoided to the utmost extent.

2. The three sets can ensure that only one of the three sets can be accelerated, and compared with the two sets, the visual accelerating and decelerating matching level is difficult to achieve.

Disclosure of Invention

Aiming at the problems that two groups are not accurate, only the sense organs are used for roughly forming group matching for speed increasing and reducing, but the actual electromagnetic power matching condition is not proper, the interlocking time is set for a long time, the group matching effect is influenced, the productivity is also influenced, the three groups can ensure that only one speed increasing can be realized in the three groups, the visual speed increasing and reducing matching level is difficult to achieve compared with the two groups, the effect is set for avoiding the simultaneous speed increasing, and the stable electromagnetic power matching relation does not exist.

In order to achieve the purpose, the invention adopts the following technical scheme:

a control method for the group interlocking time of separators in a large sugar refinery is characterized in that: comprises a power collector device, an A-phase current transformer and a touch screen, wherein the power collector device is connected to a 400V bus, and the power supply 24VDC is connected to input the rated phase voltage of 220VAC and the rated phase current of 160mA, a phase A current transformer is arranged at the cable terminal of each feed-out loop of the power collector device, the power collector device is used for recording and storing the second electric power of the electrical equipment, the A-phase current transformer is provided with a hole center of more than 30mm, the output end of the power collector device is electrically connected with a touch screen, the touch screen can inquire acquisition power, acquisition frequency, algebraic power per second and calculated value data in two modes of a data table and a trend curve, is matched with a 485 communication function, after the touch screen receives the second power data information, application software is operated to convert the data into a curve graph under a rectangular coordinate system, and the integral link of sampling, storage, transmission and curve application is realized.

Preferably, the model of the power collector is ZH-40127, the model of the a-phase current transformer is CTSA035, and the model of the touch screen is TPC1061 TX.

Preferably, the model of the 485 communication line is RVSP2X0.75, and the length of the 485 communication line is 300 meters.

Preferably, the a-phase current transformer CTSA035 is an open-type transformer.

Preferably, the touch screen TPC1061TX is arranged in a separate team operating room of the sugar manufacturing workshop, and the power supply of the device is also a power supply module of 24 VDC.

Compared with the prior art, the invention has the following advantages:

the invention can achieve the stable matching of the two units on the electromagnetic power, namely, on the power waveform curve, the area enclosed by the forward power curve of the machine A and the reverse power curve of the machine B is as large as possible. Within one sugar separation period (about 3min), the power curve of a single machine is respectively positive and negative half, is similar to a sine wave, and two power waveforms close to the same are in offsetting cooperation, so that the output electric power tends to be stable.

Drawings

FIG. 1 is a schematic connection diagram of a control method for the group interlocking time of separators in a large-scale sugar refinery according to the present invention;

FIG. 2 is a schematic diagram of an active power curve of a control method for a group interlocking time of separators in a large-scale sugar refinery according to the present invention.

Detailed Description

In order to further explain the technical scheme of the control method for the interlocking time of the group of separators in the large-scale sugar refinery, the specific implementation mode of the control method for the interlocking time of the group of separators in the large-scale sugar refinery is described by combining the accompanying drawings as follows:

as shown in fig. 1, the technical scheme of the control method of the group interlocking time of the separators of the large-scale sugar refinery is that the control method of the group interlocking time of the separators of the large-scale sugar refinery comprises a power collector device, an a-phase current transformer and a touch screen, wherein the power collector device is connected to a 400V bus and is connected to a power supply of 24VDC, so that the input rated phase voltage of the power collector device is 220VAC, the rated phase current is 160mA, each set of 12 current collection channels, 1 voltage collection channel and a 485 communication interface are provided, the sampling time is not more than 0.1s, and the sampling precision is not more than 0.5 level. A phase current transformer is arranged at a cable terminal of each feed-out loop of the power collector device, the power collector device is used for recording and storing second electric power of electrical equipment, the phase current transformer has a hole center more than 30mm, the output end of the power collector device is electrically connected with a touch screen, the touch screen can inquire collected power, collected frequency and algebraic sum of power generation per second and calculated value data by using a data table and a trend curve, and is matched with a 485 communication function, after the touch screen receives second power data information, application software is operated to convert data into a curve chart under a rectangular coordinate system, namely, an integral link of sampling-storage-transmission-curve application is realized, the touch screen has more than 10 inches, and is matched with the application software to realize the following functions:

(1) active power of more than 20 loops is collected, the power direction can be identified, and data of all the loops keep time sequence synchronization;

(2) the data acquisition, frequency acquisition, algebraic power generation per second and data calculation can be inquired in a data table mode and a trend curve mode, and a 485 communication function is matched;

(3) the historical curve and the data can be stored for more than 24 hours and can be exported, so that comparison and query are facilitated; the time of the trend curve is adjustable, and the default value is 10 min.

The invention relates to the field of engineering equipment control, which is characterized in that single-phase electric power of 10 paths of separators is collected into an electronic device, second power data of the separators is recorded in real time and is loaded into a human-computer interface through 485 communication, the human-computer interface arranges the data into a curve mode, the real-time performance meets the requirements of monitoring and is used as the basis for accurately adjusting the interlocking time, real-time parameters of the power of 10 separators are collected and subjected to wave formation, and then the wave forms of two devices participating in interlocking are displayed on the same screen, so that an ideal wave form phase difference can be obtained by adjusting the interlocking time. The two phase differences ensure that the electric power offset coordination of the two devices is optimal, thereby achieving the optimal interlocking effect in the true sense. I.e. the method of operating the phase difference of the two real-time waveforms corrects the interlock times of each group.

The custom device hardware inventory is as follows:

a curve graph formed by summing the second power of 10 separators displayed by a human-computer interface of a display screen is consistent with the fluctuation condition of a total load curve graph of a generator, so that the fluctuation load of a single machine network can be determined to be approximately from 10 separators, and other loads can be regarded as stable loads. The man-machine interface can inquire the power and the curve of 10 separators and can also inquire any load curve, the power curves of two paired devices are displayed on the same interface, the coordination of positive and negative power offset can be constructed intuitively according to the curve waveform, and then the interlocking time is accurately adjusted according to the curve coordinate, the horizontal axis of the coordinate axis is time s, and the vertical axis is power kW (the transformation ratio multiplying power of the mutual inductor is 20, the phase multiplying power is 3, and the coordinate value multiplied by 20x3 to be 60 times is the actual power value).

The electric power acquisition device acquires 10 paths of phase A current at the power supply side of the frequency converter of the separator and 1 path of phase A voltage signals of the low-voltage bus, the voltage current is connected into the device according to a specified direction, the power supply side of the current is a positive direction, the phase A of the voltage is a positive direction, and the phase zero of the voltage is a negative direction. The device calculates 10 paths of single-phase second power data in real time according to the access signals, the single-phase second power data are accessed into a human-computer interface through 485 communication, and the human-computer interface draws a curve according to numerical values.

Preferably, the model of the power collector is ZH-40127, the model of the A-phase current transformer is CTSA035, and the model of the touch screen is TPC1061 TX.

Preferably, the 485 communication line is RVSP2X0.75 type and 300 meters long.

Preferably, the phase a current transformer CTSA035 is an open type transformer having a hole center of 30mm or more and accuracy satisfying 0.5 level or more.

Preferably, the touch screen TPC1061TX is installed in a separate team operating room of the sugar manufacturing plant and is provided with a power supply module of 24 VDC.

As shown in fig. 2, on the active power curve P-T, a and B are power curves of two same-process separation unit sets in a working period, and the measured waveforms are similar to sine waves, and the phase difference between the waveforms of A, B will be directly influenced by adjusting the interlock time of the two devices. In this figure, the hatched area represents the best adjustment effect, theoretically the hatched area is offset, no power exchange is generated to the outside, so that on the touch screen, the interlock time is adjusted on line, the interlock time can be adjusted to the effect shown in fig. 2, and the two devices become the power performance of one device as a whole, and are pulsating, the stability of the generator set is better than that of one device, because the time for reducing the power from the positive peak value to the negative peak value is shortened, the change from increasing to reducing the power is not so violent, the rotating speed of the generator set is reduced, and the safety of the generator set is greatly improved. Therefore, under certain conditions, the more such pairings, the more stable the unit.

In practice, the electric power collecting device collects 10 paths of phase current A at the power supply side of the frequency converter of the separator and 1 path of phase voltage signal A at the low-voltage bus, the voltage current is connected into the device in a specified direction, the power supply side of the current is a positive direction, the phase voltage A is a positive direction, and the zero phase is a negative direction. The device calculates 10 paths of single-phase second power data in real time according to the access signals, the single-phase second power data are accessed into a human-computer interface through 485 communication, and the human-computer interface draws a curve according to numerical values.

The method for adjusting the interlocking time is as follows: comparing the ideal matching waveform to be adjusted with the actual waveform, knowing the time to be adjusted according to the time axis coordinate, and if the 2 groups of waveforms are too far away, subtracting the obtained adjustment time from the current interlocking time to obtain new interlocking time; otherwise, the adjustment time is added.

The invention is not limited to the precise arrangements described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.