阅读说明：本技术 一种模块化电平换流器的控制保护装置 (Control protection device of modular level converter ) 是由 张�浩 马彦宾 鲁丽娟 游涛 周钰 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种模块化电平换流器的控制保护装置,将MMC的换流器级控制保护功能和阀级控制保护功能集成在一台装置中,在上述控制保护装置内,集成了第一数字信号处理器、第二数字信号处理器、可编程门阵列以及ZYNQ模块；通过第一数字信号处理器进行换流器控制保护所需采样模拟量的通道配置、快速保护所需模拟量的前置计算,通过第二数字信号处理器生成调制波进行MMC的电压控制,通过可编程门阵列FPGA实现MMC的模拟量采样以及快速保护,通过ZYNQ模块进行MMC的逻辑顺序控制以及慢速保护。从而实现了MMC的换流器级控制保护功能和阀级控制保护功能的集成。通过实施本发明的实施例能够,降低了调试难度与信息流的延迟。(The invention discloses a control protection device of a modular level converter, which integrates the converter level control protection function and the valve level control protection function of an MMC into one device, and a first digital signal processor, a second digital signal processor, a programmable gate array and a ZYNQ module are integrated in the control protection device; the method comprises the steps of carrying out channel configuration of sampling analog quantity required by current converter control protection and pre-calculation of analog quantity required by fast protection through a first digital signal processor, generating modulation waves through a second digital signal processor to carry out voltage control of the MMC, realizing analog quantity sampling and fast protection of the MMC through a programmable gate array FPGA, and carrying out logic sequence control and slow protection of the MMC through a ZYNQ module. Therefore, the integration of the converter-level control protection function and the valve-level control protection function of the MMC is realized. By implementing the embodiment of the invention, the debugging difficulty and the delay of the information flow can be reduced.)

1. A control protection device for a modular level converter, comprising: the system comprises a CPU plug-in and a LOGIC plug-in, wherein the CPU plug-in is connected with the LOGIC plug-in; the CPU plug-in comprises a first digital signal processor, a second digital signal processor and a programmable gate array, wherein the first digital signal processor and the second digital signal processor are connected with the programmable gate array; the LOGIC plug-in includes a ZYNQ module;

the programmable gate array is used for acquiring analog quantity data and sending the analog quantity data to the first digital signal processor and the second digital signal processor;

the first digital signal processor is used for receiving the analog quantity data, performing pre-calculation of fast protection and slow protection according to the analog quantity data to obtain fast protection calculation data and slow protection calculation data, then sending the fast protection calculation data to the programmable gate array, and sending the slow protection data to the ZYNQ module;

the programmable gate array is further used for receiving the rapid protection calculation data and then realizing a rapid protection function of the modular level converter according to the rapid protection calculation data;

the ZYNQ module is used for receiving the slow protection calculation data and then realizing the slow protection function of the modular level converter according to the slow protection calculation data;

and the second digital signal processor is used for receiving the analog quantity data, then generating a modulation wave according to the analog quantity data and controlling the output voltage of the modular level converter through the modulation wave.

2. The apparatus of claim 1, wherein the programmable gate array is further configured to configure the analog data signal according to the analog channel configuration information transmitted by the first digital signal processor before transmitting the analog data to the first and second digital signal processors.

3. A control protection arrangement for a modular level converter according to claim 1, characterized in that said fast protection function comprises: bridge arm overcurrent, bridge arm differential, direct current pole overcurrent and direct current pole low voltage overcurrent protection.

4. A control protection arrangement for a modular level converter according to claim 1, characterized in that said slow protection function comprises: the protection circuit comprises an alternating current bus overvoltage undervoltage and overcurrent protection device, a direct current pole overvoltage undervoltage and overcurrent protection device and a bridge arm differential protection device.

5. The control protection device for a modular level converter according to claim 1, wherein said generating a modulation wave according to said analog data comprises:

and processing the analog quantity data according to a power outer ring control algorithm, a current inner ring control algorithm and a circulation suppression control algorithm to generate the modulation wave.

6. The control protection device of the modular level converter according to claim 1, wherein the ZYNQ module is further configured to receive analog data and switching value information sent by the first digital signal processor and the second digital signal processor, determine the state of the modular level converter according to the analog data and the switching value information, and perform the sequential control start and stop according to the state of the modular level converter.

7. The control protection device for the modular level converter according to claim 1, wherein the programmable gate array performs analog quantity collection through ADC or optical fiber.

8. The control protection device for a modular level converter according to claim 1, further comprising: AD cards, DI/DO cards, and power cards.

Technical Field

The invention relates to the technical field of data processing, in particular to a control protection device of a modular level converter.

Background

The flexible direct current transmission technology is a hot spot of the current power grid technology development. The valve arm of the Modular Multilevel Converter (MMC) is composed of a plurality of sub-modules (SM), sine wave signals are output by superposition of output levels of the sub-modules, the modular multilevel converter has the advantages of low switching frequency, low loss, small harmonic wave and the like, is easy to expand to a higher voltage level, and is the main direction of the current flexible direct current transmission research and application.

At present, the flexible and straight field of low voltage class (mainly including 10kV and 35kV) is in the rise stage, and a unified standard and an application specification are not formed yet. Related manufacturers at home and abroad basically use an architecture scheme of extra-high voltage flexible direct current transmission in the architecture of the secondary control protection system in the field, a control host and a protection host are separately configured, a converter-level control host and a valve-level control host are separately configured, and in the field of flexible direct current transmission with low voltage level, the problems of difficult debugging, large information flow delay and the like are caused by multiple scheme architecture division levels, complex architecture and multiple communication link links.

Disclosure of Invention

The embodiment of the invention provides a control protection device of a modular level converter, which integrates the functions of converter level control protection and valve level control protection, and reduces the debugging difficulty and the delay of information flow.

An embodiment of the present invention provides a control protection device for a modular level converter, including: the system comprises a CPU plug-in and a LOGIC plug-in, wherein the CPU plug-in is connected with the LOGIC plug-in; the CPU plug-in comprises a first digital signal processor, a second digital signal processor and a programmable gate array, wherein the first digital signal processor and the second digital signal processor are connected with the programmable gate array; the LOGIC plug-in includes a ZYNQ module; the programmable gate array is used for acquiring analog quantity data and sending the analog quantity data to the first digital signal processor and the second digital signal processor;

the first digital signal processor is used for receiving the analog quantity data, performing pre-calculation of fast protection and slow protection according to the analog quantity data to obtain fast protection calculation data and slow protection calculation data, then sending the fast protection calculation data to the programmable gate array, and sending the slow protection data to the ZYNQ module;

the programmable gate array is further used for receiving the rapid protection calculation data and then realizing a rapid protection function of the modular level converter according to the rapid protection calculation data;

the ZYNQ module is used for receiving the slow protection calculation data and then realizing the slow protection function of the modular level converter according to the slow protection calculation data;

and the second digital signal processor is used for receiving the analog quantity data, then generating a modulation wave according to the analog quantity data and controlling the output voltage of the modular level converter through the modulation wave.

Further, the programmable gate array is configured to configure the analog data signal according to analog channel configuration information sent by the first digital signal processor before sending the analog data to the first digital signal processor and the second digital signal processor.

Further, the fast protection function includes: bridge arm overcurrent, bridge arm differential, direct current pole overcurrent and direct current pole low voltage overcurrent protection.

Further, the slow protection function includes: the protection circuit comprises an alternating current bus overvoltage undervoltage and overcurrent protection device, a direct current pole overvoltage undervoltage and overcurrent protection device and a bridge arm differential protection device.

Further, the generating a modulated wave according to the analog data specifically includes:

and processing the analog quantity data according to a power outer ring control algorithm, a current inner ring control algorithm and a circulation suppression control algorithm to generate the modulation wave.

Further, the ZYNQ module is further configured to receive analog quantity data and switching value information sent by the first digital signal processor and the second digital signal processor, determine a state of the modular level converter according to the analog quantity data and the switching value information, and perform sequence control starting and stopping according to the state of the modular level converter.

Furthermore, the programmable gate array collects analog quantity through ADC or optical fiber.

Further, the method also comprises the following steps: AD cards, DI/DO cards, and power cards.

The embodiment of the invention has the following beneficial effects:

the embodiment of the invention provides a control protection device of a modular level converter, which integrates the converter level control protection function and the valve level control protection function of an MMC into one device, and particularly integrates a first digital signal processor, a second digital signal processor, a programmable gate array and a ZYNQ module into the control protection device; the channel configuration of the sampling analog quantity required by the control protection of the converter, the pre-calculation of the analog quantity required by the rapid protection and the comprehensive judgment of the unlocking logic are carried out through the first digital signal processor, the modulation wave is generated through the second digital signal processor to carry out the voltage control of the MMC, the analog quantity sampling and the rapid protection of the MMC are realized through the programmable gate array FPGA, and the logic sequence control and the slow protection of the MMC are carried out through the ZYNQ module. Compared with the prior art that the communication link between the original converter-level control protection device and the valve-level control protection device is omitted, the difficulty of communication debugging is reduced by reducing the debugging workload of the communication interface, and the control protection response speed of the converter valve is increased to about 200 us.

Drawings

Fig. 1 is a schematic structural diagram of a control protection device of a modular level converter according to an embodiment of the present invention.

Fig. 2 is another schematic structural diagram of a control protection device for a modular level converter according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an MMC analog sampling point configuration according to an 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 shown in fig. 1, an embodiment of the present invention provides a control protection device for a modular level converter, including: the system comprises a CPU plug-in and a LOGIC plug-in, wherein the CPU plug-in is connected with the LOGIC plug-in; the CPU plug-in comprises a first digital signal processor (DSP 1 in the figure), a second digital signal processor (DSP 2 in the figure) and a programmable gate array (FPGA in the figure), and the first digital signal processor and the second digital signal processor are both connected with the programmable gate array FPGA; the LOGIC plug-in includes a ZYNQ module, and in a preferred embodiment, the communication specific connections of the modules are as shown in fig. 1, and are connected through PORT, AMI, CAN, LVDS, and ethernet to perform data interaction.

The function of each plug-in/module is explained in detail below:

firstly, the FPGA is a programmable gate array, and the FPGA mainly realizes analog quantity sampling, communication and rapid protection (including bridge arm overcurrent, direct current pole low-voltage overcurrent and bridge arm differential) of the MMC;

for the acquisition of the analog quantity, in a preferred embodiment, the acquisition of the analog quantity is performed through DC or optical fiber, and then the analog quantity data is sent to the first digital signal processor and the second digital signal processor so as to be processed subsequently by the first digital signal processor and the second digital signal processor.

In a preferred embodiment, before sending the analog data to the first digital signal processor and the second digital signal processor, the programmable gate array further configures the analog data according to the analog channel configuration information sent by the first digital signal processor, and then sends the configured data to the first digital signal processor and the second digital signal processor.

The channel configuration includes an analog zero drift and an analog scale, for example, after the 10kV ac voltage passes through the analog conditioning circuit and the AD sampling, the corresponding code value is 8050, the theoretical calculation value is 8000, and the sampling value is 20 at 0kV, the zero drift position is 20, the scale is 8000/8030 ═ 0.99626, and the configuration is transmitted to the two digital signal processors DSP1 and DSP 2.

For the implementation of the fast protection function, the method specifically comprises the following steps: receiving fast protection calculation data obtained after fast protection calculation is carried out by a first digital signal processing module, and then realizing a fast protection function of the modular level converter according to the fast protection calculation data; the rapid protection function comprises bridge arm overcurrent protection, bridge arm differential protection, direct current pole overcurrent protection and direct current pole low voltage overcurrent protection. The implementation of the above protection functions is the prior art, and will not be described herein;

for the first digital signal processing module, the first digital signal processing module is mainly used for carrying out channel configuration of sampling analog quantity required by current converter control protection, pre-calculation of analog quantity required by fast protection and slow protection and comprehensive judgment of unlocking and locking logic.

The channel configuration function has been described above and will not be repeated here; for the pre-calculation of the analog quantity required by the fast protection and the slow protection, the method specifically comprises the following steps: the method comprises the steps of receiving analog quantity data processed by a programmable gate array, carrying out pre-calculation of fast protection and slow protection according to the analog quantity data to obtain fast protection calculation data and slow protection calculation data, then sending the fast protection calculation data to the programmable gate array, and sending the slow protection data to a ZYNQ module.

For the comprehensive judgment function of the unlocking logic, the first digital signal processing module judges whether unlocking is allowed or not according to the state of the current converter and the state of the control and protection device, and sends a judgment result to the ZYNQ module as a condition for allowing starting.

And the second digital signal processor is mainly used for carrying out MMC algorithm control, including voltage and power outer loop control, current inner loop control, circulation current inhibition, controllable charging and modulated wave output.

Specifically, the method comprises the following steps: and the second digital signal processor receives the analog quantity data, processes the analog quantity data according to a power outer loop control algorithm, a current inner loop control algorithm and a circulation suppression control algorithm, and finally generates a modulation wave for controlling the output voltage of the MMC.

For the ZYNQ module, the ZYNQ module is mainly used for carrying out logic sequence control and slow protection (comprising alternating current over-voltage and under-voltage protection, alternating current over-current protection, differential over-current protection, direct current pole over-voltage and under-voltage protection, direct current pole over-current protection, direct current pole voltage unbalance and the like) of MMC;

specifically, the slow protection calculation data of the ZYNQ module, and then the slow protection function of the modular level converter according to the slow protection calculation data includes: the protection circuit comprises an alternating current bus overvoltage undervoltage and overcurrent protection device, a direct current pole overvoltage undervoltage and overcurrent protection device and a bridge arm differential protection device.

In addition, the ZYNQ module is also used for receiving analog quantity data and switching value information sent by the first digital signal processor and the second digital signal processor, judging the state of the modular level converter according to the analog quantity data and the switching value information, and performing sequence control starting and stopping according to the state of the modular level converter, so that a logic sequence control function is realized; specifically, the analog quantity sampling value, the effective value and the differential flow value of the differential protection sent by the first digital signal processor are used for slow protection, and the switching values of valve charging completion, unlocking state and the like are obtained; and the real-time power calculation value and other analog quantities and the AC voltage fault and other switching quantities are sent by the second digital signal processor.

In a preferred embodiment, the MMC analog sampling point configuration is as shown in fig. 3, where UacD and IacD are converter grid side voltage currents, IacY is valve side currents, IbP and IbN are bridge arm currents, UdcP and UdcN are dc positive and negative voltage-to-ground, and IdcP and IdcN are positive and negative currents.

As shown in fig. 2, in a preferred embodiment, the control and protection device further includes the following other plug-ins: AD cards, DI/DO cards, and power cards. The AD plug-in is the ADC sampling plug-in of this device, and DI/DO plug-in is the switching in and switching out plug-in of the digital quantity signal of transverter, and power supply plug-in supplies power for the device, and each plug-in is connected with power bus through AD bus, DI bus, DO bus, and the specific relation of connection is as shown in figure 2.

The above embodiments are only used for illustrating the implementation scheme of the present application, and the connection and topology between the components can be changed, and any modification and equivalent transformation of the connection and topology of the individual components according to the technical principle of the present application should not be excluded from the scope of the present application.

By implementing the embodiment of the invention, the functions of converter level control protection and valve level control protection are integrated, and 3 devices including a conventional converter control device, a converter protection device and a valve level control protection device are integrated in 1 device, so that the hardware utilization rate is greatly improved, and the device cost is reduced. The communication link between the original converter-level control protection device and the valve-level control protection device is eliminated, the debugging workload of a communication interface is reduced, and the control protection response speed of the converter valve is improved to about 200 us.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.