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Research and Application of Test Method for Precision Load Control System of UHVDC Power Grid System
Edit: Yangzhou Kaihong Power Technology Co., Ltd. Release time: 2018-11-17

Accurate load control is an important part of UHV DC power grid system protection. Through the classification, grading, and regional management of load resources, real-time precise control of classified users' interruptible loads can be directly issued by dispatching, which can avoid a large number of changes. The power stations or lines will be turned on as a whole to minimize the social impact of power grid failures and improve the ability to prevent large grid failures.


In order to ensure the stability and reliability of the precision load control system, before the precision load control system is put into use, it needs to be fully verified and tested. Based on the characteristics of the precise load control system, this article has developed a simulation test environment based on the actual software and hardware architecture. Based on the characteristics of internal communication, it researches test methods, customizes test case drivers, and can simulate a variety of full-load operation. Operating conditions, comprehensive verification and assessment of the functional performance of the precision load control system, thereby ensuring the stability and reliability of the precision load control system. This test method has been fully applied in the R & D test process of precision load control system.


With the continuous expansion of the scale of China's power grid, China's power grid has entered a new stage of cross-regional, ultra-high voltage, AC / DC hybrid operation, and grid operation management has become more complicated. In order to ensure the quality of power supply and the reliability and economics of the power system, the grid dispatching center must accurately and accurately grasp the operation of the entire system in real time, analyze in time and make correct judgments and decisions, and take emergency measures to deal with emergency incidents when necessary. And abnormal conditions to ensure the safe, reliable and effective supply of electricity.


Accurate load control is an important part of UHV DC power grid system protection. It is mainly used to coordinate the comprehensive allocation of power grid resources and loads, to achieve mutual interaction of power, grid, and user loads, and to improve the emergency response capability of UHV faults in the power grid [1-3 ]. Through the classification, grading, and regional management of load resources, real-time and accurate control of classified users' interruptible loads can be achieved by direct dispatching of dispatching, which can avoid the occurrence of a large number of substations or overall trips of lines, and the social impact of grid failures Reduced to a minimum, and improved the ability to prevent large grid faults.


In order to ensure the stability and reliability of the load control system, the load control system needs to be verified and tested before it is put into use. At present, in the substation automation system, the verification test of the load control system is mainly through establishing the actual model and simulation of the load control system, and then analyzing and verifying it.


Although this method can test the performance of the load control system, it will take a lot of time, manpower and material resources, and the cost is relatively high. After studying the simulation and discrimination methods of the precision load control system [13-17], in order to fully verify the relevant functions and performance of the precision load control system, based on the previous research on the automatic test system of intelligent substations [6-11], this article provides A test environment and test method for a precise load control system are used to solve the problem of high cost when testing a load control system in the prior art, and at the same time, it can comprehensively verify and evaluate the functional performance of the precise load control system, thereby ensuring Reliability and stability of precision load control system.


The precision load control system includes the main control station, the main station, the sub-station and the negative control terminal [4-5]. The host of the main control station communicates with the host of the main station, and the host of one main station communicates with the host of 8 sub-stations. The host of each substation is connected to 8 communication interface expansion devices, and each communication interface expansion device is connected to 30 negative control terminals.


Each negative control terminal sends the corresponding load to the corresponding slave station host, and the slave station host sends the load to the master station host. When the load needs to be cut off, the host of the co-control master station sends a load cut command to the master of the master station.


Calculate and analyze, get the load that the host of each sub-station needs to cut off, and send the corresponding load-cut instruction and the load that needs to be cut off to the host of each sub-station. When the sub-station host receives the load shedding command and the load amount to be removed, it controls the negative control terminal to remove the corresponding load amount through the corresponding communication interface.


According to the total load shedding command issued by the main station, the master station reasonably allocates the cutting level and load amount of each substation, and presets a custom control word according to the default 8 substation scale, which is used to set the substation load shedding priority from low Corresponding to the priority of 1-8, the sub-station load is cut in this order. According to the load information sent by the sub-stations, the information such as the load capacity of each priority can be counted and used for load-cutting strategy and sent to the main station.


According to the total load load issued by the master station, the host of the slave station reasonably allocates the level and load of each negative control terminal according to the priority of the negative control terminal address from low to high. According to the load information sent by the negative control terminal, statistics are collected. Information such as the load shedding capacity of each priority is used for load shedding strategy and is sent to the host.


2 Test environment composition


The test environment includes a test device, a master host, and a slave host. The test device has a co-controlled master simulation module, a slave master simulation module, and a negative control terminal simulation module to form a closed-loop test system, as shown in Figure 2. As shown.


Figure 2 Test environment

Research and Application of Test Method for Precision Load Control System of UHVDC Power Grid System


2.1 Cooperative Control Station Simulation Module


The communication interface of the cooperative control station simulation module is used to communicate with the master station host of the load control system under test. The cooperative control station simulation module is used to send a simulated load cut command to the master station of the load control system to be tested. The main host of the system receives the feedback command and tests the performance of the main host of the load control system under test according to the simulated load shedding command and the feedback command.


2.2 Slave host analog module


The communication interface of the slave station simulation module is used to communicate with the master station of the load control system. The slave station simulation module is used to send the simulated load to the master station of the load control system to be measured, and to receive the master station of the load control system to be measured. The control command of the host computer, and judge the control command.


2.3 Negative control terminal analog module


The communication interface of the negative control terminal simulation module is used to communicate with the substation host of the load control system. The negative control terminal simulation module is used to send the simulated load to the substation host of the load control system to be tested and to receive the substation of the load control system. Load shedding command, and feed back the simulation result of load shedding to the main station of the load control system substation.


3 test case design


3.1 Analysis of hardware characteristics


The test device is designed with a mature software and hardware platform [12] architecture. The main hardware structure is shown in Figure 3. The central processing unit CPU has four 2M fiber optic interfaces and two communication expansion devices. Four 2M optical fiber interfaces are used to connect to the host of the load control system under test, and the central processing unit CPU is connected to the corresponding communication expansion equipment through Ethernet.

Research and Application of Test Method for Precision Load Control System of UHVDC Power Grid System


3.2 Use Case Compilation


The cooperative control station transmits and receives data through four 2M interfaces. The communication method is shown in Table 1. The address code corresponds to the address of the receiving device. In normal communication, the data frame data is 0x5500 + address code. When the load is required to be cut, the command frame is sent. The data of the command frame is 0x9900 + address code.


In the design of test cases, the test codes of the master and slave hosts of the precision load control system can be set. The minimum value is 0 and the maximum value is 255. When it is set to 0, it means that the master host is not actually put into use.


According to different test conditions, it is flexible to control the sending time of the command code. It is common to send a load shedding command with a duration of 1 s. In order to ensure the reliability of the command interaction, the load shedding command code and the inverse code of the load shedding command are set in the communication message. The load shedding command code sent by the cooperative control master station is always 0x00, and the inverse code is 0xFF. How much load to cut, if the amount of control load sent by the cooperative control master station is 0, it means that all the loads need to be cut.

Research and Application of Test Method for Precision Load Control System of UHVDC Power Grid System

The substation host simulation module communicates with the main station host through 8 2M ports to simulate the substation host of the load control system under test.


The data of the 8 2M communication interfaces connected to the analog module can be set independently, and the receiving and monitoring are automatically determined. In normal communication, the data frame data is 0x5500 + address code. The sending frame number and channel status can be set or checked by the actual communication link. The frame number and channel status are sent according to the set parameters, and the normal and abnormal data is simulated. The impact of the master host.


The data of each level can be set and set respectively through the interface, and the boundary values such as the maximum value and the minimum value can be simulated and tested. The slave station host simulation module can also receive the load shedding command sent by the master station, and automatically determine the correctness of the load shedding command of the master station of the load control system under test based on the hierarchical load sent.


The 100M optical port is mainly used to simulate the receipt of data by the negative control terminal. See Table 2 for sending and receiving data messages. The destination address is the MAC address of the receiving network port of the host device of the substation of the precision load control system under test. The source address is the MAC address of the current network port. The Ethernet frame type is a custom type 0xEB90. The message length is the total length of the valid data, starting from byte 17 and ending. The number of high-speed serial port packets indicates how many 2M optical serial port data is contained in the data. Each 100M port supports sending up to 30 optical serial port data.


The board information indicates which board sends the data. The message validity information is used to identify the error identification of packet packing or transmission: Bit0 is the message error flag, Bit1 is the CRC error flag, and Bit2 is the message length error flag. The nth packet of data contains the messages defined in Table 2. Each time it is sent and received according to a maximum of 30 packets of data.


4 Application examples


After the development of the precision load control system test device, the function and performance of the single device and the entire system in the precision load control system can be tested. The test items that can be completed are as follows: 1) Simulation of communication abnormality; 2) Action logic of load cut command Test; 3) Strategy blocking function test; 4) Load shedding strategy test; 5) Load shedding system simulation test; 6) The entire group response time test; 7) System stress test.


After analyzing and researching the precise load control system, the test cases and monitoring methods were gradually improved. During the R & D and testing of related products, sufficient test verification was performed to ensure the stability of the function and performance of the precise load control system.


4.1 The whole set of response time test


The precise load control system requires that after the system is disturbed, bipolar lockout of the DC system is prevented [16], and the load must be accurately cut off in a short time to prevent the power system from oscillating and transferring larger currents. The command response time of the host, the host of the substation, and the negative control terminal puts forward strict requirements, and it is required that the response time of each device after receiving the control command should be less than 10ms.


Through the closed-loop test system shown in Fig. 2, the command sending time is recorded when the cooperative control head station sends the load-shedding control command, and the command feedback time is automatically recorded according to the feedback command from the master of the master station, thereby realizing the test of the single device command response time . According to the test results, the command response time of each test device is within 10ms, the general terminal circuit breaker operation time is about 100ms, and the communication delay of the communication extension device is in the microsecond level, so that the operation time of the entire system can be guaranteed at 130ms The load is precisely removed within the machine.


This test system performs system-wide simulation tests by combining with the RTDS simulation system. According to the strategy of two master stations, 4 sub-stations and 960 negative control terminal nodes in cooperation with the test device, the main station master, sub-station hosts and negative control terminals And the response performance was verified by simulation. Under the full-load operating environment, the entire set of operation time is further analyzed and tested. When simulating various faults and load transfers, the master host and the slave host can accurately load cut according to the preset strategy. The test results and Figure 2 test system test action time is consistent.


4.2 Abnormal simulation test


The test module provides various data settings and settings, which can simulate and verify abnormal data through the interface or background, such as the abnormal blocking logic of the policy function: the policy function blocking signal and the policy function status signal are mutually exclusive, that is, the policy function The policy function lockout flag is set when it fails; on the contrary, when the policy function lockout signal appears, there must be a failure in the inputted policy function.


For the case where the strategy function contains multiple trigger conditions, if any of the trigger conditions does not meet the criteria and the strategy function fails, the action strategy function is locked. When the device detects that the communication channel with the main station is abnormal, the overall function of the device is blocked, and the priority setting is incorrect, the device blocks the strategy and lights up the strategy blocking lamp.


4.3 System pressure performance test


During the application of the precision load control system, the network is more demanding, and some abnormal network data should not cause the entire group to reduce the response time performance. Each test module in the test device assigns priority to various types of information, which can simulate the transmission of abnormal data during the normal data transmission process, and evaluate the response of various devices of the precise load control system in different network environments.


When using this test system to perform network stress performance tests, the devices in the early stages of development did not handle exceptions properly, often with incorrect strategies or slow response times. After repeated verification tests, the current exception handling and The monitoring is more and more perfect, and the time response performance is more stable, thereby ensuring the stable operation of the precise load control system in engineering applications.


Conclusion: Through the research and analysis of the precision load control system, the built test system and test plan played an important role in the development and improvement of the relevant devices of the precision load control system, and fully verified the operating conditions of the precision load control system. .


With the increasing integration of AC-DC hybrid power grids, higher requirements are placed on the safe and stable operation of regional power grids. Using this test system and test method can fully simulate and simulate the operating conditions of accurate load control systems, and find them early. And solve the problems related to the reliability of precision load control system products and possible problems under long-term operation, thereby ensuring more stable operation of the power grid.


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Copyright: Yangzhou Kaihong Power Technology Co., Ltd. Technical support: Yangzhou Fanke Network Technology Co., Ltd. 苏 ICP 备 17010109 号 -2 Mobile version