Unbalanced current optimization method of series capacitor compensation device based on genetic algorithm
A technology of series capacitor compensation and balancing current, applied in the field of electric power engineering, can solve the problems of abnormal interference of CT and secondary electric circuit, discharge phenomenon of capacitor bank, etc.
Active Publication Date: 2017-01-04
EXTRA HIGH VOLTAGE POWER TRANSMISSION NANJING OF CHINA SOUTHERN POWER GRID +1
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Problems solved by technology
The high-voltage test team inferred that there may be two reasons for the failure: 1) There is abnormal interference in the CT that detects the unbalanced current and the secondary circuit
2) The capacitor bank may be discharged
The number of system states far exceeds the computing power of the computer, and it is difficult to find the system state with the smallest system unbalanced current by traditional methods
Method used
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Embodiment 1
[0048] In this embodiment, the capacitor bank of Yumao I-line series capacitance compensation device is selected for analysis. The capacitor bank adopts symmetrical H-type wiring, and the capacitor units are symmetrically connected to the four arms of the H arm, which are A arm and B arm respectively. , C arm and D arm, each H arm is composed of 3×11 capacitor units connected in series and parallel, 3 capacitor units are connected in series to form a group, and 11 groups are connected in parallel to form an H arm, a total of 132 capacitor units, bridge An unbalanced current transformer is installed at the arm to protect the system by taking the unbalanced current between the two capacitor banks to monitor the capacitor unbalanced current. Assume that the current in the line is 330A.
[0049] According to the unbalanced current optimization method of the series capacitor compensation device based on the genetic algorithm of the present invention, the optimization process includ...
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The unbalanced current optimization method of the series capacitance compensation device based on the genetic algorithm includes the following steps: (1) Construct the maternal chromosome according to the installation situation of the capacitor bank in the series capacitance compensation device; (2) Set the constraints of crossover and mutation according to the actual needs Conditions, number of elite sequences T, mutation probability Pm, maximum number of cycles K, and fitness threshold F; (3) Establish a fitness function formula reflecting the unbalanced current in the capacitor bank, and calculate the fitness of chromosomes according to the fitness function formula ; (4) Constantly optimize the chromosome through the steps of self-crossover, mutation and selection; (5) Provide the adjustment scheme of the capacitor unit in the capacitor bank according to the optimal progeny chromosome. The invention quickly finds an adjustment scheme for effectively reducing the unbalanced current of the capacitor group by adopting a genetic algorithm, improves the certainty of adjustment control, shortens the fault processing time of the series capacitor compensation device, and improves work efficiency.
Description
technical field [0001] The invention belongs to the technical field of electric power engineering, and in particular relates to an unbalanced current optimization method of a series capacitor compensation device based on a genetic algorithm. Background technique [0002] With the development of the power system, the transmission distance and transmission capacity are constantly increasing. Although the power resources such as water and fire can be fully and reasonably utilized, the problem of system stability has become increasingly prominent. Due to the constraints of environmental protection, the interconnection of large-scale power grids, and the fierce competition in the power market, the operating conditions of the power system are getting closer and closer to various safety and stability limits. The destruction of stability may endanger the entire power system and cause serious consequences, so the requirements for system stability are constantly increasing. At the sa...
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IPC IPC(8): H02J3/18G06N3/12
Inventor 曾星宏陈碧云张耀山陈绍南罗赞琛钟宏乐陈光叶波陆韦伟齐妙杨广源覃琦钟一心
Owner EXTRA HIGH VOLTAGE POWER TRANSMISSION NANJING OF CHINA SOUTHERN POWER GRID