Optimal control method for overvoltage of 500kv cables and overhead hybrid lines
A hybrid line, optimal control technology, applied in the direction of AC network voltage adjustment, etc., can solve the problems of lack of research results, lack of overvoltage research, influence of stable operation of power grid, etc., to achieve the effect of satisfying economic operation
Active Publication Date: 2015-09-02
CEEC JIANGSU ELECTRIC POWER DESIGN INST CO LTD
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[0003] Due to the large capacitance of the cable relative to the overhead line, the application of the 500kV long-distance cable line in the power grid will cause the operating voltage of the power grid to increase, which may generate high overvoltage, thereby endangering the safety of the line and equipment, and affecting the stable operation of the power grid. have an impact
[0004] At present, the part of the relevant design regulations that involves line overvoltage is mainly for overhead lines, and the overvoltage research on long-distance, large-section high-voltage cable lines is relatively scarce, and there are only few research results in actual engineering applications. For 500kV cables and overhead lines There is still a lack of comprehensive, systematic and typical research on the overvoltage of hybrid lines
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[0054] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
[0055] refer to figure 1 As shown, the 500kV cable and overhead hybrid line overvoltage optimization control method of the present invention comprises the following steps:
[0056] Step 1: Establish the model of 500kV cable and overhead hybrid line, calculate the value of power frequency overvoltage for various cable laying methods, and select the cable laying method corresponding to the smallest value of power frequency overvoltage to establish as 500kV cable and overhead hybrid line cable laying method;
[0057] Step 2: Based on the cable laying method of 500kV cables and overhead hybrid lines established in step 1, calculate the power frequency overvoltage values for various cable arrangements, and select the cable arrangement corresponding to the smallest value of power frequency overvoltage to establish as 500kV cables and cable ...
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The invention discloses a 500kV cable and overhead joint line overvoltage optimization control method which comprises the following steps: establishing a cable laying mode, a cable arrangement mode, a high-resistance configuration mode, an MOA configuration mode and a circuit breaker closing resistor mounting mode of a 500kV cable and overhead joint line; and then providing optimization control measures thereby. The 500kV cable and overhead joint line overvoltage optimization control method can meet the requirements of power grid enterprises for control on power supply safety, and also can meet the requirements for economical operation of the 500kV cable and overhead joint line. The optimization control method plays a favorable guiding role for wide application of 500kV cable and overhead joint lines in an urban power grid plan.
Description
technical field [0001] The invention relates to an overvoltage optimization control method for cables and overhead hybrid lines, in particular to an overvoltage optimization control method for 500kV cables and overhead hybrid lines based on five-element constraints. The invention belongs to the technical field of electrical engineering applications. Background technique [0002] With the continuous advancement of my country's economic system reform and industrial structure adjustment, the national economy has sustained, stable and healthy development, the demand for electricity has become increasingly strong, and the load density has increased day by day. The national "Twelfth Five-Year Plan" clearly proposes to develop UHV transmission technology, further expand transmission capacity, accelerate the construction of a modern power grid system, and improve regional backbone power grids. As the backbone grid in most areas of our country, the construction of 500kV power grid wi...
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IPC IPC(8): H02J3/12
Inventor 钱康施超许文超王震泉牛涛甄宏宁徐佩锡刘捷乐晓蓉郭学英李桃韩志锟
Owner CEEC JIANGSU ELECTRIC POWER DESIGN INST CO LTD