Control and Protection of 500kV Series Compensation Station in Dafang

Abstract: Dafang 500kV series compensation station control and protection information is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abstract: For the first time, the North China Power Grid adopts series compensation technology in the transmission lines of the domestic power grid, and sets up series compensation equipment. The configuration of the control and protection system of the whole system of the Dafang 500kV series compensation station is introduced in detail, as well as the corresponding composition and control relationship. cast. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the control and protection of the 500kV series compensation station in Dafang. For the first time, the North China Power Grid adopts series compensation technology in the transmission lines of the domestic power grid, and sets up series compensation equipment. The configuration of the control and protection system of the whole system of the Dafang 500kV series compensation station is introduced in detail, as well as the corresponding composition and control relationship. Since it was put into operation, the operation has been basically good, which has effectively ensured the safe and stable operation of the power grid, and provided experience for other power grids to implement series compensation technology. 0 INTRODUCTION The use of series compensation equipment in the ultra-high voltage transmission network of the power system is a mature technology in foreign countries, but it is not very common in China. After calculation, in the northeast—After the North China interconnection, the 500kV line was moved to Suiyu“0”During the power flow, the stability limit of the 500kV line in Dafang was reduced from 1579MVA to 1442MVA. After connecting to Central China, the stability limit of the Dafang line decreased by 7%; in order to overcome the adverse impact of the interconnection on the stability level of the North China power grid, series compensation capacitors were installed in the Dafang line. . On the one hand, China North China Electric Power Corporation dispatched personnel to investigate the system planning, construction and operation of series compensation in foreign power grids, as well as the equipment manufacturing and operation performance of various manufacturers; on the other hand, it arranged to study fixed series compensation and adjustable series compensation technology (including TCSC), in the early stage of building 500kV lines in large houses, the possibility of setting up series compensation has been planned. In the delivery project of Tuoketuo Power Plant, the design unit and relevant scientific research departments have been arranged in advance to make a lot of technical preparations. Experts' demonstration and meeting review concluded that setting a series capacitor in the middle of the line is the most mature, reliable and simple technology, which can fully meet the requirements of stable operation of the power grid. In addition, the construction period of this project is short, and it is required to be put into operation synchronously when it is connected to the North China and Northeast Power Grids. It is recommended to use mature and reliable technologies and equipment to ensure the construction progress during the construction period. After demonstration, the fixed series compensation technique is adopted. The first series compensation project in China is in the transmission project of Yangcheng Power Plant. In Sanbao Substation, series compensation equipment is set up, and the equipment of Siemens is used. The second one is the Dafang 500kV series compensation project, which was adopted by North China Power Grid for the first time, and the addition of series compensation equipment to the 500kV line is the first in China. After global bidding and evaluation, the whole set of equipment is selected from ABB's products. 1 Series Equipment of Dafang 500kV Series Compensation Station Dafang 500kV Series Compensation Station is located in Yuxian County, Zhangjiakou City, 127km away from Datong Power Plant and 161km away from Fangshan Substation. Each circuit is provided with a set of series compensation devices with a rated current of 2100A. The rated impedance of each phase is 28.4n, the rated capacity of each three-phase group is 375.7Mvar, the line compensation degree is about 35%, and the overvoltage protection level of the series compensation device is 2.3 (per unit value). The series compensation station is an unmanned and manned station. It is dispatched by the North China Power Grid and controlled by the dispatching office of Zhangjiakou Power Supply Company. A monitoring station is set up in the 110kV substation in Nanzhangzhuang, which is operated and maintained by Zhangjiakou Power Supply Company. The series compensation system consists of bypass isolation switch, series isolation switch, capacitor bank, damping circuit, gap, zinc oxide arrester, bypass switch, optical cable primary equipment and computer control system, remote transmission equipment, communication system, monitoring system, remote control system etc. composition. As shown in Figure 1. 2. Protection equipment of series compensation station Each part of series compensation station is equipped with two sets of identical protection equipment, redundant settings, namely A set of protection system (MACH2(A)) and B set of protection system (MACH2(B)). All protection functions are done by MACH2. The acquisition of the protection system is completed by the photocurrent transformer (TA for short) and the optical system on the series compensation platform. Each TA has two independent measurement channels to transmit information to protection system A and protection system B respectively. Each system includes the following protective equipment. 2.1 Capacitor unbalance protection (U1) The capacitor unbalance protection is to monitor the operation status of the capacitor bank through the change of the current measurement value of the capacitor bridge wiring. At the same time, the effects of unbalanced currents on capacitor banks caused by blown capacitor fuses and capacitor bushing flashovers are also monitored. The protection has three-stage fixed value and three-stage time limit: alarm, low-set value bypass, and high-set value bypass. Alarm and low set bypass are related to unbalance current and capacitor current (line current). High-set bypass is only relevant for unbalanced currents. Alarm and low-set bypass are automatically blocked at low line current. *Blocking is given respectively when the low-set bypass and high-set bypass act.

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