Principle and Implementation for Impedance Dynamic Regulator in Distribution Network
Zhu Lingyi1, Sun Jianjun1, Yang Yong2, Lu Yi3, Xu Feng3
1. School of Electrical Engineering Wuhan University Wuhan 430072 China; 2. State Grid Zhejiang Electric Power Co. Ltd Hangzhou 310007 China; 3. State Grid Zhejiang Electric Power Co. Ltd Electric Power Research Institute Hangzhou 310007 China
Abstract:As the resistance component of the line impedance of the medium and low voltage distribution network is dominant, it is difficult to compensate the line voltage drop using the traditional series capacitor method. At present, the active compensation strategy mainly aims at voltage amplitude control, resulting in a large compensation capacity and the risk of voltage stabilization induced by improper control. In view of this, this paper presents the concept of line impedance dynamic regulator. The regulator is based on series-parallel hybrid power electronic converter. By controlling the characteristics of the serial converter port into different frequency bands, positive and negative flexible adjustable R/L/C features for flexible and dynamic distribution network impedance adjustment. The paper presents the circuit topology of the impedance regulator and the control strategy of the series converter to realize the R/L/C port characteristic. The function and ability of reducing the voltage deviation of the load side under steady state are analyzed. Through simulation and experiment under the condition of linear, non-linear load and load short-circuit fault, the compensation effect on voltage amplitude/waveform deviation and the limitation effect on fault current are verified.
朱铃一, 孙建军, 杨勇, 陆翌, 许烽. 配电网线路阻抗动态调节器原理及其实现[J]. 电工技术学报, 2019, 34(zk2): 701-708.
Zhu Lingyi, Sun Jianjun, Yang Yong, Lu Yi, Xu Feng. Principle and Implementation for Impedance Dynamic Regulator in Distribution Network. Transactions of China Electrotechnical Society, 2019, 34(zk2): 701-708.
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