配电网线路阻抗动态调节器原理及其实现

doi:10.19595/j.cnki.1000-6753.tces.L80516

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摘要由于中低压配电网的线路阻抗中电阻分量占主导,因此线路压降难以使用传统的串联电容方式实现补偿。而目前有源方式的补偿策略主要以电压幅值控制为目标,造成补偿容量偏大且存在由于控制不当诱发的电压稳定风险。针对此,提出线路阻抗动态调节器的理念,该调节器基于串并联混合电力电子变换器,通过将串联变换器端口特性控制成不同频段下大小、正负灵活可调的R/L/C特性,从而实现灵活且动态的配电网阻抗调节功能。该文提出阻抗调节器的电路拓扑及串联变换器实现R/L/C端口特性的控制策略,分析稳态下减小负载电压偏差的作用和能力;提出基于虚拟阻抗引入电压前馈控制的短路电流控制策略来实现故障电流的柔性限制,分析有源补偿作用下短路电流变化特征、串联变流器功率交互及直流侧电压平衡控制效果。通过在线性、非线性负载及负荷发生短路故障下的仿真与实验,验证了该文所提方法对电压幅值/波形偏差的补偿效果及对故障电流的限制效果。

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	朱铃一
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	杨勇
	陆翌
	许烽

关键词 ：线路阻抗, 动态调节, 电压偏差, 谐波抑制, 补偿策略, 故障电流

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.

Key words： Line impedance dynamic regulation voltage deviation harmonic suppression com- nsation strategy fault current limit

收稿日期: 2018-06-30 出版日期: 2020-01-02

PACS:

TM76

作者简介: 朱铃一男,1992年生,硕士,研究方向为电能质量分析及治理等。E-mail: 32307250@qq.com;孙建军男,1975年生,教授,研究方向为大功率电力电子技术应用及其研究、电能质量分析及治理等。E-mail: jjsun@whu.edu.cn（通信作者）

引用本文:

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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