| 引用本文: | 王振浩,佟林,李赫,成龙,李国庆.66 kV中压配电网中性点位移电压产生机理及有源抑制方法[J].电力系统保护与控制,2020,48(4):11-21.[点击复制] |
| WANG Zhenhao,TONG Lin,LI He,CHENG Long,LI Guoqing.66 kV medium voltage distribution network neutral displacement voltage generating mechanism and active suppression method[J].Power System Protection and Control,2020,48(4):11-21[点击复制] |
|
| 摘要: |
| 分析66 kV配电网中性点位移电压产生的原因，提出一种基于有源调节技术的中性点位移电压抑制方法。通过向中性点注入电流来补偿因线路对地参数不平衡引起的不对称电流，结合实际电网运行参数，分析注入电流的幅值、相位与中性点位移电压间的约束关系，确定注入电流值。采用向电网注入恒频间谐波测量信号的系统状态辨识方法，结合电压、电流双闭环控制，实现有源逆变装置对中性点位移电压的有效抑制。最后通过基于Matlab/Simulink的配电网仿真实验及实际物理实验，验证所提方法的正确性及有效性。 |
| 关键词: 配电网 中性点位移电压 三相不平衡 有源逆变装置 注入电流 |
| DOI：10.19783/j.cnki.pspc.190297 |
| 投稿时间：2019-03-19修订日期：2019-05-16 |
| 基金项目:国家电网公司科技项目资助(SGMDTL00FCJS1800 748);吉林省科技厅项目资助(20160307014GX) |
|
| 66 kV medium voltage distribution network neutral displacement voltage generating mechanism and active suppression method |
| WANG Zhenhao,TONG Lin,LI He,CHENG Long,LI Guoqing |
| (New Technology of Modern Power System Simulation Control and Green Power Key Laboratory of the Ministry of Education Northeast China Electric Power University, Jilin 132012, China;Tongliao Power Supply Company, State Grid East Inner Mongolia Electric Power Limited Company, Tongliao 028000, China) |
| Abstract: |
| This paper analyzes the causes of neutral point displacement voltage generation in 66 kV distribution network and proposes a method for inhibiting the neutral point displacement voltage based on an active regulation techniques. It compensates for the asymmetry of the unbalanced current due to the line parameters caused by injecting current into the neutral point, and combining with actual grid operating parameters, analyzes the relationship between the amplitude and phase of the injected current and the displacement voltage of the neutral point to determine the injected current. The state identification system method that injects constant frequency harmonic measurement signal to the grid is employed, which achieves effective suppression of neutral point displacement voltage by active inverter combining with voltage and current double closed loop control. Finally, the correctness and effectiveness of the proposed method is verified by using the Matlab/Simulink-based distribution network simulation experiment and actual physical experiment. This work is supported by Science and Technology Project of State Grid Corporation of China (No. SGMDTL00FCJS1800748) and Project of Science and Technology Department of Jilin Province (No. 20160307014GX). |
| Key words: distribution network neutral point displacement voltage three-phase unbalance active inverter device injection current |
