交直流配电网交流侧非对称故障情况下直流侧电压波动特性分析与控制

doi:10.12204/j.issn.1000-7229.2021.11.010

电力建设 ›› 2021, Vol. 42 ›› Issue (11): 90-99.doi: 10.12204/j.issn.1000-7229.2021.11.010

交直流配电网交流侧非对称故障情况下直流侧电压波动特性分析与控制

王卫¹(), 宫成¹(), 曹文远²(), 董楠¹(), 刘慧珍¹(), 韩民晓²()

1.国网北京市电力公司,北京市 100031
2.华北电力大学电气与电子工程学院,北京市 102206

收稿日期:2021-03-25 出版日期:2021-11-01 发布日期:2021-11-02
通讯作者: 韩民晓 E-mail:bjfadianchang@sina.com;123.gc@163.com;bjcaowenyuan@163.com;dongnan114@126.com;liuhuizhenwly@sina.com;corresponding_han@163.com
作者简介:王卫(1970),女,硕士,高级工程师,主要从事电网调控网源协调技术研究工作,E-mail: bjfadianchang@sina.com;
宫成(1987),男,硕士,高级工程师,主要从事电气工程技术研究工作,E-mail: 123.gc@163.com;
曹文远(1994),男,博士研究生,主要研究方向为交直流混合配电网的控制,E-mail: bjcaowenyuan@163.com;
董楠(1981),男,硕士,高级工程师,主要从事电气工程技术研究工作,E-mail: dongnan114@126.com;
刘慧珍(1974),女,硕士,高级工程师,主要从事电气工程技术研究工作,E-mail: liuhuizhenwly@sina.com。
基金资助:
国家重点研发计划项目(2016YFB0900505)

Analysis and Control of DC Side Voltage Fluctuation Characteristics under Unbalanced Fault of AC Side in AC/DC Distribution Network

WANG Wei¹(), GONG Cheng¹(), CAO Wenyuan²(), DONG Nan¹(), LIU Huizhen¹(), HAN Minxiao²()

1. State Grid Beijing Electric Power Company, Beijing 100031, China
2. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China

Received:2021-03-25 Online:2021-11-01 Published:2021-11-02
Contact: HAN Minxiao E-mail:bjfadianchang@sina.com;123.gc@163.com;bjcaowenyuan@163.com;dongnan114@126.com;liuhuizhenwly@sina.com;corresponding_han@163.com
Supported by:
National Key Research and Development Program of China(2016YFB0900505)

摘要/Abstract

摘要：

直流配电网以其高效消纳直流电能的优势,成为未来分布式电源并网的重要方式。但是交流配电网发生非对称故障会引起与其互联的直流配电网电压波动,从而危害直流配电系统的正常运行。为此,首先,分析了交流配电网发生单相接地故障情况下有功功率和直流电压波动的特性,推导给出了滤波电感上瞬时有功功率的表达式,并指出了滤波电感上的瞬时有功功率是导致直流电压波动的重要原因。其次,提出了一种改进锁相环对正序电压的相位进行跟踪,所提方法仅对传统锁相环的补偿器进行重新设计,原理清晰,易于实现。最后,在PSCAD/EMTDC中搭建了典型的双端交直流配电系统仿真模型,验证了理论分析正确性及所提控制方法的有效性。

关键词: 交直流配电网, 非对称故障, 故障传播机理, 直流电压波动, 改进锁相环

Abstract:

DC distribution network, with its advantage of efficient absorption of direct current energy, will become an important way of connecting the future distributed generators. However, the unbalanced faults of the AC distribution networks will cause the voltage fluctuation of the DC distribution networks, which will harm the normal operation of the DC distribution system. To tackle the problem aforementioned, this paper firstly analyzes the characteristics of active power and DC voltage fluctuations in the case of single-phase-to-ground fault in AC distribution network, especially deduces the expression of instantaneous active power of filter inductance, and points out that the instantaneous active power of filter inductance is the important cause of DC voltage fluctuation. Secondly, an improved phase lock loop (PLL) is proposed to track the phase of positive-sequence voltage. The proposed method only redesigns the compensator of the traditional PLL, which is clear in principle and easy to implement. Finally, a simulation model of typical two-terminal AC-DC distribution system is built in PSCAD/EMTDC to verify the correctness of the theoretical analysis and the effectiveness of the proposed control method.

Key words: AC/DC distribution network, unbalanced fault, fault propagation mechanism, DC voltage fluctuation, improved phase lock loop

中图分类号:

TM713

王卫, 宫成, 曹文远, 董楠, 刘慧珍, 韩民晓. 交直流配电网交流侧非对称故障情况下直流侧电压波动特性分析与控制[J]. 电力建设, 2021, 42(11): 90-99.

WANG Wei, GONG Cheng, CAO Wenyuan, DONG Nan, LIU Huizhen, HAN Minxiao. Analysis and Control of DC Side Voltage Fluctuation Characteristics under Unbalanced Fault of AC Side in AC/DC Distribution Network[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(11): 90-99.

图/表 10

图1 交直流配电系统拓扑结构

Fig.1 Topology of AC/DC distribution network

图2 MMC等效拓扑结构

Fig.2 Equivalent topology diagram of MMC

图3 PLL控制框图

Fig.3 Control block diagram of PLL

图4 PLL开环传函的波特图

Fig.4 Open-loop bode plot of PLL

图5 正负序电流分解原理

Fig.5 Scheme of positive and negative-sequence current decomposition

图6 正序电流环控制框图

Fig.6 Control block diagram of positive-sequence current loop

图7 负序电流环控制框图

Fig.7 Control block diagram of negative-sequence current loop

表1 电路与控制参数

Table 1 Circuit and control parameters

图8 故障点电压波形与PLL控制效果波形

Fig.8 Voltage waveforms of fault point and the PLL

图9 交直流配电系统故障特性波形

Fig.9 Fault characteristics of AC/DC distribution network

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交直流配电网交流侧非对称故障情况下直流侧电压波动特性分析与控制

Analysis and Control of DC Side Voltage Fluctuation Characteristics under Unbalanced Fault of AC Side in AC/DC Distribution Network

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