级联式光伏电站直流并网拓扑及其控制策略

罗宇强; 谭建成; 董国庆

引用本文:	罗宇强,谭建成,董国庆.级联式光伏电站直流并网拓扑及其控制策略[J].电力系统保护与控制,2016,44(13):14-19.
	LUO Yuqiang,TAN Jiancheng,DONG Guoqing.Topology of direct-current connecting cascaded photo-voltaic power station to power grid and its control strategy[J].Power System Protection and Control,2016,44(13):14-19

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级联式光伏电站直流并网拓扑及其控制策略
罗宇强^1,2,谭建成¹,董国庆³
(1.广西大学电气工程学院, 广西南宁 530004;2.广西水利电力职业技术学院, 广西南宁 530004; 3..国网电力科学研究院武汉南瑞有限责任公司，湖北武汉 430074)

摘要:

为解决光伏电站远距离输送并网问题，同时提高光伏电站并网系统稳定性，将光伏电站与电压源型高压直流(Voltage Source Converter-High Voltage Direct Current，VSC-HVDC)输电系统相结合，设计了一种光伏电站通过级联直流变换器经VSC-HVDC输电线路并网拓扑方案。研究了光伏发电模块均压特性，分析了光伏发电模块控制策略和VSC换流站直流电压控制策略，提出了改进的直流电压-功率偏差斜率控制策略。在PSCAD/EMDTC电磁暂态软件下进行了不同光照强度仿真分析。仿真结果验证了系统可行性，表明了所提出控制策略有效保持光伏电站系统电压稳定性。

关键词: 光伏电站电压源型高压直流输电系统直流并网直流电压偏差直流电压斜率

DOI：10.7667/PSPC151316

分类号:

基金项目:

Topology of direct-current connecting cascaded photo-voltaic power station to power grid and its control strategy

LUO Yuqiang^1,2,TAN Jiancheng¹,DONG Guoqing³

(1. College of Electrical Engineering, Guangxi University, Nanning 530004, China;
;2. Guangxi College of Water Resources and Electric Power, Nanning 530004, China;
;3. State Grid Electric Power Research Institute Co., Ltd., Wuhan NARI, Wuhan 430074, China)

Abstract:

In order to solve long-distance integration of photovoltaic (PV) power station to power grid, and improve the system stability of grid-connected PV power station, the PV power station is integrated with voltage source converter high voltage direct current (VSC-HVDC) system, a topology of direct-current connecting cascaded photovoltaic power station to power grid via VSC-HVDC system is proposed. The voltage characteristics of PV module and the control strategy for PV module and DC voltage control strategy for VSC station are analyzed, thus, an improved control strategy of DC voltage margin & droop is put forward. The system and proposed control strategy are simulated under PSCAD/EMDTC electromagnetic transient software by different irradiation conditions. Simulation results show the feasibility of the system, indicating that the proposed control strategy can effectively maintain the system voltage stability of PV power station.

Key words: photovoltaic station voltage source converter high voltage direct current (VSC-HVDC) DC integration DC voltage margin DC voltage droop

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