引用本文: | 谢宁,陈晓科,徐晓刚,曾杰,张弛,楚烺.大型光伏电站角形级联STATCOM电压控制策略[J].电力自动化设备,2017,37(3): |
| XIE Ning,CHEN Xiaoke,XU Xiaogang,ZENG Jie,ZHANG Chi,CHU Lang.Voltage control strategy for delta-connected cascaded STATCOM of large-scale photovoltaic power station[J].Electric Power Automation Equipment,2017,37(3): |
|
摘要: |
大型光伏电站并网后,给配电网乃至输电网的电压、电能质量等带来一系列的影响。静止同步补偿器(STATCOM)可稳定公共连接点电压并提高分布式电源的低电压穿越能力。提出了一种适用于大型光伏电站角形级联STATCOM的电压控制策略,能够支撑电网正序电压,减少公共连接点电压波动,并抑制公共连接点负序电压,改善电网电压不平衡;再结合角形级联STATCOM相电流与线电压的约束关系,给出了角形级联STATCOM相电流指令获取方法;最后,在PSCAD中搭建仿真模型验证了所提控制方法的正确性和有效性。 |
关键词: 大型光伏电站 角形级联STATCOM 电压控制 不平衡电压 指令计算 零序环流 |
DOI:10.16081/j.issn.1006-6047.2017.03.010 |
分类号: |
基金项目: |
|
Voltage control strategy for delta-connected cascaded STATCOM of large-scale photovoltaic power station |
XIE Ning1, CHEN Xiaoke1, XU Xiaogang1, ZENG Jie1, ZHANG Chi1, CHU Lang2
|
1.Key Laboratory of New Technology for the Smart Grid Enterprise of Guangdong Province, Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080, China;2.Guangzhou Power Supply Bureau Co.,Ltd.,Guangzhou 511450, China
|
Abstract: |
The grid-connection of large-scale photovoltaic power station may impact the voltage/power quality of distribution/transmission network while STATCOM can stabilize the PCC(Point of Common Coupling) voltage and enhance the low-voltage ride-through ability of distributed generation. A voltage control strategy for delta-connected cascaded STATCOM of large-scale photovoltaic power station is proposed to support the positive-sequence voltage of grid, reduce the voltage fluctuation of PCC, suppress the negative-sequence voltage of PCC, and restrain the voltage imbalance of grid. Based on the constraint relation between the phase-current and line-voltage of STATCOM, a method for obtaining the phase-current instruction of delta-connected cascaded STATCOM is presented. The correctness and effectiveness of the proposed method are verified by PSCAD-based simulation. |
Key words: large-scale photovoltaic station delta-connected cascaded STATCOM voltage control unbalanced voltage instruction calculation zero-sequence circulating current |