海上风电汇集站无功装置配置方案及其性能研究

Study on Configuration Scheme and Performance of Reactive Power Compensation Device for Offshore Wind Power Gathering Station

以江苏如东220kV蓬树海上风电汇集站为例,研究了海上风电汇集站无功装置的配置方案及其性能特点。按照无功平衡原则,分析了海上风电汇集站无功补偿容量计算方法及其配置方案。利用电力系统分析软件PSD-V2009,研究了风电出力变化对电网电压的影响及系统发生短路故障时发生风电场脱网的可能性。仿真结果表明:在风电出力变化时,采用电容器补偿,电网电压发生阶跃性变化,汇集站低压母线电压越上限;采用SVG补偿,电网电压在国标允许值范围内平滑变化。在系统故障时,采用电容器补偿存在风电场脱网的可能,而采用SVG补偿可有效避免风电厂脱网的现象。

Taking the 220 kV Pengshu offshore wind power gathering station （OWPGS） in Jiangsu Rudong for example, this paper studied the confguration scheme and performance characteristics of the reactive power compensation device for OWPGS. According to the principle of reactive power balance, analysis was made to the calculation method of reactive power compensation capacity and confguration scheme of OWPGS. The power system analysis software PSD-V2009 was used to research on the infuence on the grid voltage when the wind power changes and the possibility of the wind farm tripping in case of the power system fault occurrence. The simulation results show that when the wind power changes, the grid voltage changes by step and the voltage of OWPGS low-voltage bus voltage is over the upper limit if capacitor compensation is adopted, and the grid voltage changes smoothly within the allowable value of the national standard. When the power system fault occurred, it is possible to cause the wind farm tripping if capacitor compensation is adopted and it can effectively avoid the phenomenon of the wind farm tripping if SVG compensation is adopted.