基于多汇集风电场SVC无功补偿的研究

摘要:

随着风电场大量接入电网，常见的接入电网方式有两种: 各个风电场直接接入电网、各个风电场汇集在风电 场群汇集站再并入电网。由于多数风电场均位于电网末端，远离负荷中心，周围缺少火电和水电等其他电源的支撑 和调节，可能会对地区电网线路传输功率及电压稳定性产生较大的影响。目前，常见的解决方法有3 种: 在风电场群 汇集站处加装静止无功补偿器进行无功补偿、在各个风电场加装静止无功补偿器进行无功补偿、在各个风电场和风 电场群汇集站均加装静止无功补偿器进行无功补偿。为了使无功补偿装置安装合理化以及无功补偿最优化，并基于 这3 种补偿方法，研究了在风电场接入容量不同以及地理距离不同的情况下，静止无功补偿器( SVC) 的安装位置以及 补偿容量的问题，并通过PSASP 仿真程序验证了最优补偿的合理性，提高了系统电压的稳定性以及风电送出能力，为 风电场建设提出借鉴和理论参考依据。

Abstract:

With the large number of wind farms connecting into power grid，there are two common ways that are used to switch in the power grid: each wind farm is directly connected to the power grid，and each wind farm comes together in the collection station of wind farm group，then integrates into the grid． Since many wind farms are located at the end of power grid，away from the load center，and lack of other power sources such as thermal power and hydropower for support and regulation around them，it may have great influences on the transmission power of regional power grid and voltage stability． At present，there are three common ways to solve the problems: one is to install static var compensator for reactive compensation in the collection station of wind farm group，another is to install static var compensator for reactive compensation in various wind farm，and the last one is to install static var compensator for reactive compensation both in various wind farm and in collection stations of wind farm group． In order to make the reasonable installation of reactive compensation device and the optimal reactive compensation， the installation position and compensation capacity of static var compensator ( SVC) at the different wind farm capacity and different geographic distance are studied based on the three compensation methods． The rationality of optimal compensation is verified through the PSASP simulation results，and the system voltage stability and wind power transmission ability are improved，which can provide a reference for the construction of wind farms．