中文摘要：

受风电机组、变压器及线路的感性无功需求影响，现有风电场多需加装无功补偿装置，装置成本与补偿效果问的矛盾则是左右补偿装置类型选取的关键因素。提出采用电容器组与静止无功补偿器构成混合无功补偿系统。该补偿系统可在电网正常时协调电容器组与静止无功补偿器，实现并网点无功功率的实时、连续控制，有效提高并网点电压质量；在故障及故障恢复时刻，提高并网点电压支撑能力，减少电压恢复时间，协助风电场实现低电压穿越。在详细阐述混合补偿系统原理、结构基础上，以接入地区配电网的风电场为例，构建仿真模型并进行计算分析，所得结果验证了所提出的混合无功补偿思想的可行性与有效性。

英文摘要：

Influenced by the inductive reactive power demand of the wind turbine generators, transformers and lines, most of the exiting wind farms need install reactive power compensation devices. The contradiction between the cost and the compensation affect decides the selection of the compensation device. Thus, a hybrid reactive power compensation system which consists of capacitor banks and a STATCOM is proposed. At steady state, the proposed hybrid reactive power system can coordinate the capacitor banks and the STATCOM, compensate the reactive power of point of common coupling （PCC） dynamically and continuously, and improve the voltage quality of PCC effectively. At fault and recovery time,it can improve the voltage support capability of PCC, reduce the recovery time of voltage, and help the low voltage ride through （LVRT） of the wind farms. The principle and structure of the hybrid reactive power system were elaborated. The simulation result of a practical example shows that the study is effective and feasible.