基于MGP并网的新能源厂站无功–电压特性研究
Research on Reactive Power-Voltage Characteristics of Renewable Energy Plants Based on the Motor-Generator Pair Grid Connected System

新能源接入规模增大和直流输电馈入比例的增加使得电力系统的动态无功储备不足，电压调节能力急剧下降，同步电机对(Motor-Generator Pair, MGP)并网技术能够有效提高新能源机组对电网电压的支撑能力，增大系统的无功调节能力。本文围绕MGP并网技术，首先阐述了新能源采用MGP并网的基本原理，分析了在电网暂态电压过程中MGP的无功响应和电压隔离特性，并与同步调相机进行对比，最后提出和分析了提升MGP对新能源电网电压支撑能力的方法。
The increase in the scale of renewable energy and the proportion of DC transmission feeds have made the dynamic reactive power reserve of the power system insufficient, and the voltage regulation capability also has dropped sharply. The MGP (Motor-Generator Pair) system can improve the voltage support ability of renewable energy units, and the regulation ability of reactive power can be also enhanced. Based on the MGP, firstly the grid integration of renewable energy via MGP is demonstrated in the paper, and then the reactive power response and voltage isolation characteristics during transient grid voltage is discussed, then MGP is compared with synchronous condenser. And finally the method of improving the voltage support of power grid for MGP is proposed and analyzed.