动态无功补偿设备支撑高比例新能源系统电压稳定能力分析

Analysis of Voltage Stability Capability of Dynamic Reactive Power Compensation Devices Supporting High Proportional New Energy Systems

针对高比例新能源接入区域的电压稳定性问题,结合新能源出力间隙性和新能源机组暂态无功电压调节能力弱等特征,从新能源渗透率和新能源接入点电网强度分析高比例新能源接入区域的电压失稳影响机理,阐述SVC、SVG、调相机、分布式调相机动态无功设备输出特性,对比分析高比例新能源场景下4种无功补偿设备的支撑能力。以湘南新能源接入区域为研究场景,分析同一新能源渗透率和不同新能源渗透率故障工况算例下无功补偿设备的支撑效果,验证所提观点的正确性。

In response to the voltage stability issue in high proportion new energy access areas,the characteristics of new energy output gap and weak transient reactive voltage regulation ability of new energy units are first considered.Starting from the penetration rate of new energy and the power grid strength of new energy access points,and the mechanism of voltage instability in high proportion new energy access areas is revealed.Then,the dynamic reactive power output characteristics of SVC,SVG,phase-shifting camera,and distributed phase-shifting camera are elaborated,and the support capabilities of four types of reactive power compensation devices in high proportion new energy scenarios are compared and analyzed.Distributed phase-shifting cameras have more advantages in supporting reactive voltage and suppressing overvoltage/undervoltage in new energy stations.Finally,taking the Xiangnan new energy access area as the research scenario,the support effect of reactive power compensation equipment under fault conditions with the same new energy penetration rate and different new energy penetration rates is analyzed to verify the correctness of the proposed viewpoint.