高渗透率下分布式发电对大电网稳定性的影响

为了研究高渗透率下分布式发电对大电网稳定性的影响，针对不同类型的分布式微源特性，提出了相应的并网控制策略，在此基础上建立逆变型分布式电源发电机的动态模型。通过理论分析和仿真，重点研究了分布式发电并网在不同渗透率下对电网静态电压的影响，分析了发电机转速及频率的动态特性，并探讨了不同控制策略的分布式微源在故障期间对电力系统的影响。仿真分析结果表明：微电网能够对大电网提供电压支撑，但渗透率过大会对电网稳定运行产生不利影响；采用电压源型控制策略的分布式微源，能够对故障后电网电压、频率的恢复起到积极作用。

Impacts of Distributed Generations with High Penetration Level on Voltage Stability of Power System

In order to investigate the impacts of distributed generation (DG) with high penetration level on voltage stability of power system, this paper focuses on the characteristics of different DGs, presents corresponding grid-tied control strategies and the DG generators’ dynamic model. Theoretical analysis and numerical study was conducted for the effects of the grid-connection DGs on the grid static voltage, dynamic characteristics of DG speed and frequency under different penetration levels, as well as the impacts of DGs with different control strategies on the power system during the fault. The results show that micro-grid can provide voltage support, but with the penetration increases it generates negative effect on grid stability; and the voltage source DGs can promote the recovery of grid voltage and frequency after the fault.