基于瞬态搜索优化的电压型分布式光伏-VSG功频参数整定优化

Optimal Setting of Power and Frequency Parameters for Voltage-type Distributed Photovoltaic-Virtual Synchronous Generator Based on Transient Search Optimization

随着分布式光伏渗透率的提高,传统能源机组占比持续下降,电力系统所具备的惯量和一次调频能力不断降低。因此,挖掘低惯量系统下分布式光伏的频率支撑能力显得十分关键。基于此,文中首先提出了改进变备用率的电压型分布式光伏虚拟同步机(VSG)频率主动支撑方法,以增强系统惯量、减少响应时延,提升分布式光伏主动参与系统频率支撑的能力。然后,提出了基于瞬态搜索优化算法的功频参数整定优化选取模型,以求解分布式光伏最优初始备用功率和最佳调频参数,改进了光伏初始备用功率固定的局限性。最后,将所提模型分别应用于单机模型及高渗透率分布式光伏接入的实际台区,以验证其有效性。

With the increasing penetration of distributed photovoltaic(DPV),the proportion of traditional energy units continues to decline,resulting in a reduction of inertia and primary frequency regulation capabilities in power systems.Therefore,it is crucial to explore the frequency support capabilities of DPV in low-inertia systems.On this basis,first,this paper proposes an improved frequency active support method for voltage-type DPV-virtual synchronous generator(DPV-VSG)with variable reserve rate to enhance the system inertia,reduce the response delay,and improve the ability of DPV for active participation in system frequency support.Then,an optimal selection model for setting the power and frequency parameters based on the transient search optimization(TSO)algorithm is proposed to solve the optimal initial reserve power and best frequency regulation parameters of DPV,which improves the limitation of fixed photovoltaic initial reserve power.Finally,the proposed model is applied in a singlegenerator model and an actual distribution station area model with high penetration of DPV to verify its effectiveness.