光伏高渗透配电网分层调压控制策略

Hierarchical Voltage Regulation Control Strategy to Enable High Photovoltaic Penetrations

光伏(photovoltaic,PV)的接入改变了配电网的结构,给传统的调压方式带来了很大影响。为此提出PV高渗透配电网分层调压控制策略,该策略利用有载调压变压器(on-load tap changer,OLTC)与逆变器对网络电压进行分层调节,实现了时间和空间上的解耦。在日前进行集中控制,采用基于OLTC的最优分接头控制(optimal tap control,OTC)方法,在控制周期内进行时段划分,降低分接头动作频率;在实时进行本地控制,利用逆变器剩余的无功调节能力来修正日前预测造成的误差。以IEEE33节点系统为例进行了仿真,结果表明,所提策略可保证电压不越限的同时有效地提升PV的渗透率。

The access of photovoltaic(PV)changes the structure of distribution network and has a great impact on the traditional voltage regulation method.In this paper,a hierarchical voltage control strategy to enable high PV penetrations is proposed.In this strategy,on-load tap changer(OLTC)and inverter are used to adjust the voltage,and the abruption between time and space is realized.A centralized control is adopted in day ahead,which is an OLTC control scheme called optimal tap control.Divide the period of time during the control cycle to reduce the action frequency of the tap.A local control is adopted in real time.Using the remaining reactive power regulation ability of inverter to correct the error caused by pre-day prediction.Taking the IEEE33 system as an example,the simulation results show that the proposed strategy can effectively increase the permeability of PV while ensuring that the voltage does not exceed the limit.