新型配电网分布式电源(Distributed Generation,DG)引起的低压侧电压波动是影响用户电能质量的关键因素.文中针对新型配电网的电压调节问题,在电网无功充足的条件下,提出了一种基于有载调压变压器(On-load Tap Changer,OLTC)与模块化配电变压器(Modular Distribution Transformer,MDT)的分层逐级协同调压策略.该策略首先提出电压断面质量这一概念并给出不同情况的建模方法,然后将电压波动范围分为三个区间:区间 1 为正常区间、区间 2 为轻微越限区间、区间 3 为严重越限区间.考虑到经济性和MDT的快响应性,策略将MDT作为主要调节方式,OLTC作为后备调节手段.最后通过仿真对比不同策略下的调节效果,验证了所提策略的合理性.
Research on Hierarchical Step-by-step Cooperative Voltage Regulation Strategy of Distribution Network with DG Based on MDT
The voltage fluctuation on the low voltage side caused by the distributed generation(DG)in the new distribution network is the key factor affecting the power quality of users.This paper aims at the voltage regulation problem of the new distribution network,proposes a hierarchical and gradual cooperative voltage regulation control strategy based on on-load regulation transformer(OLTC)and modular distribution transformer(MDT)under the condition of sufficient reactive power.In this strategy,the concept of voltage cross section quality is first proposed and the model in different conditions is given.Then the voltage fluctuation range is divided into three intervals:Interval 1 is the normal region,interval 2 is the slight over-limit region,and interval 3 is the serious over-limit region.Considering the economy and fast response of MDT,the strategy uses MDT as the main adjustment mode and OLTC as the backup adjustment means.Finally,by comparing the effect of voltage regulation with simulation,the rationality of the proposed strategy is verified.
new distribution networkdistributed generationgradual cooperative voltage regulationmodular distribution transformer
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