Optimal Local Voltage Control Strategy for Energy Storage Considering Global Optimization

doi:10.16628/j.cnki.2095-8188.2020.10.014

Abstract

Abstract:

In order to solve the problem of grid voltage overrun caused by high-permeability photovoltaics,give full play to the ability of photovoltaic reactive power and energy storage reactive power to adjust voltage,follow the concept of global voltage optimization and local autonomy,this paper proposed a combination of centralized and local control the two-stage coordinated voltage control strategy.Firstly,on the minute-level time scale,the global optimization is carried out based on the opportunity-constrained power flow method,and the curve-fitting method is used to generate the in-situ voltage control curve of optimal energy storage and photovoltaic.Then,the local controller monitors the voltage of the local grid connection point in real time,adjusts the power output according to the optimal control curve,and realizes the local real-time control of energy storage and photovoltaic.It can make up for the two deficiencies from the time scale to obtain the best voltage control effect.Finally,a simulation example is used to verify the effectiveness of the proposed voltage control strategy in alleviating the voltage over-limit problem and reducing the network loss.

Key words: energy storage, photovoltaic, centralized-local voltage control, curve fitting

CLC Number:

TM464

ZHANG Qiang, WU Yanan, GE Le. Optimal Local Voltage Control Strategy for Energy Storage Considering Global Optimization[J]. LOW VOLTAGE APPARATUS, 2020, 0(10): 90-97.

Figures/Tables 14

References 21

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控制曲线	系统网损/kW
线性函数	305
分段常数函数	281
分段线性函数	260