A New Generalized Integrated Load Model and Its Equivalent Description Based on a Variety of New Energy Loads

Z. Xiaodong, Rao Yingqing, Zhang Zhenan, Rao Yufei, Yang Jun, Wang Xin
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引用次数: 1

Abstract

With the addition of new distributed energy sources, a new and more accurate load model need to be established. Based on MATLAB/Simulink, this paper researches on the modeling and simulating of photovoltaic power generation system and battery energy storage and their equivalent model. First, a detailed model of the photovoltaic system is built. Boost circuit and MPPT control are selected on the DC side of photovoltaic power generation system. The double closed loop control method of current internal loop and external voltage loop is used for grid inverter control. The model is improved considering the capability of LVRT (low voltage ride through). Based on the above precise models, the model is equaled. The equivalent transfer function is calculated by the grid connected control loop, so the model is simplified. The battery energy storage module establishes a general mathematical model based on the charging and discharging principle. Charge and discharge are controlled through the DC/DC converter. And it is connected to the power grid after inverting and filtering. The common PQ control are selected in the inverter control mode. According to the same principle, the energy storage model is equaled. Finally, based on the traditional load model, the above load model is added to set up a new generalized integrated load model. And the actual model is replaced to build up an equivalent model. The equivalent model is compared with the actual model to verify the equivalent description ability.
基于多种新能源负荷的广义综合负荷模型及其等效描述
随着新型分布式能源的加入,需要建立新的、更精确的负荷模型。本文基于MATLAB/Simulink对光伏发电系统和蓄电池储能及其等效模型进行了建模与仿真研究。首先,建立了光伏系统的详细模型。光伏发电系统直流侧选用升压电路和MPPT控制。电网逆变器控制采用电流内环和电压外环的双闭环控制方法。考虑到低电压穿越的能力,对模型进行了改进。在上述精确模型的基础上,对模型进行了求解。由并网控制环计算等效传递函数,简化了模型。电池储能模块根据充放电原理建立通用的数学模型。充放电通过DC/DC变换器控制。经逆变滤波后接入电网。逆变控制方式选择普通PQ控制。根据同样的原理,储能模型是相等的。最后,在传统负荷模型的基础上,加入上述负荷模型,建立新的广义综合负荷模型。并将实际模型替换为等效模型。将等效模型与实际模型进行对比,验证等效描述能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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