离网型风光混合能源发电系统的仿真研究

Simulation of Grid-off Wind /Solar Hybrid Energy Power System

风光混合能源发电系统是为了弥补独立的风力发电系统和光伏发电系统不足而设计的独立发电系统,可以充分利用风能和太阳能资源,具有无污染供电质量好等优点。为了提高风光互补发电系统的利用率,满足负载的供电要求,必须对系统能量进行有效管理。风光双通道的输出电压具有共直流母线的特点,如何配置风力发电机、光伏电池板和蓄电池来满足负载需求,为使风光混合能源得到充分利用,采用MATLAB/Simulink平台环境,建立风力机、发电机、光伏阵列、Buck变换器、双闭环控制器等子系统模型;用内环电流、外环电压控制的双闭环PWM技术,分别对风光混合能源发电系统的输出电压进行控制,对比分析无储能元件的系统性能;在风能和太阳能能量交替出现情况下,对风光混合能源发电系统进行性能研究,分析了随机性扰动输入下系统的实际模态与性能仿真,结果表明了系统模型和控制策略的正确性,为指导实际工程优化提供了理论依据。

Grid-off wind/solar hybrid energy power system is independent power system which designs for the lack of stand-alone wind power systems and photovoltaic power generation system.This system can make full use of wind and solar energy resources,and has advantages of non-pollution and good quality of electrical supply.In order to improve energy utilization economics efficiency,and satisfy the electrical supply demand,the energy of wind/solar hybrid power system must be controlled effectively.Wind/solar dual channel output voltage has the characteristics of common DC bus,so how to configure the wind turbines,photovoltaic panels and batteries to meet the load demand is an important issue.To make the wind/solar hybrid energy power system critical to be fully utilized,under the MATLAB/Simulink environment,we established wind turbine generators,photovoltaic array,buck converter,and double closed loop controller subsystem model.The inner current and outer voltage control of double-loop PWM technology is used to control the wind/solar hybrid energy power system output voltage.Comparative analyses of system performance were carried out with or without energy storage components.The paper discussed the wind/solar hybrid of the energy mix in power generation performance in wind and solar energy alternating case,analyzed the randomness disturbance input the system modal and performance.Simulation results show that the system model and control strategy are correct.