市电和光伏联合供电运行的控制策略研究

Research on the Control Strategy of the Operation of the Combined Power Supply of City Electricity and Photoelectricity

针对传统比例复数积分控制只能应用于三相正交坐标系而无法应用于单相坐标系的问题,提出了将广义二阶比例复数积分控制引入到单相并网逆变器的控制中.次单相并网逆变器与电网电压前馈控制和重复控制构成复合控制策略,对市电和光伏联合供电运行系统的能量控制起到较好控制效果.在复合控制策略下,市电和光伏联合供电运行系统可以优先使用光伏,光伏发电量不足时再由市电补足差额部分.这种方法既保证负载用电不断,又能充分利用清洁能源,且光伏侧不会向市电侧馈电,避免对大电网产生谐波污染.本文所建立的基于TMS320F28335 DSP芯片的在MATLAB仿真中证明了实现了光伏优先、市电候补来供电的可行性.

To solve the problem that the traditional proportional complex integral control can only be applied to the three-phase orthogonal coordinate system but not to the single-phase coordinate system,the generalized second-order proportional complex integral control is introduced into the control of single-phase grid-connected inverter.The secondary single-phase grid-connected inverter,power grid voltage feedforward control and repetitive control constitute a composite control strategy,which plays a better control effect on the energy control of the combined power supply system of municipal power and photoelectric power.Under the composite control strategy,the combined power supply system of the municipal power and the photoelectric power can have the priority of using the photoelectric power,and when the photoelectric power generation is insufficient,the municipal power can make up the difference.This method not only ensures continuous load power consumption,but also makes full use of clean energy,and the photoelectric side will not feed to the municipal side,to avoid harmonic pollution to the large power grid.Based on TMS320F28335 DSP chip,the feasibility of realizing optoelectronic priority and alternate power supply is proved in MATLAB simulation.