不对称电网电压下光伏并网逆变器控制策略研究

发布时间：2018-03-09 23:01

本文选题：光伏并网逆变器　切入点：不对称电网电压　出处：《太阳能学报》2017年10期 　论文类型：期刊论文

【摘要】：光伏并网逆变器直接功率控制系统的两相静止坐标系模型无需旋转变换就可以实现无锁相环运行。但系统相关变量为交流量,采用比例积分(PI)控制不能实现无静差调节。并且在不对称电网电压的情况下,不能同时实现系统输出功率和网测电流质量的控制。针对上述问题提出一种协调自抗扰直接功率控制的设计方法,无需对网侧电流的正负序分量和电网电压负序分量进行提取,能够简化系统控制结构,提高鲁棒性。其中,为了避免电网频率变化影响,电网电压的正序分量分离采用自适应陷波滤波器技术。为了网侧电流和瞬时功率的协调控制,在自抗扰直接功率控制策略基础上,功率给定值采用加权的方法来获得。最后借助Matlab/Simulink对该文所提出的策略进行仿真,验证所提控制算法的有效性和可行性。
[Abstract]:The two-phase stationary coordinate system of direct power control system of grid-connected photovoltaic inverter can run without phase-locked loop without rotation transformation. Using proportional integral PI) control can not realize the regulation of no static error, and in the case of asymmetric network voltage, The output power of the system and the quality control of the network current can not be controlled simultaneously. In view of the above problems, a design method of coordinated ADRC direct power control is proposed, without the need to extract the positive and negative sequence components of the grid side current and the negative sequence component of the grid voltage. It can simplify the control structure and improve robustness. In order to avoid the influence of frequency variation, adaptive notch filter technique is used to separate the positive sequence components of the grid voltage. On the basis of ADRC direct power control strategy, the given power value is obtained by weighted method. Finally, the proposed strategy is simulated by Matlab/Simulink to verify the effectiveness and feasibility of the proposed control algorithm.
【作者单位】：天津内燃机研究所;天津大学电气与自动化工程学院;
【分类号】：TM464;TM615

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