5 kW单相非隔离逆变器的研制

针对采用传统PI和比例谐振PR控制的并网逆变器对电网干扰信号的抑制能力较弱问题，提出了一种基于准PR控制策略的单相并网逆变器控制方案，并针对自行研制的一种可大规模用于家庭供电的体积小、成本低的单相非隔离5 kW逆变器进行了仿真研究和并网实验。从硬件和软件两方面阐述了逆变器的设计原理;采用Matlab软件中的S-Function函数进行了仿真分析，控制策略为准PR控制，将其与传统的PI和PR控制器进行了对比，并在仿真基础上用实验样机进行了实验验证。研究结果表明，所提出的准PR控制策略在消除稳态误差、提高网侧电流品质和抗电网干扰等方面，相较于PI和PR控制具有很大的优越性，不仅可以更好地实现无静差控制，且具有可扩展性。凭借准PR控制器的无静差特性，单相非隔离5 kW逆变器在家用供电系统中将具有广阔的应用前景。

Development of 5 kW single-phase non-isolated inverter

Aiming at the weaker suppression ability of grid-connected inverters with traditional PI and proportional resonance PR control, a single-phase grid-connected inverter control scheme based on quasi-PR control strategy is proposed. A small-scale, low-cost single-phase non-isolated 5 kW inverter that can be used for large-scale power supply at home has been simulated and connected to the grid. The design principle of the inverter is expounded from two aspects of hardware and software. The simulation analysis is carried out by using the S-Function function in Matlab software. The control strategy is based on quasi-PR control and compared with the traditional PI and PR controllers. Based on the simulation, the experimental verification is carried out with an experimental prototype. The research results show that the proposed quasi-PR control strategy has great advantages compared with PI and PR control in eliminating steady-state error, improving grid-side current quality and resisting grid interference. Not only can it be better to achieve no static control, but also has scalability. With the static-free characteristics of the quasi-PR controller, the single-phase non-isolated 5 kW inverter will have broad application prospects in the home power supply system.