静态并网型分布式发电模拟装置的研究与实现

实验室条件下的测试分析是研究光伏、风电等分布式发电并网运行规律的重要环节。研究并实现了基于全数字控制变流电路的分布式电源静态模拟装置。装置以有源DC/AC逆变器为核心,实现了其功率变换电路;可同时调节注入电网的有功功率和无功功率,以简化型特定消谐脉宽调制方法(simplified selective harmonic elimination PWM—SSHEPWM)和电流矢量跟踪控制为基础实现了完整的控制策略;可在较宽范围内快速准确地调节并网功率,并避免对电网的谐波污染。介绍了装置的系统结构与总体思路,分析了SSHEPWM原理,推导了系统动态模型,提供了电流矢量跟踪控制的实现流程。实验测试表明,该装置可灵活有效地模拟分布式电源的输出特性,能满足相关研究需要。

Study and Implement for Simulation Devices of Static Grid-Connected Distributed Generation

The test and analysis in laboratory is an important part of the research on distributed generation such as photovoltaic and wind power generator. A static simulation device of distributed generation based on converter of full digital control is studied and implemented in the paper. In the simulator, power conversion circuit is mainly realized by active DC/AC inverter, which can adjust active power as well as reactive power injected into the grid at the same time. Complete control strategy is composed of Simplified Selective Harmonic Elimination PWM method (SSHEPWM) and current vector tracking control, which can rapidly and accurately regulate real-time power in a wide range and avoid harmonic pollution to power system. This paper introduces system structure and general idea of the simulator, analyzes the principle of SSHEPWM, deduces system dynamic model and provides the implementation process of the current vector tracking control. Experimental results show that the simulator can effectively simulate the output characteristics of distributed power supply and meet the needs of the related research.