虚拟发电机研究剖析.doc

摘 要 分布式发电的快速发展使其在电网中的比重日益变大，增加了分布式电源安全、稳定并网的难度。消除分布式电源接入电网时对电力系统的不利影响，要求其在提供电能的同时也具有相应的电压频率和幅值支撑能力。虚拟同步发电机技术作为一种能够使分布式电源主动参与电网功率调节的控制方案，受到了广泛关注。虚拟同步发电机的根本在于对同步发电机特性的模拟，即一次调频特性、一次调压特性与惯性。本文先阐述对分布式发电与虚拟同步发电机的认识，并简要介绍同步发电机的工作原理。接着分析了虚拟同步发电机的设计原理和现有虚拟同步发电机的技术方案。最后提出对拓扑结构和控制策略的设计，用MATLAB/SIMULINK搭建虚拟同步发电机的仿真模型，并进行仿真和对仿真结果的分析。虚拟同步发电机技术的应用，确实提高了电力系统的稳定性，实现了频率和电压的无差控制。虚拟同步发电机技术很好的改善了电网的稳定性，具有深远的发展前景。 关键词：电力系统；虚拟同步发电机；一次调压；一次调频；虚拟惯性 ABSTRACT In this paper, Growing proportion of distributed power in power grid because of its rapid development, increase the difficulty of distributed power safety and steadily parallel in power grid. In order to eliminate distributed power grid on the harmful effects of electric power system, the distributed generation also must have its corresponding voltage amplitude and frequency support. Virtual synchronous generation(VSG) attracted much attention as a kind of control plan can make the active participation of distributed power grid power regulation. The most important of VSG is the simulation of the synchronous generator characteristics. These characteristics are frequency regulation, voltage regulation and virtual inertia. This paper first expounds the understanding of distributed generation and VSG, and make a brief introduction to the principle of synchronous generator. Then analysis the principle of VSG and the existing scheme of VSG. Finally puts forward the topological structure and control strategy design. Set up using MATLAB/SIMULINK simulation model of VSG, and do the simulation and analysis of results. The application of the VSG technology did raise the stability of power system and realize the no difference frequency and voltage control. The VSG technology has greatly improved the stability of power grid. The VSG has profound development prospects. Key words： electric power system；virtual synchronous generator；voltage regulation；frequency regulation；virtual inertia 目 录 摘要 I ABSTRACT II 1