低压微网的解耦控制方法研究-电气工程专业论文.docxVIP

摘要 摘 要 - - I - 摘 要 微网技术为分布式电源大规模并网应用提供了有效技术途径，微网在实现分布 式能源合理利用的同时，作为一个智能可控单元接受电网调度，与大电网间进行能 量交换，为大电网安全可靠运行提供了有力支撑。微网多样的运行方式与高质量的 电力服务离不开灵活与稳定的控制系统，其中微电源输出有功功率和无功功率的解 耦控制问题亟待研究。本文围绕低压微网的解耦控制方法展开了研究。首先全面地 介绍了该课题的研究背景及其意义、微网技术概况、国内外微网发展现状、微网中 解耦控制的研究现状；介绍了应用于微网的微电源并网逆变器结构，并对其控制系 统进行了设计，仿真分析了其工作过程和控制性能；在此基础上，针对微网线路功 率耦合问题，提出了一种基于相对增益分析的目标函数对角化微网功率解耦控制方 法，量化了微网功率控制通道耦合度，实现了微网线路有功功率和无功功率的解耦 控制；针对孤岛运行微网中存在的功率耦合问题，提出了一种微网稳压解耦控制方 法，实现了功率解耦，并保证了其电压稳定。本文方法实现了微网线路中的有功功 率、无功功率的独立、精确控制，增强了微网功率的可控性，有利于微网安全、稳 定、优质运行。 关键词：微网；功率解耦；相对增益分析；虚拟电阻；稳压控制 华北电力大学硕士学位论文 华北电力大学硕士学位论文 - - II - Abstract The technology of Microgrid is an efficient and feasible way for the utilization of distributed energy. Being controlled by the power grid as an intelligent unit, microgrid can provide high quality power and strong support for the safe and reliable operation of the power grid and realizes the reasonable use of distributed energy. Without thorough and stable control system, microgrid can’t sustain flexible operation modes and high quality power supply services, and the independent active and reactive power control of microsource is a burning question. In this paper, the decoupling control method for low voltage microgrid was studied. The research background and significance, an overview of microgrid and its domestic and abroad development situation, the study status of the decoupling control of microgrid were comprehensively introduced; The control system of inverter in microgrid was designed; The objective function diagonalization decoupling control for microgrid power based on relative gain analysis was proposed for the coupling problem in microgrid, which quantized the control channel coupling degree, and realized the active power and reactive power independent control; A voltage stabilization decoupling control method for microgrid was proposed for the power coupling problem in island microgrid, realizing the power decoupling in microgrid and ensuring its voltage stabilization. The proposed meth