张璐,苏海滨,高孟泽
摘 要: 随着我国电力需求的持续增加,微电网不断地接入电力系统。微电网将分布式电源、负荷、储能装置、能量变换设施和控制装置集成一个整体进行综合控制。由于其规模的不断扩大,其运行难度也在不断增加,难以满足用户越来越高的安全性和可靠性要求。提出了一种基于PSO算法的逆变器接口分布式电源控制方法,通过优化逆变器输出控制器参数,能够有效抑制存在于微电网中的电压、频率、操作模式转换等干扰。仿真实验验证了该智能控制方法的正确性与有效性。
关键词: 智能控制; PSO; 逆变器接口; 参数优化
中图分类号: TN710?34 文献标识码: A 文章编号: 1004?373X(2014)23?0136?03
PSO?based optimization method of output?controller for inverter interface power supply
ZHANG Lu, SU Hai?bin, GAO Meng?ze
(Electric Power School, North China University of Water Resources and Electric Power, Zhengzhou 450045, China)
Abstract: With the increasing demand of electricity, more and more micro?grids access to power systems. In micro?grid, distributed power, load, energy storage facilities, energy conversion facilities and control devices are integrated into an integral whole to make comprehensive control. Because its size is expanding and the operation difficulty is increasing, it is difficult to meet users′ increasing requirements of high safety and reliability. A PSO algorithm based control method for the distributed power supply of inverter interface is proposed in this paper. The interference of voltage, frequency, operating mode conversion existing in micro?grid can be efficiently suppressed by optimizing the parameters of the inverter output?controller. The simulation results show the correctness and effectiveness of the intelligent control method.
Keywords: intelligent control; PSO; inverter interface; parameter optimization
0 引 言
近年来,随着电力电子技术的不断发展,大多数分布式电源(DG)通过逆变器接口部署在电力系统中。它能够灵活地在不同用电时段对大电网功率进行削峰填谷,并提高电能质量。
如图1所示,往往在一个微电网中包含有多个DG。一般情况下,微电网和主电网并网运行,依靠主网支撑的微电网可以快速调整电压和频率[1]。当主网某馈线发生故障,微电网脱离主网作为不间断电源孤岛运行。孤岛模式下,下垂控制器为了匹配负载的变化和各DG之间功率的协调不断地调整母线的电压和频率[2?3]。由于微电网DG的小惯性特点,大的扰动容易引起电能质量下降,甚至微电网的崩溃解裂。为了保障孤岛模式下微电网的电能质量,需要一种快速、智能、有效的逆变器接口DG控制方法[4?5]。……