具有自主电网同步与弱网稳定运行能力的双馈风电机组控制方法

发布时间：2018-01-14 17:10

本文关键词：具有自主电网同步与弱网稳定运行能力的双馈风电机组控制方法　出处：《中国电机工程学报》2017年02期 　论文类型：期刊论文

【摘要】：随着风电的高比例并网以及大型风电机组的分散接入,电网对风电不再具备强电气支撑作用,进而引发一系列并网稳定问题,如谐波振荡、次同步振荡和低频振荡等,这是由于风电变流器所采用的电流矢量解耦控制需要电网提供强电压支撑才能稳定控制电流所致,弱网下难以稳定。此外,风电并入弱网还需具备一定的自主组网与电网支撑能力,如自主惯量响应等。为此,该文围绕弱网稳定运行与自主电网同步两个核心问题提出了一种双馈风电机组的新型控制方法。具体地,机侧变流器采用基于转子磁链自定向的虚拟同步控制方法;对网侧变流器提出一种新型的惯性同步控制方法,依据动力学系统相似性原理,利用直流母线电压固有动态直接实现网侧变流器的无锁相环电网同步控制,该方法较虚拟同步控制模型阶数更低且更易稳定。经以上控制后,双馈风电机组的定子侧和转子侧外特性分别等效为2台同步机。在PSCAD/EMTDC仿真软件中构建2MW双馈风电机组暂态模型,详细分析了该控制下双馈风电机组的启动、柔性并网过程、自主惯量响应以及最大风能捕获等相关特性,仿真结果表明提出的控制方法具有较好的弱网稳定运行与发电特性。
[Abstract]:With distributed access to high proportion of wind power grid and large wind turbines, wind power grid to no longer have the strong electrical support function, which causes a series of problems such as grid stability, harmonic oscillation, subsynchronous oscillation and low frequency oscillation, this is because the current converter adopts vector decoupling control needs to provide power system stability control the current voltage caused by the strong support of wind power, the weak network is not stable. In addition, wind power into the weak network also has certain independent networking and network support capabilities, such as autonomous inertia response. Therefore, this paper focuses on the weak network stable operation and independent power grid synchronization of two core problems presented a novel control method doubly fed wind turbine. Specifically, machine side converter based on virtual synchronous control method of rotor flux orientation based on self synchronous control method; put forward a new inertia on the grid side converter, according to According to the similarity principle of dynamic system, direct implementation of grid side converter without phase locked loop for network synchronization control using dynamic DC bus voltage inherent, the method is virtual synchronization control model order is lower and more stable. The above control, stator side and rotor side of DFIG characteristics are equivalent to 2 units synchronous machine. To construct 2MW DFIG transient model in PSCAD/EMTDC simulation software, a detailed analysis of the control of double fed wind turbine startup, flexible grid connection process, independent of inertia response and maximum wind energy capture and other relevant characteristics. The simulation results show that the proposed control method has good stability and power characteristics of weak network.

【作者单位】：上海交通大学电子信息与电气工程学院风力发电研究中心;东华大学信息科学与技术学院;
【基金】：台达环境与教育基金会《电力子科发展计划》(DREM2016005)~~
【分类号】：TM614
【正文快照】： 0引言随着风电的高比例并网以及大型风电机组的分散接入,电网对风电不再具备强电气支撑能力,进而引发一系列新型的并网稳定问题,如风场经串补线路并网产生的次同步振荡[1],风场并弱网产生的谐波振荡[2],风场经HVDC并网产生的次同步振荡[3]等。该类问题的产生主要源于风电机组

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