复杂电网工况下基于CDSOGI-SPLL的电网电压同步方法

发布时间：2018-02-20 01:21

  本文关键词： 锁相环 相序解耦控制器 二阶广义积分器 谐波抑制　出处：《电力系统自动化》2017年16期 　论文类型：期刊论文

【摘要】：传统锁相环技术在三相电网电压含有直流分量、发生不对称故障以及严重畸变条件下,其检测精度受到直流分量、负序分量及谐波分量的干扰,将不能准确跟踪电网电压频率和相位。针对这一问题,提出一种将相序解耦谐振(SDR)控制器和改进的级联双二阶广义积分器软件锁相环(CDSOGI-SPLL)相结合的锁相方法。该方法首先利用SDR控制器将正负序分量进行分离,然后引入改进的级联双二阶广义积分器(CDSOGI)对正负序分量进行二次分离和谐波抑制,并消除直流分量对CDSOGI输出正交信号的影响。仿真和实验结果表明,在三相电网电压含有直流分量、不平衡和严重畸变情况下,所述方法可以实现电网电压同步信息的准确采集。
[Abstract]:Under the condition that the voltage of three-phase power system contains DC component, the asymmetry fault and the serious distortion, the detection accuracy of the traditional PLL technique is disturbed by DC component, negative sequence component and harmonic component. Will not be able to accurately track the voltage frequency and phase of the grid. A phase locking method combining the phase sequence decoupling resonance (SDR) controller and the improved cascade double second order generalized integrator software phase locked loop (CDSOGI-SPLL) is proposed. The SDR controller is used to separate the positive and negative sequence components. Then an improved cascade double second order generalized integrator (CDSOGI) is introduced to carry out the secondary separation and harmonic suppression of the positive and negative sequence components, and to eliminate the influence of DC component on the output orthogonal signals of CDSOGI. The simulation and experimental results show that, Under the condition of DC component, unbalance and serious distortion of three-phase network voltage, the method can accurately collect the synchronous information of power grid voltage.
【作者单位】： 哈尔滨工业大学电气工程及自动化学院;大连理工大学电气工程学院;
【基金】：国家自然科学基金资助项目(51377013);国家自然科学基金青年基金资助项目(51407023)~~
【分类号】：TM761.12
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本文编号：1518429