电网不平衡下双同步坐标系锁相环方法研究

发布时间：2018-06-23 14:27

本文选题：锁相环(PLL) + 正序信号检测　；参考：《电气应用》2014年22期

【摘要】：针对PWM整流器或光伏逆变器等应用中,在电网不平衡条件下对电网电压基波正序分量的检测存在较大的误差。提出了采用双同步坐标系锁相环(DSRF-PLL)方案,可以在电网电压不平衡的情况下消除传统的同步坐标系锁相环系统存在的误差。通过将电网电压矢量的正序和负序分量转化到DSRF中,形成一个解耦网络可以完全分离正序和负序分量。由此得到的DSRF-PLL即使在电网不平衡或者频率变化的情况下也可以快速、准确地检测正序电压的相位,同时可以计算得到正序、负序电压矢量分量的幅值和频率。对所提出的锁相环方案进行了详细的理论介绍和方案设计,并且实验测试表明DSRF-PLL在电网不平衡条件下具有较好的锁相能力,验证了该方案的有效性,对工程应用具有一定的指导意义。
[Abstract]:In the application of PWM rectifier or photovoltaic inverter, there is a large error in detecting the fundamental sequence component of the fundamental voltage under the condition of unbalanced power grid. A dual-synchronous coordinate phase-locked loop (DSRF-PLL) scheme is proposed, which can eliminate the errors in the traditional synchronous coordinate PLL system when the voltage of the power system is unbalanced. By transforming the positive and negative sequence components of the voltage vector into DSRF, a decoupling network can completely separate the positive sequence and negative sequence components. The obtained DSRF-PLL can detect the phase of the positive sequence voltage quickly and accurately even when the power network is unbalanced or frequency change. At the same time, the amplitude and frequency of the positive sequence and negative sequence voltage vector components can be calculated. The theory and scheme design of the proposed PLL scheme are introduced in detail, and the experimental results show that DSRF-PLL has a good phase-locking capability under unbalanced power grid conditions, which verifies the effectiveness of the proposed scheme. It has certain guiding significance for engineering application.
【作者单位】：包头职业技术学院电气工程系;
【分类号】：TM73

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