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A PID SRF‐PLL based algorithm for positive‐sequence synchrophasor measurements
International Transactions on Electrical Energy Systems ( IF 2.3 ) Pub Date : 2021-01-03 , DOI: 10.1002/2050-7038.12777
Gabriel U. Carvalho 1 , Gustavo W. Denardin 1 , Rafael Cardoso 1 , Flavio L. Grando 2
Affiliation  

Most of the proposed algorithms for synchrophasor estimation are based on the Discrete Fourier Transform (DFT). However, this technique has well‐known limitations, such as the leakage effect. Alternatively, this paper presents a positive‐sequence synchrophasor measurement algorithm based on a Synchronous Reference Frame Phase‐Locked Loop (SRF‐PLL). The algorithm is modular and consists of four stages. The first one is the abc‐dq transform that, with the aid of the second stage, a Finite Impulse Response (FIR) provides the positive‐sequence of the grid voltages. The filter also helps to improve the signal‐to‐noise ratio. This filter class was chosen due to its characteristic of linear phase and constant group delay to avoid unwanted phase distortions at the measurements. The third stage is an SRF‐PLL based on a PID controller that estimates the amplitude and phase of the grid voltage's positive‐sequence component and the grid frequency. By assessing the dynamic condition tests, it was observed that the PLL could not comply with all the IEEE standard requirements. Therefore, a fourth stage was included to calculate the frequency, and Rate of Change of Frequency (ROCOF) based on the estimated positive‐sequence phase. Experimental results obtained with a test platform shown that the proposed algorithm complies with all IEEE C37.118.1‐2011 and C37.118.1a‐2014 standard requirements.

中文翻译:

基于PID SRF-PLL的正序同步相量测量算法

提出的大多数用于同步相量估计的算法都是基于离散傅立叶变换(DFT)。但是,该技术具有众所周知的局限性,例如泄漏效应。另外,本文提出了一种基于同步参考帧锁相环(SRF-PLL)的正序同步相量测量算法。该算法是模块化的,包括四个阶段。第一个是abc-dq变换,在第二阶段的帮助下,有限脉冲响应(FIR)提供了电网电压的正序。滤波器还有助于提高信噪比。选择该滤波器类别是因为其具有线性相位和恒定的群延迟特性,以避免测量时出现不必要的相位失真。第三阶段是基于PID控制器的SRF-PLL,该控制器估计电网电压正序分量的振幅和相位以及电网频率。通过评估动态条件测试,可以观察到PLL不能满足所有IEEE标准要求。因此,包括了第四阶段以计算频率,并基于估计的正序相位计算频率变化率(ROCOF)。在测试平台上获得的实验结果表明,该算法符合所有IEEE C37.118.1-2011和C37.118.1a-2014标准要求。包括第四阶段以计算频率,并基于估计的正序阶段计算频率变化率(ROCOF)。在测试平台上获得的实验结果表明,该算法符合所有IEEE C37.118.1-2011和C37.118.1a-2014标准要求。包括第四阶段以计算频率,并基于估计的正序阶段计算频率变化率(ROCOF)。在测试平台上获得的实验结果表明,该算法符合所有IEEE C37.118.1-2011和C37.118.1a-2014标准要求。
更新日期:2021-03-02
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