Suppression Strategy of Ultra-Low Frequency Oscillation in Yunnan Power Grid with BESS

2019 North American Power Symposium (NAPS) Pub Date : 2019-10-01 DOI:10.1109/NAPS46351.2019.9000236

Yixuan Chen, Yuanxiao Zhao, Guangchao Geng, Q. Jiang, Wenlong Liu, Lingfang Li

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引用次数: 3

Abstract

Many problems related to power system frequency have occurred in Yunnan Province ─a province in southwestern China with high proportion of hydro-turbine generators. Yunnan Power Grid is a typical direct-current (DC) sending grid and the installed capacity of hydro-generators has accounted for more than 70% of the total capacity after asynchronous interconnection between Yunnan Power Grid and China Southern Power Grid in 2016. But the high hydropower proportion of Yunnan Power Grid makes ultra-low frequency oscillation (ULFO) more prone to occur. Battery Energy Storage System (BESS) has broad application prospects in frequency regulation. Aiming at the ULFO problem caused by AGC daily operation, a coordinated AGC strategy based on BESS is proposed. It is able to eliminate ULFO caused by AGC action by ramping the AGC signal assigned to the units and self-adaptive action of BESS with a small energy storage capacity once the system is judged to be at risk of oscillation. The effectiveness of the proposed method is verified using real-world data from Yunnan Power Grid in China based on MATLAB\SINMULINK.

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BESS对云南电网超低频振荡的抑制策略

云南省是中国西南地区水轮发电机占比较高的省份，在电力系统频率方面出现了许多问题。云南电网是典型的直流送电电网，2016年云南电网与南方电网异步并网后，水轮发电机组装机容量已占总装机容量的70%以上。但云南电网的高水电比例使得超低频振荡(ULFO)更容易发生。电池储能系统(BESS)在频率调节方面具有广阔的应用前景。针对AGC日常运行造成的超飞问题，提出了一种基于BESS的AGC协调策略。该方法通过对分配给机组的AGC信号进行爬坡，并在判断系统有振荡危险时，采用储能容量较小的BESS进行自适应动作，消除由AGC作用引起的超原状。基于MATLAB\SINMULINK，利用云南电网的实际数据验证了该方法的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 North American Power Symposium (NAPS)

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