Suppressing Intermittent Subsynchronous Oscillation via Subsynchronous Modulation of Reactive Current
Suppressing Intermittent Subsynchronous Oscillation via Subsynchronous Modulation of Reactive Current
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DOI：
10.1109/tpwrd.2015.2436063
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发表时间：
2015-06
影响因子：
4.4
通讯作者：
Jian Zhang;Xiangning Xiao;Peng Zhang;Chao Luo;Yunsheng Wu;Jingjing Lu;Lingyu Ren
中科院分区：
文献类型：
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作者：
Jian Zhang;Xiangning Xiao;Peng Zhang;Chao Luo;Yunsheng Wu;Jingjing Lu;Lingyu Ren
最近，一种新的振荡现象-间歇性次同步振荡（ISSO）-已被观察到在一个大型互联电网。ISSO不会导致振荡不稳定性，而是会导致累积疲劳损伤并缩短发电机的轴寿命。现有的基于相位补偿的阻尼技术被发现在减轻这些类型的振荡方面是有限的。为了缓解ISSO，建立了一种次同步无功电流调制（SMRC）方法，并在发电机端的电压源换流器（VSC）中实施。为了选择VSC的控制参数，分析了SMRC对系统阻尼的贡献。SMRC控制器已在配备新开发的速度传感器模块的实时闭环仿真平台上进行了原型设计和广泛测试，该速度传感器模块用于将实时数字仿真器与转速采集板精确连接。对VSC的输入输出特性进行了大量的实验，以测试和验证阻尼电流产生模块。有效阻尼区域是从测试观察到的精细调整的VSC控制器的参数，以适应各种系统的操作条件，从而在公共的最佳阻尼区域。实时仿真、现场调试和统计数据表明，SMRC能够有效抑制发电厂的ISSO和次同步振荡。
Recently, a new oscillation phenomenon-intermittent subsynchronous oscillation (ISSO)-has been observed in a large interconnected power grid. Rather than leading to oscillatory instability, ISSO causes cumulative fatigue damage and reduces the shaft life of the generator. The existing phase-compensation-based damping technologies are found to be limited in mitigating these types of oscillations. To mitigate ISSO, a subsynchronous modulation of reactive current (SMRC) approach is established and implemented in the voltage-source converters (VSCs) at the generator terminals. The contribution of SMRC to system damping has been analyzed in order to select control parameters for the VSC. The SMRC controller has been prototyped and extensively tested on a real-time closed-loop simulation platform equipped with a newly developed speed sensor module for precisely interfacing the real-time digital simulator with the rotating speed-acquisition board. Extensive experiments on the input and output characteristics of the VSC have been carried out to test and validate the damping current generating module. The effective damping areas are obtained from test observations to fine tune the parameters of the VSC controller for adapting to various system operating conditions, resulting in the common optimal damping region. Real-time simulations, onsite commissioning, and statistics have demonstrated the ability of the SMRC to mitigate ISSO and subsynchronous oscillation in power plants.