It has become a great challenge to mitigate the unstable subsynchronous control interaction (SSCI) in practical series compensated wind power systems, mainly because of the system-wide influential factors, such as the constantly changing wind speed, number of in-service wind turbines, and operating conditions. In an effort to address the challenge, this paper proposes a simple yet practical grid-side subsynchronous damping controller (GSDC), which consists of a subsynchronous damping controller (SDC) supplemented to a subsynchronous current generator (SCG). The GSDC utilizes bus voltages and line currents as feedback signals and injects currents at the subsynchronous frequency into the system to provide active damping. The parameters of the SDC and SCG can be optimized for any system facing SSCI issues. In this paper, a GSDC is developed and optimized over an EMT model of a realistic system. The proposed scheme has demonstrated its effectiveness and robustness through controller-hardware-in-the-loop tests for mitigating SSCI over a wide range of operating conditions. This paper has paved the way for the commissioning of a practical GSDC in a real-world system that has experienced unstable SSCI incidents.

中文翻译：

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缓解不稳定SSCI的网格侧次同步阻尼控制器及其硬件在环测试

在实际的串联补偿式风力发电系统中，减轻不稳定的次同步控制相互作用（SSCI）已成为一项巨大的挑战，这主要是由于系统范围内的影响因素，例如风速不断变化，在役风力涡轮机的数量，和操作条件。为了应对这一挑战，本文提出了一种简单而实用的电网侧次同步阻尼控制器（GSDC），该控制器由一个次同步阻尼控制器（SDC）补充为一个次同步电流发生器（SCG）。GSDC利用总线电压和线路电流作为反馈信号，并以次同步频率将电流注入系统以提供主动阻尼。SDC和SCG的参数可以针对面临SSCI问题的任何系统进行优化。在本文中，GSDC是根据实际系统的EMT模型开发和优化的。所提出的方案已经通过控制器硬件在环测试证明了其有效性和鲁棒性，该测试可在广泛的工作条件下缓解SSCI。本文为在经历了不稳定SSCI事件的真实系统中调试实际GSDC铺平了道路。