A Novel Passivity-Based Resonant Instability Suppression Method for Grid-Connected VSC
- PDF / 3,771,352 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 1 Downloads / 152 Views
ORIGINAL ARTICLE
A Novel Passivity‑Based Resonant Instability Suppression Method for Grid‑Connected VSC Jiancheng Zhao1 · Kai Li1 · Xiaodong Wang1 · Chuan Xie1 · Hongbing Xu1 Received: 19 June 2019 / Revised: 19 July 2020 / Accepted: 12 October 2020 © The Korean Institute of Electrical Engineers 2020
Abstract The interaction between the three-phase voltage source converters (VSCs) and the power grid may cause high-frequency resonant instable problems. Studies have indicated that the non-passivity of VSCs is the main reason that leads to the resonances. The above-mentioned passive means that the equivalent output admittance of the VSC has a positive real part. In this paper, a novel damped Smith predictor is proposed to suppress the resonant instability problem that caused by time delay. The research proved that the proposed Smith predictor can significantly improve the passivity of the VSC by reducing the width of the negative real part at the high-frequencies. Simulation and experimental results demonstrate that the proposed Smith predictor can distinctly improve the robustness of the VSC. Keywords Voltage source converters · Passivity · Stability · Time delay compensation · Smith predictor control
1 Introduction Stable operation of the grid is crucial for social and economic development. However, with the escalating amount of renewable energy power systems and other non-passive electric devices in power supply systems, the power system becomes more and more intricate. Therefore, it is a great challenge to ensure the stable operation of the grid. Voltage source converters (VSC) have been widely used in renewable energy power systems, including energy storage, photovoltaic, wind power, motor driving systems, and so on [1–3]. The renewable energy power system that contains VSCs is different from traditional grid systems, which generate * Jiancheng Zhao [email protected]; [email protected] Kai Li [email protected] Xiaodong Wang [email protected] Chuan Xie [email protected] Hongbing Xu [email protected] 1
School of Automation Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Avenue, West Hi‑Tech Zone, Chengdu 611731, Sichuan, China
electricity by permanent magnet synchronous motors and consume electricity by passive loads. The renewable energy system contains various non-passive devices and nonlinear loads, which would cause the high-frequency resonance of the power grid [4]. Several resonant instable problems in the power systems that contain VSCs have occurred in many countries and attracted the attention of scholars, such as, the first detected resonant event in the single-phase traction grid was reported in Switzerland [5]. The resonance problem can be considered as the stability problem in terms of control [6]. The traditional frequencydomain-based stability analytical method needs to build the accurate model of grid and VSC, where the grid model is generally simplified as ideal voltage source cascades inductor [7]. However, the grid with long transmissi
Data Loading...
