論文總結了作者在超導儲能（SMES）系統(tǒng)中電流源型變流器方面的研究工作。分析了作為SMES功率調節(jié)器的電流源型變流器的特點，介紹了所采用的兩種PWM 開關策略：優(yōu)化PWM 和直接電流PWM。將基于電流源型變流器的并聯SMES 系統(tǒng)應用于提高電網的穩(wěn)定性：提出一種SMES 裝置在動態(tài)電力系統(tǒng)中的非線性魯棒控制策略，并研制了相應的非線性魯棒控制器；數字仿真及動模實驗結果表明：采用非線性魯棒控制的SMES 裝置可顯著改善輸電系統(tǒng)動態(tài)品質和暫態(tài)穩(wěn)定性。在改善用戶的電能質量方面：研制了一套三端口式的采用電流源型變流器的SMES 動態(tài)電壓補償器（DVR）；建立了系統(tǒng)的完整電路模型，并在此基礎上對緩沖吸收電路的工作過程進行了詳細的仿真和實驗研究；提出了一種準穩(wěn)態(tài)的動態(tài)電壓補償算法；運行試驗表明，系統(tǒng)具有良好的穩(wěn)態(tài)工作和動態(tài)補償性能。
Abstract: This paper reviews the author’s research work on the current source converter (CSC) in SMES units. The characteristics of CSC are analyzed and two kinds of PWM strategies used (the optimum PWM and the current vector PWM) are described. CSC-based SMES units can be applied for improving the stability of power systems. As a result of research, the equations of the non-linear robust control law of power systems with the SMES were obtained and corresponding controller was developed. The simulation and experimental results show that the SMES unit with the non-linear robust controller can significantly improve the transient stability of power systems. SMES units can also be used to improve the customer power quality. A line-interactive SMES DVR with CSC was developed. A complete circuit model of the system including the stray inductances and the snubber circuits of the switching devices was built, and simulations and experiments were performed to investigate voltage surges of the devices. A quasi-steady-state algorithm for compensating voltage sags was developed, and the SMES unit under control of the algorithm works well under both normal and voltage sag compensation conditions.
關鍵詞﹕電流型變流器；超導儲能；電力系統(tǒng)暫態(tài)穩(wěn)定性；動態(tài)電壓補償；緩沖吸收電路
Keywords: CSC, SMES, transient stability of power systems, DVR, snubber circuits