柔性接地補償電流離散域矢量控制策略研究
2023年電子技術應用第4期
胡致寧1,李先允1,趙志宏2
(1.南京工程學院 電力學院, 江蘇 南京 211167;2.南京理工大學 自動化學院, 江蘇 南京 210096)
摘要: 柔性接地通過電力電子變流器補償單相接地故障電流的有功和諧波分量,實現對故障電流的全補償,從而有利于接地點電弧的快速熄滅,因此柔性接地在配電網具有重要的應用前景。針對柔性接地有功與諧波電流控制,通過建立電力電子變流器的離散模型,直接考慮數字控制的一拍延時,設計了離散矢量電流控制器,在靜止坐標系實現了對交流信號的無靜差調節。針對所提電流控制器,通過離散域根軌跡分析,提出了臨界阻尼參數設計方法,優化暫態響應避免了過補償。仿真結果驗證了所提控制器與設計方法的有效性。
中圖分類號:TM464
文獻標志碼:A
DOI: 10.16157/j.issn.0258-7998.223560
中文引用格式: 胡致寧,李先允,趙志宏. 柔性接地補償電流離散域矢量控制策略研究[J]. 電子技術應用,2023,49(4):105-110.
英文引用格式: Hu Zhining,Li Xianyun,Zhao Zhihong. Study of the discrete vector controller for current regulation of flexible grounding compensation method[J]. Application of Electronic Technique,2023,49(4):105-110.
文獻標志碼:A
DOI: 10.16157/j.issn.0258-7998.223560
中文引用格式: 胡致寧,李先允,趙志宏. 柔性接地補償電流離散域矢量控制策略研究[J]. 電子技術應用,2023,49(4):105-110.
英文引用格式: Hu Zhining,Li Xianyun,Zhao Zhihong. Study of the discrete vector controller for current regulation of flexible grounding compensation method[J]. Application of Electronic Technique,2023,49(4):105-110.
Study of the discrete vector controller for current regulation of flexible grounding compensation method
Hu Zhining1,Li Xianyun1,Zhao Zhihong2
(1.School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China; 2.School of Automation, Nanjing University of Science and Technology, Nanjing 210096, China)
Abstract: The active and high-frequency harmonic current are compensated by introducing power electronics converter of the flexible grounding, which achieves full compensation of the single-phase to earth current to achieve a fast arc extinction. Thus, the flexible grounding is promising in the distribution network. Regarding the active and harmonic current control, this paper proposes to design the controller in the discrete-time domain based on the discrete model of the plant, which deals with the one-sample delay directly. The discrete complex current controller is developed which achieves AC current regulation in the stationary reference frame without steady-state error. With regard to the proposed controller, a tuning method based on critical damping is proposed based on the discrete root locus analysis, which avoids overshoot and optimizes the settling time. The simulation results have verified the effectiveness of the proposed controller and the tuning method.
Key words : flexible grounding;current compensation;discrete complex controller;critical damping
0 引言
隨著配電網規模的不斷擴大、電力電子變流設備以及電纜線路的大量使用,系統發生單相接地故障時,流過接地點電流除了基波容性電流外,還包含大量的有功和諧波電流[。現有的自動跟蹤補償消弧線圈只能補償基波無功電流,對阻性和諧波電流無能為力,導致故障點殘余電流仍然處于較大水平,電弧難以熄滅,容易引發弧光過電壓,造成設備絕緣損壞。
柔性接地在傳統消弧線圈接地的基礎上,通過增加電力電子變流器,補償故障電流的有功和諧波分量,實現了對接地電流的完全補償。因此,無需對已有消弧線圈及其調檔控制策略進行改造,難點和關鍵點是變流器的電流跟蹤控制策略,要求能夠快速跟蹤參考電流,抑制暫態調節過程發生電流超調,從而避免過補償并且降低電弧燃燒的可能性。
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作者信息:
胡致寧1,李先允1,趙志宏2
(1.南京工程學院 電力學院, 江蘇 南京 211167;2.南京理工大學 自動化學院, 江蘇 南京 210096)
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