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柔性接地補(bǔ)償電流離散域矢量控制策略研究
2023年電子技術(shù)應(yīng)用第4期
胡致寧1,李先允1,趙志宏2
(1.南京工程學(xué)院 電力學(xué)院, 江蘇 南京 211167;2.南京理工大學(xué) 自動(dòng)化學(xué)院, 江蘇 南京 210096)
摘要: 柔性接地通過(guò)電力電子變流器補(bǔ)償單相接地故障電流的有功和諧波分量,實(shí)現(xiàn)對(duì)故障電流的全補(bǔ)償,從而有利于接地點(diǎn)電弧的快速熄滅,因此柔性接地在配電網(wǎng)具有重要的應(yīng)用前景。針對(duì)柔性接地有功與諧波電流控制,通過(guò)建立電力電子變流器的離散模型,直接考慮數(shù)字控制的一拍延時(shí),設(shè)計(jì)了離散矢量電流控制器,在靜止坐標(biāo)系實(shí)現(xiàn)了對(duì)交流信號(hào)的無(wú)靜差調(diào)節(jié)。針對(duì)所提電流控制器,通過(guò)離散域根軌跡分析,提出了臨界阻尼參數(shù)設(shè)計(jì)方法,優(yōu)化暫態(tài)響應(yīng)避免了過(guò)補(bǔ)償。仿真結(jié)果驗(yàn)證了所提控制器與設(shè)計(jì)方法的有效性。
中圖分類(lèi)號(hào):TM464
文獻(xiàn)標(biāo)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(bǔ)償電流離散域矢量控制策略研究[J]. 電子技術(shù)應(yīng)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(wǎng)規(guī)模的不斷擴(kuò)大、電力電子變流設(shè)備以及電纜線路的大量使用,系統(tǒng)發(fā)生單相接地故障時(shí),流過(guò)接地點(diǎn)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(xiàn)有的自動(dòng)跟蹤補(bǔ)償消弧線圈只能補(bǔ)償基波無(wú)功電流,對(duì)阻性和諧波電流無(wú)能為力,導(dǎo)致故障點(diǎn)殘余電流仍然處于較大水平,電弧難以熄滅,容易引發(fā)弧光過(guò)電壓,造成設(shè)備絕緣損壞。

柔性接地在傳統(tǒng)消弧線圈接地的基礎(chǔ)上,通過(guò)增加電力電子變流器,補(bǔ)償故障電流的有功和諧波分量,實(shí)現(xiàn)了對(duì)接地電流的完全補(bǔ)償。因此,無(wú)需對(duì)已有消弧線圈及其調(diào)檔控制策略進(jìn)行改造,難點(diǎn)和關(guān)鍵點(diǎn)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(tài)調(diào)節(jié)過(guò)程發(fā)生電流超調(diào),從而避免過(guò)補(bǔ)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(xué)院 電力學(xué)院, 江蘇 南京 211167;2.南京理工大學(xué) 自動(dòng)化學(xué)院, 江蘇 南京 210096)


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