【摘要】：隨著電力負(fù)荷增長,電網(wǎng)短路水平不斷提高,短路故障將對系統(tǒng)和負(fù)載的正常運(yùn)行帶來嚴(yán)重影響,如何快速限制短路電流的問題亟待解決。此外,短路故障造成鄰近線路電能質(zhì)量問題也日漸凸顯,這將嚴(yán)重影響計(jì)算機(jī)等敏感負(fù)荷的正常工作,給國民經(jīng)濟(jì)帶來不可估量的損失。常規(guī)故障限流裝置使用頻率低,采取措施提高限流裝置利用率同時(shí)改善系統(tǒng)電能質(zhì)量,已成為國內(nèi)外的研究熱點(diǎn)之一。因此本文提出一種新型電能質(zhì)量調(diào)節(jié)與故障限流復(fù)合系統(tǒng)(hybrid-controller for power quality and fault current,HPQFC),在分析其工作原理基礎(chǔ)上,提出系統(tǒng)控制策略,并將系統(tǒng)應(yīng)用于籠型異步機(jī)(squirrel-cage induction generators,SCIG)風(fēng)電場短路故障穿越。本文比較了各類固態(tài)限流器的特點(diǎn),提出了HPQFC拓?fù)浣Y(jié)構(gòu)和工作機(jī)理,闡述了PWM穩(wěn)壓模塊、串聯(lián)變流器、濾波器和固態(tài)限流器單元,分析了系統(tǒng)電能質(zhì)量治理和短路限流工作原理。本文還對HPQFC故障檢測方法進(jìn)行了研究,通過比較常規(guī)基于dq變換的單相故障電壓檢測算法,提出了基于dq變換求導(dǎo)的故障電壓檢測算法,描述了線路電流瞬時(shí)值和電流變化率與積分的短路電流故障檢測方法。針對10k V電網(wǎng)小電流接地系統(tǒng),分析了不同接地方式下不同短路類型故障特征,研究了電能質(zhì)量調(diào)節(jié)控制策略。不接地系統(tǒng)中提出了電網(wǎng)電壓前饋以及負(fù)載電壓外環(huán)和電容電流內(nèi)環(huán)雙閉環(huán)復(fù)合控制策略;中性點(diǎn)經(jīng)消弧線圈接地系統(tǒng)由于消弧線圈作用,考慮耦合變壓器飽和影響和直流電容電壓波動(dòng)等因素,提出了改進(jìn)的雙閉環(huán)復(fù)合控制策略。小電流接地系統(tǒng)中短路故障暫態(tài)特征類似,提出了相同的故障限流控制策略。最后,本文分析了SCIG風(fēng)電場短路故障暫態(tài)過程,對比傳統(tǒng)故障穿越方法,建立了接入HPQFC的SCIG風(fēng)電場模型。分析了短路故障過程中和故障消除后HPQFC的工作模式和控制策略,并通過仿真驗(yàn)證了HPQFC故障穿越方法的有效性和優(yōu)越性。
[Abstract]:With the increase of power load, the level of short circuit in power network is increasing, and the short circuit fault will seriously affect the normal operation of the system and load. The problem of how to limit the short circuit current quickly is urgently needed to be solved. In addition, the problem of power quality of adjacent lines caused by short-circuit fault is becoming increasingly prominent, which will seriously affect the normal operation of sensitive loads such as computers and bring incalculable losses to the national economy. The frequency of conventional fault current limiter is low, and it has become one of the research hotspots at home and abroad to take measures to improve the utilization ratio of current limiter and improve the power quality of the system. In this paper, a new type of power quality regulation and fault current limiting system (hybrid-controller for power quality and fault current,HPQFC) is proposed. Based on the analysis of its working principle, the control strategy of the system is put forward. The system is applied to the short circuit fault traversing of cage asynchronous machine (squirrel-cage induction generators,SCIG) wind farm. In this paper, the characteristics of various solid-state current limiter are compared, and the topology and working mechanism of HPQFC are presented. The PWM voltage stabilizing module, series converter, filter and solid-state current limiter unit are described. The power quality control and short circuit current limiting principle of the system are analyzed. The HPQFC fault detection method is also studied in this paper. By comparing the conventional single-phase fault voltage detection algorithm based on dq transform, a fault voltage detection algorithm based on dq transform is proposed. The fault detection method of short circuit current based on instantaneous value of line current, rate of change of current and integral is described. According to the low current grounding system of 10kV power network, the fault characteristics of different short-circuit types under different grounding modes are analyzed, and the control strategy of power quality regulation is studied. In the ungrounded system, the compound control strategy of voltage feedforward, load voltage outer loop and capacitive current inner loop is proposed. Due to the effect of arc-suppression coil, considering the influence of coupling transformer saturation and DC capacitor voltage fluctuation, an improved double-closed loop compound control strategy is proposed for the neutral point grounding system through arc-suppression coil. The transient characteristics of short circuit faults in small current grounding systems are similar, and the same fault current limiting control strategy is proposed. Finally, the transient process of short circuit fault in SCIG wind farm is analyzed. Compared with the traditional fault traversing method, the SCIG wind farm model connected to HPQFC is established. The operation mode and control strategy of HPQFC in short circuit fault process and after fault elimination are analyzed, and the effectiveness and superiority of HPQFC fault crossing method are verified by simulation.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM614;TM732

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本文編號(hào)：2331784