【摘要】：隨著信息化技術(shù),新能源技術(shù)的不斷發(fā)展,逆變器并聯(lián)成為一個(gè)重要的研究領(lǐng)域。用戶(hù)對(duì)電源的要求越來(lái)越高,用電設(shè)備的增多,大功率多機(jī)并聯(lián)成為趨勢(shì)。因此,實(shí)現(xiàn)逆變器的穩(wěn)定并聯(lián)運(yùn)行研究工作顯得尤為重要。 本文主要研究了基于PQ下垂的逆變器并聯(lián)運(yùn)行策略。根據(jù)在線(xiàn)式UPS的運(yùn)行特點(diǎn),提出了一種兼顧市電鎖相,同時(shí)實(shí)現(xiàn)無(wú)內(nèi)聯(lián)線(xiàn)并聯(lián)的解決方案。為了實(shí)現(xiàn)更好的控制效果,在已有網(wǎng)絡(luò)控制基礎(chǔ)上,研究了總線(xiàn)拓?fù)渚W(wǎng)絡(luò)控制多機(jī)逆變器并聯(lián)系統(tǒng),并對(duì)網(wǎng)絡(luò)控制的數(shù)學(xué)模型及信號(hào)時(shí)延進(jìn)行了深入分析。 首先本文基于UPS的單機(jī)控制,提出幅值外環(huán)電壓內(nèi)環(huán)的控制方法,并通過(guò)加入虛擬阻抗改變逆變器的輸出阻抗,有利于更好的實(shí)現(xiàn)逆變器并聯(lián)控制。實(shí)驗(yàn)結(jié)果表明UPS單機(jī)在阻性負(fù)載和非線(xiàn)性負(fù)載的情況下有比較好的穩(wěn)態(tài)動(dòng)態(tài)效果,為UPS無(wú)內(nèi)聯(lián)線(xiàn)并聯(lián)奠定了比較好的基礎(chǔ)。 無(wú)內(nèi)聯(lián)線(xiàn)并聯(lián)P-ω,Q-V下垂方法與市電鎖相會(huì)同時(shí)調(diào)節(jié)ω量,存在一定矛盾。為了解決逆變器并聯(lián)且兼顧市電鎖相,本文提出基于阻性下垂并跟蹤市電鎖相的控制方法,實(shí)現(xiàn)了在線(xiàn)式UPS無(wú)內(nèi)聯(lián)線(xiàn)并聯(lián)。阻性和非線(xiàn)性負(fù)載并聯(lián)實(shí)驗(yàn)良好的均流效果驗(yàn)證了方案的正確性。 基于PQ下垂的無(wú)內(nèi)聯(lián)線(xiàn)并聯(lián)逆變系統(tǒng)不易實(shí)現(xiàn)更高的穩(wěn)態(tài)均流度,且逆變器智能化控制成為趨勢(shì)�；陔娏﹄娮泳W(wǎng)絡(luò)控制技術(shù),本文研究了多臺(tái)三相逆變器并聯(lián)網(wǎng)絡(luò)控制,詳細(xì)分析了網(wǎng)絡(luò)控制逆變器并聯(lián)的數(shù)學(xué)模型,并分析了系統(tǒng)所能接受的最大時(shí)延,最后利用網(wǎng)絡(luò)控制實(shí)現(xiàn)了多臺(tái)逆變器并聯(lián)運(yùn)行。實(shí)驗(yàn)結(jié)果表明采用網(wǎng)絡(luò)控制策略的逆變器并聯(lián)輸出電流均流度更高,具有良好的穩(wěn)態(tài)動(dòng)態(tài)性能,驗(yàn)證了方案的有效性。
[Abstract]:With the development of information technology and new energy technology, parallel inverter becomes an important research field. The demand of power supply is higher and higher, and the increase of electric equipment, high power and multi-machine parallel connection become the trend. Therefore, it is very important to realize the stable parallel operation of inverter. This paper mainly studies the parallel operation strategy of inverter based on PQ droop. According to the running characteristics of on-line UPS, this paper presents a solution to realize parallel connection without internal wire. In order to achieve better control effect, based on the existing network control, the bus topology network control multi-machine inverter parallel system is studied, and the mathematical model of network control and signal delay are deeply analyzed. Firstly, based on the single machine control of UPS, this paper presents the control method of the voltage inner loop of the amplitude outer loop, and changes the output impedance of the inverter by adding the virtual impedance, which is helpful to realize the parallel control of the inverter better. The experimental results show that the UPS single machine has better steady dynamic effect in the case of resistive load and nonlinear load, which lays a good foundation for the parallel connection of UPS without internal connection. The parallel P- 蠅, Q-V sag method without inner connection can adjust omega at the same time as the electric lock, and there are some contradictions. In order to solve the problem of parallel inverter and power phase lock, this paper presents a control method based on resistive droop and tracking the phase lock, and realizes the parallel connection of on-line UPS without inner connection. The correctness of the scheme is verified by the good current-sharing effect of resistive and nonlinear load parallel experiments. It is difficult to achieve higher steady-state average fluidity of parallel inverter system without internal wire based on PQ droop, and intelligent control of inverter becomes a trend. Based on the power electronic network control technology, this paper studies the parallel network control of several three-phase inverters, analyzes the mathematical model of the parallel network control inverter in detail, and analyzes the maximum time delay that the system can accept. Finally, the parallel operation of several inverters is realized by network control. The experimental results show that the parallel output current of the inverter with network control strategy has higher average current and better steady-state dynamic performance. The effectiveness of the proposed scheme is verified.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM464

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