本文選題：微電網(wǎng) + 多功能并網(wǎng)逆變器　； 參考：《浙江大學(xué)》2014年博士論文

【摘要】：全球能源危機(jī)和環(huán)境問題的不斷加劇,激勵了風(fēng)光等可再生能源并網(wǎng)技術(shù)的快速發(fā)展。作為傳統(tǒng)大規(guī)模集中式風(fēng)光電站的重要補(bǔ)充,可再生能源的分布式發(fā)電技術(shù)引起了國內(nèi)外的廣泛關(guān)注。微電網(wǎng)作為一種特殊的分布式發(fā)電系統(tǒng),是連系電網(wǎng)和可再生能源的重要橋梁和紐帶,可以有效降低可再生能源并網(wǎng)單元對電網(wǎng)的沖擊,提高供電可靠性和電能質(zhì)量,受到了普遍的青睞。然而,微電網(wǎng)中的并網(wǎng)逆變器大多只能剛性地向電網(wǎng)注入純正弦的基波有功電流,暴露出了諸多技術(shù)局限,難以滿足眾多的新興技術(shù)需求。其中,電能質(zhì)量治理、獨立自治運(yùn)行、諧波諧振抑制等并網(wǎng)逆變器的輔助服務(wù)需求最受矚目。功能更加多樣、控制更加靈活的多功能并網(wǎng)逆變器成為微電網(wǎng)領(lǐng)域極具創(chuàng)新性和挑戰(zhàn)性的研究方向之一。 本文以微電網(wǎng)中多功能并網(wǎng)逆變器的技術(shù)需求為契機(jī),系統(tǒng)深入地研究了多功能并網(wǎng)逆變器向微電網(wǎng)提供輔助服務(wù)功能的若干關(guān)鍵技術(shù)問題,獲得了一些創(chuàng)新性研究成果。 1、針對微電網(wǎng)電能質(zhì)量的主動治理,詳細(xì)研究了多功能并網(wǎng)逆變器的“并網(wǎng)發(fā)電與電能質(zhì)量統(tǒng)一控制”技術(shù),實現(xiàn)對微電網(wǎng)內(nèi)無功、負(fù)序和諧波負(fù)荷電流的補(bǔ)償。 一方面,對于單臺多功能并網(wǎng)逆變器的電能質(zhì)量優(yōu)化補(bǔ)償控制,提出了微電網(wǎng)電能質(zhì)量綜合評估的概念,并在此基礎(chǔ)上提出了相應(yīng)的控制策略,利用多功能并網(wǎng)逆變器的功率裕量實現(xiàn)微電網(wǎng)電能質(zhì)量的定制。針對三相組式和三相兩電平兩大類多功能并網(wǎng)逆變器,進(jìn)行了詳實的仿真和實驗研究,驗證了多功能并網(wǎng)逆變器在優(yōu)化地提供電能質(zhì)量治理輔助服務(wù),以及有目標(biāo)地定制微電網(wǎng)電能質(zhì)量方面的可行性和有效性。 另一方面,對于多臺多功能并網(wǎng)逆變器之間的電能質(zhì)量協(xié)調(diào)控制,基于電導(dǎo)電納限幅控制和下垂控制,分別提出了兩種微電網(wǎng)諧波和無功電流的無互聯(lián)線分?jǐn)偪刂撇呗?以有效地組織和協(xié)調(diào)微電網(wǎng)內(nèi)相對分散的多臺多功能并網(wǎng)逆變器,獨立自治地參與微電網(wǎng)電能質(zhì)量的治理。嚴(yán)格的實驗結(jié)果驗證了所提的兩種控制方案在協(xié)調(diào)微電網(wǎng)內(nèi)多臺多功能并網(wǎng)逆變器,主動參與微電網(wǎng)電能質(zhì)量治理方面的正確性和有效性,以及其適應(yīng)微電網(wǎng)“即插即用”、“在線熱插拔”等功能需求的能力。 2、針對微電網(wǎng)并網(wǎng)逆變器的獨立自治運(yùn)行,重點研究了多功能并網(wǎng)逆變器的“虛擬同步發(fā)電機(jī)”控制技術(shù),利用多功能并網(wǎng)逆變器模擬傳統(tǒng)同步發(fā)電機(jī)的同步機(jī)制和搖擺方程,虛擬慣性和阻尼,實現(xiàn)其對1Hz級的搖擺方程等機(jī)電暫態(tài)過程的控制能力。同時,還可以模擬同步發(fā)電機(jī)的調(diào)壓和調(diào)頻特性,向電網(wǎng)提供電壓和頻率支撐的輔助服務(wù)。系統(tǒng)地研究了虛擬同步發(fā)電機(jī)控制技術(shù)的數(shù)學(xué)模型,并深入討論了控制器參數(shù)對虛擬同步發(fā)電機(jī)性能的影響,以及虛擬慣性和阻尼參數(shù)的整定策略。此外,還詳細(xì)闡釋了虛擬同步發(fā)電機(jī)儲能單元的優(yōu)化配置方法。通過所研究的虛擬同步發(fā)電機(jī)控制策略,可以使得多功能并網(wǎng)逆變器具有更多的柔性,對電網(wǎng)更加友好。利用仿真和實驗結(jié)果驗證了所提模型和控制方法的正確性和有效性。 3、針對含多臺并網(wǎng)逆變器的微電網(wǎng)的諧波諧振及抑制,重點研究了多功能并網(wǎng)逆變器的“輸出阻抗重塑”技術(shù),通過重塑多功能并網(wǎng)逆變器的輸出阻抗,可以對微電網(wǎng)幾kHz處的諧波諧振頻率分量加以有效的阻尼。從開環(huán)等效電路和閉環(huán)等效電路兩個角度,詳細(xì)闡釋了微電網(wǎng)中多臺并網(wǎng)逆變器諧波諧振的機(jī)理,并在此基礎(chǔ)上提出了多功能并網(wǎng)逆變器輸出阻抗重塑的概念,通過控制多功能并網(wǎng)逆變器輸出阻抗,向微電網(wǎng)注入更多的虛擬電阻分量,從而有效地抑制微電網(wǎng)內(nèi)的諧波諧振。仿真和實驗結(jié)果驗證了所提輸出阻抗重塑技術(shù)的可行性和有效性。 本文針對微電網(wǎng)中并網(wǎng)逆變器的電能質(zhì)量治理、獨立自治運(yùn)行和諧波諧振抑制三大關(guān)鍵技術(shù)需求,分別從針對諧波負(fù)荷電流的“并網(wǎng)發(fā)電與電能質(zhì)量統(tǒng)一控制”技術(shù)、針對幾Hz頻段的“虛擬同步發(fā)電機(jī)”技術(shù)和針對幾kHz頻段的“輸出阻抗重塑”技術(shù)的角度給出了相應(yīng)的應(yīng)對措施,使得并網(wǎng)逆變器在性能上更加靈活,在功能上更加多樣,并能向微電網(wǎng)提供更加豐富的輔助服務(wù),具有很好的研究價值和應(yīng)用前景。當(dāng)然,隨著技術(shù)的發(fā)展,并網(wǎng)逆變器(甚至是其他并網(wǎng)變流器)還可能為電網(wǎng)提供更加豐富的輔助服務(wù),這有待進(jìn)一步的研究。
[Abstract]:The growing global energy crisis and environmental problems have stimulated the rapid development of renewable energy grid technology, such as scenery. As an important supplement to the traditional large-scale centralized wind power plant, the distributed generation technology of renewable energy has aroused widespread concern at home and abroad. As a special distributed generation system, the micro grid is connected. The important bridge and link of power grid and renewable energy can effectively reduce the impact of the renewable energy grid unit on the power grid and improve the power supply reliability and power quality. However, most of the grid connected inverters in the microgrid can only inject pure sine basic active current into the power grid. It is difficult to meet many new technology needs. Among them, the demand for auxiliary services of grid connected inverters, such as power quality control, independent autonomous operation, harmonic resonance suppression, is the most attractive. The multi-function and multi function grid connected inverters with more versatile functions and more flexible control have become the most innovative and challenging research direction in the field of microgrid. One of.
In this paper, based on the technical requirements of multi-function grid connected inverters in microgrid, this paper systematically studies some key technical problems of providing auxiliary services to microgrid by multi-function grid connected inverters, and obtains some innovative research results.
1, in view of the active control of the power quality of the microgrid, the "unified control of grid connected generation and power quality control" for multi-function grid connected inverters is studied in detail, which can compensate for the reactive power, negative sequence and harmonic load current in the microgrid.
On the one hand, for the power quality optimization compensation control of the single multi-function grid connected inverter, the concept of the comprehensive evaluation of the power quality of the microgrid is proposed. On this basis, the corresponding control strategy is put forward, and the power quality of the microgrid is customized by the power margin of the multifunction grid connected inverter. The three phase and the three-phase two levels are used. Two kinds of multi-function grid connected inverters are carried out in detail, and the detailed simulation and experimental research are carried out. The feasibility and effectiveness of the multi-function grid connected inverter to provide the power quality control auxiliary service and to customize the power quality of the microgrid with the target are verified.
On the other hand, for the coordination control of power quality between multifunction grid connected inverters, two kinds of non interconnected line sharing control strategy for harmonic and reactive current of micro grid are proposed, based on the control and droop control of electrical conductivity, so as to organize and coordinate the multi function multifunction grid connected inverters which are relatively scattered in the microgrid. The independent autonomous region participates in the control of the power quality of microgrid. The strict experimental results verify that the two proposed control schemes are coordinated in the micro grid with multiple multi-function grid connected inverters, actively participating in the correctness and effectiveness of the power quality control of microgrid, and their adaptation to the micro grid "plug and play", "online hot plug" and so on. Ability to function.
2, in view of the independent autonomous operation of the grid connected inverters in microgrid, the "virtual synchronous generator" control technology of multi-function grid connected inverters is emphatically studied. The synchronization mechanism and swing equation, virtual inertia and damping of the traditional synchronous generator are simulated by the multi-function grid connected inverter, and the electromechanical transient transient over the 1Hz level swing equation is realized. At the same time, it can also simulate the voltage regulation and frequency modulation characteristics of the synchronous generator, provide the auxiliary service of voltage and frequency support to the power grid. The mathematical model of the control technology of the virtual synchronous generator is studied systematically, and the influence of the controller parameters on the performance of the virtual synchronous generator, as well as the virtual inertia and resistance are discussed. In addition, the optimized configuration method of the virtual synchronous generator energy storage unit is explained in detail. Through the study of the virtual synchronous generator control strategy, the multi-function grid connected inverter can have more flexibility and more friendly to the power grid. The model and the control side are verified by the simulation and experimental results. The validity and validity of the law.
3, in view of harmonic resonance and suppression of the micro grid with multiple grid connected inverters, the "output impedance reshaping" technique of multifunction grid connected inverters is emphatically studied. By remolding the output impedance of the multifunction grid connected inverter, the harmonic resonant frequency of a few kHz of the microgrid can be effectively damped. In the two angles of the ring equivalent circuit, the harmonic resonance mechanism of multiple grid connected inverters in the microgrid is explained in detail. On this basis, the concept of remolding the output impedance of a multi-function grid connected inverter is proposed. By controlling the output impedance of the multifunction grid connected inverter, more virtual resistance components are injected into the microgrid, thus effectively restraining the micro electricity. The simulation and experimental results verify the feasibility and effectiveness of the proposed output impedance reconstruction technology.
Aiming at the power quality control of the grid connected inverters in the microgrid and the three key technology requirements of the independent autonomous running harmonic resonance suppression, the "unified control of grid connected generation and power quality control" for harmonic load current, "virtual synchronous generator" technology for several Hz frequency bands and the "output" for several kHz bands, are introduced in this paper. The impedance remolding technology gives the corresponding countermeasures, which makes the grid connected inverters more flexible in performance, more diverse in function, and can provide more abundant auxiliary services to the microgrid. It has good research value and application prospects. Of course, with the development of technology, grid inverters (even other grid connected converter) It may also provide more abundant ancillary services for the power grid, which needs further study.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM464

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 鞏冰;許鐵巖;朱麗娟;孟繁榮;;基于滑動Goertzel DFT和相位補(bǔ)償算法的諧波電流檢測算法[J];電測與儀表;2010年09期

2 蘇建徽;汪長亮;;基于虛擬同步發(fā)電機(jī)的微電網(wǎng)逆變器[J];電工電能新技術(shù);2010年03期

3 汪海寧,蘇建徽,張國榮,茆美琴,丁明;光伏并網(wǎng)發(fā)電及無功補(bǔ)償?shù)慕y(tǒng)一控制[J];電工技術(shù)學(xué)報;2005年09期

4 吳理博;趙爭鳴;劉建政;王健;袁立強(qiáng);;具有無功補(bǔ)償功能的單級式三相光伏并網(wǎng)系統(tǒng)[J];電工技術(shù)學(xué)報;2006年01期

5 郭小強(qiáng);鄔偉揚(yáng);顧和榮;王立喬;趙清林;;并網(wǎng)逆變器LCL接口直接輸出電流控制建模及穩(wěn)定性分析[J];電工技術(shù)學(xué)報;2010年03期

6 劉飛;查曉明;段善旭;;三相并網(wǎng)逆變器LCL濾波器的參數(shù)設(shè)計與研究[J];電工技術(shù)學(xué)報;2010年03期

7 伍小杰;孫蔚;戴鵬;周娟;;一種虛擬電阻并聯(lián)電容有源阻尼法[J];電工技術(shù)學(xué)報;2010年10期

8 王曉寰;張純江;;分布式發(fā)電系統(tǒng)無縫切換控制策略[J];電工技術(shù)學(xué)報;2012年02期

9 謝震;張興;楊淑英;劉芳;;基于電容電壓反饋的直驅(qū)風(fēng)力發(fā)電變流器控制[J];電力電子技術(shù);2009年08期

10 金廣厚,李庚銀,周明;電能質(zhì)量市場理論的初步探討[J];電力系統(tǒng)自動化;2004年12期

相關(guān)博士學(xué)位論文 前2條

1 沈國橋;燃料電池并網(wǎng)逆變技術(shù)研究[D];浙江大學(xué);2008年

2 楊歡;混合能源系統(tǒng)若干關(guān)鍵部件的研究[D];浙江大學(xué);2008年

，

本文編號：2026703