MMC-MTDC系統(tǒng)的主從控制策略研究
發(fā)布時間：2018-12-24 13:22
【摘要】：近年來，人們越來越關注風能的開發(fā)利用，遠離負荷中心的大規(guī)模集群式風電場不斷出現。然而風電功率無法完全被本地消納，，需要對其進行集中的跨區(qū)域外送�；谀K化多電平換流器的多端直流輸電（Multi-Terminal DirectCurrent based on Modular Multilevel Converter，MMC-MTDC）系統(tǒng)同時具備了MMC高電壓、大容量的技術優(yōu)勢和MTDC系統(tǒng)靈活性、可靠性和經濟性的運行特點，成為解決這一問題的最佳方案。因此，本文對MMC-MTDC系統(tǒng)的控制策略進行了研究，使其能更好地適應風電的隨機性與間歇性。 首先研究了MMC的基本工作原理。在忽略MMC各個子模塊開關過程的基礎上，建立了MMC的交直流解耦模型，將MMC等效為相互解耦的交流回路和直流回路兩部分。在研究了MMC-HVDC控制系統(tǒng)基本構成的基礎上，根據該模型，將換流站級控制系統(tǒng)分割為交流回路控制器、環(huán)流抑制控制器和阻尼控制器三部分，并設計了基于直接電流控制策略的負責調節(jié)MMC與交流系統(tǒng)之間功率交換的交流回路控制器。 然后對MMC-MTDC系統(tǒng)的控制策略進行了研究。研究了多端柔性直流輸電系統(tǒng)最為典型的主從控制、電壓裕度控制和多點電壓下降控制。通過對比分析，將它們歸納為單一主站型控制策略和多重主站型控制策略�？紤]到直流電壓控制和有功功功率控制的強耦合性，提出了復合主站型控制策略。該控制策略讓控制直流電壓的換流站專注于電壓控制，調用其他換流站補償系統(tǒng)的波動功率。這些換流站構成復合型的主站，共同承擔傳統(tǒng)主站的控制任務，提高了整個系統(tǒng)的直流電壓質量。 最后研究了含風電場的復合主站型MMC-MTDC系統(tǒng)。運用PSCAD/EMTDC搭建基于雙饋異步發(fā)電機的風電機組模型，并應用等效參數法，對風電場進行了等值建模。在此基礎上，搭建了采用復合主站型控制策略的含風電場的四端MMC-MTDC系統(tǒng)模型，在風速變化及各種故障狀況下，對其運行特性進行了仿真研究。根據仿真結果，提出了相應的應對措施，以提高系統(tǒng)的穩(wěn)定運行能力和經濟性。
[Abstract]:In recent years, people pay more and more attention to the development and utilization of wind energy. However, the wind power can not be completely absorbed locally, and it needs to be centralized transregional delivery. Multiterminal direct current transmission (Multi-Terminal DirectCurrent based on Modular Multilevel Converter,MMC-MTDC) system based on modularized multilevel converter has the advantages of high voltage and large capacity of MMC, flexibility, reliability and economy of MTDC system. Be the best solution to this problem. Therefore, the control strategy of MMC-MTDC system is studied in this paper, so that it can adapt to the randomness and intermittency of wind power better. Firstly, the basic principle of MMC is studied. On the basis of ignoring the switching process of each sub-module of MMC, the AC / DC decoupling model of MMC is established. The MMC is equivalent to two parts of AC and DC circuits which are decoupled from each other. On the basis of studying the basic structure of MMC-HVDC control system, according to the model, the converter station control system is divided into three parts: ac loop controller, circulation suppression controller and damping controller. The AC loop controller which regulates the power exchange between MMC and AC system is designed based on direct current control strategy. Then the control strategy of MMC-MTDC system is studied. The most typical master-slave control, voltage margin control and multi-point voltage drop control for multi-terminal flexible direct current transmission system are studied. Through comparison and analysis, they are classified as single master station control strategy and multiple master station control strategy. Considering the strong coupling between DC voltage control and power control, a compound master station control strategy is proposed. The control strategy makes the converter which controls DC voltage focus on voltage control and calls other converter stations to compensate for the fluctuating power of the system. These converter stations constitute complex master stations, which jointly undertake the control tasks of traditional main stations and improve the DC voltage quality of the whole system. Finally, the composite master station MMC-MTDC system with wind farm is studied. The wind turbine model based on doubly-fed asynchronous generator is built by using PSCAD/EMTDC, and the equivalent modeling of wind farm is carried out by using equivalent parameter method. On this basis, a four-terminal MMC-MTDC system model with a composite master station control strategy is built, and its operation characteristics are simulated under the wind speed variation and various fault conditions. According to the simulation results, the corresponding countermeasures are put forward to improve the stability and economy of the system.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM721.1
本文編號：2390677
[Abstract]:In recent years, people pay more and more attention to the development and utilization of wind energy. However, the wind power can not be completely absorbed locally, and it needs to be centralized transregional delivery. Multiterminal direct current transmission (Multi-Terminal DirectCurrent based on Modular Multilevel Converter,MMC-MTDC) system based on modularized multilevel converter has the advantages of high voltage and large capacity of MMC, flexibility, reliability and economy of MTDC system. Be the best solution to this problem. Therefore, the control strategy of MMC-MTDC system is studied in this paper, so that it can adapt to the randomness and intermittency of wind power better. Firstly, the basic principle of MMC is studied. On the basis of ignoring the switching process of each sub-module of MMC, the AC / DC decoupling model of MMC is established. The MMC is equivalent to two parts of AC and DC circuits which are decoupled from each other. On the basis of studying the basic structure of MMC-HVDC control system, according to the model, the converter station control system is divided into three parts: ac loop controller, circulation suppression controller and damping controller. The AC loop controller which regulates the power exchange between MMC and AC system is designed based on direct current control strategy. Then the control strategy of MMC-MTDC system is studied. The most typical master-slave control, voltage margin control and multi-point voltage drop control for multi-terminal flexible direct current transmission system are studied. Through comparison and analysis, they are classified as single master station control strategy and multiple master station control strategy. Considering the strong coupling between DC voltage control and power control, a compound master station control strategy is proposed. The control strategy makes the converter which controls DC voltage focus on voltage control and calls other converter stations to compensate for the fluctuating power of the system. These converter stations constitute complex master stations, which jointly undertake the control tasks of traditional main stations and improve the DC voltage quality of the whole system. Finally, the composite master station MMC-MTDC system with wind farm is studied. The wind turbine model based on doubly-fed asynchronous generator is built by using PSCAD/EMTDC, and the equivalent modeling of wind farm is carried out by using equivalent parameter method. On this basis, a four-terminal MMC-MTDC system model with a composite master station control strategy is built, and its operation characteristics are simulated under the wind speed variation and various fault conditions. According to the simulation results, the corresponding countermeasures are put forward to improve the stability and economy of the system.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM721.1
【參考文獻】
相關期刊論文 前10條
1 楊思祥;李國杰;阮思燁;董健;;應用于DFIG風電場的VSC-HVDC控制策略[J];電力系統(tǒng)自動化;2007年19期
2 丁冠軍;丁明;湯廣福;;VSC-HVDC主電路拓撲及其調制策略分析與比較[J];電力系統(tǒng)自動化;2009年10期
3 管敏淵;徐政;;模塊化多電平換流器型直流輸電的建模與控制[J];電力系統(tǒng)自動化;2010年19期
4 湯廣福;賀之淵;滕樂天;易榮;何維國;;電壓源換流器高壓直流輸電技術最新研究進展[J];電網技術;2008年22期
5 孫一瑩;趙成勇;趙靜;張建坡;;基于兩相靜止坐標系的MMC-HVDC系統(tǒng)穩(wěn)態(tài)控制策略[J];電網技術;2013年05期
6 湯廣福;賀之淵;龐輝;;柔性直流輸電工程技術研究、應用及發(fā)展[J];電力系統(tǒng)自動化;2013年15期
7 李亞樓;穆清;安寧;胡曉波;;直流電網模型和仿真的發(fā)展與挑戰(zhàn)[J];電力系統(tǒng)自動化;2014年04期
8 張麗英;葉廷路;辛耀中;韓豐;范高鋒;;大規(guī)模風電接入電網的相關問題及措施[J];中國電機工程學報;2010年25期
9 姚偉;程時杰;文勁宇;;直流輸電技術在海上風電場并網中的應用[J];中國電力;2007年10期
10 劉棟;湯廣福;鄭健超;賀之淵;楊岳峰;李強;;模塊化多電平換流器小信號模型及開環(huán)響應時間常數分析[J];中國電機工程學報;2012年24期
本文編號：2390677
本文鏈接：http://www.sikaile.net/kejilunwen/dianlilw/2390677.html
教材專著
