交直流混合微電網(wǎng)中雙向功率變換器控制策略及其應(yīng)用研究
發(fā)布時間：2018-08-09 14:04
【摘要】：隨著分布式能源的與日俱增,交直流混合微電網(wǎng)作為高效利用分布式能源的有效手段越來越受到關(guān)注,雙向功率變換器是交直流混合微電網(wǎng)中能量控制的核心,得到了廣泛的研究和利用。目前雙向功率變換器的控制策略通常采用變流器的傳統(tǒng)控制方法,如雙閉環(huán)、恒功率、V/F等,未考慮交直流混合微電網(wǎng)的特點。本文提出一種針對交直流混合微電網(wǎng)“源-源”特點的自治運行控制策略,能夠?qū)崿F(xiàn)微電網(wǎng)的區(qū)域自治及雙向功率變換器的模塊化并聯(lián),具有無需通信、即插即用等優(yōu)點。本文對基于低壓微電網(wǎng)下垂特性的自治運行控制策略、零序環(huán)流抑制方法及工程化關(guān)鍵技術(shù)進(jìn)行了較為深入的研究和探討。主要內(nèi)容包括:(1)研究了雙向功率變換器模型及雙閉環(huán)控制方法。建立了雙向功率變換器在不同坐標(biāo)系下的數(shù)學(xué)模型,利用該模型,針對交直流混合微電網(wǎng)特性,設(shè)計了雙向功率變換器雙閉環(huán)控制策略,并研究了該策略中控制器參數(shù)選取的理論依據(jù),最后Matlab/Simulink中搭建仿真模型對所提控制方法進(jìn)行驗證。該策略可以實現(xiàn)直流母線電壓穩(wěn)定,交、直流兩側(cè)的能量雙向流動,并對交流側(cè)功率因數(shù)進(jìn)行控制。(2)提出一種雙向功率變換器的自治運行控制策略,解決了低壓交直流混合微電網(wǎng)區(qū)域自治的問題。通過分析低壓微電網(wǎng)功率傳輸特性,建立了功率平衡與母線電壓、頻率的關(guān)系,據(jù)此設(shè)計了自治運行功率外環(huán),通過理論推導(dǎo)分析,建立了自治運行功率外與電流內(nèi)環(huán)的聯(lián)系,完成了單模塊自治運行控制系統(tǒng)的設(shè)計,最后在Matlab/Simulink中搭建仿真,對子網(wǎng)微源出力變化、負(fù)荷變化的潮流控制效果進(jìn)行驗證。該策略能夠控制交、直流子網(wǎng)母線電壓始終在允許范圍內(nèi)運行,在保留交直流混合微電網(wǎng)配置靈活性的同時提高了微電網(wǎng)的運行可靠性(3)研究了多個雙向功率變換器并聯(lián)運行時的零序環(huán)流抑制方法及模塊化自治運行控制方案。通過分析多雙向功率變換器模塊直接并聯(lián)時的零序環(huán)流平均等效模型,提出一種零序環(huán)流抑制方法,解決了多變換器并聯(lián)時零序環(huán)流過大導(dǎo)致的電流波形畸變問題。并基于平均等效模型,分析了零序電流與功率控制的關(guān)系,結(jié)合自治運行策略,提出了模塊化的自治運行控制方案。最后在Matlab/Simulink中搭建仿真,對零序環(huán)流抑制效果及模塊化自治運行控制方案的可行性進(jìn)行驗證。該方案能夠有效抑制零序環(huán)流,減少電流波形畸變,實現(xiàn)雙向功率變換器的模塊化擴(kuò)展。(4)研制了采用自治運行策略的雙向功率變換器工程樣機(jī)。詳細(xì)設(shè)計了硬件主電路、控制電路及軟件控制系統(tǒng)并研究及設(shè)計了DSP程序詳細(xì)的運行流程。在樣機(jī)的基礎(chǔ)上搭建了低壓交直流混合微電網(wǎng)實驗平臺,對文中所提出的控制策略進(jìn)行了實驗驗證。
[Abstract]:With the increasing of distributed energy sources, the AC / DC hybrid microgrid, as an effective means of efficient utilization of distributed energy, has been paid more and more attention. Bidirectional power converter is the core of energy control in AC / DC hybrid microgrid. Has been widely studied and used. At present, the conventional control methods of bidirectional power converters, such as double closed loop, constant power V / F and so on, are usually used in converter control, and the characteristics of AC / DC hybrid microgrid are not taken into account. This paper presents an autonomous operation control strategy for AC / DC hybrid microgrid, which can realize the regional autonomy of microgrid and the modularized parallel connection of bi-directional power converters. It has the advantages of no communication, plug and play, etc. In this paper, the autonomous operation control strategy based on the droop characteristics of low-voltage microgrid, the zero-sequence circulation suppression method and the key engineering techniques are deeply studied and discussed. The main contents are as follows: (1) Bidirectional power converter model and double closed loop control method are studied. The mathematical model of bidirectional power converter in different coordinate systems is established. According to the characteristics of AC / DC hybrid microgrid, a dual closed loop control strategy for bidirectional power converter is designed. The theoretical basis for the selection of controller parameters in the strategy is also studied. Finally, the simulation model in Matlab/Simulink is built to verify the proposed control method. This strategy can realize the stability of DC bus voltage, the bidirectional flow of energy on both sides of AC and DC, and the control of AC side power factor. (2) an autonomous operation control strategy of bi-directional power converter is proposed. The problem of regional autonomy of low voltage AC / DC hybrid microgrid is solved. By analyzing the power transmission characteristics of low-voltage microgrid, the relationship between power balance and bus voltage and frequency is established. Based on this, an autonomous operating power outer loop is designed. The design of the single module autonomous operation control system is completed. Finally, the simulation is built in Matlab/Simulink to verify the power flow control effect of the change of the subnet micro-source force and load. This strategy can control AC, DC subnet bus voltage is always within the allowable range, While preserving the flexibility of AC / DC hybrid microgrid configuration, the operational reliability of microgrid is improved. (3) the zero-sequence circulation suppression method and modular autonomous operation control scheme for parallel operation of several bi-directional power converters are studied. By analyzing the average equivalent model of zero-sequence circulation in direct parallel connection of multi-bidirectional power converters, a zero-sequence circulation suppression method is proposed, which solves the problem of current waveform distortion caused by excessive zero-sequence circulation in parallel. Based on the average equivalent model, the relationship between zero-sequence current and power control is analyzed, and a modular autonomous operation control scheme is proposed in combination with autonomous operation strategy. Finally, the simulation is built in Matlab/Simulink to verify the effect of zero sequence circulation suppression and the feasibility of modular autonomous operation control scheme. This scheme can effectively suppress the zero-sequence circulation, reduce the distortion of the current waveform, and realize the modularization expansion of the bi-directional power converter. (4) the engineering prototype of the bi-directional power converter with autonomous operation strategy is developed. The hardware main circuit, control circuit and software control system are designed in detail, and the detailed running flow of DSP program is studied and designed. Based on the prototype, a low voltage AC / DC hybrid microgrid experimental platform is built, and the proposed control strategy is verified experimentally.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46;TM727
本文編號：2174303
[Abstract]:With the increasing of distributed energy sources, the AC / DC hybrid microgrid, as an effective means of efficient utilization of distributed energy, has been paid more and more attention. Bidirectional power converter is the core of energy control in AC / DC hybrid microgrid. Has been widely studied and used. At present, the conventional control methods of bidirectional power converters, such as double closed loop, constant power V / F and so on, are usually used in converter control, and the characteristics of AC / DC hybrid microgrid are not taken into account. This paper presents an autonomous operation control strategy for AC / DC hybrid microgrid, which can realize the regional autonomy of microgrid and the modularized parallel connection of bi-directional power converters. It has the advantages of no communication, plug and play, etc. In this paper, the autonomous operation control strategy based on the droop characteristics of low-voltage microgrid, the zero-sequence circulation suppression method and the key engineering techniques are deeply studied and discussed. The main contents are as follows: (1) Bidirectional power converter model and double closed loop control method are studied. The mathematical model of bidirectional power converter in different coordinate systems is established. According to the characteristics of AC / DC hybrid microgrid, a dual closed loop control strategy for bidirectional power converter is designed. The theoretical basis for the selection of controller parameters in the strategy is also studied. Finally, the simulation model in Matlab/Simulink is built to verify the proposed control method. This strategy can realize the stability of DC bus voltage, the bidirectional flow of energy on both sides of AC and DC, and the control of AC side power factor. (2) an autonomous operation control strategy of bi-directional power converter is proposed. The problem of regional autonomy of low voltage AC / DC hybrid microgrid is solved. By analyzing the power transmission characteristics of low-voltage microgrid, the relationship between power balance and bus voltage and frequency is established. Based on this, an autonomous operating power outer loop is designed. The design of the single module autonomous operation control system is completed. Finally, the simulation is built in Matlab/Simulink to verify the power flow control effect of the change of the subnet micro-source force and load. This strategy can control AC, DC subnet bus voltage is always within the allowable range, While preserving the flexibility of AC / DC hybrid microgrid configuration, the operational reliability of microgrid is improved. (3) the zero-sequence circulation suppression method and modular autonomous operation control scheme for parallel operation of several bi-directional power converters are studied. By analyzing the average equivalent model of zero-sequence circulation in direct parallel connection of multi-bidirectional power converters, a zero-sequence circulation suppression method is proposed, which solves the problem of current waveform distortion caused by excessive zero-sequence circulation in parallel. Based on the average equivalent model, the relationship between zero-sequence current and power control is analyzed, and a modular autonomous operation control scheme is proposed in combination with autonomous operation strategy. Finally, the simulation is built in Matlab/Simulink to verify the effect of zero sequence circulation suppression and the feasibility of modular autonomous operation control scheme. This scheme can effectively suppress the zero-sequence circulation, reduce the distortion of the current waveform, and realize the modularization expansion of the bi-directional power converter. (4) the engineering prototype of the bi-directional power converter with autonomous operation strategy is developed. The hardware main circuit, control circuit and software control system are designed in detail, and the detailed running flow of DSP program is studied and designed. Based on the prototype, a low voltage AC / DC hybrid microgrid experimental platform is built, and the proposed control strategy is verified experimentally.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46;TM727
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 李武華;王金華;楊賀雅;顧云杰;楊歡;何湘寧;;虛擬同步發(fā)電機(jī)的功率動態(tài)耦合機(jī)理及同步頻率諧振抑制策略[J];中國電機(jī)工程學(xué)報;2017年02期
2 蔡冰倩;賈利虎;朱永強(qiáng);王銀順;;直流微電網(wǎng)電壓等級序列選擇的影響因素研究[J];電工電能新技術(shù);2016年12期
3 占愷嶠;胡澤春;宋永華;郭曉斌;許愛東;雷金勇;;含新能源接入的電動汽車有序充電分層控制策略[J];電網(wǎng)技術(shù);2016年12期
4 朱永強(qiáng);賈利虎;蔡冰倩;王銀順;;交直流混合微電網(wǎng)拓?fù)渑c基本控制策略綜述[J];高電壓技術(shù);2016年09期
5 肖朝霞;樊世軍;楊慶新;;基于分層控制策略的光伏-蓄電池系統(tǒng)動態(tài)提高并網(wǎng)點功率因數(shù)[J];電工技術(shù)學(xué)報;2016年07期
6 呂振宇;吳在軍;竇曉波;胡敏強(qiáng);;自治直流微電網(wǎng)分布式經(jīng)濟(jì)下垂控制策略[J];中國電機(jī)工程學(xué)報;2016年04期
7 孫孝峰;李歡歡;;逆變器的雙模式下垂控制[J];中國電機(jī)工程學(xué)報;2016年02期
8 張丹;王杰;;國內(nèi)微電網(wǎng)項目建設(shè)及發(fā)展趨勢研究[J];電網(wǎng)技術(shù);2016年02期
9 郭文嬌;任春光;王磊;韓肖清;趙耀民;;電壓不平衡時交直流雙向功率變換器的控制策略[J];電網(wǎng)技術(shù);2016年03期
10 吳恒;阮新波;楊東升;陳欣然;鐘慶昌;呂志鵬;;虛擬同步發(fā)電機(jī)功率環(huán)的建模與參數(shù)設(shè)計[J];中國電機(jī)工程學(xué)報;2015年24期
相關(guān)碩士學(xué)位論文 前2條
1 劉佳易;交直流混合微電網(wǎng)中雙向AC/DC功率變換器控制策略研究[D];太原理工大學(xué);2014年
2 熊超;基于PWM調(diào)制的變流器并聯(lián)零序環(huán)流控制策略研究[D];電子科技大學(xué);2013年
，本文編號：2174303
本文鏈接：http://sikaile.net/kejilunwen/dianlidianqilunwen/2174303.html
最近更新
教材專著
