1140V級聯(lián)H橋STATCOM控制策略研究
發(fā)布時間：2018-08-01 11:35
【摘要】：隨著煤炭工業(yè)自動化程度的提高,煤礦井下大量的三相異步電機和電力電子技術(shù)設(shè)備給煤礦電網(wǎng)帶來了大量的無功功率和諧波電流;且大量的電氣設(shè)備在使用過程中頻繁啟停導(dǎo)致電網(wǎng)電壓波動;另外,供電線路的老化和不平衡負(fù)載還會導(dǎo)致三相電壓不平衡。級聯(lián)H橋型靜止同步補償器(STATCOM)是解決上述問題的先進(jìn)設(shè)備,本文對1140V級聯(lián)H橋STATCOM在無功補償模式和電壓補償模式下的控制策略進(jìn)行了研究。首先,為后續(xù)控制系統(tǒng)的設(shè)計,建立了STATCOM在abc、αβγ、dq0坐標(biāo)系下的數(shù)學(xué)模型,并且根據(jù)dq0坐標(biāo)系下的數(shù)學(xué)模型推導(dǎo)出STATCOM在不平衡工況下的正負(fù)序數(shù)學(xué)模型,然后根據(jù)系統(tǒng)性能需求設(shè)計主電路的參數(shù)。其次,研究無功補償模式下基于dq0坐標(biāo)系的解耦控制策略,分析并設(shè)計PI控制器以及矢量比例積分器控制器(VPI)�？梢詫I控制器和VPI控制器并聯(lián)組合成PI-VPI控制器。理論和仿真表明PI-VPI控制器相對PI控制器有著更加優(yōu)良的諧波跟蹤性能,更適應(yīng)于煤礦井下綜合治理諧波和無功。直流側(cè)電壓控制采用總體控制、相間均壓和相內(nèi)均壓三層控制方案。相間均壓采用零序電壓注入的方法,得到很好地解決;針對載波相移的調(diào)制策略,論文采用修正調(diào)制波的方法解決相內(nèi)均壓的問題,然后通過仿真驗證了所采用的直流側(cè)電壓控制方案的有效性。再次,為提高STATCOM動態(tài)響應(yīng)速度,研究無功補償模式下基于αβγ坐標(biāo)系的模型電壓預(yù)測控制策略(MVPC)。結(jié)合多電平空間矢量調(diào)制技術(shù),提出一種適用于級聯(lián)H橋STATCOM的模型電壓預(yù)測控制策略,該策略兼有指令電流跟蹤和直流側(cè)電壓控制。仿真驗證了所提控制策略能夠有效地補償無功電流、諧波電流和不平衡電流,與解耦控制策略相比,除了諧波補償效果稍差的微弱劣勢,優(yōu)點是省略了調(diào)制環(huán)節(jié)、設(shè)計簡單、動態(tài)響應(yīng)快。最后,針對煤礦電網(wǎng)的電壓不平衡和電壓偏差的問題,分析基于雙廣義積分器鎖頻環(huán)的電壓正負(fù)序分離原理并給出正負(fù)序負(fù)載電流的分離方法。對于不平衡工況下的STATCOM直流側(cè)的能量流動分析后給出不平衡工況下的零序電壓注入方法以解決相間均壓的問題。通過在正負(fù)序指令電流上疊加檢測到的負(fù)載電流,改進(jìn)了傳統(tǒng)的正負(fù)序雙環(huán)控制策略。仿真驗證了在面對沖擊性不平衡負(fù)荷時,所提的方法與傳統(tǒng)的正負(fù)序雙環(huán)控制策略相比可以有效地減少公共連接點(point of common coupling,PCC)電壓的下降以及迅速地抑制PCC電壓不平衡度、將PCC電壓不平衡度降低到允許范圍內(nèi)。
[Abstract]:With the improvement of the automation of coal industry, a large number of three-phase asynchronous motors and power electronic equipment in coal mine have brought a lot of reactive power and harmonic current to the coal mine power network. And a large number of electrical equipment frequently start and stop in the process of power grid voltage fluctuations, in addition, the aging and unbalanced load of the power supply line will also lead to three-phase voltage imbalance. Cascaded H-bridge static synchronous compensator (STATCOM) is an advanced device to solve the above problems. In this paper, the control strategy of 1140V cascaded H-bridge STATCOM in reactive power compensation mode and voltage compensation mode is studied. Firstly, in order to design the following control system, the mathematical model of STATCOM in abc, 偽 尾 緯 -dq0 coordinate system is established, and according to the mathematical model of dq0 coordinate system, the positive and negative order mathematical model of STATCOM under unbalanced working condition is derived. Then the parameters of the main circuit are designed according to the system performance requirements. Secondly, the decoupling control strategy based on dq0 coordinate system is studied in reactive power compensation mode. Pi controller and vector proportional integrator controller (VPI). Are analyzed and designed. Pi controller and VPI controller can be combined in parallel to form a PI-VPI controller. The theory and simulation show that the PI-VPI controller has better harmonic tracking performance than Pi controller, and is more suitable for comprehensive control of harmonic and reactive power in coal mine. The DC side voltage control adopts the overall control, the phase-to-phase voltage and the inside-phase voltage three-layer control scheme. The method of zero-sequence voltage injection is used to solve the problem, and the method of correcting modulation wave is used to solve the problem of intra-phase voltage, aiming at the modulation strategy of carrier phase shift. Then the effectiveness of the DC-side voltage control scheme is verified by simulation. Thirdly, in order to improve the dynamic response speed of STATCOM, the model voltage predictive control strategy (MVPC). Based on 偽 尾 緯 coordinate system is studied in reactive power compensation mode. Combined with multilevel space vector modulation, a model voltage predictive control strategy for cascaded H-bridge STATCOM is proposed, which combines command current tracking and DC side voltage control. Simulation results show that the proposed control strategy can effectively compensate reactive current, harmonic current and unbalanced current. Compared with decoupling control strategy, in addition to the weak disadvantage of harmonic compensation, the advantages of the proposed control strategy are omitting the modulation link, and the design is simple. The dynamic response is fast. Finally, aiming at the problem of voltage imbalance and voltage deviation in coal mine power network, the principle of voltage positive and negative sequence separation based on double generalized integrator frequency locking loop is analyzed and the separation method of positive and negative sequence load current is given. Based on the analysis of the energy flow in the DC side of STATCOM under unbalanced operating conditions, a zero-sequence voltage injection method is proposed to solve the problem of phase-to-phase voltage sharing. The traditional positive and negative sequence double loop control strategy is improved by superimposing the detected load current on the positive and negative sequence instruction current. The simulation results show that the proposed method can effectively reduce the decrease of (point of common coupling voltage and reduce the imbalance of PCC voltage rapidly compared with the traditional positive and negative sequence double loop control strategy. Reduce the PCC voltage imbalance to the allowable range.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM761.12
本文編號：2157448
[Abstract]:With the improvement of the automation of coal industry, a large number of three-phase asynchronous motors and power electronic equipment in coal mine have brought a lot of reactive power and harmonic current to the coal mine power network. And a large number of electrical equipment frequently start and stop in the process of power grid voltage fluctuations, in addition, the aging and unbalanced load of the power supply line will also lead to three-phase voltage imbalance. Cascaded H-bridge static synchronous compensator (STATCOM) is an advanced device to solve the above problems. In this paper, the control strategy of 1140V cascaded H-bridge STATCOM in reactive power compensation mode and voltage compensation mode is studied. Firstly, in order to design the following control system, the mathematical model of STATCOM in abc, 偽 尾 緯 -dq0 coordinate system is established, and according to the mathematical model of dq0 coordinate system, the positive and negative order mathematical model of STATCOM under unbalanced working condition is derived. Then the parameters of the main circuit are designed according to the system performance requirements. Secondly, the decoupling control strategy based on dq0 coordinate system is studied in reactive power compensation mode. Pi controller and vector proportional integrator controller (VPI). Are analyzed and designed. Pi controller and VPI controller can be combined in parallel to form a PI-VPI controller. The theory and simulation show that the PI-VPI controller has better harmonic tracking performance than Pi controller, and is more suitable for comprehensive control of harmonic and reactive power in coal mine. The DC side voltage control adopts the overall control, the phase-to-phase voltage and the inside-phase voltage three-layer control scheme. The method of zero-sequence voltage injection is used to solve the problem, and the method of correcting modulation wave is used to solve the problem of intra-phase voltage, aiming at the modulation strategy of carrier phase shift. Then the effectiveness of the DC-side voltage control scheme is verified by simulation. Thirdly, in order to improve the dynamic response speed of STATCOM, the model voltage predictive control strategy (MVPC). Based on 偽 尾 緯 coordinate system is studied in reactive power compensation mode. Combined with multilevel space vector modulation, a model voltage predictive control strategy for cascaded H-bridge STATCOM is proposed, which combines command current tracking and DC side voltage control. Simulation results show that the proposed control strategy can effectively compensate reactive current, harmonic current and unbalanced current. Compared with decoupling control strategy, in addition to the weak disadvantage of harmonic compensation, the advantages of the proposed control strategy are omitting the modulation link, and the design is simple. The dynamic response is fast. Finally, aiming at the problem of voltage imbalance and voltage deviation in coal mine power network, the principle of voltage positive and negative sequence separation based on double generalized integrator frequency locking loop is analyzed and the separation method of positive and negative sequence load current is given. Based on the analysis of the energy flow in the DC side of STATCOM under unbalanced operating conditions, a zero-sequence voltage injection method is proposed to solve the problem of phase-to-phase voltage sharing. The traditional positive and negative sequence double loop control strategy is improved by superimposing the detected load current on the positive and negative sequence instruction current. The simulation results show that the proposed method can effectively reduce the decrease of (point of common coupling voltage and reduce the imbalance of PCC voltage rapidly compared with the traditional positive and negative sequence double loop control strategy. Reduce the PCC voltage imbalance to the allowable range.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM761.12
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 于雁南;楊榮峰;徐殿國;武健;;級聯(lián)H橋SVG的無差拍控制[J];高電壓技術(shù);2017年01期
2 劉云峰;何英杰;王超;劉進(jìn)軍;;級聯(lián)H橋多電平逆變器空間矢量調(diào)制與三角載波調(diào)制統(tǒng)一理論[J];電工技術(shù)學(xué)報;2016年16期
3 錢強;謝少軍;季林;許津銘;張斌鋒;;一種提升逆變器對電網(wǎng)適應(yīng)能力的電流控制策略[J];中國電機工程學(xué)報;2016年22期
4 董亮;李文可;溫傳新;侯凱;俞拙非;呂宏水;;鏈?zhǔn)絊TATCOM負(fù)序電流補償能力分析[J];電力系統(tǒng)自動化;2015年23期
5 吳瑕杰;熊成林;侯聶;馮曉云;;一種適用于任意電平數(shù)三相級聯(lián)H橋變換器的簡化多電平SVPWM算法[J];中國電機工程學(xué)報;2016年10期
6 張宸宇;梅軍;鄭建勇;周福舉;郭邵卿;;基于內(nèi)置重復(fù)控制器改進(jìn)無差拍的有源濾波器雙滯環(huán)控制方法[J];電工技術(shù)學(xué)報;2015年22期
7 王萌;施艷艷;沈明輝;王海明;逯亞瑩;祁明艷;;三相電壓型整流器模型電壓預(yù)測控制[J];電工技術(shù)學(xué)報;2015年16期
8 羅培;陳躍輝;羅隆福;周冠東;張志文;胡斯佳;;靜止坐標(biāo)系下鐵路電能質(zhì)量控制系統(tǒng)控制策略[J];高電壓技術(shù);2015年07期
9 莫浪嬌;駱樹權(quán);;±200 Mvar STATCOM在500kV水鄉(xiāng)站的工程實踐[J];高壓電器;2015年06期
10 徐榕;于泳;楊榮峰;于雁南;徐殿國;;H橋級聯(lián)STATCOM直流側(cè)電容電壓平衡控制方法[J];電力自動化設(shè)備;2015年05期
相關(guān)博士學(xué)位論文 前2條
1 苗長新;中壓級聯(lián)型多電平STATCOM關(guān)鍵技術(shù)研究[D];中國礦業(yè)大學(xué);2012年
2 劉錚;多電平逆變器空間矢量調(diào)制技術(shù)研究[D];湖南大學(xué);2008年
相關(guān)碩士學(xué)位論文 前4條
1 趙得剛;多電平逆變器空間矢量調(diào)制策略及電容電壓平衡研究[D];蘭州理工大學(xué);2014年
2 白建海;電氣化鐵路對電網(wǎng)諧波及三相不平衡度影響及治理措施研究[D];華北電力大學(xué);2013年
3 張銘;負(fù)載不平衡條件下STATCOM控制技術(shù)研究[D];哈爾濱工業(yè)大學(xué);2012年
4 何中一;SPWM逆變器控制技術(shù)研究[D];南京航空航天大學(xué);2005年
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