【摘要】：隨著煤炭工業(yè)自動(dòng)化程度的提高,煤礦井下大量的三相異步電機(jī)和電力電子技術(shù)設(shè)備給煤礦電網(wǎng)帶來(lái)了大量的無(wú)功功率和諧波電流;且大量的電氣設(shè)備在使用過(guò)程中頻繁啟停導(dǎo)致電網(wǎng)電壓波動(dòng);另外,供電線路的老化和不平衡負(fù)載還會(huì)導(dǎo)致三相電壓不平衡。級(jí)聯(lián)H橋型靜止同步補(bǔ)償器(STATCOM)是解決上述問(wèn)題的先進(jìn)設(shè)備,本文對(duì)1140V級(jí)聯(lián)H橋STATCOM在無(wú)功補(bǔ)償模式和電壓補(bǔ)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(jì),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(jì)主電路的參數(shù)。其次,研究無(wú)功補(bǔ)償模式下基于dq0坐標(biāo)系的解耦控制策略,分析并設(shè)計(jì)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(duì)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(wú)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(duì)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(wèn)題,然后通過(guò)仿真驗(yàn)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(dòng)態(tài)響應(yīng)速度,研究無(wú)功補(bǔ)償模式下基于αβγ坐標(biāo)系的模型電壓預(yù)測(cè)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(jí)聯(lián)H橋STATCOM的模型電壓預(yù)測(cè)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(yàn)證了所提控制策略能夠有效地補(bǔ)償無(wú)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(bǔ)償效果稍差的微弱劣勢(shì),優(yōu)點(diǎn)是省略了調(diào)制環(huán)節(jié)、設(shè)計(jì)簡(jiǎn)單、動(dòng)態(tài)響應(yīng)快。最后,針對(duì)煤礦電網(wǎng)的電壓不平衡和電壓偏差的問(wèn)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(duì)于不平衡工況下的STATCOM直流側(cè)的能量流動(dòng)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(wèn)題。通過(guò)在正負(fù)序指令電流上疊加檢測(cè)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(yàn)證了在面對(duì)沖擊性不平衡負(fù)荷時(shí),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(diǎn)(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(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM761.12

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