本文選題：微網(wǎng)　切入點(diǎn)：DSMS　出處：《北京交通大學(xué)》2014年博士論文

【摘要】：摘要：微網(wǎng)是由分布式電源、負(fù)荷、儲(chǔ)能、監(jiān)控和保護(hù)裝置共同組成的小型發(fā)配電系統(tǒng),它具有并網(wǎng)和孤島兩種運(yùn)行模式,可提高負(fù)荷供電可靠性。微網(wǎng)中的分布式電源通常采用電力電子裝置接入電網(wǎng),電力電子裝置慣性小且過載能力差,增加了微網(wǎng)系統(tǒng)的控制難度；而電力電子裝置的靈活、可控特性則為微網(wǎng)系統(tǒng)電能質(zhì)量改善提供了便利條件�；陔娏﹄娮友b置的運(yùn)行特性,本文對(duì)微網(wǎng)在孤島模式下的穩(wěn)定性提高和電能質(zhì)量改善展開研究,主要工作如下： (1)圍繞孤島模式微網(wǎng)的小信號(hào)穩(wěn)定性分析展開研究�；诶钛牌罩Z夫第一法思想,對(duì)微網(wǎng)系統(tǒng)小信號(hào)模型計(jì)算及穩(wěn)定性判定方法進(jìn)行了描述。根據(jù)微源的控制特性,建立了單臺(tái)下垂控制支撐微源(Droop-cntrol surpporting micro source, DSMS)狀態(tài)方程,并對(duì)其小信號(hào)模型進(jìn)行了計(jì)算。從多DSMS、供電微源(Feeding micro source, FMS)組網(wǎng)系統(tǒng)的拓?fù)浣Y(jié)構(gòu)出發(fā),以特定系統(tǒng)為例,闡述了多DSMS、FMS組網(wǎng)系統(tǒng)的小信號(hào)模型計(jì)算方法。計(jì)算了負(fù)荷阻抗、下垂增益變化時(shí)特定多DSMS、FMS組網(wǎng)系統(tǒng)的特征值,確定了影響系統(tǒng)穩(wěn)定性的關(guān)鍵參數(shù),并采用時(shí)域仿真對(duì)關(guān)鍵參數(shù)計(jì)算結(jié)果的正確性進(jìn)行了驗(yàn)證。 (2)圍繞虛擬阻抗對(duì)DSMS控制性能的影響展開研究。從等效電路出發(fā),分析不同線路阻抗對(duì)DSMS輸出功率解耦控制性能的影響,確定了導(dǎo)致DSMS輸出功率耦合的原因。給出基于虛擬阻抗實(shí)現(xiàn)DSMS功率解耦的控制方法,通過對(duì)DSMS實(shí)際輸出功率的計(jì)算,闡述了虛擬阻抗實(shí)現(xiàn)DSMS輸出功率解耦控制的機(jī)理,明確了不同功率耦合程度下虛擬阻抗選取的原則。根據(jù)虛擬阻抗的實(shí)現(xiàn)方法和線性化模型,分析了虛擬阻抗控制對(duì)DSMS輸出電壓和穩(wěn)定性的影響。 (3)圍繞多DSMS、FMS組網(wǎng)系統(tǒng)的電能質(zhì)量改善策略展開研究�；贔MS系統(tǒng)的等效電路計(jì)算,確定了影響FMS系統(tǒng)諧振頻率等效阻抗的關(guān)鍵參數(shù),并對(duì)FMS系統(tǒng)的有源阻尼實(shí)現(xiàn)方法進(jìn)行了討論。從DSMS的諧波等效電路出發(fā),推導(dǎo)了DSMS系統(tǒng)輸出電壓的諧波分量表示,提出了降低DSMS輸出電壓諧波分量的控制方法。對(duì)DSMS與公共耦合點(diǎn)(Point of common coupling, PCC)電壓的基波負(fù)序矢量關(guān)系進(jìn)行了分析,確定了導(dǎo)致PCC與DSMS的輸出電壓基波負(fù)序分量差異的原因,提出了基于二次控制降低PCC不平衡電壓的控制策略,并分析了二次控制延時(shí)對(duì)系統(tǒng)穩(wěn)定性的影響。 (4)圍繞含多DSMS微網(wǎng)系統(tǒng)的負(fù)荷合理分擔(dān)問題展開研究。給出了集中式負(fù)荷工況下的多DSMS微網(wǎng)系統(tǒng)等效電路,對(duì)線性不平衡負(fù)荷、非線性負(fù)荷工況下DSMS的負(fù)荷分擔(dān)原理進(jìn)行了分析,確定了線路阻抗對(duì)DSMS負(fù)荷分擔(dān)性能的影響。對(duì)基于虛擬負(fù)序?qū)Ъ{實(shí)現(xiàn)負(fù)荷合理分擔(dān)的控制原理進(jìn)行了分析,提出了采用虛擬阻抗實(shí)現(xiàn)多DSMS系統(tǒng)負(fù)荷分擔(dān)性能改善的控制策略。從DSMS基波負(fù)序、諧波分量等效電路出發(fā),對(duì)DSMS輸出電壓的基波負(fù)序、諧波分量表達(dá)式進(jìn)行了推導(dǎo),分析了DSMS負(fù)荷分擔(dān)性能改善控制策略對(duì)輸出電壓基波負(fù)序、諧波分量的影響。
[Abstract]:Abstract: microgrid is a distributed power supply, load, energy storage, small distribution power system monitoring and protection device composed of, it has two kinds of grid and island operation mode, can improve the reliability of power supplying. Distributed power in the microgrid usually uses power electronic devices connected to the power grid, power electronic devices and small inertia overload poor ability, increasing the difficulty of control system; and the power electronic equipment is flexible and controllable characteristics for micro grid power system provides the convenience of quality improvement. The operation characteristics of power electronic devices based on the microgrid in islanding mode improves the stability and power quality improvement research, the main work the following:
(1) research focus on the analysis of small signal stability of microgrid islanding mode. Lyapunov first method based on the idea of micro calculation and stability of small signal model network system determination method are described. According to the control characteristics of micro sources, a single microsource droop control support (Droop-cntrol surpporting micro source, DSMS) the equation of state, and the small signal model is calculated. From DSMS, the power supply of micro source (Feeding micro source, FMS) of the topological structure of the network system, in particular system as an example, describes DSMS, calculating the small signal model of FMS network system. The method of load impedance calculation, droop gain variation when the specific characteristics of DSMS, FMS network value, determine the key parameters affecting the stability of the system, and the correctness of the simulation calculation results of critical parameters are verified.
(2) the virtual impedance studies the impact of DSMS control performance. Starting from the equivalent circuit analysis, different line impedance of DSMS output power decoupling control performance influence, determine the causes of DSMS output power coupling. Given the control method of virtual impedance DSMS power decoupling based on DSMS, through the calculation of the actual output power the virtual impedance mechanism of DSMS output power decoupling control, the virtual impedance different power coupling under the principle of selection. According to the implementation method and the linear model of virtual impedance analysis, virtual impedance control effect on the output voltage of DSMS and stability.
(3) on DSMS, FMS network power quality improvement strategy is studied. Calculation of equivalent circuit based on the FMS system, to determine the effect of key parameters of FMS system resonant frequency equivalent impedance, and active damping of FMS system realization method are discussed. Starting from the DSMS harmonic equivalent circuit is derived the harmonic component of output voltage of the DSMS system, puts forward the method to control and reduce the DSMS output voltage harmonic component. To the point of common coupling (Point DSMS and of common coupling, PCC) fundamental negative sequence voltage vector relationship are analyzed, to determine the cause of the output voltage fundamental negative sequence differences between PCC and DSMS. Put forward two times lower PCC unbalanced control strategy based on voltage, and analyzed the influence of the two control delay on the stability of the system.
(4) the containing DSMS microgrid load sharing problem is studied. The DSMS centralized load microgrid equivalent circuit of linear unbalanced load, analyzed the load DSMS nonlinear load sharing principle, to determine the impact of performance sharing on DSMS load line impedance. The virtual negative sequence admittance control principle based on load sharing is analyzed, the control strategy was proposed to realize load sharing to improve the performance of multi DSMS system based on virtual impedance. From DSMS fundamental negative sequence and harmonic component equivalent circuit of the negative sequence component of the DSMS output voltage, harmonic component expressions are deduced and analyzed the DSMS load sharing control strategy to improve the performance of the output voltage fundamental negative influence, harmonic components.

【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM711

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