發(fā)布時間：2018-04-18 03:28

  本文選題：逆變型分布式電源 + 控制策略　； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：隨著能源危機(jī)和環(huán)境污染的加劇以及傳統(tǒng)電網(wǎng)安全穩(wěn)定問題的凸顯，以清潔能源為基礎(chǔ)的分布式電源（distributed generation，DG）接入配電網(wǎng)已成為電網(wǎng)發(fā)展的必然趨勢。大量分布式電源的接入，使得傳統(tǒng)配電網(wǎng)的故障特征，如短路電流的大小和方向等發(fā)生了變化。目前廣泛使用的逆變型分布式電源（inverter interfaced distributed generation，IIDG）具有輸出響應(yīng)快的特點(diǎn)，要實(shí)現(xiàn)其故障特性的準(zhǔn)確分析必須充分計(jì)及控制策略的影響。另外，最新的并網(wǎng)規(guī)定要求IIDG在故障時不僅保持并網(wǎng)運(yùn)行，還需向電網(wǎng)注入無功功率，以支撐電網(wǎng)電壓。為此，本文計(jì)及IIDG的控制特性，提出了一種適用于最新并網(wǎng)規(guī)定的含PQ控制IIDG的配電網(wǎng)故障分析方法。 針對并網(wǎng)運(yùn)行時廣泛采用PQ控制策略的IIDG，基于其數(shù)學(xué)模型，采用雙環(huán)控制方式，并對其輸出特性進(jìn)行分析；針對不對稱條件下，傳統(tǒng)PI環(huán)節(jié)不能實(shí)現(xiàn)無靜差控制以及IIDG注入負(fù)序電流帶來的問題，在雙同步旋轉(zhuǎn)dq坐標(biāo)系下，采用消除IIDG負(fù)序電流控制策略，減輕對逆變器和電網(wǎng)的負(fù)面影響；計(jì)及最新并網(wǎng)規(guī)定，對IIDG采用具有電壓支撐能力的故障穿越控制策略，仿真結(jié)果驗(yàn)證了策略的有效性。 基于電力系統(tǒng)仿真平臺DIgSILENT，搭建了含PQ控制策略IIDG的配電網(wǎng)模型，利用仿真分析方法，對IIDG的故障暫態(tài)特性進(jìn)行研究；計(jì)及控制策略的影響，通過分析IIDG的控制系統(tǒng)響應(yīng)過程，提出IIDG在對稱故障和不對稱故障情況下的故障等值模型，，并通過仿真驗(yàn)證了所提等值模型的準(zhǔn)確性。 針對含多個IIDG的配電網(wǎng)模型，利用本文提出的計(jì)及控制特性的IIDG故障等值模型，建立故障下的節(jié)點(diǎn)電壓方程，并針對不同IIDG間的相互耦合關(guān)系以及IIDG并網(wǎng)點(diǎn)電壓與IIDG故障電流的非線性關(guān)系，提出相應(yīng)的迭代修正求解方法，最后通過仿真算例，驗(yàn)證了所提方法的可行性和有效性。
[Abstract]:With the aggravation of energy crisis and environmental pollution as well as the security and stability of traditional power grid, distributed generation based on clean energy (DGG) has become an inevitable trend in the development of power grid.With the access of a large number of distributed power sources, the fault characteristics of traditional distribution network, such as the size and direction of short-circuit current, have changed.Inverter interfaced distributed Generation (IIDG), which is widely used at present, has the characteristics of fast output response. In order to realize accurate analysis of its fault characteristics, the influence of control strategy must be fully taken into account.In addition, the latest grid-connected regulations require IIDG not only to maintain grid-connected operation in the event of failure, but also to inject reactive power into the power grid to support the grid voltage.In this paper, considering the control characteristics of IIDG, a fault analysis method for distribution network with PQ controlled IIDG is proposed.In view of IIDG, which widely adopts PQ control strategy in grid-connected operation, based on its mathematical model, the double loop control method is adopted and its output characteristics are analyzed.The traditional Pi link can not realize the problems caused by no static error control and IIDG injection negative sequence current. In the double synchronous rotating DQ coordinate system, the negative sequence current control strategy of eliminating IIDG is adopted to reduce the negative influence on inverter and power grid.Considering the latest grid-connected regulations, a fault crossing control strategy with voltage support capability is adopted for IIDG. The simulation results verify the effectiveness of the strategy.Based on the power system simulation platform, the distribution network model with PQ control strategy IIDG is built, and the transient characteristics of IIDG are studied by using simulation analysis method, considering the influence of control strategy, the response process of IIDG control system is analyzed.The equivalent fault model of IIDG in the case of symmetric fault and asymmetric fault is proposed, and the accuracy of the proposed equivalent model is verified by simulation.For the distribution network model with multiple IIDG, the nodal voltage equation under the fault is established by using the IIDG fault equivalent model which takes into account the control characteristics proposed in this paper.According to the mutual coupling relationship between different IIDG and the nonlinear relation between IIDG parallel dot voltage and IIDG fault current, the corresponding iterative correction method is proposed. Finally, the feasibility and effectiveness of the proposed method are verified by a simulation example.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM711

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