發(fā)布時間：2019-01-12 18:49

【摘要】：多端柔性直流輸電是智能電網(wǎng)的重要組成部分,也是當(dāng)前的研究熱點。一方面,為了保證多端柔性直流輸電系統(tǒng)的安全穩(wěn)定運行,需要對其協(xié)調(diào)控制策略進行深入研究;另一方面,多端柔性直流輸電系統(tǒng)的推廣應(yīng)用也需要具備較好的經(jīng)濟性,需要對其網(wǎng)絡(luò)運行進行優(yōu)化。本文研究基于最優(yōu)潮流的含電壓源型換流器的多端柔性直流輸電系統(tǒng)控制策略,具有一定的理論意義和工程應(yīng)用價值。本文首先對柔性直流輸電系統(tǒng)的結(jié)構(gòu)和原理進行分析,對多端柔性直流輸電系統(tǒng)的系統(tǒng)級控制策略和換流站級控制方法進行研究,并根據(jù)這些控制策略的特點,利用廣義下垂控制方式,實現(xiàn)電壓源型換流器控制策略的無縫切換。然后,對多端柔性直流輸電系統(tǒng)的最優(yōu)潮流進行研究,提出了兼顧降低有功網(wǎng)損、減小系統(tǒng)電壓偏差及增大系統(tǒng)靜態(tài)電壓穩(wěn)定裕度的多目標潮流優(yōu)化模型。在此基礎(chǔ)上,提出了基于內(nèi)點法和NSGA2算法相結(jié)合的求解方法,將多目標優(yōu)化問題分成連續(xù)優(yōu)化和離散優(yōu)化兩部分,能夠通過一次運行得到多個Pareto最優(yōu)解,克服了以往算法中多次運行才能得到一組近似Pareto最優(yōu)解且結(jié)果可能出現(xiàn)不一致的缺陷。最后,將多端柔性直流輸電系統(tǒng)的潮流優(yōu)化結(jié)果結(jié)合廣義下垂控制方式,提出了基于最優(yōu)潮流的多端柔性直流輸電系統(tǒng)控制策略。結(jié)合風(fēng)功率預(yù)測數(shù)據(jù),利用該控制策略對各換流站控制系數(shù)進行周期性的調(diào)整,對系統(tǒng)運行進行優(yōu)化,潮流優(yōu)化及仿真分析結(jié)果驗證本文所提方法的有效性和可行性。
[Abstract]:Multi-terminal flexible DC transmission is an important part of smart grid, and it is also a hot research topic. On the one hand, in order to ensure the safe and stable operation of multi-terminal flexible direct current transmission system, the coordinated control strategy needs to be deeply studied. On the other hand, the popularization and application of multi-terminal flexible direct current transmission system also need to have good economy, and it is necessary to optimize its network operation. In this paper, the control strategy of multi-terminal flexible direct current transmission system with voltage source converter based on optimal power flow is studied, which has certain theoretical significance and engineering application value. In this paper, the structure and principle of the flexible direct current transmission system are analyzed, and the system-level control strategy and converter station level control method of the multi-terminal flexible direct current transmission system are studied, and according to the characteristics of these control strategies, The control strategy of voltage source converter is switched seamlessly by generalized droop control. Then, the optimal power flow of multi-terminal flexible direct current transmission system is studied, and a multi-objective power flow optimization model is proposed, which takes into account the reduction of active power loss, the reduction of system voltage deviation and the increase of system static voltage stability margin. On this basis, a solution based on interior point method and NSGA2 algorithm is proposed. The multi-objective optimization problem is divided into two parts: continuous optimization and discrete optimization, and multiple Pareto optimal solutions can be obtained by one run. It overcomes the defect that the previous algorithm can get a set of approximate Pareto optimal solutions and the results may be inconsistent. Finally, combining the power flow optimization results of multi-terminal flexible direct current transmission system with the generalized droop control method, the control strategy of multi-terminal flexible direct current transmission system based on optimal power flow is proposed. Combined with wind power prediction data, the control coefficient of each converter station is adjusted periodically by using the control strategy, and the system operation is optimized. The results of power flow optimization and simulation analysis verify the effectiveness and feasibility of the proposed method.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM721.1

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