【摘要】：隨著分布式發(fā)電技術(shù)、多端直流輸電技術(shù)的發(fā)展以及新型直流設(shè)備的技術(shù)突破,直流配電網(wǎng)得到了越來越多的關(guān)注和研究。與交流配電網(wǎng)相比,直流配電網(wǎng)能夠減少大量的DC/AC換流環(huán)節(jié),降低換流站的建設(shè)和運(yùn)行成本,不存在無功環(huán)流、頻率和功角穩(wěn)定性等問題,可以有效解決交流配電網(wǎng)中存在的三相不平衡、電網(wǎng)諧波等一系列電能質(zhì)量問題。本文針對(duì)直流配電網(wǎng)的電壓調(diào)整控制以及綜合調(diào)壓控制策略進(jìn)行深入研究,主要研究內(nèi)容如下:(1)分析了直流配電網(wǎng)的典型拓?fù)浣Y(jié)構(gòu)和電壓源換流器(VSC)的基本原理,并建立了VSC的穩(wěn)態(tài)數(shù)學(xué)模型。在此基礎(chǔ)上,分析了直流配電系統(tǒng)的分層控制系統(tǒng),并對(duì)包括外環(huán)控制器與內(nèi)環(huán)控制器的換流站級(jí)控制器進(jìn)行了設(shè)計(jì),為直流配電網(wǎng)的電壓控制策略的設(shè)計(jì)奠定基礎(chǔ)。(2)分析了直流配電網(wǎng)采用直流電壓下垂控制的原理及優(yōu)缺點(diǎn),針對(duì)直流電壓下垂控制存在的電壓偏差問題,提出了一種附加直流電壓偏差補(bǔ)償控制的改進(jìn)直流電壓下垂控制策略,以減小直流電壓偏差和提高直流配電網(wǎng)的可靠性。在仿真平臺(tái)上搭建了兩端直流配電網(wǎng)和三端環(huán)狀直流配電網(wǎng)模型,進(jìn)行直流配電網(wǎng)穩(wěn)態(tài)和暫態(tài)運(yùn)行仿真分析,驗(yàn)證了所提控制策略的有效性。(3)研究了直流配電網(wǎng)的綜合調(diào)壓控制策略,設(shè)計(jì)了直流配電網(wǎng)的電壓控制體系,對(duì)直流配電網(wǎng)的一次調(diào)壓和二次調(diào)壓進(jìn)行了詳細(xì)的分析和研究,一次調(diào)壓采用基于U-P控制特性的多端直流電壓下垂控制,二次調(diào)壓針對(duì)不同的優(yōu)化目標(biāo):電壓優(yōu)化、網(wǎng)損優(yōu)化、電壓和網(wǎng)損綜合優(yōu)化,分別提出了基于電壓優(yōu)化算法的綜合調(diào)壓控制策略、基于網(wǎng)損優(yōu)化算法的綜合調(diào)壓控制策略和直流配電網(wǎng)的電壓和網(wǎng)損綜合優(yōu)化控制策略。為未來大規(guī)模直流配電網(wǎng)的電壓控制和優(yōu)化運(yùn)行提供參考。(4)搭建了直流配電網(wǎng)的綜合調(diào)壓仿真模型,對(duì)本文提出的基于電壓優(yōu)化算法的綜合調(diào)壓控制策略、基于網(wǎng)損優(yōu)化算法的綜合調(diào)壓控制策略和直流配電網(wǎng)的電壓和網(wǎng)損綜合優(yōu)化控制策略分別進(jìn)行了仿真分析,驗(yàn)證了所提綜合調(diào)壓控制策略的有效性。
[Abstract]:With the development of distributed generation technology, multi-terminal DC transmission technology and the breakthrough of new DC equipment, DC distribution network has been paid more and more attention and research. Compared with AC distribution network, DC distribution network can reduce a lot of DC/AC commutation links, reduce the construction and operation cost of converter station, and there are no problems such as reactive circulation, frequency and power angle stability, etc. It can effectively solve a series of power quality problems such as three-phase imbalance and harmonic in AC distribution network. The main contents of this paper are as follows: (1) the typical topology of DC distribution network and the basic principle of voltage source converter (VSC) are analyzed. The steady mathematical model of VSC is established. On this basis, the hierarchical control system of DC distribution system is analyzed, and the converter station controller including outer loop controller and inner loop controller is designed. It lays a foundation for the design of voltage control strategy of DC distribution network. (2) the principle, advantages and disadvantages of DC voltage droop control are analyzed, and the voltage deviation of DC voltage droop control is analyzed. An improved DC voltage sag control strategy is proposed to reduce the DC voltage deviation and improve the reliability of the DC distribution network. Two end DC distribution network and three terminal ring DC distribution network model are built on the simulation platform, and the steady and transient operation simulation analysis of DC distribution network is carried out. The effectiveness of the proposed control strategy is verified. (3) the integrated voltage control strategy of DC distribution network is studied, the voltage control system of DC distribution network is designed, and the primary and secondary voltage regulation of DC distribution network is analyzed and studied in detail. The primary voltage regulation adopts multi-terminal DC voltage droop control based on U-P control characteristic. The secondary voltage regulation aims at different optimization objectives: voltage optimization, network loss optimization, voltage and network loss synthesis optimization. The integrated voltage control strategy based on the voltage optimization algorithm, the integrated voltage regulation control strategy based on the network loss optimization algorithm and the integrated voltage and network loss control strategy of the DC distribution network are proposed respectively. It provides a reference for voltage control and optimal operation of large-scale DC distribution network in the future. (4) the integrated voltage regulation simulation model of DC distribution network is built, and the integrated voltage control strategy based on voltage optimization algorithm is proposed in this paper. The integrated voltage regulation control strategy based on the network loss optimization algorithm and the voltage and network loss integrated optimal control strategy of the DC distribution network are simulated and analyzed respectively to verify the effectiveness of the proposed integrated voltage regulation control strategy.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM721.1;TM714.2

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