本文選題：交直流混合 + 配電網(wǎng)��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：近年來,隨著社會經(jīng)濟的高速發(fā)展和現(xiàn)代城市的快速建設(shè),城市配電網(wǎng)中負(fù)荷的大小和種類不斷增加,傳統(tǒng)交流配電網(wǎng)面臨著供電質(zhì)量下降、供電走廊緊張、換流過程繁多等諸多問題。與此同時,具有提高供電容量、改善供電質(zhì)量、便于分布式電源及直流負(fù)荷并網(wǎng)等眾多優(yōu)勢的直流配電網(wǎng)受到了世界范圍內(nèi)專家學(xué)者的關(guān)注,在傳統(tǒng)的交流配電網(wǎng)上發(fā)展優(yōu)點眾多的直流配電已經(jīng)成為了未來配電網(wǎng)建設(shè)的趨勢。因此,對兼具交流配電基礎(chǔ)和直流配電優(yōu)勢的交直流混合配電網(wǎng)的研究具有很高的現(xiàn)實意義和應(yīng)用價值。本文以傳統(tǒng)“手拉手”接線的交流中壓配電網(wǎng)為基礎(chǔ),提出了一種新的交直流混合配電網(wǎng)的網(wǎng)架結(jié)構(gòu),利用柔性直流技術(shù)在交流配網(wǎng)中構(gòu)建直流環(huán)節(jié),在具備直流配電網(wǎng)優(yōu)點的同時也兼顧了交流配電網(wǎng)的基礎(chǔ)。分析表明,交直流混合配電網(wǎng)能夠有效提高配電網(wǎng)的整體供電質(zhì)量,減少配電網(wǎng)中的換流過程,節(jié)省供電線路走廊。隨后,本文從一次設(shè)備投資和運行損耗兩方面對交直流混合配電網(wǎng)進行了經(jīng)濟性分析,并以遼寧省某供電區(qū)域作為實例,將交直流混合網(wǎng)改造與增建交流配電網(wǎng)和增建直流配電網(wǎng)進行了經(jīng)濟性對比。其中,一次設(shè)備投資主要包括換流站與變電站、線路電纜、斷路器、變壓器及整流逆變器;運行損耗主要包括變電損耗、換流損耗以及線路傳輸損耗。對比結(jié)果顯示,當(dāng)配電網(wǎng)運行年數(shù)較長時,交直流混合配電網(wǎng)因具有更低的運行損耗而具有更好的經(jīng)濟性。之后,本文在分析了已有的應(yīng)用于多端直流系統(tǒng)的眾多VSC控制策略之后,以綜合性能較優(yōu)的組合控制策略為基礎(chǔ),提出了新的改進組合控制策略。分析表明,改進組合控制策略能夠在直流電壓主控VSC故障之后,將直流母線電壓控制在更接近于額定電壓的水平,并使之具有更高的穩(wěn)定性,因而比已有的組合控制具有更佳的控制性能。最后,本文利用Matlab/Simulink仿真平臺搭建了交直流混合配電網(wǎng)的簡化仿真模型,通過設(shè)置不同的系統(tǒng)狀態(tài)對模型進行了仿真運行分析,對本文提出的交直流混合配電網(wǎng)的網(wǎng)架結(jié)構(gòu)和控制策略的可行性進行研究。仿真結(jié)果表明,與交流線路相連的VSC可以通過提供適當(dāng)?shù)臒o功補償來改善交流線路的電壓分布和供電質(zhì)量,改進組合控制策略在正常運行以及直流電壓主控VSC故障時,均能對直流系統(tǒng)的母線電壓和功率平衡進行良好的控制。
[Abstract]:In recent years, with the rapid development of social economy and the rapid construction of modern cities, the size and variety of load in urban distribution network is increasing, the traditional AC distribution network is facing the decline of power supply quality, power supply corridor is tight. There are many problems in the commutation process. At the same time, the DC distribution network, which has many advantages, such as increasing the power supply capacity, improving the power supply quality and facilitating the distribution of power and DC load connected to the grid, has attracted the attention of experts and scholars all over the world. The development of DC distribution with many advantages on the traditional AC distribution network has become the trend of distribution network construction in the future. Therefore, the study of AC / DC hybrid distribution network with both AC and DC distribution advantages has high practical significance and application value. In this paper, a new AC / DC hybrid distribution network is proposed based on the traditional "hand-held" AC / MV distribution network. The flexible DC technology is used to construct the DC link in the AC / DC distribution network. At the same time, the basis of AC distribution network is also taken into account. The analysis shows that the AC / DC hybrid distribution network can effectively improve the overall power supply quality of the distribution network, reduce the commutation process in the distribution network, and save the power supply line corridor. Then, this paper analyzes the economy of AC / DC hybrid distribution network from two aspects of primary equipment investment and operation loss, and takes a power supply area of Liaoning Province as an example. The economic comparison between the AC / DC hybrid network and the additional AC distribution network and the additional DC distribution network is carried out. Among them, primary equipment investment mainly includes converter station and substation, line cable, circuit breaker, transformer and rectifier inverter, and operation loss mainly includes transformer loss, commutation loss and line transmission loss. The comparison results show that the AC / DC hybrid distribution network has better economy because of its lower operating loss when the number of years of operation is longer. Then, after analyzing the existing VSC control strategies for multi-terminal DC systems, a new improved combinatorial control strategy is proposed based on the combinatorial control strategy with better comprehensive performance. The analysis shows that the improved combined control strategy can control the DC bus voltage closer to the rated voltage level after the DC voltage main control VSC fault, and make it more stable. Therefore, it has better control performance than the existing combinatorial control. Finally, the simplified simulation model of AC / DC hybrid distribution network is built by using Matlab / Simulink simulation platform, and the simulation operation of the model is analyzed by setting different system states. The feasibility of the structure and control strategy of AC / DC hybrid distribution network proposed in this paper is studied. The simulation results show that the VSC connected with AC circuit can improve the voltage distribution and power supply quality by providing appropriate reactive power compensation. The bus voltage and power balance of DC system can be controlled well.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM721.3

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本文編號：1996273