本文選題：分布式電源　切入點(diǎn)：交(直)流配電網(wǎng)　出處：《上海電力學(xué)院》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：分布式電源的高效、環(huán)保等特點(diǎn)促使其在電力系統(tǒng)中的分布越來越廣泛�，F(xiàn)代配電網(wǎng)具有適宜于分布式電源接入、供電質(zhì)量高,減少城市用電緊張等特點(diǎn),發(fā)展現(xiàn)代配電網(wǎng)將是城市電網(wǎng)的必然要求。由于分布式電源出力的隨機(jī)性和波動(dòng)性,其接入現(xiàn)代配電網(wǎng)必然造成各節(jié)點(diǎn)電壓的波動(dòng),節(jié)點(diǎn)電壓作為衡量配電網(wǎng)電壓質(zhì)量的重要指標(biāo),因此對(duì)電壓控制的研究就顯得尤為關(guān)鍵�，F(xiàn)代配電網(wǎng)內(nèi)含DG的種類多,在進(jìn)行潮流分析過程中,對(duì)于不同種類的節(jié)點(diǎn)采用恰當(dāng)?shù)姆椒ㄏ騊Q節(jié)點(diǎn)轉(zhuǎn)換,因而需要對(duì)不同種類的分布式電源的輸出功率進(jìn)行建模并確立其節(jié)點(diǎn)類型,便于計(jì)算;研究含多種類型的交流配電網(wǎng)優(yōu)化模型,采用改進(jìn)遺傳算法對(duì)模型求解,采用隨機(jī)潮流算法對(duì)系統(tǒng)潮流進(jìn)行求解,算例分析表明本文優(yōu)化模型能減少配電網(wǎng)網(wǎng)損,提高配電網(wǎng)運(yùn)行的經(jīng)濟(jì)性。對(duì)直流配電網(wǎng)的運(yùn)行模式、控制層次、控制方式進(jìn)行了分析。指出VSC是連接直流配電網(wǎng)與外部電網(wǎng)的重要設(shè)備,控制其輸出功率穩(wěn)定對(duì)于直流配電網(wǎng)的穩(wěn)定運(yùn)行有重要意義。針對(duì)其不同運(yùn)行模式下VSC的控制問題,提出了適用于直流配電網(wǎng)的電壓協(xié)調(diào)控制方式,提出的將帶裕度的電壓控制方式與功率電壓下垂控制方式相結(jié)合的電壓協(xié)調(diào)控制方式結(jié)構(gòu)合理,層次清晰。在DG與負(fù)荷的功率發(fā)生波動(dòng)時(shí),能將母線電壓控制在有效范圍內(nèi),保證系統(tǒng)的穩(wěn)定運(yùn)行;在直流配電網(wǎng)運(yùn)行模式發(fā)生改變時(shí),換流站控制模式之間能夠平滑切換,不會(huì)對(duì)母線電壓帶來沖擊。所提協(xié)調(diào)控制模式能夠快速響應(yīng)系統(tǒng)功率的變化,提高了系統(tǒng)的穩(wěn)定性;直流配電網(wǎng)內(nèi)無感抗、容抗,潮流分析比交流配電網(wǎng)簡單,研究了基于Newton-Raphson法的直流配電網(wǎng)潮流分析,并將其用于后續(xù)的直流配電網(wǎng)研究中。針對(duì)大量分布式電源并入直流配電網(wǎng)后的電壓波動(dòng)問題,提出一種適用于直流配電網(wǎng)的雙階段電壓控制方式,第一階段通過電壓源換流站來控制全網(wǎng)的電壓水平,第二階段通過優(yōu)化DG的有功出力對(duì)系統(tǒng)各節(jié)點(diǎn)電壓進(jìn)行調(diào)整,且雙階段的控制結(jié)果相互反饋,共同實(shí)現(xiàn)對(duì)直流配電網(wǎng)各節(jié)點(diǎn)電壓的控制。算例分析表明,本文所提的雙階段控制方式能有效適應(yīng)大量DG的接入,能有效控制直流配電網(wǎng)各節(jié)點(diǎn)的電壓,保證系統(tǒng)安全穩(wěn)定運(yùn)行。
[Abstract]:The high efficiency and environmental protection of distributed power make it more and more widely distributed in power system. Modern distribution network is suitable for access to distributed power supply, high quality of power supply, reduction of power shortage in cities, and so on. The development of modern distribution network will be the inevitable requirement of urban power grid. Because of the randomness and fluctuation of distributed power generation, its connection to modern distribution network will inevitably cause voltage fluctuation of each node. Node voltage is an important index to measure the voltage quality of distribution network, so the research on voltage control is particularly important. There are many kinds of DG in modern distribution network, so in the process of power flow analysis, For different kinds of nodes, it is necessary to model the output power of different kinds of distributed power supply and establish the type of nodes, so it is convenient to calculate because the appropriate method is adopted to convert to PQ nodes. The optimization model of AC distribution network with various types is studied. The improved genetic algorithm is used to solve the model, and the stochastic power flow algorithm is used to solve the power flow of the system. The example analysis shows that the optimization model in this paper can reduce the network loss of distribution network. The operation mode, control level and control mode of DC distribution network are analyzed. It is pointed out that VSC is an important equipment to connect DC distribution network with external network. It is very important to control the output power stability for the stable operation of DC distribution network. Aiming at the control problem of VSC in different operation modes, a voltage coordinated control mode suitable for DC distribution network is proposed. The proposed voltage coordination control method, which combines the voltage control with margin and the power voltage droop control, has a reasonable structure and clear level. When the power of DG and load fluctuates, the bus voltage can be controlled within an effective range. Ensure the stable operation of the system, when the operation mode of DC distribution network changes, the converter station control mode can be smoothly switched, without impact on the bus voltage. The proposed coordinated control mode can quickly respond to the system power changes. The stability of the system is improved, no reactance, capacitive reactance, power flow analysis in DC distribution network is simpler than that in AC distribution network, the power flow analysis of DC distribution network based on Newton-Raphson method is studied. And it is used in the subsequent research of DC distribution network. Aiming at the voltage fluctuation problem after a large number of distributed generation is incorporated into DC distribution network, a two-stage voltage control method suitable for DC distribution network is proposed. In the first stage, the voltage level of the whole network is controlled by the voltage source converter station. In the second stage, the voltage of each node of the system is adjusted by optimizing the active power output of the DG, and the results of the two-stage control are feedback to each other. The calculation example shows that the two-stage control method proposed in this paper can effectively adapt to a large number of DG access, and can effectively control the voltage of each node in DC distribution network. Ensure safe and stable operation of the system.
【學(xué)位授予單位】：上海電力學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM714.2

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本文編號(hào)：1570262