風(fēng)電場直流并網(wǎng)系統(tǒng)靜態(tài)電壓穩(wěn)定分析方法研究
發(fā)布時間：2018-09-06 06:47
【摘要】：傳統(tǒng)能源的日益枯竭及其帶來的全球環(huán)境惡化,使得具有可再生、無污染、儲量豐富、分布廣等優(yōu)點的風(fēng)能備受各國重視。而我國主要的風(fēng)力資源遠(yuǎn)離負(fù)荷中心,需并網(wǎng)遠(yuǎn)距離輸送到負(fù)荷中心。電壓源型的高壓直流輸電(VSC-HVDC)與交流輸電和傳統(tǒng)直流輸電相比,有諸多優(yōu)點,比如具有獨立控制有功和無功、可為無源網(wǎng)絡(luò)供電、占地面積小、可發(fā)出無功、在分散性的小型可再生能源發(fā)電并網(wǎng)方面具有經(jīng)濟(jì)性等,因此,VSC-HVDC更適合風(fēng)電并網(wǎng)。而風(fēng)電場規(guī)模的日益擴(kuò)大使得風(fēng)電并網(wǎng)對系統(tǒng)電壓穩(wěn)定性的影響越來越嚴(yán)重,因此,很有必要分析基于VSC-HVDC的風(fēng)電并網(wǎng)系統(tǒng)的靜態(tài)電壓穩(wěn)定性。首先,針對現(xiàn)有交直流聯(lián)合系統(tǒng)潮流統(tǒng)一迭代法對純交流程序繼承性差、程序編寫工作量大以及交替迭代算法沒有考慮交、直流之間的耦合而導(dǎo)致收斂性差、精度低的缺陷,結(jié)合直流網(wǎng)絡(luò)方程及VSC控制方程實現(xiàn)交流、直流子系統(tǒng)完全解耦及獨立求解,從而形成了一種AC/VSC-MTDC混聯(lián)系統(tǒng)潮流解耦快速算法。其次,針對線路換相換流器(LCC)與電壓源換流器(VSC)的結(jié)合成的混合直流輸電系統(tǒng)特別適合多風(fēng)電場同時并網(wǎng),這樣就形成了交流/混合多端直流輸電(AC/Hybrid-MTDC)系統(tǒng)。論文在實現(xiàn)交流、直流子系統(tǒng)解耦的基礎(chǔ)上,通過在交流子系統(tǒng)雅可比矩陣中分別追加了LCC和VSC的耦合項來獨立、交替求解交流子系統(tǒng)、直流子系統(tǒng)潮流,算法收斂性好、計算速度快。然后,論文研究了AC/VSC-MTDC混聯(lián)系統(tǒng)的靜態(tài)電壓穩(wěn)定性分析方法。提出以AC/VSC-HVDC混合系統(tǒng)潮流解耦快速算法為基礎(chǔ)、局部參數(shù)化的連續(xù)潮流算法來分析AC/VSC-MTDC混聯(lián)系統(tǒng)靜態(tài)電壓穩(wěn)定性。算法計算速度快,且能夠方便計及VSC-MTDC系統(tǒng)運(yùn)行方式轉(zhuǎn)換。最后,論文針對傳統(tǒng)連續(xù)潮流算法分析風(fēng)電場直流并網(wǎng)系統(tǒng)靜態(tài)電壓穩(wěn)定過程中,在移去直流系統(tǒng)后出現(xiàn)孤立風(fēng)電場交流節(jié)點,無法進(jìn)行迭代這一現(xiàn)象,提出將風(fēng)電場等效成變PQ節(jié)點,在建立節(jié)點無功功率與節(jié)點電壓、有功功率函數(shù)關(guān)系基礎(chǔ)上,應(yīng)用前述AC/VSC-MTDC混聯(lián)系統(tǒng)靜態(tài)電壓穩(wěn)定性分析方法來分析基于VSC-HVDC的風(fēng)電場并網(wǎng)系統(tǒng)靜態(tài)電壓穩(wěn)定性分析。論文提出的研究方法對AC/VSC-MTDC混合系統(tǒng)潮流計算、靜態(tài)電壓穩(wěn)定性分析、AC/Hybrid-MTDC潮流計算以及基于AC/VSC-HVDC的風(fēng)電場并網(wǎng)系統(tǒng)靜態(tài)電壓穩(wěn)定分析方法都具有較好的參考價值。
[Abstract]:With the depletion of traditional energy and the deterioration of the global environment, wind energy, which is renewable, pollution-free, rich in reserves and widely distributed, has attracted much attention. The main wind resources in China are far away from the load center and need to be transported to the load center. Compared with AC transmission and traditional DC transmission, voltage source HVDC transmission (VSC-HVDC) has many advantages, such as independent control of active and reactive power, power supply for passive network, small area and reactive power. So VSC-HVDC is more suitable for wind power grid. With the increasing scale of wind farm, the influence of wind power grid connection on system voltage stability is becoming more and more serious. Therefore, it is necessary to analyze the static voltage stability of wind power grid connected system based on VSC-HVDC. First of all, the current unified iterative method of AC / DC power flow has poor inheritance to pure AC program, large program writing workload and alternating iteration algorithm without considering AC, and the coupling between DC and DC leads to poor convergence and low precision. Combined with DC network equation and VSC control equation, DC subsystem is completely decoupled and independently solved, thus a fast algorithm for power flow decoupling of AC/VSC-MTDC hybrid system is formed. Secondly, the hybrid DC transmission system based on the combination of the line commutator (LCC) and the voltage source converter (VSC) is especially suitable for the simultaneous grid connection of multi-wind farms, thus the AC / hybrid multi-terminal direct current transmission (AC/Hybrid-MTDC) system is formed. Based on the decoupling of AC and DC subsystems, the coupling terms of LCC and VSC are added to the Jacobian matrix of AC subsystem separately to solve the AC subsystem alternately, DC subsystem power flow and convergence of algorithm are good. The calculation speed is fast. Then, the static voltage stability analysis method of AC/VSC-MTDC hybrid system is studied. Based on the fast power flow decoupling algorithm for AC/VSC-HVDC hybrid systems, a locally parameterized continuous power flow algorithm is proposed to analyze the static voltage stability of AC/VSC-MTDC hybrid systems. The algorithm is fast and convenient to take into account the operation mode conversion of VSC-MTDC system. Finally, aiming at the traditional continuous power flow algorithm, this paper analyzes the static voltage stability process of DC grid connected system of wind farm. After removing DC system, the isolated AC node of wind farm can not be iterated. The wind farm is equivalent to a variable PQ node. The relationship between reactive power, voltage and active power function of the node is established. The static voltage stability analysis of wind farm grid-connected system based on VSC-HVDC is analyzed by using the AC/VSC-MTDC hybrid system static voltage stability analysis method mentioned above. The research method proposed in this paper has good reference value for power flow calculation of AC/VSC-MTDC hybrid system static voltage stability analysis AC / hybrid-MTDC power flow calculation and static voltage stability analysis method for wind farm grid-connected system based on AC/VSC-HVDC.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM614;TM712
本文編號：2225570
[Abstract]:With the depletion of traditional energy and the deterioration of the global environment, wind energy, which is renewable, pollution-free, rich in reserves and widely distributed, has attracted much attention. The main wind resources in China are far away from the load center and need to be transported to the load center. Compared with AC transmission and traditional DC transmission, voltage source HVDC transmission (VSC-HVDC) has many advantages, such as independent control of active and reactive power, power supply for passive network, small area and reactive power. So VSC-HVDC is more suitable for wind power grid. With the increasing scale of wind farm, the influence of wind power grid connection on system voltage stability is becoming more and more serious. Therefore, it is necessary to analyze the static voltage stability of wind power grid connected system based on VSC-HVDC. First of all, the current unified iterative method of AC / DC power flow has poor inheritance to pure AC program, large program writing workload and alternating iteration algorithm without considering AC, and the coupling between DC and DC leads to poor convergence and low precision. Combined with DC network equation and VSC control equation, DC subsystem is completely decoupled and independently solved, thus a fast algorithm for power flow decoupling of AC/VSC-MTDC hybrid system is formed. Secondly, the hybrid DC transmission system based on the combination of the line commutator (LCC) and the voltage source converter (VSC) is especially suitable for the simultaneous grid connection of multi-wind farms, thus the AC / hybrid multi-terminal direct current transmission (AC/Hybrid-MTDC) system is formed. Based on the decoupling of AC and DC subsystems, the coupling terms of LCC and VSC are added to the Jacobian matrix of AC subsystem separately to solve the AC subsystem alternately, DC subsystem power flow and convergence of algorithm are good. The calculation speed is fast. Then, the static voltage stability analysis method of AC/VSC-MTDC hybrid system is studied. Based on the fast power flow decoupling algorithm for AC/VSC-HVDC hybrid systems, a locally parameterized continuous power flow algorithm is proposed to analyze the static voltage stability of AC/VSC-MTDC hybrid systems. The algorithm is fast and convenient to take into account the operation mode conversion of VSC-MTDC system. Finally, aiming at the traditional continuous power flow algorithm, this paper analyzes the static voltage stability process of DC grid connected system of wind farm. After removing DC system, the isolated AC node of wind farm can not be iterated. The wind farm is equivalent to a variable PQ node. The relationship between reactive power, voltage and active power function of the node is established. The static voltage stability analysis of wind farm grid-connected system based on VSC-HVDC is analyzed by using the AC/VSC-MTDC hybrid system static voltage stability analysis method mentioned above. The research method proposed in this paper has good reference value for power flow calculation of AC/VSC-MTDC hybrid system static voltage stability analysis AC / hybrid-MTDC power flow calculation and static voltage stability analysis method for wind farm grid-connected system based on AC/VSC-HVDC.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM614;TM712
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，本文編號：2225570
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