海上風(fēng)電通過柔性直流輸電系統(tǒng)并網(wǎng)的控制策略研究
發(fā)布時間：2018-11-22 09:42
【摘要】：近年來,雙饋式感應(yīng)發(fā)電機(jī)(DFIG)越來越多地應(yīng)用于海上風(fēng)力發(fā)電系統(tǒng)中。而柔性直流輸電系統(tǒng)(VSC-HVDC)又是遠(yuǎn)距離海上風(fēng)電并網(wǎng)的典型結(jié)構(gòu)。本文針對海上風(fēng)電系統(tǒng)通過VSC-HVDC送出的控制策略做了以下幾個方面的研究： (1)搭建了風(fēng)電場由VSC-HVDC送出的數(shù)字仿真平臺。風(fēng)電場由基于DFIG的風(fēng)力機(jī)組成,其中包含有風(fēng)力機(jī)組模型,DFIG換流器模型以及槳矩角控制系統(tǒng)。對VSC-HVDC系統(tǒng)而言,風(fēng)場側(cè)換流器(WFVSC)主要控制海上風(fēng)電交流系統(tǒng)的電壓幅值和電網(wǎng)頻率,以穩(wěn)定交流電壓；而網(wǎng)側(cè)換流器(GSVSC)控制直流電壓和與交流系統(tǒng)交換的無功功率。 (2)海上風(fēng)電由VSC-HVDC送出系統(tǒng)是一個“低慣量”系統(tǒng)。故給出利用直流電容和DFIG轉(zhuǎn)子動能去模擬同步電機(jī)慣量的協(xié)同控制策略。GSVSC通過直流電壓滑差控制,在電網(wǎng)擾動下,直流電容將吸收或釋放能量。兩端VSC交流系統(tǒng)頻率將通過WFVSC變頻控制實(shí)現(xiàn)人工耦合,這樣省去兩端換流站之間的通訊。為響應(yīng)WFVSC頻率變化,DFIG功率控制器將調(diào)整功率指令值,使轉(zhuǎn)子轉(zhuǎn)速相應(yīng)變化。通過一系列協(xié)同控制,海上風(fēng)電場將參與電力系統(tǒng)頻率控制。在允許的直流電壓變化范圍內(nèi),該協(xié)同控制策略可提供大范圍的慣量,增加系統(tǒng)穩(wěn)定性。 (3)分析了直流電容和GSVSC換流器電流控制器閾值對故障直流電壓的影響。提出了海上風(fēng)電由VSC-HVDC送出的故障穿越策略：當(dāng)GSVSC側(cè)系統(tǒng)故障,GSVSC首先處于限電流控制。然后,WFVSC感受到升高的直流電壓,將其升高直流電壓信號轉(zhuǎn)化成升高的送端交流系統(tǒng)頻率。最后,DFIG在感受到升高交流系統(tǒng)頻率后,通過自身的降功率控制策略降低其發(fā)出的有功功率。并分析了利用頻率偏差控制和頻率-功率自定義曲線控制的DFIG自動降功率特性。
[Abstract]:In recent years, doubly-fed induction generator (DFIG) has been used more and more in offshore wind power system. Flexible direct current transmission system (VSC-HVDC) is a typical structure of wind power grid. In this paper, the control strategy of offshore wind power system through VSC-HVDC is studied in the following aspects: (1) the digital simulation platform of wind farm sent out by VSC-HVDC is built. The wind farm consists of wind turbine based on DFIG, including wind turbine model, DFIG converter model and propeller moment angle control system. For the VSC-HVDC system, the wind field side converter (WFVSC) mainly controls the voltage amplitude and the power network frequency of the offshore wind power AC system to stabilize the AC voltage. The grid side converter (GSVSC) controls DC voltage and reactive power exchange with AC system. (2) Offshore wind power supply system by VSC-HVDC is a "low inertia" system. Therefore, a cooperative control strategy using DC capacitance and DFIG rotor kinetic energy to simulate the inertia of synchronous motor is presented. The DC capacitance absorbs or releases the energy under the disturbance of the power grid through the DC voltage slip control. The frequency of VSC AC system at both ends will be manually coupled by WFVSC frequency conversion control, thus eliminating the communication between the two end converter stations. In response to the WFVSC frequency change, the DFIG power controller will adjust the power instruction value to make the rotor speed change accordingly. Through a series of cooperative control, offshore wind farm will participate in the frequency control of power system. Within the allowable DC voltage range, the cooperative control strategy can provide a wide range of inertia and increase the stability of the system. (3) the influence of DC capacitance and current controller threshold of GSVSC converter on DC voltage of fault is analyzed. A fault traversing strategy for offshore wind power from VSC-HVDC is proposed: when the GSVSC side system fails, the GSVSC is at the limit current control first. Then, the WFVSC senses the rising DC voltage and converts it into a higher AC system frequency. Finally, DFIG reduces the active power output by its own power reduction strategy after sensing the increase of AC system frequency. The automatic power reduction characteristics of DFIG using frequency deviation control and frequency-power custom curve control are analyzed.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM721.1
本文編號：2348905
[Abstract]:In recent years, doubly-fed induction generator (DFIG) has been used more and more in offshore wind power system. Flexible direct current transmission system (VSC-HVDC) is a typical structure of wind power grid. In this paper, the control strategy of offshore wind power system through VSC-HVDC is studied in the following aspects: (1) the digital simulation platform of wind farm sent out by VSC-HVDC is built. The wind farm consists of wind turbine based on DFIG, including wind turbine model, DFIG converter model and propeller moment angle control system. For the VSC-HVDC system, the wind field side converter (WFVSC) mainly controls the voltage amplitude and the power network frequency of the offshore wind power AC system to stabilize the AC voltage. The grid side converter (GSVSC) controls DC voltage and reactive power exchange with AC system. (2) Offshore wind power supply system by VSC-HVDC is a "low inertia" system. Therefore, a cooperative control strategy using DC capacitance and DFIG rotor kinetic energy to simulate the inertia of synchronous motor is presented. The DC capacitance absorbs or releases the energy under the disturbance of the power grid through the DC voltage slip control. The frequency of VSC AC system at both ends will be manually coupled by WFVSC frequency conversion control, thus eliminating the communication between the two end converter stations. In response to the WFVSC frequency change, the DFIG power controller will adjust the power instruction value to make the rotor speed change accordingly. Through a series of cooperative control, offshore wind farm will participate in the frequency control of power system. Within the allowable DC voltage range, the cooperative control strategy can provide a wide range of inertia and increase the stability of the system. (3) the influence of DC capacitance and current controller threshold of GSVSC converter on DC voltage of fault is analyzed. A fault traversing strategy for offshore wind power from VSC-HVDC is proposed: when the GSVSC side system fails, the GSVSC is at the limit current control first. Then, the WFVSC senses the rising DC voltage and converts it into a higher AC system frequency. Finally, DFIG reduces the active power output by its own power reduction strategy after sensing the increase of AC system frequency. The automatic power reduction characteristics of DFIG using frequency deviation control and frequency-power custom curve control are analyzed.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM721.1
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，本文編號：2348905
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