提高頻率穩(wěn)定性的風(fēng)儲聯(lián)合系統(tǒng)控制策略研究
發(fā)布時(shí)間：2018-10-22 07:09
【摘要】：風(fēng)力發(fā)電具有隨機(jī)性與波動性,風(fēng)電場并網(wǎng)后對系統(tǒng)頻率造成波動,隨著風(fēng)電滲透率在電力系統(tǒng)中的不斷增大,風(fēng)電并網(wǎng)對電力系統(tǒng)頻率的影響日益顯著。目前風(fēng)電機(jī)組普遍采用最優(yōu)功率運(yùn)行模式,不能參與電網(wǎng)調(diào)頻調(diào)度,而采用降載運(yùn)行留有有功余量勢必會損失風(fēng)電機(jī)組發(fā)電效率,如何在保證風(fēng)電經(jīng)濟(jì)運(yùn)行的前提下最大程度發(fā)揮其調(diào)頻能力,成為建立電網(wǎng)友好型風(fēng)電場的關(guān)鍵問題。針對該問題,本文研究風(fēng)電機(jī)組調(diào)頻有功裕度、風(fēng)速閾值和儲能容量配置整定方法,利用風(fēng)電機(jī)組和儲能系統(tǒng)在功率傳輸與調(diào)頻能力上的優(yōu)勢互補(bǔ),采用風(fēng)儲聯(lián)合調(diào)頻控制方法,提高電力系統(tǒng)頻率穩(wěn)定性。首先,根據(jù)雙饋風(fēng)力發(fā)電機(jī)三相靜止坐標(biāo)系與兩相旋轉(zhuǎn)坐標(biāo)系下的數(shù)學(xué)模型,完成風(fēng)力發(fā)電系統(tǒng)有功、無功功率解耦控制,對雙饋風(fēng)力發(fā)電機(jī)建模。利用等值法建立風(fēng)電場動態(tài)聚合模型。根據(jù)電池儲能系統(tǒng)結(jié)構(gòu)、數(shù)學(xué)模型及工作原理進(jìn)行建模,為仿真分析奠定基礎(chǔ)。其次,提出計(jì)及風(fēng)速波動區(qū)間的風(fēng)儲聯(lián)合調(diào)頻控制策略。在低風(fēng)速區(qū),風(fēng)電機(jī)組按最優(yōu)功率模式運(yùn)行,由儲能系統(tǒng)提供調(diào)頻備用;在高風(fēng)速區(qū)間采取風(fēng)儲協(xié)調(diào)控制方法進(jìn)行調(diào)頻,風(fēng)電機(jī)組降載運(yùn)行,留有有功余量,配合電池儲能系統(tǒng)出力對電網(wǎng)進(jìn)行頻率支撐。所提出的風(fēng)儲聯(lián)合系統(tǒng)調(diào)頻控制策略,在提高電網(wǎng)頻率穩(wěn)定性的基礎(chǔ)上兼顧了風(fēng)電場的經(jīng)濟(jì)性運(yùn)行。再次,分析風(fēng)儲聯(lián)合系統(tǒng)參與系統(tǒng)調(diào)頻的理論,根據(jù)所提出的風(fēng)儲聯(lián)合調(diào)頻控制策略,采用不同風(fēng)速下風(fēng)儲聯(lián)合系統(tǒng)采用多種控制方法相結(jié)合的調(diào)頻方法,分析研究風(fēng)電機(jī)組槳距角控制、電池儲能系統(tǒng)荷電狀態(tài)分區(qū)控制以及風(fēng)機(jī)轉(zhuǎn)子轉(zhuǎn)速恢復(fù)控制,將風(fēng)機(jī)與儲能調(diào)頻技術(shù)相結(jié)合運(yùn)用于風(fēng)儲聯(lián)合系統(tǒng)調(diào)頻控制。最后,在DIgSILENT/PowerFactory仿真環(huán)境下,搭建風(fēng)儲聯(lián)合系統(tǒng)調(diào)頻仿真模型,對低風(fēng)速、高風(fēng)速及變風(fēng)速三種工況下,系統(tǒng)頻率變化與運(yùn)行狀況進(jìn)行仿真分析。結(jié)果表明,論文所提出的計(jì)及風(fēng)速波動區(qū)間的風(fēng)儲聯(lián)合調(diào)頻控制策略,可提高電網(wǎng)頻率穩(wěn)定性,加快系統(tǒng)對頻率變化的響應(yīng)速度,同時(shí)避免頻率的二次跌落。在仿真分析的基礎(chǔ)上,運(yùn)用RT-LAB進(jìn)行半實(shí)物仿真實(shí)驗(yàn),驗(yàn)證風(fēng)儲聯(lián)合系統(tǒng)參與系統(tǒng)調(diào)頻的可行性。
[Abstract]:Wind power generation has randomness and volatility. Wind power grid brings fluctuation to the frequency of the power system. With the increasing of wind power permeability in power system, the influence of wind power grid connection on the frequency of power system becomes more and more obvious. At present, the wind turbine generally adopts the optimal power operation mode and cannot participate in the frequency modulation dispatching of the power grid. However, it is bound to lose the generating efficiency of the wind turbine by using the active power allowance left in the download operation. How to maximize the FM capability of wind power under the premise of ensuring the economic operation of wind power has become the key problem in the establishment of grid friendly wind farm. In order to solve this problem, this paper studies the tuning method of FM active power margin, wind speed threshold and energy storage capacity of wind turbine, and makes use of the complementary advantages of wind turbine and energy storage system in power transmission and frequency modulation capability. The frequency stability of power system is improved by using air storage combined with frequency modulation control method. Firstly, according to the mathematical model of three phase static coordinate system and two phase rotating coordinate system, the active and reactive power decoupling control of wind power generation system is completed, and the model of doubly-fed wind turbine is established. The dynamic aggregation model of wind farm is established by equivalent method. According to the structure, mathematical model and working principle of battery energy storage system, this paper establishes the foundation for simulation and analysis. Secondly, a combined FM control strategy with wind speed fluctuation interval is proposed. In the low wind speed area, the wind turbine operates according to the optimal power mode, and the energy storage system provides the frequency modulation reserve. In the high wind speed range, the wind turbine operates at lower load by adopting the coordinated control method of the air storage. Cooperate with the battery energy storage system to carry on the frequency support to the power grid. The proposed FM control strategy of the combined wind-storage system takes into account the economic operation of wind farms on the basis of improving the frequency stability of the power grid. Thirdly, the paper analyzes the theory that the combined air storage system participates in the frequency modulation system. According to the proposed control strategy of the air storage joint frequency modulation system, the combined air storage system under different wind speeds adopts a combination of multiple control methods. This paper analyzes and studies the pitch angle control of wind turbine, the zone control of charging state of battery energy storage system and the speed recovery control of fan rotor. The combination of fan and energy storage frequency modulation technology is applied to the frequency modulation control of combined wind storage system. Finally, in the DIgSILENT/PowerFactory simulation environment, the FM simulation model of the combined air storage system is built to simulate and analyze the system frequency change and operation state under three operating conditions: low wind speed, high wind speed and variable wind speed. The results show that the proposed combined FM control strategy with wind speed fluctuation can improve the frequency stability of the power network, accelerate the response speed of the system to the frequency change, and avoid the secondary frequency drop at the same time. On the basis of simulation and analysis, the feasibility of air storage joint system participating in frequency modulation is verified by using RT-LAB in the hardware-in-the-loop simulation experiment.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM614;TM712
[Abstract]:Wind power generation has randomness and volatility. Wind power grid brings fluctuation to the frequency of the power system. With the increasing of wind power permeability in power system, the influence of wind power grid connection on the frequency of power system becomes more and more obvious. At present, the wind turbine generally adopts the optimal power operation mode and cannot participate in the frequency modulation dispatching of the power grid. However, it is bound to lose the generating efficiency of the wind turbine by using the active power allowance left in the download operation. How to maximize the FM capability of wind power under the premise of ensuring the economic operation of wind power has become the key problem in the establishment of grid friendly wind farm. In order to solve this problem, this paper studies the tuning method of FM active power margin, wind speed threshold and energy storage capacity of wind turbine, and makes use of the complementary advantages of wind turbine and energy storage system in power transmission and frequency modulation capability. The frequency stability of power system is improved by using air storage combined with frequency modulation control method. Firstly, according to the mathematical model of three phase static coordinate system and two phase rotating coordinate system, the active and reactive power decoupling control of wind power generation system is completed, and the model of doubly-fed wind turbine is established. The dynamic aggregation model of wind farm is established by equivalent method. According to the structure, mathematical model and working principle of battery energy storage system, this paper establishes the foundation for simulation and analysis. Secondly, a combined FM control strategy with wind speed fluctuation interval is proposed. In the low wind speed area, the wind turbine operates according to the optimal power mode, and the energy storage system provides the frequency modulation reserve. In the high wind speed range, the wind turbine operates at lower load by adopting the coordinated control method of the air storage. Cooperate with the battery energy storage system to carry on the frequency support to the power grid. The proposed FM control strategy of the combined wind-storage system takes into account the economic operation of wind farms on the basis of improving the frequency stability of the power grid. Thirdly, the paper analyzes the theory that the combined air storage system participates in the frequency modulation system. According to the proposed control strategy of the air storage joint frequency modulation system, the combined air storage system under different wind speeds adopts a combination of multiple control methods. This paper analyzes and studies the pitch angle control of wind turbine, the zone control of charging state of battery energy storage system and the speed recovery control of fan rotor. The combination of fan and energy storage frequency modulation technology is applied to the frequency modulation control of combined wind storage system. Finally, in the DIgSILENT/PowerFactory simulation environment, the FM simulation model of the combined air storage system is built to simulate and analyze the system frequency change and operation state under three operating conditions: low wind speed, high wind speed and variable wind speed. The results show that the proposed combined FM control strategy with wind speed fluctuation can improve the frequency stability of the power network, accelerate the response speed of the system to the frequency change, and avoid the secondary frequency drop at the same time. On the basis of simulation and analysis, the feasibility of air storage joint system participating in frequency modulation is verified by using RT-LAB in the hardware-in-the-loop simulation experiment.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM614;TM712
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