發(fā)布時間：2018-11-02 16:29

【摘要】：隨著新能源發(fā)電技術的逐漸發(fā)展成熟,風力發(fā)電系統在現代電力系統中占據了相當的比例。然而,風能屬于典型的間歇性能源,風的產生存在一定的隨機性。所以,風力發(fā)電系統的可控性一般弱于傳統的發(fā)電系統,這就嚴重影響了電力系統的安全運行。風力發(fā)電系統的大規(guī)模應用面臨著嚴峻考驗。儲能技術的發(fā)展為解決風機的這些問題提供了可能性。在風力發(fā)電系統中增加儲能設備,可以根據現實情況的需要,控制儲能系統與風機進行有效的能量交換,這將有助于風電系統的可控性和安全性。在電力系統中添加儲能設備,也是未來智能電網建設的一項基本要求。飛輪儲能技術憑借其諸多優(yōu)勢,在增強風電場發(fā)電系統運行可靠性和效率方面可以發(fā)揮至關重要的作用。本文提出了一種應用于永磁直驅式同步風力發(fā)電機的風場級飛輪儲能系統的協調控制策略。首先,對于飛輪儲能單元的控制,本文設計了相應的充放電控制策略,并在轉速-電流雙閉環(huán)控制的基礎上,提出了一種改進的神經元自適應PID控制器,將其用于控制飛輪電機的運行,進而實現飛輪儲能單元的充放電。然后根據經典的李亞普諾夫穩(wěn)定性理論,提出了對該算法的穩(wěn)定性的證明方法,并通過數字仿真驗證了算法的有效性和可行性。其次,與一般的飛輪儲能研究不同,在本文的研究中,除了為風電場中的每臺風機配備一臺飛輪儲能單元之外,還設計了一個飛輪儲能矩陣系統(flywheel energy storage matrix system,FESMS),并聯在風電場的并網出口端。對于飛輪儲能矩陣,本文提出了它的電網拓撲結構設計方案,并按照主從控制的模式,設計了儲能矩陣與風電場之間的充放電控制策略和安全控制策略。在飛輪儲能系統的配合下,風速波動較大的時段,風電場依然可以向電網輸送相對平緩的有功功率。最后,通過分析永磁直驅式風電系統遭遇低電壓故障時面臨的問題,設計了電網故障狀態(tài)飛輪儲能系統的充放電策略,在不影響風能利用效率、避免能量浪費的基礎上,提高了永磁直驅式風機的低電壓穿越能力。本文的研究成果為飛輪儲能技術的發(fā)展提供了參考,為風電場與飛輪儲能系統的應用指出了方向和思路。
[Abstract]:With the development of new energy generation technology, wind power system occupies a considerable proportion in modern power system. However, wind energy is a typical intermittent energy, and wind generation has a certain randomness. Therefore, the controllability of wind power generation system is generally weaker than that of traditional generation system, which seriously affects the safe operation of power system. The large-scale application of wind power system is facing a severe test. The development of energy storage technology provides the possibility to solve these problems of fan. Adding energy storage equipment to wind power generation system can control the energy exchange between energy storage system and fan according to the actual situation, which will be helpful to the controllability and safety of wind power system. Adding energy storage equipment to power system is also a basic requirement of smart grid construction in the future. Flywheel energy storage technology, with its many advantages, can play an important role in enhancing the reliability and efficiency of wind power generation system. This paper presents a coordinated control strategy for wind field flywheel energy storage system applied to permanent magnet direct-drive synchronous wind turbine. Firstly, for the control of flywheel energy storage unit, the corresponding charge and discharge control strategy is designed, and an improved neuron adaptive PID controller is proposed on the basis of rotational speed and current double closed loop control. It is used to control the operation of flywheel motor and realize charging and discharging of flywheel energy storage unit. Then, according to the classical Lyapunov stability theory, a method to prove the stability of the algorithm is proposed, and the validity and feasibility of the algorithm are verified by digital simulation. Secondly, different from the general research of flywheel energy storage, in this paper, in addition to one flywheel energy storage unit for each typhoon in a wind farm, a flywheel energy storage matrix system (flywheel energy storage matrix system,FESMS) is also designed. Parallel in the wind farm grid outlet. For the flywheel energy storage matrix, the design scheme of its topology structure is presented, and the charging and discharging control strategy and the safety control strategy between the energy storage matrix and the wind farm are designed according to the master-slave control mode. With the cooperation of flywheel energy storage system, when wind speed fluctuates greatly, wind farm can still transmit relatively gentle active power to power grid. Finally, the charging and discharging strategy of flywheel energy storage system in fault state of power grid is designed by analyzing the problems faced by permanent magnet direct drive wind power system when it encounters low voltage fault, on the basis of not affecting the efficiency of wind energy utilization and avoiding energy waste. The low voltage traversing ability of permanent magnet direct drive fan is improved. The research results in this paper provide a reference for the development of flywheel energy storage technology, and point out the direction and train of thought for the application of wind farm and flywheel energy storage system.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614

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本文編號：2306338