【摘要】：風能是一種取之不盡、用之不竭的環(huán)境友好型清潔能源,使得風力發(fā)電受到人們越來越多的關(guān)注。直驅(qū)永磁同步風電機組作為未來發(fā)展的主要機型,該類型的風電大規(guī)模地接入電網(wǎng)導致的大量技術(shù)問題不容忽視。為了減少其對電力系統(tǒng)的帶來的不利影響,實現(xiàn)風電系統(tǒng)與電網(wǎng)和諧發(fā)展、互利共贏,使得對直驅(qū)永磁同步風電系統(tǒng)并網(wǎng)綜合協(xié)調(diào)控制的研究具有十分重要的意義。 論文以直驅(qū)永磁同步風力發(fā)電系統(tǒng)為研究對象,研究了其并網(wǎng)綜合協(xié)調(diào)控制及一些關(guān)鍵技術(shù)。首先,建立了永磁同步發(fā)電機靜動態(tài)數(shù)學模型,提出了一種基于矢量控制的永磁同步電機直接參數(shù)辨識的方法。仿真與實驗結(jié)果表明,該參數(shù)辨識算法是有效的,可以實現(xiàn)定子電阻Rs、d軸電感Ld、q軸電感Lq和永磁體磁鏈ψf離線參數(shù)辨識。其次,建立了風力機系統(tǒng)和變流器數(shù)學模型,設(shè)計了風力機系統(tǒng)及發(fā)電機側(cè)變流器的控制策略以及具有解耦控制器的電壓定向控制的電網(wǎng)側(cè)變流器控制策略。仿真結(jié)果表明,建立的模型和設(shè)計的控制策略是正確的和有效的,且具有較好的動態(tài)特性。然后,針對含直驅(qū)永磁同步風電機組的電力系統(tǒng),提出了直驅(qū)型風電節(jié)點在網(wǎng)絡(luò)方程中的處理方法,并進行了并網(wǎng)動態(tài)仿真的研究。 最后,針對傳統(tǒng)控制方法的不足,提出了一種直驅(qū)型風力發(fā)電系統(tǒng)并網(wǎng)綜合協(xié)調(diào)控制方法。對單機無窮大系統(tǒng)和多機系統(tǒng)算例分別做了仿真研究。仿真結(jié)果表明,上述并網(wǎng)綜合協(xié)調(diào)控制方法能結(jié)合槳距角控制器合理協(xié)調(diào)有功和無功出力,能很好地為并網(wǎng)點電壓提供無功支持以提高系統(tǒng)的電壓穩(wěn)定性,此外也在一定程度上有利于多機系統(tǒng)的功角穩(wěn)定。
[Abstract]:Wind energy is an inexhaustible and environmentally friendly clean energy source, which makes wind power generation more and more concerned. Direct-drive permanent magnet synchronous wind turbine as the future development of the main models, this type of wind power large-scale access to the grid caused by a large number of technical problems can not be ignored. In order to reduce the adverse effects on the power system, realize the harmonious development of wind power system and power grid, and win-win results, it is very important to study the integrated coordinated control of direct-drive permanent magnet synchronous wind power system. Taking the direct drive permanent magnet synchronous wind power generation system as the research object, the integrated coordinated control and some key technologies of the direct drive permanent magnet synchronous wind power generation system are studied in this paper. Firstly, the static and dynamic mathematical model of permanent magnet synchronous generator is established, and a method of direct parameter identification of permanent magnet synchronous motor based on vector control is proposed. The simulation and experimental results show that the parameter identification algorithm is effective and can be used to identify off-line parameters of stator resistance Rs,d axis inductance Ld,q axis inductance Lq and permanent magnet flux chain 蠄 f. Secondly, the mathematical model of wind turbine system and converter is established. The control strategy of wind turbine system and generator side converter and the control strategy of power grid side converter with decoupling controller are designed. The simulation results show that the model and the designed control strategy are correct and effective, and have good dynamic characteristics. Then, aiming at the power system with direct drive permanent magnet synchronous wind turbine, the processing method of direct drive wind power node in the network equation is put forward, and the dynamic simulation of grid connection is carried out. Finally, aiming at the shortcomings of traditional control methods, a grid-connected integrated coordinated control method for direct-drive wind power generation system is proposed. The simulation results of single-machine infinite bus system and multi-machine system are carried out respectively. The simulation results show that the grid-connected integrated coordinated control method can reasonably coordinate the active power and reactive power output with pitch angle controller, and can provide reactive power support for the node voltage in order to improve the voltage stability of the system. In addition, it is also beneficial to the stability of the power angle of the multi-machine system to a certain extent.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614

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