本文選題：Hamilton能量函數(shù) + 常值實現(xiàn)　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：現(xiàn)代電力系統(tǒng)是一個典型的高維數(shù)、強(qiáng)非線性復(fù)雜動態(tài)系統(tǒng),其正常運行時不斷遭受各種各樣的擾動。因此,電力系統(tǒng)的安全穩(wěn)定問題一直受到人們的廣泛關(guān)注。電力系統(tǒng)故障時,汽門控制能夠減少因機(jī)械功率與電磁功率不平衡而引起的轉(zhuǎn)速波動和功角擺動,有利于系統(tǒng)重新建立同步。勵磁控制能調(diào)節(jié)發(fā)電機(jī)機(jī)端電壓和無功功率,是電力系統(tǒng)控制領(lǐng)域最常用最經(jīng)濟(jì)的控制手段之一。將汽門控制和勵磁控制相結(jié)合,能提高系統(tǒng)故障后的收斂速度,有利于系統(tǒng)更快地建立穩(wěn)定。早期電力系統(tǒng)的控制器主要是基于非線性系統(tǒng)在運行點附近進(jìn)行線性化下設(shè)計的,但電力系統(tǒng)的強(qiáng)非線性使得采用局部線性化法設(shè)計的控制器不能適應(yīng)電力系統(tǒng)受到大擾動后對暫態(tài)性能的要求。近年來,非線性控制已經(jīng)廣泛用于電力系統(tǒng)中,并取得了豐富的成果。Hamilton能量函數(shù)是非線性理論的重要組成部分。本文針對帶汽門開度控制的發(fā)電機(jī)模型,基于Hamilton能量理論,提出了兩種有效的控制方法。首先,本文首次將常值實現(xiàn)法,即結(jié)構(gòu)矩陣為常值的一種廣義Hamilton實現(xiàn),應(yīng)用于帶汽門開度控制的單機(jī)無窮大系統(tǒng),將系統(tǒng)表示成廣義Hamilton系統(tǒng),并設(shè)計了勵磁和汽門協(xié)調(diào)控制的機(jī)電擾動控制器。針對單機(jī)無窮大系統(tǒng),首次從特征根的角度確定基于Hamilton能量函數(shù)所設(shè)計的機(jī)電擾動控制器的系數(shù)。在控制器設(shè)計中未用到線性化方法,所得擾動控制器充分利用了系統(tǒng)的非線性特性。本文基于常值實現(xiàn)法設(shè)計的勵磁和汽門協(xié)調(diào)控制的機(jī)電擾動控制器與單獨的勵磁控制器以及傳統(tǒng)的PID控制器相比,提高了系統(tǒng)發(fā)生故障時的收斂速度,當(dāng)系統(tǒng)平衡點漂移,該擾動控制器在提高收斂速度的同時能夠減少系統(tǒng)頻率漂移。最后,基于單機(jī)無窮大系統(tǒng)的仿真結(jié)果驗證了本文所提出的機(jī)電擾動控制器的有效性和正確性。其次,首次將Hamilton能量理論和L2干擾抑制的思想應(yīng)用于含有轉(zhuǎn)移導(dǎo)納且考慮汽門開度控制的多機(jī)系統(tǒng)模型,完成了多機(jī)系統(tǒng)的偽廣義Hamilton實現(xiàn),設(shè)計了勵磁和汽門協(xié)調(diào)控制的機(jī)電擾動控制器,具有明確的物理意義�；贖amilton能量函數(shù)法,保留了系統(tǒng)的非線性特性,避開了直接構(gòu)造Lyapunov函數(shù)的困難,具有良好的控制效果。本文采用WECC的3機(jī)9節(jié)點系統(tǒng)的作為算例來驗證本文所設(shè)計機(jī)電擾動控制器的正確性和有效性。仿真結(jié)果表明,勵磁和汽門協(xié)調(diào)控制的機(jī)電擾動控制器與單獨的勵磁控制器相比,提高了系統(tǒng)擾動發(fā)生后的收斂速度,減少系統(tǒng)頻率的漂移,提高了系統(tǒng)的暫態(tài)穩(wěn)定性。
[Abstract]:Modern power system is a typical high-dimensional, strongly nonlinear complex dynamic system, which is subjected to various disturbances in its normal operation. Therefore, the safety and stability of power system has been paid more and more attention. In the fault of power system, the valve control can reduce the fluctuation of rotational speed and the swing of power angle caused by the imbalance between mechanical power and electromagnetic power, which is helpful to re-establish the synchronization of the system. Excitation control can regulate generator terminal voltage and reactive power, which is one of the most common and economical control methods in power system control field. The combination of valve control and excitation control can improve the convergence rate of the system after failure and help the system to establish stability more quickly. The controller of the early power system was designed mainly based on the linearization of the nonlinear system near the operating point. However, because of the strong nonlinearity of power system, the controller designed by local linearization method can not meet the requirements of transient performance of power system after large disturbance. In recent years, nonlinear control has been widely used in power systems, and has achieved rich results. Hamilton energy function is an important part of nonlinear theory. In this paper, based on Hamilton energy theory, two effective control methods are proposed for generator model with valve opening control. First of all, in this paper, the constant realization method, a generalized Hamiltonian realization with structure matrix as constant value, is first applied to a single-machine infinite system with valve-opening control, and the system is expressed as a generalized Hamilton system. An electromechanical disturbance controller for excitation and valve coordinated control is designed. For a single machine infinite bus system, the coefficients of the electromechanical disturbance controller designed based on Hamilton energy function are determined for the first time from the point of view of eigenvalue. The linearization method is not used in the controller design, and the disturbance controller makes full use of the nonlinear characteristics of the system. Compared with the single excitation controller and the traditional pid controller, the electromechanical disturbance controller of excitation and valve coordination control based on the constant realization method is designed in this paper, which improves the convergence rate of the system when the system fails, and when the equilibrium point of the system drifts, The disturbance controller can reduce the frequency drift of the system while improving the convergence rate. Finally, the simulation results based on single machine infinite bus system verify the validity and correctness of the electromechanical disturbance controller proposed in this paper. Secondly, the Hamilton energy theory and the idea of L2 interference suppression are applied to the multi-machine system model with transfer admittance and considering the valve opening control for the first time, and the pseudo-generalized Hamilton realization of the multi-machine system is completed. The electromechanical disturbance controller for excitation and valve coordinated control is designed, which is of definite physical significance. Based on Hamilton energy function method, the nonlinear characteristics of the system are preserved, and the difficulty of constructing Lyapunov function is avoided. In this paper, the correctness and validity of the electromechanical disturbance controller designed in this paper are verified by using the 3-machine 9-bus system of WECC as an example. The simulation results show that compared with the single excitation controller, the electromechanical disturbance controller controlled by excitation and valve harmoniously improves the convergence rate of the system after disturbance occurs, reduces the drift of the system frequency, and improves the transient stability of the system.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM712

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