基于27.5kV直掛式級聯型APF的電氣化鐵路電能質量治理技術研究
[Abstract]:In the operation of electrified railway, due to the special power supply mode of the traction power supply system and the complex and changeable operating conditions of the locomotive, the locomotive load produces a lot of reactive power and harmonics, which leads to the low power factor of the traction power supply system, the serious wave distortion and the large voltage fluctuation, which not only increases the loss of electric energy and reduces energy. Using efficiency, it also threatens the safety and stability of traction power supply system and locomotive load in electrified railway, and even causes electrical equipment damage, triggering power supply and driving accidents, causing great loss of state economy. Therefore, effective measures must be taken to compensate and control the electric power quality of electrified railway, and this paper puts forward this paper. Based on the active compensation scheme of 27.5 kV straight cascaded active power filter (APF), the key problems in the implementation of the scheme are studied. This paper first analyzes the electrical characteristics of the EMU on the grid side of the typical alternating and direct AC type electric locomotives of the electrified railway, and through a large number of locomotive load measured data in detail. The reactive power and harmonic characteristics of the locomotive load are analyzed. In addition, according to the data on the field monitoring in the traction substation, the reactive power and harmonic level of the traction bus are analyzed. It shows the urgency of the power quality control of the electrified railway, and provides the basic data for the parameters design of the active compensation system. In the pilot project, this paper summarizes the existing measures for the power quality control of electrified railway, and on the basis of this, a direct hanging cascaded APF is proposed to dynamically control the reactive power and harmonic power quality of electrified railway. For typical traction power supply modes, such as the direct power supply of 27.5 kV power supply with YNd11 and single-phase Vv transformer as the main power supply. The mode, as well as the 2 x 27.5 kV and 55 kV power supply voltage autotransformer (AT) power supply mode, this paper analyzes the cascaded APF realization scheme, the working principle and the system configuration structure, and studies the fundamental active current of different active compensation schemes under different traction power supply modes, the circulation circuit of the fundamental wave reactive current and the harmonic current and so on. The cascade type APF The main circuit is complex and the system is huge, and the corresponding control system is complex and heavy. Therefore, this paper analyzes the ip-iq reference current detection algorithm, the sliding window iterative DFT detection algorithm and the adaptive cancellation detection algorithm with two weights. Based on the analysis of the above detection algorithm, this paper analyzes the space resources and the less time resource consumption. In view of the fluctuation of locomotive load, an improved ip-iq detection algorithm and a single phase harmonic current detection algorithm without phase-locked loop are proposed to improve the detection precision of dynamic load, the response speed and the avoidance of the influence of phase locked loop error on the detection performance. This paper studies the voltage and current integrated control strategy of cascade multilevel converters. In DC voltage control, a mathematical model based on instantaneous energy balance is derived and the parameter tuning method of the global DC voltage control is analyzed. Two comprehensive control strategies are proposed for current tracking control, namely the instantaneous current control strategy based on the deadbeat and quasi resonant control and the direct current control strategy based on D and decoupling. The error free control can deduce accurate mathematical formula based on the system model and have the function of predicting the reference current signal. The quasi resonant control can realize the non error tracking of the AC signal, improve the control precision of the basic wave current, and apply the instantaneous current control combined by the two parties to the direct current control strategy based on the DQ decoupling based on the high power APF. The power supply current is directly used as the control object, which can reduce the number of analog acquisition and save the reference current detection link. It is especially suitable for the application environment of multi feeder line in electrified railway. Based on the principle of vector reconfiguration and pulse exchange, this paper analyzes the principle of two kinds of DC voltage equilibrium control algorithms. The simulation results show the correctness of the above control algorithm. In this paper, the traction power supply mode, the typical steady state of the locomotive load, the transient characteristics and the traction network voltage distortion are considered, and the software simulation model of the active compensation system is established. It is verified that the active compensation system has good reactive power and harmonic compensation ability. On the basis, we build a laboratory small power test prototype, plan the overall function frame of the control system, complete the design of the centralized digital control system, and verify the correctness of the control system through the experiment. It has valuable guidance value for the engineering practice. In the pilot project, the 27.5 kV high power APF engineering machine is debugged and the active complement is verified. The correctness and effectiveness of the main circuit, control circuit and control strategy of the compensation system show that the compensation system has good reactive power compensation and harmonic suppression effect.
【學位授予單位】:北京交通大學
【學位級別】:博士
【學位授予年份】:2017
【分類號】:U223.52
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