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This paper proposed a single-phase to three-phase converter with APF in house-service power supply of traction substation. The single phase part of converter is controlled as the rectifier, with implement of the active power filter (APF). The three phase part of converter is used as an inverter. The experiment of the step-down prototype verified the control strategy of the converter.
This paper compares the performance of surface PM generators when operated with a switched-mode rectifier and an inverter. An analytical model including losses for the surface PM generator and power electronics controller is developed and validated against simulations and experimental results. This is used to generate efficiency maps as a function of output power and speed for the generator operating...
In order to suppress harmonics and optimize power grid quality for the indirect matrix converter (IMC), harmonic characteristics of the input current in IMC are analyzed. The classic dual space vector modulation (SVM) method is adopted for IMC. Generally, only the rough results of harmonic analysis can be achieved by using the conventional mathematical model based on the transfer function. In this...
This paper discusses the main circuit topology and control method of current source controller(CSC) for a three-phase induction motor. In the circuit, the three phase AC power supply is taken as the input part of CSC, which is rectified into three phase controlled rectifier. In DC circuit, the DC bus inductor is utilized to store energy and filters harmonic so that the circuit is shown as the current...
Characteristics of PMSGs used for current-source type wind farm composed of series-connected wind generators are studied. A series of experiments was carried out with an experimental set composed of series-connected thyristor rectifiers with PMSGs as wind turbine generators and current-source thyristor inverter. A simulation model based on trapezoidal waveforms of armature electro-motive force for...
Consider the system dx/dt = f(X) f(0)=0 Then the origin is an asymptotically stable equilibrium of the nonlinear system if A, the Jacobian matrix of f, evaluated at the origin, has all its eigenvalues in the open left-half plane.
This paper describes the soft start and grid connection control strategies for high power synchronous compensator fed by low-voltage load-commutated inverters (LCI). In the start-up stage, field weakening method is used to make the motor start stably, and the back electromotive force (EMF) basically remain stable within the LCI withstand voltage at the same time. When the motor speed up to above the...
It is well-known that the active switching of the DC-voltage inside the inverter is the dominant source of high frequency noise. In contrast, the impact of the diode rectifier is often believed to be small due to its low-frequency commutation without active switching. In this work we show that the diode rectifier has in fact a big impact on the noise propagation and therefore also on the EMC-filter...
In order to reduce the ripple of DC-link voltage and capacitor current, this paper presents a method to select suitable capacitance for the rectifier (full-wave controlled) and inverter. Meanwhile, a braking unit is developed to prevent the overvoltage of DC bus. The impact of the length of cable, connected between the braking unit and the inverter, is researched from a mathematical point of view...
This paper introduces a mathematical model for VSC-HVDC transmission link with two non-linear control strategies, namely Sliding Mode Control (SMC) and Integral Sliding Mode Control (ISMC). Sliding mode control is invariably used to address control problems in non-linear systems. The main drawback of sliding mode based approach is chattering. To reduce chattering and to minimize the steady state error...
In view of the current problems of complex structure and small capacity of the four quadrant medium voltage frequency converter, this paper puts forward the topology of the three - level, high power, and the four - quadrant medium voltage inverter based on IGCT. Based on the study of the characteristics of IGCT switch, the topology and control technology of three levels PWM rectifier are studied....
An investigation is carried out to assess the conducted emission (CE) in a wireless power transfer (WPT) system for automotive applications. The assessment is performed by simulations of the whole system which is modeled by a circuit representation of each single subsystem, including the coupled inductive coils, compensation networks, converters and terminations. The obtained circuit model is analyzed...
Because of the inherent defects of the traditional High-Voltage Direct Current (HVDC ) transmission systems, this paper proposes a control method of flexible HVDC transmission system based on shuffled frog leaping algorithm(SFLA), which will improve the anti-interference ability of the power system by optimizing active disturbance rejection controller(ADRC).
In this paper, the structure of indirect matrix converter (IMC) is presented and the space vector pulse width modulation method (SVPWM) is analyzed to apply for this converter. The advantage point of IMC is directly connected a load to a three-phase power source using six bidirectional switches and twelve unidirectional switches without using any intermediate energy storage element. IMC stands out...
This paper introduces a single-stage isolated 48V-to-1.8V point-of-load converter based on the impedance control network (ICN) resonant converter architecture. This point-of-load ICN converter achieves large step-down while maintaining high efficiency across a wide range of input voltage and output power. Large step-down is achieved using a novel immittance network transformer and a resonant current-doubler...
Since the introduction of Electrical Multiple Units (EMUs) to China, traction control technology has become one of the study hotspots. The traction control system of EMUs consists of a traction converter system and a Traction Control Unit (TCU). The traction converter system is composed of a transformer, a four-quadrant pulse rectifier, intermediate DC link, rheostatic chopper, a three phase half...
In this paper, the performance characteristics of two coil and three coil structure for Wireless Power Transfer(WPT) systems are compared. The circuit model of both the systems are derived with the help of circuit theory. To obtain the high energy efficiency, the three coil structure is proposed. The analysis shows that this structure provides high efficiency for wider range of loads. The Simulation...
In this paper, a new approach for achieving speed control of induction motor and three phase inverter output balanced currents under unbalanced grid voltage condition are presented. The proposed method is based on vector control of induction motor by using field oriented control. In unbalanced grid voltage condition, negative sequence components appear on the grid voltage vector, leading to distorted...
This paper proposes a mixed dq-control scheme for a sensorless PMSM drive to improve input power factor with an electrolytic capacitor-less bridge rectifier. Instead of using bulky traditional electrolytic capacitor, a very small film capacitor is adopted to achieve high input power factor with improved power density and reliability. However, due to large dc-link voltage fluctuations, deterioration...
Direct current (DC) power technology, is well-established as a fully controlled power link between different ac grids. Nowadays, distributed generation (DG) has substantially changed the traditional power grid structure, with the high penetration of the renewable energy systems (RES) playing a key role on the system performance. The stochastic and intermittent nature of the power injected by the RES...
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