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Familiar special microprocessor with PWM pulse generator cannot provide enough PWM pulses for multi-modular converters or multilevel converters. Field programmable gate array (FPGA) is applied to implement the multichannel PWM pulse generator with no synchronization and communication trouble due to the single chip structure of FPGA compared with the multi-microprocessor scheme. A three-phase voltage...
This paper presents a design of space-vector PWM (SVPWM) integrated circuit. The proposed strategy is implemented and verified on a single Altera's Cyclonetrade series of FPGA (EPICF400C7). Experimental results show that this controller can present an excellent drive performance and its switching frequency, as well as its dead time, is adjustable. The design can be used in vector control of AC servo...
Multilevel converters made of cascaded cells (MCCC) offer a high number of voltage levels with a given switch count. Many variants of the MCCC topology have been introduced over years. Mostly, only integer DC voltage ratios between the cascaded converter cells have been applied to its PWM modulation. This is mainly due to the non-uniform distribution of voltage vectors with the non-integer DC ratios...
Multiphase motor drives are multi-dimensional systems, so multiphase vector control and SVPWM must be implemented in a multi-dimensional vector space. In this paper, multi-dimensional multiphase vector control is developed based on a novel multiphase SVPWM strategy, which could synthesize the required voltage vectors not only in d-q subspace but also in other subspaces. Therefore, all voltage and...
Inverter system, as the interface device between the renewable energy system and grid, plays an important role in the distributed generation system. A double-mode single-phase inverter system, which can be operated in grid-connected mode or stand-alone mode with seamless transitions control, is proposed in this paper. The different control strategies applied on the system for the different modes are...
This paper proposes a parallel active filter with a single phase STATCOM structure to compensate unbalance currents and reactive power of the power line due to unbalanced non-liner three phase loads. Therefore the number of required switches of conventional parallel active filters is reduced from six to four. A new control routine is applied to eliminate requirements for fast data samplers. In addition...
A grid connected power generation systems based on the superior controllers of an active and reactive power are useless during a grid failures like grid short-circuit or line braking. Therefore the change of operation mode from grid connection to stand alone allows for uninterruptible supply of a selected part of grid connected load. However, in the stand alone operation mode the superior controllers...
Automatic on-load voltage regulation of transformer is an effective method to stabilize load voltage. Mechanic contact tap changing switch is not adequate for distributing transformer because of its high cost and low capability. The paper presents the structure and automatic on-load voltage regulating principle of distributing transformer, which employs solid state relay as non contact automatic on-load...
This paper offers a new design-oriented approach to address implementation issues associated with a power and energy management policy for an electric vehicle (EV) powered by a dual-sourced system. A special sequential decision process, which determines the power split ratio and reference energy levels of the dual battery-ultracapacitor sources, has been formulated as a state transition mechanism...
The study of maximum loadability of power systems reveals critical information of steady-state system behavior and allows engineers to develop control strategies against voltage collapse. To achieve this goal, we develop a networked power electronic devices control and measurement system which can be accessed by researchers and students over Internet. This work is the initial step of a Multi-University...
Fuel cells for low or medium power deliver comparatively low voltages compared to the mains voltage at high currents. A high dc-link voltage is needed to feed in electrical energy from fuel cells to the mains via a voltage source inverter. Several well known DC/DC converters can be used to transform the varying fuel cell voltage to the requested amplitude of the dc-link-voltage. Besides transformerless...
This paper offers an alternative to efficiency measurements as an evaluation tool of power supplies. The proposed method works well with little dependency on the output voltage and temperature
This paper presents two new circuit topologies of DC busline side active edge resonant snubber assisted soft-switching PWM high frequency AC link full-bridge DC-DC converter acceptable for 200V-rms and 400V-rms utility AC mains. All the power switches in the full-bridge arms and DC busline can turns on with ZCS turn-on and turn-off with ZVS and the switching power losses of all the switches can be...
In this paper, a DC transformer with line frequency ripple cancellation is proposed. The line frequency ripple cancellation scheme is discussed and applied to the asymmetrical half bridge converter. An asymmetrical half bridge DC transformer prototype is built to verify the proposed approach
A novel alternating-master-salve control strategy for paralleling inverter is proposed, which merely make use of CAN bus to achieve the high precision of synchronization and fast current-sharing control. Only single interconnection bus is requires and simple arithmetic is used by the proposed scheme. Moreover, the paralleled inverters act as master in turn during each cycle of the output voltage and...
A novel dual secondary winding and dual power bridge high frequency link (HLF) inverter is discussed in this paper. Single-stage power conversion, standard half-bridge connection of devices, soft-switching for all the power devices (ZVS or ZCS), low conduction loss, simple bipolar combined phase-shifted control, and high efficiency are among the salient features of the HLF inverter. The principles...
In this article, the authors propose an approach to the problem of the power management in transport applications. The mobile experimental platform ECCE is a series hybrid vehicle which currently has three sources of energy: two thermal machines each coupled with an alternator and a lead-acid battery pack of nominal voltage 540 V. The alternators are inter-connected with the DC-link by means of the...
This paper describes a direct phase control scheme for unity power factor three-phase buck type rectifier modulated with space vector PWM method (SVPWM). The advantages of the developed system are low harmonic distortion in AC supply currents, nearly unity power factor over wide operating scope, easily realization. The theory analysis and modeling method are introduced first. Second, the control scheme...
A 2 kW single phase PFC active IPEM (integrated power electronic module), consisting of full bridge rectifier diodes, current sensing resistor and boost converter, has been developed employing CoolMOS and SiC diodes in this paper. The electromagnetic interference mechanism in the module is demonstrated. In order to reduce the voltage spike of power devices, three different design patterns are compared...
In this paper, a novel topology of APFC with on-line half-bridge UPS controlled by DSP is presented. The operation principle is analyzed. In order to improve the dynamic response feature of APFC and make the design of LC filter easy, improved current hysteretic control is proposed. A digital control scheme based on DSP is presented. The control model of APFC is simulated with Matlab. In order to verify...
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