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In order to increase the output voltage range of photovoltaic panels, battery and fuel cell monomer efficiently in the distributed generation system, In this paper, a novel Z-source high step-up boost converter is presented. With a unique X-type Z-source network, clamping voltage of pump capacitor is improved. The proposed converter achieves a high voltage gain without an extremely switch duty cycle...
A novel high step-up DC-DC converter is proposed in this paper. In this paper, interleaved inductors are utilized to combine with switched capacitors to generate a simple circuit structure. This topology aims to reduce current stress in low-voltage side further, decrease voltage stress in high-voltage side, and to achieve output voltage regulation with a wide range input. The operating principles...
For high power three-level Neutral Point Clamped (NPC) converter widely used in medium voltage speed regulation system, which has the characteristics of low switching frequency and complex harmonic distribution of output current waveform, output filter is needed in order to protect AC-side device. Normally, LC filter is used for its good performance. However, the low switching frequency and complex...
In this paper, a current-feed resonant two-switch forward DC-DC Transformer (DCX) is proposed for high-efficiency and high-density unregulated bus converter applications. With a resonant capacitor in series with the leakage inductance of the transformer, ZCS turn-on and nearly ZCS turn-off can be achieved for the primary switches and there is no body diode and reverse recovery losses in the SR. Meanwhile,...
This paper presents two different capacitors' voltage control schemes for modular multilevel converter (MMCs) with the application for back-to-back systems. Based on the derivation of the relationship between arm currents and active power of the MMCs in back-to-back system, the proposed scheme controls the currents of upper and lower arms independently in MMCs to achieve arm voltage balancing of capacitors...
As the distributed generators are connected together through inverter interface in the microgrid, the control of the control of the interface inverter has an important influence on the operating performance of microgrid. In the paper, the study focuses on the control of the interfaced inverter, when microgrid operates in the islanded mode. In order to make the microgrid property similar to the utility...
This paper proposes a new modeling method for buck converter. The new modeling method, named bi-switching status method (BSM), for buck converter is obtained via the propositional calculus and linear constrain. Based on the mixed logical dynamical (MLD) model, BSM model of buck converter is obtained. Compared with other modeling methods, such as MLD method and state-space averaging method, streamlined...
In recent years, there have been an increasing number of photovoltaic (PV) generators integrated into the modern distribution power network. However, the introduction of a large number of PV units could have a negative impact on the distributed PV grid-connected power generation systems, such as polluting the grid, and causing grid instability, even resulting in the voltage collapse if the relevant...
This paper focuses on the currents supply waveforms of a non-conventional electrical machine - Doubly Salient Permanent Magnet Generator (DSPMG) (10 kW, 50 tr/min), which is dedicated to marine tidal current applications. A dynamical dq model is firstly developed. Then, classical sinusoidal and quasi sinusoidal current waveforms are all applied for DSPMG to minimize the torque ripples and to analyze...
This paper deals with the optimal control of a self-reacting Wave Energy Converter (WEC) where the reaction force is obtained using a damping-plate. Model Predictive Control (MPC) is applied for unconstrained and constrained input control cases. Objective function attempting to optimise the power generation is directly formulated as an absorbed power maximisation problem and thus no optimal reference,...
The work presented in this paper aims to propose a control strategy being able to extract efficiently energy from a fixed-pitch marine current turbine associated with a 5-phase Permanent Magnet Synchronous Generator (PMSG) in healthy mode and in faulty mode. The considered faults are opened phases. For each tidal current speed, the control strategy aims to extract the maximum power with respect of...
Due to the presence of the low-order background voltage harmonics in the grid, it will cause higher current harmonics in the AC side of the grid inverter with Selective Harmonic Elimination PWM (SHEPWM). Therefore the grid inverter with traditional SHEPWM has not prevailed since it is unable to overcome the background harmonics of the utility and satisfy the power quality requirement. In this paper,...
A novel direct torque control based on terminal sliding mode controller for doubly salient electro-magnetic machine was proposed in this paper. The mathematical model of the motor has been constructed and generation principle of torque ripple was analyzed. Based on analysis of torque ripple, phase current waveforms had been optimized to reduce the electro-magnetic torque ripple by using direct torque...
The purpose of this paper is to present the speed-sensorless weighted vector control method of parallel-connected dual induction motors fed by a single inverter. In this paper, the flux linkage of dual induction motors is reoriented, and then the control expressions of weighted rotor flux linkage and weighted torque of dual motors are derived. The weight value of vector control for dual induction...
This paper presents a unified power quality conditioner (UPQC) and its control strategy for assisting the fault ride-through operation of large-scale photovoltaic (PV) power station. The output voltage of PV station can be controlled to its rated value with UPQC under high grid voltage fault condition. Moreover, it can absorb reactive power from the grid under high voltage condition to support the...
Since the loss of input rectifying diode bridge in the conventional PFC converter reduces the efficiency, the bridgeless PFC converter has been proposed. The totem-pole bridgeless PFC converter is the most representative one. However the common mode noise current occurring around the input voltage zero-crossing brings severe EMI problem restricts its practical application. In order to improve noise...
The wireless power transfer (WPT) system for electric vehicles requires high efficiency, lightweight, compact and be suited to big air gap. The WPT system has low coupling coefficient, which is far different from the traditional transformer. Optimal parameters design approach for resonant converter with S-S compensation for WPT is investigated. 85kHz and 20kHz parameters design are introduced in the...
This paper describes a four quadrants converter system for the international fusion tokamak device (ITER) which is now under construction in the south of France. The ITER poloidal field (PF) converter system is thyristor-based and rated for 82 MVA, providing up to ±1.05 kV/± 55 kA dc power to the superconducting magnets to generate a controlled rotating magnetic field for nuclear fusion reactions...
High Pressure Sodium (HPS) is widely used in street lighting applications because of its maturity, reliability, high lighting efficiency, long lifetime and low cost. Light Emitting Diode (LED) is expected as the next generation of lighting source due to its continuously improving luminous efficacy, better color characteristic and super long life-time. The two lighting sources may coexist in street...
As for high power plasma power supply, due to high efficiency and flexibility, multi-channel interleaved multi-stage paralleled Buck DC-DC Converter becomes the first choice. In the paper, two-channel interleaved two- stage paralleled Buck DC-DC Converter powered by three-phase AC power supply is selected as research subject, dedicated for the use of plasma cutting machine of 2×45kW, and the passivity-based...
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