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Wind energy is now playing a very important role in the electrical power supply. With growing shares, the focus of the plant control is shifting from maximum power point tracking to also meet grid friendly aspects, like stable output power. This paper analyzed the power flow of wind power generation system equipped with permanent magnet synchronous generator. Wind torque feed-forward control based...
The Partial Resonant Single Active Bridge (PR-SAB) introduced in this paper is able to reduce conduction losses in the Single Active Bridge (SAB) with the addition of partial resonant phases. In the SAB, current flows through the switch snubber capacitors only during the short quasi-ZVS turnoff phases. However in the PR-SAB, current flows in the snubber capacitors instead of the switches and diodes...
A hysteretic self-oscillating bandpass current mode control (BPCM) scheme for Class D audio amplifiers driving capacitive transducers are presented. The scheme provides excellent stability margins and low distortion over a wide range of operating conditions. Small-signal behavior of the amplifier is analysis through transfer function based linear control methodology. Measurements are performed on...
Doubly fed induction generator (DFIG)-based wind turbines are nowadays used widely in large wind farms. Due to the fact the control system of DFIG is not based on the power system frequency, the whole inertia of the power system is reducing rapidly with the penetration of wind generation increasing. This is extremely bad for the stability of the system frequency. Thence, ancillary inertia control...
High density high switching frequency power converter conducted EMC had been analysed, modelling the noise source and noise path, while providing accurate conducted EMC noise limits comparable to accredited noise measurements up to 100 MHz. The military specified DC-DC converters are applicable, spanning from 100 W handheld power managers up to 2 kW DC-DC battery chargers. The Step-Down converter,...
This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multi-phase interleaved half-bridge topology. The charging system is designed to operate for both lithium-polymer and lithium-ion...
This paper proposes a capacitance estimation method for the dc-link capacitor in brushless DC motor (BLDCM) drive systems. The proposed method is performed in the generating mode of the BLDCM. In this mode, the inverse dc current flows to the capacitor and the capacitor voltage is increased by the generating operation. Hence, the capacitance can be obtained from the variation of the capacitor voltage...
A bidirectional cell-to-cell balancing structure using two switches per each cell shows good balancing ability, but many switches lead to increase of the cost and size. To reduce the number of switches, this paper proposes a new cell-to-cell balancing circuit with a center-cell concentration structure. The proposed circuit collects the charges of the overcharged cell into the center-cell, and then...
This paper presents a filter design methodology and control design strategy for LCL+Trap filters deployed in large scale wave power plants. This filter topology appears as an alternative for the widely used LCL filters, since effective harmonic mitigation can be achieved while reducing the overall passive filter components size. As a result, the use of LCL+Trap filters for two-level power converters...
In this paper, the losses of a drive system for electric vehicles (EVs) which consists of the interior permanent magnet synchronous motor (IPMSM) is analyzed. The applied power converter is distinguished into a 2-level inverter and a 3-level inverter, respectively. In addition, two modulations are applied typically in the inverter, known as Pulse width modulation (PWM) at low speed region and 1-pulse...
Meeting ambitious goals of transition to distributed and environmentally-friendly renewable energy generation can be difficult to achieve without energy storage systems due to technical and economical challenges. Moreover, energy storage systems have a high potential of not only smoothing and improving the predictability of the intermittent renewables but also of providing the ancillary services in...
In this paper, a new switching control method for light load efficiency improvement in phase shifted full bridge (PSFB) converter is proposed. The main advantage of the proposed method is that it does not use any additional component in power conversion stage, so that it does not have any additional loss. By using simple “AND-gated” control signals for synchronous rectifier (SR) and optimized dead...
In this paper, four kinds of multicarrier PWM strategies used in three-level converters which are called PD-PWM, POD-PWM, COPWM-A and COPWM-B are evaluated in three aspects: influence of the neutral point (NP) potential fluctuation, fundamental amplitude and THD performance of output waveform. The analysis shows that: 1) Comparing with PD-PWM and POD-PWM, CO-PWMA and CO-PWMB have smaller NP potential...
For the conventional PWM inverter based upon the H-bridge, voltage distortion due to the dead-time effect is hard to attenuate or correct by the LC low pass filter or the feedback compensation. An isolated inverter based on the differential output structure is proposed in this paper to eliminate the dead-time effect. The proposed circuit includes two phase-shift full bridges (PSFB) which share a common...
In this paper, a hybrid dual full-bridge DC-DC converter for radio-frequency (RF) power generator application is proposed to overcome the drawbacks of conventional phase-shift full-bridge (PSFB) converter such as large circulating current of primary side and large output filter size. The proposed converter adopts dual full-bridge hybrid structure with a small series capacitor in the primary side and...
Till now, the various types of the half-bridge (HB) converters with output inductor have been developed, and they exhibit a good performance in medium power applications such as the server power supplies and personal computer (PC) power supplies requiring the hold-up time conditions and high output current. However, they have common problems such as high snubber loss and switch turn-off losses caused...
A practical vector control algorithm for speed control of linear permanent magnet motor without a position sensor is presented. The vector control algorithm is based on decoupled control of d and q-axes currents. The errors in the d and q-axes currents are used as inputs to the two PI controllers to generate the orthogonal d and q-axes components of the reference voltage in rotor flux vector frame...
The paper describes the design of three different structures for printed circuit board embedded inductors. Direct comparison of spirals, solenoids and toroids are made with regard to inductance, dc and ac resistance, electromagnetic field and design flexibility.
Bi-directional inductive power transfer (BDIPT) technique is attractive for applications, such as electric vehicles (EVs), for the realization of vehicle-to-grid (V2G) systems. This paper presents a circuit topology to individually control magnitude and direction of power flow from grid to multiple EVs. The proposed system employs two inductor-capacitor-inductor (LCL) parallel resonant circuits together...
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