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Battery energy storage systems play a vital role in renewable energy based electric power grids. Inverters are essential to integrate DC energy storage devices such as batteries to AC power grids. In this paper, a cascaded boost inverter topology based single-phase grid-connected battery energy storage system is presented. A current feedback ripple reduction method is used to mitigate the second-order...
A saturation map for the non-uniform magnetic saturation of a V-shaped interior permanent magnet rotor is formulated in this paper. This saturation map is used in conjunction with the magnetic equivalent circuit theory to propose an analytical method for accurate computation of the airgap permanent magnet flux density for interior permanent magnet rotors. Unlike the conventional methods, the proposed...
In this paper, a novel control design based on a feedback linearization control (FLC) technique is developed for a Photovoltaic (PV) power optimizer implemented on a non-inverting buck-boost power converter. Unlike the classical local linearization techniques commonly used in the technical literature, this approach allows to obtain large-signal linear equations, by means of the feedback linearization...
Power optimizers are dc-dc converters, featuring maximum power point (MPP) tracking operation, deployed on a per module basis in modern PV plants, adding value on flexibility, diagnostic capability and energy yield. This paper considers the non-inverting buck-boost converter used as a power optimizer, with emphasis on the control scheme applied to it. In the analysed configuration, the converter inductor...
Switched inverters generate fast rates of change of common-mode voltage and are an unwanted side-effect in variable speed drive systems operated with PWM inverters. Whilst techniques have been reported that theoretically eliminate the common-more voltage, when the dead-time effects and the practical transient performance of semiconductors are considered, a common-mode voltage is still generated, even...
Growing penetrations of distributed PV generation in electrical distribution systems has a range of impacts including, notably, voltage rise in the network. This poses new challenges for electricity industry operation and planning. Existing planning tools are not necessarily appropriate in this changing context. This paper presents a novel tool for estimating the maximum PV generation that can be...
A comparison of existing design guidelines for printed circuit board (PCB) planar transformers with 3D finite element analysis simulations is presented. The IPC-2152 standard for determining current carrying capacity of tracks on PCBs was compared with FEA simulated results of the transformer winding temperature rise. Core temperature rise was with manufacturer supplied thermal characteristics for...
This paper proposes three overmodulation schemes in the three-to-five phase indirect matrix converter. The first scheme uses only the adjacent large vectors to produce the reference output voltages. The second scheme improves on that by reducing vector elimination in the d2-q2 vector space based on the requirements of the output. The third scheme reduces the overmodulation requirements of the inverter...
Using one DC source for the dual inverter open-end winding topology can lead to common-mode current circulating through the DC bus connections and, to prevent motor failure, arising of EMI issue and increasing losses in the system this should be avoided. Such common-mode current flow results if there is a common-mode voltage (CMV). Therefore, in this paper, a switching scheme for the dual inverter...
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...
A three-level five phase inverter using coupled inductors is proposed in this paper. By inserting the coupled inductors into a half-bridge circuit, this topology is able to produce three output voltage levels. The usage of the inductors eliminates the need for dead-time zone which improves the total harmonic distortion of the output voltage. In case of the saturation in the magnet core caused by dc...
A novel space vector modulation scheme for a five-to-three phase conventional matrix converter (CMC) is proposed. This modulation scheme is able to increase the voltage transfer ratio to 0.8921 and also ensures vector elimination in the d2–q2 vector space in order to ensure a high quality input current waveform for a reference balanced sinusoidal three-phase output. By utilizing both the large and...
A rigorous mathematical analysis of the conventional direct thrust control scheme for linear permanent magnet synchronous motor is presented. The main inspiration for direct thrust control scheme is the direct torque control algorithm for the rotational permanent magnet synchronous motor which provides a reasonably good torque and flux response. However in case of linear permanent magnet motors, the...
The paper investigates the operation of a novel sparse power converter for the switched reluctance generator for generating ac power. This will eliminate requirement of two stages of power conversion generating into power supply. The performance of the converter is investigated and simulation results are presented.
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