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This paper proposes a current trajectory control strategy considering cross coupling and magnetic saturation effect under voltage and current constraint. It introduces geometric positions of torque and voltage increment in dq axis framework to determine the differentials between target values and results of the previous iteration, and then converts the torque and current differentials into current...
Magnetic levitation refers to the object using electromagnetic force to overcome gravity and achieve a stable suspension or random equilibrium state without mechanical contact.
This paper presents design and implementation of a 20 kVA division-summation (D-Σ) digital controlled three-phase four-wire multi-function inverter system. The inverter can be operated in grid-connected or stand-alone mode to act as a renewable-energy ac power-supply system. In the stand-alone mode, since the D-Σ digital control law includes load impedance estimation, the inverter can track sinusoidal...
The increasing connection of photovoltaic generators (PVs) and new forms of loads into the low voltage (LV) distribution networks may lead to unpredictable voltage problems. This paper investigates a number of existing voltage control techniques for the LV networks in the UK and assesses their ability to maintain the voltage regulation. The voltage control equipment investigated includes the On Load...
Improved reliability and safety of the Medium Voltage DC (MVDC) power distribution systems on board of a ship are the objectives of this work. The authors propose the integration of the self-healing capability of the protection against power system faults, and the protection against measurement faults. Most of previous work in literature focuses on only one of these aspects at a time. Here, the authors...
Integrated microbatteries are being currently developed to act as a ldquomicropowerrdquo source in microsatellites. They help provide localized current capacities or embedded power supplies at the chip level, for space exploration. These power cells are designed to be rechargeable. This research paper aims at presenting charging these power cells using pulsing algorithms developed at MRCI with an...
This paper assesses the transient operation of a 33 kV distribution network in islanded operation consisting of different type and size of loads and distributed (mainly renewable) generators. The generators considered include synchronous generator representing the combined heat and power unit, fixed speed induction generator, doubly fed induction generator and power electronic connected photovoltaic...
Conventional methods of load shedding are too slow, do not effectively calculate the correct amount of load to shed and lack in operating in a coordinated way. This results in either unnecessary or insufficient load reduction. A new technique should be applied that will be fast and optimal relying on slow communication in order for the distribution network to maintain stability and to improve the...
An effective scheme of induction motor control without using stator sensor is proposed in this paper. The effective scheme consist of speed calculation algorithm and voltage/frequency control. The speed calculation algorithm is achieved by sensoring the current of stator and compared with the prospective speed then calculation by DSP. The principles of constant voltage/frequency (V/Hz) control for...
Distributed energy resources (DE) with power electronics (PE) interfaces with the right control are capable of providing reactive power related ancillary services; voltage regulation in particular has drawn much attention. In this paper the problem of how to coordinate control multiple DEs to regulate the local voltage in the distribution system is addressed. A control method for voltage regulation...
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