Proposed Hysteresis Current Control Research Articles

Understanding the system behaviour of solar photovoltaic-thermoelectric generator based hybrid system on implementation of proposed hysteresis current controller

ABSTRACT Thermoelectric Generators (TEG) have come to the picture in recent days among the widely accepted techniques of thermal management that improvises the modular efficiency and hence generates significant amount of power by reutilising the solar insolation which has been lost during photoelectric conversion. Hence, for ensuring the reliability of the grid; hysteresis current controlled techniques have been implemented for the voltage source inverters (VSI). This paper depicts a relative comparison among the tradition hysteresis current controller (THCC) and Amended hysteresis current controller (AHCC). The AHCC is found to be useful in avoidance of short circuit of DC link voltage, reduction in current overshooting and undershooting and lesser switching per cycle. Finally, the comparative study has been done for three systems namely constant DC integrated; solar PV integrated and reposed replaceable thermoelectric coupled solar PV system. This proposed system yields higher active power delivery and lesser reactive power absorbance by the system. The entire system is analyzed, studied and verified under MATLAB/SIMULINK environment.

Solar fed BLDC motor drive for mixer grinder using a boost converter

<p>The existing mixer grinder comprises of the universal motor operating in alternating current supply due to high starting torque characteristics and simple controlling of the speed. The absence of brushes and the reduction of noise in the Brushless DC (BLDC) extends its lifetime and makes it ideal in a mixer grinder. A novel solar-powered BLDC motor drive for mixer grinder is presented in this paper. A DC-DC boost converter has been utilised to operate a PV (photovoltaic) array at its highest power. The proposed hysteresis current control BLDC system has been developed in the MATLAB. A performance comparison is made using the commercially available mixer grinder along with the simulated proposed system.</p>

고효율 스위칭을 위한 개선된 히스테리시스 전류제어기

Hysteresis current regulator has been used widely because of its simple principle and structure. However, when the current band width is too narrow or the applied voltage is relatively too high, the switching frequency may increase abruptly and it generates a large amount of heat. Thus, this study will suggest a better and simple method to reduce the switching frequency. For single phase current control, the proposed hysteresis current control is executed by adding 0 mode state and comparing the slope of the current reference. This simple method decreases the generated switching frequency and significantly reduces the generated heat. This proposed method was proved with simulations and experiments comparing with the classical hysteresis current control method.

Dynamic Hysteresis Current Control to Minimize Switching for Three-Phase Four-Leg VSI Topology to Compensate Nonlinear Load

This letter presents a dynamic hysteresis current control algorithm for a three-phase four-leg voltage-source inverter (VSI) topology. In order to improve the performance and life of the power switches of VSI, we require an optimized control technique that reduces its switching frequency. Proposed hysteresis current control method is a generalized control method that minimizes switching operations to compensate nonlinear load under both balanced and unbalanced supply voltages. It is shown that this control scheme is able to reduce the switching frequency by more than 50% compared to conventional hysteresis current control method and retain the quality of load compensation. The effectiveness of the proposed control scheme is illustrated through simulations using Power Systems Computer-Aided Design (PSCAD) 4.2.1.

New hysteresis current controller for single-phase full-bridge inverters

A new hysteresis current controller for single-phase full-bridge inverters is proposed here. The proposed hysteresis current controller combines the advantages of both symmetrical unipolar PWM and hysteresis techniques. As the proposed hysteresis current controller has a capability to ensure equal switching frequencies among the switching devices, the capability of inverter switching devices can be fully utilised to improve the output current waveform. The proposed hysteresis current controller is compared with conventional single-band and double-band hysteresis current controllers. Simulated and experimental results are included to show the effectiveness of the proposed current controller.

SMES for Protection of Distributed Critical Loads

This paper proposes the use of a micro high-temperature superconducting magnetic energy storage system (HTS-SMES) to support critical industrial loads connected to the customer's 11 kV load bus with a ride-through capability of around 20 cycles. With the advances of power electronics and digital signal processing technology, such a system can also be utilized to improve the power quality of the power system. A novel control methodology is proposed to regulate the SMES discharge to extend the support time to critical loads during a short-term disturbance in the distribution network. Using a P-Q diagram, the analysis of the power flow from the energy storage system to the power system is presented. The proposed hysteresis controller with SMES increases the operating area in P-Q plane as compared to the conventional d-q controlled scheme used in the literature. This allows the system capability to be utilized to its maximum thermal limits. The scheme also has the capability to control the real and reactive power flow through the converter using the proposed hysteresis current control scheme. This provides the capability to optimize the available energy storage by using load priority scheduling. The detailed three-phase system simulation is carried out using realistic models of the power electronics components used in the converters. Laboratory test results on the prototype are presented to validate the proposed control scheme.