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Novel Approaches to Microgrid Functions
Published in KTM Udayanga Hemapala, MK Perera, Smart Microgrid Systems, 2023
KTM Udayanga Hemapala, MK Perera
A DC to DC converter is a power electronic interface that converts the voltage level of a DC source to another level. There are two main types of DC to DC converters, linear and switched, based on the method of conversion.
Design and Performance Analysis of Controlled DC-DC Converter
Published in Durgesh Nandan, Basant K. Mohanty, Sanjeev Kumar, Rajeev Kumar Arya, VLSI Architecture for Signal, Speech, and Image Processing, 2023
Subhransu Padhee, Madhusmita Mohanty, Ambarish Panda
Design of power electronic system for different applications is a typical engineering problem where the design professional has to consider cost, performance, system complexity, efficiency, reliability, and robustness. As the power system is becoming increasingly complex in nature, power management issues in the system are becoming a real challenge. The complex system comprises of multiple subsystems which have either full or partial interaction with other subsystems. Therefore, power management issue has been one of the emerging research topics in recent times. Beside the control issue, modern day system has several additional features depending on the application. Some of the additional features are (a) communication; (b) re-programming; (c) automatic tuning; (d) fault diagnosis, etc.
Electric Motor Drives
Published in Iqbal Husain, Electric and Hybrid Vehicles, 2021
A motor drive consists of a power electronic converter and the associated controller. The power electronic converter handles the flow of bulk power from the source to the motor input terminals. The function of the controller is to process information and generate the switching signals for the power converter semiconductor switches. The interaction between the components of the motor drive with the source and the electric motor is shown schematically in Figure 10.1. The power converter can be either a DC drive supplying a DC motor or an AC drive supplying an AC motor. The converter functions of the two types of drives are shown in Figure 10.2. A power converter is made of high-power fast-acting semiconductor devices, such as those discussed in Chapter 9. The tremendous advances in the power semiconductor technology over the past two decades enabled the development of compact, efficient and reliable DC and AC electric motor drives. The commonly used power device for the electric motor drive in electric and hybrid vehicles is the IGBT.
Experimental Investigations on Single-Phase Shunt APF to Mitigate Current Harmonics and Switching Frequency Problems Under Distorted Supply Voltage
Published in IETE Journal of Research, 2021
Vijayakumar Gali, Nitin Gupta, R. A. Gupta
Power Electronic-based devices are being used in high power applications like adjustable speed drives (ASD), arc furnaces, flexible AC transmission systems, high-voltage direct current systems, etc. as well as in low power applications like lighting, low-, medium-rating ASD, switched mode power supply, uninterrupted power supply, home appliances, etc. These power electronic devices, in the form of converters, serve as an interface between high, medium and low power consumers [1,2]. The load with these interface arrangements together known as non-linear loads. Continuing proliferation of non-linear loads are responsible mainly for the harmonic pollution, reactive power burden and poor power factor not only in three-phase three-wire (3P3W) but also in three-phase four-wire (3P4W) system [3]. These non-linear loads affect the current and/or voltage profile due to switching action of power switches and inject significant harmonic contents at the point of common coupling (PCC). These harmonics adversely affected other consumers supply voltage/current profile. The detailed reluctant effect of harmonics in electrical distribution system is enumerated in literature [2–6].
Bridge-arm current reduction in DC-AC inverter
Published in International Journal of Electronics, 2018
With the rapid development of the techniques of power electronics, as a result of their remarkable energy-saving features and conversion capabilities, various kinds of power electronic equipment have been widely used in numerous areas. Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), IGBT have been utilised extensively because of their high switching speed, simple drive circuit and good performance. However, the drawback occurs while using them. The power devices generate large voltage changing rate (dv/dt) and current changing rate (di/dt) during the turn-on and turn-off periods, which increases switch current stress and results in poor performance. Furthermore, it may also lead to a malfunction, as well as Electromagnetic Interference (EMI). EMI, which occurs on single bridge arm, upper and lower power devices in single-phase or three-phase converter circuits, will cause the outcome of the converter deviate from the expected performance. As a result, the performance of the converter is highly degraded, even exceeding the limitation of Electro Magnetic Compatibility (EMC) standards. Furthermore, in the worst case, converter could be damaged.
Robustness enhancement of DRL controller for DC–DC buck convertersfusing ESO
Published in Journal of Control and Decision, 2023
Tianxiao Yang, Chengang Cui, Chuanlin Zhang, Jun Yang
However, power electronic systems have specific challenges and characteristics, such as high switching frequencies in control, complex operating conditions and so on. The implementation of RL in power electronics has its own characteristics different from other engineering fields. Although many scholars have tried to apply RL methods in the field of power electronics, there are certain limitations in stability, safety, robustness, etc. (Peng et al., 2019). To ensure the safety and stability of the system, numerous composite control strategies have been proposed. Typically, the parameters of these controllers are tuned by a linearised model of the system under specific operating conditions whilst the integration of more power electronic interfaces and loads makes it more challenging. Thus the existing literature on reinforcement learning (RL) in power electronics systems mainly focuses on combining RL with classical controllers to achieve self-tuning ability. For example, studies have combined adaptive deep deterministic policy gradient (DDPG) compensators with iPI controllers (Gheisarnejad et al., 2020), used PPO-based feedback controllers for coefficient tuning (Hajihosseini et al., 2020), employed data-driven PPO model predictive control (Prag et al., 2021) and developed the composite nonrecursive DRL controller (Huangfu et al., 2022). In contrast, there are limited works using RL as a basic controller, and there are still certain limitations. For instance, a model-free DRL controller based on duty ratio mapping (DRM) was proposed in Cui et al. (2022), however, it requires reacquisition of the DRM when the system varies slightly.