In this paper, the problem of open-switch faults of a voltage source inverter system is investigated. A new fault diagnosis method based on an observer and an adaptive threshold is proposed. This method only needs to utilize the signals existing in a system without the need for extra hardware circuits. First, an observer is designed on a model of a three-phase voltage source inverter system to estimate

The use of an adaptive notch filter (ANF) is one of the most popular methods to block harmonics in a phase-locked loop (PLL). Existing ANFs suffer from drawbacks such as a low harmonic rejection capability, complex structure or instability. To improve the performance of ANF-based PLLs, an enhanced ANF (EANF) is proposed in this paper. Its structure, filtering characteristics and frequency-adaptive

In motor drive systems based on model predictive control, a mathematic model of the motor is used to predict the future behavior of the system. However, the parameters in the motor model may not match their real values since these parameters may vary under different operation conditions. All parameter variations result in inaccurate predictions, and influence the steady-state control performance of

In this paper, a novel impedance network referred to as a high-gain switched-coupled-inductor quasi-Z-source network (hgSCL-qZSN) is presented. The proposed topology employs a two-winding switched-coupled-inductor and a switched-capacitor in the impedance network, which offers a higher voltage boost capability when compared to most of the existing ZS-based topologies. In addition, the proposed SCL-qZSN

This paper presents a novel predictive direct torque control (PDTC) for permanent magnet synchronous motors (PMSMs) using the zero voltage vector and a selected voltage vector from the 12 available voltage vectors. The 12 voltage vectors consist of 6 effective voltage vectors and 6 combinational voltage vectors to improve control performance. To select the optimum voltage vector for each of the operating

Lithium-ion batteries have recently been in the spotlight as the main energy source for the energy storage devices used in the renewable energy industry. The main issues in the use of lithium-ion batteries are satisfaction with the design life and safe operation. Therefore, battery management has been required in practice. In accordance with this demand, battery state indicators such as the state-of-charge

Nine-switch converter has promising application prospects in fields where cost, volume and power density are required. The performance of the converter depends to a large extent on the modulation strategy. The existing SVPWM strategy for nine-switch converter requires a lengthy zero-vectors table to make over-modulation judgment, which increased the complexity of the algorithm and the runtime of the

The HVAC (Heating, Ventilation & Air Conditioning) system of an electric vehicle consists of an electric compressor including PMSM (Permanent Magnet Synchronous Machine) and a PTC (Positive Temperature Coefficient) heater. Each of these systems is configured independently. This paper proposes an HVAC system that integrates the compressor control system and the heater control system. The system shares

Under unbalanced grid conditions, the controller design of a three-phase pulse width modulation (PWM) rectifier is based on an instantaneous power model. By calculating the current references of the converter according to the instantaneous power model, traditional voltage-oriented control (VOC) methods realize the positive-sequence and negative-sequence active and reactive current control of the converter

In recent years, an increasing amount of attention has been paid to non-isolated photovoltaic power generation systems, where leakage current suppression is one of the key issues to be addressed. In view of this problem, this paper proposes a novel ten-switch three-phase circuit that is referred to as an H10 inverter. This circuit is obtained by adding two isolating switches and a clamping circuit

This paper presents an efficient, cost effective design implementation of a hybrid digital architecture for space vector pulse width modulation (SVPWM) method for multilevel inverters (MLIs). The SVPWM method is one of the most popular real time PWM method for three phase voltage source inverter (VSI). The implementation of SVPWM method becomes complex with an increase in the number of levels in a

Electric vehicles (EVs) with induction motor (IM) drives require energy optimization due to their limited energy storage capacity. Among the energy optimization methods currently available, a loss model-based controller (LMC) is a satisfactory technique, since it converges rapidly to an optimal operating point. Some of the simplifications applied to LMCs, such as neglecting the core loss and leakage

This paper proposes a novel method to reduce the DC-link capacitor in the single-phase onboard battery chargers. A low-voltage charging circuit is used as a two-parallel buck–boost converter to absorb ripple in the DC link. Thus, the required DC-link capacitance of the onboard battery charger can be reduced significantly without adding additional switches, heat sinks, and gated drivers. In addition

The steady rise in the deployment of grid-connected inverters is driving a need for more efficient and accurate grid synchronization techniques. In this paper, digital implementation methods are proposed to increase grid synchronization accuracy when an integrated filter is used. First, a method to compensate for the computational delays in the implementation of integrated filters with numerical integrations

Wireless power transfer (WPT) systems based on magnetic resonance provides a possible method to supply energy for implantable medical devices, such as gastrointestinal robots and wireless capsule endoscopes. However, low power transfer efficiency (PTE) (most researches show it to be lower than 3%) and poor power received stability are the key limitation of WPT systems in such applications. Three-coil

This paper shows the relationship between the circuit parameters and the voltage sharing performance in series-connected insulated gated bipolar transistors (IGBTs). A simple analytic model is proposed to examine voltage balancing in series-connected IGBTs. By the proposed model, the reason for voltage imbalance is easily analyzed. In addition, the impact of the time constant of the snubber, which

This paper proposes a novel cooperative control strategy for voltage restoration and power management in DC microgrids based on the DC bus signaling (DBS) method. In the conventional DBS method, the operation mode is determined according to the voltage deviation. Thus, it is difficult to achieve voltage restoration. To overcome this problem, the conventional DBS method is modified by applying the total

Photovoltaic (PV) systems require outdoor experiments to verify their functionality and reliability. However, outdoor experiments require complicated experimental set-ups including PV panels, power conversion circuits and controllers. In addition, the experimental data obtained from such systems can be easily affected by environmental conditions such as weather, temperature and season. Recently, PV

Low spatter CO2 arc welding is often used for ultra-thin steel sheets with a thickness of under 1.0-mm. In this paper, a high speed forward and reverse motion control algorithm for the motor in a welding torch and a dedicated controller for it are presented. The dedicated controller is designed with a motor driver IC (A3930) and a DSP (TMS320F-28069) coded with the proposed motion control algorithm

During the short-circuit fault of a two-level bridge converter based on silicon carbide (SiC) metal–oxide–semiconductor field-effect transistors (MOSFETs), the SiC MOSFETs may fail within a few microseconds without short-circuit protection. The short-circuit protection of SiC MOSFETs is an essential feature for improving the reliability of converters. This study proposes an improved short-circuit protection

The boosting feature of switched capacitor-based multilevel inverter topologies has been highly recommended for photovoltaic-based applications. However, the main concern with these topologies is the voltage stress across the switches along with the power component count for a higher number of levels. In this paper, a new single-stage boost nine-level boost inverter (9LBI) topology has been proposed

A linear active disturbance rejection control (LADRC) strategy for permanent magnet synchronous motor (PMSM) for road-sensing based on the differential evolution (DE) algorithm is proposed in this paper, called DE-LADRC, to obtain the better dynamic and steady-state responses of the road-sensing simulation in electric vehicle (EV) steering-by-wire (SBW) systems. Since the novel control method ignores

High voltage step-down converters are very popular in distributed power systems, voltage regular modules, automatic vehicles, etc. To avoid extreme duty cycles, a series capacitor-based buck converter with a coupled inductor is proposed in this paper. In this converter, the voltage stresses of the power switches are clamped to half of the input voltage. Thus, low voltage rating MOSFETs with a low Rds

This paper presents a novel structure to inject the electric energy from photovoltaic modules to the grid based on a 27-level asymmetric multilevel inverter. This work proposes mixing existing approaches based on string and central inverters to implement a hybrid structure that generates highly sinusoidal waveforms. Indeed, the presented structure allows for a staircase AC voltage waveform with a low

A high-efficiency active cell-to-cell balancing circuit for Lithium-Ion battery modules is proposed in this paper. By transferring the charge directly from the highest voltage cell to the lowest voltage cell using an LLC resonant converter designed to achieve zero-voltage switching (ZVS) and nearly zero-current switching (ZCS) for all of the primary switches and zero-voltage zero-current switching

Due to an unfortunate oversight, one of the author names has been given erroneously.

The conventional half-bridge submodule (HBSM)-based multilevel modular converter (MMC) cannot block DC faults. To solve this problem, a novel flexible overhead-line high-voltage direct current (HVDC) transmission converter station topology is proposed in this study, which provides DC fault blocking capability. By adding blocking submodules (SMs) onto the positive and negative DC buses of a conventional

Recently, subsynchronous oscillation (SSO) has been captured in direct-drive permanent magnetic synchronous generator (PMSG) based wind farms in many areas without series compensation in nearby power grids. However, there are fewer reports related to this new type of SSO. In addition, an analysis of the new SSO based on existing methods is computationally cumbersome, and the control effect of the converter