IEEE Transactions on Power Electronics

Due to the inherent intermittency of solar energy, photovoltaic (PV) microinverters (MIs) often operate under prolonged light-load conditions. To improve energy utilization, this paper proposes a novel online iterative trajectory optimization (OITO) strategy for the single-stage series resonant dual-active-bridge (DAB) MI to enhance the light-load efficiency. Through the zero-voltage switching (Z…

The building sector consumes approximately 32% of global energy and generates 34% of carbon dioxide emissions. Consequently, advancing energy conservation and emission reduction within this sector plays a critical role in mitigating the global climate crisis. Integrating photovoltaic (PV) generation, combined electrical and thermal energy storage systems, direct current (DC) distribution, and fle…

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Permanent magnet (PM) flux linkage and stator resistance are critical thermal indicators for online monitoring PM and winding temperatures of the dual three phase surface-mounted permanent magnet synchronous machines (DTP-SPMSMs). However, both estimations are compromised by position error under sensorless control. This paper proposes a simple online estimation method of PM flux and resistance fo…

Medium frequency transformers (MFTs) have emerged as a key enabling technology in medium voltage (MV) power electronics systems, supporting applications such as solid state transformers (SST), power electronic traction transformers (PETT), medium voltage direct current (MVDC) power distribution. This review provides a comprehensive overview of high-power MFTs, focusing on their state of the art, …

This paper presents a fault-tolerant independent pole control scheme for a zigzag modular multilevel converter (MMC) targeting bipolar medium-voltage direct-current (MVDC) distribution systems. An MMC which adopts a zigzag transformer as an AC grid interface transformer, namely zigzag MMC, has inherent bipole operation capability with unbalanced loads of positive and negative poles on the DC side…

This paper proposes a unified PWM strategy for sup-pressing both intra-phase and zero-sequence circulating currents in two-parallel converters. The presented analytical modeling re-veals that certain vector combinations inherently enable simulta-neous control of both intra-phase and zero-sequence circulating currents. Then, ten candidate vector sequences are constructed us-ing those vector combin…

This paper presents a multiport DC converter with a wireless power port based on an LCL resonant network, applicable to PV-battery systems. The technical barriers to integrated photovoltaic systems focus mainly on PV maximum power point tracking (MPPT) and load power regulation. The proposed topology aims to reduce the cost and improve the sustainability of the PV-battery system by proposing a pa…

LLC resonant converter is widely used in big data centers and telecom rectifiers because of its ZVS, ZCS, and high efficiency. These applications require a high voltage step down LLC converter to convert high-voltage input such as 380Vdc to low-voltage output such as 12Vdc. However, with the traditional resonant transformer structure of LLC converter, because of the high voltage step down, even i…

Toroidal air-core reactors (TARs) exhibit significant advantages due to low leakage flux, making them suitable for compact applications, such as offshore wind power platsforms. Establishing a wideband equivalent circuit for TARs enables rapid calculation of transient voltage distribution, thereby assessing whether the existing structure meets insulation requirements. This paper proposes a modelin…

A comprehensive review on the development of thermal network models for power semiconductor modules is conducted in this paper. Driven by the wide-spread applications of the power electronics in numerous applications, the development of power modules is revolutionised with higher requirements in power density, switching frequency, operational temperature and reliability, which in turn induces con…

This paper proposes an optimal voltage- vector-sequence-based model predictive control (MPC) method for permanent magnet synchronous motor (PMSM) drives that exploits the properties of optimized pulse patterns (OPPs). Specifically, by analyzing OPPs from a space vector perspective, the optimal voltage vector sequence and the corresponding duration are determined in an efficient way, bringing abou…

This article proposes a three-phase quasi-single-stage isolated AC-DC converter, comprising a hybrid active third-harmonic injection buck-type rectifier (H3R) and a dual active bridge (DAB). Based on the input current analysis, globally optimal working modes of the DAB converter are derived through optimal triple-phase-shift (TPS) modulation, minimizing conduction losses while achieving wide-rang…

Partial power processing is an attractive solution that processes only a portion of the total power, which has the advantage of increasing efficiency. It can maintain high efficiency over a wide input range when combined with two stages. Since the conventional two-stage partial power processing structure adopts a full-bridge topology or multiple transformers to achieve smooth integration with a D…

The flipped voltage follower (FVF) based low dropout regulator (LDO) has been developed rapidly due to its fast transient response, high power supply rejection (PSR) and reduced complexity. The conventional FVF loop encounters stability challenges under heavy load conditions when employing dominant pole compensation with a large output capacitance. This paper proposes a solution to extend the loa…

In this paper, one speed sensorless control method with a compound controller and an adaptive speed observer of the toroidal permanent magnet linear synchronous motor (TPMLSM) for electromagnetic launch is proposed. Considering the aperiodic transient trait of launch motor, one compound controller based on feedforward strategy is designed to obtain fast dynamic response under different accelerati…

Achieving robust and precise speed regulation in permanent magnet synchronous motor (PMSM) drive systems remains a significant challenge, particularly under disturbances comprising both periodic and aperiodic components. For aperiodic disturbances, disturbance observers are commonly employed; however, conventional designs often exhibit slow convergence and phase lag, limiting their effectiveness.…

Grid-forming converters (GFMCs) receive increasing adoption in modern power systems due to their salient advantages, such as grid formulation and improved stability in weak grids. In GFMCs, inertia and damping play an essential role on the frequency regulation of modern grids. As such, the accurate estimation of these parameters is of great value for ensuring system stability, advancing ancillary…