Paper Sharing: Abnormal Voltage Compensation caused by Vertical Crossing in Phase-shifted PWM-based Cascaded H-bridge Inverters

The paper presents a compensation method for abnormal voltage generation in phase-shifted PWM-based cascaded H-bridge inverters caused by vertical crossing. Vertical crossing, which leads to missed PWM pulse updates and subsequent voltage errors and current surges, is predicted by analyzing the modulation wave and carrier slope at every sampling instance. The proposed approach adjusts the modulation wave in the

2025-04-26

Paper Sharing: Grid Voltage Control of Energy Storage System Using Dual Active Bridge Converter

The paper presents a grid voltage control strategy for energy storage systems (ESS) using a Dual Active Bridge (DAB) converter. The primary goal of the study is to enhance the stability of DC grid voltage by maintaining consistent power output despite fluctuations in renewable energy sources, such as photovoltaic systems, and varying load conditions. The proposed control method utilizes a digital deadbeat control

2025-03-21

Paper Sharing: Analysis of Hosting Capacity and Power Quality in a Distribution Line with a Photovoltaic Installation: A Case Study

The paper explores the issues related to overloading low voltage distribution lines and its effects on power quality and system stability. The study primarily investigates the integration of photovoltaic(PV) systems into low voltage feeders, considering both commercial and residential users. It aims to assess the existing and future potential of these distribution lines to accommodate PV installations, particularly focusing on the shift of residential consumers towards becoming prosumers.

2024-08-14

Paper Sharing：Comparison and Analysis of DSIM and SIMULINK Simulation Based on MMC System

Due to its versatile output capabilities, scalability, and high modularity, the Modular Multilevel Converter (MMC) is increasingly applied across various sectors such as high-voltage direct current transmission and renewable energy generation systems. However, the numerous switching devices within the MMC generate electromagnetic interference (EMI), significantly affecting system stability.

2024-08-14

Paper Sharing：Open-Circuit Switch Fault Diagnosis in Single-Phase CHMC with Switching Duty Ratio-Based Estimated Grid Current

This paper introduces a method for diagnosing open-circuit switch (OCS) faults in single-phase cascaded H-bridge multilevel converters (CHMC) using an estimated grid current based on the switching duty ratio. The proposed technique estimates the grid current through the switching duty ratio of each switch during the control period. The faulty switch pair is then identified by analyzing the sign and magnitude of the residual between the estimated and sampled grid currents.

2024-08-14

Paper Sharing：Stability Analysis of a Direct-synchronized Single-phase Grid-tied Inverter

The paper analyzes the stability of a single-phase voltage source inverter (VSI) system by evaluating two direct synchronization methods employed in its phase-locked-loop (PLL): (1) by using the capacitor voltage and second-order generalized integrator (SOGI) quadrature output as PLL input, (2) by directly using both SOGI outputs as PLL inputs. A synchronous reference frame small-signal model is developed by introducing fictitious orthogonal quantities

2024-08-14

Paper Sharing: Virtual Synchronous Generator Control Integrated into a Microgrid

Virtual synchronous generators (VSGs) play a crucial role in this context by facilitating the integration of renewable energy sources and enhancing system stability amidst voltage and frequency fluctuations in the grid. Distributed generation can be categorized into two common scenarios: multiple renewable energy sources connected to independent power sources or to the electrical grid while supplying power to an equivalent total load.

2024-08-14

Paper Sharing: An Integrated Simulation/Laboratory System to Investigate Grid/Inverter Stability Issues

“This paper reports an advanced experimental laboratory test-set that can physically replicate the plant response of large-scale synchronous generators, allowing the dynamic response of power systems with high levels of inverter penetration to be investigated at a laboratory level. The paper also presents a fast execution matching simulation model of the experimental testbed that can be used for control strategy analysis and refinement, before proceeding to experimental investigations.

2023-10-26