A5056252971- HVDC Systems and Fault Protection
- Silicon Carbide Semiconductor Technologies
- High-Voltage Power Transmission Systems
- Microgrid Control and Optimization
- Power Systems and Renewable Energy
- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Power Systems and Technologies
- Cardiac Structural Anomalies and Repair
- Smart Grid and Power Systems
North China Electric Power University
2025
China Electric Power Research Institute
2023-2025
State Grid Corporation of China (China)
2025
Chinese Academy of Sciences
2019-2021
University of Chinese Academy of Sciences
2019-2021
Institute of Electrical Engineering
2019-2020
Full-bridge submodule (FBSM) capacitance of an FBSM-based modular multilevel converter (FB-MMC) can achieve a significant reduction with boosted ac voltages, which makes it promising candidate in voltage-source-converter-based high-voltage-direct-current scenarios terms cost and dc short-circuit fault tolerance. With consideration third-order harmonic voltage injection (THVI), the characteristics FBSM fundamental frequency second-order fluctuations are analyzed detail under steady-state...
Cascaded H-bridge (CHB) -based solid-state transformer (SST) consists of CHBs and dual active bridge (DAB) converters. Series-resonant DAB converters (SRCs) are widely used for its advantages soft switching characteristic simple control. However, the high-frequency-link (HFL) currents SRCs contain double-line-frequency harmonic fluctuation in three-phase CHB-based SST, resulting high current stress. In this article, SRC is substituted with dc terminal dynamic equivalent circuit, analytical...
DC transformer (DCT) which is composed of dual active bridge (DAB) converters, capable fulfiling high-ratio voltage conversion between the medium-voltage dc distribution and low-voltage distribution. A model predictive control (MPC) strategy was proposed for DAB-DCT to improve dynamic performance achieve a proper power distribution, considering bidirectional DCT. The traditional closed-loop scheme with single-phase shift (SPS) MPC SPS are compared on downscale laboratory prototype, using...
A full-bridge submodule (FBSM)-based modular multilevel converter (FB-MMC) provides additional freedom for modulation index selection, and it has overwhelming advantages in terms of handling dc short circuit faults reducing FBSM capacitance. This paper analyzes the impact reactive power on capacitance reduction FB-MMC with zero-sequence-voltage injection (ZSVI), which indicates that can only be reduced by 17% ZSVI under unity factor conditions. The effect gradually weakens increasing power....
The actively commutation converter (ACC) has been regarded as one of many interesting circuit topologies in high-power systems. In this article, unit power factor operation control method ACC with switching frequency 50Hz is proposed. A 500 kV/400 MW back-to-back HVDC transmission-based built using PSCAD/EMTDC software to verify the correctness method.
The pulse width modulation current source converter (PWM-CSC) has been regarded as one of many interesting circuit topologies in high-power systems. This paper analyzes the influence system parameters on power operating range PWM-CSC, and designs for PWM-CSC applied to HVDC transmission system. A 250 kV/500 MW based is built using PSCAD/EMTDC software, experimental platform was verify correctness analysis feasibility design.
Current-source actively commutated converter (ACC) provides a new solution for high voltage direct current (HVDC) transmission system. However, Power semiconductor devices in ACC need to withstand both forward and reverse voltage. An insulated-gate bipolar transistor (IGBT) diode are usually used series as combined block device. Therefore, the IGBT be configured with sharing circuit separately according traditional method. This requires lot of auxiliary components large-scale series. In this...
The turn-off device based current source converter (TOD-CSC) is a promising circuit topology in high voltage direct (HVDC) transmission systems. Compared with the conventional line-commutated converters (LCCs) controllability of TOD-CSC dramatically enhanced, while cost and complexity are reduced compared voltage-source (VSCs). However, for many applications, such as renewable energy generation systems, black startup big challenge. In this paper, mechanism passive networks analyzed first. A...
With the development of semiconductor, current source actively commutated converter (ACC) provides a new solution for HVDC. Before engineering application, voltage and stresses ACC under different operational conditions should be tested first. Building full-circuit test platform to valves is very resource-intensive, thus an system with low power requirement proposed in this paper. It consists low-voltage high-current source, low-current high-voltage resonant circuit, multiple auxiliary...
The existing HVDC transmission technologies for offshore wind farm is summarized and analyzed first. Based on these analyses, this paper presents a current-source actively commutated converter (ACC) based system farm. This employs fundamental switching frequency ACC with very-low-capacity AC network as the startup auxiliary power supply operation principle of steady-state control strategy also proposed. Comparative analyses VSCHVDC solution show obvious advantages technology in terms passive...
Broadband oscillation poses serious threat to voltage-sourced converter based high-voltage dc (VSC-HVDC) transmission systems. In this paper, a novel impedance optimization control method of grid-connected VSC-HVDC modular multilevel converters (MMC) is proposed suppressing broadband in paper. Different from the previous methods, utilizes one first-order low pass filter voltage feed-forward part reduce resonant frequency MMC and adopts second-order filter, which similar notch current...