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This paper proposes a coordinated control strategy for VSC-HVDC connected offshore wind farms (OWF) which enhances the ability of the VSC-HVDC system to contribute more synthetic inertia without needs of communications. Different from the previous inertia emulation methods, the proposed method utilizes the OWF to supply additional fast active power change and can provide larger synthetic inertia without...
The number of high voltage direct current transmission (HVDC) installations is growing rapidly nowadays, and network operators are working to define grid codes that regulate behaviors of HVDC system to operate under different conditions. This paper presents implementation of a small-scale HVDC lab prototype, which aims at studying the characteristics of the VSC-HVDC system and meeting the requirements...
This paper presents an investigation of different level-shifted PWM strategies for modular multilevel converters (MMC). The control strategy of level-shifted PWM with sorting method for MMC is introduced, so the good THD performance of level-shifted PWM and simplicity of sorting method can be reached simultaneously. N+1 Modulation and 2N+1 Modulation caused by arrangement of carriers are also explained...
This paper presents design and control of a small-scale high voltage direct current transmission (HVDC) lab prototype, which is intended to study the characteristics of the HVDC system and develop strategies to coordinate the operation of offshore wind systems with the network. At first, the configuration of the whole HVDC system is explained. The structure, the scaling approach, the DC cable model...
The conventional continuous conduction mode boost converter has been widely used for power factor correction (PFC) applications because of its high input power factor and simplicity, but it suffers from conduction loss in the input rectifier bridge and switching loss due to the high switching frequency. The efficiency decreases significantly under the low input voltage or the light-load work condition...
Conventional CCM Boost (CB) PFC has been widely used for the PFC applications because of its high input power factor and simplicity, but it suffers from conduction loss in the input rectifier bridge and switching loss due to the high switching frequency. The efficiency decreases significantly under the low input voltage or the light load work condition. In this paper, a novel Enabling Window Control...
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