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As the penetration level of wind power increases, displacing conventional power generation with wind power will reduce the inertia of power system and decrease the frequency stability. Energy storage devices with only 5% energy storage of wind farm's rated capacity can produce the same virtual inertia as a same capacity synchronous generator. To reduce the additional costs of individual energy storage...
The concept of HVDC taps drawing small amount of power from HVDC lines to the rural places has been considered for several decades. Most of the earlier tap converters were limited by its loss, cost, reliability, and control difficulties. However, in this paper, the emerging modular multilevel converter (MMC) is adopted as the series HVDC tap, which reveals significantly improved performance and feasibility...
Nowadays more and more pulsed loads and nonlinear loads are carried on the medium-voltage (MVDC) shipboard power system, the pulse and non-linear current in different frequency ranges might induce voltage oscillations on the MVDC bus. In this paper, a novel galvanic isolated bidirectional dc/dc converter based on modular multilevel converter (MMC) with energy storage and dc active power filter function...
Cascaded H-bridge converter (CHBC) is a popular approach for massive battery energy storage system (BESS) connected to the medium-voltage grid. However multi-objective needs, including power control, state of charge (SOC) control, fault tolerant control and so on, makes the control system complicated. A unified control scheme is proposed in this paper. By evaluating the other control objects and power...
For the instabilities and nonlinear problems of photovoltaic (PV) system, this paper proposes a new control strategy basing on the state-space description of PV. The nonlinear PV system is decomposed into two equivalent linear system which makes DC voltage and AC-side power factor decoupled through using the technology of input-output feedback linearization. Pole placement technique is used for making...
For higher power application, the six-switch three-phase boost rectifier is a preferred topology. Compared with three-phase three-wire boost rectifier, the three-phase four-wire input rectifier is more usually used in uninterrupted power supply (UPS) systems to prevent the load neutral from floating. In this paper, the four-wire input boost PFC rectifier is modeled and analyzed; the origin of the...
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