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Ultracapacitor-based energy storage systems can be used for the compensation of power deficiency in renewable power generation, and for energy saving in the utilization of electrical power. Two such cases will be considered in this work: the photovoltaic (PV) power plant, and the electric bus. Variable nature of solar irradiation owing to local meteorological and environmental conditions, makes it...
The modular multilevel converter (MMC) is a competitive candidate for VSC-HVDC systems. However, the conventional HB-MMC can't block dc link fault current because of the freewheeling effect of diodes. To solve this problem, researchers proposed an account of sub-modules (SMs) with DC-fault current clearing capability. This paper summarizes the 2 basic criteria and provides a comprehensive review of...
In low-voltage ride-through or unbalance gird voltage condition, the fundamental fluctuation in the neutral-point (NP) voltage of three-level voltage source converter will appear under imbalanced grid voltage situation and has not been researched in detail. A new NP current model under imbalanced grid is developed to investigate the limitations of conventional nearest-vector modulation and to give...
Modular multilevel converter (MMC) receives wide acceptance in high power, high voltage applications. However, large capacity capacitors are needed in the sub-modules due to low frequency fluctuation power. The voltage fluctuation is even larger especially in the startup of Motor drive or low frequency output application. Besides, the integrated energy storage systems (ESS) in MMC is used for recovering...
Power factor displacement and voltage fluctuation might produce due to high reactive power consumption of loads or long distribution lines. These power quality problems need more consideration in islanded microgrids (MGs) due to operating in low voltage grid with the absence of main grid. In this line, a novel control strategy for static synchronous compensator (STATCOM) is proposed in this paper...
This paper proposes a fault tolerant control method of an open-switch fault for a single IGBT in two parallel-connected three-phase AC/DC PWM converter systems. Recently, parallel converter has been widely used in the high power application. However, if the open-switch fault of the IGBT occur in the parallel converter, faulty condition causes the dc-link voltage fluctuation, the distorted grid current...
In order to stabilize the power fluctuation caused by distributed energy in the bipolar-type DC micro-grid, a new hybrid energy storage system (HESS) coordination control strategy is proposed in this paper. First, in order to take advantage of lithium battery and super capacitor complementary performances, a cascade structure of the lithium battery and the super capacitor is adopted. Meanwhile, voltage...
Distributed and controllable energy storages are commonly used to provide specific benefits to help the operation of electric power networks. The major benefits may include peak load reduction, renewable energy intermittent problem mitigation, as an emergency/stand by power supply, and provide auxiliary services to networks etc. Recently, more and more homeowners install various sizes of solar power...
In order to enable dynamic driving while increasing both safety and comfort, active suspension systems can minimize or completely eliminate roll movements in the vehicle body. Active electrical roll stabilization can provide high dynamics to compensate roll movement during cornering while rapidly compensating road irregularities. Whereas battery-stabilized 48 V systems provide sufficient power and...
This paper proposes a two-stage three-level DC/AC converter, which consists a three-level inter-leaved dc/dc boost converter in the first stage, and a three-level neutral-point-clamped (NPC) inverter in the second stage. The boost converter regulates variable and/or wide-range dc source, then provides suitable and stable dc voltage to the NPC inverter. The NPC inverter generates variable frequency...
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