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This paper proposes the topology of single-phase Z-source three-level inverter, which combines the advantages of Z-source inverter and multilevel inverter. The modified modulation technique based on alternative phase opposition disposition (APOD) method is suggested to effectively adjust the shoot-through state for boosting and to balance two series capacitor voltages of the three-level inverter....
In this paper, a cell to cell voltage balancing for battery systems is proposed. Batteries of series-connected are widely used in various applications. Differences always exist between different batteries, therefore, a charge equalizer is necessary for the energy system consisting of many batteries either in series or in parallel. A battery management system is usually used to increase the life cycle...
Modular multilevel converter (MMC) has been a research hotspot in the past decade in the high-voltage high-power applications. The basic working principle is analyzed in depth in this paper firstly. A precise control law is deduced to control the output voltage and the circulating current directly and precisely. Different from the conventional control law, arm inductor voltages are considered in the...
The modular multilevel converter (MMC) mainly run at power frequency (50 or 60Hz) especially in the field of HVDC field. The disadvantage of cell capacitor voltage fluctuation at low frequency blocks the kind of convertor applied at AC motor drive. This paper uses a set of control novel scheme to restrain the fluctuation and make MMC to drive induction motor running from standstill to grid frequency.
This paper address compensation performance for the previously proposed smart charger of Electric Vehicles (EVs) with constant dc-capacitor voltage control under multiple household customers. No calculation blocks of the reactive and unbalanced active components on the load side are used in the previously proposed control strategy. The smart charger with the constant dc-capacitor voltage control based...
In this paper, a new grid voltage disturbance rejection scheme with feed-forward control based on the dual closed loop current control strategy is presented. As a means to eliminate the level of low-order current harmonic distortion, the proposed method uses the inner loop capacitor current as the feed-forward variable (CCFF). This strategy can suppress the current harmonics arising from the grid...
A braking algorithm considering voltage limit condition for a PM synchronous motor at high speeds is presented. The phase resistors of stator windings are used as the braking resistors to dissipate the mechanical energy stored in the rotor. The dq current trajectory for maximum braking torque is analyzed under three constraints, the power limit, the current limit, and the voltage limit conditions...
According to different operating modes of microgrid, different control strategies for energy storage system are presented. When microgrid parallels in the grid, the bus voltage of microgrid was supported by grid, and the energy storage system serves as the PQ source, using PQ control strategy; When microgrid is off-grid, the energy storage system serves as the main power supply of microgrid, using...
This paper presents performance evaluation of three-phase induction generator operating as a grid connected single phase induction generator using electronic capacitor for variable speed wind energy applications. When the existing delta connected three-phase can operate as a single-phase induction generator by voltage control techniques using electronic capacitor. The proposed converter system for...
This paper presents an energy-based multi-loops control strategy for the modular multilevel converter, which can provide excellent dynamic performance. A method to remove the ripple components from the DC-link voltage and the arm differential voltage is introduced to achieve the DC components without using the low-pass filters. The energy-balance relationship in the MMC is analyzed and an energy-based...
This paper proposes a novel non-zero sequence choke and analysis of its characteristics when applied as an EMI filter to reduce the common-mode voltage in the PWM inverter. The non-zero sequence choke behaves like an inductor only in the differential-mode circuit, but it has zero impedance in the common-mode circuit. When it is used in series with the capacitors as the EMI filter, the differential-mode...
A novel topology of induction machine with a rotor integrated converter with a floating capacitor is investigated in this paper. The stator windings of the induction machine are directly connected to the grid. While the rotor windings are connected to a converter with a floating capacitor. The steady state mathematical model is presented and used to predict the operating range of the induction machine...
Four-level hybrid-clamped (4L-HC) converter is a newly proposed topology which is suitable for high-performance medium-voltage drives. Zero-sequence voltage (ZSV) is commonly used to balance the DC-link capacitor voltages of this topology and then the common-mode voltage (CMV) is also affected. This paper proposes a CMV reduction method for a back-to-back 4L-HC converter. The relationship of CMV and...
Permanent magnet synchronous generator (PMSG) is attractive as a power source for mobility due to its high power density and low maintenance needed. However, increase of the generator current results in the voltage drop due to the synchronous reactance. That means the generator capability including rated voltage cannot be sufficiently used in whole operating range without reactive power control. This...
Applications using dielectric electro-active polymers (DE-EAP) tend to grow quickly due to their most interesting feature: when activated, displacements can reach ranges as high as 200–300%. How interesting this may be, the voltage to be applied is very high — 5 kV — and therefore difficult to handle and manage. Inductive contactless power transfer (ICPT) systems are elegant solutions to completely...
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