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This paper presents an ac ripple repression method for neutral-point voltage of three-level inverter system with electrolytic capacitor less. To reduce the volume of three-level inverter system, electrolytic capacitor with huge capacitance is must eliminated from dc-link. In the inverter system applying film capacitors, however, the ac ripple component in neutral-point voltage of dc-link is increased...
This paper proposes an improved discontinuous PWM (DPWM) algorithm. The modulation signal of the conventional DPWM changes discontinuously and has many harmonic components. If these harmonics components and the resonant frequency band by a grid-connected LCL-filter are overlapped, the grid current oscillates. To solve this problem, the proposed method uses the 6-th harmonic injection technique to...
This paper proposes an output current ripple reduction algorithm using model-based predictive control (MPC) for an energy storage system (ESS). In single-phase systems, the DC/AC inverter has a second-order harmonic at twice the grid frequency of a DC-link voltage caused by pulsation of the DC-link voltage. The output current of a DC/DC converter has a ripple component because of the ripple of the...
This paper proposes a design scheme for an LCL-filter used for three-parallel operation in 2MW-wind turbines. An appropriate design method of the delta configured LCL-filter is also proposed to improve the output power quality in the system. A novel design method for the inner inductance of the LCL-filter is proposed in order to overcome the existing trial and error methods used in designing a filter...
A novel Z-source sparse matrix converter (ZSMC) is developed based on the structure of a sparse matrix converter (SMC) to reduce the number of unipolar power semiconductor switches. It also employs a Z-source network to overcome the inherent limitation of the low voltage transfer ratio of the conventional matrix converter. The ZSMC still, however, connects a three-phase voltage source to a three-phase...
This paper proposes second-order SDSDM (Space Dithered Sigma-Delta Modulation) to suppress the harmonic spikes in power conversion. PWM (Pulse Width Modulation) normally operates with a fixed switching frequency, which causes power spectrum to be concentrated at multiples of the switching frequency. The proposed scheme is confirmed in the DC/DC converter. The experimental results show that the proposed...
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