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This paper develops the N-paralleled converters with LCL filter system model and expands the virtual resistor control method for harmonic current control. Power electronic converter can be controlled as a current source. For some application the current source can be used to test the inductor characteristic, such as temperature rise, noise or vibration. While in some cases, several converters are...
This thesis introduces a digital method which can generate standard distortion signal. Based on the mathematical definition of distortion, standard distortion signals with fixed distortion are generated by Matlab, and then downloaded to the function signal generator. At last the standard signal distortion is output by the function signal generator. In addition, this paper introduces the realization...
Distribution STATic synchronous COMpensators (DSTATCOMs) have been proved an effective approach to correct power quality in distribution network. With reactive component and harmonic component of load current detected independently, selective compensation mode can be realized. To improve the reactive compensation ability and harmonic suppression performance of a cascaded DSTATCOM, the fast-transient...
In the microgrid, the capacitive element such as compensation capacitor may resonance with the line inductance in harmonic frequency, furthermore serious harmonic resonance may endanger the system. In this paper, resonance mode analysis (RMA) method is used to analysis the harmonic resonance in the microgrid. To suppress the amplified of harmonic current near resonance frequency, an improved current...
In this paper, a control method named hybrid dynamic capacitor is proposed to provide dynamic VAR compensation and suppress resonance between power capacitor and system inductance in power distribution network. This paper explains the theory of hybrid dynamic capacitor and this method benefits by reducing the initial cost, switching loss and less harmonic current. Finally, simulation and experiment...
Distribution STATic synchronous COMpensators (DSTATCOMs) have been proved an effective approach to compensate reactive current in distribution network. With positive-sequence component, negative-sequence and zero-sequence component of unbalanced load current detected independently, selective reactive current compensation with individual phase control strategy can be realized. To improve the steady...
A control method named Active Harmonic Resistance (AHR) using repetitive control technique is proposed to suppress the resonance between the power capacitor and system inductance in power distribution network. Firstly, this paper explains the theory of AHR and its low voltage tracking precision. Secondly, the parameters design and stability analysis of repetitive controller applied in the voltage...
Distribution STATic synchronous COMpensator (DSTATCOM) has been proved an effective approach to compensate reactive and harmonic current in distribution network. However, DC-link voltages of H-bridge cascaded DSTATCOM contain 100Hz (double grid frequency) voltage harmonics due to reactive compensation current, these harmonics will also exist in the output of DC-link voltage balancing controller which...
For high power three-level NPC grid connected inverter, which has the characteristics of low switching frequency and complex harmonic distribution of output current waveform, it deduces the total output filter inductor expression and researches the relational expression between inductance ratio, damping ratio and resonant frequency, harmonic attenuation ratio, as well as damping power. Based on this,...
In order to control the D-FACTS effectively and maintain high efficiency of the novel D-FACTS, high precision of the compensation voltage of each DSC is required. High precision DSC control can be achieved with Proportion-Resonance controller in stationary frame or Proportion-Integration controller in DQ frame. These two controllers are designed and implemented in both MATLAB/SIMULINK and experiment...
A fast-lock-in harmonic-free all-digital delay-locked-loop (ADDLL) in STMicro 32nm CMOS technology is presented. The ADDLL uses a novel complementary delay line with lattice-type delay elements. The complementary line can effectively reduce at most 50% active delay elements than a single line. Less active delay elements make better suppression of supply-induced jitter. The lattice-type delay element...
In power distribution network, resistor is commonly series with the passive filter in order to avoid its resonance with line impedance. A power electronics converter based Active Harmonic Resister (AHR) is proposed in the paper to replace the passive resistor. With the proposed method, potential resonance could be efficiently suppressed, and the active power loss in passive resistor is gone. The proposed...
The main goal of this paper is to perform a comparative study of different space vector pulse width modulation (SVPWM) techniques for dual three-phase permanent-magnet synchronous motor (DTP-PMSM) drives. Simulation results are provided to emphasize the advantages and disadvantages of each method. Experimental tests have been carried out to validate the most promising strategy which gives satisfactory...
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