Active third‐harmonic injection indirect matrix converter with dual three‐phase outputs

Abstract

This study presents an active third-harmonic injection indirect matrix converter (3HI2MC) topology with dual threephase outputs. The presented 3HI2MC has the advantages of sinusoidal input and output currents, bi-directional power flow, and can provide two sets of three-phase outputs, whose frequencies and amplitudes can be regulated independently. Compared with the conventional indirect matrix converter (IMC), the input reactive power control range is extended significantly, and the converter can even work as a static compensator. Moreover, a maximal voltage transfer ratio of 0.866 is achievable under all operation conditions. Furthermore, operations of the rectifier and inverters are independent. Thus, for a 3HI2MC system containing multiple voltage-source-type inverters (VSIs), modulation and control task can be implemented flexibly by a separate controller for each VSI, while it is difficult for the conventional IMCs to achieve such a goal. All of the features above make 3HI2MC competitive for the applications that require multiple three-phase outputs such as multiple drives. After describing the topology structure, operating principles and control algorithm in detail, simulation and experimental results are presented to demonstrate the validity and effectiveness of the proposed topology.

Reactive power control of grid-connected photovoltaic micro-inverter based on third-harmonic injection

“…So, the third-harmonic current control iy is important in design the circuit of a third-harmonic injection. The aim is to control the actual third-harmonic current iy which track reference current iy * [23]. Thus Po * and iy * should be found firstly as shown in Figure 8.…”

Comparative Study on Performance Improvement of SPWM/THIPWM based DCMLI Grid Connected DFIG

“…However, this method cannot use the full voltage of supply in the inverter and has high harmonic distortion in the produced waveform of output voltages because the SPWM characteristics of switching are not of a symmetrical nature. THIPWM is a modified technique for generating modulation signals, and it has a lot of features such as: reduction in the losses of commutation, greater modulation index amplitude, higher utilization of the DCbus voltage and reduction in the total harmonic distortion (THD) of the waveform of output voltages, compared with the SPWM technique [12][13][14][15][16][17][18].…”

Unbalanced and Reactive Load Compensation Using MMCC-Based SATCOMs With Third-Harmonic Injection

“…Injection of third-order harmonics in PWM controlled converters is a known technique, mostly applied to the modulation reference signals for making full use of the dc-link voltage [30,31]. A very recent paper described work using third order injection for a grid-connected MMC-HVDC [32] and addressed the same issue as in [30,31]; it proposed a novel curve-fitting method for evaluating the optimal magnitude and phase of the third harmonic, the objective being to minimize the modulation waveform peak values, and hence increase the capacitor voltage utilization. The work described in this current paper deals with the distinct problem of compensating the unbalanced load current.…”