Feedback Control Strategy to Eliminate the Input Current Harmonics of Matrix Converter Under Unbalanced Input Voltages

Lei, Jiaxing; Zhang, Bo; Bian, Jinliang; Wei, Jiadan; Zhu, Yixin; Jiang, Yu; Yang, Yang

doi:10.1109/tpel.2016.2539398

Cited by 38 publications

(17 citation statements)

References 24 publications

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“…Nevertheless, it will cause high power losses in the converter. Although various active damping strategies to eliminate distorted input current of RL-drive IMC are proposed in the literature [28]- [29], which could possibly be modified for the suppression of distorted output current of IBMC, they require a complex modification in control algorithm and higher switching frequency, which causes higher switching losses. Hence, similarly to [17], [18], a damping resistor is added to the circuit, as shown in Fig.…”

Section: ) Vsr Sidementioning

confidence: 99%

Model Predictive Control for Indirect Boost Matrix Converter Based on Virtual Synchronous Generator

et al. 2020

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Indirect boost matrix converter is potentially a great alternative to a back-to-back converter for permanent magnet synchronous generators based distributed generation since it can achieve a voltage-boost functionality without utilizing a bulky DC-link capacitor. Despite the success of the indirect boost matrix converter topology, there still exist some issues in the relevant control structure that must be resolved appropriately. First, the existing controls are grid-following controls, which is incapable of islanded operation. Secondly, the exiting controls generate a highly distorted current waveform, which needs to be suppressed by a passive damping resistor. Moreover, without an energy storage element, the distributed generations have no short-time power reserve unit for providing an inertial power to support the utility. In order to solve these issues, a novel approach based on a modified virtual synchronous control and a finite control set model predictive control scheme is proposed in this paper. The former is adopted to ensure proper operations in both grid-connected and islanded modes and to emulate the virtual inertial response by drawing inertial power from the input source. The latter utilizes multi-controls of real-time variables to avoid complicated coupling between the input side and the output side controls and to grant the indirect boost matrix converter with the capability of providing active filter resonance damping. Comparative studies between the proposed control and its existing counterpart are conducted with several simulations in PSCAD/EMTDC software to demonstrate the superior performances of the proposed strategy. Finally, the proposed control is verified in a scale-down experiment testbed. INDEX TERMS AC-AC converters, distributed power generations, indirect matrix converter, power control, power system stability, predictive control, virtual synchronous generator.

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Section: ) Vsr Sidementioning

confidence: 99%

Model Predictive Control for Indirect Boost Matrix Converter Based on Virtual Synchronous Generator

et al. 2020

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“…By adding additional zero sequence components u NO1 to the inverter modulation signals, the method can suppress the effect introduced by different transformer turns ratios of the isolation transformer and obtain the desired output voltage as the equal situation. From (26) and (28), when the transformer turns ratios are same, the zero-sequence signal u NO1 equals zero and the modulation signals become exactly same as (16).…”

Section: Output Voltage Derivationsmentioning

confidence: 99%

“…The neutral point current i O is not zero when the dc-link voltage V po is not equal to V on . Then, after some manipulations with (15), (19), (20), (26)- (28) and (30), the following equation could be obtained as…”

Section: Input Current Derivationsmentioning

confidence: 99%

“…Rojas et al [27] also proposed three control schemes based on the predictive control algorithms to compensate for the input voltage unbalance producing good quality input and output current waveforms. Lei et al [28] utilise a feedback control strategy to modify input reference current. Resonant controllers are used to regulate input current and instantaneous active power, so as to directly eliminate the input current harmonics and meanwhile ensure the load absorbing constant active power under unbalanced input voltage.…”

Section: Introductionmentioning

confidence: 99%

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Modified modulation scheme for three‐level diode‐clamped matrix converter under unbalanced input conditions

Zhao

Huang

et al. 2018

IET Power Electronics

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Abstract-The three-level diode-clamped matrix converter topology has outstanding performance under ideal operating conditions. However, input disturbance can influence the waveforms at the output side of the converter due to the direct coupling between the input and output. This paper proposes a modified modulation scheme for three-level diode-clamped matrix converter during operation with unbalanced input voltages and when different transformer turns ratios are used for an isolation transformer at the input. With this modulation technique, sinusoidal and balanced output voltages are guaranteed and the input current harmonics are minimized. Experimental results are presented to demonstrate the feasibility and effectiveness of the proposed modulation scheme.Keywords-Different transformer turns ratios of the isolation transformer, three-level diode-clamped matrix converter, unbalanced input voltages, modified modulation scheme IntroductionMultilevel power converters [1, 2] have a number of advantages including lower output voltage distortion and semiconductor device voltage stress. These features make them very suitable for high-power, high-voltage applications, such as large variable-speed motor drives, high-voltage direct-current transmission, railway traction and manufacturing [3][4][5][6][7]. Matrix converters (MCs) also have advantages such as four-quadrant operation, sinusoidal input and output currents and no large energy storage elements. By combining the advantages of multilevel converters and MCs, the multilevel MCs [8][9][10][11][12][13][14][15][16][17][18][19][20] are receiving a lot of attention.Lots of multilevel MC topologies have been studied, consisting of multi-modular MCs [8][9][10][11][12], diode-clamped MCs [13][14][15][16][17], and capacitor-clamped (flying capacitor) MCs [18][19][20]. The three-level diode-clamped matrix converter (TLDCMC) [16,17] inherits the features of the conventional multilevel inverter and the indirect matrix converter (IMC). The phase opposite disposition (POD) modulation method and phase disposition (PD) modulation method can both be applied to the TLDCMC under the assuming ideal input voltages [16,17]. However, in practice, the input voltages are likely to be unbalanced. Due to the lack of dc-link energy storage, the input disturbance will be transferred directly to the load, thereby influence the quality of the output waveform. Meanwhile, the input current will also become distorted.Several strategies have been proposed to suppress the problems associated with unbalanced input voltages for low voltage MCs. The feed-forward compensation strategy was proposed in [21]. The fluctuation of virtual dc-link voltage is compensated by modifying the modulation index of inverter stage. As a result, balanced sinusoidal output currents are obtained, but the input current distortion is not considered.

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“…Hence the best couple of adjacent switching states I and I of the rectifier stage are selected to minimize g i shown in (11), and then their duty cycles can be calculated using (12).…”

Section: B Cost Function Minimizationmentioning

confidence: 99%

Fixed frequency finite-state model predictive control for indirect matrix converters with optimal switching pattern

Lei

Tarisciotti

Trentin

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-Finite States Model Predictive Control (MPC) hasbeen recently applied to several converters topologies for the many advantages it can provide such as fast dynamics, multitarget control capabilities, easy implementation on digital control board and capability of including constraints in the control law. However, its variable switching frequency and lower steady state waveform quality, with respect to standard control plus modulator systems, represents a limitation to its applicability. Modulated Model Predictive Control (M 2 PC) combines all the advantages of the simple concept of MPC together with the fixed switching frequency characteristic of PWM algorithms. In particular this work focuses on the Indirect Matrix Converter (IMC), where the tight coupling between rectifier stage and inverter stage has to be taken into account in the M 2 PC design. This paper proposes an M 2 PC solution, suitable for IMC, with an optimal switching pattern to emulate the desired waveform quality features of Space Vector Modulation (SVM). In the optimal pattern, the switching sequences of the rectifier stage and inverter stage are rearranged in order to always achieve zerocurrent switching on the rectifier stage, thus simplifying its commutation strategy. In addition, the optimal pattern enables M 2 PC to produce sinusoidal source current, sinusoidal output current and maintain all desirable characteristics of MPC.

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Feedback Control Strategy to Eliminate the Input Current Harmonics of Matrix Converter Under Unbalanced Input Voltages

Cited by 38 publications

References 24 publications

Model Predictive Control for Indirect Boost Matrix Converter Based on Virtual Synchronous Generator

Model Predictive Control for Indirect Boost Matrix Converter Based on Virtual Synchronous Generator

Modified modulation scheme for three‐level diode‐clamped matrix converter under unbalanced input conditions

Fixed frequency finite-state model predictive control for indirect matrix converters with optimal switching pattern

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