Improved Elimination Scheme of Current Zero-Crossing Distortion in Unipolar Hysteresis Current Controlled Grid-Connected Inverter

Wu, Fengjiang; Li, Xiaoguang; Duan, Jiandong

doi:10.1109/tii.2015.2470540

Cited by 34 publications

(17 citation statements)

References 19 publications

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“…In the negative power flow interval, no reverse voltage occurs in modulation I. In addition, a current distortion exists at the voltage zero-crossing point when the inverter works under the non-unity power factor operation, particularly for the leading power factor, because the grid voltage cannot sufficiently magnetize the inductor with unipolar SPWM around the voltage zero-crossing point [23]. , and 14(c) represent the conditions of modulation strategy I, modulation strategy II, and the proposed modulation strategy, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Beyond the aforementioned reason, ZCD is caused by switching delay [20] and inadequate inductor excitation [21]. The ZCD issue resulting from neglecting the inductor voltage has been explored in [22], [23]. The analysis of ZCD is strictly under the unity power factor operation and focuses on the transient process.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, while the AC bypass switches is working in power frequency, the AC bypass single-phase inverter is unable to generate reactive power. In accordance with the requirement of the standard VDE-AR-N 4105 [8], grid-tied PV inverters should be able to compensate for the reactive power [23], [24]. To adjust the reactive power, the bypass switches should commutate at a high frequency.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimized Hybrid Modulation Strategy for AC Bypass Transformerless Single-Phase Photovoltaic Inverters

Deng¹,

Sun²,

Yang³

et al. 2016

Journal of Power Electronics

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The full-bridge inverter, widely used for single-phase photovoltaic grid-connected applications, presents a leakage current issue. Therefore, an AC bypass branch is introduced to overcome this challenge. Nevertheless, existing modulation strategies entail drawbacks that should be addressed. One is the zero-crossing distortion (ZCD) of the AC current caused by neglecting the AC filter inductor voltage. Another is that the system cannot deliver reactive power because the AC bypass branch switches at the power frequency. To address these problems, this work proposes an optimized hybrid modulation strategy. To reduce ZCD, the phase angle of the inverter output voltage reference is shifted, thereby compensating for the neglected leading angle. To generate the reactive power, the interval of the negative power output is calculated using the power factor. In addition, the freewheeling switch is kept on when power is flowing into the grid and commutates at a high frequency when power is fed back to the DC side. In this manner, the dead-time insertion in the high-frequency switching area is minimized. Finally, the performances of the proposed modulation strategy and traditional strategies are compared on a universal prototype inverter. Experimental results validate the theoretical analysis.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimized Hybrid Modulation Strategy for AC Bypass Transformerless Single-Phase Photovoltaic Inverters

Deng¹,

Sun²,

Yang³

et al. 2016

Journal of Power Electronics

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show abstract

“…Traditional upside Data demodulation is achieved by judging the difference between the positive and negative values of the current signal in the zero crossing of the voltage [5]. The receiver only set the detection window near the voltage zero crossing.…”

Section: Related Workmentioning

confidence: 99%

A Novel Frequency Communication Technology in Power Distribution Communication Network

2017

ITM Web Conf.

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Abstract. With the expansion of the power terminal access network scale, the main road corridor resources, branch line cable Laying difficulties has become an important factor restricting the construction of the network. In this paper, we focus on the frequency communication technology in power distribution communication network, and design a novel technology in communication mode, error correcting coding and data transfer frame format. We also discuss the influence of voltage phase difference on power frequency communication.Meanwhile, we present the application scenario Electricity information collection, electricity remote control and other power business in smart grid with the novel frequency communication technology.

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“…Current-controlled inverters take the grid-connected current as the control target, and thus can provide high quality current for the utility grid, but they cannot support the grid voltage, especially when the grid experiences disturbances. There are many control strategies used in current-controlled inverters, such as proportional-integral (PI) control, proportional-resonant (PR) control [7], hysteresis control [8], repetitive control [9] and so on. Voltage-controlled inverters take the output voltage or the capacitor voltage as the control target, so they can support the grid voltage and provide active power for sudden load changes, which benefits the grid voltage and frequency stability.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Parameter Design of Voltage-Controlled Inverters Based on Discrete Control

Dong

Han

et al. 2018

Energies

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Grid-connected inverters are widely used to interface renewable energy and energy storage resources into the grid. Voltage-controlled inverters have attracted more and more attention due to their grid-friendly characteristics. The mathematical models of the voltage and current loops are developed in this paper, considering especially the discrete control delay caused by calculation and modulation. In order to suppress the resonance peak in the current loop, the frequency characteristics of the current loop are analyzed in detail. The optimum design flow of the current controller and voltage controller parameters are presented based on numerical analysis, and the stability, dynamic performance and the resonance peak suppression in voltage loop are also considered. Finally, the validity of the mathematical model and the effectiveness of the controller parameters design method are verified by simulation and experimental results.

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Improved Elimination Scheme of Current Zero-Crossing Distortion in Unipolar Hysteresis Current Controlled Grid-Connected Inverter

Cited by 34 publications

References 19 publications

Optimized Hybrid Modulation Strategy for AC Bypass Transformerless Single-Phase Photovoltaic Inverters

Optimized Hybrid Modulation Strategy for AC Bypass Transformerless Single-Phase Photovoltaic Inverters

A Novel Frequency Communication Technology in Power Distribution Communication Network

Modeling and Parameter Design of Voltage-Controlled Inverters Based on Discrete Control

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