A Digital Hysteresis Current Control for Half-Bridge Inverters with Constrained Switching Frequency

Nguyen-Van, Triet; Abe, Rikiya; Tanaka, Kenji

doi:10.3390/en10101610

Cited by 31 publications

(22 citation statements)

References 21 publications

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“…Another variant is also described in the same work, an inverter from a single input source. This scheme is similar to the traditional half-bridge inverters [92], noting that it does not require a higher input voltage, with the use of two capacitors C 1 and C 2 . The modes of operation are presented in Figure 12.…”

Section: Single-stage Buck-boost Invertersmentioning

confidence: 99%

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

et al. 2020

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The rise in renewable energy has increased the use of DC/AC converters, which transform the direct current to alternating current. These devices, generally called inverters, are mainly used as an interface between clean energy and the grid. It is estimated that 21% of the global electricity generation capacity from renewable sources is supplied by photovoltaic systems. In these systems, a transformer to ensure grid isolation is used. Nevertheless, the transformer makes the system expensive, heavy, bulky and reduces its efficiency. Therefore, transformerless schemes are used to eliminate the mentioned disadvantages. One of the main drawbacks of transformerless topologies is the presence of a leakage current between the physical earth of the grid and the parasitic capacitances of the photovoltaic module terminals. The leakage current depends on the value of the parasitic capacitances of the panel and the common-mode voltage. At the same time, the common-mode voltage depends on the modulation strategy used. Therefore, by the manipulation of the modulation technique, is accomplished a decrease in the leakage current. However, the connection standards for photovoltaic inverters establish a maximum total harmonic distortion of 5%. In this paper an analysis of the common-mode voltage and its influence on the value of the leakage current is described. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. A comparative table with the most important aspects of each converter is shown based on number of components, modes of operation, type of modulation strategy used, and the leakage current value obtained. It is important to mention that analyzed topologies present a variation of the leakage current between 0 to 180 mA. Finally, the trends, problems, and researches on transformerless grid-connected PV systems are discussed.

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Section: Single-stage Buck-boost Invertersmentioning

confidence: 99%

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

et al. 2020

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“…Multiple tuned filters are made by combining individual single tuned filters to obtain the desired frequency response. High pass filters are used to redirect all highfrequency harmonics which are usually observed in switching converters [9]- [10]. Some common configurations of shunt PPFs and its corresponding frequency response are shown in Fig.…”

Section: ) Shunt Passive Power Filtersmentioning

confidence: 99%

Enhancement of Power Quality in Domestic Loads Using Harmonic Filters

Sanjan¹,

Gowtham²,

Bhaskar

et al. 2020

IEEE Access

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This study deals with the mitigation of current harmonics, which is primarily important to alleviate power quality problems in modern times. Current harmonics produced by different widely used loads have been evaluated and related parameters have been tabled. Using the data obtained, a non-linear load was modelled to serve as the test load. Different mitigation solutions and techniques were studied to select an appropriate filter design for domestic single-phase application. The Active Power Filter (APF)'s steady-state and dynamic output was evaluated with reference current extraction techniques like PQ and SRF theories in Simulink. For a fair comparison, various parameters related to the filter design were kept identical between the tests conducted; and to test the dynamic performance, a highly inductive load was connected halfway through simulation. The reactive power compensation offered by the filter was studied by using various waveforms and parameters are investigated and tabulated. The study was carried out to identify a reference current extraction technique that yields the best performance and understand the implementation of the same to identify inherent issues that can sometimes be overlooked because of their simplicity and ease of implementation. The performance of two commonly used reference current extraction techniques were analyzed by subjecting it to highly non-linear and highly inductive loads that were modelled based on various loads that were analyzed.

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“…However, a drawback of this technique is the non-constant switching frequency, that may lead to unwanted heavy interferences [18]. The adaptive hysteresis current control technique, which can achieve the constant switching frequency, has been presented in the pieces of literature [19][20][21]. The hysteresis current band in this technique is calculated adaptively using the measured output voltage and the desired constant switching frequency as:…”

Section: Adaptive Hysteresis Current Controlmentioning

confidence: 99%

Digital Adaptive Hysteresis Current Control for Multi-Functional Inverters

2018

Self Cite

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This paper proposes a digital adaptive hysteresis current control method for multi-functional inverters in a power-flow control device called digital grid router. Each inverter can be controlled in master, grid-connected, or stand-alone modes, which can be specified by the controller. While the popular linear sine-triangle pulse width modulation (SPWM) control technique requires complicated proportional-integral (PI) regulators with an unavoidable time delay, hysteresis current control has a simple structure, fast responses, and robustness due to its independent system of parameters. Since the hysteresis current control method controls the output current stay around the reference current directly, in the multi-functional inverter, the reference output is not given by a current directly. Thus, the reference current used to implement the hysteresis current control in this study is calculated from the given reference voltage or power in each control mode. The controller uses high-speed sampled data at MHz level and is implemented by using a field-programmable gate array (FPGA). Experimental results show good performances of the proposed controller in controlling power exchanges in the digital grid router.

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A Digital Hysteresis Current Control for Half-Bridge Inverters with Constrained Switching Frequency

Cited by 31 publications

References 21 publications

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

Enhancement of Power Quality in Domestic Loads Using Harmonic Filters

Digital Adaptive Hysteresis Current Control for Multi-Functional Inverters

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