A New Single-Phase AC Voltage Converter With Voltage Buck Characteristics for Grid Voltage Compensation

Ashraf, Naveed; Izhar, Tahir; Abbas, Ghulam; Awan, Ahmed Bilal; Farooq, Umar; Balas, Valentina E.

doi:10.1109/access.2020.2979506

Cited by 17 publications

(29 citation statements)

References 42 publications

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“…The average and rms current stresses are detailed here for all switching devices by following the same procedure developed in [19]. In all operating modes of the suggested topology, low frequency switching transistors (Q1 to Q4) and diodes (D1 to D4 and D7 to D8) conduct only for half cycle in one cycle of the input or output voltage.…”

Section: B Dynamic Behaviour For Inverting Operating Modesmentioning

confidence: 99%

“…The switching and conduction losses are computed with the similar approach developed in reference [17], [19], and [24]. The switching losses depend on the instantaneous value of the switching voltage, current, and frequency.…”

Section: B Dynamic Behaviour For Inverting Operating Modesmentioning

confidence: 99%

“…Also, its operation is only being realized in buck and buck-boost mode. The conduction of one transistor and one diode is eliminated in the converter as discussed in [19]. But this converter is operated only in buck mode with bipolar voltage characteristics.…”

Section: Introductionmentioning

confidence: 99%

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An Improved Bipolar Voltage Boost AC Voltage Controller With Reduced Switching Transistors

et al. 2021

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Single-stage power conversion with simple circuit arrangement is one of the attractive features of direct bipolar voltage ac-ac converters. This increases their potency in various applications that require voltage and frequency regulation. The grid voltage compensators, direct variable speed ac-ac drives, and induction heating systems require inverting and non-inverting operation of the input voltage. Their size, cost, and circuit complexity directly depend on the number of switching transistors, as the operation of each transistor requires the use of one gate drive circuit (GDC) and one isolated dc power supply (IDCPS). The size and cost of GDC and IDCPS are much larger than that of switching transistors. The use of fewer switching transistors also ensures low conversion losses and simplifies the switching schemes. Therefore, this research proposes a new ac-ac converter that is realized as a bipolar boost ac voltage controller having a low count of switching transistors. The suggested topology also eliminates the shoot-through of the input source or output filtering capacitor. The characteristics of the proposed circuit are explored through simulation results obtained through the Simulink platform. The confirmation of the simulation results is validated through the laboratory prototype.INDEX TERMS AC converter, bipolar voltage, grid voltage compensator, induction heating system, shoot through.

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Section: B Dynamic Behaviour For Inverting Operating Modesmentioning

confidence: 99%

Section: B Dynamic Behaviour For Inverting Operating Modesmentioning

confidence: 99%

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An Improved Bipolar Voltage Boost AC Voltage Controller With Reduced Switching Transistors

et al. 2021

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“…During the sensitive industrial process, there are numerous control and motor driving equipment that are sensitive to voltage sag and power supply interruption. Equipment failure caused by a voltage sag or interruption event will often lead to disruption of production and serious comprehensive economic losses [1]- [5]. The development of loss assessment and the design of the treatment scheme is based on the effective assessment of voltage sag and interruption immunity during the process of production.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Scheme of Voltage Sag Immunity in Sensitive Industrial Process

2021

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In order to enhance the effectiveness of voltage sag governance and the practicability of the process immunity assessment method, an immunity assessment method for the assembly line process is proposed, fully considering the relationship between logistics line and power line, and thoroughly portraying the relationship between equipment and its links in depth. Combined with the existing voltage tolerance curve test results, the power line immunity time is reasonably evaluated considering the response delay of each device. In addition, the fault probability is quantified considering the possibility of equipment failure and its link repairing. On this basis, the minimal cut-set method is adapted to standardize the constructed random network of logistics lines. The immunity of the whole manufacturing process is evaluated through series-parallel logical analysis. In the end, the paper mill is taken as a sample to illustrate the proposed method. The deviation between the average annual economic loss obtained from model evaluation and this typical producer's survey loss is regarded as the basis for the measurement of the effectiveness of the method. The results show that the immunity of the process can be accurately evaluated for the deviation of the evaluation obtained by the proposed method is relatively small. INDEX TERMSVoltage sag, voltage tolerance curve, process immunity time, minimal cut set.

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“…of power converters that are very sensitive to amplitude and frequency voltage drifts. Amplitude variation is being studied as sag/swell disturbances, [9], [10], however, frequency changes may compromise the power converters stability due to the passive filter's sensitivity to these kinds of variations [11]. In addition, when the grid frequency changes, the total descriptor function of the power converter also changes.…”

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confidence: 99%

A Simple Self-Tuning Resonant Control Approach for Power Converters Connected to Micro-Grids With Distorted Voltage Conditions

et al. 2020

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Over the last few decades, the consolidated goal of reducing greenhouse gasses has increased the relevance of renewable energy research, electromobility, energy storage, and distributed generation, micro-grids, among others. Micro-grids, systems working in islanding mode, are particular cases where some disadvantages are present due to the wide variations which may appear across their electrical quantities. Variations on the voltage amplitude and the frequency are intrinsic in the operation of weak grids, because they have low inertia and therefore the load must be able to cope with these variations, otherwise loads may trip electrical system protection. Particularly, on power electronic drives, these frequency deviations will lead to increased system nonlinearities, entailing a more critical controller design. To overcome these issues, this paper presents an implementation of a resonant controller with self-tuned gains. The strategy imposes a constant sampling time which allows these controllers to be used in variable frequency environments. In addition, the computational capacity required for the digital board is also considered. The simulated and experimental results provided demonstrate the good performance of this proposal. INDEX TERMS Resonant control, variable frequency environment, micro-grids. I. INTRODUCTION A. Research gap Power Generation has gained popularity in recent years due to the need to generate electric power in alternate directions and from varying kinds of sources. [1], [2]. However, power management for these systems results in a difficult task, as some sources may be working at the maximum power point of injection regardless of the actual power consumption, for example, renewable energies. Therefore, power generation and power consumption may differ, resulting in the global system being out of balance [3]. This problem becomes critical when power systems are small micro-grids, which are usually noted as being low inertia systems. In these cases, ineffective power management leads to variations on the voltage amplitude, mainly associated to the reactive power, and frequency variations, due to active power regulation. In addition, weak grid systems will feature these issues when large loads are either connected or disconnected, making the voltage vary in amplitude and frequency, which are typical occurrences in aircraft and ship power systems [4]-[6]. Electric devices connected to these kinds of sources should be robust under these variations, thus helping to hold the system stability and avoid tripping the inbuilt protections.

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A New Single-Phase AC Voltage Converter With Voltage Buck Characteristics for Grid Voltage Compensation

Cited by 17 publications

References 42 publications

An Improved Bipolar Voltage Boost AC Voltage Controller With Reduced Switching Transistors

An Improved Bipolar Voltage Boost AC Voltage Controller With Reduced Switching Transistors

Evaluation Scheme of Voltage Sag Immunity in Sensitive Industrial Process

A Simple Self-Tuning Resonant Control Approach for Power Converters Connected to Micro-Grids With Distorted Voltage Conditions

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