Drawbacks of impedance networks

Rymarski, Zbigniew; Bernacki, Krzysztof

doi:10.1002/cta.2395

Cited by 8 publications

(20 citation statements)

References 36 publications

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“…lower than the efficiency of basic structures. Owing to this decreased efficiency the real boost factor is also much lower than expected [23]. It is worth mentioning that significant differences in recorded levels of radiated disturbances can be expected depending on the type of impedance network structure used [24].…”

Section: Introductionmentioning

confidence: 84%

“…Two basic states were taken into account during analysis and these include the shoot-through and the non-shoot-through states. The shoot-through state is depicted in Figures 2a and 3a, while the non-shoot-through state [23,27,28] is shown in Figures 2b and 3b Further investigation of these improved network structures has shown that the power efficiency of these systems including the decreased efficiency of the inverter is lower than the efficiency of basic structures. Owing to this decreased efficiency the real boost factor is also much lower than expected [23].…”

Section: Basic Impedance Network: Z-source and Qz-sourcementioning

confidence: 99%

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Controlled Energy Flow in Z-Source Inverters

2021

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This paper proposes a method to reduce the output voltage distortions in voltage source inverters (VSI) working with impedance networks. The three main reasons for the voltage distortions include a discontinuous current in the coils of the impedance network, the double output frequency harmonics in the VSI’s voltage output caused by insufficient capacitance in the impedance network, and voltage drops on the bridge switches during the shoot-through time. The first of these distortions can be reduced by increasing the current of the impedance network when the output VSI current is low. This method requires storing energy in the battery connected to the DC link of the VSI during the “non-shoot through” time. Furthermore, this solution can also be used when the Z-source inverter works with a photovoltaic cell to help it attain a maximum power point. The Z-source inverter is essentially a voltage source inverter with the Z-source in the input. In this paper, the theory behind basic impedance networks of Z-source and quasi-Z-source (qZ-source) is investigated where simulations of the presented solutions and experimental verification of the results are also presented.

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Section: Introductionmentioning

confidence: 84%

Section: Basic Impedance Network: Z-source and Qz-sourcementioning

confidence: 99%

Controlled Energy Flow in Z-Source Inverters

2021

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“…In the simplified continuous model (Figure 2), for T s << T m (switching period T s , fundamental period T m ), we can omit the delay, exp(−sT s ), of the PWM modulator (Figure 1). The transfer function of the changes ∆V DC in the V DC voltage supplying the VSI can decrease the result of the distortion of the DC voltage from the impedance network [6,7]. The output impedance of the VSI without a feedback loop Z OUT is calculated in Equation (2), where R LF is an equivalent serial parasitic resistance of the VSI bridge and the filter choke.…”

Section: Analysis Of the Frequency Range Of The Controller Featuresmentioning

confidence: 99%

“…It is possible to calculate the shift of the poles of the characteristic equation of a closed-loop system when we consider this additional feedback loop and determine the final stability of an actual system [4,5]. The distortion of the input DC voltage of the inverter that results from operating different types of DC/DC converters (e.g., impedance networks that cooperate with photovoltaic (PV) modules) should also be considered [6,7]. The main advantage of an SISO solution is its simplicity and low cost because only one trace measuring output voltage with galvanic isolation is required.…”

Section: Introductionmentioning

confidence: 99%

Different Features of Control Systems for Single-Phase Voltage Source Inverters

Rymarski

Bernacki

2020

Energies

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The aim of this paper is to determine which type of control loop is better for each particular type of standard voltage source inverter (VSI) load (static, dynamic, nonlinear rectifier resistive-capacitive RC load). A comparison of three different types of controllers for single-phase VSIs is presented. The first two are of the single input single output (SISO)/proportional-integral-derivative controller (PID) and coefficient diagram method (CDM) types, and the third is of the multi-input single output (MISO)/passivity-based control (PBC) type. The selections of the gains for SISO and MISO controllers are presented, including the problem in the choice of PBC controller gains caused by the imperfection of the pulse width modulation (PWM) modulator. For a standard nonlinear rectifier RC load, the new control quality factor (CQF) is defined to distinguish the properties of the controllers. The results show the superiority of the MISO-PBC controller for the RC load; however, for a linear dynamic load, the MISO-PBC performed worse than the SISO-PID or CDM. Therefore, the choice between either a simple and inexpensive SISO with one measurement trace or an expensive MISO with three measurement traces depends on the purpose of the VSI. The initial simulations and measurements of the experimental models are presented and discussed.

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“…To suppress voltage spikes, improved MCIS inverters 26–30 and voltage‐double MCIS inverters 31 are introduced with additional components. Inspite of high voltage gain, the MCIS inverters have some disadvantages 32 like high start‐up inrush currents, discontinuous input current, high device stresses, no common ground between input and output, and large leakage currents. Additionally, a filter circuit is required at the ac side to improve the waveform quality.…”

Section: Introductionmentioning

confidence: 99%

A cost‐effective single‐phase semi flipped gamma type magnetically coupled impedance source inverters

Gautham

Reddivari

Jena

2020

Circuit Theory & Apps

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Summary This paper presents a new two winding coupled inductor architecture for a semi magnetically coupled impedance source (SMCIS) inverter by connecting the coupled inductor windings in flipped gamma fashion. The proposed topology is derived from the conventional MCIS inverters. It can produce sinusoidal output voltage/current without using any shoot‐through operation and output LC filter, which improves the system reliability. Further, a doubly grounded feature, no start‐up inrush current, reduced component count, low input current ripple, continuous output currents, and small leakage currents are the major advantages of the proposed inverter. However, the proposed semi flipped gamma MCIS inverters still suffer from limited output voltage gain problem. The voltage‐boosting feature is added to the proposed inverter by connecting two converter modules in differential boost configuration through the embedded structure. The voltage‐boosting ability is the major advantage of this differential boost embedded configuration. It has flexibility in choosing a wide range of duty cycle operation from zero to one (whereas, the duty cycle was limited to 0.666 in case of semi‐Z‐source inverter [ZSI]). The modes of operation, design procedure, and feature comparisons of proposed inverters are discussed in this paper. Finally, the effectiveness of proposed inverters is validated through simulation and experimental results in terms of component count, voltage gain, and feature comparison.

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Drawbacks of impedance networks

Cited by 8 publications

References 36 publications

Controlled Energy Flow in Z-Source Inverters

Controlled Energy Flow in Z-Source Inverters

Different Features of Control Systems for Single-Phase Voltage Source Inverters

A cost‐effective single‐phase semi flipped gamma type magnetically coupled impedance source inverters

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