Design of a passive damped filter for harmonic reduction in multilevel inverters used in PV applications
01 Dec 2018-
TL;DR: A modified methodology to arrive at the value of damping resistance for harmonic reduction with minimum losses is used, which proves the effectiveness of the resistive damped passive filter for multilevel inverters.
Abstract: passive filter is connected at the output of a voltage source inverter in standalone and grid connected applications to reduce harmonics. This paper presents a parameter design procedure of a passive LC filter containing a damping resistor for a five level inverter. The work aims to improve the output waveforms of the inverter and reduce the total harmonic distortion content on its output waveforms. The design is carried out with an objective to provide better attenuation of switching frequency harmonics and effective suppression of resonant peaks. All equations derived are simple and accurate which provides insight into design of passive LC filter with resistance damping without cumbersome algorithms. This work uses a modified methodology to arrive at the value of damping resistance for harmonic reduction with minimum losses. The modified method considers quality factor, resonant peaking, harmonic attenuation rate and power loss in the damping branch to select the resistance value. Simulation and experimental results are included to analyse the harmonic distortion on the output waveforms. Experiments have been conducted on a five level cascaded H-Bridge inverter set up. The modulation scheme is implemented on a FPGA platform using SPARTAN 3E-XCS250E controller. A very good agreement is seen between the experimental and simulation results of the developed filter design. The results prove the effectiveness of the resistive damped passive filter for multilevel inverters.
Citations
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TL;DR: In this article , the design of 400 Hz power supply using T-type, three-level inverter topology is investigated for aircraft application, which is controlled by space vector pulse width modulation (SVPWM) technique.
Abstract: This paper proposes the design of 400 Hz power supply using T-type, three-level inverter topology. T-type topology is investigated for 400 Hz power supply which is generally used in aircraft application. To generate this power supply, T-type inverter is controlled by space vector pulse width modulation (SVPWM) technique. The design of output passive filter with its damping components is also given in this paper to reduce the harmonics from the output of the given system. The performance of T-type multi-level inverter is simulated with balanced three-phase resistive and inductive load of 110 kW and also with balanced three-phase resistive load of 55 kW. Various performance parameters like output voltage, output current, it’s %THD, etc., are discussed using PSIM as simulation tool. Hardware prototype of this simulated system is also implemented. This hardware design employs a high-performance digital signal processor (DSP) from Texas Instruments. At last, the simulated results are verified with the experimental results which are taken from the hardware prototype.
01 Jan 2023
TL;DR: In this paper , a single-phase Z-source inverter with an LC filter fed from a photovoltaic source was designed for obtaining a sinusoidal output voltage, which can do both inversion and boosting up operation in a single stage.
Abstract: Power generation using a photovoltaic (PV) array requires two stages of power conversion which includes a DC-DC boost converter followed by an inverter. A Z-source inverter (ZSI) can do both inversion and boosting up operation in a single stage, thus reducing component count, complexity, and cost. This article presents the design of a single-phase ZSI with an LC filter fed from a photovoltaic source. ZSI utilizes shoot through the state to boost the input DC voltage. An impedance circuit consisting of two inductors and capacitors connected in a unique way couples the main inverter circuit with the photovoltaic source. The LC filter has been suitably designed for obtaining a sinusoidal output voltage. The ZSI with the passive filter is experimentally implemented using Field Programmable Gate Array platform. Results obtained from MATLAB simulations and experiments are analyzed.
References
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03 Oct 2003
TL;DR: In this paper, an integrated and comprehensive theory of PWM is presented and the selection of the best algorithm for optimum pulse width modulation is an important process that can result in improved converter efficiency, better load (motor) efficiency, and reduced electromagnetic interference.
Abstract: An integrated and comprehensive theory of PWM. The selection of the best algorithm for optimum pulse width modulation is an important process that can result in improved converter efficiency, better load (motor) efficiency, and reduced electromagnetic interference. However, the identification of the best approach is a complex process requiring extensive mathematical manipulation.
2,450 citations
"Design of a passive damped filter f..." refers methods in this paper
...[5] Holmes, D. G., and Lipo, T.A. “Pulse width modulation for power converters: principles and practice, Hoboken, NJ, USA: Wiley, Oct. 2003, vol. 18, pp. 99-104....
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...Sinusoidal Pulse Width Modulation (SPWM) technique is a popular modulation method for multilevel inverters [5]....
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...Good literature is present for switching pulses generation using PDPWM algorithm [5]....
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...HARMONIC ANALYSIS OF INVERTER OUTPUT The harmonic frequency components of the PWM output waveform is obtained from the analytical procedure developed by Holmes and Lipo [5]....
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...The harmonic frequency components of the PWM output waveform is obtained from the analytical procedure developed by Holmes and Lipo [5]....
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TL;DR: A survey of different topologies, control strategies and modulation techniques used by cascaded multilevel inverters in the medium-voltage inverter market is presented.
Abstract: Cascaded multilevel inverters synthesize a medium-voltage output based on a series connection of power cells which use standard low-voltage component configurations. This characteristic allows one to achieve high-quality output voltages and input currents and also outstanding availability due to their intrinsic component redundancy. Due to these features, the cascaded multilevel inverter has been recognized as an important alternative in the medium-voltage inverter market. This paper presents a survey of different topologies, control strategies and modulation techniques used by these inverters. Regenerative and advanced topologies are also discussed. Applications where the mentioned features play a key role are shown. Finally, future developments are addressed.
2,111 citations
"Design of a passive damped filter f..." refers background in this paper
...Amongst the diverse multilevel inverter circuits, the cascaded H-bridge (CHB) inverter topology is simple and modular [4]....
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16 Jun 2003
TL;DR: In this article, the authors discuss two types of filters: band pass filters and damped filters, and show that in most distribution systems it is practical and economical to implement passive filter designs, provided the required safeguards are considered.
Abstract: New topologies for harmonic mitigation and active filters have come a long way, and these address the line-harmonic control at the source. These mitigate some of the disadvantages of passive filters, however, for nonlinear loads above 1 MW the passive filters are an economical choice. This paper discusses two types of filters: band pass filters and damped filters, which are commonly applied. The operation of these filters is described with respect to the design and system limitations. The operating constraints are then superimposed. The development of this approach shows that there are design limitations and large system changes or modifications can result in higher distortion or even damage to filters in extreme cases. The constraints and limitations that a designer faces in implementing an effective filter design with modern tools of harmonic analysis, measurements, and system analysis are discussed. The paper shows that in most distribution systems it is practical and economical to implement passive filter designs, provided the required safeguards are considered.
625 citations
"Design of a passive damped filter f..." refers background in this paper
...With passive filters, known for their simplicity and low cost, good quality output waveforms can be obtained from PWM inverters [6]-[8]....
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TL;DR: It is shown that versatile stand-alone photovoltaic (PV) systems still demand on at least one battery inverter with improved characteristics of robustness and efficiency, which can be achieved using multilevel topologies.
Abstract: This paper shows that versatile stand-alone photovoltaic (PV) systems still demand on at least one battery inverter with improved characteristics of robustness and efficiency, which can be achieved using multilevel topologies. A compilation of the most common topologies of multilevel converters is presented, and it shows which ones are best suitable to implement inverters for stand-alone applications in the range of a few kilowatts. As an example, a prototype of 3 kVA was implemented, and peak efficiency of 96.0% was achieved.
593 citations
TL;DR: This paper presents a single-phase five-level photovoltaic inverter topology for grid-connected PV systems with a novel pulsewidth-modulated (PWM) control scheme that offers much less total harmonic distortion and can operate at near-unity power factor.
Abstract: This paper presents a single-phase five-level photovoltaic (PV) inverter topology for grid-connected PV systems with a novel pulsewidth-modulated (PWM) control scheme. Two reference signals identical to each other with an offset equivalent to the amplitude of the triangular carrier signal were used to generate PWM signals for the switches. A digital proportional-integral current control algorithm is implemented in DSP TMS320F2812 to keep the current injected into the grid sinusoidal and to have high dynamic performance with rapidly changing atmospheric conditions. The inverter offers much less total harmonic distortion and can operate at near-unity power factor. The proposed system is verified through simulation and is implemented in a prototype, and the experimental results are compared with that with the conventional single-phase three-level grid-connected PWM inverter.
584 citations
"Design of a passive damped filter f..." refers background in this paper
...Multilevel inverters are replacing conventional voltage source inverters in PV based distributed energy systems [1][3]....
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