Research on Harmonic Current Amplification Effect of Parallel APF Compensating Voltage Source Nonlinear Load

Wei, Xueliang; Li, Cunzhong; Qi, Mingxuan; Luo, Bingyang; Deng, Xiangtian; Zhu, Guorong

doi:10.3390/en12163070

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…Equation (5) shows that if the three phase currents flowing through the filter are equal, the flux generated by one coil will be cancelled by the flux generated by the other coil wound on the same core, so that each series winding presents a low impedance and allows the current to flow smoothly. The current that satisfies this condition is the characteristic of zerosequence harmonic current, which can thus be eliminated from the system current by the filter.…”

Section: Zero-sequence Filtersmentioning

confidence: 99%

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Application analysis of three-phase four-wire system combining adjustable reactance and zero-sequence filter

Zhou,

Zhang,

Shi

2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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This paper presents the design of a power quality governor combining adjustable reactance and zero sequence filter, including a zero sequence filter module, an adjustable reactance module, a zero blocker module, a current sampling module and an MCU intelligent control system. The zigzag transformer module is designed to reduce the current in the neutral line through its own electromagnetic effect in order to achieve power savings. The adjustable reactor is introduced for nonlinear loads and works by sampling the current of each phase of the three-phase circuit, calculating its unbalance through the MCU module to output the corresponding three-phase PWM waveform to adjust the adjustable reactor winding, thus adjusting the three-phase reactor winding connected in series in the three-phase circuit to achieve the purpose of balancing the three-phase load. To address the problem of unbalanced three-phase voltages, a zero resistor is connected in series with the three-phase circuit to produce a large zero-sequence impedance, which reduces the three-phase unbalance current caused by the three-phase unbalance voltage. This paper achieves the goal of reducing the zero sequence harmonic components in the three-phase circuit and reducing the current on the neutral line to achieve power saving.

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Section: Zero-sequence Filtersmentioning

confidence: 99%

“…At present, there are three main ways to reduce harmonics. multiplication, PWM and transformer triangle connection;passive Power Filter (PPF) and Active Power Filter (Active Power Filter-APF) and Hybrid Active Power Filter (Hybrid Active Power Filter-HAPF) [5][6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Application analysis of three-phase four-wire system combining adjustable reactance and zero-sequence filter

Zhou,

Zhang,

Shi

2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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“…To address these issues, power quality regulation devices, such as static var compensator (SVC) (Tang et al, 2024), dynamic voltage restorer (DVR) (Gao et al, 2023), and active power filter (APF) (Zhang et al, 2017), have emerged, which can only solve a single power quality problem. Based on the APF, Japanese scholars proposed the concept of a unified power quality conditioner (UPQC) (Fujita and Akagi, 1996), which combines the functions of DVR and APF and can compensate for multiple power quality problems simultaneously (Wei et al, 2019;Han et al, 2022;Elik and Ahmed, 2023;Lakhdar et al, 2023). How to control the UPQC to better compensate for power quality is currently a significant area of research among scholars.…”

Section: Introductionmentioning

confidence: 99%

Compensation characterization of the UPQC system under an improved nonlinear controller based on the MSTOGI-PLL device

Yu,

Li,

Chu

2024

Front. Energy Res.

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To solve the delay problem of a unified power quality conditioner (UPQC) system during the separation of the fundamental positive-order components and to better filter out the DC and harmonic components to realize accurate phase locking, a mixed second- and third-order generalized integrator phase-locked loop (MSTOGI-PLL) has been designed to replace the traditional synchronous reference frame phase-locked loop (SRF-PLL). Under the premise of adopting the new phase-locking device of MSTOGI-PLL, the active disturbance rejection control (ADRC) controller or the super-twisting algorithm (STA) sliding mode controller is used in the DC voltage control module instead of the traditional PI controller, and the suitability of the two nonlinear controllers with the MSTOGI-PLL device is investigated. First, the new MSTOGI-PLL device is designed, and the new phase-locking method is applied to make the UPQC realize accurate phase locking under the non-ideal situation of the grid voltage containing unbalance, DC component, harmonics, and so on. Based on the above foundation, the ADRC or STA controller is independently adopted to replace the PI controller to construct the UPQC system with the ADRC + MSTOGI phase-locking device and the second-order STA + MSTOGI phase-locking device. Finally, a simulation comparison is carried out in a Simulink simulation platform regarding the UPQC system under different phase-locking devices, and the simulation results demonstrate that MSTOGI-PLL can successfully filter out the DC component and resolve the phase-locking process delay issue. Additionally, the UPQC system with ADRC + MSTOGI-PLL exhibits superior immunity and response speed to the PI controller and the second-order STA controller.

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“…The high-density access of many nonlinear loads causes severe harmonic pollution in the grid [1][2][3]. Even though a single nonlinear load can be regarded as a micro harmonic source, the superposition of a multitude of micro harmonic sources can have significant effects on the grid.…”

Section: Introductionmentioning

confidence: 99%

Optimization Configuration of Grid-Connected Inverters to Suppress Harmonic Amplification in a Microgrid

et al. 2022

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This paper provides insight into the optimal configuration scheme of the grid-connected inverters based on harmonic amplification suppression. The connection of the inverters changes the natural resonance frequencies of the grid. Hence, a reasonable configuration of grid-connected inverters can optimize the impedance distribution and shift the natural resonance frequencies to frequency bands farther away from the harmonic sources. We proposed a scheme of site selection and determination of the number of inverters to suppress harmonic amplification. The resonance frequencies and modal frequency sensitivities (MFSs) were obtained by the resonance modal analysis (RMA). Moreover, the concepts of security region and insecurity region of resonance frequency were illustrated. The grid-connected sites can be obtained by calculating the participation factors (PFs) of the resonance frequencies in the insecurity region. Furthermore, the optimal number was determined by building the Norton equivalent circuit of the inverter and evaluating the output impedance at each frequency. Finally, simulations in Matlab/Simulink based on a modified IEEE-9 bus microgrid were utilized to verify the effectiveness of the proposed scheme.

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Research on Harmonic Current Amplification Effect of Parallel APF Compensating Voltage Source Nonlinear Load

Cited by 9 publications

References 17 publications

Application analysis of three-phase four-wire system combining adjustable reactance and zero-sequence filter

Application analysis of three-phase four-wire system combining adjustable reactance and zero-sequence filter

Compensation characterization of the UPQC system under an improved nonlinear controller based on the MSTOGI-PLL device

Optimization Configuration of Grid-Connected Inverters to Suppress Harmonic Amplification in a Microgrid

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