Improved Control Method for Voltage Regulation and Harmonic Mitigation Using Electric Spring

Shademan, Mahdi; Jalilian, Alireza; Savaghebi, Mehdi

doi:10.3390/su13084523

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…In addition, some trapping algorithms, observers, and controller parameter optimization can also suppress the corresponding harmonic components [28][29][30][31][32]. In [33], the state space matrix explains the participation degree of the control loops, and a controller design method is proposed considering the current harmonic distortion rate.…”

Section: Introductionmentioning

confidence: 99%

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

Yang¹,

Liu²,

Shan

et al. 2023

Applied Sciences

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Under the current trend of power electronics in energy systems, a high percentage of renewable energy transports clean energy to the grid through grid-connected inverters. The pulse-width modulation (PWM) technique brings high-order harmonics near to the switching frequency, and LCL filters with low-pass characteristics become the common choice for grid-connected inverters. However, the low-order harmonics caused by nonideal switching characteristics are difficult to filter out, and the new resonance point introduced by the LCL filter causes a security problem for the energy systems. Firstly, the generation mechanism of the 6 k ± 1 order harmonic and high-frequency resonance from a PV grid-connected inverter is analyzed. Then, a virtual resistor is constructed by the active damping method to absorb the resonant component. Meanwhile, this paper also presents an adaptive modulation voltage compensation method to decrease the low-order harmonics. Finally, the actual measured data of user photovoltaic (PV) and multiple comparative simulations verify these theories. Simulation results show that the proposed coordinated control algorithm reduces the peak of the resonance point, and the rate of low-order harmonics mitigation is more than 50%. The proposed method is suitable for various operating conditions.

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Section: Introductionmentioning

confidence: 99%

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

Yang¹,

Liu²,

Shan

et al. 2023

Applied Sciences

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“…The dynamic switching in the operation of ES during the voltage regulation activity in the power system may cause distortion on the current and voltage waveforms (Shademan et al, 2021). Considering the effect of a single ES on the power system, its distorting effect on the voltage waveform may be quite limited on grid side.…”

Section: Introductionmentioning

confidence: 99%

Assessment of harmonic mitigation performance of electric springs with different inverter topologies

Duman

Doğanşahin

2022

Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Electric spring (ES) is a new technology inspired by the idea of realization a system that is equivalent to mechanical springs in terms of functionality within power systems. Electric springs are comprised from a DC voltage source, an inverter and an LC filter at the grid side. It can be used effectively in power systems to perform many functions such as voltage regulation, reactive power compensation, demand management and energy storage. On the other hand, due to the semiconductor elements in ES structure, it causes distortion on voltage and current waveforms. However, various control approaches have been proposed in the literature in order to prevent the aforementioned distortions. In this study, three different ESs has been modeled with the inverter topologies chosen from the frequently preferred once used in applications, namely Half-Bridge, Full-Bridge, and Neutral Point Clamped Multi-Level Inverter (NPC-MLI). The disruptive effects of electric springs with different inverter topologies on the grid and their performance in harmonic elimination have been examined through the results obtained from simulations realized in MATLAB/Simulink®.

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“…The development and utilization of solar energy, wind energy and tidal energy will gradually replace the traditional fossil fuels to build an environment-friendly human society [1,2]. Nevertheless, the use of renewable energy [3] will inject harmonics into the power grid.…”

Section: Introductionmentioning

confidence: 99%

A Real-Time Harmonic Extraction Approach for Distorted Grid

Li¹,

Li²,

Li³

et al. 2021

Mathematics

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Harmonic interference is a major hazard in the current power system that affects power quality. How to extract harmonics quickly and accurately is the premise to ensure the sustainable operation of power system, which is particularly important in the field of new energy power generation. In this paper, a harmonic extraction method based on a time-varying observer is proposed. Firstly, a frequency estimation algorithm is used to estimate the power grid current frequency, which can estimate the frequency in real time. Then, applying the zero-crossing detection method to convert the frequency into a phase variable. Finally, using the phase variable and integral current signal as input, a observer is modeled to extract each order harmonic component. The proposed method is evaluated on a FGPA test platform, which shows that the method can extract the harmonic components of the grid current and converge within 80 ms even in the presence of grid distortions. In the verification case, the relative errors of the 1st, 5th, 7th and 11th harmonics are 0.005%, −0.003%, 0.251% and 0.620%, respectively, which are sufficiently small.

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Improved Control Method for Voltage Regulation and Harmonic Mitigation Using Electric Spring

Cited by 4 publications

References 35 publications

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

Assessment of harmonic mitigation performance of electric springs with different inverter topologies

A Real-Time Harmonic Extraction Approach for Distorted Grid

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