A Lyapunov Stability Theory-Based Control Strategy for Three-Level Shunt Active Power Filter

Cao, Yijia; Xu, Yong; Li, Yong; Yu, Jiaqi; Yu, Jingrong

doi:10.3390/en10010112

Cited by 9 publications

(12 citation statements)

References 30 publications

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“…Therefore, the independent states space equation, for example, = 1 and = 2 and solving Eq. (5) and (6)…”

Section: Mathematical Analysis Of 3φ Psi Systemsmentioning

confidence: 99%

“…The regulators are applied synchronously, turning in the reference frame utilizing a DC regulator, PI regulator or in a-b-c to d-q-0 frame employed deadbeat regulator or hysteresis regulator. A PLL based current regulator system executed in the synchronously turning reference frame is designed in [6]. These papers assume the inverter input voltage from ESG and balance the microgrid voltage and current to microgrid networks.…”

Section: Introductionmentioning

confidence: 99%

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PLL-Based 3? Inverter Circuit for Microgrid System Operated by Electrostatic Generator

Motakabber¹,

Rahman²,

Ibrahimy³

et al. 2019

IIUMEJ

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A current source control based PLL (phase lock loop) technique is one of the most efficient methods for modern 3? synchronized grid power systems. When an inverter circuit is driven by an electrostatic generator with wind power, it encounters some problems, such as static and dynamic turn-on-off switching losses, unbalanced source voltage, low continuous current, higher frequency harmonic distortion, phase angle imbalance, etc. To solve these problems, a series of connected switching inverter modules technique is proposed. It is not only a traditional inverter system, but it also works as a low-frequency ripple current inverter with lower switch losses. A new topology of phase synchronous inverter (PSI) is designed using a PLL current source controller. The input voltage source of the PSI is a high DC voltage from an electrostatic generator (ESG). The modified ESG is capable of generating the HVDC and a continuous moderate amount of current. The proposed switching topology of the inverter is able to control the microgrid power as well as reduce the dynamic and static switching loss. It also reduces the high-frequency harmonic distortion and improves the phase angle error. The output LCL lowpass filter scheme of the inverter is designed to reduce the total harmonic distortion of 1.62%. The PSI circuit is designed and simulated using MATLAB software. In the developed system, the input voltage of 8 k , microgrid frequency of 50Hz, switching frequency of the carrier of 10 kHz, and modulation index of 0.85 are considered to be implemented. The proposed novel microgrid connected PSI switching module design technique has significantly enhanced the power stability. The overall system efficiency improved by 95.52%. ABSTRAK: Sumber-arus terkawal berdasarkan teknik PLL (fasa litar kunci) adalah satu kaedah cekap bagi sistem moden tenaga grid selaras 3?. Apabila litar songsang (inverter) digerak menggunakan penjana elektrostatik bersama tenaga angin, ia mengalami masalah seperti kehilangan tenaga statik dan dinamik suis hidup-mati, sumber voltan yang tidak seimbang, kurang arus terus, gangguan harmoni frekuensi tinggi, ketidak-seimbangan sudut fasa, dan sebagainya. Bagi menyelesaikan masalah ini, teknik modul suis bersiri dihubung bersama inverter telah dicadangkan. Ini bukan semata-mata teknik lama sistem inverter, tetapi ia juga berfungsi sebagai arus tidak tetap frekuensi-rendah dengan kurang kehilangan tenaga pada suis inverter. Topologi baru fasa inverter tetap (PSI) ini telah direka menggunakan kawalan sumber arus PLL. Sumber voltan masuk PSI ini telah digunakan daripada voltan DC tinggi penjana elektrostatik (ESG). ESG yang diubah suai ini dapat menghasilkan HVDC dan arus terus yang sederhana. Topologi suis inverter yang dicadang ini dapat mengawal kuasa mikrogrid serta mengurangkan kehilangan dinamik dan statik suis. Ia juga mengurangkan gangguan harmoni frekuensi tinggi dan memperbaiki ketidak-seimbangan sudut fasa. Skim tapisan signal keluar yang rendah pada LCL inverter ini direka bagi mengurangkan total gangguan harmoni sebanyak 1.62%. Litar PSI ini direka dan disimulasi menggunakan perisian MATLAB. Dalam sistem yang dibangunkan ini, 8 kVDCvoltan masuk, 50Hz frekuensi mikrogrid, 10 kHz frekuensi suis angkutan dan 0.85 indeks modulasi telah dipertimbangkan untuk kegunaan. Teknik baru modul suis PSI mikrogrid bersambung yang dicadangkan ini mempunyai kepentingan dalam menstabilkan kuasa dan memperbaiki kecekapan sistem keseluruhan sebanyak 95.52%.

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“…Therefore, the independent states space equation, for example, = 1 and = 2 and solving Eq. (5) and (6)…”

Section: Mathematical Analysis Of 3φ Psi Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PLL-Based 3? Inverter Circuit for Microgrid System Operated by Electrostatic Generator

Motakabber¹,

Rahman²,

Ibrahimy³

et al. 2019

IIUMEJ

View full text Add to dashboard Cite

show abstract

“…This can be accomplished by utilizing the flexibility of the Grid Side Converter (GSC), which is the main component for the integration of rooftop PV systems. Thus, the installation of additional power electronic components such as shunt, series and series-parallel (unified power quality conditioner) active power filters [1][2][3][4][5][6] can become unnecessary resulting in lower installation costs to distribution network operators when dealing with such abnormal grid conditions. The necessary power electronics required for the mitigation of abnormal grid conditions are already present in the GSC of a PV system and can be utilized by providing it with advanced functionalities through flexible control algorithms.…”

Section: Introductionmentioning

confidence: 99%

Multi‐functional distributed generation control scheme for improving the grid power quality

Ali

Christofides

Hadjidemetriou

et al. 2019

IET Power Electronics

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The large-scale integration of renewable energy sources require routine planning. Renewable sources are expected to be a key element of future power systems. With many challenges ahead, thinking out of the box is necessary in order to equip the power system with additional advanced functionalities and capabilities to combat the anticipated challenges. The associated equipment of distributed generation can be seen as a grid asset upgrade because of the increased number of elements connected to the grid, such as grid side converters (GSC) of photovoltaics and battery storage systems. It therefore makes sense to think of ways to diversify the role of distributed renewables in a way that benefits the grid, consumers, and prosumers in terms of power quality. In parallel with the diversified role of distributed renewables, this approach can be also thought of as a systematic process of developing, operating, maintaining and upgrading the grid. The work proposes an advanced, multi-function GSC control technique for improving the distribution grid power quality by enabling the injection of asymmetric, DC and harmonic currents in case it is needed. Injecting for example such currents locally through the GSC of a residential photovoltaic system can compensate undesired characteristics of the prosumer loads in order to allow the flow of symmetric and high quality currents between the prosumer and the distribution grid (irrespective of the load conditions). The proposed control technique consists of a Phase-Locked Loop (PLL) necessary for synchronization purposes and advanced PQ and current controllers necessary for injecting the reference currents. Experiments and simulation results are presented to validate the performance of proposed control technique.

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“…Such a grid friendly operation can be enabled by the grid side converter (GSC), which is an inherent component of any PV rooftop system. The additional installation of power electronics equipment (such as series [2,3] or shunt active power filters [4,5]) is not necessary, reducing therefore the cost to DN operators when they have to deal with such problems. Hence, it is more cost-effective to use the existing GSC for delivering the produced PV power into the gird and in addition, to perform advanced functional modes for mitigating the asymmetries and harmonics caused by nearby loads.…”

Section: Introductionmentioning

confidence: 99%

Diversifying the Role of Distributed Generation Grid-Side Converters for Improving the Power Quality of Distribution Networks Using Advanced Control Techniques

Ali

Christofides

Hadjidemetriou

et al. 2019

IEEE Trans. on Ind. Applicat.

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Diversifying the role of grid side converters (GSC) associated with distributed generation (DG) may have a technical and economic impact. The increasing number of residential photovoltaic systems can be exploited by distribution network (DN) operators in order to support and improve the power quality of the grid without considerable further capital investment. The GSC can support the grid during abnormal conditions but may also be used to improve the DN power quality by balancing out asymmetries and alleviating the grid from undesired harmonics. The proposed advanced control technique demonstrates through simulation and experimental results that the role of GSC can be upgraded to improve the power quality of the grid. Furthermore, the proposed control scheme is validated on a realistic low-voltage DN using data from the Cyprus Electricity Authority. Consequently, conventional practices by distribution network operators for improving the power quality can be reassessed as the necessary power electronics hardware for mitigating grid problems are already present within the GSCs of DG systems.

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A Lyapunov Stability Theory-Based Control Strategy for Three-Level Shunt Active Power Filter

Cited by 9 publications

References 30 publications

PLL-Based 3? Inverter Circuit for Microgrid System Operated by Electrostatic Generator

PLL-Based 3? Inverter Circuit for Microgrid System Operated by Electrostatic Generator

Multi‐functional distributed generation control scheme for improving the grid power quality

Diversifying the Role of Distributed Generation Grid-Side Converters for Improving the Power Quality of Distribution Networks Using Advanced Control Techniques

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