The theory of instantaneous power in three-phase four-wire systems: a comprehensive approach

Akagi, Hirofumi; Ogasawara, Satoshi; Kim, Hyosung

doi:10.1109/ias.1999.799991

Cited by 197 publications

(111 citation statements)

References 15 publications

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“…Power flow analysis of this system in steady state is similar to that undertaken by Akagi [8] [9]. Considering a non-sinusoidal and unbalanced system, the load power consists of real power p L , imaginary power q L and zero sequence power p L-0 , which consist of an average value and an oscillating value as mentioned above:…”

Section: Po Wer Flo Wmentioning

confidence: 99%

Power Flow in A Load-Current Sensorless Shunt Active Power Filter

Tumbelaka¹

2007

jte

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In this paper, power flow analysis of a three-phase four-wire system with a shunt active power filter in steady state is presented. The analysis begins with a mathematical model of the power inverter and continues to find the relationship of the real and imaginary power as well as zero sequence power in the grid, loads, and the inverter (AC and DC sides) for successful compensation. The system includes mixed non-linear loads with significant unbalanced components. The f ilter consists of a three-phase current-controlled voltage source inverter (CC-VSI) with a filter inductance at the AC output and a DC-bus capacitor. The CC-VSI is operated to directly control the AC grid current to be sinusoidal and in phase with the grid voltage. Computer simulation results verify the concept of the filter and the power flow.Keywords: active power filter, power flow ABSTRAK Dalam makala ini disajikan analisa aliran daya dari sistem tiga-fasa empat-kawat dengan sebuah shunt active power filter dalam keadaan ajek. Analisa dimulai dengan model matematika dari power inverter dan dilanjutkan dengan mencari hubungan antara daya nyata, imajiner, dan urutan nol pada sumber, beban, dan inverter (sisi AC dan DC) untuk proses kompensasi yang berhasil. Dalam sistem ini terdapat bermacam beban tidak linier yang juga tidak seimbang. Sedangkan filternya terdiri dari current-controlled voltage source inverter (CC-VSI) tiga fasa yang dilengkapi dengan induktansi filter pada keluaran AC dan kapasitor DC-bus. CC-VSI beroperasi untuk mengendalikan arus sumber AC secara langsung agar menjadi sinus dan sefasa dengan tegangan sumber. Hasil simulasi komputer bersesuaian dengan konsep dari filter dan aliran daya.Kata kunci:active power filter, aliran daya

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Section: Po Wer Flo Wmentioning

confidence: 99%

Power Flow in A Load-Current Sensorless Shunt Active Power Filter

Tumbelaka¹

2007

jte

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“…In spite of the good behavior of the SRF-PLL under sinusoidal conditions, its performance is deteriorated when the three phase input signal becomes distorted. When the three-phase instantaneous voltage waveforms are transformed from the abc reference frame into the rotating dq reference frame by means of the Park transformation [24,25], the fundamental and (6n±1) th harmonics in the abc reference frame are represented by DC component and 6n th harmonics in the rotating dq reference frame. In the rotating dq reference frame, two low pass filters (LPFs) with high cutoff frequency, e.g.…”

Section: Phase Locked Loopmentioning

confidence: 99%

Communication-less harmonic compensation in a multi-bus microgrid through autonomous control of distributed generation grid-interfacing converters

Ding

Wei

Zhou

et al. 2015

J. Mod. Power Syst. Clean Energy

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This paper proposes a novel approach to compensate buses voltage and current harmonics through distributed generation (DG) interfacing converter in a multibus microgrid. The control approach of each individual DG unit was designed to use only feedback variables of the converter itself that can be measured locally. In the proposed approach, the adjacent bus voltage is indirectly derived from the measured DG converter output voltage, DG line current and line impedance. A voltage closed-loop controller and a current closed-loop controller are designed to achieve both functions of DG real power generation and harmonics compensation. Therefore, the traditional harmonic measurement devices installed at the bus as well as the long distance communication between the bus and the DG converter are not required. The proposed approach can compensate the current harmonics, mitigate the buses voltage distortion and enable the customer devices to be operated in normal conditions within the multi-bus microgrid, and meanwhile relieve the burden of power quality regulator installed at the point of common coupling. Matlab simulations and experimental results are presented to show the operational effectiveness of the proposed approach.

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“…Instantaneous power theory (and variants) determines the harmonic distortion from the instantaneous power calculation in a three-phase system, which is the multiplication of the instantaneous values of the currents and voltages [29]. The calculations may be done in αβ-coordinates as in (5).…”

Section: B3mentioning

confidence: 99%

Evaluation of harmonic detection methods for active power filter applications

Asiminoaei

Blaabjerg

Hansen

Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005.

101

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-In the attempt to minimize the harmonic disturbances created by the non-linear loads the choice of the active power filters comes out to improve the filtering efficiency and to solve many issues existing with classical passive filters. One of the key points for a proper implementation of an active filter is to use a good method for current/voltage reference generation. There exist many implementations supported by different theories (either in time-or frequency-domain), which continuously debate their performances proposing ever better solutions. This paper gives a survey of the common used theories. Then, the work here proposes a simulation setup that decouples the harmonic reference generator from the active filter model and its controller. In this way the selected methods can be equally analyzed and compared with respect to their performance, which helps anticipating possible implementation issues. The conclusions are collected and a comparison is given at the end, which is useful in deciding the future hardware setup implementation. The comparison shows that the choice of numerical filtering is a key factor for obtaining good accuracies and dynamics for an active filter.

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The theory of instantaneous power in three-phase four-wire systems: a comprehensive approach

Cited by 197 publications

References 15 publications

Power Flow in A Load-Current Sensorless Shunt Active Power Filter

Power Flow in A Load-Current Sensorless Shunt Active Power Filter

Communication-less harmonic compensation in a multi-bus microgrid through autonomous control of distributed generation grid-interfacing converters

Evaluation of harmonic detection methods for active power filter applications

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