Current reconstruction method for PMSM drive system with a DC link shunt resistor

Yeom, Han-Beom; Ku, Hyun-Keun; Kim, Jang-Mok

doi:10.1109/ecce.2016.7854980

Cited by 5 publications

(11 citation statements)

References 10 publications

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“…The current reconstruction method, using average current estimation, is not applicable in Area 2 to Area 4. The proposed current estimation method, by using the current reference [19], is a reconstruction method for the current that cannot be obtained from the shunt resistor in the unmeasurable region of the 1-shunt inverter. The estimated current can be simply obtained by using the electrical model of the motor.…”

Section: The Current Estimation Methods Using Current Reference In Thementioning

confidence: 99%

“…Trajectory of the voltage reference vector and the proposed sampling voltage in Area 4: (a) Trajectory of V s * dq and V s ; (b) V s and the border line.As shown inFigure 9b, the phase angle θ of the sampling voltage vector V s is equal to that of the voltage reference vector V s * dq in the x-y coordinate system. The line of the sampling voltage V s is derived as in Equation(19), line 1. As the angle of the border line of star area is 60 • where 0 • ≤ θ ≤ 30 • and the x-intercept of this line is 2∆V √ line 2 is derived as in Equation(20) inFigure 9b.line1 : y = tan θ • x(19)…”

mentioning

confidence: 99%

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A Current Reconstruction Strategy Following the Operation Area in a 1-Shunt Inverter System

Park

Kim

Yeom³

et al. 2019

Energies

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To reduce the cost of the inverter system in home appliances, a method using a shunt resistor at the DC-link can be substituted for a method using two current sensors at the inverter output. However, the minimum time of the active vector is required to sample the accurate current using a 1-shunt resistor. Therefore, many studies have been conducted investigating current reconstruction methods in the unmeasurable region of the current. The conventional methods using voltage injection have some problems such as high THD (Total Harmonic Distortion) and acoustic noise, because the PWM pattern is shifted. In addition, the current reconstruction is inaccurate in a low modulation region. In this paper, the cause of the noise in conventional methods is analyzed and a simple current reconstruction method based on an average current estimation and a current reference is utilized for reducing acoustic noise. In an immeasurable area, especially a low modulation region, an intermittent PWM shift method is proposed to enhance the accuracy of the reconstructed current. Therefore, a control strategy that combines all of the mentioned methods is implemented for the entire operating range. The effectiveness of the proposed methods is verified through the experimental results and the results of sound measurement in an anechoic chamber are included to compare with the acoustic noise.

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Section: The Current Estimation Methods Using Current Reference In Thementioning

confidence: 99%

mentioning

confidence: 99%

A Current Reconstruction Strategy Following the Operation Area in a 1-Shunt Inverter System

Park

Kim

Yeom³

et al. 2019

Energies

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“…In addition, Figure 4 shows the switching vector in the spatial coordinates of the hexagon. Figure 4 and Table 1 show that the current cannot be measured through the neutral-point shunt resistor during the zero vector (V 0 ) and space vectors represented by Previous research has established the effective voltage time by shifting the pulse width modulation (PWM) or injecting the voltage to restore the current [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. However, these methods cause a high total harmonic distortion (THD) by injecting relatively large voltages.…”

Section: Acquiring Phase Current From Neutral Shunt Resistormentioning

confidence: 99%

“…However, although the active vectors are combined with "O" or "N" switching states, the phase current cannot be measured due to the short dwell time of the active vectors. The portion in the space vector diagram where the dwell time of the active vectors is not large enough to measure the current is called the current-unmeasurable area (CUA) [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. A shunt resistor at the neutral point of the three-level NPCI can be used to measure the phase current, as shown in Figure 2c.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Phase Current Reconstruction Method for a Three-Level Neutral Point Clamped Inverter (NPCI) with a Neutral Shunt Resistor

Son

Kim

2018

Energies

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This paper presents three phase current reconstruction methods for a three-level neutral point clamped inverter (NPCI) by measuring the voltage of a shunt resistor placed in the neutral point of the inverter. In order to accurately acquire the phase currents from the shunt resister, the dwell time of the active voltage vectors need to exceed the minimum time. On the other hand, if the time of active voltage is shorter than the minimum time, the current measurement becomes impossible. In this paper, unmeasurable regions for current are classified into three areas. Area 1 is a region in which both phase currents can be measure. Therefore, it is not necessary to restore the current. In Area 2, only one phase current can be measured. Thus, an estimation or restoration method is needed to measure another phase current. In this paper, the current estimation method using an electrical model of the motor is proposed. Area 3 is the region in which both phase currents can not be measured. In this case, it is necessary to move the voltage vector to the current measurable area by injecting the voltage. In this paper, Area 3 is divided into 36 sectors to inject optimal voltage. The proposed methods have the advantages of high current measurement accuracy and low THD (total harmonic distortion). The effectiveness of the proposed methods are verified through experimental results.

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Overmodulation Strategy Using DC-Link Shunt Resistor Inverters to Maintain Output Voltage Linearity

Kwon¹,

Son

Lim

et al. 2021

IEEE Access

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To detect the three-phase current in the complex plane of a DC link shunt inverter, an algorithm for restoring the current is required. In this paper, a method of dividing the detection voltage and the compensation voltage to match the output voltage as much as possible to reduce the total harmonic distortion while restoring the current is proposed. In addition, an overmodulation algorithm for a 12-step output, which corresponds to the largest voltage in a DC link shunt inverter, is proposed, and a current recovery method in the overmodulation region is proposed. To determine how to ensure a linear output voltage, the fundamental frequency of the output voltage is analyzed through a Fourier series, and a new voltage vector whose fundamental frequency amplitude is equal to the amplitude of the command voltage is calculated. Finally, the performance of the proposed algorithm is verified through simulation and experimentation. The output of a motor was increased by using overmodulation, and the harmonics of the current based on the output voltage were analyzed through a Fourier series.

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Current reconstruction method for PMSM drive system with a DC link shunt resistor

Cited by 5 publications

References 10 publications

A Current Reconstruction Strategy Following the Operation Area in a 1-Shunt Inverter System

A Current Reconstruction Strategy Following the Operation Area in a 1-Shunt Inverter System

A Novel Phase Current Reconstruction Method for a Three-Level Neutral Point Clamped Inverter (NPCI) with a Neutral Shunt Resistor

Overmodulation Strategy Using DC-Link Shunt Resistor Inverters to Maintain Output Voltage Linearity

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