A simpler and faster method for SVM implementation

Pablo, Santiago de; Rey, A.B.; Herrero, Luis César; Ruiz, José María Ruiz

doi:10.1109/epe.2007.4417751

Cited by 11 publications

(5 citation statements)

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“…In addition, phases b and c apply the same ideas using different coordinates. The next target of this proposed NVC method is to minimize the common-mode voltage, which may result in a better use of the available DC voltage [54][55][56]. The base states given by (50) of the MMC can be modified by means of (54) by using for the three phases the same redundancy value, named ρ [53].…”

Section: Proposed Nvc Methodsmentioning

confidence: 99%

“…Therefore, in order to reduce the common-mode voltage, the value of ρ given by ( 53) is used to find the minimum average distance of the three phases to the central point given by (Nsm/2, Nsm/2, Nsm/2), constrained by the maximum and minimum values of ρ given by The next target of this proposed NVC method is to minimize the common-mode voltage, which may result in a better use of the available DC voltage [54][55][56]. The base states given by (50) of the MMC can be modified by means of (54) by using for the three phases the same redundancy value, named ρ [53].…”

Section: Proposed Nvc Methodsmentioning

confidence: 99%

“…When the normalized line-to-line coordinates are X = [1, 2, −3], applying (50) delivers the state 320; this means that phase a = 3, phase b = 2 and phase c = 0. Considering the complementary behavior of the upper and lower arms, it indicates three active cells in the lower arm and one active cell in the upper arm for phase a, two active cells in the lower arm and two active cells in the upper arm for phase b, and zero active cells in the lower arm and four active cells in the upper arm for phase c.The next target of this proposed NVC method is to minimize the common-mode voltage, which may result in a better use of the available DC voltage[54][55][56]. The base states given by (50) of the MMC can be modified by means of (54) by using for the three phases the same redundancy value, named ρ[53].…”

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confidence: 99%

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Nearest Vector Control Method Applied to an MMC for PV Generation

Bakir,

de Pablo,

Martinez-Rodrigo

et al. 2024

Energies

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This paper proposes a new and simplified Nearest Vector Control (NVC) modulation technique for a grid-connected photovoltaic (PV) system using a Modular Multilevel Converter (MMC). Compared to the Nearest Level Control (NLC) technique, which defines three independent states for the three phases of medium to large four-wire multilevel converters, NVC offers a more coordinated behavior for three-wire converters. The proposed scheme is easy to implement, and it simplifies the understanding of using vectors when detecting the vector of the converter nearest to a given reference. Because it uses natural coordinates, namely, ab, bc and ca, the proposed method is easier to understand and more useful for further developments. Compared with earlier NVC methods, this approach offers full independence of the number of levels at the converter and it can readily accommodate changes in the number of levels, with no need for lookup tables or artificial coordinate transformations. The proposed NVC method was implemented on a 16-cell MMC used for PV generation and then it was compared to NLC, leading to a smaller and more consistent low-order harmonic distortion, requiring about the same complexity of implementation. Furthermore, in comparison to NLC, when applying the proposed NVC modulation, a behavior more insensitive to changes in the grid voltage was found, the most hazardous odd harmonics from the 5th to the 19th were reduced, and a consistent reduction of about 25 dB was achieved on the 5th and 7th harmonics. The newly proposed method is supported by simulations and experimental results with constant and sharply changing solar irradiance, leaving or removing the 100 Hz component of the MMC circulating currents.

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Section: Proposed Nvc Methodsmentioning

confidence: 99%

Section: Proposed Nvc Methodsmentioning

confidence: 99%

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confidence: 99%

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Nearest Vector Control Method Applied to an MMC for PV Generation

Bakir,

de Pablo,

Martinez-Rodrigo

et al. 2024

Energies

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“…Control software variables are transmitted to the PC via serial port interface. The standard SV-PWM voltage modulation method is used [15] at the frequency of 10 kHz.…”

Section: Methodsmentioning

confidence: 99%

“…2). An exemplary sequence of transistor control signals in a modulation period using Space Vector method (SV-PWM) [15] is presented in Fig. 3.…”

Section: Current Sampling Algorithmsmentioning

confidence: 99%

Indirect Measurement of Motor Current Derivatives in PMSM Sensorless Drives

Jarzębowicz

2014

ElAEE

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Motor current derivatives contain useful information for control algorithms, especially in sensorless electric drives. The measurement of motor current derivatives in electric motors supplied by voltage source inverter can be performed using di/dt transducers. However, in such a solution additional sensors have to be installed, e.g. Rogowski coils. Another approach is to measure current derivatives indirectlyby oversampling the motor currents. In such a method special attention must be paid to determination of current sampling instants. Measurement triggering times must be recalculated in each voltage modulation period with regard to transistors switching. The paper presents different current sampling approaches. Considered oversampling algorithms were experimentally tested in sensorless PMSM drive. The impact of different sampling approaches on the accuracy of rotor position estimation has been discussed.Index Terms-Current measurement, sensorless control, signal sampling, space vector pulse width modulation, variable speed drives.

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