The nearest three virtual space vector PWM - a modulation for the comprehensive neutral-point balancing in the three-level NPC inverter

Busquets‐Monge, Sergio; Bordonau, J.; Boroyevich, Dushan; Somavilla, S.

doi:10.1109/lpel.2004.828445

Cited by 449 publications

(216 citation statements)

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“…The Nearest-three-virtual-vector (NTV 2 ) strategy was first put forward in [12] and then many researchers develop this method [13,14]. The main idea is to synthesize the virtual space vectors, which can produce zero average NP current.…”

Section: Nearest-three-virtual-vectormentioning

confidence: 99%

Improved predictive current control of NPC multilevel inverters

Mao

2016

IEICE Electron. Express

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Abstract:The three-level neutral-point-clamped (NPC) inverter, which is a widely used topology of grid-connected multilevel inverters, suffers the drawback of the NP voltage drift. This paper introduced an improved predictive direct current control strategy to improve grid-connected current quality of the system. The proposed strategy uses the nearest-three-virtualvector (NTV2) modulation strategy which can get rid of the NP voltage balance problem for any range of inverter output voltage. Since the disadvantages of a lot of calculation for NTV2 algorithm in real-time control, the vectors in other sextants are mapped into the first sextant by a simple coordinate transformation. The time derivatives of currents for each selected vectors are used to get the application times that minimize objective function. In addition, comparing with SVPWM approaches the proposed strategy have a constant switching frequency and better line current total harmonic distortion (THD), its validity is verified by the simulation and experiment.

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Section: Nearest-three-virtual-vectormentioning

confidence: 99%

Improved predictive current control of NPC multilevel inverters

Mao

2016

IEICE Electron. Express

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“…If the NPP is not controlled effec-tively, the output voltages of the converter wouldn't reach its reference values and the devices and equipment might be damaged. There are some modulation techniques that are able to completely eliminate the oscillations in NPP [5][6][7]. In [8] a dynamic limiter and a control loop are presented that provide the system with a fast balancing dynamic and guarantee stability under the all operating conditions.…”

Section: Introductionmentioning

confidence: 99%

A New Dual Lagrangian Model and Input/Output Feedback Linearization Control of 3-Phase/Level NPC Voltage-Source Rectifier

2014

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Original scientific paperAn input/output feedback linearization control strategy is developed for control of three-level three-phase neutral-point-clamped rectifier using its dual Lagrangian modeling. The load current of the rectifier can be given in two forms: (i) the load current involving the current of capacitor C1 (ii) the load current involving the current of capacitor C2. Applying the obtained load current to the Euler-Lagrange parameters of the rectifier, two nonlinear models of the system are derived. The models are based on the superposition law of the load current and the Euler-Lagrange description of the rectifier. Also, the two power-balance equations between the input and output sides are obtained by considering the effects of two load currents separately. Then, the two nonlinear models and power-balance equations are linearized using input-output feedback linearization, and the state feedback law controlled inputs are completed by pole placement. With the definition of outputs of the feedback linearization law, the zero dynamics of the system are avoided and a fast output voltages control scheme is designed. Finally, some integrators are added to robust control against parasitic elements. The proposed nonlinear controller is compared to the PI controller and the MATLAB/SIMULINK results verify the proposed control strategy.Key words: Euler-Lagrange (EL) model, 3 level/phase NPC rectifier, Input/output feedback linearization, Powerbalance equations, State feedback law controlled inputs Novi dualni Langrangeov model i upravljanje trofaznim trorazinskim NPC naponskim ispravljačem zasnovano na ulazno/izlaznoj linearizaciji u povratnoj vezi. Upravljačka strategija zasnovana na ulazno/izlaznoj linearizaciji u povratnoj vezi razvijena je za upravljanje trofaznog trorazinskog ispravljača u spoju sa zajedničkom srednjom točkom korištenjem njegova dualnog Lagrangian modeliranja. Struja trošila ispravljača može se prikazati u dvije forme: (i) struja trošila koja uključuje struje obaju kapaciteta C1 (ii) struja trošila koja uključuje samo struju kapaciteta C2. Primjenom dobivene struje trošila na Euler-Lagrangeove parametre ispravljača izvedena su dva nelinearna modela sustava. Modeli su zasnovani na zakonu superpozicije struje trošila i Euler-Lagrangeova opisa ispravljača. Dobivena su dva zakona o ravnoteži snaga izme u ulazne i izlazne strane uzimajući u obzir učinke dvaju struja trošila zasebno. Dva su nelinearna modela i zakoni o ravnoteži snaga zatim linearizirani pomoću ulazno/izlazne linearizacije u povratnoj vezi i ulazi su upravljani s povratnom vezom po varijablama stanja uz metodu odabira polova sustava. Definiranjem izlaza upravljačkog zakona zasnovanog na linearizaciji po povratnoj vezi, zaobišla se dinamika nula u sustavu te je dizajnirana shema s brzim upravljanjem izlaznim naponima. Naposlijetku, integratori su dodani za postizanje robusnosti na parazitske elemente. Predloženi nelinearni regulator uspore en je s PI regulatorom, a rezultati su provjereni u MATLAB/SIMULINK okruženju.Ključne riječ...

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“…In recent year, several modulation strategies for a threelevel NPC VSI have been developed [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. They could be mainly classified into carrier-based pulsewidth modulation (CB-PWM) [11][12][13][14][15][16][17][18], space vector modulation (SVM) [19][20][21][22][23][24][25][26], and selective harmonic elimination (SHE) [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…They could be mainly classified into carrier-based pulsewidth modulation (CB-PWM) [11][12][13][14][15][16][17][18], space vector modulation (SVM) [19][20][21][22][23][24][25][26], and selective harmonic elimination (SHE) [27][28][29][30]. Among these PWM strategies, the CB-PWM has probably been the most popular due to its simplicity of implementation, which based on the comparison between the modulation reference signals and two triangular carriers.…”

Section: Introductionmentioning

confidence: 99%

Modified Unipolar Carrier-Based PWM Strategy for Three-Level Neutral-Point-Clamped Voltage Source Inverters

Srirattanawichaikul¹,

Premrudeepreechacharn²,

Kumsuwan³

2014

Journal of Electrical Engineering and Technology

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-This paper presents a simple modified unipolar carrier-based pulsewidth modulation (CB-PWM) strategy for the three-level neutral-point-clamped (NPC) voltage source inverter (VSI). Analytical expressions for the relationship between modulation reference signals and output voltages are derived. The proposed modulation technique for the three-level NPC VSI includes the maximum and minimum of the three-phase sinusoidal reference voltages with zero-sequence voltage injection concept. The proposed modified CB-PWM strategy incorporates a novel method that requires only of one triangular carrier wave for generate the gating pulses in three-level NPC VSI. It has the advantages of being simplifying the algorithm with no need of complex two/multi-carrier pulsewidth modulation or space vector modulation (SVM) and it's also simple to implement. The possibility of the proposed CB-PWM technique has been verified though computer simulation and experimental results.

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The nearest three virtual space vector PWM - a modulation for the comprehensive neutral-point balancing in the three-level NPC inverter

Cited by 449 publications

References 11 publications

Improved predictive current control of NPC multilevel inverters

Improved predictive current control of NPC multilevel inverters

A New Dual Lagrangian Model and Input/Output Feedback Linearization Control of 3-Phase/Level NPC Voltage-Source Rectifier

Modified Unipolar Carrier-Based PWM Strategy for Three-Level Neutral-Point-Clamped Voltage Source Inverters

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