A three‐vector‐based direct power control strategy for three‐phase voltage source PWM converters

This paper presents a new topology of the input current continuous switch boost inverter (ICCSBI) and a perturbation observation with hysteresis comparator method. Because the traditional inverter needs to join the dead time to avoid short circuit, the dead time will cause distortion of the output current. And the traditional inverter is not suitable for photovoltaic power generation because it is a buck converter. The ICCSBI structure improves the booster circuit, which refers to the Z-source inverter. It can get higher voltage than traditional inverter. Meanwhile, the ICCSBI not only retains the advantages of the Z-source inverter but also reduces the number of passive components. In addition, the hysteresis band comparator is added to the perturbation observation method to make the system better robustness at the maximum power point of the photovoltaic system. In the photovoltaic system, to ensure the output current stable, the current control method is added to the ICCSBI. Finial, the experimental results are presented to demonstrate the new topology and control method. KEYWORDS hysteresis band comparator, input current continuous switch boost inverter, maximum power point tracking (MPPT), perturbation observation method, PV system, shoot-through

Section: Three-phase Current Control Strategymentioning

confidence: 99%

A novel switching boost inverter applied to photovoltaic power generation system

Liu

Wang

Yang³

2018

“…Therefore, the quality of the switch table has a direct impact on the performance of the DPC. [14][15][16][17] In addition to the VOC and DPC methods, model predictive control (MPC) is a model-based closed-loop optimal control strategy and is preferred for its fast response. However, a large amount of calculation is consumed.…”

Section: Introductionmentioning

confidence: 99%

“…Since a current loop is not required in DPC, the appropriate voltage vector is selected only by checking the switch table so as to directly adjust the power of the system. Therefore, the quality of the switch table has a direct impact on the performance of the DPC 14–17 …”

Section: Introductionmentioning

confidence: 99%

A modified sliding‐mode controller‐based mode predictive control strategy for three‐phase rectifier

Wang

Shi

et al. 2020

Self Cite

Summary In three‐phase pulse width modulation rectifiers, proportional integral (PI) has been used in voltage outer‐loop to obtain the active current reference when using the conventional model predictive control strategy. However, the performance of the dynamic response is poor as large step and longer settling time are required on the active power under the load variation. To cope with this problem, a sliding‐mode controller can be employed to replace the PI controller. Nevertheless, the sliding‐mode variable structure control is discontinuous which leads to the chattering problem. In this work, a novel control strategy which combines a simplified model predictive control and a modified sliding‐mode control is proposed and investigated. The proposed strategy is supposed to reduce the effect of unexpected disturbances such as the DC‐link voltage step and the load variation. Simulation and experiments have been conducted for validation. The results indicate that the proposed strategy is feasible and has excellent dynamic response. Furthermore, it is easy to design and implement.

“…They employ fully controlled semiconductors such as MOSFETs or IGBTs, and they provide some benefits such as unity power factor, bidirectional power flow, low input current harmonic, the direct power, voltage and current control ability, and the voltage boost capability, high efficiency, excellent dynamic response, and robustness. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] The common goals of these control methods are achieving unity power factor operation, sinusoidal input current shape, reducing input current harmonics, and output voltage regulation. In recent years, multilevel converters attract more interests from industry and research.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a simple predictive power controller for a 1.0‐kV single‐phase NPC PWM rectifier

Eshkevari

Mosallanejad

Sepasian

2018

This paper proposes a 1-kV single-phase neutral point clamped (NPC) PWM rectifier with a simple predictive power controller (PPC). It includes the three-level NPC converter and a simplified PPC. This system achieved to feature multi-level converters and the ability to provide high voltage gain, and a control with accurate and straightforward predictive strategy without the need of PLL and PI controller. It also takes advantages of a digital delay compensator unit, a user-friendly single-phase three-level space vector modulation (SVM) with neutral point balancing, and bidirectional active and reactive power flow. The proposed rectifier provides low input current harmonic distortion (THD < 2%), input sinusoidal current waveforms, zero or desired reactive power flow, fast dynamic response (=5 cycles), high stability, high efficiency, and the lower DC voltage ripple (<6%). Simulations have been carried out for a 1 kV/20 kW rectifier under different conditions. In this analysis, various practical conditions have been investigated and discussed in details. Furthermore, the proposed system was compared with the other literature and conventional methods.KEYWORDS direct power control, high voltage gain active rectifier, predictive power controller, single-phase PWM rectifier