Transient response of digital peak current mode boost converter for DC bus voltage compensation

This paper presents an evaluation of an optimal DC bus voltage regulation strategy for grid-connected photovoltaic (PV) system with battery energy storage (BES). The BES is connected to the PV system DC bus using a DC/DC buck-boost converter. The converter facilitates the BES power charge/discharge to compensate for the DC bus voltage deviation during severe disturbance conditions. In this way, the regulation of DC bus voltage of the PV/BES system can be enhanced as compared to the conventional regulation that is solely based on the voltage-sourced converter (VSC). For the grid side VSC (G-VSC), two control methods, namely, the voltage-mode and current-mode controls, are applied. For control parameter optimization, the simplex optimization technique is applied for the G-VSC voltage- and current-mode controls, including the BES DC/DC buck-boost converter controllers. A new set of optimized parameters are obtained for each of the power converters for comparison purposes. The PSCAD/EMTDC-based simulation case studies are presented to evaluate the performance of the proposed optimized control scheme in comparison to the conventional methods.

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An improved droop control strategy for accurate current sharing and DC-BUS voltage compensation in DC microgrid

The 16th IET International Conference on AC and DC Power Transmission (ACDC 2020) ◽

10.1049/icp.2020.0285 ◽

2021 ◽

Author(s):

X. Tian ◽

Y. Wang ◽

F. Wang ◽

Z. Guo ◽

Y. Dong

Keyword(s):

Control Strategy ◽

Droop Control ◽

Dc Microgrid ◽

Current Sharing ◽

Voltage Compensation ◽

Dc Bus ◽

Bus Voltage

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An adaptive nonlinear droop control for accurate load current sharing and DC bus voltage compensation in a DC power system

Journal of Power Electronics ◽

10.1007/s43236-021-00350-5 ◽

2021 ◽

Author(s):

Xinna Tian ◽

Yubin Wang ◽

Fan Wang ◽

Zheng Guo

Keyword(s):

Power System ◽

Droop Control ◽

Load Current ◽

Current Sharing ◽

Dc Power ◽

Voltage Compensation ◽

Dc Bus ◽

Bus Voltage

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Dual-Mode Photovoltaic Bidirectional Inverter Operation for Seamless Power Transfer to DC and AC Loads with the Grid Interface

International Journal of Photoenergy ◽

10.1155/2019/8498435 ◽

2019 ◽

Vol 2019 ◽

pp. 1-14

Author(s):

M. Srikanth ◽

B. Pakkiraiah ◽

Poonam Upadhyay ◽

S. Tara Kalyani

Keyword(s):

Distribution System ◽

Output Voltage ◽

Power Flow ◽

Boost Converter ◽

Power Transfer ◽

Dual Mode ◽

Point Tracking ◽

Dc Bus ◽

Bus Voltage ◽

Power Point

This paper develops the photovoltaic bidirectional inverter (BI) operated in dual mode for the seamless power transfer to DC and AC loads. Normal photovoltaic (PV) output voltage is fed to boost converter, but in space application, boost converter is not so preferable. To overcome this, buck and boost converters are proposed in this paper. Duty cycle to this converter is provided with the help of the outcome of the maximum power point tracking (MPPT) controller. This can be implemented by using perturbation and observation method. The MPPT will operate the switch between buck and boost modes. When the output voltage of a PV array is close to the dc bus voltage, then the bidirectional inverter can fulfill both rectification and grid connected mode. To control the power flow between dc bus and ac grid, a dc distribution system is used to regulate the dc bus voltage to a convinced level. Moreover, the bidirectional inverter must fulfill grid connection (sell power) and rectification (buy power) with power factor correction (PFC) to control the power flow between dc bus and ac grid. The simulations and hardware experimental results of a 2.5 kVA circuit are presented to validate the performance of the proposed dual-mode seamless power transfer.

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