Adaptive Feedback Linearization Based Control of a Three-Phase Grid Connected Inverter under Non-Ideal Grid Voltage Condition

2019 ◽  
Author(s):  
Vikram Roy Chowdhury ◽  
Jonathan W. Kimball
Keyword(s):  
Feedback Linearization ◽  
Adaptive Feedback ◽  
Grid Voltage ◽  
Three Phase ◽  
Grid Connected Inverter

The Analysis of the Grid-Connected Phase-Locked Loop Technologies Based on the Transformation of Coordinate System

2012 ◽  
Vol 220-223 ◽  
pp. 1175-1180
Author(s):  
Guo Tao Yang ◽  
Zhi Yi Sun ◽  
Li Qun Liu
Keyword(s):  
Simulation Analysis ◽  
Phase Locked Loop ◽  
Phase Voltage ◽  
Grid Voltage ◽  
Advantages And Disadvantages ◽  
Pv Inverter ◽  
Three Phase ◽  
Failure Conditions ◽  
Grid Connected Inverter ◽  
Generating System

In order to gain the same amplitude、frequency and phase between the output voltage of the inverter and the grid voltage, the phase-locked loop (PLL) technology is widely used in grid-connected photovoltaic (PV) generating system, which is normally used to obtain instantaneous phase information to achieve the grid-connected purpose of PV inverter. The detective accuracy of frequency and phase of the grid voltage is directly affected by the PLL. Two software PLL technologies are compared by using the simulation analysis which is based on the d-q transformation. To provide the basis for the design of grid-connected inverter, the advantages and disadvantages of two software PLL technologies are analyzed under different grid failure conditions, such as one phase voltage dropped, two of three phase voltage (TPV) dropped, grid frequency mutated, and grid voltage offset, etc. Particularly, the appropriate PLL technology can effectively improve the grid-connected ability of PV inverter under the grid voltage offset or unbalance conditions.

Modified Power Compensation Control Strategy of Three-Phase Grid-Connected Inverter under Unbalanced Grid Voltage Conditions

2015 ◽  
Vol 740 ◽  
pp. 335-338 ◽  
Author(s):  
Shao Hua Sun ◽  
Hong Qi Ben
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Positive Sequence ◽  
Grid Voltage ◽  
Compensation Control ◽  
Active And Reactive Power ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Three Phase Inverter ◽  
Unbalanced Grid

Control strategy under unbalanced grid voltage conditions is one of the most important issues for grid-connected inverter. Under unbalanced grid voltage conditions, the 2nd active and reactive power ripples generate, they pollute the grid. To meet the demands of IEEE Std.929-2000, this paper proposed a modified power compensation control strategy; the proposed solution is based on direct power control. To provide accurate compensating power, the power model of three-phase inverter under unbalanced grid voltage conditions is given, using the positive sequence current component and the negative sequence voltage component, the compensating powers are calculated in details. Theoretical analysis and comparative simulation verification are presented to demonstrate the effectiveness of the proposed control strategy.

scholarly journals Non-Cartesian Frame Transformation-Based Control of a Three-Phase Power Converter During Unbalanced Voltage Dip – Part I: Transformation Principles

2019 ◽  
Vol 4 (1) ◽  
pp. 47-61
Author(s):  
Grzegorz Iwański ◽  
Paweł Maciejewski ◽  
Tomasz Łuszczyk
Keyword(s):  
Electrical Energy ◽  
Power Converter ◽  
New Approach ◽  
Grid Voltage ◽  
Voltage Dip ◽  
Three Phase ◽  
Unbalanced Voltage ◽  
Frame Transformation ◽  
Grid Connected Inverter ◽  
Proper Operation

Abstract One of the currently investigated problems in power electronics-based electrical energy conversion is proper operation of electronic converters during grid voltage imbalance and harmonics. In classic control methods, it introduces oscillations of variables, resulting in the necessity to improve control systems with signals filtration and usually by application of resonant terms as part of current controllers. The paper presents a new approach to grid-connected inverter control based on transformation to a non-Cartesian frame, the parameters of which are correlated with grid voltage asymmetry. The proposed method results in resignation from resonant terms used as controllers and their replacement with proportional–integral terms for which anti-wind-up structures are significantly simpler than for oscillatory terms. The paper presents new transformation principles, features and some simulation results showing the waveforms of signals transformed to the new non-Cartesian frame.

Sign in / Sign up

Export Citation Format

Share Document