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Control system and method for a universal power conditioning system

Patent ·
OSTI ID:1151823
; ;
A new current loop control system method is proposed for a single-phase grid-tie power conditioning system that can be used under a standalone or a grid-tie mode. This type of inverter utilizes an inductor-capacitor-inductor (LCL) filter as the interface in between inverter and the utility grid. The first set of inductor-capacitor (LC) can be used in the standalone mode, and the complete LCL can be used for the grid-tie mode. A new admittance compensation technique is proposed for the controller design to avoid low stability margin while maintaining sufficient gain at the fundamental frequency. The proposed current loop controller system and admittance compensation technique have been simulated and tested. Simulation results indicate that without the admittance path compensation, the current loop controller output duty cycle is largely offset by an undesired admittance path. At the initial simulation cycle, the power flow may be erratically fed back to the inverter causing catastrophic failure. With admittance path compensation, the output power shows a steady-state offset that matches the design value. Experimental results show that the inverter is capable of both a standalone and a grid-tie connection mode using the LCL filter configuration.
Research Organization:
NETL (National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV (United States))
Sponsoring Organization:
USDOE
DOE Contract Number:
FC26-02NT41567
Assignee:
Virginia Tech Intellectual Properties, Inc. (Blacksburg, VA)
Patent Number(s):
8,824,174
Application Number:
12/036,087
OSTI ID:
1151823
Country of Publication:
United States
Language:
English

References (6)

Admittance Compensation in Current Loop Control for a Grid-Tie LCL Fuel Cell Inverter journal July 2008
Study On Grid Connected Inverter Used in High Power Wind Generation System conference December 2006
Low-cost digital implementation of proportional-resonant current controllers for PV inverter applications using delta operator conference January 2005
Current Loop Control with Admittance Compensation for a Single-Phase Grid-Tie Fuel Cell Power Conditioning System conference February 2007
Modeling, analysis and control of bidirectional power flow in grid connected inverter systems
  • Sivakumar, S.; Parsons, T.; Sivakumar, S. C.
  • Power Conversion Conference - Osaka PCC 2002, Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579) https://doi.org/10.1109/PCC.2002.998111
conference January 2002
Current Phase Lead Compensation in Single-Phase PFC Boost Converters With a Reduced Switching Frequency to Line Frequency Ratio journal January 2007

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