Research on Inverter Integrated Reactive Power Control Strategy in the Grid-Connected PV Systems

In order to solve the problems caused by the susceptibility to changing weather conditions and the complex load conditions of photovoltaic (PV) systems, and the fact a single target inverter control strategy cannot effectively mitigate large voltage fluctuations at point of common coupling (PCC), an integrated reactive power control strategy for PV inverters is proposed. According to the weather and load conditions, this strategy is divided into four control modes: normal operation control mode, reverse power control mode, cloudy control mode and night control mode. The four control modes switch between each other under the specific switching rules to ensure an appropriate quantity of reactive power injection or consumption in the PV inverter. The effects of the four control modes in isolated operation were significant. The deviation rate of PCC voltage from its standard value was mitigated at about 2% under the integrated control strategy. Therefore, the proposed control strategy has a high application value in improving power quality and maximizing utilization of PV inverters.

[1]  Pradipta Kishore Dash,et al.  Adaptive threshold based new active islanding protection scheme for multiple PV based microgrid application , 2017 .

[2]  Lassaad Sbita,et al.  A Static Var Compensator controlled topology for a grid connected photovoltaic system , 2014, 2014 5th International Renewable Energy Congress (IREC).

[3]  Gerard Ledwich,et al.  DG impact on rural lines: voltage conrol and line protection issues , 2001 .

[4]  K. M. Muttaqi,et al.  A Novel Approach for Ramp-Rate Control of Solar PV Using Energy Storage to Mitigate Output Fluctuations Caused by Cloud Passing , 2014, IEEE Transactions on Energy Conversion.

[5]  Brian Seal,et al.  Smart inverter volt/var control functions for high penetration of PV on distribution systems , 2011, 2011 IEEE/PES Power Systems Conference and Exposition.

[6]  Lenin Prakash,et al.  Digital implementation of a constant frequency hysteresis controller for dual mode operation of an inverter acting as a PV-grid interface and STATCOM , 2016 .

[7]  Mahesh K. Mishra,et al.  Control of photovoltaic-based low-voltage dc microgrid system for power sharing with modified droop algorithm , 2016 .

[8]  Mahesh K. Mishra,et al.  Effective utilization of unified power quality conditioner for interconnecting PV modules with grid using power angle control method , 2013 .

[9]  D. Karlsson,et al.  Voltage and Reactive Power Control in Systems With Synchronous Machine-Based Distributed Generation , 2008, IEEE Transactions on Power Delivery.

[10]  Vinod Khadkikar,et al.  A New ${\rm P}$ - ${\rm Q}$ - ${\rm V}$ Droop Control Method for an Interline Photovoltaic (I-PV) Power System , 2013 .

[11]  R. Anita,et al.  Voltage and Frequency Control of Stand Alone Self-Excited Induction Generator Using Photovoltaic System Based STATCOM , 2016, J. Circuits Syst. Comput..

[12]  A. Yazdani,et al.  A Control Methodology and Characterization of Dynamics for a Photovoltaic (PV) System Interfaced With a Distribution Network , 2009, IEEE Transactions on Power Delivery.

[13]  K. M. Muttaqi,et al.  A Multi-Mode Control Strategy for VAr Support by Solar PV Inverters in Distribution Networks , 2015, IEEE Transactions on Power Systems.

[14]  Ryohei Kitada,et al.  Voltage Control Using PV Power Factor, Static Capacitor, and Transformer Tap for Large PV Penetration , 2016 .

[15]  Gerard Ledwich.  Distributed generation as voltage support for single wire earth return systems , 2004 .

[16]  Hao Tian,et al.  Adaptive DC-Link Voltage Control of Two-Stage Photovoltaic Inverter During Low Voltage Ride-Through Operation , 2016, IEEE Transactions on Power Electronics.

[17]  Sílvio Mariano,et al.  Impact of Rural Grid-Connected Photovoltaic Generation Systems on Power Quality , 2016 .

[18]  Masaaki Ishimaru,et al.  Positive Effect of Constant Leading Power Factor Operation of PV in Power System , 2015 .

[19]  Heverton A. Pereira,et al.  Adaptive current control strategy for harmonic compensation in single-phase solar inverters , 2017 .

[20]  Hao Chen,et al.  Inverter-Less Hybrid Voltage/Var Control for Distribution Circuits With Photovoltaic Generators , 2014, IEEE Transactions on Smart Grid.

[21]  Yang,et al.  Frequency Dividing Droop Controllers With the Function of Voltage Stabilization and Circulation Control , 2013 .

[22]  John Ward,et al.  Real and reactive power control of distributed PV inverters for overvoltage prevention and increased renewable generation hosting capacity , 2015 .

[23]  Suiyang Khoo,et al.  PV Based Microgrid with Grid-Support Grid-Forming Inverter Control-(Simulation and Analysis) , 2017 .

[24]  Piyadanai Pachanapan,et al.  Micro Static Var Compensator for Over-Voltage Control in Distribution Networks with High Penetration of Rooftop Photovoltaic Systems , 2016 .

[25]  T. Funabashi,et al.  Optimal Distribution Voltage Control and Coordination With Distributed Generation , 2008, IEEE Transactions on Power Delivery.

[26]  M.R. Iravani,et al.  Power Management Strategies for a Microgrid With Multiple Distributed Generation Units , 2006, IEEE Transactions on Power Systems.

[27]  C. L. Masters.  Voltage rise: the big issue when connecting embedded generation to long 11 kV overhead lines , 2002 .