论文信息 - Combined operation of DC isolated distribution and PV systems for supplying unbalanced AC loads

Combined operation of DC isolated distribution and PV systems for supplying unbalanced AC loads

This paper describes a DC isolated network which is fed by distributed generation (DG) from photovoltaic (PV) renewable sources to supply unbalanced AC loads. The battery energy storage bank has been connected to the DC network via DC/DC converter called storage converter to control the network voltage and optimize the operation of the PV generation units. The PV units are connected to the DC network via its own DC/DC converter called PV converter to ensure the required power flow. The unbalanced AC loads are connected to the DC network via its own DC/AC converter called load converter without transformer. This paper proposes a novel control strategy for storage converter which has a DC voltage droop regulator. Also a novel control system based on Clarke and Park rotating frame has been proposed for load converters. In this paper, the proposed operation method is demonstrated by simulation of power transfer between PV units, unbalanced AC loads and battery units. The simulation results based on PSCAD/EMTDC software show that DC isolated distribution system including PV units can provide the balanced voltages to supply unbalanced AC loads.

[1] Ionel Vechiu,et al. Control of four leg inverter for hybrid power system applications with unbalanced load , 2007 .

[2] Toshifumi Ise,et al. The concept of distribution flexible network PV system , 2006 .

[3] Chih-Chiang Hua,et al. Study of maximum power tracking techniques and control of DC/DC converters for photovoltaic power system , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[4] Kostas Kalaitzakis,et al. Development of a microcontroller-based, photovoltaic maximum power point tracking control system , 2001 .

[5] Rafael Mihalic,et al. Distributed generation from renewable sources in an isolated DC network , 2006 .

[6] Mukund Patel,et al. Wind and Solar Power Systems , 1999 .

[7] P. Karlsson,et al. DC bus voltage control for a distributed power system , 2003 .

[8] J. A. Gow,et al. Development of a photovoltaic array model for use in power-electronics simulation studies , 1999 .

[9] G.B. Gharehpetian,et al. A Suitable Control Strategy for Source Converters and a Novel Load- Generation Voltage Control Scheme for DC Voltage Determination in DC Distribution Systems , 2006, 2006 IEEE International Power and Energy Conference.