Page 58 - Renewable Energy Devices and System with Simulations in MATLAB and ANSYS

Overview of Single-Phase Grid-Connected Photovoltaic Systems 45

3 phase
AC
DC 30 kW~
PV strings Central inverter

(e)
DC bus

DC 1 or 3 phase
Multiple PV strings DC DC DC AC inverter 10– 30 kW
DC

Multi-string
(d)
parallel (dashed)
1 or 3 phase
Series (dash-dotted)/
PV string DC AC inverter 1– 10 kW Grid-connected PV system concepts for: (a) small systems/residential, (b) small systems/residential, (c) residential, (d) commercial/residential, and

String
(c)

DC bus Series (solid)/parallel (dashed) DC AC

DC DC DC 1 or 3 phase ~Several kilowatts
DC-module converter
DC DC DC

(b)

converter
PV panel DC DC DC-module DC AC 1 phase

PV panel DC AC ~Hundreds Watts

inverter
(a) (e) commercial/utility-scale PV applications.
AC-module
AC bus Power rating FIGURE 3.3