Modeling of Gird Connected Solar, Wind and Fuel Cell Distributed Generation Units and Power Flow Controlling System for Interfacing
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Date
2018-03
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
AAU
Abstract
The popularity of distributed generation system is growing faster in the last few years
because of their higher operating efficiency and low emission levels. Distributed generators make
use of several micro-sources for their operation like photovoltaic cells, wind generator and fuel
cells. All the power generated by each is connected to a micro-grid for DG application. The microgrid
must
use
an
electric
inverter
for
power
conditioning
and
interfacing
with
the
power
system.
Basically,
the
micro-grid
inverter
has
two
operation
modes:
Standalone
mode
and
Grid-connected
mode.
In this thesis, the modeling of hybrid PV-Wind-FC distributed generation systems are done.
Dynamic models for the major system components, namely, wind, PV and fuel cell system modes
are developed by using HOMER tool. The simulation and optimization is done based on climatic
data sources and economics of the power components in which the Net Present Cost (NPC) has to
be minimized to have economically feasible system. Moreover, other parameters like capacity
shortage, renewable fraction, excess electricity and Cost of Energy (COE) are also considered to
check the technical capability so as to select the best system. HOMER simulation result displays
the most economical feasible system sorted by NPC from top to down, the prime system ranked
first has renewable fraction of 15 unit wind turbines with 100kW each rating power, 1000kW
photovoltaic panel, 500kW fuel cell and 500kW converter are part of the system to fulfill the
required 1.3832MW estimated load demand.
Then, a simulation model for the proposed hybrid power system is developed by using
Matlab/Simulink environment. This is done by creating a subsystem and masked block sets of
the major dynamic component models and then cascading in to a single aggregate model.
The final tasks are control system design and analysis of inverter interfaced micro-grid distributed
generations with existing utility- grid system. The analysis of controller is done using the Matlab
M-file. For both operation modes, a multi-loop controller is used. The voltage differential
feedback inner loop is embedded in the outer voltage loop also an output voltage decoupling and
current decoupling are implemented by using the output voltage feedback. The proposed control
scheme possess very fast dynamic response at load step change and can also achieve good steady
state performance at both linear and nonlinear loads.
Description
Keywords
Distributed Generation, Standalone Operation Mode, Girds Connected Operation Mode, Micro-Gird System, Inverter Interfaced System, Cost Optimization