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A Single Sensor based MPPT Controller for Wind-Driven Induction
Generators Supplying DC Microgrid
Abstract
In this project, a simple method of tracking the maximum power (MP) available in the wind
energy conversion system (WECS) for dc microgrid application is proposed. A three-phase diode
bridge rectifier along with a dc-dc converter has been employed between the terminals of winddriven induction generator and dc microgrid. Induction generator is being operated in selfexcited mode with excitation capacitor at stator. The output dc grid current is considered as a
control variable to track the MP in the proposed WECS. A method has been developed for
determining the duty ratio of the dc-dc converter for operating the proposed system in MPPT
condition using wind turbine characteristics, steady-state equivalent circuit of induction
generator and power balance in power converters.
Existing method:
The existing method provides distributed generation systems reduce the energy loss and
infrastructure cost for transmission systems, since DGs are connected very close to the load
centers. In addition, renewable energy sources, such as wind and solar are extensively deployed
in distributed generation systems, which further assists for the pollution free environment. It is
known that the electrical output from DGs employing renewable energy sources is of variable
voltage dc or ac quantities. In the present day scenario majority of the loads, such as, LED
lighting, computer loads and variable speed drives demand dc as the source. So, to connect
different types of distributed generation systems, a dc bus is commonly used with suitable power
electronic controllers, which forms dc microgrid.
Proposed method:
In this method a 3-phase diode bridge rectifier (DBR) followed by a dc-dc converter
configuration has been proposed. In addition, a very simple control algorithm has been proposed
Further Details Contact: A Vinay 9030333433, 08772261612
Email: [email protected] | www.takeoffprojects.com
for MPPT, which requires the sensing of only the dc grid current. MPPT is achieved by
continuously monitoring the measured value of dc current (i.e., dc grid current) at the output of
the dc-dc converter. This has become possible by the inherent stiff dc source of the microgrid.
Hence, this algorithm does not require the information of the wind velocity and machine
parameters. Further, employing only one current sensor along with the simple power electronic
topology offers the improved reliability in wind generator systems for such dc microgrid
application.
BLOCK DIAGRAM
Circuit diagram of the proposed wind-driven SEIG for dc microgrid.
Advantages:
1. Distributed generation systems reduce the energy loss and infrastructure cost for
transmission systems.
2. Wind and solar distributed generation systems, are pollution free environment.
3. DBR at the generator terminals helps in reducing the reactive power burden on the
excitation capacitor banks.
Applications:
1. The (DBR) followed by a dc-dc converter configuration has been proposed for battery
charging application as well as supplying isolated dc load from a wind-driven SEIG.
2. Wind-driven PMA used for battery charging application with voltage and current sensing
for MPPT.
Further Details Contact: A Vinay 9030333433, 08772261612
Email: [email protected] | www.takeoffprojects.com