fyp poster (final)
TRANSCRIPT
System Integration of Grid-Connected Photovoltaic Converters
• Unreliable grid experiences sag, swell, frequency deviation, harmonic distortion => Unreliable Performance of sensitive loads
• Reactive loads require power factor correction circuits => Additional Cost
• Harmonic-inducing loads contaminate grid current => Inefficiency
S
MainDSP
DSP
CommunicationNetwork
Sensor Network
Boost converter
Boost converter
DC/AC InverterSeries
DC/AC Inverter Parallel
Boost converter
Boost converter
DC/AC InverterSeries
PV
PV
Grid
DC/AC Inverter Parallel
Load
DSP
DSP DSP
• Phase locked loop will be embedded in the series invertor• Synchronize input grid signal with generated signal• Compensating voltage changes by tracking the grid voltage in
relation to the signal of the grid
• Measure and provide real time power measurements to the DSPs
• Use LEM Voltage Transducer to step down the voltage to +/- 1.5V
• External +/- 15V DC source to shift up the voltage to 0V ~3V.
1
3
2 • Transmit different current and voltage values from different boards to main controller
• Explore more effective communication protocol to use for the project.
Compensates for grid voltage disturbances
Series invertor
Parallel invertor
Compensates for load
harmonic and reactive currents
Current Problem
Proposed Solution
FYP Group:EEE-14A100 Students: Luo Jin Wei, Wivaldy Lee Wen Yi, Stephanie Kek Sok HuiDiploma in Clean Energy Engineering (DCEG) Supervisor: Dr Chia Chew Lin Co-supervisor: Arun Nagendra, Naga Brahmendra
*PLL is implemented inside the series inverter
Our Objectives• To design and build the sensing network will provide the accurate, precise real
time power measurement
• To build and develop a communication system which will transmit real time power measurements between multiple DSPs for Inverter control coordination
• To develop control algorithm that will compensate any grid voltage fluctuations via tracking of grid and inverters' voltage and phase.
S
S
S S S S S
*S => Sensor
1
2
3
Methodology
Reference: “Single-Phase Inverter-Control Techniques for Interfacing Renewable Energy Sources With Microgrid-Part II: Series-connected Inverter Topology to Mitigate Voltage-Related Problems Along With Active Power Flow Control,” IEEE Trans. Power Electron., Vol. 26, No. 3 , MARCH 2011