Abstract
As the assimilation of photovoltaic (PV) systems with grid is having an exponential growth, design of an appropriate controller gains a higher priority. The PV system output changes with solar irradiation and cell temperature, and also the power converters are variable structure devices which further assist in making the entire system as a highly nonlinear system. The control system in a two-stage PV system is achieved through two different control approaches. One is to make the PV work so as to extract maximum power from it, and the other control strategy aims at regulating the output of the converter. In order to satisfy both the control objectives simultaneously, controllers are segregated based on its work. In order to make the system continuously adapt and extract maximum power from PV, an algorithm exists known as Maximum Power Point Tracking (MPPT). The MPPT provided voltage as a reference is used which is further compared to converter output through a closed loop. The closed-loop voltage regulation of converter output is further dealt with a controller which varies the duty cycle of the power converter through the pulse width modulation (PWM) process.
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Abbreviations
- ARE :
-
Algebraic Ricatti equation
- CCM :
-
Continuous conduction mode
- DCM :
-
Discontinuous conduction mode
- FLC :
-
Fuzzy logic controller
- GM :
-
Gain margin
- IC :
-
Incremental conductance
- MPPT :
-
Maximum Power Point Tracking
- MRAS :
-
Model reference adaptive system
- MRAC :
-
Model reference adaptive control
- MPP :
-
Maximum power point
- LQG :
-
Linear quadratic Gaussian
- LQR :
-
Linear quadratic regulator
- LQE :
-
Linear quadratic estimator
- P&O :
-
Perturb and observe
- PI :
-
Proportional integral
- PID :
-
Proportional integral derivative
- PM :
-
Phase margin
- PV :
-
Photovoltaic
- PWM :
-
Pulse width modulation
- SM :
-
Sliding mode
- SMC :
-
Sliding mode control
- SC :
-
Solar cell
- SSA :
-
State-space averaging technique
- SVC :
-
Static VAR compensator
- ZN :
-
Ziegler–Nichols method
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Swain, N., Pati, N. (2020). Design of Linear and Nonlinear Controllers for a Grid-Connected PV System for Constant Voltage Applications. In: Ray, P., Biswal, M. (eds) Microgrid: Operation, Control, Monitoring and Protection. Lecture Notes in Electrical Engineering, vol 625. Springer, Singapore. https://doi.org/10.1007/978-981-15-1781-5_5
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