ABSTRACT:
Indonesia is a tropical country that has the
privilege of gaining sunshine year-round so that the utilization of solar
energy as a solar power plant can be a potential power plant to be developed.
One of the problems in the solar power plant system is the power instability generated
by the solar panels because it relies heavily on irradiance and relatively low
energy conversion efficiency. To solve this problem, the Maximum control of
Power Point Tracking (MPPT) is required by the Perturb and Observe (P&O)
methods. This P&O MPPT control makes solar PV operate at the MPP point so that
the solar PV output power is maximized. However, the MPPT P&O control that
works at the MPP point makes the output voltage to the load is also maximum
that causes overvoltage. This paper, therefore, discusses the modification of
the MPPT Perturb and Observe (P&O) algorithm for Constant Power Generation
(CPG) that combines MPPT P&O with the power control settings to the maximum
limit of solar PV. This method can set up 2 operating conditions of the solar
PV namely MPPT mode and CPG mode. The MPPT mode works when the solar PV output
power is smaller than the reference power to maximize solar PV output power.
However when the solar PV output power is more than or equal to the reference power
then the CPG mode works to limit the solar panel's output power. Based on the
simulated results of this MPPT-CPG control shows the load output voltage response can be kept constant 48 V with less
than 5% error that has been verified using a variety of irradiance and reference
power.
KEYWORDS:
1.
Constant power generation (CPG)
2.
Maximum power point tracking (MPPT) P&O
3.
Solar PV
SOFTWARE:
MATLAB/SIMULINK
CONCLUSION:
In
this paper, we propose the MPPT P&O-CPG method to be able to control solar
panels that work on 2 conditions i.e. in MPPT operations and CPG operations to
avoid overvoltage on the load. This MPPT P&O-CPG method has been evaluated through
a PSIM simulation. Simulated results indicate that the MPPT mode is identified
when the load requirements are greater or equal to the solar power panel (PPV
< = Pref) and the voltage on the output side of the < 48V. While CPG mode
is identified when the power requirements of the solar panel are greater than
the load power (PPV > Pref) and the voltage at > 48V output. The
performance of the MPPT P&O-CPG method is proven to avoid excess voltage
with a control error limit of ± 5% of the rating voltage on the load although
it is still overshot during mode switching due to irradiance fluctuations.
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