The document discusses using an electric spring to address voltage fluctuations in a grid-connected photovoltaic system. It presents a Matlab/Simulink model of a photovoltaic system with an electric spring. The model shows that the electric spring can effectively stabilize the voltage on the bus by transferring voltage fluctuations to a wide-voltage load when the active power from the PV system fluctuates. The electric spring is thus an effective method to solve voltage fluctuation issues in grid-connected photovoltaic systems.

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The Application of Electric Spring in Grid-Connected
Photovoltaic System
ABSTRACT:
The characteristics of distributed photovoltaic system power generation system is intermittent
and instability. Under the weak grid conditions, when the active power of the PV system injected
into the grid is fluctuant, the voltage of supply feeder will increase or decrease, thus affecting the
normal use of sensitive load. The electric spring can transfer the energy injected into the supply
feeder to the wide-voltage load, which is in series with the ES, to ensure the voltage stability of
the sensitive load in the system. In this paper, a grid-connected photovoltaic simulation model
with electric spring is built in Matlab / simulink. The voltage waveforms on the ES and sensitive
load is obtained under the condition of changing the active power injected into the supply feeder
by the grid-connected photovoltaic system. Thought the analysis of the waveforms, we can find
that the Electric spring is a kind of effective method to solve the voltage fluctuation of the supply
feeder in the grid-connected PV system.
KEYWORDS:
1. Electric spring
2. Grid-Connected Photovoltaic System
3. Voltage Regulation
4. Photovoltaic Consumption
SOFTWARE: MATLAB/SIMULINK

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BLOCK DIAGRAM:
Figure 1. The photovoltaic system model with Electric spring
EXPECTED SIMULATION RESULTS:
Figure 5. The effective value of line voltage when the active power of PV system decreases
Figure 6. The line voltage when the active power of PV system increases (with
ES)
CONCLUSION:
This paper applies the electric spring to the PV system to solve the problem that the bus voltage
fluctuates due to the power fluctuation during the PV power injected into the bus. By building a
simulation model in Matlab /Simulink, it is proved that the voltage on the bus can be effectively
stabilized after adding the electric spring in the grid-connected photovoltaic system. When the
active power of the PV fluctuates, the electric spring can transfer the voltage fluctuation on the
bus to the wide-voltage load, in order to ensure that the bus voltage stability in the vicinity of the
given value. Therefore, this is an effective method to solve the fluctuation of the bus voltage in
PV grid connected system.
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3. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
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