Control Strategy Schematic (compensating for harmonic current)
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as the picture shows. The power supply current is closed-loop controlled, and the reference current and the actual current pass through the current controller and output the inverter voltage reference value. Then, the switching signal of the inverter is obtained by using space vector modulation (SVPWM) technology, and the hybrid APF is controlled to perform harmonic compensation. The DC bus voltage control is achieved by adjusting the reactive current. The error between the DC bus voltage and the reference signal is generated by the PI controller, and then dq is inversely transformed. Finally, the voltage regulation signal is added to the current reference signal. If only the harmonic current is compensated, the phase φ(t) of the current reference can be directly obtained by sliding Fourier transform of the load current; if the harmonic and reactive current are simultaneously compensated, φ(t) can perform sliding Fourier analysis on the grid phase voltage. get.
Hybrid APF circuit diagram (compensating for harmonic current)
The hybrid APF circuit structure used as a compensation current harmonic is shown in the figure. Among them, the hybrid APF and the non-linear load (diode rectifier bridge resistor and inductive load) are connected in parallel to the grid, and a harmonic current with equal amplitude and opposite phase is generated by the switching action of the IGBT, and the harmonic current generated by the nonlinear load is generated. Offset.
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Main effect:
Energy storage: Solar Battery Pack is used to store electricity generated by solar power, and store excess electricity to supply electricity when solar energy is unavailable or power demand exceeds solar energy generation.
Regulating power fluctuations: The output of solar panels is affected by factors such as solar radiation, causing fluctuations in power. The Solar Battery Pack smooths out power fluctuations and maintains steady power output.
Improve self-sufficiency: By storing solar power, Solar Battery Pack can increase the self-sufficiency of the solar system, that is, it can meet the power needs of electrical equipment and reduce dependence on the grid.
Differences from Solar Energy Storage System:
The Solar Battery Pack is an integral part of the Solar Energy Storage System. Solar Energy Storage System is a broader concept that includes all systems used to store solar energy or other energy, of which the Solar Battery Pack is a component.
The Solar Energy Storage System also includes other components such as inverters, charge, and discharge controllers, battery management systems, etc., which together form a complete energy storage system. The Solar Battery Pack is mainly responsible for the function of storing electrical energy. Therefore, Solar Energy Storage System covers more components and functions, and Solar Battery Pack is only one component of it.
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