Photovoltaic power generation voltage stabilizer

Abstract

The invention relates to a photovoltaic power generation voltage stabilizer comprising a photovoltaic system, a maximum power point tracking controller, an alternating current-direct current change-over switch, a system controller, a power grid, a controllable power current transformer, an LC low pass filter, an isolation transformer, a load, and a voltage sensor. A direct current power source output by the photovoltaic system passes the maximum power point tracking controller and then is respectively input into a direct current power source input terminal of the alternating current-direct current change-over switch and the system controller; an alternating current power source input terminal of the alternating current-direct current change-over switch is connected with the power grid; and an output terminal of the alternating current-direct current change-over switch is connected with an input terminal of the controllable power current transformer. An output terminal of the controllable power current transformer passes the LC low pass filter and then is connected with a primary winding of the isolation transformer; and a secondary winding of the isolation transformer is connected in series with the power grid and the load. And a load side is connected with the system controller by the voltage sensor; and the system sensor controls the alternating current-direct current change-over switch and the alternating current-direct current change-over switch to work. According to the invention, stability of a load voltage can be effectively guaranteed; it can be realized that power can be supplied for the load stably in long term around the clock; and the voltage stabilizer can be widely applied to a power supply system.

Description

technical field [0001] The invention relates to a voltage stabilizing device for power generation, in particular to a voltage stabilizing device for photovoltaic power generation in an electric power supply system. Background technique [0002] During the peak period of electricity consumption, the voltage of the grid is generally lower than the normal voltage, which is called undervoltage of the grid. Especially at the end of the power grid, in the suburbs of cities and some remote towns, due to the imperfect construction of the power grid or insufficient redundancy, monitoring and support, the voltage of the power grid will be 10% or lower than the normal voltage. In the case of voltage undervoltage, it may cause electrical equipment (such as household appliances) to not work normally, for example, the conversion efficiency of the electrical equipment will be very low. If the voltage undervoltage is too serious, especially if it exceeds 10%, it is very likely to damage th...

AI Technical Summary

Problems solved by technology

However, this voltage stabilization system greatly reduces the efficiency of the power supply system, usually only up to 65% efficiency

Although the power supply voltage of the load is temporarily stabilized, the efficiency of the grid to supply power to the load is reduced, resulting in more power to be obtained and consumed from the grid, thereby increasing the electricity bill; Too much power may lead to more serious undervoltage, which will have an impact on the grid and load and the opposite effect

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