A five-level photovoltaic inverter pre-charging control method and system
A photovoltaic inverter, five-level technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems that affect the reliable operation of photovoltaic grid-connected power generation systems, and five-level photovoltaic inverters cannot start normally
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Embodiment 1
[0043] refer to figure 2 Shown is a schematic flow chart of a five-level photovoltaic inverter pre-charging control method according to the present invention. In this embodiment, the method may specifically include the following steps:
[0044] Step S11: When the grid precharges the DC bus capacitor of the five-level photovoltaic inverter through the precharging circuit, detect the current voltage of the DC bus capacitor in real time.
[0045] In the practical application of photovoltaic grid-connected power generation systems, in order to prevent the impact of the grid on the photovoltaic inverter to be connected to the grid, the DC bus capacitor of the photovoltaic inverter is usually pre-charged before starting the photovoltaic inverter.
[0046] Among them, in order to grasp the changes of the grid voltage and the DC bus voltage in real time, in the practical application of this embodiment, the peak value of the grid voltage and the DC bus voltage can be detected in real ...
Embodiment 2
[0060] refer to Figure 4 The schematic flow chart of another five-level photovoltaic inverter pre-charging control method of the present invention is shown, wherein, the topology diagram of the five-level photovoltaic inverter can refer to figure 1 , this embodiment will not be described in detail here, then the control method may include the following steps:
[0061] Step S21: When the grid precharges the DC bus capacitor of the five-level photovoltaic inverter through the precharging circuit, detect the current voltage of the DC bus capacitor and the grid voltage peak value in real time.
[0062] Step S22: When the detected current voltage of the DC bus capacitor is equal to the peak value of the grid voltage, disconnect the pre-charging circuit.
[0063] Step S23: Determine whether the current voltage of the DC bus capacitor detected when the pre-charging circuit is disconnected is less than the first threshold value, if not, go to step S24, and if yes, go to step S26.
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Embodiment 3
[0070] refer to Figure 4 Shown is a schematic structural diagram of a five-level photovoltaic inverter pre-charging control system of the present invention, wherein the five-level photovoltaic inverter may include a first DC / DC circuit, a second DC / DC circuit, a DC bus Capacitor and five-level inverter unit, its specific connection structure and its connection relationship with other devices in the photovoltaic grid-connected power generation system can refer to figure 1 , this embodiment will not be repeated here, then the pre-charging control system may specifically include: a detection device 31, a first controller 32 and a second controller 33, wherein:
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Abstract
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