Power conversion device and power generation conversion system
A power conversion device and power converter technology, applied in photovoltaic power generation, wind power generation, wind turbines, etc., to achieve the effect of improving operation continuity, improving voltage utilization rate, and preventing overvoltage
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[0049] [Example 1]
[0050] This embodiment is a power conversion device that is connected to a solar power generation panel and an AC system, converts the power generated by the solar power generation panel into AC power, and outputs it to the AC system.
[0051] That is, it includes: a power converter for generating power control, which controls the generated power from the solar panel, and converts the generated power into DC power; a smoothing capacitor connected to the output terminal of the power converter for generating power control; system interconnection A power converter connected to the power converter for power generation control and the smoothing capacitor, and converts the DC power into AC power and outputs it to the AC system; and a control unit that includes the voltage amplitude of the AC system as input and According to the voltage amplitude, the generated power limiting mechanism changes the upper limit value of the generated power of the power converter for po...
Example Embodiment
[0086] [Example 2]
[0087] Next, Example 2 of the present invention will be described. Figure 7 The main circuit structure of the power conversion device of the second embodiment is shown. In this embodiment, the same reference numerals are used to denote the same elements as in the first embodiment of the present invention, and the description is omitted.
[0088] This embodiment is characterized in that the AC system 2 is a three-phase AC system, and the power generation current limiting mechanism 2003 reduces the upper limit of the current command value limiter 2005 according to the positive phase voltage amplitude of the AC system.
[0089] The power converter 11 for power generation control of the power conversion device 1 of this embodiment is the same as that of the first embodiment. In addition, similar to the first embodiment, the power converter 11 for power generation control is connected to the photovoltaic power generation panel 3, and the power converter 30 for sys...
Example Embodiment
[0103] [Example 3]
[0104] Picture 11 The structure of the main part of the power conversion device of Example 3 is shown. In this embodiment, the same reference numerals are used to denote the same elements as in the first and second embodiments, and the description is omitted.
[0105] The power converter 30 for system interconnection of the power conversion device 1 is the same as in the second embodiment. In addition, the power converter 30 for system interconnection is connected to the AC system 2 and outputs power to the AC system 2 so that the terminal voltage of the smoothing capacitor 12 follows a predetermined voltage.
[0106] The difference from the first embodiment is that in the third embodiment, the power source connected to the power converter 11 for generating power control is a DC power source 5. In addition, with respect to the power conversion device of the second embodiment, the maximum power following operation of the photovoltaic power generation panel 3 ...
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