Power conversion apparatus
A power conversion device and power technology, which is applied to output power conversion devices, electrical components, electrical signal transmission systems, etc., can solve the problems of lower overall efficiency of power conditioners and increased switching losses, and achieve increased potential variation and reliability. with high efficiency
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Embodiment approach 1
[0029] A power conversion device (hereinafter referred to as a power conditioner) according to Embodiment 1 of the present invention will be described below with reference to the drawings.
[0030] figure 1 is a schematic configuration diagram showing a power conditioner according to Embodiment 1 of the present invention. Such as figure 1 As shown, the AC sides of a plurality (three in this case) of single-phase inverters 2B-INV, 3B-INV, and 1B-INV are connected in series to form an inverter unit 1 as a single-phase multiple converter. Each of the single-phase inverters 2B-INV, 3B-INV, and 1B-INV is composed of self-arc-extinguishing semiconductor switching elements such as a plurality of IGBTs connected in antiparallel to diodes. 3B Connect single-phase inverter (second inverter) 1B-INV to one of the two terminals on the AC side of single-phase inverter (first inverter) 3B-INV for input, and connect single-phase inverter (second inverter) 1B-INV to the other. Phase inverte...
Embodiment approach 2
[0047] In Embodiment 1 described above, the semiconductor switches Qx, Qy for short-circuiting between the two AC-side terminals of the first inverter 3B-INV are provided, but the semiconductor switches Qx, Qy may not be provided.
[0048] In this case, the output voltage waveforms of the single-phase inverters 2B-INV, 3B-INV, and 1B-INV are the same as figure 2 As shown, the output of the second inverter 1B-INV is equal to the output of the third inverter 2B-INV, and the second and third inverters 1B-INV and 2B-INV are to complement the target output voltage and the first Inverter 3B-INV outputs the difference between output voltages. Therefore, during the period when the first inverter 3B-INV outputs positive or negative voltages, the DC power supply V of the first inverter 3B-INV 3B The midpoint X and the output voltage of the power regulator V out The intermediate potentials are equal.
[0049] And, during the period when the output voltage of the first inverter 3B-INV...
Embodiment approach 3
[0052] Next, the following shows the difference between the circuit configuration and the above-mentioned Embodiment 1. figure 1 In the same power conditioner shown in , the implementation of improved chopper circuit 3 efficiency.
[0053] The maximum output voltage required for an AC output of 200V is about 282V, and the output voltage V of the inverter unit 1 A The maximum can be output to V 1B +V 2B +V 3B . Therefore, if V 1B +V 2B +V 3B If the voltage is above about 282V, the power regulator can output 200V AC. V 1B +V 2B +V 3B than the voltage V boosted by the chopper circuit 3 3B to be large, such as V 1B , V 2B , V 3B When the relationship is 2:2:9, it becomes V 3B 13 / 9 times. That is, when V 3B is approximately 195V above when V 1B +V 2B +V 3B It is above 282V, which becomes the condition of AC output.
[0054] at solar voltage V O When it is 195V or higher, V 3B It is also about 195V or more, and a predetermined AC output can be obtained. There...
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