Relay failure detection method, device and system for photovoltaic grid-connected inverter
A detection method and detection device technology, which are applied in measurement devices, circuit breaker tests, instruments, etc., can solve problems such as increased hardware costs, waste of digital processing chip resources, and easy misjudgment of relay failures.
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[0055] see figure 2 , figure 2 A schematic structural diagram of a photovoltaic grid-connected inverter system applied to a relay failure detection method of a photovoltaic grid-connected inverter provided by an embodiment of the present invention, wherein the photovoltaic grid-connected inverter system includes bus capacitors (C1 and C2), the first capacitor CY, the inverter unit 201, the first relay S1, the second relay S2 and the filter module.
[0056] Wherein, the filter module may be an LCL filter, including an inductor L1, an inductor L2, and a capacitor Cf. The bus capacitor has a target midpoint O, and the photovoltaic grid-connected inverter system has a grid neutral point N.
[0057] The first capacitor CY can be set between the output negative electrode PV- of the photovoltaic grid-connected inverter and the ground, and can also be set at other suitable positions, such as between PV+ and the ground, and the suitable position can be based on actual conditions. ...
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