Direct-current oscillation detection circuit, direct-current arc detection circuit and inverter
A detection circuit and detection controller technology, applied in the measurement of electrical variables, measurement of current/voltage, conversion of AC power input to DC power output, etc., can solve the problem of accelerating the aging of inverters and photovoltaic modules, reducing photovoltaic system power generation Damage to the internal circuit of the inverter and other problems to achieve the effect of improving the operation stability
Pending Publication Date: 2021-02-19
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
[0003]
DC oscillation will reduce the overall power generation of the photovoltaic system, and will damage the photovoltaic modules, accelerate the aging of the inverter and photovoltaic modules, severe DC oscillation will even directly damage the internal circuit of the inverter
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[0064] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0065] optional, see figure 1 , figure 1 It is a structural block diagram of a DC oscillation detection circuit provided in an embodiment of the present invention. The DC oscillation detection circuit provided in an embodiment of the present invention includes: at least one oscillation sampling circuit 10, a voltage sampling circuit 20, and an oscillation detection controller 30, wherein,
[0066] The oscillation sampling circuit 10 specifically includes a current sampling circuit 110 and ...
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The invention provides a direct-current oscillation detection circuit, a direct-current arc detection circuit and an inverter, which are applied to the technical field of power electronics; the direct-current oscillation detection circuit comprises at least one oscillation sampling circuit, a voltage sampling circuit and an oscillation detection controller; and the oscillation sampling circuit comprises a current sampling circuit and a conversion circuit which are connected in parallel. The current sampling circuit collects alternating currents on the direct current side of the inverter, and the conversion circuit converts the obtained alternating currents into sampling voltages; the voltage sampling circuit is connected with each conversion circuit and collects the sampling voltage fed back by each conversion circuit; and the oscillation detection controller performs DC oscillation detection based on the obtained sampling voltage according to a preset oscillation detection logic. According to the direct-current oscillation detection circuit provided by the invention, the alternating current of the direct current side of the photovoltaic system can be collected, so that direct current oscillation detection is carried out on the photovoltaic system, and the operation stability of the photovoltaic system is improved.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a DC oscillation detection circuit, a DC arc detection circuit and an inverter. Background technique [0002] With the large-scale application of photovoltaic power generation, the current oscillation phenomenon on the DC side of the inverter in the photovoltaic system has gradually attracted people's attention. Since the installation locations of photovoltaic modules in a photovoltaic system are relatively scattered, and the distance between each photovoltaic module and photovoltaic equipment such as inverters is relatively long, long-distance connecting cables inevitably have distributed inductance. The equivalent impedance formed by the linear parameters will lead to large or small AC currents that change periodically on the DC side of the photovoltaic system, that is, DC oscillations. [0003] DC oscillation will reduce the overall power generation of the photovolt...
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Login to View More IPC IPC(8): G01R19/165H02M7/537
CPCG01R19/16571H02M7/537Y02E10/56
Inventor 侯鹏肖靖薛丽英
Owner SUNGROW POWER SUPPLY CO LTD