Power meter with duration measurement function and power measurement system
A technology of duration and power measurement, applied in the direction of measuring electrical variables, electrical power measurement by applying digital technology, measuring devices, etc., which can solve the problems of oscilloscope difficulties, increase the error range of the test system, and poor equipment utilization.
Active Publication Date: 2016-02-10
致茂电子(苏州)有限公司
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Problems solved by technology
[0005] The runontime test method of the above-mentioned prior art is carried out by using an oscilloscope or a digital recorder, etc. However, the oscilloscope is only used for this test in the system, so its equipment utilization rate is extremely poor
On the other hand, it is usually set at 1% of the original current for judging the time point when the solar inverter stops outputting, and it is extremely difficult for an oscilloscope to achieve an error level of less than 1%.
What's more, because the oscilloscope itself cannot directly calculate the duration, but must use the measured current waveform to be calculated by humans or other calculation software, which will further increase the error range of the test system
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[0039] See figure 2 , figure 2 It is a schematic diagram of a power measurement system 2 according to a specific embodiment of the present invention. Such as figure 2 As shown, the power measurement system 2 includes a control device 20 and a power meter 22. The power meter 22 is electrically connected between the solar inverter P and the mains terminal M, and can be used to measure the output of the solar inverter P to the mains. Power of terminal M. Please note that the solar inverter P here is a grid-connected solar inverter, which can be connected in parallel with the mains system (mains terminal M) to convert the direct current generated by the solar cell into alternating current and feed it into the mains system.
[0040] In this embodiment, the control device 20 is connected to the power meter 22 to receive the current and voltage signals measured by the power meter 22. The control device 20 is simultaneously connected to the switch S2 connected to the solar inverter P...
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The invention discloses a power meter and a power measurement system with a function of measuring duration time, and measurement of duration time of a photovoltaic inverter is realized. The power meter comprises a current meter and a processor. The current meter can be used for measuring a current signal outputted by the photovoltaic inverter. The processor is electrically connected with the current meter. The processor comprises a comparison unit and a timing unit. When the photovoltaic inverter closes output according to a triggering signal, the current signal measured by the current meter can be compared with a preset signal by the comparison unit, and a stop signal is sent when the current signal is less than the preset signal. The timing unit can acquire duration time of the photovoltaic inverter according to the triggering signal and the stop signal.
Description
Technical field [0001] The present invention relates to a power meter and a power measurement system, and more particularly to a power meter having a function of measuring the duration of a solar inverter, and a power measurement system using the power meter. Background technique [0002] Solar power generation uses solar photovoltaic cells to receive sunlight and convert the light energy of the sunlight into electrical energy. The electric energy converted by the solar photovoltaic cell is in the form of direct current, so it needs to be converted into alternating current before it can be used by general electrical appliances. Solar inverter (PhotovoltaicInverter, PVinverter), also known as solar photovoltaic converter, can convert direct current generated by solar photovoltaic cells into alternating current, which has three forms: independent, grid-connected and hybrid. The AC output generated by the independent solar inverter is stored in the battery for use in an independent...
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IPC IPC(8): G01R21/133G01R19/175
Inventor 王耀南卢志诚刘正彬
Owner 致茂电子(苏州)有限公司