Power grid alternating voltage, and method and device for detecting zero crossing point of power grid alternating voltage
A technology of AC voltage and detection method, which is applied in the field of solar photovoltaic technology, can solve the problems such as the influence of the accuracy of AC grid voltage detection, and achieve the effect of ensuring the detection accuracy.
Inactive Publication Date: 2012-05-30
ALTENERGY POWER SYST
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It can be seen that if the number of sampling points is limited, the accuracy of AC grid voltage zero-crossing detection will also be affected
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[0032] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.
[0033] image 3 It is a flowchart of a method for detecting a grid AC voltage zero crossing according to an embodiment of the present invention. As shown, the detection method can include:
[0034] Execute step S101 to sample the grid AC voltage;
[0035] Figure 4 It is a schematic diagram of the sampling waveform of the grid AC voltage according to an embodiment of the present invention. As shown in the figure, it shows that 200 points are sampled in one cycle.
[0036] Execute step S102 to perform analog-to-digital conversion on the sampled data;
[0037] Execute step S103 to determine whether the grid AC voltage is near the zero-crossing point, for example, determine whether the absolute value of the grid AC voltage is less than the threshold value, if yes, di...
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The invention provides a method for detecting a zero crossing point of a power grid alternating voltage. The method comprises the following steps of: sampling the power grid alternating voltage; performing analog-to-digital conversion on the sampled data; judging whether the power grid alternating voltage is positioned near the zero crossing point or not; performing multipoint sampling on the power grid alternating voltage near the zero crossing point and taking the average value; and summarizing the power grid alternating voltage data to acquire the zero crossing point of the power grid alternating voltage. The invention also provides a method for detecting the power grid alternating voltage, the power grid alternating voltage and a device for detecting the zero crossing point of the power grid alternating voltage. According to the invention, the number of the sampling points on other sections of the wave form is reduced by guaranteeing the number of the sampling points near the zero crossing point of the power grid alternating voltage wave form; and the detection precision of the zero crossing point of the power grid alternating voltage is guaranteed under the condition that the total number of the sampling points is limited or at the same data transmission speed.
Description
technical field [0001] The invention relates to the field of solar photovoltaic technology. Specifically, the invention relates to a detection method and a detection device for a grid AC voltage zero crossing, and a detection method and a detection device for a grid AC voltage. Background technique [0002] Solar photovoltaic modules convert sunlight into DC electricity. In order to input the generated electricity into the grid for users to use, it is necessary to use a solar photovoltaic grid-connected inverter to convert the DC power output by the photovoltaic modules into AC power. When connected to the grid, the output AC phase must be synchronized with the AC voltage phase of the grid. [0003] In order to achieve this goal, it is necessary to detect the zero-crossing point of the AC voltage of the grid, which is used to ensure that the phase of the AC voltage is synchronized with the phase of the AC voltage of the grid. Therefore, the accurate detection of the zero-cr...
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Inventor 罗宇浩
Owner ALTENERGY POWER SYST