Method for measuring phase angle of power of metering chip and application of method
A technology for measuring metering and power. It is used in the measurement of electrical variables, the phase angle between voltage and current, and the measurement device. It can solve problems such as failure to measure the phase angle.
Active Publication Date: 2015-07-01
ZHANGZHOU CANNET ELECTRICAL APPLIANCE
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Problems solved by technology
[0005] However, none of the above-mentioned patent applications can solve the technical problem of measuring the phase angle, and it is still necessary to use active and reactive power directions and functional factors to artificially calculate the phase angle
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[0035] like figure 1 As shown, in this embodiment, the processor is a single-chip microcomputer, taking the metering chip CS5463 as an example, the single-chip microcomputer reads the active power, reactive power, and power factor of the metering chip CS5463 once per second. Power is signed, take out the positive and negative sign bits of active power and reactive power, and use these two sign bits to determine which quadrant the current power falls in:
[0036] (1) If the active power is positive and the reactive power is positive, then the phase angle is in the first quadrant, and the phase angle is the same as the assumed phase angle;
[0037] (2) If the active power is negative and the reactive power is positive, then the phase angle is in the second quadrant, and the phase angle is equal to 180°-the assumed phase angle;
[0038] (3) If the active power is negative and the reactive power is negative, then the phase angle is in the third quadrant, and the phase angle is eq...
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The invention relates to a method for measuring a phase angle of power of a metering chip. The method comprises the following steps that: (1) a processor reads the active power, the reactive power and the power factor of the metering chip; (2) the processor makes calculation to obtain a radian value corresponding to the power factor; (3) assuming that symbols of the active power and the reactive power are positive, the processor makes calculation to obtain an assumed phase angle in the first quadrant, which corresponds to the active power, the reactive power and the power factor; and (4) whether the symbols of the active power and the reactive power are positive or negative are judged, if the active power is positive and the reactive power is positive, the phase angle is positioned in the first quadrant, and the phase angle is equal to the assumed phase angle; if the active power is negative and the reactive power is positive, the phase angle is positioned in the second quadrant, and the phase angle is 180 DEG - the assumed phase angle; if the active power is negative and the reactive power is negative, the phase angle is positioned in the third quadrant, and the phase angle is equal to 180 DEG + the assumed phase angle; and if the active power is positive and the reactive power is negative, the phase angle is positioned in the fourth quadrant, and the phase angle is equal to 360 DEG - the assumed phase angle.
Description
technical field [0001] The invention relates to a method for measuring phase angle, more specifically, to a method for measuring the phase angle of metering chip power, and its application. Background technique [0002] The power system monitoring terminal has the functions of real-time collection of the power grid, remote remote control, fault handling, alarm and time synchronization, etc., which is a powerful guarantee for the safe and normal operation of the power grid. As the country proposes the concept of building a strong smart grid, the measurement accuracy requirements for power system monitoring terminals are getting higher and higher. It is difficult to measure the electrical parameters of the power grid through the on-chip ADC of the microprocessor to meet the high-precision requirements. The cost of using a high-precision ADC chip is relatively high, and the energy metering chip takes into account the requirements of the terminal for accuracy and cost. When the...
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IPC IPC(8): G01R25/00
Inventor 陈宝盛朱健伟曾戈弋许来顺
Owner ZHANGZHOU CANNET ELECTRICAL APPLIANCE