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Nonlinear-load electric energy measuring method

A non-linear load and electric energy measurement technology, applied in the measurement of electric variables, electric power measurement through current/voltage, measurement devices, etc., can solve the problems of large measurement errors of electric meters and algorithm calculation errors.

Active Publication Date: 2010-12-15
WASION GROUP HLDG
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Problems solved by technology

However, when the input signal is no longer a standard sinusoidal signal, which destroys this symmetry, the calculation error of the algorithm will follow. This kind of asymmetrical non-standard sinusoidal input signal is very common in nonlinear load measurement, resulting in Existing electric meter measurement error is large

Method used

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  • Nonlinear-load electric energy measuring method

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Experimental program
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Effect test

Embodiment approach 1

[0040] Implementation mode 1: This is an example with 3 levels of accuracy measurement level, see figure 2 .

[0041] In one cycle of the input signal ( )Sampling a number of points ( ), divide the signal time in the cycle into equal parts Intervals , According to the current instantaneous voltage and instantaneous current, calculate the current instantaneous power [ ] Or can be abbreviated as , Using the Simpson integral algorithm for every 2 equal partitions The active power is calculated as the following formula:

[0042] (1)

[0043] In the formula, since the complex integral formula is a single interval integral formula that uses the integral sum of two adjacent sectors to replace the original dot product algorithm, for the convenience of expression, the index of the original integral formula is used Different indicators To indicate that each calculation interval starts with an even index. At the same time, please pay attention to the difference between the a...

Embodiment approach 2

[0060] Implementation mode 2: This is an example with 5-level accuracy measurement level, see image 3 .

[0061] In one cycle of the input signal ( )Sampling a number of points ( ), divide the signal time in the cycle into equal parts Intervals , According to the current instantaneous voltage and instantaneous current, calculate the current instantaneous power [ ], Using the fourth-order Newton-Cortez integral formula for every 4 Wait for the partition The active power is calculated as the following formula:

[0062] (11)

[0063] Similarly, pay attention to the above index And the aforementioned indicators The relationship between and the difference that the formula coefficient is 4 times the theoretical calculation formula coefficient. Then, by adding up the integral value of the above formula in each equal interval, we can get:

[0064] (12)

[0065] :Current cycle energy measurement value

[0066] , Is the current voltage Current Instantaneous power value

...

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Abstract

The invention discloses a nonlinear-load measuring method having a high integral algebraic accuracy grade. Aiming at the traditional dot product measuring algorithm, the invention points out the algorithm accuracy deficiency under the condition of calculating nonlinear loads based on the analysis of algorithm characteristics, thereby providing a scheme to improve the accuracy and the adaptability of an electric energy meter on the modern nonlinear-load electric energy measurement by using a complex Newton-Cotes integral algorithm having a high-order measuring algebraic accuracy grade. Based on the theoretical analysis of the algorithm and the real-time operation characteristics of the current measuring system, the invention designs and provides a method for the real-time operation of the algorithm. Simulation and experiment results prove that the invention can effectively improve the accuracy of an electric meter in the electric energy measuring field, thereby improving the adaptability of the electric meter on wider nonlinear-load measurement.

Description

Technical field [0001] The invention belongs to the field of electric energy metering in electric power systems. Background technique [0002] Electric energy measurement is the basic basis for economic settlement between power generation companies, power transmission and transformation companies, and power customers, and its accuracy directly affects the interests of the three. In the rapid development of modern industry, the power system is connected to a large number of nonlinear loads. The resulting large number of harmonic currents and harmonic voltages not only seriously affect the power transmission efficiency, but also seriously affect the accuracy of electric energy measurement. influences. [0003] In order to effectively solve the influence of power grid harmonics on the accuracy of electric energy measurement, various experts and scholars have launched the research on non-linear load electric energy measurement. At present, the industry generally solves the problems o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R22/00G01R21/06
Inventor 易龙强宋慧娜陈金玲罗孝龙
Owner WASION GROUP HLDG