Fluctuation quantity method-based user side harmonic emission level practicality estimation method

An emission level, user-side technology, applied in spectrum analysis/Fourier analysis, etc., can solve the problem that the preconditions cannot be fully satisfied.

Inactive Publication Date: 2011-07-27
TSINGHUA UNIV
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Problems solved by technology

In practical applications, this prerequisite cannot be fully satisfied due to various complex working conditions.

Method used

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  • Fluctuation quantity method-based user side harmonic emission level practicality estimation method
  • Fluctuation quantity method-based user side harmonic emission level practicality estimation method
  • Fluctuation quantity method-based user side harmonic emission level practicality estimation method

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Embodiment Construction

[0045] The present invention implements according to following 4 stages:

[0046] 1. Phase 1: Long-term measurement of the PCC at the public connection point, by cutting off and closing the user load to be studied, and collecting the voltage at the PCC at the public connection point under the load shedding state and the non-load shedding state and current Data, calculate the coefficient of precision H value.

[0047] The physical meaning of the accuracy factor H is the proportion of the fluctuation generated by the harmonic source on the power supply side to the total fluctuation at the PCC. The smaller the specific gravity, the higher the accuracy of the estimated value of the harmonic impedance of the power supply side obtained by the fluctuation method. When H=0, that is, there is no fluctuation in the harmonic source on the power supply side, the fluctuation quantity method can theoretically estimate the harmonic impedance value on the power supply side without error. ...

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Abstract

The invention discloses a fluctuation quantity method-based user side harmonic emission level practicality estimation method, belongs to the field of power quality harmonic treatment, is used for dividing rights and liabilities of harmonic pollution on a power supply side and an electricity side and belongs to a theoretical method practicality technology. The invention provides a complete processfor estimating the user side harmonic emission level by employing a fluctuation quantity method, provides a method for quantizing deviation between a power supply side harmonic impedance amplitude estimated value and an actual value, provides power supply side harmonic impedance amplitude estimated value accuracy for engineering, and easily and quantitatively judges whether the estimated value meets the requirement on engineering accuracy. In the method, various problems which possibly exist in actual engineering are considered theoretically. The conception of the time-varying dynamic phasor-based fluctuation quantity method is stated, the conventional harmonic impedance estimated value algorithm is improved, the least squares fitting algorithm which is wider in applicability and higher in accuracy is provided to estimate power supply side harmonic impedance; therefore, a practical flow more accords with actual operating conditions of a power system.

Description

Technical field: [0001] The practical estimation method of user-side harmonic emission level based on the fluctuation quantity method belongs to the field of power quality harmonic control. It is used to divide the rights and responsibilities of harmonic pollution between the power supply side and the power consumption side, and belongs to the practical application of theoretical methods. . Background technique: [0002] In 1988, in order to strengthen the power quality management of the power system, my country promulgated and implemented the "Regulations on the Technical Supervision and Management of Power Grid Power Quality", and put forward the principle of "whoever interferes, who pollutes, who governs". The regulations quantify the degree of harmonic pollution to the power grid from the power supply side and the power consumption side, and further clarify the division of pollution rights and responsibilities. [0003] A standard for quantifying the degree of pollution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 沈沉王诗超程建洲
Owner TSINGHUA UNIV
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