Method for dividing multiple harmonic source responsibilities

Abstract

The invention relates to a method for dividing multiple harmonic source responsibilities. The method includes the following steps: step S1, acquiring PCC point harmonic voltage data and harmonic source current data through measurement; step S2, intercepting the harmonic source current data and the PCC point harmonic voltage data, quantitatively expressing the correlation between PCC point harmonicvoltages and feeder line harmonic currents in each piece of data, and screening out a data segment in which fluctuation of the background harmonic voltage is smaller than a preset threshold; step 3,calculating a projection coefficient of the screened data segment, and further calculating a harmonic responsibility index. The method does not require phase information, and has simple calculation steps, engineering practicability and high popularization and application value.

Description

technical field [0001] The invention relates to the technical field of power system harmonic analysis, in particular to a multi-harmonic source responsibility division method. Background technique [0002] More and more power electronic loads are connected to the power grid, making the harmonics in the power grid more complicated, affecting the normal operation of the load, and even causing damage to power equipment or causing power outages in severe cases. In order to implement the "reward and punishment scheme" effectively, an accurate method for dividing harmonic responsibilities is needed. In an actual power system, a busbar is often connected to multiple feeders that emit harmonics. The harmonics among these users affect each other. How to calculate the harmonic responsibility index based on the existing data is an effective way to control harmonics and implement "high quality and good price" in the future. "The scheme is the premise to ensure the safe and efficient op...

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Problems solved by technology

[0005] 1. The method for screening background harmonic voltage on the system side is not very applicable

The background harmonic voltage screening method based on the optimal trajectory method can only screen the part of the background harmonic voltage with small fluctuations on the system side. However, when there is an unknown harmonic source on the user side, its fluctuation will still affect the solution of the linear equation. The method cannot filter this part of the data, which is less applicable in this case

[0006] 2. The screening method for one-to-one correlation analysis is difficult to apply to the situation of multi-harmonic sources

Background harmonic voltage screening is limited by traditional correlation analysis methods, such as Pearson correlation coefficient calculation, dynamic time rounding algorithm, etc., which can only be applied to the division of harmonic responsibilities for a single user, not for multi-user harmonic responsibility division

In the actual system, a bus is often connected to multiple harmonic source users, which makes the existing methods based on correlation analysis difficult to apply in this case

[0007] 3. It is difficult to apply the harmonic responsibility division index for the effective value in practice

Judging from the data used by the existing harmonic responsibility indicators, the PCC harmonic voltage and the harmonic current RMS data and phase data of each feeder are needed; however, the power quality monitoring system deployed by the State Grid Corporation can only provide long-term statistics value, the statistical value of phase data has no physical meaning, and the statistical value of voltage and current does not correspond, which makes the traditional method unapplicable in the existing monitoring system

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