Quantitative analysis method for line harmonic loss in power grid line loss evaluation
A technology for harmonic loss and quantitative analysis, which is applied in the measurement of electrical variables, harmonic reduction devices, spectrum analysis/Fourier analysis, etc. degree of effect
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specific Embodiment approach 1
[0012] Embodiment 1: Combining figure 1 Illustrating this embodiment, a method for quantitative analysis of line harmonic losses in power grid line loss assessment described in this embodiment is characterized in that the quantitative analysis method is implemented through the following steps:
[0013] Step 1. Determine the skin effect coefficient of the grid line to be quantified;
[0014] Step 2: Determine the iron loss coefficient of the grid line to be quantified;
[0015] Step 3: Combine the skin effect coefficient determined in step 1 and the iron loss coefficient determined in step 2 to establish an AC / DC resistance ratio model; input the basic parameters of the power grid line to be quantified to the AC / DC resistance ratio model, and output the harmonic impedance of each order value;
[0016] Step 4. Establish a calculation model of line harmonic loss;
[0017] Step 5: Input the harmonic impedance values of each order output in step 3 into the line harmonic loss c...
specific Embodiment approach 2
[0018] Embodiment 2: This embodiment further defines the method for quantifying line harmonic loss in the power grid line loss assessment described in Embodiment 1. In this embodiment, in step 1, the set of power grid lines to be quantified is determined. The specific method of skin effect coefficient is:
[0019] Determined by the calculation formula of the skin effect coefficient; the calculation formula of the skin effect coefficient is:
[0020] k 1 =0.99609+0.018578x-0.030263x 2 +0.020735x 3 (1)
[0021] where k 1 is the skin effect coefficient; x is the skin effect coefficient constant;
[0022] When the grid line to be quantified is a single stranded wire:
[0023]
[0024] Among them, f is the natural frequency of the grid line to be quantified; R DC is the DC resistance of the grid line to be quantified;
[0025] When the grid line to be quantified is a stranded wire and a steel wire composite stranded wire:
[0026]
[0027] Among them, D 1 is the ou...
specific Embodiment approach 3
[0029] Embodiment 3: This embodiment further defines the method for quantifying line harmonic loss in the power grid line loss assessment described in Embodiment 2. In this embodiment, in step 2 The specific method of loss coefficient is:
[0030] Determined by the calculation formula of the iron loss coefficient; the calculation formula of the iron loss coefficient is:
[0031] k 2 =0.99947+0.028859y-0.0059348y 2 +0.00042259y 3 (4)
[0032] where k 2 is the iron loss coefficient; y is the iron loss coefficient constant;
[0033] When the grid line to be quantified is a single stranded wire or a composite stranded wire with an even number of aluminum wire layers: k 2 =1;
[0034] When the grid line to be quantified is a composite stranded wire with an odd number of aluminum wire layers:
[0035]
[0036] Among them, I is the current of the grid line to be quantified, and A is the cross-sectional area of the grid line to be quantified.
[0037] In this embodiment...
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