A method and device for locating an interharmonic source
A technology of harmonic generation and source location, applied in fault location, fault detection according to conductor type, etc., can solve the problem of unfavorable accident cause analysis and processing, inability to determine the wind farm online and real-time, affecting the safety and stability of the power grid, the safety of thermal power units, etc. , to achieve the effect of reducing the amount of calculation
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Embodiment 1
[0031] figure 1 Schematic diagram of the implementation process of the localization method for harmonic sources Figure 1 ,like figure 1 As shown, the methods for locating the source of interharmonic generation include:
[0032] Step S101: Calculate the inter-harmonic current on the connection line between the wind power collection station and the main grid, and judge whether the inter-harmonic current exceeds the threshold. The specific method is: figure 2 As shown in the case where the wind power collection station is connected to the main grid through a single line, the interharmonic current of the tie line is calculated in phases first, and the amplitudes are respectively: the harmonic current between phase A is Ijxb_A, and the harmonic current between phase B is Ijxb_B, C The inter-phase harmonic current is Ijxb_C, set the inter-harmonic current threshold value Iset, if any of the following two conditions are met, the inter-harmonic current exceeds the threshold:
[0...
Embodiment 2
[0057] image 3 Schematic diagram of the implementation process of the localization method for harmonic sources Figure II ,like image 3 As shown, the methods for locating the source of interharmonic generation include:
[0058] Step S201: Synchronously sample the current of the connecting line between the wind power collection station and the main grid, and combine the synchronously sampled currents of each phase of each branch to obtain the total current of each phase;
[0059] Specifically, such as Figure 4 The wind power collection station shown is connected to the main grid through a double-circuit line. First, the current signals of tie line 1 and tie line 2 are sampled synchronously, and combined to obtain the total current of each phase flowing from the wind power collection station to the main grid, which is used as the subsequent calculation of the inter-harmonic current the input current.
[0060] Step S202: Calculate the inter-harmonic current on the connecti...
Embodiment 3
[0085] Figure 5 It is a schematic diagram of the composition and structure of the local harmonic source location device, as shown in Figure 5As shown, the device includes a tie-line inter-harmonic current calculation module 301, a tie-line harmonic voltage calculation module 302, a tie-line inter-harmonic voltage and inter-harmonic current phase angle difference calculation module 303, a wind farm current filter module 304. Wind farm inter-harmonic current amplitude and phase angle calculation module 305 and inter-harmonic source location module 306; wherein,
[0086] The tie line interharmonic current calculation and judgment module 301 is used to calculate the interharmonic component in the current of the wind power collection station and the main network tie line, and judge whether the amplitude of the interharmonic current exceeds the set threshold, and obtain the judgment result;
[0087] The tie-line inter-harmonic voltage calculation module 302 is used to calculate t...
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