A Subsynchronous Resonance Traceability Method Based on Synchrophasor Measurement Data
A technology of synchronized phasor measurement and subsynchronous resonance, which is applied in the field of power systems, can solve problems such as difficulty in obtaining accurate data and difficult application of fan models, and achieve the goal of reducing detection costs, simple and efficient traceability of subsynchronous resonance, and improving accuracy Effect
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Embodiment 1
[0101] like figure 2 As shown, a subsynchronous resonance traceability method based on synchrophasor measurement data includes the following steps:
[0102] S1. The wind power system to be detected uses the synchrophasor measurement data in its wide-area monitoring system to establish a synchrophasor mathematical model under subsynchronous resonance;
[0103] S2. Analyzing the synchrophasor mathematical model, and calculating the modes and mode coefficients therein;
[0104] S3. Calculate the modal parameters of the subsynchronous resonance based on the mode and the modal coefficient, and determine whether the currently detected wind power system is a source of the subsynchronous resonance, so as to trace the source of the subsynchronous resonance.
[0105] In this embodiment, the synchronized phasor is used as the input. Firstly, the detection problem of the SSR resonance source is clearly shown. We have explained that the synchronized phasor under the subsynchronous resona...
Embodiment 2
[0182] Utilize the method of the present invention to carry out the verification of composite signal:
[0183] The composite signal is as follows:
[0184]
[0185]
[0186] The corresponding parameters are shown in Table 1:
[0187] Table 1: Synthetic signal parameters
[0188]
[0189] image 3is the amplitude of the corresponding synchronized phasor, and white noise with a signal-to-noise ratio of 45 dB and a Gaussian distribution is added to approximate the noise with PMU in the actual situation; the synthetic signal is analyzed with the Prony algorithm and the MPM algorithm, and the fitting degree The coefficient of determination R can be used 2 To judge, if its fitness is high, then R 2 should be close to 1, so a threshold can be set to filter out poor analysis results, and the coefficient of determination is defined as follows:
[0190]
[0191] in:
[0192]
[0193]
[0194] In this example, the determination coefficient threshold is set to 0.9,...
Embodiment 3
[0198] Utilize the inventive method to carry out electromagnetic transient state (EMT) simulation verification:
[0199] The present embodiment further verifies the validity of the method of the present invention by EMT emulation, Figure 5 It is a double-fed fan wind farm built on PSCAD / EMTDC, and the wind speed is 8m / s.
[0200] When the degree of series compensation is increased from 20% to 25%, sub-synchronous resonance events occur. The resonance amplitude increases for 1 second and becomes stable due to the saturation limit of the controller, Image 6 is the A-phase waveform recorded at the PCC of No. 1 wind farm, Figure 7 is the corresponding synchrophasor.
[0201] Prony and MPM analyzes were performed on the synchronized phasors in 3s-4s. Table 3 shows the calculated subsynchronous resonance impedance. From the calculation results, it can be judged that No. 1 and No. 3 wind farms are resonance sources, which is consistent with the actual situation.
[0202] Table...
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