Method for quickly obtaining dynamic equivalence parameters of power collection network of wind power plant
A technology of dynamic equivalent and acquisition method, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., and can solve the problems of transient process error and low precision
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specific Embodiment approach 1
[0040] Specific embodiment one: reference Figure 1 to Figure 6 To describe this embodiment in detail, the method for quickly obtaining the dynamic equivalent parameters of the wind farm collection network described in this embodiment includes the following steps:
[0041] Step 1: Build a simulation model of a wind farm with a complete collection network. The schematic diagram of the internal structure of the wind farm is as follows figure 2 As shown, the position of each clustered wind turbine is determined according to the wind speed data and clustering indicators in the wind farm. After the grouping is completed, the schematic diagram of the internal structure of the equivalent wind farm is as follows image 3 As shown, then use the formula:
[0042]
[0043] Obtain the equivalent impedance Z of the collector network corresponding to the equivalent machine aggregated by the k-th group of wind turbines at time t eq_k , K is a positive integer.
[0044] Where Is the voltage at the ...
Embodiment
[0063] A method for quickly obtaining dynamic equivalent parameters of a wind farm collection network, the method includes the following steps:
[0064] Step 1. Build a simulation model of a wind farm with a complete collection network with 3 rows and 6 columns, such as Figure 4 Shown. Wherein, reference numeral 1 represents the power grid, reference numeral 2 represents the first 15km transmission line, reference numeral 3 represents the 30km transmission line, reference numeral 4 represents the second 15km transmission line, and reference numeral 5 represents the 110 / 35KV capacity It is a 300MVA transformer, the reference numeral 6 represents a faulty module, the reference numeral 7 represents a measurement module, and the reference numeral 8 represents a wind farm with 3 rows and 6 columns.
[0065] After passing through the generator-side step-up transformer and the collection network, the wind turbine is connected to the equivalent grid via the wind farm transformer and trans...
specific Embodiment approach 2
[0097] Embodiment 2: This embodiment further explains the method for quickly obtaining the dynamic equivalent parameters of the wind farm collection network described in Embodiment 1. In this embodiment, the start of the equivalent impedance of the kth equivalent machine Voltage The calculation formula is:
[0098]
[0099] Where, S i,j (t) is the complex power of the i-th and j-th row wind turbines after passing through the machine-end step-up transformer, S i,j The real part of (t) is the active power P i,j (t), S i,j The imaginary part of (t) is the reactive power Q i,j (t), Is the sum of the complex power of the k-th group of wind turbines after passing the machine-end step-up transformer, It is the total current injected into the corresponding cables or overhead lines of the k-th group of wind turbines.
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