Low-voltage current limit and PI control unit coordination optimization method for high-voltage direct-current transmission
A technology of high-voltage direct current transmission and low-voltage current limiting, which is applied in the direction of AC network circuits, circuit devices, and power transmission AC networks, and can solve the problems of slow recovery of reactive power demand of converters and slow recovery of active power
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[0051] like figure 1 As shown, select PSCAD / EMTDC as the electromagnetic transient time domain simulation platform, according to the steps 1) to 4) of the present invention, a ±800KV UHV DC control system, rated DC voltage ±800KV, rated DC transmission capacity 5GM, The rated DC current is 3.125KA; the total length of the 1373km conductor is LGJQ-300; the capacity of the converter transformer at the receiving end is 732.MW, and the transformation ratio is 525 / 165.59; the capacity of the converter at the sending end is 750MW, and the transformation ratio is 525KV / 169.85. α=17°. For low voltage current limiting U DH , U DL and I DL Three parameters and PI control link K P,ref , T N,ref , two parameters are optimized, and the assumption ω p = ω q =0.5, penalty coefficient M pen = 1.0. The obtained seven parameters before and after optimization and the corresponding objective function values are shown in Table 1.
[0052]
U DH
U DL
I DL
K P,r...
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