A Coordinated Control Method of AC and DC for Improving System Stability
A technology for AC-DC coordination and system stability, which is applied in the directions of reducing flickering of AC networks, reducing/preventing power oscillation, etc., can solve the problems of observability and feedback signal limitations, limited effects, etc. The effect of stabilizing the level, suppressing the swing of the power angle, and reducing the cutting amount
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[0021] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings of the description.
[0022] The AC-DC coordinated control method for improving system stability disclosed by the present invention, its flow chart is as attached figure 1 As shown, it specifically includes the following steps: (1) When an AC fault occurs in the power grid at the sending end, start the AC-DC coordinated control.
[0023] (2) Perform low-pass filtering and direct blocking processing on the tie line power.
[0024] (3) In step (2), the curve is fitted using a quadratic polynomial. fit a curve to y=ax 2 The quadratic polynomial of +bx+c, specific steps: all data points will not fall on the fitting curve, if the kth point falls on the fitting curve, then the coordinates of the kth point satisfy the quadratic curve equation, that is :
[0025] the y k =ax k 2 +bx k +c
[0026] Among them, a, b, c are undetermined co...
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