Continuous commutation failure DC blocking suppression method based on sound DC emergency support
A technology for commutation failure and emergency support, applied in the direction of power transmission AC network, etc., can solve problems such as power grid frequency problems, large-scale shutdown, and economic loss during system recovery and startup
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[0056] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0057] Such as Figure 5 As shown, the present invention discloses a continuous commutation failure DC blocking suppression method based on sound DC emergency support, including the following steps:
[0058] Step 1: Solve the power angle difference steady-state value δ1 corresponding to the steady-state operating point a and the power angle difference δh corresponding to the critical stable operating point h. When the commutation failure signal is detected, record the number of commutation failures k=1, and set ΔT is the duration of a commutation failure power sag, the change process of the equivalent mechanical power and electromagnetic power caused by a commutation failure power sag is divided into n cycles according to the step size Δt, and the discrete sampling is obtained The sequence of points is [t 1 ,t 2 ,t 3 ,...,t n ], where n=ΔT / Δt, t n = t ...
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