A receiving-end grid structure optimization method for multi-DC centralized feed-in
A technology of multiple DC feed-in and receiving-end power grids, which is applied in the field of power systems and can solve problems such as large computational workload and ideal effects.
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[0147] In the embodiment of the present invention, the planning map of Shanghai's 500 kV and above power grid in 2015 is as follows Figure 5 shown in Figure 5 The planned power grid in Shanghai in 2015 is the analysis object. Considering a 5% margin, for a circuit breaker with a maximum breaking current of 50kA, set the upper limit of the short-circuit current control to 47.50kA; for a circuit breaker with a maximum breaking current of 63kA, set the upper limit of the short-circuit current control to 59.85kA. Set the impedance range of the current-limiting reactor to 0~10Ω; the minimum value of the multi-infeed short-circuit ratio is 2.5; the cost coefficient of breaking the line is k as =60,k bs = 0, the cost coefficient of installing a current-limiting reactor is k as =625,k bs =25.
[0148] According to the plan, by 2015, Shanghai Power Grid will have 4 DC drop points in Fengjing, Nanqiao, Huaxin, and Fengxian, forming a typical multi-infeed DC receiving end system. ...
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