Optimization method of direct-current transmission control protection system during strong oscillation of alternating-current system
A DC transmission control and AC system technology, applied in AC network circuits, power transmission AC networks, reducing/preventing power oscillations, etc., can solve problems such as instability, collapse, and lack of DC systems in large power grids, and achieve improved stability, Avoid collapse and reduce the effect of secondary impact
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Embodiment 1
[0033] like figure 1 As shown, Embodiment 1 of the present disclosure provides an optimization method for a DC transmission control and protection system during strong oscillation of an AC system, including the following steps:
[0034] Identify the out-of-step oscillation center position and oscillation mode. When the oscillation center is at the AC network position on the inverter side, and it is an out-of-step oscillation with an oscillation frequency less than 10Hz, automatically extend the DC transmission commutation failure protection time setting (currently conventional DC Phase failure protection time is set to 2.6 seconds);
[0035] At the same time, control the set value of decoupling time of the AC system on the inverter side to be less than the extended commutation failure protection time set value to ensure that the AC system completes decoupling and isolates the oscillation source before DC blocking, and reduces the out-of-step oscillation period of the AC networ...
Embodiment 2
[0048] Embodiment 2 of the present disclosure provides an optimization system for a DC transmission control and protection system during strong oscillation of an AC system, including:
[0049] The data acquisition module is configured to: acquire the operation status data of the AC and DC power grid system;
[0050] The oscillation identification module is configured to: identify the AC oscillation center position and oscillation mode according to the obtained operating state data;
[0051] The optimization control module is configured to: when the oscillation center is at the position of the AC network on the inverter side, and the oscillation frequency is out-of-step oscillation with an oscillation frequency lower than the preset frequency, prolong the DC transmission commutation failure protection time setting value, and control the AC system on the inverter side The delisting time setting value is less than the extended commutation failure protection time setting value.
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Embodiment 3
[0054] Embodiment 3 of the present disclosure provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the optimization of the DC transmission control and protection system during strong oscillation of the AC system as described in Embodiment 1 of the present disclosure is realized. Steps in the method, the steps being:
[0055] Obtain the operating status data of the AC and DC grid system;
[0056] Identify the AC oscillation center position and oscillation mode based on the obtained operating state data;
[0057] When the oscillation center is at the position of the AC network on the inverter side, and the out-of-step oscillation with the oscillation frequency less than the preset frequency, extend the DC transmission phase commutation failure protection time setting value, and control the inverter side AC system unloading time setting value to be less than the extended time Commutation failure protection time se...
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