Method and system for suppressing DC overvoltage after blocking fault based on virtual modulation
A DC voltage and post-fault technology, which is applied in the field of DC overvoltage suppression based on virtual modulation-based blocking faults, can solve problems such as damage to power electronic devices and capacitors, endangering the safe and stable operation of converter stations, and high cost of energy-consuming resistors. Achieve the effects of suppressing DC overvoltage, reducing power, and suppressing rising speed
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Embodiment 1
[0028] See attached figure 2 As shown, this embodiment discloses a DC overvoltage suppression method after a blocking fault based on additional virtual modulation, including:
[0029] Measure the DC voltage signal when the new energy island is connected to the flexible direct grid;
[0030] judging whether the additional virtual modulation control strategy is enabled based on the DC voltage signal;
[0031] The time to reach the DC voltage limit is extended by using the additional virtual modulation control strategy, and the DC overvoltage after the blocking fault is suppressed.
[0032] The technical solution of this embodiment example of the present invention can suppress the DC overvoltage problem existing in the multi-terminal DC grid, suppress the rising speed of the DC voltage, and prolong the time to reach the DC overvoltage limit.
[0033] In a specific embodiment, the following steps are specifically included:
[0034] Step (1): Detect the operation status of the ...
Embodiment 2
[0057] See attached figure 1 As shown, the purpose of this embodiment is to provide a DC overvoltage suppression system after a blocking fault based on additional virtual modulation, including: a voltage measurement unit and a controller;
[0058] The voltage measurement unit measures the DC voltage signal when the new energy island is connected to the flexible direct grid;
[0059] The controller judges whether the additional virtual modulation control strategy is enabled based on the DC voltage signal;
[0060] The time to reach the DC voltage limit is extended by using the input of the additional virtual modulation control unit, and the DC overvoltage after the blocking fault is suppressed.
[0061] In a specific embodiment, the additional virtual modulation control unit includes: a comparator, a first adder, a second adder, a first proportional controller, a second proportional controller, a selector, and a third adder;
[0062] The first adder is connected to the select...
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