Inverter active current priority distribution method and system under frequency disturbance

Abstract

The invention discloses an inverter active current priority distribution method and an inverter active current priority distribution system under frequency disturbance. The method comprises the following steps of acquiring the power data of a grid-connected point of a new energy unit; when the new energy unit is in frequency disturbance, calculating according to the power data to obtain an original active current adjustment value; calculating to obtain a dynamically distributed reactive current adjustment value according to the original active current adjustment value; adjusting an inverter ofthe new energy unit according to the dynamically distributed reactive current adjustment value and an original active current adjustment value, and re-collecting the power data of the grid-connectedpoint of the new energy unit; and judging whether the new energy unit recovers steady-state operation or not according to the re-collected power data. According to the method and system, the dynamic distribution control is carried out on the basis of frequency control output, and it is guaranteed that the new energy unit can effectively participate in voltage control and frequency control of the power system.

Description

technical field [0001] The present invention relates to the field of electric power technology, and more specifically, to a method and system for prioritizing active current distribution of inverters under frequency disturbance. Background technique [0002] In the case of large-scale renewable energy penetration into the power system, the frequency regulation and voltage regulation of the power system are still undertaken by conventional synchronous units, while the intermittent, fluctuating and incomplete controllability of renewable energy lead to system frequency and The voltage problem is more prominent. At the same time, during the power grid failure, the new energy units may also be protected and disconnected from the grid, further deteriorating the system stability. Off-grid further deteriorates the system frequency, leading to low-frequency load shedding action, which removes about 5% of the load and causes a major blackout. Therefore, power electronic equipment (su...

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Problems solved by technology

[0003] In order to solve the problem of abnormality caused by unbalanced distribution of active and reactive current in the case of frequency disturbance existing in the background technology, the present invention provides a Inverter active current priority allocation method and system under frequency disturbance, the method and system in the case of frequency disturbance, through dynamic allocation control on the basis of voltage control and frequency control output, to obtain the inverter can withstand A scheme for prioritizing active power distribution within the current range, the inverter active current priority distribution method under frequency disturbance includes:

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