Power regulation method and system for large-scale new energy access direct current power grid

Abstract

The invention discloses a power regulation method and system for a large-scale new energy access direct current power grid. The method comprises the following steps that: collecting a section active power value on a new energy power gathering position in real time; carrying out calculation to obtain a regulation key parameter, wherein the regulation key parameter comprises a threshold value interval formed by a regulation upper limit threshold value and a regulation lower limit threshold value; judging whether the section active power value exceeds the threshold value interval or not in real time; and if the section active power value exceeds the threshold value interval, according to a preset power regulation quantity value, sending a power regulation instruction to each sub-station to finish the section active power regulation. By use of the method and the system, when new energy power exceeds the rated capacity of a current converter, large power deficiency and disturbance caused bygenerator tripping or current converter locking can be avoided. By use of the method and the system, new energy output and the use ratio of the current converter can be improved, meanwhile, the section active power is dynamically regulated, the fluctuation ratio of the active power is lowered on a premise that the current converter guarantees to be safe, and the operation safety of the direct current power grid is improved.

Description

technical field [0001] The present invention relates to the field of electric power technology, and more specifically, to a power regulation method and system for connecting large-scale new energy to a DC power grid. Background technique [0002] As a non-renewable resource, traditional fossil energy is gradually being exhausted. Environmental problems such as global warming and air pollution caused by the massive consumption of fossil energy have posed a huge threat to human existence. The development of clean and renewable new energy has become an inevitable choice for human sustainable development. As the most mature and promising new energy, wind power and photovoltaic power have developed rapidly in recent years. As of mid-2017, the installed capacity of wind power in my country reached 154 million kilowatts, and the installed capacity of photovoltaic power generation reached 102 million kilowatts, accounting for more than 13% of the country's installed power generati...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the background technology that when the active power of the section exceeds the rated capacity of the converter, the system is disturbed by blocking the converter or switching off the machine, and when the traditional control method is returned, the output power of the new energy station will be generated near the power limit To solve the problem of relatively large fluctuations, the present invention provides a power regulation method and system for connecting large-scale new energy to the DC power grid. The method and system collect the large-scale new energy collection points in real time When the new energy output is close to the rated capacity of the converter, the power of the new energy connected to the DC grid is adaptively adjusted to keep within the upper and lower limit thresholds; the power of the large-scale new energy connected to the DC grid Adjustment methods include:

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