A power regulation method and system for connecting large-scale new energy to a DC power grid

Abstract

The invention discloses a power regulation method and system for connecting large-scale new energy sources to a direct current power grid. The method includes: collecting real-time active power values ​​of cross-sections at new energy power collection points; calculating and obtaining key parameters for adjustment; the key parameters for adjusting Including a threshold interval composed of an adjustment upper limit threshold and an adjustment lower limit threshold; judge in real time whether the active power value of the section exceeds the threshold interval; if it exceeds the threshold interval, send it to each sub-field station according to the preset power adjustment value The power adjustment command completes the section active power adjustment; when the new energy power exceeds the rated capacity of the converter, the method and system avoid large power loss and disturbance caused by machine cut-off or converter lockout; the method and The system improves the output of new energy and the utilization rate of the converter. At the same time, by dynamically adjusting the active power of the section, it can reduce the fluctuation rate of active power while ensuring the safety of the converter, and improve the safety of the operation of the DC power grid.

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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