Grid-connected unit primary frequency modulation rapid adjustment system and method in direct current faults

Abstract

The present invention discloses a grid-connected unit primary frequency modulation rapid adjustment system and method in direct current faults. The system comprises a monitoring module and a frequencymodulation control module which are connected through a transmission channel, the monitoring module is configured to perform power change monitoring and fault monitoring through operation of the direct current circuit in a regional power grid, generate direct current emergency frequency modulation signals when it is integrally determined that the power change monitoring and fault monitoring bothmeet a certain condition, and calculate quantified emergency frequency deviation value signals according to the momentary fluctuation value condition of the direct current power in the regional powergrid; and the frequency modulation control module is configured to perform dynamic switching of the frequency deviation value of the unit frequency modulation control logic to achieve emergency advanced adjustment of the frequency. The grid-connected unit primary frequency modulation rapid adjustment system and method in direct current faults perform emergency frequency modulation control for thegrid-connected unit in a pointed mode to effectively solve the problem that the response of the grid-connected unit is not synchronous when the switching power is greatly fluctuated caused by faults of the direct current circuit at the advanced unit frequency modulation response time point and ensure the high synchronism of the grid-connected unit and the power grid frequency fluctuation.

Description

Technical field [0001] The invention relates to the technical field of network source coordination, in particular to a system and method for rapid adjustment of primary frequency of a grid-connected unit under DC failure. Background technique [0002] With the rapid development of my country's economy, the demand for electricity and the scale of the power grid are increasing. However, the distribution of resources and economic development in my country are not balanced. In order to improve the economy of power grid operation and realize the optimal allocation of resources, the scale of high-voltage interconnected power grid construction has been expanding in recent years. Since the 1980s, High Voltage Direct Current (HVDC) technology has gradually matured. HVDC can realize the interconnection of asynchronous AC power grids. It has large transmission power and high efficiency, and has great advantages in large-scale long-distance transmission. . While high-voltage direct current ...

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Problems solved by technology

However, different from the time point when the extreme value of the frequency difference at the fault point appears, the unit has a different time delay. This delay time causes a lag in the power response of the unit based on the frequency deviation value, resulting in a large drop in the grid frequency

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