Dynamic allocation method and device for AGC units based on active power gap

Abstract

The invention discloses a dynamic allocation method and device for an AGC unit based on a regional power grid active power gap. The method comprises the steps: monitoring whether the regional power grid has a fault or not; calculating an overall active power vacancy value, an overall active power change rate and an emergency active power change rate in a network in real time; and adding or quitting allocation on the AGC unit according to the rate gap if the emergency active power change rate is higher than or lower than an existing overall active power change rate in the network. The AGC unitis deployed according to the real-time active power change rate of a power grid, thereby guaranteeing the average value, zero crossing and other indexes of the power grid area control deviation withinthe specified time. The number of AGC units in the period is controlled when the power grid fluctuation is small, thereby reducing the frequency fluctuation of a power grid system, avoiding invalid actions of the units, and achieving coordinated development of a power grid source.

Description

technical field [0001] The invention relates to the technical field of network source coordinated control, in particular to an AGC unit dynamic deployment method based on the active power gap of a regional power grid. Background technique [0002] Under the new situation of UHV power grid interconnection with regional power grids, power grids at all levels are increasingly connected, and the requirements for coordination and cooperation between power grids and generating units are also getting higher and higher. At the same time, my country's new energy installed capacity and power generation have increased rapidly, and the proportion of new energy installed capacity (wind power, photovoltaic, nuclear power) has increased from less than 16% at the end of 2016 to more than 18.5% at the end of September 2017. As of September 2017, the total installed capacity of new energy reached 275GW, and the newly installed thermal power accounted for only 33%, far lower than the 64% of th...

AI Technical Summary

Problems solved by technology

In the actual operation of the power grid, since the rate and number of units put into AGC mode are fixed every day, that is, the daily active power change rate of the entire power grid is fixed, which can easily cause the overall power of the unit to be adjusted within a certain period of time during the day. Insufficient or redundant change capability cannot guarantee that the average value of the regional control deviation of the grid within a certain period of time is controlled within the specified range. If the ACE is too large, it is necessary to remove a large number of operating units from the power grid at the sending end, and remove a certain amount of load from the power grid at the receiving end. Otherwise, a chain reaction will occur and the system will become unstable.

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