Unified Iterative Power Flow Calculation Method Considering Automatic Generation Control of Interconnected Grid Zones

Abstract

The invention discloses a unified iterative load flow computing method of measurement interconnection grid partition area automatic power generation control. The method comprises the steps of adjusting measurement partition area imbalance power, wherein by introducing imbalance power factors and AGC power distribution factors into a common load flow equation, an improved load flow equation is obtained, and working conditions of the imbalance power in an independent adjusting area of AGC units in all areas are reflected; controlling measurement inter-area connection line power, wherein throughan area connection line power transmission equation, an area exchange power equation is deducted; making the improved load flow equation and the exchange power equation simultaneous to build an interconnection grid load flow computing model with a unified iterative format, and the number of variables in the model is equal to the number of the equations; utilizing a Newton method to conduct iterative solution on the interconnection grid load flow computing model. By means of the method, an actual power regulation strategy of an electrical system is considered, the method better conforms to system running working conditions, the computing result is more accurate, and the practicability is higher.

Description

technical field [0001] The invention relates to the technical field of operation analysis of interconnected grids of power systems, in particular to a unified iterative power flow calculation method taking into account the automatic power generation control of interconnected grids. Background technique [0002] In order to alleviate the energy problems in the eastern economically developed areas, in order to better absorb and utilize new energy, and to deliver the high-quality energy in the west to the load center in the east in the most economical and efficient way, my country has formulated and implemented a focus on west-to-east power transmission. Planning and construction of a "strong AC, strong direct" type transmission grid with UHV AC and UHV DC as the backbone. At that time, the transmission corridor will span multiple regions and run through multiple network structures, ultimately realizing energy transfer and intercommunication in a wider range. [0003] Under the...

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Problems solved by technology

[0004] Since the conventional power flow equation does not consider multi-regional power coordination, the unbalanced power of the entire network is only borne by one node, which cannot reflect the constraints of section power between regions. An improvement strategy has been proposed, and there have been many research results in the field of power flow calculation of interconnected grids

[0005] Throughout the current power flow calculation methods of interconnected grids, asynchronous calculation or alternate iteration strategies are mostly used. However, when analyzing special issues such as static voltage stability, a unified power flow iteration format is still required

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