Research On AVC Strategy Based On Forecasting Of Reactive Load

The electricity grid of Dongguan,a typical terminal network,located in the load center of the Guangdong power grid,is an indispensable part of Guangdong power grid.With developing economic and increasing load demand,the scale of the network becomes larger and more complicated continuously.Along with the generalization of the concept of control integration,the original voltage control methodology,which is controlled by the system operators manually,has been taken place by the Automatic Voltage Control System(AVC)gradually.Due to the short trial operation of the AVC system in 2015,the AVC control strategy cannot adapt to the Dongguan power grid totally.As a result,problems and mismatches occur during the system operating.For example,the frequently switch of reactive power compensation devices and transformer voltage tap positions,the lagging control during the peak-valley alternating period and the low acting adaption of preset threshold values.In this paper,according to the load features of Dongguan power grid,combined with the actual situation of Dongguan energy management system(EMS),the reactive power fuzzy prediction method based on node load fuzzy theory,through reasonable data processing,using the fuzzy idea to derive nodal load forecasting results,combined with the fuzzy control system and closed-loop feedback fault correction deviation load caused by mutation,example analysis of the load forecasting method with higher availability.According to the load forecasting results,based on the reactive power balance in the each area of the reactive sub optimal distribution of reactive power optimization strategy in advance to the 220 kV bus voltage and reactive power as constraints,and based on the bus reactive power compensation device of active power and reactive power calculation of voltage level,optimize the configuration of 220 kV transformer on load the power supply voltage and area 110 kV transformer OLTC gear,AVC output control strategy for the future period of time.In order to overcome with sudden and accidental load and voltage of the mutation,real time voltage nine zone diagram control was presented to ensure the voltage qualified rate.Combining with the advanced reactive power control and real-time voltage control,reactive power and voltage control strategy realizes the optimization of reactive power and voltage regulation devices,which reducing power loss and the repeated action of equipment,releasing dispatcher and monitor,really promoting the AVC quality.In this dissertation,the practical operating situation of the advanced AVC strategy in Changan district and Lixin district,belong to the Dongguan power grid,is demonstrated and analyzed by comparing with the traditional AVC strategy.