Method for calculating voltage fluctuation of power grid caused by rail traction shock load

Abstract

The invention relates to a method for calculating the voltage fluctuation of power grid caused by rail traction shock load. The method is performed by applying a Power System Analysis Synthesis Package (PSASP) and comprises the following steps: 1) determining a load value on the high-voltage side of a traction station before a locomotive is started, inputting the load value into a power grid model for load flow calculation, and using a load flow calculation result as a basic load flow for transient stability calculation; 2) calculating reactive shock load values on the high-voltage side respectively when two locomotives on two arms of a traction transformer are started; and 3) applying the PSASP, stimulating reactive shock at a bus on the high-voltage side of the traction station and calculating the voltage fluctuation of a PPC point. The method has great significance for reducing the influence of the traction load on power grid shock and improving the power quality of a power system and the operating safety and stability of the power grid.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering, in particular to a method for calculating voltage fluctuations of a power grid caused by railway traction impact loads. Background technique [0002] The traction power of the electrified railway is an electric locomotive. The locomotive itself does not carry energy, and the required energy is provided by the electric traction power supply system. The traction power supply system mainly refers to the traction substation and catenary. The substation is located near the railway, and it sends the current from the power plant through the high-voltage transmission line to the catenary above the railway. Catenary is a device that directly transmits electric energy to electric locomotives. Along both sides of the railway line, a row of pillars is erected, with metal wires hanging from it, which is the catenary. The electric locomotive uses the pantograph on the roof to obtain elect...

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Problems solved by technology

[0005] However, since the railway traction load is a single-phase power supply load, when the power system supplies power to it, the three-phase load of the power system will be unbalanced; in addition, the reactive power impact load will also generate an increase in reactive power loss inside the traction transformer. This increment should also be taken into account when calculating voltage fluctuations

The above two factors are not considered in the traditional calculation method, so the traditional method of simulating the three-phase symmetrical system cannot be directly applied to the simulation calculation of the influence of railway traction load on voltage shock

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