Smooth starting method for electromagnetic/electromechanical transient hybrid simulation of large power grid

Abstract

The invention relates to a smooth starting method for electromagnetic / electromechanical transient hybrid simulation of a large power grid, belonging to the technical field of digital simulation of the large power grid. The method comprises the following steps of: firstly, using a power source equivalent first sub-grid at a grid-division interface at an electromechanical transient side of the hybrid simulation; setting a power flow model of a second sub-grid according to a target steady state, making the second sub-grid be in the target steady state; using a voltage source equivalent second sub-grid at the grid-division interface of the electromagnetic transient side, making a first sub-grid be in a first steady state; connecting a small internal resistance voltage source to a generator terminal of a generator of the first sub-grid in parallel, and executing of electromagnetic transient side simulation calculation of the hybrid simulation to get the output power of the small internal resistance voltage source. The output power of the small internal resistance voltage source is eliminated in the simulation calculation of the electromagnetic transient side first sub-grid so as to start the hybrid simulation calculation. The smooth starting method of the invention ensures that both sides of hybrid simulation can quickly and steadily enter the target steady state after closed-loop starting, so that accurate initialization and quick smooth starting of the electromagnetic / electromechanical transient hybrid simulation are more convenient and effective.

Description

technical field [0001] The invention relates to an electromagnetic / electromechanical transient mixed simulation flat start method of a large power grid, which belongs to the technical field of digital simulation of large power grids. Background technique [0002] In the application and practical application of hybrid simulation technology, the scale of simulation objects gradually increases, and hybrid simulation begins to be used in the simulation of real large power grids. The scale of the electromagnetic transient side system becomes larger, and the number of dynamic components such as generators increases sharply. In order to ensure the smooth closed-loop start of the hybrid simulation and establish the expected initial stable state, a lot of manpower and experiments are needed for tedious adjustments. [0003] In the actual operation of the power grid, various transient processes are coupled with each other, and the typical ones are electromagnetic transient process and...

AI Technical Summary

Problems solved by technology

However, after the initialization of dynamic components such as generators on the electromagnetic transient side, the power injected into the grid is significantly different from the power flow calculation results

Therefore, after the hybrid simulation closed-loop interface, the power grid deviates from the target stable state and enters a new stable state. In severe cases, the stable state of the first subnetwork and the second subnetwork at the interface position is quite different, resulting in the instant hybrid simulation closed-loop simulation of the first subnetwork and the second subnetwork. The second subnetwork is greatly disturbed, and the mixed simulation delays the establishment of the initial stable state, and even fails to establish a valid initial stable state

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