Hybrid real-time simulation method for alternating current-direct current power system

Abstract

The invention relates to a hybrid real-time simulation method for an alternating current-direct current power system, and belongs to the technical field of transient simulation of the power system. The power system is divided into an electromagnetic transient side and an electromechanical transient side; a response model of voltage input and power output between the two sides, an electromagnetic transient side equivalent calculation power module and an electrochemical transient side ideal voltage source model are established; when the simulated power system is failed or violently disturbed, a network voltage equation of the power system is solved so as to obtain an interface boundary condition for the occurrence of the failure or large disturbance; and during the occurrence of the failure or large disturbance and system recovery, a simulation interactive step is adjusted for predicting a boundary parameter required by simulation, and the boundary parameter is then corrected so as to obtain the boundary condition at a sub-network interface of the alternating current-direct current system. The method effectively and accurately simulates and imitates the alternating current-direct current power system, so that the simulation result of a transient process under the failure or large disturbance at a near end of the sub-network interface of the alternating current-direct current system is consistent with the fine fully electromagnetic transient simulation result.

Description

technical field [0001] The invention relates to a hybrid real-time simulation method of an AC / DC power system, in particular to a large-scale actual AC / DC system, and belongs to the technical field of power system transient simulation. Background technique [0002] The demand for electrical energy in modern industrial and agricultural production, society and people's life has increased sharply, and the power system has developed rapidly. At the same time, new and fast-response controllers and devices are widely used in the power system, especially the commissioning of many DC transmission projects and the commissioning of a large number of large-capacity power electronic devices in the power grid, which makes various transient processes in the power system tightly coupled. The electromagnetic transient process and the electromechanical transient process contained in the transient behavior and process of the power system are organically combined and are a continuous process, ...

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Problems solved by technology

However, the main problems are: the frequency-related equivalent is difficult to achieve, and it is basically impossible to achieve it in the actual large-scale power grid; the fundamental wave equivalent impedance will cause serious errors in the simulation results of the interface harmonic process simulation by hybrid simulation, but the reason analysis Not thorough; the applicability and necessity of frequency-dependent equivalent impedance and fundamental equivalent impedance are not yet clear, and there is a lack of interface models for practical engineering applications

In the transient process simulation of the system recovery stage after the fault, the interface quantity has obvious fluctuations. The existence of interaction errors affects the correct physical interaction process of the systems on both sides of the simulation object, and under the accumulation of interaction errors at each interaction step, the closed-loop mixing The simulation distorts the transient characteristics of the systems on both sides, especially the system has not recovered to a steady state within a short period of time after the fault, the frequency and amplitude of interface fluctuations are large, and the interaction error is relatively prominent

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