Multi-rate simulation method and system for joint simulation of flexible HVDC AC power network

A technology of AC power grid and simulation method, applied in the direction of electrical components, etc., can solve problems such as undiscovered

Inactive Publication Date: 2019-01-04
CHINA ELECTRIC POWER RES INST +2
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  • Multi-rate simulation method and system for joint simulation of flexible HVDC AC power network
  • Multi-rate simulation method and system for joint simulation of flexible HVDC AC power network
  • Multi-rate simulation method and system for joint simulation of flexible HVDC AC power network

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Embodiment 1

[0155] Using the method proposed by the present invention to build a 2-terminal pseudo-bipolar MMC DC transmission system example, and compare it with the electromagnetic transient model in PSCAD. The structure of the example side is as follows figure 2 . The per-unit parameters of each component on the AC side, taking the system capacity as the base value, are as follows: rheological resistance Rt=0, reactance L t =0.075, generator reactance 0.082, commutation resistance Rc=0, reactance L c = 0.083. The DC line resistance is 5.683 ohms, the inductance is 0.376 henries, and the capacitance is 132 microfarads. The level number of the converter valve is 31, and the capacitance of the sub-module is 600 microfarads. The d-axis adopts master-slave control, and the q-axis is controlled by constant reactive power. 1.8s Three-phase grounding occurs on the grid side busbar of the transformer at the receiving end, and the grounding resistance is 0.01 ohms, which lasts for 0.1s.

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Abstract

The invention relates to a multi-rate simulation method and system for the joint simulation of a flexible HVDC AC power network, which establishes a power network model of a large AC / DC hybrid power network containing a VSC based on the multi-rate. A small-step VSC model is established according to the power network model. The simulation of the interface between small step VSC model and AC systemis carried out. The simplified discrete Newton method is used to calculate the VSC model of small step voltage source converter. This method can adopt different simulation step sizes for flexible DC and AC systems. The step size of DC part is variable, and the minimum can be as small as 0.0001 s. The typical step size of electromechanical transient is adopted for AC network. The AC network provides information to VSC by linear interpolation. The VSC injected into the AC grid uses multiple time steps of average power. Using multi-rate simulation can improve the computational efficiency of large-scale power system with different simulation step size models. A simplified discrete Newton method is used to improve the convergence problem of alternating iteration caused by high power injection of VSC into AC power system.

Description

technical field [0001] The invention relates to a transient analysis and calculation method of a power system, in particular to a multi-rate simulation method and system for joint simulation of flexible DC and AC power grids. Background technique [0002] The excellent operating characteristics of Voltage Source Converter-High Voltage Direct Current (VSC-HVDC) will inevitably become an important power transmission equipment for ultra-large-scale power grids in the future. Constructing a VSC-HVDC electromechanical transient model with sufficient accuracy and calculation speed to support large-scale power grid stability analysis is the basis for the safe operation of the future power grid. [0003] The VSC electromechanical transient model is a simplification of the electromagnetic transient model, and the current research focuses on two aspects. One is to rely on the self-defined functional modeling of large-scale electromechanical transient simulation software, such as lite...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00
CPCH02J5/00
Inventor 江涵丁平安宁张星徐得超李亚楼田芳
Owner CHINA ELECTRIC POWER RES INST
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