Broadband electromechanical-electromagnetic hybrid simulation method for large-scale AC/DC system
An AC-DC system, electromagnetic hybrid technology, applied in electrical digital data processing, instrumentation, computing and other directions, can solve the simulation scale limitation, the electromagnetic transient characteristics of power electronic devices cannot be accurately described, and the simulation results cannot accurately describe the equivalent network Electromechanical transient electromagnetic transient characteristics and other issues
Active Publication Date: 2019-08-16
YUNNAN POWER GRID
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Problems solved by technology
[0003] For the simulation of power system, if only the electromagnetic transient simulation program is used, the simulation scale is usually limited, so most areas of the power grid need to be equivalently simplified to perform the electromagnetic transient calculation of the entire network, which will lead to inaccurate simulation results Describe the electromechanical transient state and its electromagnetic transient characteristics of the equivalent network; if only the electromechanical transient program is used, the electromagnetic transient characteristics of power electronic devices and nonlinear loads cannot be accurately described
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Embodiment 1
[0055] A broadband electromechanical-electromagnetic hybrid simulation method for large-scale AC and DC systems, including the following steps:
[0056] Step 1: Determine the initial value of the state variable.
[0057] The network-wide power flow initialization determines the initial value of each state variable, including the simulation step size, network topology, and power flow data;
[0058] Step 2: Divide the Electromechanical and Electromagnetic Subsystems
[0059] Divide the system into an electromechanical subsystem and multiple electromagnetic subsystems, in which power electronic components are included in the electronic subsystem, and the broadband interaction between the electromechanical subsystem and the electromagnetic subsystem is characterized by a frequency-dependent equivalent model;
[0060] Step 3: Calculate the equivalent circuit of the low-frequency interface of the electromagnetic subsystem
[0061] Calculate the equivalent circuit of the low-freque...
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The invention relates to a broadband electromechanical-electromagnetic hybrid simulation method for a large-scale AC / DC system, belongs to the technical field of electromagnetic transient analysis ofa power system. The method comprises the following steps: initializing each state variable; dividing the system into an electromechanical subsystem and an electromagnetic subsystem; obtaining a differential equation of the electromagnetic subsystem and a differential equation of the electromechanical subsystem respectively; and then solving the differential algebraic equation of the electromechanical subsystem in a simultaneous manner to obtain the value of each state variable in the electromechanical subsystem, bringing the newly obtained state variables back to the differential equation foriterative solution until the simulation time reaches the set time, and finally obtaining the electromagnetic transient simulation result of the power system containing the power electronic unit. According to the method, the requirements for simulation precision and numerical stability can be met, meanwhile, the simulation efficiency is greatly improved, and engineering popularization and implementation are facilitated.
Description
technical field [0001] The invention belongs to the technical field of electromagnetic transient analysis of power systems, and in particular relates to a broadband electromechanical-electromagnetic hybrid simulation method for large-scale AC and DC systems. Background technique [0002] At present, with the expansion of the grid scale, a large number of converter-based power electronic devices are connected to the AC grid, and the interaction frequency band between the converter and the grid is becoming wider and more complex. [0003] For the simulation of power system, if only the electromagnetic transient simulation program is used, the simulation scale is usually limited, so most areas of the power grid need to be equivalently simplified to perform the electromagnetic transient calculation of the entire network, which will lead to inaccurate simulation results Describe the electromechanical transient state and its electromagnetic transient characteristics of the equival...
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CPCG06F30/367
Inventor 谢小荣段荣华舒德兀吴琛刘威黄伟程旻
Owner YUNNAN POWER GRID