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UHVDC simplification and simulation model which faces power characteristic

A simulation model and power characteristic technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of rough DC converter station model, long simulation time, and inconsistent reactive power/voltage characteristics of the converter station exit busbar. Accuracy and other issues to achieve the effect of reducing the amount of simulation calculations and simplifying the adjustment process

Active Publication Date: 2017-08-29
HOHAI UNIV
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Problems solved by technology

[0003] On the one hand, the DC converter station model of most of the existing simulation software is very rough, and the reactive power / voltage characteristics of the converter station outlet bus are even more inaccurate
On the other hand, the existing simulation models are all based on the electromagnetic process, taking into account the detailed switching characteristics of semiconductor devices and the detailed controller model. The dynamic behavior of each component and the controller is complex, which makes the simulation time long and the amount of calculation too high. Big

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  • UHVDC simplification and simulation model which faces power characteristic

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Embodiment

[0065] Commutation failure is one of the most common faults in DC converter stations. Taking commutation failure as an example, the specific process of the simulation modeling of the present invention is described in detail, including the following steps:

[0066] 1) Analyze a large number of measured data and internal mechanisms in HVDC systems, and study the regularity of converter control angles (rectifier firing angle α and inverter arc extinguishing angle γ) when commutation fails, or use the existing The detailed model simulation obtains the dynamic curve, and obtains the change characteristics of the control angle when the commutation fails. When the commutation fails, the change of the control angle is as follows: Figure 4 as shown, Figure 4 (a) is the variation curve of the delayed firing angle α of the rectifier, Figure 4 (b) is the change curve of the delayed firing angle α of the inverter. It is known that the relationship between the inverter arc extinguishin...

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Abstract

The invention provides a UHVDC simplification and simulation model which faces a power characteristic, and belongs to the field of electric power system modeling and simulation. In the UHVDC simplification and simulation model which faces the power characteristic, fast dynamic procedures inside converter stations are omitted, in stable operation of the converter stations, only a response behavior at a backstage after being influenced by a power grid state change is taken into account, and the converter stations at the two sides are equalized to be controlled voltage sources or controlled current sources. A typical operation state in a high voltage direction current transmission system is selected as a preset mode, a change law of a controlled angle of a converter under the preset mode is analyzed, a mathematical expression model of the controlled angle is established, and a controller model is simplified. According to the UHVDC simplification and simulation model which faces the power characteristic, on the basis that enough precision is guaranteed, the adjusting process of the controller is simplified, the simulation calculation amount is reduced, and the UHVDC simplification and simulation model is applicable to electromechanical transient simulation analysis of the converter stations.

Description

technical field [0001] The invention relates to the technical field of power system modeling and simulation, in particular to a power characteristic-oriented UHVDC simplified simulation model, which is suitable for simulation calculation of electromechanical processes in large power grids. Background technique [0002] Ultra-high voltage direct current (UHVDC) refers to direct current transmission and related technologies with a voltage level of ±800kV and above. An important part of. In order to obtain satisfactory operation characteristics, the performance of the HVDC transmission system, possible problems and their solutions must be anticipated during the planning and design phase and actual operation. The operation of UHV DC systems is affected by faults that occur on DC lines, converters or AC systems. The impact of the fault is reflected by the action of the converter control. Therefore, for the faults of the AC system and its DC system, the HVDC system must have a ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 陈谦鞠平赵健周聪金宇清余一平周海强唐莹莹秦川陈广巍姜梦
Owner HOHAI UNIV
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