Method for computing alternating current system current injected into direct current system

A technology of DC system and AC system, which is applied in the direction of single-grid parallel feeding arrangement, etc.

Active Publication Date: 2010-12-15
CHINA ELECTRIC POWER RES INST +1
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  • Claims
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Problems solved by technology

The invention is a core algorithm for studying the mutual influence of AC and DC systems, which can be used for planning and operation control of AC and DC power grids, overcomes the disadvantage of using many variables to describe the relationship b

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  • Method for computing alternating current system current injected into direct current system
  • Method for computing alternating current system current injected into direct current system
  • Method for computing alternating current system current injected into direct current system

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Embodiment Construction

[0085] The following is an implementation example of the present invention, such as image 3 Shown: The simulation test system is based on CIGRE Benchmark 1000MW / 500kV DC system. In order to calculate the difference in the current injected into the AC system by the DC system under different control modes, the AC system at the receiving end is appropriately modified, and the short-circuit ratio is adjusted to 4.75 to adapt to the simulation verification calculation of the present invention. Further explanation is as follows:

[0086] (1) In the simulation test system, the AC and DC system starts at 0 seconds, and enters a stable operation state after about 0.5 seconds; at 2.0 seconds, a three-phase metallic short circuit occurs somewhere in the second branch of the receiving end, and the fault lasts for 1.0 seconds seconds, the fault ends at 3.0 seconds, and the AC / DC system gradually returns to the initial operating state. The operating state of the AC-DC system changes unde...

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Abstract

The invention provides a method for computing an alternating current system current injected into a direct current system, which can reflect the operation conditions of an alternating current system and corresponding injected current change caused by the change of a direct current control mode, and comprises a fixed-power and fixed-voltage control, fixed-power and fixed-extinction angle control, fixed-current and fixed-voltage control, fixed-current and fixed-extinction angle control, fixed-current control with a low-voltage current limiting process and control characteristics under the condition that the phase switching of a direct current system fails. The method is a core algorithm for studying the mutual influences between alternating current and direct current systems, can be used for planning and operation control of alternating current and direct current power grids, overcomes the drawback of multiple variables used for describing the relationship between alternating and direct currents, solves the problem of the computation of the alternating current system current injected into a direct current system, and provides a technical method for studying the mutual influences between the alternating current and direct current systems in power grid planning and operation.

Description

technical field [0001] The invention relates to the planning and operation of an AC and DC power system, in particular to a calculation method for the external characteristics of the DC system and the current injected into the AC system. Background technique [0002] As more and more EHV / UHV DC transmission systems are fed into the power grid, the impact of AC-DC system interaction on the safe and stable operation of the power grid is becoming more and more obvious, which brings many technical difficulties to the planning and operation of the power grid. Scholars at home and abroad A lot of research has been done on the above issues. However, there is still a lack of calculation methods to describe the current injected into the AC system by the DC system, and there are problems such as complicated and unintuitive formulas for describing the interaction of the AC and DC systems. The present invention proposes a set of analytical calculation method for DC system to inject AC ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 郭小江卜广全周静
Owner CHINA ELECTRIC POWER RES INST
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