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Power flow analysis device and power flow analysis method for AC-DC hybrid system

A technology for AC/DC hybrid connection and power flow analysis, which is applied to AC/DC network circuit layout, measurement devices, circuit devices, etc., and can solve problems such as long calculation time, failure to consider the coupling of DC variables and AC variables, and poor convergence.

Active Publication Date: 2021-10-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unified iterative method has better convergence accuracy, but the calculation time is longer, and it is difficult to calculate the complex network and realize the adjustment of the DC operation mode
Alternate solution method has good flexibility and high efficiency, but it does not consider the coupling between DC variables and AC variables, and the convergence is not good

Method used

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  • Power flow analysis device and power flow analysis method for AC-DC hybrid system
  • Power flow analysis device and power flow analysis method for AC-DC hybrid system
  • Power flow analysis device and power flow analysis method for AC-DC hybrid system

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Embodiment 1

[0100] Such as figure 1 As shown, according to the embodiment of the first aspect of the present invention, a power flow analysis device 100 for an AC / DC hybrid system is proposed, including: a memory 102 and a processor 104 .

[0101] Specifically, the memory 102 stores a computer program; when the processor 104 executes the computer program, the following steps are performed: obtaining the AC system voltage and commutation reactance of the direct current transmission system, the first firing angle of the rectifier, and the second firing angle of the inverter; The AC equivalent model is constructed according to the AC system voltage, commutation reactance, first firing angle and second firing angle; the power flow calculation is carried out according to the AC equivalent model, and the power flow analysis results of the AC / DC hybrid system are obtained.

[0102] In this embodiment, the structural parameters (firing angle) and control parameters (commutation reactance, AC syst...

Embodiment 2

[0109] According to an embodiment of the present invention, it includes the features defined in the above embodiments, and further, the commutation reactance includes: a commutation reactance on the rectification side and a commutation reactance on the inverter side; when the processor 104 executes the computer program, it performs , commutation reactance, first firing angle, and second firing angle to construct an AC equivalent model, specifically including: according to the AC system voltage, rectifying side commutating reactance, inverter side commutating reactance, first firing angle and second firing angle The firing angle determines the equivalent transformation ratio of the DC transmission system; the equivalent transformation ratio of the DC transmission system is calculated respectively according to the commutation reactance of the rectifier side, the commutation reactance of the inverter side, the first firing angle, the second firing angle and the equivalent transform...

Embodiment 3

[0127] According to an embodiment of the present invention, it includes the features defined in the above embodiments, and further: when the processor 104 executes the computer program, it performs power flow calculation according to the AC equivalent model to obtain the power flow analysis results of the AC / DC hybrid system The steps specifically include: solving the AC equivalent model to obtain the effective value of the AC voltage and the DC voltage of the DC transmission system; calculating the reactive power loss of the rectifier and the reactive power of the inverter according to the effective value of the AC voltage, the first ratio, and the third ratio power loss; calculate the equivalent AC current according to the DC current and the voltage phase of the rectifier side, and determine the effective value of the equivalent AC current according to the equivalent AC current; according to the effective value of the equivalent AC current and the AC equivalent model , the re...

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Abstract

The invention provides a power flow analysis device and a power flow analysis method for an AC / DC hybrid system. Wherein, the device includes: a memory, a computer program is stored in the memory; a processor, and when the processor executes the computer program, the following steps are performed: obtaining the AC system voltage and commutation reactance of the direct current transmission system, the first firing angle of the rectifier, and the The second firing angle; construct an AC equivalent model based on the AC system voltage, commutation reactance, first firing angle, and second firing angle; perform power flow calculations based on the AC equivalent model, and obtain the power flow analysis results of the AC / DC hybrid system. In this way, the power flow analysis and calculation problem of the AC-DC hybrid system is transformed into the power flow analysis and calculation problem of the pure AC system, which overcomes the problem that the variables of the DC system are not easy to decouple in the power flow analysis and calculation, and takes into account the efficiency and accuracy of the power flow calculation.

Description

technical field [0001] The invention relates to the technical field of refrigeration or heat pump systems, in particular to a power flow analysis device for an AC / DC hybrid system and a power flow analysis method for an AC / DC hybrid system. Background technique [0002] my country's energy distribution and load distribution show opposite characteristics. In order to meet the needs of economic development and environmental protection, large-scale, long-distance power energy transmission based on high-voltage direct current transmission systems has been significantly developed. AC-DC hybrid systems It has become a new form of system development. The transmission system shows a trend of developing from a pure AC system to an AC-DC hybrid system, and the system complexity has increased significantly. The traditional Newton-Raphson method as a representative of the pure AC system power flow analysis and calculation method can no longer meet the needs. At present, there are two ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06H02J3/36
CPCH02J3/06H02J3/36G01R21/1331H02J2203/20H02J13/00002H02J4/00
Inventor 董新洲王浩男金勃良
Owner TSINGHUA UNIV