Voltage stability judgment method based on key direct current of multi-infeed AC/DC system

An AC/DC system, voltage stability technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as less dynamic research on DC transmission systems

Active Publication Date: 2016-05-11
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many literatures consider the dynamic characteristics of generators and excitation systems, OLTC, reactive power compensation equipment and loads in the study of small-disturbance voltage stability, but very few studies consider the dynamic characteristics of HVDC
Moreover, there are no relevant reports at home and abroad on judging the key DC of the multi-infeed AC-DC system based on the small-disturbance voltage stability analysis method

Method used

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  • Voltage stability judgment method based on key direct current of multi-infeed AC/DC system
  • Voltage stability judgment method based on key direct current of multi-infeed AC/DC system
  • Voltage stability judgment method based on key direct current of multi-infeed AC/DC system

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Embodiment

[0042] Embodiment: Taking a calculation example system including two-circuit DC transmission lines as an example, a method for judging the key DC that affects voltage stability in a multi-infeed AC-DC system is studied. The equivalent circuit of the two-fed AC and DC example system is as follows: figure 1As shown, the inverter sides of the two DC circuits are connected to the adjacent same side, the commutation buses of the inverter side are connected through an AC line, and the rectifier sides of the DC system are independent of each other. The main control mode of DC system 1 is constant power control, and the main control mode of DC system 2 is constant current control. The sending end system is an infinite power unit, and the receiving end AC system model is represented by the system equivalent potential source series equivalent impedance. The power flow diagram of the system in steady state operation is as follows: figure 2 shown.

[0043] Step 1: Collect the network ...

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Abstract

The invention provides a voltage stability judgment method based on a key direct current of a multi-infeed AC/DC system. The method comprises the following steps: collecting network parameters of the multi-infeed AC/DC system, a dynamic element model and model parameters, and building a differential-algebra equation set of the multi-infeed AC/DC system; executing linear processing on a system steady-state point (X<0> and Y<0>), and obtaining a linear dynamic system model; determining a system feature value and corresponding left feature vector and right feature vector on the basis of a small-disturbance stability analysis method, obtaining the feature values lambda<Ui> (i=1,2, ... ,m) related to the stability in the multi-infeed AC/DC system through the extinction angle correlation ratio rho<gammai> and determining the minimum feature value lambda<Umin>; and judging the small-disturbance voltage stability of the multi-infeed AC/DC system by the lambda<Umin>, and determining the key direct current of affecting the system voltage stability according to a participation factor p<jmin> corresponding to the lambda<Umin>. The method is suitable for computational analysis of a power system, can effectively and quickly search the key direct current of affecting the voltage stability of the multi-infeed AC/DC system, and provides a new technical support for prevention of a voltage collapse accident of a large power grid.

Description

technical field [0001] The invention belongs to the field of stability calculation and analysis of power systems, and in particular relates to a method for judging key DC voltage stability based on multi-infeed AC and DC systems. Background technique [0002] With the development of DC transmission technology and the construction of UHV power grids, multiple multi-infeed AC and DC systems have appeared and will continue to appear in my country. While the DC transmission system provides active power for the AC system at the receiving end, the inverter station needs to absorb a large amount of reactive power during the commutation process. During normal operation, the reactive power required by the DC system can be fully provided by the compensation device. However, when the AC system fails, especially during the failure and recovery period of the AC system on the inverter side, the DC transmission system needs to absorb a large amount of reactive power from the AC system, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367Y02E60/00
Inventor 邵瑶汤涌易俊张健王安斯
Owner CHINA ELECTRIC POWER RES INST
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