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AC/DC system commutation voltage prediction method based on second-order circuit response

A technology of AC and DC systems and second-order circuits, applied in the direction of power transmission AC networks, etc., can solve problems such as large-scale power outages, AC system voltage, current fluctuations, and DC blocking

Active Publication Date: 2019-11-29
LIYANG RES INST OF SOUTHEAST UNIV +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commutation failure will lead to a rapid drop in DC transmission power, causing fluctuations in AC system voltage and current
In severe cases, it will cause continuous and successive commutation failures, resulting in DC blocking and even large-scale power outages

Method used

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  • AC/DC system commutation voltage prediction method based on second-order circuit response
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  • AC/DC system commutation voltage prediction method based on second-order circuit response

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Embodiment Construction

[0053] Such as figure 1 As shown, a second-order circuit response-based method for predicting the commutation voltage of an AC / DC system provided by an embodiment of the present invention includes:

[0054] Step S1: Based on the second-order circuit response form, a prediction model for the transient response of the AC-DC system is established;

[0055] Step S2: Collect the three-phase voltage data of the converter bus;

[0056] Step S3: Calculate the Fourier expansion coefficients of the three-sequence components of the converter bus voltage;

[0057] Step S4: based on the principle of the least square method, fitting the parameters in the response prediction model;

[0058] Step S5: Predict the three-phase components of the commutation voltage.

[0059] This embodiment takes the CIGRE HVDC benchmark model as an example for analysis, and its model structure is as follows figure 2 shown. The test system is built in PSCAD / EMTDC, the DC side voltage is 500kV, and the DC capa...

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Abstract

The invention provides an AC / DC system commutation voltage prediction method based on second-order circuit response for an AC / DC interconnection system. The method comprises the following steps of: firstly, establishing a prediction model of AC-DC system transient response based on a response form of a second-order circuit; decomposing the three-phase component of a converter bus voltage accordingto a symmetrical component method to obtain a Fourier expansion coefficient of the three-sequence component of the converter bus voltage; and finally, fitting each parameter in the response prediction model based on a least square method principle, and calculating a predicted value of the commutation voltage. The method can quickly predict the voltage of each phase of the converter bus after a system fault, facilitates timely making and taking of emergency control measures, and is of great significance to the maintenance of the stable operation of the power system.

Description

technical field [0001] The invention relates to the technical field of power system situation awareness and trend prediction, in particular to a method for predicting commutation voltage of an AC / DC system based on a second-order circuit response. Background technique [0002] my country has a vast territory but the energy distribution is very uneven. The energy-rich western region is far away from the eastern load center, requiring long-distance transmission of electric energy. HVDC transmission system is widely used for long-distance power transmission because of its strong controllability, large transmission capacity, and low transmission loss. [0003] Commutation failure has always been one of the most common faults in HVDC transmission systems. Commutation failure will lead to a rapid drop in DC transmission power, causing fluctuations in the voltage and current of the AC system. In severe cases, it will cause continuous and successive commutation failures, resultin...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 汤奕张超明
Owner LIYANG RES INST OF SOUTHEAST UNIV
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