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

A technology of AC and DC systems and prediction methods, which is applied in the field of commutation voltage prediction of AC and DC systems based on first-order circuit responses, and can solve problems such as AC system voltage and current fluctuations, large-scale power outages, and DC transmission power drops

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

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Problems solved by technology

Commutation failure will lead to a rapid drop in DC transmission power, causing fluctuations in AC system voltage and current
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  • AC/DC system commutation voltage prediction method based on first-order circuit response
  • AC/DC system commutation voltage prediction method based on first-order circuit response
  • AC/DC system commutation voltage prediction method based on first-order circuit response

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Embodiment Construction

[0056] Such as figure 1 As shown, the embodiment of the present invention provides a method for predicting the commutation voltage of an AC / DC system based on a first-order circuit response, including:

[0057] Step S1: Based on the first-order circuit response form, a prediction model for the transient response of the AC-DC system is established;

[0058] Step S2: Collect the three-phase voltage data of the converter bus;

[0059] Step S3: Calculate the Fourier expansion coefficients of the three-sequence components of the converter bus voltage;

[0060] Step S4: based on the principle of the least square method, fitting the parameters in the response prediction model;

[0061] Step S5: Predict the three-phase components of the commutation voltage.

[0062] 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 c...

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Abstract

The invention provides an AC/DC system commutation voltage prediction method based on first-order circuit response for an AC/DC interconnection system. The method comprises the following steps: firstly, establishing a prediction model of AC-DC system transient response based on a response form of a first-order circuit; decomposing the three-phase component of the converter bus voltage according toa 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 the timely making and taking of emergency control measures, and is of great significance to the maintenance of the stable operation of a 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 first-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, resulting...

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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