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Method for realizing microprocessor-based automatic quasi-synchronization function

A technology of automatic quasi-synchronization and implementation method, which is applied in complex mathematical operations, electrical components, circuit devices, etc., and can solve problems such as synchronization point forecast errors

Active Publication Date: 2009-11-04
NARI TECH CO LTD +1
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  • Abstract
  • Description
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Problems solved by technology

[0020] In short, at present, due to the slip angular velocity ω in (1) s and slip angular acceleration a s Affected by the measurement error greatly, resulting in a certain error in the forecast of the same point

Method used

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  • Method for realizing microprocessor-based automatic quasi-synchronization function
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  • Method for realizing microprocessor-based automatic quasi-synchronization function

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Embodiment Construction

[0050]The present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] figure 1 It is a partial block diagram of the microcomputer automatic quasi-synchronization device adopted in the present invention. The voltage on both sides of the circuit breaker is transformed by the voltage transformer, and then input to the analog-to-digital conversion device for A / D conversion after filtering and conditioning circuit. The CPU module of the device controls the frequency of A / D sampling and conversion, and continuously reads in the sampling value of A / D conversion. The CPU device performs measurement and calculation, and performs synchronous judgment after receiving the synchronous closing command from the communication interface or man-machine interface. If conditions permit, the closing command is output through the control exit module.

[0052] The performance of the analog-to-digital conversion device directly affects the measurement...

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Abstract

The invention discloses a method for realizing microprocessor-based automatic quasi-synchronization function, which comprises the following steps: 1) accurately measuring the phase-angle difference of two sides of a breaker at intervals of T0 by a microprocessor-based automatic quasi-synchronization device, and taking the latest phase-angle difference deltai of n points; 2) establishing a quadratic or frequentative polynomial mathematical model of time coordinates for the phase-angle difference of voltages on the two sides of the breaker; 3) according to a phase-angle difference sequence delta, carrying out best square approach on parameters of the mathematical model; and 4) substituting lead time tDL of closing of the breaker into the mathematical model, calculating the closing of the device in the current point, sending a closing pulse if the calculated phase-angle difference of the two sides of the breaker after the tDL is close to zero and does not violate other synchronous closing and locking conditions, and continuing capturing synchronous points if the calculated absolute value of the phase-angle difference is larger than an allowable closing phase angle. The method establishes precise mathematical model by utilizing the change law of the phase-angle difference of the voltages on both sides of the breaker, reduces the influence of the measuring errors on the synchronous closing according to the model, and realizes the accurate prediction for synchronous closing points.

Description

technical field [0001] The invention relates to a microcomputer automatic quasi-synchronization function realization method, which belongs to the technical field of power system automation. Background technique [0002] The synchronous closing operation of circuit breakers is a major operation often performed in power plants and substations. Improper operation will cause a major impact on the power grid and cause serious damage to equipment. At present, the synchronous closing function is mainly completed by a microcomputer automatic quasi-synchronization device or a microcomputer measurement and control device with a quasi-synchronization function (hereinafter collectively referred to as microcomputer automatic quasi-synchronization devices). [0003] At present, the microcomputer automatic quasi-synchronization device generally adopts the synchronous principle of constant advanced time for synchronous closing, that is, the closing signal is sent out at a certain time befor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00G06F17/17
Inventor 周斌张斌闫承志黄国方俞海波沈健张何胡钰林何朝晖
Owner NARI TECH CO LTD
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