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Method of determining generator grid connection synchronous closing pulse transmission time

A determination method and generator technology, applied in the direction of single-network parallel feed arrangement, etc., can solve the problems of reducing the reliability of hardware circuits, inaccurate algorithm results, and the inability to determine the timing of closing pulses well, so as to reduce harmonics. Wave interference, simplification of calculations, exact determination of the effect

Active Publication Date: 2019-11-08
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, hardware calculation adds complex logic circuits to the signal acquisition circuit, which reduces the reliability of the hardware circuit; software calculation generally adopts the method based on discrete Fourier analysis to calculate the amplitude and phase on the basis of the signal acquisition circuit. When the wave interference is serious, the algorithm result is inaccurate
[0004] Therefore, in the case of severe harmonic interference of the terminal voltage of the generator to be connected to the grid, the existing methods cannot well determine the timing of the closing pulse

Method used

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  • Method of determining generator grid connection synchronous closing pulse transmission time
  • Method of determining generator grid connection synchronous closing pulse transmission time
  • Method of determining generator grid connection synchronous closing pulse transmission time

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Embodiment

[0074] see Figure 5 , is a specific method for determining the timing of sending out the synchronous closing pulse of the generator grid-connected in the present invention. This method uses a synchronization device to continuously sample the grid voltage US and the machine terminal voltage UG at the same time, and the sampling rate is not less than 900Hz (not less than 16 points per cycle, the grid frequency is 50Hz, and the product of the two is 900). Using a shift register to store the effective value sequence Urm s , the number of stored points m is not less than 8, and not more than 32 at the same time. Define the program start as Urm s =[Urm s1 , Urms 2 ,...,Urms m ]. The time series is T=[T 1 , T 2 ,...,T m ], the array size of time series T and the effective value sequence size Urm s Consistent, the time series T is an arithmetic sequence, and the difference T between two adjacent elements k+1 -T k =20. When the closing pulse is issued, the linear correlat...

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Abstract

The invention discloses a method of determining generator grid connection synchronous closing pulse transmission time, which comprises steps: S100, grid voltage and generator-end voltage in each cycleare acquired; S200, the effective value of the difference between the grid voltage and the generator-end voltage in each cycle is calculated; S300, the effective values of the voltage differences inmultiple cycles are stored to form a voltage difference effective value sequence, and a time sequence with the values to be consistent with the effective value sequence is stored; S400, according to the voltage difference effective value sequence and the time sequence, the correlation coefficient between the voltage difference effective value sequence and the time sequence is calculated, and a linear fitting expression for the voltage difference effective value sequence and the time sequence is calculated at the same time; and S500, according to the correlation coefficient and the linear fitting expression, whether to transmit closing pulses is judged.

Description

technical field [0001] The invention relates to the technical field of grid-connected synchronous motors, in particular to a method for determining the sending time of a synchronous closing pulse of a generator grid-connected. Background technique [0002] The power supply of modern power systems is generally composed of parallel operation of synchronous motors in power plants distributed in different regions, so as to economically and rationally use different types of energy, including: water energy, wind energy, nuclear energy, coal, natural gas and other natural resources. The interconnection between the synchronous generator and the power grid is completed through the circuit breaker under the control of the synchronizing device, so the safe and reliable operation of the synchronizing device is the prerequisite for the synchronous generator to be connected to the grid. In addition, when two different power grid systems are interconnected through AC, a synchronization dev...

Claims

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Application Information

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IPC IPC(8): H02J3/42
CPCH02J3/42
Inventor 张飞宫奎吕滔江献玉杨金香邓磊赵博
Owner STATE GRID CORP OF CHINA
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