CN104037811A - Automatic quasi-synchronizing device - Google Patents
Automatic quasi-synchronizing device Download PDFInfo
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- CN104037811A CN104037811A CN201410297326.5A CN201410297326A CN104037811A CN 104037811 A CN104037811 A CN 104037811A CN 201410297326 A CN201410297326 A CN 201410297326A CN 104037811 A CN104037811 A CN 104037811A
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Abstract
The invention discloses an automatic quasi-synchronizing device and relates to the technical field of electrical control. The automatic quasi-synchronizing device comprises a central processing chip and a switch switch-on controller, wherein a frequency modulation controller and a pressure regulating controller are both connected with the central processing chip. The problems that a traditional quasi-synchronizing grid-connection device is low in accuracy and the automatic adjustment process is slow can be solved by the device.
Description
Technical field
The present invention relates to Electrical Control Technology field, especially a kind of automatic sub-synchronous device for the grid-connected automatic sub-synchronous device in hydroelectric station.
Background technology
Generator quasi-synchronization paralleling is the regular job frequently of one, power plant, in the moment of generator input coefficient paired running, is often accompanied by rush of current and power rush, and can cause that dot system voltage transient arranged side by side declines.If operating mistake, impulse current is excessive, and the spiral that may make the macro-axis distortion of unit and cause generator is out of shape, tears, insulation damages, and serious non-synchronization paralleling can cause unit and systematic failures.Traditional phase error hand-manipulated is large, and the traditional accurate simultaneous interconnecting device precision based on analog circuit is also not high enough, and self-regulating process is slow.
Summary of the invention
The object of this invention is to provide a kind of automatic sub-synchronous device, it is also not high enough that it can solve traditional accurate simultaneous interconnecting device precision, the problem that self-regulating process is slow.
In order to address the above problem, the technical solution used in the present invention is: this automatic sub-synchronous device, comprises central processing element; Switch switching-on controller, frequency modulation control device is all connected with described central processing element with voltage regulator controllers;
Described switch switching-on controller, comprises the first Shaping Module for receiving generator sine voltage and this sine voltage being carried out to shaping; For the second Shaping Module that receives electrical network sine voltage and this sine voltage is carried out to shaping; The square-wave signal that described the first Shaping Module and described the second Shaping Module are exported is respectively input to low-pass filtering module after phase sensitivity module, and this low-pass filtering module is respectively to proportion differential module and leading angle level detection module output triangular signal; The output of described proportion differential module is connected with the input of leading time level detection module, logic module is as output module, and two input receives respectively the signal of described leading time level detection module and the output of described leading angle level detection module;
Described frequency modulation control device, comprises the first shaping pulse module for receiving generator square wave; For the second shaping pulse module of receiving system square wave; For receiving the second electrical level detection module of triangular wave; Described system square wave be input to simultaneously the 3rd with an input of door, the 3rd receives the output signal of described the first shaping pulse module with another input of door; Described generator square wave be input to simultaneously the 4th with an input of door, the 4th receives the output signal of described the second shaping pulse module with another input of door; The output signal of described second electrical level detection module is transported to pulse shaping module; The described the 3rd is transported to respectively the second bistable state trigger module with door and the 4th with the output signal of door, the output signal of described pulse shaping module be transported to respectively the 5th with door and the 6th with an input of door, the described the 5th with door and the 6th and another input receive respectively the output signal of described the second bistable state trigger module; The described the 5th removes to control deceleration relay with the output signal of door after the first pulse stretching module, and the described the 6th removes to control speedup relay with the output signal of door after the second pulse stretching module;
Described voltage regulator controllers, comprises the first rectification filtering module and the second rectification filtering module that are connected with two secondary winding of generator voltage instrument transformer respectively; The 3rd rectification filtering module and the 4th rectification filtering module that are connected with two secondary winding of system voltage instrument transformer respectively;
One end of the output of described the first rectification filtering module is connected with one end of described the 4th rectification filtering module output, and the other end of the output of described the first rectification filtering module is connected with one end of the input of the 3rd level detection module; Output one end of described the second rectification filtering module is connected with the other end of the input of described the 3rd level detection module, the other end of the output of described the second rectification filtering module and described the 3rd rectification filtering module) one end of output is connected, and the other end of described the 3rd rectification filtering module output is connected with the other end of described the 4th rectification filtering module output;
Output one end of described the 3rd level detection module is connected with one end of door input with the 7th, and the output other end of described the 3rd level detection module is connected with one end of door input with the 8th; One end of time module is connected with the other end of door input with the described the 7th, and the other end of described time module is connected with the other end of door input with the described the 8th; The described the 7th is connected with turndown relay with gate output terminal, and the described the 8th is connected with booster relay with gate output terminal.
In technique scheme, scheme can also be more specifically: described leading angle level detection module, and leading time level detection module, second electrical level detection module is by forming by differential type Schmidt trigger circuit with the 3rd level detection module.
Owing to having adopted technique scheme, compared with prior art, the beneficial effect having is in the present invention: the relatively height of generator and system voltage, if voltage difference, not in the scope requiring, is sent pressure regulation instruction again, acts on voltage adjuster; Can coordinate well with voltage adjuster, in the time of needs fine tuning, there will not be toning; Unlocking in the time that voltage difference meets the demands, the part that allows to close a floodgate is sent reclosing command.
Brief description of the drawings
Fig. 1 is block diagram of the present invention.
Fig. 2 is the block diagram of switch switching-on controller.
Fig. 3 is the block diagram of frequency modulation control device.
Fig. 4 is the block diagram of voltage regulator controllers.
Fig. 5 is the logic block schematic diagram of switch switching-on controller.
Fig. 6 is the phase diagram between generator and system voltage.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Automatic sub-synchronous device shown in Fig. 1, comprises central processing element 4; Switch switching-on controller 1, frequency modulation control device 2 is all connected with described central processing element 4 with voltage regulator controllers 3;
Switch switching-on controller 1, Fig. 2, comprises the first Shaping Module 1-1 for receiving generator sine voltage and this sine voltage being carried out to shaping; For the second Shaping Module 1-2 that receives electrical network sine voltage and this sine voltage is carried out to shaping; The square-wave signal that the first Shaping Module 1-1 and the second Shaping Module 1-2 export is respectively input to low-pass filtering module 1-4 after phase sensitivity module 1-3, and this low-pass filtering module is respectively to proportion differential module 1-5 and leading angle level detection module 1-7 output triangular signal; The output of proportion differential module 1-5 is connected with the input of leading time level detection module 1-6, logic module 1-8 is as output module, and two input receives respectively the signal of leading time level detection module 1-6 and leading angle level detection module 1-7 output;
Frequency modulation control device, Fig. 3, comprises the first shaping pulse module 2-1 for receiving generator square wave; For the second shaping pulse module 2-2 of receiving system square wave; For receiving the second electrical level detection module 2-3 of triangular wave; System square wave be input to simultaneously the 3rd with an input of door 2-4, the 3rd receives the output signal of the first shaping pulse module 2-1 with another input of door; Generator square wave be input to simultaneously the 4th with an input of door 2-5, the 4th receives the output signal of the second shaping pulse module 2-2 with another input of door; The output signal of second electrical level detection module 2-3 is transported to pulse shaping module 2-6; The 3rd is transported to respectively the second bistable state trigger module 2-7 with door 2-4 and the 4th with the output signal of door 2-5, the output signal of pulse shaping module 2-6 be transported to respectively the 5th with door 2-8 and the 6th with an input of door 2-9, the 5th receives respectively the output signal of the second bistable state trigger module 2-7 with door 2-8 and the 6th with another input of door 2-9; The 5th removes to control deceleration relay 3J with the output signal of door 2-8 after the first pulse stretching module 2-10, and the 6th removes to control speedup relay 2J with the output signal of door 2-9 after the second pulse stretching module 2-11;
Voltage regulator controllers, Fig. 4, comprises the first rectification filtering module 3-1 and the second rectification filtering module 3-2 that are connected with two secondary winding of generator voltage instrument transformer respectively; The 3rd rectification filtering module 3-3 and the 4th rectification filtering module 3-4 that are connected with two secondary winding of system voltage instrument transformer respectively;
One end of the output of the first rectification filtering module 3-1 is connected with one end of the 4th rectification filtering module 3-4 output, and the other end of the output of the first rectification filtering module 3-1 is connected with one end of the input of the 3rd level detection module 3-5; Output one end of the second rectification filtering module 3-2 is connected with the other end of the input of the 3rd level detection module 3-5, the other end of the output of the second rectification filtering module 3-2 is connected with one end of the 3rd rectification filtering module 3-3 output, and the other end of the 3rd rectification filtering module 3-3 output is connected with the other end of the 4th rectification filtering module 3-4 output;
Output one end of the 3rd level detection module 3-5 is connected with one end of door 3-6 input with the 7th, and the output other end of the 3rd level detection module 3-5 is connected with one end of door 3-7 input with the 8th; One end of time module 3-8 is connected with the other end of door 3-6 input with the 7th, and the other end of time module 3-8 is connected with the other end of door 3-7 input with the 8th; The 7th is connected with turndown relay 5J with door 3-6 output, and the 8th is connected with booster relay 4J with door 3-7 output.
In the present embodiment, leading angle level detection module 1-7, leading time level detection module 1-6, second electrical level detection module is made up of by differential type Schmidt trigger circuit 2-3 and the 3rd level detection module 3-5.
For making synchronous generator and system arranged side by side by accurate synchronizing mode, must meet three conditions below:
1, the difference on the frequency of generator voltage and system voltage should be less than permissible value;
2, the difference in magnitude of generator voltage and system voltage should be less than permissible value;
3, in the moment of circuit breaker main contact closure arranged side by side, the phase difference of generator voltage and system voltage should be less than permissible value.
For realization condition 1, this device is provided with frequency modulation control device, can realize the frequency of generator to system frequency automatic tracing; For realization condition 2, this device is provided with voltage regulator controllers, can realize the automatic tracing of generator voltage to system voltage; For satisfying condition 3, this device is provided with switch switching-on controller, in this controller, be provided with the control module of constant leading time, the setting value of leading time can be adjusted according to the length of breaker closing time arranged side by side, in the time that the setting value of leading time equates with the closing time of circuit breaker (including the operate time of all auxiliary elements), device just can ensure the moment of circuit breaker main contact closure, and the generator voltage being put into and the phase difference of system voltage are less than permissible value.
In order accurately to reflect the phase relation of generator voltage Uf and system voltage Ux, obtain a triangular wave by shaping, detection, filtering.In the time of Uf and Ux phase coincidence, triangular wave reaches maximum, and in the time that Uf spends with Ux phase phasic difference 180, triangular wave reaches minimum value.From 0 degree to 180 degree, 180 degree are linear to the variation of 360 degree triangular waves, and its amplitude is with Uf, the variation of Ux and changing.
The sine wave of generator and system is respectively by being shaped as respectively square wave after the first Shaping Module 1-1 and the second Shaping Module 1-2, square wave is after phase sensitivity module 1-3 detection, just can obtain a series of with Uf, Ux phase change and the square wave that changes, this serial square wave just must a triangular wave after the low-pass filtering module 1-4 of two economize on electricity senses-electric capacity composition filters high order harmonic component.By by resistance, proportion differential module 1-5 and the leading time level detection module 1-6 of electric capacity composition, can obtain a constant leading time, and this leading time does not change with frequency difference; By leading angle level detection module, 1-7 can obtain a constant leading angle, logic block schematic diagram as shown in Figure 5, in the time that frequency difference is larger, the one state output of leading time level detection module 1-6 is prior to the one state output of leading angle level detection module 1-7, the 1st can not meet with a door 1-8 condition, and the first flip and flop generator 1-9 does not overturn, the 2nd with a door 1-10 be still " 0 " state, closing circuit locking, does not send reclosing command.
Less in frequency difference, when satisfied combined floodgate requires, the one state output of leading angle level detection module 1-7 is prior to the one state output of leading time level detection module 1-6, the 1st meets with two conditions of door 1-8, the 2nd is output as one state with door 1-10, prepare condition for closing a floodgate, in the time that leading time level detection module is output as one state, just sent reclosing command.Just dropped in 1 second at device, the 1st with door 1-8 and the 2nd with door 1-10 all in " 0 " state, closing circuit locking, does not send reclosing command in 1 second that has ensured just to have dropped at device.
Phase relation between generator and system can be found out by Fig. 6, and after phase coincidence, in the interval of 180 degree, if generator is very fast, it should super previous angle to system, if generator is slower, it is to the system angle that should lag behind.Just in time contrary to the above to their phase relation in 360 degree intervals at 180 degree.
Therefore, we are less than in the interval of 180 degree being greater than 0 degree, as long as determine generator and these two voltages of system, which is leading, just can determine generator and system speed who who is slow soon.
Generator and system voltage, after shaping, are transformed to square wave by sine wave, and when square wave is when " 0 " becomes " 1 ", the first shaping pulse module 2-1 and the second shaping pulse module 2-2 export respectively a positive pulse; The electric voltage frequency ff that supposes generator is less than system voltage frequency f x, and at 0 degree, in 180 degree intervals, when system square wave is when " 0 " state becomes one state, generator square wave is " 0 ", therefore the second shaping pulse module 2-2 exports a series of positive pulses; And generator square wave is when " 0 " state becomes one state, system square wave is one state, and the first shaping pulse module 2-1 does not export.At 180 degree, in 360 degree intervals, situation is just in time contrary, and the first shaping pulse module 2-1 exports a series of positive pulses, and the second shaping pulse module 2-2 does not export; When phase coincidence, triangular wave is in peak value, after second electrical level detection module 2-3, export zero signal by pulse shaping module 2-4, together with zero signal of exporting with the second bistable state trigger module 2-5, remove to drive the second pulse stretching module 2-11, make speedup relay 2J action, send speedup instruction.Otherwise, by the signal of pulse shaping module 2-4 output, remove to drive the first pulse stretching module 2-10 with together with the signal of the second bistable state trigger module 2-5 output, make deceleration relay 3J action, send deceleration instruction.
Two windings of generator voltage Uf, two windings of system voltage Uc, after rectification, filtering, subtract each other, one group is Uf-Uc, and one group is Uc-Uf, these two voltage differences compare with the voltage difference of adjusting, if generator voltage is higher than system voltage, and voltage difference is while being greater than setting value, sends step-down instruction, send voltage difference blocking order simultaneously, closing circuit cannot be closed a floodgate.If generator voltage, lower than system voltage, sends the instruction of boosting, send voltage difference blocking order simultaneously.If the voltage difference of generator and system is less than setting value, send and remove voltage difference blocking order, allow to close a floodgate.
Claims (2)
1. an automatic sub-synchronous device, is characterized in that: comprise central processing element (4); Switch switching-on controller (1), frequency modulation control device (2) is all connected with described central processing element (4) with voltage regulator controllers (3);
Described switch switching-on controller (1), comprises the first Shaping Module (1-1) for receiving generator sine voltage and this sine voltage being carried out to shaping; For the second Shaping Module (1-2) that receives electrical network sine voltage and this sine voltage is carried out to shaping; The square-wave signal that described the first Shaping Module (1-1) and described the second Shaping Module (1-2) are exported is respectively input to low-pass filtering module (1-4) after phase sensitivity module (1-3), and this low-pass filtering module is respectively to proportion differential module (1-5) and leading angle level detection module (1-7) output triangular signal; The output of described proportion differential module (1-5) is connected with the input of leading time level detection module (1-6), logic module (1-8) is as output module, and two input receives respectively the signal of described leading time level detection module (1-6) and described leading angle level detection module (1-7) output;
Described frequency modulation control device, comprises the first shaping pulse module (2-1) for receiving generator square wave; For the second shaping pulse module (2-2) of receiving system square wave; For receiving the second electrical level detection module (2-3) of triangular wave; Described system square wave be input to simultaneously the 3rd with an input of door (2-4), the 3rd receives the output signal of described the first shaping pulse module (2-1) with another input of door; Described generator square wave be input to simultaneously the 4th with an input of door (2-5), the 4th receives the output signal of described the second shaping pulse module (2-2) with another input of door; The output signal of described second electrical level detection module (2-3) is transported to pulse shaping module (2-6); The described the 3rd is transported to respectively the second bistable state trigger module (2-7) with door (2-4) and the 4th with the output signal of door (2-5), the output signal of described pulse shaping module (2-6) be transported to respectively the 5th with door (2-8) and the 6th with an input of door (2-9), the described the 5th with door (2-8) and the 6th and another input of (2-9) receive respectively the output signal of described the second bistable state trigger module (2-7); The described the 5th removes to control deceleration relay (3J) with the output signal of door (2-8) after the first pulse stretching module (2-10), and the described the 6th removes to control speedup relay (2J) with the output signal of door (2-9) after the second pulse stretching module (2-11);
Described voltage regulator controllers, comprises the first rectification filtering module (3-1) and the second rectification filtering module (3-2) that are connected with two secondary winding of generator voltage instrument transformer respectively; The 3rd rectification filtering module (3-3) being connected with two secondary winding of system voltage instrument transformer respectively and the 4th rectification filtering module (3-4);
One end of the output of described the first rectification filtering module (3-1) is connected with one end of described the 4th rectification filtering module (3-4) output, and the other end of the output of described the first rectification filtering module (3-1) is connected with one end of the input of the 3rd level detection module (3-5); Output one end of described the second rectification filtering module (3-2) is connected with the other end of the input of described level detection module (3-5), the other end of the output of described the second rectification filtering module (3-2) is connected with one end of described the 3rd rectification filtering module (3-3) output, and the other end of described the 3rd rectification filtering module (3-3) output is connected with the other end of described the 4th rectification filtering module (3-4) output;
Output one end of described the 3rd level detection module (3-5) is connected with one end of door (3-6) input with the 7th, and the output other end of described the 3rd level detection module (3-5) is connected with one end of door (3-7) input with the 8th; One end of time module (3-8) is connected with the other end of door (3-6) input with the described the 7th, and the other end of described time module (3-8) is connected with the other end of door (3-7) input with the described the 8th; The described the 7th is connected with turndown relay (5J) with door (3-6) output, and the described the 8th is connected with booster relay (4J) with door (3-7) output.
2. automatic sub-synchronous device according to claim 1, it is characterized in that: described leading angle level detection module (1-7), leading time level detection module (1-6), second electrical level detection module is made up of by differential type Schmidt trigger circuit (2-3) and the 3rd level detection module (3-5).
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| CN201410297326.5A CN104037811A (en) | 2014-06-28 | 2014-06-28 | Automatic quasi-synchronizing device |
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| CN201410297326.5A CN104037811A (en) | 2014-06-28 | 2014-06-28 | Automatic quasi-synchronizing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612038A (en) * | 2017-10-31 | 2018-01-19 | 福建省广通电控有限公司 | A kind of generator auto-parallel system |
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| JPH06269129A (en) * | 1993-03-15 | 1994-09-22 | Mitsubishi Heavy Ind Ltd | Parallel control apparatus of electric power system |
| CN1808830A (en) * | 2005-12-26 | 2006-07-26 | 西安理工大学 | Digital automatic quasi-synchronous control device and method for synchronous generator |
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2014
- 2014-06-28 CN CN201410297326.5A patent/CN104037811A/en active Pending
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| JPH06269129A (en) * | 1993-03-15 | 1994-09-22 | Mitsubishi Heavy Ind Ltd | Parallel control apparatus of electric power system |
| CN1808830A (en) * | 2005-12-26 | 2006-07-26 | 西安理工大学 | Digital automatic quasi-synchronous control device and method for synchronous generator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612038A (en) * | 2017-10-31 | 2018-01-19 | 福建省广通电控有限公司 | A kind of generator auto-parallel system |
| CN107612038B (en) * | 2017-10-31 | 2021-02-09 | 福建省广通电控有限公司 | Automatic grid-connected system of generator |
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Application publication date: 20140910 |