CN104076703A - Switch turn-on controller - Google Patents
Switch turn-on controller Download PDFInfo
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- CN104076703A CN104076703A CN201410297328.4A CN201410297328A CN104076703A CN 104076703 A CN104076703 A CN 104076703A CN 201410297328 A CN201410297328 A CN 201410297328A CN 104076703 A CN104076703 A CN 104076703A
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Abstract
The invention discloses a switch turn-on controller, and relates to the technical field of electrical control. The switch turn-on controller comprises a first shaping module and a second shaping module, wherein the first shaping module is used for receiving the sine wave voltage of an electric generator and conducting shaping on the sine wave voltage, and the second shaping module is used for receiving the sine wave voltage of a power grid and conducting shaping on the sine wave voltage. Square signals outputted by the first shaping module and the second shaping module respectively pass through a phase-sensitive module and are then inputted to a low-pass filtering module. The low-pass filtering module outputs triangular wave signals to a proportional differential module and a leading phase angle level detection module respectively. The output end of the proportional differential module is connected with the input end of a leading time level detection module. A logic module serves as an output module. The two input ends of the logic module receive a signal outputted by the leading time level detection module and a signal outputted by the leading phase angle level detection module respectively. The switch turn-on controller solves the problem that an on-off controller in a quasi-synchronization automatic grid connection device can not be automatically locked when the frequency difference is large, and a wrong instruction is easily sent.
Description
Technical field
The present invention relates to Electrical Control Technology field, especially a kind of switch switching-on controller for the grid-connected automatic sub-synchronous device in power station.
Background technology
Generator quasi-synchronization paralleling is the regular job frequently of one of generating plant, in the moment of generator input coefficient paired running, is often accompanied by rush of current and power rush, and can cause arranged side by side the instantaneous decline of line voltage.If operating mistake, dash 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 power grid accident.Traditional phase error hand-manipulated is larger, and traditional accurate same period of the auto-parallel device precision based on mimic channel is also not high enough, and self-regulating process is slower.And switch switching-on controller is an important component part in automatic sub-synchronous device, its effect is how to judge the synchronous situation of generator and system, in the time that frequency difference and voltage difference all meet the demands, certain hour sends reclosing command in advance, and we do not wish in the time that frequency difference is larger grid-connected.On-off controller in more existing automatic sub-synchronous devices can not be accomplished automatic blocking in the time that frequency difference is larger, easily sends wrong instruction.
Summary of the invention
The object of this invention is to provide a kind of switch switching-on controller, it can solve on-off controller in accurate same period of auto-parallel device can not automatic blocking in the time that frequency difference is larger, easily sends the problem of false command.
In order to address the above problem, the technical solution used in the present invention is: this 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 terminal of described proportion differential module is connected with the input end of leading time level detection module, logic module is as output module, and two input end receives respectively the signal of described leading time level detection module and the output of described leading angle level detection module.
In technique scheme, scheme can also be more specifically: described leading angle level detection module and described leading time level detection module form by differential type schmidt trigger circuit.
Owing to having adopted technique scheme, compared with prior art, the beneficial effect having is in the present invention: 1, phase sensitivity module can be differentiated modulating signal phase, thereby differentiates the direction that measured signal changes, phase sensitivity module also has the ability of frequency-selecting simultaneously, thereby improves the anti-dry ability of system.
2, in leading time level detection module and leading angle level detection module, adopted differential type schmidt trigger circuit, so input impedance is high, quick action, operating point is stable, and temperature performance is good.
3,, in the time that voltage difference exceedes setting valve, closing circuit locking, can not send false command.
Brief description of the drawings
Fig. 1 is block diagram of the present invention.
Fig. 2 is logic block schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Switch switching-on controller shown in Fig. 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 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 terminal of proportion differential module 1-5 is connected with the input end of leading time level detection module 1-6, logic module 1-8 is as output module, and two input end receives respectively the signal of leading time level detection module 1-6 and leading angle level detection module 1-7 output.Leading angle level detection module 1-7 in the present embodiment and leading time level detection module 1-6 form by differential type schmidt trigger circuit.
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 maximal value, 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 higher hamonic wave.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 2, 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 trigger flip-flop 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.
Claims (2)
1. a switch switching-on controller, is characterized in that: comprise 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 terminal of described proportion differential module (1-5) is connected with the input end of leading time level detection module (1-6), logic module (1-8) is as output module, and two input end receives respectively the signal of described leading time level detection module (1-6) and described leading angle level detection module (1-7) output.
2. switch switching-on controller according to claim 1, is characterized in that: described leading angle level detection module (1-7) and described leading time level detection module (1-6) form by differential type schmidt trigger circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410297328.4A CN104076703A (en) | 2014-06-28 | 2014-06-28 | Switch turn-on controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410297328.4A CN104076703A (en) | 2014-06-28 | 2014-06-28 | Switch turn-on controller |
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| CN104076703A true CN104076703A (en) | 2014-10-01 |
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| CN201410297328.4A Pending CN104076703A (en) | 2014-06-28 | 2014-06-28 | Switch turn-on controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113785A (en) * | 2021-11-17 | 2022-03-01 | 广西电网有限责任公司贵港供电局 | Circuit closes ring detection device |
Citations (5)
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| CN85201042U (en) * | 1985-04-01 | 1986-06-11 | 浙江省机械科学研究所 | Constant leading time type quasi-synchronizer |
| 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 |
| US20100320842A1 (en) * | 2009-06-18 | 2010-12-23 | Adensis Gmbh | Startup source inverter |
| CN202004474U (en) * | 2011-04-29 | 2011-10-05 | 天津明硕机电设备有限公司 | Microcomputer automatic quasi-synchronizing device |
| JP2011211845A (en) * | 2010-03-30 | 2011-10-20 | Mitsubishi Electric Corp | Synchronism testing system of generator |
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2014
- 2014-06-28 CN CN201410297328.4A patent/CN104076703A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85201042U (en) * | 1985-04-01 | 1986-06-11 | 浙江省机械科学研究所 | Constant leading time type quasi-synchronizer |
| 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 |
| US20100320842A1 (en) * | 2009-06-18 | 2010-12-23 | Adensis Gmbh | Startup source inverter |
| JP2011211845A (en) * | 2010-03-30 | 2011-10-20 | Mitsubishi Electric Corp | Synchronism testing system of generator |
| CN202004474U (en) * | 2011-04-29 | 2011-10-05 | 天津明硕机电设备有限公司 | Microcomputer automatic quasi-synchronizing device |
Non-Patent Citations (1)
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| 肖培榕 等: "ZZQ_5型自动准同期装置", 《继电器》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113785A (en) * | 2021-11-17 | 2022-03-01 | 广西电网有限责任公司贵港供电局 | Circuit closes ring detection device |
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Application publication date: 20141001 |