CN112290599A - Power generation grid-connected nuclear phase protection device and use method thereof - Google Patents
Power generation grid-connected nuclear phase protection device and use method thereof Download PDFInfo
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- CN112290599A CN112290599A CN202011079020.4A CN202011079020A CN112290599A CN 112290599 A CN112290599 A CN 112290599A CN 202011079020 A CN202011079020 A CN 202011079020A CN 112290599 A CN112290599 A CN 112290599A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
Abstract
The invention relates to a power generation grid-connected nuclear phase protection device which comprises a first voltage detection module, a second voltage detection module, a third voltage detection module and a time detection module, wherein the first voltage detection module, the second voltage detection module and the third voltage detection module are respectively connected with secondary output connection terminals of a phase A, a phase B and a phase C voltage sensor of a power grid side bus and a secondary output connection terminal of a phase A, a phase B and a phase C voltage sensor of a generator bus; whether the three voltage detection modules are in phase or not is judged, and the time detection modules are triggered to work when the three voltage detection modules are in phase. The invention utilizes the differential pressure detection and logic judgment time delay part to give an interlocking protection signal whether the grid-connected switch can be safely switched on, solves the problems of non-intuitive, unsafe and inconvenient phase judgment by utilizing manual phase checking when the generator is connected to the grid, and avoids major electrical accidents caused by misoperation of switching on.
Description
Technical Field
The invention relates to the technical field of power generation grid connection, in particular to a power generation grid connection nuclear phase protection device and a using method thereof.
Background
The phase checking is necessary before the grid connection of the power system, so that the power supply circuit is intact and the grid connection switch is switched on safely. At present, manual phase checking is often adopted, the behavior of judging the phase is unsafe and inconvenient, and the problems of electric shock, judgment error and the like can occur. For example, in the conventional patent publication CN108196139A, two sets of pointer-type phase detectors are used, and when the two sets of pointer-type phase detectors are used, they are respectively connected to different phases for observation, and it is necessary to confirm whether the fluctuations of the two sets of pointer-type phase detectors are consistent during observation, which is very inconvenient and prone to error during use.
Disclosure of Invention
The invention provides a power generation grid-connected nuclear phase protection device and a using method thereof, which can effectively avoid serious electrical accidents caused by manual nuclear phase errors and misoperation closing and can ensure that grid-connected operation is more convenient and safer.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a power generation grid-connected nuclear phase protection device, which comprises a first voltage detection module, a second voltage detection module, a third voltage detection module and a time detection module, wherein the first voltage detection module comprises a first voltage judgment unit and a first contact switch; the second voltage detection module comprises a second voltage judgment unit and a second contact switch; the third voltage detection module comprises a third voltage judgment unit and a third contact switch; the time detection module comprises a delay unit and an auxiliary contact switch; one end of the first voltage judgment unit is connected with a secondary output connecting terminal of a first phase voltage sensor of a power grid side bus, and the other end of the first voltage judgment unit is connected with a secondary output connecting terminal of a first phase voltage sensor of a generator bus; one end of the second voltage judging unit is connected with a secondary output connecting terminal of the second-phase voltage sensor of the power grid side bus, and the other end of the second voltage judging unit is connected with a secondary output connecting terminal of the second-phase voltage sensor of the generator bus; one end of the third voltage judging unit is connected with a secondary output connecting terminal of a third phase voltage sensor of a power grid side bus, and the other end of the third voltage judging unit is connected with a secondary output connecting terminal of a third phase voltage sensor of a generator bus; one end of the first contact switch is connected with one end of a direct-current power supply, the other end of the first contact switch is connected with one end of the second contact switch, the other end of the second contact switch is connected with one end of the third contact switch, the other end of the third contact switch is connected with one end of a time delay unit, and the other end of the time delay unit is connected with the other end of the direct-current power supply; two ends of the auxiliary contact switch are connected with the interlocking control end of the grid-connected switch; the first contact switch, the second contact switch, the third contact switch and the auxiliary contact switch are respectively controlled by a first voltage judging unit, a second voltage judging unit, a third voltage judging unit and a time delay unit.
And the two ends of the first voltage judgment unit are also connected with a first display unit in parallel, and the first display unit is used for displaying the pressure difference between the secondary output phase of the first phase voltage sensor of the power grid side bus and the secondary output phase of the first phase voltage sensor of the generator bus.
And two ends of the second voltage judgment unit are also connected with a second display unit in parallel, and the second display unit is used for displaying the pressure difference between the secondary output phase of the second-phase voltage sensor of the power grid side bus and the secondary output phase of the second-phase voltage sensor of the generator bus.
And the two ends of the third voltage judgment unit are also connected with a third display unit in parallel, and the third display unit is used for displaying the pressure difference between the secondary output phase of the third phase voltage sensor of the power grid side bus and the secondary output phase of the third phase voltage sensor of the generator bus.
The first voltage detection module, the second voltage detection module and the third voltage detection module are three groups of independent voltage detection modules, and are used for carrying out phase-phase differential pressure in-phase detection on a power grid side bus and a generator bus of a three-phase grid-connected switch to serve as grid-connected safety judgment.
The technical scheme adopted by the invention for solving the technical problems is as follows: the application method of the power generation grid-connected nuclear phase protection device comprises the following steps:
(1) voltage signals output by the power grid side high-voltage sensor and the power generation side high-voltage sensor are introduced into the power generation grid-connected nuclear phase protection device, so that a secondary output phase of a first phase voltage sensor of a power grid side bus, a secondary output phase of a second phase voltage sensor of the power grid side bus and a secondary output phase of a third phase voltage sensor of the power grid side bus are respectively connected with one end of a first voltage judgment unit, one end of a second voltage judgment unit and one end of a third voltage judgment unit; the secondary output phase of the first phase voltage sensor of the generator bus, the secondary output phase of the second phase voltage sensor of the generator bus and the secondary output phase of the third phase voltage sensor of the generator bus are respectively connected with the other end of the first voltage judgment unit, and the other end of the second voltage judgment unit is connected with the other end of the third voltage judgment unit;
(2) the first voltage judgment unit judges the pressure difference between the secondary output phase of the first phase voltage sensor of the power grid side bus and the secondary output phase of the first phase voltage sensor of the generator bus; the second voltage judgment unit judges the pressure difference between the secondary output phase of the second-phase voltage sensor of the power grid side bus and the secondary output phase of the second-phase voltage sensor of the generator bus; the third voltage judgment unit judges the pressure difference between the secondary output phase of the third phase voltage sensor of the power grid side bus and the secondary output phase of the third phase voltage sensor of the generator bus; when the judgment result of the first voltage judgment unit is smaller than the preset voltage, the first contact switch is automatically closed, otherwise, the first contact switch is opened; when the judgment result of the second voltage judgment unit is smaller than the preset voltage, the second contact switch is automatically closed, otherwise, the second contact switch is opened; when the judgment result of the third voltage judgment unit is less than the preset voltage, the third contact switch is automatically closed, otherwise, the third contact switch is opened; when the first contact switch, the second contact switch and the third contact switch are automatically closed, the condition of grid connection is met, and at the moment, the time delay unit controls the auxiliary contact to be closed after delaying preset time, and an interlocking signal allowing the grid connection switch to be closed is given to an interlocking control end of the grid connection switch.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: the invention utilizes the differential pressure detection and logic to judge the time delay part and provides the interlocking protection signal whether the grid-connected switch can be safely switched on, thereby effectively avoiding the serious electrical accident caused by manual phase checking error and misoperation switching on, leading the grid-connected operation to be more convenient and safer, and leading the phase checking to be more intuitive when the phase is judged by displaying the differential pressure between three phases through the display screen.
Drawings
FIG. 1 is a schematic view of a panel of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
fig. 3 is a schematic diagram of the use of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The embodiment of the invention relates to a power generation grid-connected nuclear phase protection device, which comprises an A phase voltage detection module 1, a B phase voltage detection module 2, a C phase voltage detection module 3 and a time detection module 4, wherein the A phase voltage detection module 1 comprises an A phase voltage judgment unit 11, an A phase contact switch 12 and an A phase display unit 13; the B-phase voltage detection module 2 comprises a B-phase voltage judgment unit 21, a B-phase contact switch 22 and a B-phase display unit 23; the C-phase voltage detection module 3 comprises a C-phase voltage judgment unit 31, a C-phase contact switch 32 and a C-phase display unit 33; the time detection module 4 includes a delay unit 41 and an auxiliary contact switch 42.
The panel is composed of three groups of independent differential pressure display parts of an A-phase display unit 13, a B-phase display unit 23 and a C-phase display unit 33 and detection terminals as shown in figure 1. The upper part is an A-phase display unit 13, and two sides of the A-phase display unit are respectively a grid side bus A1 phase voltage sensor secondary output connecting terminal 1a and a generator bus A2 phase voltage sensor secondary output connecting terminal 2 a; the middle part is a B-phase display unit 23, and two sides of the B-phase display unit are respectively a power grid side bus B1 phase voltage sensor secondary output connecting terminal 1B and a generator bus B2 phase voltage sensor secondary output connecting terminal 2B; the lower part is a C-phase display unit 33, and two sides of the C-phase display unit are respectively a grid side bus C1 phase voltage sensor secondary output connecting terminal 1C and a generator bus C2 phase voltage sensor secondary output connecting terminal 2C.
The top of the display panel is provided with a 1n detection hole and a 2n detection hole, wherein the 1n detection hole is used for being connected with a secondary central point n1 terminal of a three-phase voltage sensor A1, B1 and C1 on the power grid side; the 2n detection hole is used for being connected with a secondary central point n2 terminal of three-phase voltage sensors at the power generation sides A2, B2 and C1.
An a-phase display unit 13 that displays a differential pressure between the secondary output phase of the upper grid-side bus a1 phase voltage sensor and the secondary output phase of the lower generator bus a2 phase voltage sensor; a phase B display unit 23 that displays a differential pressure between the secondary output phase of the upper grid side bus B1 phase voltage sensor and the secondary output phase of the lower generator bus B2 phase voltage sensor; and a C-phase display unit 33 for displaying a differential pressure between the secondary output phase of the upper grid side bus C1 phase voltage sensor and the secondary output phase of the lower generator bus C2 phase voltage sensor.
Fig. 2 is a schematic diagram of the internal structure of the power generation grid-connected nuclear phase protection device.
The detection point a1 of the a-phase voltage determination unit 11 is connected to the secondary output connection terminal 1a of the grid-side bus a 1-phase voltage sensor, and the detection point a2 is connected to the secondary output connection terminal 2a of the generator bus a 2-phase voltage sensor. Determination of whether A1 and A2 are in phase: when the difference between the detection point a1 and the detection point a2 is judged to be greater than the rated voltage 5% Ue, if the difference is greater than the rated voltage 5% Ue, the a-phase voltage judgment unit 11 controls the a-phase contact switch 12 to be opened, and the a1 and the a2 are out of phase at the moment; if the voltage is less than the rated voltage 5% Ue, the a-phase voltage judgment unit 11 controls the a-phase contact switch 12 to be closed, and it is found that a1 is in phase with a2 at the moment.
B-phase voltage determination unit 21 has detection point B1 connected to grid-side bus B1-phase voltage sensor secondary output phase connection terminal 1B, and detection point B2 connected to generator bus B2-phase voltage sensor secondary output phase connection terminal 2B. B1 and B2 are in phase: when the difference between the detection point B1 and the detection point B2 is judged to be greater than the rated voltage 5% Ue, if the difference is greater than the rated voltage 5% Ue, the B-phase voltage judgment unit 21 controls the B-phase contact switch 22 to be opened, and the B1 and the B2 are out of phase at the moment; if the voltage is less than the rated voltage 5% Ue, the B-phase voltage judgment unit 21 controls the B-phase contact switch 22 to be closed, and it is found that B1 is in phase with B2 at the moment.
The C-phase voltage determination unit 31 has a detection point C1 connected to the grid-side bus C1-phase voltage sensor secondary output phase connection terminal 1C, and has a detection point C2 connected to the generator bus C2-phase voltage sensor secondary output phase connection terminal 2C. Judgment of whether C1 is in phase with C2: when the difference between the detection point C1 and the detection point C2 is judged to be greater than the rated voltage 5% Ue, if the difference is greater than the rated voltage 5% Ue, the C-phase voltage judgment unit 31 controls the C-phase contact switch 32 to be opened, and the C1 and the C2 are out of phase at the moment; if the voltage is less than the rated voltage 5% Ue, the C-phase voltage determination unit 31 controls the C-phase contact switch 32 to be closed, and it is found that C1 is in phase with C2.
The delay unit 41 in the time detection module 4 is driven by the a-phase contact switch 12, the B-phase contact switch 22 and the C-phase contact switch 32 to realize grid-connected phase checking. One end of the delay unit 41 is connected to the other end of the C-phase contact switch 32, one end of the C-phase contact switch 32 is connected to the other end of the B-phase contact switch 22, one end of the B-phase contact switch 22 is connected to the other end of the a-phase contact switch 12, one end of the a-phase contact switch is connected to one terminal of a power generation grid-connected nuclear phase protection device power supply (usually DC220V or DC110V), and the other terminal of the power generation grid-connected nuclear phase protection device power supply is connected to the other end of the delay unit 41.
The working principle of the power generation grid-connected nuclear phase protection device is that three groups of independent voltage detection output contacts of an A phase, a B phase and a C phase are subjected to grid-connected logic simultaneous judgment; when the amplitude, frequency, phase sequence and phase of the power supply voltage at the two ends of the grid-connected switch are inconsistent, differential pressure exists between the phases of the three groups of independent voltage detection modules of the A phase, the B phase and the C phase, the three groups of independent contact switches of the A phase, the B phase and the C phase cannot be closed at the same time, the time delay unit 41 cannot be powered on, and the auxiliary contact 42 cannot be closed; when the differential pressure U of the three independent voltage detection units of the A phase, the B phase and the C phase is less than 5% of the system voltage Ue, the three independent contact switches are closed, the fact that the frequency, the phase sequence and the voltage phase of two paths of power supplies on two sides of the switch are consistent is proved, grid-connected conditions are met, after 3-second stable time delay of the time delay unit 41, the auxiliary contact 42 is closed, and an interlocking signal capable of closing the grid-connected switch is given.
The use method of the power generation grid-connected nuclear phase protection device of the embodiment is as follows:
the method comprises the following steps: and installing a grid-connected nuclear phase protection device, grounding the device, and introducing a working power supply of the device.
Step two: the functions of the device are detected on site, the fact that the phase difference between two sides of a switch read by the device is normal is guaranteed, the action of a grid-connected allowable node output by the device meets the requirement, namely the node is closed when the grid-connected condition is met, and the node is opened when the grid-connected condition is not met.
Step three: as shown in fig. 3, the output signals of the sensors on both sides of the grid-connected switch are introduced into the device, that is, the voltage signals output by the grid-side high-voltage sensor and the power generation-side high-voltage sensor are introduced into the power generation grid-connected nuclear phase protection device, so that the secondary output phase of the grid-side bus a1 phase voltage sensor, the secondary output phase of the grid-side bus B1 phase voltage sensor and the secondary output phase of the grid-side bus C1 phase voltage sensor are respectively connected with one end of the a phase voltage judgment unit, and one end of the B phase voltage judgment unit and one end of the C phase; the secondary output phase of the generator bus A2 phase voltage sensor, the secondary output phase of the generator bus B2 phase voltage sensor and the secondary output phase of the generator bus C2 phase voltage sensor are respectively connected with the other end of the A phase voltage judging unit, and the other end of the B phase voltage judging unit is connected with the other end of the C phase voltage judging unit;
step four: and the grid-connected interlocking node output by the device is accessed to a grid-connected switch protection control circuit, the power generation grid-connected nuclear phase protection device can automatically judge based on the logic judgment relation, and an interlocking signal which allows the grid-connected switch to be switched on is given to a grid-connected switch interlocking control end when the grid-connected condition is met.
The power generation grid-connected nuclear phase protection device of the embodiment can detect the differential pressure of the same phase of the power supplies on two sides of the three-phase switch at the same time, and the switch can not be switched on when any one phase of the three phases has the differential pressure; the time detection unit can only be started if the three-phase power supply has no differential pressure at the same time. In the starting process of the generator, the frequency of the output power supply of the generator is increased from 0Hz to the rated frequency, the frequency between the frequency of the generator and the power supply of a power grid is constantly changed, the device gives an interlocking signal allowing safe switching-on after 3 seconds of stable delay, thereby effectively avoiding the impact of the generator on the power grid caused by the fact that the instantaneous frequency is the same and grid connection is carried out, and also avoiding the electrical accidents caused by the fact that two paths of three-phase voltages are grid connected due to different frequencies, phase sequences, phases and voltage amplitudes.
Claims (6)
1. A power generation grid-connected nuclear phase protection device comprises a first voltage detection module, a second voltage detection module, a third voltage detection module and a time detection module, and is characterized in that the first voltage detection module comprises a first voltage judgment unit and a first contact switch; the second voltage detection module comprises a second voltage judgment unit and a second contact switch; the third voltage detection module comprises a third voltage judgment unit and a third contact switch; the time detection module comprises a delay unit and an auxiliary contact switch; one end of the first voltage judgment unit is connected with a secondary output connecting terminal of a first phase voltage sensor of a power grid side bus, and the other end of the first voltage judgment unit is connected with a secondary output connecting terminal of a first phase voltage sensor of a generator bus; one end of the second voltage judging unit is connected with a secondary output connecting terminal of the second-phase voltage sensor of the power grid side bus, and the other end of the second voltage judging unit is connected with a secondary output connecting terminal of the second-phase voltage sensor of the generator bus; one end of the third voltage judging unit is connected with a secondary output connecting terminal of a third phase voltage sensor of a power grid side bus, and the other end of the third voltage judging unit is connected with a secondary output connecting terminal of a third phase voltage sensor of a generator bus; one end of the first contact switch is connected with one end of a direct-current power supply, the other end of the first contact switch is connected with one end of the second contact switch, the other end of the second contact switch is connected with one end of the third contact switch, the other end of the third contact switch is connected with one end of a time delay unit, and the other end of the time delay unit is connected with the other end of the direct-current power supply; two ends of the auxiliary contact switch are connected with the interlocking control end of the grid-connected switch; the first contact switch, the second contact switch, the third contact switch and the auxiliary contact switch are respectively controlled by a first voltage judging unit, a second voltage judging unit, a third voltage judging unit and a time delay unit.
2. The power generation grid-connected nuclear phase protection device according to claim 1, wherein a first display unit is further connected in parallel to two ends of the first voltage judgment unit, and the first display unit is used for displaying a pressure difference between a secondary output phase of a first phase voltage sensor of a grid side bus and a secondary output phase of a first phase voltage sensor of a generator bus.
3. The power generation grid-connected nuclear phase protection device according to claim 1, wherein a second display unit is further connected in parallel to two ends of the second voltage judgment unit, and the second display unit is used for displaying a pressure difference between a secondary output phase of the second phase voltage sensor of the grid-side bus and a secondary output phase of the second phase voltage sensor of the generator bus.
4. The power generation grid-connected nuclear phase protection device according to claim 1, wherein a third display unit is further connected in parallel to two ends of the third voltage judgment unit, and the third display unit is used for displaying a pressure difference between a secondary output phase of a third phase voltage sensor of a grid side bus and a secondary output phase of a third phase voltage sensor of a generator bus.
5. The power generation grid-connection nuclear phase protection device according to claim 1, wherein the first voltage detection module, the second voltage detection module and the third voltage detection module are three groups of independent voltage detection modules, and perform phase-phase differential pressure in-phase detection on a grid side bus and a generator bus of a three-phase grid-connection switch as grid-connection safety judgment.
6. The use method of the power generation grid-connected nuclear phase protection device according to any one of claims 1 to 5, characterized by comprising the following steps:
(1) voltage signals output by the power grid side high-voltage sensor and the power generation side high-voltage sensor are introduced into the power generation grid-connected nuclear phase protection device, so that a secondary output phase of a first phase voltage sensor of a power grid side bus, a secondary output phase of a second phase voltage sensor of the power grid side bus and a secondary output phase of a third phase voltage sensor of the power grid side bus are respectively connected with one end of a first voltage judgment unit, one end of a second voltage judgment unit and one end of a third voltage judgment unit; the secondary output phase of the first phase voltage sensor of the generator bus, the secondary output phase of the second phase voltage sensor of the generator bus and the secondary output phase of the third phase voltage sensor of the generator bus are respectively connected with the other end of the first voltage judgment unit, and the other end of the second voltage judgment unit is connected with the other end of the third voltage judgment unit;
(2) the first voltage judgment unit judges the pressure difference between the secondary output phase of the first phase voltage sensor of the power grid side bus and the secondary output phase of the first phase voltage sensor of the generator bus; the second voltage judgment unit judges the pressure difference between the secondary output phase of the second-phase voltage sensor of the power grid side bus and the secondary output phase of the second-phase voltage sensor of the generator bus; the third voltage judgment unit judges the pressure difference between the secondary output phase of the third phase voltage sensor of the power grid side bus and the secondary output phase of the third phase voltage sensor of the generator bus; when the judgment result of the first voltage judgment unit is smaller than the preset voltage, the first contact switch is automatically closed, otherwise, the first contact switch is opened; when the judgment result of the second voltage judgment unit is smaller than the preset voltage, the second contact switch is automatically closed, otherwise, the second contact switch is opened; when the judgment result of the third voltage judgment unit is less than the preset voltage, the third contact switch is automatically closed, otherwise, the third contact switch is opened; when the first contact switch, the second contact switch and the third contact switch are automatically closed, the condition of grid connection is met, and at the moment, the time delay unit controls the auxiliary contact to be closed after delaying preset time, and an interlocking signal allowing the grid connection switch to be closed is given to an interlocking control end of the grid connection switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011079020.4A CN112290599A (en) | 2020-10-10 | 2020-10-10 | Power generation grid-connected nuclear phase protection device and use method thereof |
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| CN202011079020.4A CN112290599A (en) | 2020-10-10 | 2020-10-10 | Power generation grid-connected nuclear phase protection device and use method thereof |
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| CN113162111A (en) * | 2021-03-30 | 2021-07-23 | 中国能源建设集团华中电力试验研究院有限公司 | Method and system for reducing reactive impact in power plant grid connection process |
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