CN111541276B - Generator synchronous phasing system and method - Google Patents
Generator synchronous phasing system and method Download PDFInfo
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- CN111541276B CN111541276B CN202010397984.7A CN202010397984A CN111541276B CN 111541276 B CN111541276 B CN 111541276B CN 202010397984 A CN202010397984 A CN 202010397984A CN 111541276 B CN111541276 B CN 111541276B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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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
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Abstract
The invention discloses a generator synchronous phasing system and a generator synchronous phasing method.A main transformer unit is connected with one end of a current-limiting reactor and one end of a generator outlet switch through a main transformer low-voltage side fracture, the other end of the current-limiting reactor is connected with a diesel generator unit and a service load through a high-voltage service bus unit, and the other end of the generator outlet switch is connected with a generator unit through a generator end fracture; a generator outlet switch upper port voltage transformer is installed on a line between a main transformer low-voltage side fracture and a generator outlet switch, a generator terminal voltage transformer is installed on a line between the generator outlet switch and a generator terminal fracture, and a secondary side of the generator outlet switch upper port voltage transformer and a secondary side of the generator terminal voltage transformer are connected with a generator synchronization device.
Description
Technical Field
The invention belongs to the technical field of power debugging and power testing, and relates to a generator synchronous phasing system and method.
Background
Before the generator set is connected to the grid for the first time, a synchronous phasing test is required to be carried out, and the occurrence of non-synchronous grid connection is prevented. In the generator synchronous phasing test, the voltage of a side to be connected and the voltage of a system side are checked in a synchronous device under the same primary power system, and whether the voltage difference, the frequency difference and the angle difference of the two sides are zero or not is judged. In the traditional synchronous phasing method, a generator is generally excited and built up to rated voltage at rated rotating speed, and the generator provides power, or a main transformer reverse-charging generator PT provides power through a power grid. Therefore, the finding of a novel generator synchronous phasing system and method is of great significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a generator synchronous phasing system and a generator synchronous phasing method, which can realize a generator synchronous phasing test and have strong convenience and safety.
In order to achieve the purpose, the generator synchronous phasing system comprises a main transformer unit, a main transformer low-voltage side fracture, a current-limiting reactor, a generator outlet switch unit, a high-voltage station bus unit, a diesel generator unit, a station load, a generator terminal fracture and a generator unit; the generator outlet switch unit comprises a generator outlet switch upper opening voltage transformer and a generator outlet switch;
the main transformer unit is connected with one end of a current-limiting reactor and one end of a generator outlet switch through a main transformer low-voltage side fracture, the other end of the current-limiting reactor is connected with a diesel generator unit and a service load through a high-voltage service bus unit, and the other end of the generator outlet switch is connected with a generator unit through a generator end fracture;
a generator outlet switch upper port voltage transformer is installed on a line between a main transformer low-voltage side fracture and a generator outlet switch, a generator terminal voltage transformer is installed on a line between the generator outlet switch and a generator terminal fracture, and a secondary side of the generator outlet switch upper port voltage transformer and a secondary side of the generator terminal voltage transformer are connected with a generator synchronization device.
The main transformer unit comprises a main transformer, a main transformer high-voltage side switch and a main transformer high-voltage side bus, wherein the main transformer high-voltage side bus is connected with a main transformer low-voltage side fracture through the main transformer high-voltage side switch and the main transformer.
The high-voltage station bus unit comprises a high-voltage station bus voltage transformer, a high-voltage station bus and a high-voltage station bus incoming switch, the current-limiting reactor is connected with the high-voltage station bus through the high-voltage station bus incoming switch, the diesel generator unit and the station load are connected with the high-voltage station bus, and the high-voltage station bus voltage transformer is installed on the high-voltage station bus.
The diesel generator set unit comprises a diesel generator set, a diesel generator set outlet switch, a low-voltage station transformer and a low-voltage station transformer high-voltage side switch, wherein the diesel generator set is connected with the high-voltage station bus through the diesel generator set outlet switch, the low-voltage station transformer and the low-voltage station transformer high-voltage side switch in sequence.
The invention discloses a generator synchronous phasing method, which comprises the following steps:
1) carrying out generator synchronous phasing early-stage preparation work;
2) starting a diesel generator set;
3) judging whether the machine end voltage amplitude and the phase sequence of the diesel generating set are correct, and if so, turning to the step 4), otherwise, turning to the step 5);
4) closing an outlet switch of the diesel generator set, performing an impact test on the low-voltage station transformer, and turning to the step 6);
5) stopping the diesel generating set, checking and eliminating defects, and then turning to the step 2);
6) checking whether the low-voltage station transformer operates normally, and if so, turning to the step 7), otherwise, turning to the step 8);
7) closing a high-voltage side switch of the low-voltage station transformer, performing an impact test on a high-voltage station bus, and turning to the step 9);
8) disconnecting the outlet switch of the diesel generator set, checking and eliminating defects, and then turning to the step 4);
9) checking whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer are correct, and if so, turning to the step 10), otherwise, turning to the step 11);
10) closing the bus incoming line switch for the high-voltage plant, performing impact tests on the current-limiting reactor and the voltage transformer at the upper opening of the generator outlet switch, and turning to the step 12);
11) disconnecting a high-voltage side switch of the low-voltage station transformer, checking and eliminating defects, and then turning to the step 7);
12) checking whether the current-limiting reactor operates normally, and if the current-limiting reactor operates normally, turning to the step 13), otherwise, turning to the step 14);
13) checking whether the voltage amplitude and the phase sequence of the voltage transformer at the upper opening of the generator outlet switch are correct, and if so, turning to the step 15), otherwise, turning to the step 14);
14) disconnecting a high-voltage station bus incoming line switch, checking and eliminating defects, and turning to the step 10);
15) closing an outlet switch of the generator, performing an impact test on a generator terminal voltage transformer, and turning to the step 16);
16) checking whether the voltage amplitude and the phase sequence of the voltage transformer at the generator terminal are correct, and if so, turning to the step 17), otherwise, turning to the step 18);
17) the generator synchronous device carries out synchronous phasing test and then turns to step 19);
18) disconnecting the generator outlet switch, checking and eliminating defects, and then turning to the step 15);
19) checking whether the synchronous phasing test result of the generator is correct, and if so, turning to the step 21), otherwise, turning to the step 20);
20) disconnecting the generator outlet switch and the high-voltage station bus incoming line switch, checking and eliminating defects, and then turning to the step 10);
21) the generator synchronous phasing ends.
The specific operation of the step 1) is as follows: and regulating the service load to a shutdown state.
And 6) judging whether a non-electric quantity alarm signal exists or not by judging whether the operation sound is normal or not in the step 12).
In step 19), the generator synchronization device checks whether the voltage difference, the frequency difference and the angular difference between the voltage to be merged and the system side voltage are zero.
The invention has the following beneficial effects:
during specific operation, a fracture is reserved between the low-voltage side of a main transformer and a generator set follower PT respectively, a diesel generator set is used as a primary power supply and is boosted to the rated voltage of a generator through a low-voltage station transformer, and a generator synchronization device is used for checking the voltage difference, the frequency difference and the angular difference between the voltage of a generator set end voltage transformer to be synchronized and the voltage of an upper port of a system side generator outlet switch so as to judge whether synchronization phasing is correct or not. It should be noted that the diesel generator set is used as a primary system power supply to enhance the convenience of the synchronous phasing test, and the excitation voltage building or main transformer back-flushing voltage transformer is not required to perform synchronous phasing at the rated rotation speed of the generator, so that the diesel generator set is high in practicability and universality, is suitable for the synchronous phasing test of the generator set, and is convenient to popularize and use on site.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a vector diagram of the present invention.
Wherein, 1 is a diesel generator set unit, 2 is a plant load, 3 is a high-voltage plant bus unit, 4 is a current-limiting reactor, 5 is a low-voltage side fracture of a main transformer, 6 is a main transformer unit, 7 is a generator outlet switch unit, 8 is a generator terminal voltage transformer, 9 is a generator terminal fracture, 10 is a generator set, 11 is a generator synchronous device, 1-1 is a diesel generator set, 1-2 is an outlet switch of the diesel generator set, 1-3 is a low-voltage plant transformer, 1-4 is a high-voltage side switch of the low-voltage plant transformer, 3-1 is a high-voltage plant bus voltage transformer, 3-2 is a high-voltage plant bus, 3-3 is a high-voltage plant bus incoming switch, 6-1 is a main transformer, 6-2 is a high-voltage side switch of the main transformer, and 6-3 is a high-voltage side bus of the main transformer, 7-1 is a voltage transformer at the upper opening of the generator outlet switch, and 7-2 is the generator outlet switch.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the generator synchronous phasing system of the invention comprises a main transformer unit 6, a main transformer low-voltage side fracture 5, a current-limiting reactor 4, a generator outlet switch unit 7, a high-voltage station bus unit 3, a diesel generator set unit 1, a station load 2, a generator end fracture 9 and a generator set 10; the generator outlet switch unit 7 comprises a generator outlet switch upper opening voltage transformer 7-1 and a generator outlet switch 7-2; the main transformer unit 6 is connected with one end of a current-limiting reactor 4 and one end of a generator outlet switch 7-2 through a main transformer low-voltage side fracture 5, the other end of the current-limiting reactor 4 is connected with a diesel generator unit 1 and a plant load 2 through a high-voltage plant bus unit 3, and the other end of the generator outlet switch 7-2 is connected with a generator unit 10 through a generator end fracture 9; a generator outlet switch upper port voltage transformer 7-1 is installed on a line between the main transformer low-voltage side fracture 5 and the generator outlet switch 7-2, a generator terminal voltage transformer 8 is installed on a line between the generator outlet switch 7-2 and the generator terminal fracture 9, and the secondary side of the generator outlet switch upper port voltage transformer 7-1 and the secondary side of the generator terminal voltage transformer 8 are connected with a generator synchronization device 11.
The main transformer unit 6 comprises a main transformer 6-1, a main transformer high-voltage side switch 6-2 and a main transformer high-voltage side bus 6-3, wherein the main transformer high-voltage side bus 6-3 is connected with a main transformer low-voltage side fracture 5 through the main transformer high-voltage side switch 6-2 and the main transformer 6-1.
The high-voltage station bus unit 3 comprises a high-voltage station bus voltage transformer 3-1, a high-voltage station bus 3-2 and a high-voltage station bus incoming switch 3-3, the current-limiting reactor 4 is connected with the high-voltage station bus 3-2 through the high-voltage station bus incoming switch 3-3, the diesel generator unit 1 and the station load 2 are connected with the high-voltage station bus 3-2, and the high-voltage station bus voltage transformer 3-1 is installed on the high-voltage station bus 3-2.
The diesel generator set unit 1 comprises a diesel generator set 1-1, a diesel generator set outlet switch 1-2, a low-voltage station transformer 1-3 and a low-voltage station transformer high-voltage side switch 1-4, wherein the diesel generator set 1-1 is connected with a high-voltage station bus 3-2 through the diesel generator set outlet switch 1-2, the low-voltage station transformer 1-3 and the low-voltage station transformer high-voltage side switch 1-4 in sequence.
With reference to fig. 2, the generator contemporaneous phasing method according to the invention comprises the following steps:
1) carrying out generator synchronous phasing early-stage preparation work;
2) starting a diesel generating set 1-1;
3) judging whether the machine end voltage amplitude and the phase sequence of the diesel generating set 1-1 are correct, and if so, turning to the step 4), otherwise, turning to the step 5);
4) closing an outlet switch 1-2 of the diesel generator set, performing an impact test on the low-voltage station transformer 1-3, and turning to the step 6);
5) stopping the diesel generating set 1-1, checking and eliminating defects, and then turning to the step 2);
6) checking whether the low-voltage station transformer 1-3 operates normally, and when the low-voltage station transformer 1-3 operates normally, turning to the step 7), otherwise, turning to the step 8);
7) closing a high-voltage side switch 1-4 of the low-voltage station transformer, performing an impact test on a high-voltage station bus 3-2, and turning to the step 9);
8) disconnecting the outlet switch 1-2 of the diesel generator set, checking and eliminating defects, and then turning to the step 4);
9) checking whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer 3-1 are correct, and if the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer 3-1 are correct, turning to the step 10), otherwise, turning to the step 11);
10) closing a bus incoming line switch 3-3 for the high-voltage plant, performing an impact test on a current-limiting reactor 4 and a voltage transformer 7-1 at the upper opening of a generator outlet switch, and turning to the step 12);
11) disconnecting the high-voltage side switch 1-4 of the low-voltage station transformer, checking and eliminating defects, and then turning to the step 7);
12) checking whether the current-limiting reactor 4 operates normally, and if the current-limiting reactor 4 operates normally, turning to the step 13), otherwise, turning to the step 14);
13) checking whether the voltage amplitude and the phase sequence of the generator outlet switch upper opening voltage transformer 7-1 are correct, and if the voltage amplitude and the phase sequence of the generator outlet switch upper opening voltage transformer 7-1 are correct, turning to the step 15), otherwise, turning to the step 14);
14) disconnecting the high-voltage station bus incoming line switch 3-3, checking and eliminating defects, and then turning to the step 10);
15) closing an outlet switch 7-2 of the generator, performing an impact test on a generator terminal voltage transformer 8, and turning to the step 16);
16) checking whether the voltage amplitude and the phase sequence of the generator terminal voltage transformer 8 are correct, and if the voltage amplitude and the phase sequence of the generator terminal voltage transformer 8 are correct, turning to the step 17), otherwise, turning to the step 18);
17) the generator synchronization device 11 carries out synchronization phasing test and then turns to step 19);
18) disconnecting the generator outlet switch 7-2, checking and eliminating defects, and then turning to the step 15);
19) checking whether the synchronous phasing test result of the generator is correct, and if so, turning to the step 21), otherwise, turning to the step 20);
20) disconnecting the generator outlet switch 7-2 and the high-voltage station bus incoming line switch 3-3, checking and eliminating defects, and then turning to the step 10);
21) the generator synchronous phasing ends.
The specific operation of the step 1) is as follows: the service load 2 is adjusted to a standstill.
And 6) judging whether a non-electric quantity alarm signal exists or not by judging whether the operation sound is normal or not in the step 12).
In step 19), the generator synchronizing device 11 checks whether the voltage difference, the frequency difference and the angular difference between the voltage to be merged and the system side voltage are zero.
In the steps 3), 9), 13) and 16), checking the secondary voltage amplitude of each voltage transformer, and judging whether the three-phase voltage amplitude of the secondary voltage is the primary voltage divided by the transformation ratio of the voltage transformer and whether the zero-sequence voltage is zero; and checking the secondary voltage phase sequence of each voltage transformer, and judging whether the secondary voltage phase sequence is a positive phase sequence.
The vector diagram of the synchronous phasing test is shown in fig. 3, and when the voltage vectors at the side to be parallel are consistent with the voltage vectors at the side of the system, the magnitude is equal, and the direction is the same, the result of the synchronous phasing test is correct.
Claims (4)
1. A generator synchronous phasing method is characterized in that based on a generator synchronous phasing system, the generator synchronous phasing system comprises a main transformer unit (6), a main transformer low-voltage side fracture (5), a current-limiting reactor (4), a generator outlet switch unit (7), a high-voltage station bus unit (3), a diesel generator unit (1), a station load (2), a generator terminal fracture (9) and a generator unit (10); the generator outlet switch unit (7) comprises a generator outlet switch upper opening voltage transformer (7-1) and a generator outlet switch (7-2);
the main transformer unit (6) is connected with one end of a current-limiting reactor (4) and one end of a generator outlet switch (7-2) through a main transformer low-voltage side fracture (5), the other end of the current-limiting reactor (4) is connected with a diesel generator unit (1) and a plant load (2) through a high-voltage plant bus unit (3), and the other end of the generator outlet switch (7-2) is connected with a generator set (10) through a generator end fracture (9);
a generator outlet switch upper port voltage transformer (7-1) is installed on a line between a main transformer low-voltage side fracture (5) and a generator outlet switch (7-2), a generator end voltage transformer (8) is installed on a line between the generator outlet switch (7-2) and a generator end fracture (9), and the secondary side of the generator outlet switch upper port voltage transformer (7-1) and the secondary side of the generator end voltage transformer (8) are connected with a generator synchronization device (11);
the main transformer unit (6) comprises a main transformer (6-1), a main transformer high-pressure side switch (6-2) and a main transformer high-pressure side bus (6-3), wherein the main transformer high-pressure side bus (6-3) is connected with a main transformer low-pressure side fracture (5) through the main transformer high-pressure side switch (6-2) and the main transformer (6-1);
the high-voltage station bus unit (3) comprises a high-voltage station bus voltage transformer (3-1), a high-voltage station bus (3-2) and a high-voltage station bus incoming line switch (3-3), a current-limiting reactor (4) is connected with the high-voltage station bus (3-2) through the high-voltage station bus incoming line switch (3-3), the diesel generator unit (1) and a station load (2) are connected with the high-voltage station bus (3-2), and the high-voltage station bus voltage transformer (3-1) is installed on the high-voltage station bus (3-2);
the diesel generator set unit (1) comprises a diesel generator set (1-1), a diesel generator set outlet switch (1-2), a low-voltage station transformer (1-3) and a low-voltage station transformer high-voltage side switch (1-4), wherein the diesel generator set (1-1) is connected with a high-voltage station bus (3-2) through the diesel generator set outlet switch (1-2), the low-voltage station transformer (1-3) and the low-voltage station transformer high-voltage side switch (1-4) in sequence;
the method comprises the following steps:
1) carrying out generator synchronous phasing early-stage preparation work;
2) starting a diesel generating set (1-1);
3) judging whether the machine end voltage amplitude and the phase sequence of the diesel generator set (1-1) are correct, if so, turning to the step 4, and otherwise, turning to the step 5);
4) closing an outlet switch (1-2) of the diesel generator set, performing an impact test on the low-voltage station transformer (1-3), and turning to the step 6;
5) stopping the diesel generator set (1-1), checking and eliminating defects, and then turning to the step 2);
6) checking whether the low-voltage station service transformer (1-3) operates normally, and if so, turning to the step 7, otherwise, turning to the step 8;
7) closing a high-voltage side switch (1-4) of the low-voltage station transformer, performing an impact test on a high-voltage station bus (3-2), and turning to the step 9);
8) disconnecting the diesel generator set outlet switch (1-2), checking and eliminating defects, and then turning to the step 4);
9) checking whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer (3-1) are correct, and if so, turning to the step 10), otherwise, turning to the step 11;
10) closing a bus incoming line switch (3-3) for the high-voltage plant, performing impact test on a current-limiting reactor (4) and a voltage transformer (7-1) at the upper opening of a generator outlet switch, and turning to the step 12);
11) disconnecting the high-voltage side switch (1-4) of the low-voltage station transformer, checking and eliminating defects, and then turning to the step 7);
12) checking whether the current-limiting reactor (4) operates normally, and when the current-limiting reactor (4) operates normally, turning to the step 13), otherwise, turning to the step 14);
13) checking whether the voltage amplitude and the phase sequence of the generator outlet switch upper opening voltage transformer (7-1) are correct, and if so, turning to the step 15, otherwise, turning to the step 14);
14) disconnecting the high-voltage station bus incoming line switch (3-3), checking and eliminating defects, and then turning to the step 10);
15) closing an outlet switch (7-2) of the generator, performing an impact test on a generator terminal voltage transformer (8), and turning to the step 16);
16) checking whether the voltage amplitude and the phase sequence of the voltage transformer (8) at the generator terminal are correct, and if so, turning to the step 17), otherwise, turning to the step 18);
17) the generator synchronous device (11) carries out a synchronous phasing test and then turns to the step 19);
18) disconnecting the generator outlet switch (7-2), checking and eliminating defects, and then turning to the step 15);
19) checking whether the synchronous phasing test result of the generator is correct, and if so, turning to the step 21), otherwise, turning to the step 20);
20) disconnecting the generator outlet switch (7-2) and the high-voltage station bus incoming line switch (3-3), checking and eliminating defects, and then turning to the step 10);
21) the generator synchronous phasing ends.
2. Method for the contemporaneous phasing of an electric generator according to claim 1, characterized in that the specific operations of step 1) are: the service load (2) is adjusted to an off-state.
3. The generator synchronous phasing method as recited in claim 1, wherein in step 6) and step 12), whether the non-electric quantity alarm signal exists is judged by judging whether the operation sound is normal.
4. Method for generator contemporaneous phasing according to claim 1, characterised in that in step 19) the generator contemporaneous device (11) checks whether the difference in pressure, frequency difference, angular difference between the voltage to be merged and the voltage on the system side is zero.
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| CN110504712B (en) * | 2019-08-21 | 2021-08-31 | 西安热工研究院有限公司 | Pi-type homologous nuclear phase system and method for gas power plant |
| CN110514911B (en) * | 2019-08-28 | 2021-08-24 | 西安热工研究院有限公司 | System and method for generating power plant high-voltage bus power supply phase checking |
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| CN110854925B (en) * | 2019-11-04 | 2021-06-08 | 中国能源建设集团华东电力试验研究院有限公司 | One-time voltage-on synchronous nuclear phase inspection system and inspection method for electrical system |
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