Black-start and emergency generator set control system

Abstract

The utility model discloses a black-start and emergency generator set control system, which belongs to the technical field of black-start circuit design and comprises a generator set, a generator set outlet circuit breaker, a bus, a security section bus, an emergency power supply circuit breaker and a mains supply circuit breaker. The bus is electrically connected with the security section bus through an emergency power supply circuit breaker, and the security section bus is electrically connected with commercial power through a commercial power circuit breaker; under a normal working condition, the commercial power circuit breaker is closed, the commercial power supplies power to the security section bus, when the security section bus loses power, the unit outlet circuit breaker and the emergency power supply circuit breaker are closed, the generator set supplies power to the security section bus, and a diesel generator set is adopted as a black-start and emergency generator set. Power can be supplied to the security section bus through the two circuit breakers, connection is simple and safe, power supply response is rapid, and meanwhile occupied space and cost are saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of black start circuit design, and particularly relates to a generator set control system for black start and emergency use. Background Art

[0002] A patent with the publication number of CN111628567A discloses a diesel generator system that takes into account accident security and black start. The system includes a first diesel generator unit, a second diesel generator unit, a black start diesel generator, a black start diesel generator outlet circuit breaker, a first black start 380V bus power supply unit, a second black start 380V bus power supply unit, a black start 380V bus, a black start power supply outgoing circuit breaker, and a black start transformer. Three diesel generators are connected in parallel to provide a black start emergency power supply for the black start gas turbine. The first diesel generator and the second diesel generator serve as the accident security power supply for the unit. Different starting methods are used for the diesel generator to start as a black start emergency power supply and as an accident security power supply. The system uses a black start generator set to be connected in parallel with the first and second diesel generators respectively to complete the power supply to the first gas turbine security section and the second gas turbine security section. When realizing the parallel power supply of the black start generator set and the first diesel generator, it is necessary to complete the operation of 4 circuit breakers. There are many circuit breakers, and the control and operation are complex, increasing the fault points; the same is true when realizing the parallel connection of the black start generator set and the second diesel generator; and three generators are set, which requires additional investment both in terms of space and cost. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a generator set control system for black start and emergency use, which uses a diesel generator set as a black start and emergency generator set, and can supply power to the security section bus through two circuit breakers, with simple and safe connection and rapid power supply response.

[0004] To solve the above technical problem, the technical solution of the utility model is as follows:

[0005] A generator set control system for black start and emergency use includes: a generator set, a unit outlet circuit breaker, a bus, a security section bus, an emergency power supply circuit breaker, and a mains circuit breaker. The generator set is electrically connected to the bus through the unit outlet circuit breaker. The bus is electrically connected to the security section bus through the emergency power supply circuit breaker. The security section bus is electrically connected to the mains through the mains circuit breaker;

[0006] Under normal conditions, the mains circuit breaker is closed, and the mains supplies power to the security section bus. When the security section bus loses power, the unit outlet circuit breaker and the emergency power supply circuit breaker are closed, and the generator set supplies power to the security section bus.

[0007] Further, it further includes a multifunctional meter, a security section voltage transformer and a security section current transformer for detecting the voltage and current of the security section busbar. The security section voltage transformer and the security section current transformer are respectively electrically connected to the multifunctional meter.

[0008] Further, the multifunctional meter is communicatively connected to a host computer.

[0009] Further, it further includes a mains controller and a unit controller. The multifunctional meter and the emergency power supply circuit breaker are respectively electrically connected to the mains controller. The mains controller and the generator set are respectively communicatively connected to the unit controller. The unit controller is electrically connected to the unit outlet circuit breaker.

[0010] Further, it further includes a unit voltage transformer for detecting the voltage of the generator set and a busbar voltage transformer for detecting the busbar voltage. The busbar voltage transformer and the unit voltage transformer are respectively electrically connected to the unit controller.

[0011] Further, it further includes a mains voltage transformer for detecting the mains voltage. The mains voltage transformer and the mains circuit breaker are respectively electrically connected to the mains controller.

[0012] Further, two paths are respectively provided for the security section busbar and the mains. The two security section busbars are connected to the busbar and the mains to form two power supply circuits. A bus-tie circuit breaker is electrically connected between the two security section busbars.

[0013] Further, two mains controllers are provided. The two mains controllers are respectively electrically connected to the corresponding transformers and circuit breakers in the two power supply circuits, and the two mains controllers are communicatively connected to each other.

[0014] Further, the unit controller includes a unit main controller and a unit standby controller. The unit main controller and the unit standby controller are communicatively connected. The two mains controllers are respectively communicatively connected to the unit main controller and the unit standby controller. When the unit main controller fails, the unit standby controller receives the signals sent by the mains controller and the transformer and outputs corresponding signals.

[0015] After adopting the above technical solutions, the beneficial effects of the present utility model are:

[0016] Since the black-start and emergency power generation unit control system of the present utility model includes: a power generation unit, a unit outlet circuit breaker, a bus, a security section bus, an emergency power supply circuit breaker, and a mains circuit breaker. The power generation unit is electrically connected to the bus through the unit outlet circuit breaker. The bus is electrically connected to the security section bus through the emergency power supply circuit breaker. The security section bus is electrically connected to the mains through the mains circuit breaker. Under normal conditions, the mains circuit breaker is closed, and the mains supplies power to the security section bus. When the security section bus loses power, the unit outlet circuit breaker and the emergency power supply circuit breaker are closed, and the power generation unit supplies power to the security section bus. By using a diesel power generation unit as the black-start and emergency power generation unit, power can be supplied to the security section bus through two circuit breakers. The connection is simple and safe, the power supply response is rapid, and at the same time, the occupied space and cost are saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the primary system structure of the black-start and emergency power generation unit control system of the present utility model;

[0018] Figure 2 is a control block diagram of the black-start and emergency power generation unit control system of the present utility model;

[0019] Figure 3 is a schematic diagram of the black-start and emergency power supply control logic;

[0020] Figure 4 is a schematic diagram of the control logic for exiting the power generation unit;

[0021] In the figure, 1 - Route I mains power, 2 - Route I mains circuit breaker, 3 - Route I security section bus, 4 - Route I security section load, 5 - Route I emergency power supply circuit breaker, 6 - bus, 7 - unit outlet circuit breaker, 8 - power generation unit, 9 - bus-tie circuit breaker, 10 - Route II emergency power supply circuit breaker, 11 - Route II security section load, 12 - Route II security section bus, 13 - Route II mains circuit breaker, 14 - Route II mains power, 15 - Route I security section voltage transformer, 16 - Route I security section current transformer, 17 - multifunctional instrument, 18 - Route I mains voltage transformer, 19 - Route I mains controller, 20 - bus voltage transformer, 21 - unit voltage transformer, 22 - unit main controller, 23 - unit standby controller, 24 - Route II mains controller, 25 - Route II mains voltage transformer, 26 - Route II security section current transformer, 27 - Route II security section voltage transformer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model. However, it should not be construed as a limitation on the protection scope of the present utility model.

[0023] As Figure 1 shown, a generator set control system for black start and emergency use includes: a generator set 8, a generator set outlet circuit breaker 7, a bus 6, emergency power supply section buses (3, 12), emergency power supply circuit breakers (5, 10), and utility power circuit breakers (2, 13). The generator set 8 is electrically connected to the bus 6 through the generator set outlet circuit breaker 7. The bus 6 is electrically connected to the emergency power supply section buses (3, 12) through the emergency power supply circuit breakers (5, 10). The emergency power supply section buses (3, 12) are electrically connected to the utility power (1, 14) through the utility power circuit breakers (2, 13). Under normal operating conditions, the utility power circuit breakers (2, 13) are closed, and the utility power (1, 14) supplies power to the emergency power supply section buses (3, 12). When the emergency power supply section buses (3, 12) lose power, the generator set outlet circuit breaker 7 and the emergency power supply circuit breakers (5, 10) are closed, and the generator set 8 supplies power to the emergency power supply section buses (3, 12).

[0024] As Figure 2 shown, the control system further includes a multifunctional instrument 17, and emergency power supply section voltage transformers (15, 27) and emergency power supply section current transformers (16, 26) for detecting the voltage and current of the emergency power supply section buses (3, 12). The emergency power supply section voltage transformers (15, 27) and the emergency power supply section current transformers (16, 26) are respectively electrically connected to the multifunctional instrument 17. The multifunctional instrument 17 is also communicatively connected to a host computer.

[0025] The multifunctional instrument 17 respectively detects the voltage and current signals of the emergency power supply section buses (3, 12) through the emergency power supply section voltage transformers (15, 27) and the emergency power supply section current transformers (16, 26), and processes the detected signals in three ways. One is to directly display the measured current, voltage, calculated power, etc. on the multifunctional instrument 17. The second is to upload the signals to the host computer through a communication method. The third is to convert whether the voltage is normal into a digital quantity and send it to the utility power controllers (19, 24) respectively as a condition for judging whether the emergency power supply section buses (3, 12) are normally powered.

[0026] As Figure 2 shown, the control system further includes utility power controllers (19, 24) and generator set controllers (22, 23). The multifunctional instrument 17 and the emergency power supply circuit breakers (5, 10) are respectively electrically connected to the utility power controllers (19, 24). The utility power controllers (19, 24) and the generator set 8 are respectively communicatively connected to the generator set controllers (22, 23). The generator set controllers (22, 23) are electrically connected to the generator set outlet circuit breaker 7.

[0027] When the mains controllers (19, 24) determine that the power supply of the security section busbars (3, 12) is abnormal, they send an abnormal signal to the unit controllers (22, 23). The unit controllers (22, 23) control the start of the generator set 8, and sequentially control the closing of the unit outlet circuit breaker 7 and the emergency power supply circuit breakers (5, 10), so that the generator set 8 supplies power to the security section busbars (3, 12).

[0028] As Figure 2 shown, the control system further includes a unit voltage transformer 21 for detecting the voltage of the generator set 8 and a bus voltage transformer 20 for detecting the voltage of the busbar 6. The bus voltage transformer 20 and the unit voltage transformer 21 are respectively electrically connected to the unit controllers (22, 23). After the output voltage of the generator set 8 is normal, it supplies power to the busbar 6, and after the voltage of the busbar 6 is normal, it supplies power to the security section busbars (3, 12).

[0029] The control system further includes mains voltage transformers (18, 25) for detecting the voltage of the mains power supply (1, 14). The mains voltage transformers (18, 25) and the mains circuit breakers (2, 13) are respectively electrically connected to the mains controllers (19, 24). When the mains controllers (19, 24) detect the recovery of the mains power supply (1, 14) through the mains voltage transformers (18, 25), they control the closing of the mains circuit breakers (2, 13), and send a signal to the unit controllers (22, 23) to control the shutdown of the generator set 8 and the disconnection of the unit outlet circuit breaker 7 and the emergency power supply circuit breakers (5, 10).

[0030] In this embodiment, as Figure 2 shown, there are two paths for the security section busbars (3, 12) and the mains power supply (1, 14) respectively. The two security section busbars (3, 12) are connected to the busbar 6 and the mains power supply (1, 14) to form two power supply circuits. Among them, the wiring between one security section busbar and the mains power supply and the generator set 8 is one power supply circuit. There is a bus tie circuit breaker 9 electrically connected between the two security section busbars (3, 12). After the mains power supply (1, 14) is restored and the grid connection of the first path mains circuit breaker 2 fails, after waiting for the successful grid connection of the second path mains circuit breaker 13, it is manually closed through the bus tie circuit breaker 9 to supply power to the first path security section busbar 3.

[0031] Correspondingly, there are two mains controllers. The two mains controllers (19, 24) are respectively electrically connected to the corresponding transformers and circuit breakers in the two power supply circuits. The two mains controllers (19, 24) are communicatively connected. The two mains controllers (19, 24) respectively detect the power supply conditions of the two power supply circuits and control the on / off of the corresponding circuit breakers.

[0032] As Figure 2As shown in the figure, the unit controller includes a unit main controller 22 and a unit standby controller 23. The unit main controller 22 and the unit standby controller 23 are communicatively connected. The two mains power controllers (19, 24) are respectively communicatively connected to the unit main controller 22 and the unit standby controller 23. When the unit main controller 22 fails, the unit standby controller 23 receives the signals sent by the mains power controller and the current transformer and outputs corresponding signals.

[0033] As Figure 3 shown, when the power supply of any one or two security sections is de-energized, taking the first path as an example, its starting power supply logic is as follows:

[0034] (1) When the first-path mains power controller 19 detects that the first-path security section busbar 3 is de-energized, or the second-path mains power controller 24 detects that the second-path security section busbar 12 is de-energized or completely de-energized, the first-path mains power controller 19 or the second-path mains power controller 24 sends a command to start the generating set 8 to the unit main controller 22. The unit main controller 22 starts the generating set 8. After detecting that the voltage of the generating set 8 is normal through the unit voltage transformer 21, it controls the closing of the unit outlet circuit breaker 7. After the busbar voltage transformer 20 detects that the voltage of the busbar 6 is normal, then through the CAN communication method, it transmits signals such as the completion of the unit start-up power supply to the first-path mains power controller 19.

[0035] (2) When the unit main controller 22 fails, the unit standby controller 23 will complete the above-mentioned starting power supply control logic of the generating set 8.

[0036] (3) After the first-path mains power controller 19 receives the completion of the starting power supply of the generating set 8 through the CAN communication method, it controls the closing of the first-path emergency power supply circuit breaker 5, supplies power to the first-path security section busbar 3, and completes the power supply to the first-path security section load 4.

[0037] As Figure 4 shown, taking the case where both paths are de-energized as an example, when the mains power supply is restored and the control logic for withdrawing the power supply of the generating set 8 is as follows:

[0038] (1) When the generating set 8 supplies power to the first-path security section busbar 3 and the second-path security section busbar 12, the mains power is restored. The first path has priority. The first-path mains power controller 19 receives the voltage of the first-path mains power 1 collected by the first-path mains power voltage transformer 18, and performs synchronization detection between the first-path security section busbar 3 and the first-path mains power 1. When synchronized, it issues an anti-parallel grid connection closing command, and the first-path mains power circuit breaker 2 is closed for grid connection; after successful closing, the first-path mains power controller 19 controls the opening of the first-path emergency power supply circuit breaker 5.

[0039] (2) If the grid connection and closing of the I - circuit main power breaker 2 fails, the I - circuit main power controller 19 issues an alarm signal, does not trip the I - circuit emergency power supply breaker 5, and waits for the power supply of the II - circuit security section bus 12 to resume. After that, it is manually closed through the bus - tie breaker to supply power to the I - circuit security section bus 3.

[0040] (3) After completing the power supply operation of restoring the power supply of the I - circuit main power 1 to the I - circuit security section bus 3, the II - circuit main power controller 24 receives the voltage of the II - circuit main power 14 collected by the II - circuit main power voltage transformer 25, and performs synchronization detection between the II - circuit security section bus 12 and the II - circuit main power 14. When synchronized, it issues an anti - grid connection and closing command, and the II - circuit main power breaker 13 is grid - connected and closed; after successful closing, the I - circuit main power controller 19 controls the II - circuit emergency power supply breaker 10 to trip.

[0041] (4) After the unit main controller 22 or the unit standby controller 23 receives the shutdown signals from the I - circuit main power controller 19 and the II - circuit main power controller 24, it issues a tripping command to the unit outlet breaker 7, and the generator set 8 enters the cooling operation state, and then shuts down and enters the standby state.

[0042] The black - start and emergency - capable generator set control system of the present utility model uses a diesel generator set as the black - start and emergency - capable generator set. After the power plant fails and shuts down, power can be supplied to the security section bus through two breakers. The connection is simple and safe, the power supply response is rapid, and at the same time, it saves floor space and cost. Moreover, it adopts a modular controller, and the controllers detect the required parameters and states through communication methods, and the control operation is simple.

[0043] In the description of this specification, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0044] Although the specific implementation manners of the present utility model have been described above, those skilled in the art should understand that the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. These are only illustrative examples, and the protection scope of the present utility model is defined by the claims. Without departing from the principles and essence of the present utility model, those skilled in the art can make various changes or modifications to these implementation manners without any creative labor, but these changes and modifications all fall within the protection scope of the present utility model.

Claims

1. A black start and emergency generator control system, characterized in that: include: Generator set, generator output circuit breaker, busbar, safety section busbar, emergency power supply circuit breaker and mains circuit breaker, the generator set is electrically connected to the busbar through the generator output circuit breaker, the busbar is electrically connected to the safety section busbar through the emergency power supply circuit breaker, and the safety section busbar is electrically connected to the mains through the mains circuit breaker; Under normal operating conditions, the mains circuit breaker is closed, and the mains power supplies power to the safety section bus. When the safety section bus loses power, the unit export circuit breaker and the emergency power supply circuit breaker are closed, and the generator set supplies power to the safety section bus.

2. The black start and emergency generator control system according to claim 1 is characterized in that: It also includes a multifunctional instrument and a security section voltage transformer and a security section current transformer for detecting the voltage and current of the security section busbar. The security section voltage transformer and the security section current transformer are electrically connected to the multifunctional instrument respectively.

3. The black start and emergency generator control system according to claim 2 is characterized in that: The multifunctional instrument is communicatively connected with the host computer.

4. The black start and emergency generator control system according to claim 2 is characterized in that: It also includes a mains controller and a unit controller, the multifunctional instrument and the emergency power supply circuit breaker are electrically connected to the mains controller respectively, the mains controller and the generator set are communicatively connected to the unit controller respectively, and the unit controller is electrically connected to the unit outlet circuit breaker.

5. The black start and emergency generator control system according to claim 4 is characterized in that: It also includes a mains voltage transformer for detecting the mains voltage. The mains voltage transformer and the mains circuit breaker are electrically connected to the mains controller respectively.

6. The black start and emergency generator control system according to claim 4 is characterized in that: It also includes a unit voltage transformer for detecting the voltage of the generator set and a bus voltage transformer for detecting the bus voltage. The bus voltage transformer and the unit voltage transformer are electrically connected to the unit controller respectively.

7. The black start and emergency generator control system according to claim 4 is characterized in that: The safety section busbar and the mains are respectively provided with two routes, the two safety section busbars are connected with the busbar and the mains to form two power supply circuits, and a bus tie circuit breaker is electrically connected between the two safety section busbars.

8. The black start and emergency generator control system according to claim 7 is characterized in that: Two mains power controllers are provided, and the two mains power controllers are electrically connected to corresponding mutual inductors and circuit breakers in the two power supply circuits respectively, and the two mains power controllers are communicatively connected with each other.

9. The black start and emergency generator set control system according to claim 8, characterized in that: The unit controller includes a unit main controller and a unit backup controller, the unit main controller and the unit backup controller are communicatively connected, the two AC power controllers are communicatively connected to the unit main controller and the unit backup controller respectively, when the unit main controller fails, the unit backup controller receives signals sent by the AC power controller and the mutual inductor and outputs corresponding signals.

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