Automatic control system for remote black start of hydropower station dam

Abstract

The utility model provides a remote black start automatic control system for a hydropower station dam, which comprises a dam high-voltage bus and a power station workshop high-voltage bus, the power station workshop high-voltage bus leads a high-voltage power supply to be connected onto the dam high-voltage bus, a diesel generator is connected with the dam high-voltage bus, and a hydraulic generator is connected onto the power station workshop high-voltage bus. A power station workshop high-voltage bus supplies power to a power station workshop low-voltage bus through a unit self-powered outgoing line switch, a unit transformer and a workshop low-voltage incoming line switch, and the power station workshop low-voltage bus is connected with load equipment. The load equipment comprises a generator-transformer set protection system, an excitation system, a speed regulation system, a computer monitoring system and a water-turbine generator set auxiliary system. The remote black start of the hydropower station dam can be realized through the connection between the high-voltage buses and the low-voltage buses, the connection between the high-voltage buses, the connection between the high-voltage buses and the diesel generator and the control and monitoring of the monitoring system.

Description

Technical Field

[0001] The utility model relates to the technical field of power station safety, in particular to a remote black start automatic control system for a dam of a hydropower station. Background Art

[0002] When a large-scale power outage occurs in the power grid where the hydropower station is located, it is required to restore the power supply of the power station through black start in the absence of external power supply, and to have the ability to transmit power to the outside after the power supply of the power station is restored to reduce the loss of the power grid.

[0003] At present, when the power supply to the entire hydropower station disappears, the operating personnel are required to manually start the diesel generator, switch the 10kV of the dam and the related circuit breakers of the 10kV system of the power station building, restore the 0.4kV self-use power system corresponding to the black start unit to supply power to the unit's auxiliary equipment, and the dam power system to supply power to the flood discharge facilities.

[0004] The operation personnel have to start the diesel generator, close the diesel generator output switch, switch the 10kV and 0.4kV factory power, and manually start the unit from zero to increase the voltage. The whole process takes a long time, and all operations are manual. There are extremely high safety risks such as asynchronous, reverse charging, and wrong intervals.

[0005] In view of the inconvenience of black start operation of hydropower station, combined with the power consumption characteristics and equipment layout of hydropower station,

[0006] It is necessary to develop an automatic control system for remote black start of hydropower dams. After the operator initiates the process on the monitoring system, the process automatically starts the diesel generator and switches the 10kV power supply of the spillway dam with the 0.4kV power supply of the dam to power the flood discharge facilities. Summary of the Invention

[0007] The utility model provides a remote black start automatic control system for a hydropower station dam, which overcomes the shortcomings of the above-mentioned remote black start of the hydropower station dam.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A remote black start automatic control system for a hydropower station dam comprises a dam high-voltage busbar and a power station building high-voltage busbar. The power station building high-voltage busbar leads a high-voltage power supply to the dam high-voltage busbar, a diesel generator is connected to the dam high-voltage busbar, and a hydro-generator is connected to the power station building high-voltage busbar. The power station building high-voltage busbar supplies power to the power station building low-voltage busbar through a unit self-use power outgoing line switch, a unit transformer and a power station building low-voltage incoming line switch. The power station building low-voltage busbar is connected to load equipment, which includes a generator-transformer protection system, an excitation system, a speed control system, a computer monitoring system and a hydro-generator unit auxiliary system.

[0010] The above-mentioned hydro-generator is connected to the high-voltage busbar of the power station building through the hydro-generator outlet circuit breaker, the plant transformer, and the plant high-voltage incoming line switch.

[0011] The signal lines of the above-mentioned high-voltage incoming line switch for plant power, turbine generator outlet circuit breaker, unit self-use power outgoing line switch and plant low-voltage incoming line switch are connected to the monitoring system and receive control commands from the monitoring system to realize the switching of the unit black start power supply.

[0012] A first connecting switch and a second connecting switch are provided on the connecting line between the high-voltage busbar of the power plant building and the high-voltage busbar of the dam.

[0013] A third connecting switch is provided between the above-mentioned diesel generator and the dam high-voltage busbar. The third connecting switch has a remote operation switch, which can be electrically switched between the "test" position and the "working" position.

[0014] The above-mentioned monitoring system collects equipment signals of the diesel generator, the plant power high-voltage incoming line switch, the unit's own power outgoing line switch, the first connecting switch, the second connecting switch, the third connecting switch, the turbine generator, the plant transformer, the unit transformer, the load equipment, the turbine generator outlet circuit breaker, the power station plant low-voltage busbar and the plant low-voltage incoming line switch, as well as the control switch equipment signals.

[0015] The utility model provides a remote black start automatic control system for a hydropower station dam, which has the following beneficial effects:

[0016] 1) The utility model uses a full monitoring and full control mode to replace the conventional manual switching operation, realizing the automatic control of the remote black start of the hydropower station dam. The operation is highly automated and can achieve one-button black start in the central control room, greatly saving the remote black start switching operation time of the hydropower station dam.

[0017] 2) The utility model effectively avoids safety risks such as asynchronous operation, reverse charging, and wrong intervals through full monitoring and control and analysis and judgment by the monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is the electrical schematic diagram of the utility model system;

[0020] Figure 2 This is a schematic diagram of the black start process in an embodiment of the present utility model.

[0021] Among them: dam high-voltage busbar 1, power plant building high-voltage busbar 2, diesel generator 3, plant power high-voltage incoming line switch 4, unit power outgoing line switch 5, first connecting switch 6, second connecting switch 7, third connecting switch 8, hydro-generator 9, plant transformer 10, unit transformer 11, load equipment 12, monitoring system 13, hydro-generator outlet circuit breaker 14, power plant building low-voltage busbar 15, plant building low-voltage incoming line switch 16. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following content will systematically and completely describe the specific technical solutions of the present invention in combination with the drawings provided according to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] like Figure 1 As shown in the figure, a remote black start automatic control system for a hydropower station dam includes a dam high-voltage busbar 1 and a power station building high-voltage busbar 2. The power station building high-voltage busbar 2 leads a high-voltage power supply to the dam high-voltage busbar 1, a diesel generator 3 is connected to the dam high-voltage busbar 1, and a hydro-generator 9 is connected to the power station building high-voltage busbar 2. The power station building high-voltage busbar 2 supplies power to the power station building low-voltage busbar 15 through the unit's self-use power outgoing line switch 5, the unit transformer 11 and the power station building low-voltage incoming line switch 16. The power station building low-voltage busbar 15 is connected to the load equipment 12. The load equipment 12 includes a generator-transformer protection system, an excitation system, a speed control system, a computer monitoring system and a hydro-generator auxiliary system.

[0024] The above-mentioned hydro-generator 9 is connected to the high-voltage bus 2 of the power station building through the hydro-generator outlet circuit breaker 14, the plant transformer 10, and the plant high-voltage incoming line switch 4.

[0025] The signal lines of the above-mentioned high-voltage incoming line switch 4 for the plant power supply, the outlet circuit breaker 14 for the turbine generator, the outgoing line switch 5 for the unit's own power supply, and the low-voltage incoming line switch 16 for the plant building are connected to the monitoring system 13 and receive control commands from the monitoring system 13 to realize the switching of the black start power supply for the unit.

[0026] A first contact switch 6 and a second contact switch 7 are provided on the connection line between the power plant high-voltage bus 2 and the dam high-voltage bus 1 .

[0027] A third connecting switch 8 is provided between the diesel generator 3 and the dam high-voltage busbar 1. The third connecting switch 8 has a remote operation switch, which can be electrically switched between a "test" position and a "working" position.

[0028] The monitoring system 13 collects equipment signals from the diesel generator 3, the plant power high-voltage incoming line switch 4, the unit power outgoing line switch 5, the first contact switch 6, the second contact switch 7, the third contact switch 8, the hydro-generator 9, the plant transformer 10, the unit transformer 11, the load equipment 12, the hydro-generator outlet circuit breaker 14, the power plant low-voltage busbar 15, and the plant low-voltage incoming line switch 16, as well as the control switch equipment signals.

[0029] Example:

[0030] The diesel generator 3 is connected to the 10kV bus 1 of the dam, and a 10kV interconnecting line is drawn from the 10kV bus 2 of the power plant building and connected to the 10kV bus 1 of the dam.

[0031] The hydro-generator 9 is connected to the 10kV busbar 2 of the power station building through the hydro-generator outlet circuit breaker 14, the plant transformer 10, and the 10kV plant power incoming line switch 4.

[0032] The 10kV busbar 2 of the power plant building supplies power to the 0.4kV busbar 15 of the power plant building through the unit's own power outgoing line switch 5, the unit transformer 11 and the power plant building's 0.4kV incoming line switch 16.

[0033] The load equipment 12 includes but is not limited to the generator-transformer protection system, excitation system, speed control system, computer monitoring system, hydro-generator auxiliary system, etc.

[0034] The load equipment 12 draws power from the 0.4 kV bus 15 of the power plant building.

[0035] The relevant signal wiring of the 10kV auxiliary power incoming line switch 4, the turbine generator outlet circuit breaker 14, the unit's own power outgoing line switch 5 and the power station building 0.4kV incoming line switch 16 needs to be sent to the monitoring system 13 and receive the control command from the monitoring system 13 to realize the switching of the unit's black start power supply.

[0036] The connecting switch 8 between the dam 10kV busbar 1 and the diesel generator 3 has the function of electrically switching the remote operating switch between the "test" position and the "working" position.

[0037] The unit status in the monitoring system 13 has an islanded operation state with plant power.

[0038] The black start process is a zero-voltage step-up with transformer and has GCB double-side voltage-free closing operation.

[0039] When the monitoring system 13 detects a power outage in the power grid and no external power supply, and when all AC voltage is lost in the power station, it can automatically or manually start the unit black start process, closing the connecting switch 8, connecting switch 7, connecting switch 6, the unit's own power outgoing line switch 5, and the power station building 0.4kV incoming line switch 16 in sequence, energizing the power station building's 0.4kV busbar 15 and supplying power to the load equipment 12, thereby completing the unit black start.

[0040] During a black start, the unit operates at no load or with only auxiliary power load. Although the unit can operate stably, this operating state does not guarantee long-term safe and stable operation. If the black start process or operation at no load or with auxiliary power load lasts too long, monitoring and maintenance of the unit's safe and stable operation will need to be strengthened.

[0041] The busbar has 3 sections and there are 6 switches. In order to adapt to the different sizes of various projects, the system network can be expanded according to the 10kV system main connection to facilitate the design of different needs.

[0042] In order to ensure the stable and reliable operation of the system, the 10kV busbar of the dam can be divided into two sections during actual use. A connecting circuit breaker is installed between the busbars. Two 10kV power supplies are drawn from the power station and connected to the first and second busbars respectively, which serve as backup for each other. Each busbar section is equipped with a diesel generator.

[0043] There is one hydro-turbine generator set, and the number of hydro-turbine generator sets can be determined according to the actual project scale.

[0044] There are two transformers. In actual projects, each unit may correspond to multiple low-voltage plant power transformers and multiple sections of 0.4kV busbars.

[0045] There is one set of load equipment. According to the power supply requirements of different load equipment, the system requiring dual power supply needs to be connected to different busbars respectively and can be expanded as needed.

[0046] There is one monitoring system, which is responsible for collecting signals from all equipment including the diesel generator 3, 10kV plant power incoming line switch 4, unit self-use power outgoing line switch 5, connecting switch 6, connecting switch 7, connecting switch 8, hydro-generator 9, plant transformer 10, unit transformer 11, load equipment 12, hydro-generator outlet circuit breaker 14, power plant building 0.4kV busbar 15, power plant building 0.4kV incoming line switch 16, and controlling switchgear.

[0047] See attached Figure 2 , the control process of this system is as follows:

[0048] Step S1: Start when receiving a black start instruction;

[0049] Step S2: The monitoring system detects that the system is in a no-pressure state and meets the unit black start conditions;

[0050] Step S3: Determine the switch status and control the switches to sequentially set the 10kV auxiliary power incoming line switch 4, the turbine generator outlet circuit breaker 14, and the tie switch 8 to the "off" state;

[0051] Step S4: Determine the switch status and control the switches in sequence to put the unit's own power outgoing line switch 5, the power plant building 0.4kV incoming line switch 16, the connecting switch 6, and the connecting switch 7 into the "closed" state;

[0052] Step S5: Start the diesel generator 3;

[0053] Step S6: After determining that the diesel generator 3 is running stably and without faults, control the interconnection switch 8 to be in the "closed" state;

[0054] Step S7: The system supplies power to each load device 12 to enable it to operate normally and starts the hydro-generator 9 to the "idling" state;

[0055] Step S8: Determine the voltage synchronization condition on both sides of the hydro-generator outlet circuit breaker 14, and close the hydro-generator outlet circuit breaker 14 when the voltage synchronization condition on both sides is met;

[0056] Step S9: The generator excitation system is activated, the generator transformer is boosted to the rated voltage, and the generator is in a no-load operation state with the main transformer;

[0057] Step S10: disconnect the tie switch 8 and close the 10kV auxiliary power incoming line switch 4. The power supply for the unit is provided by the auxiliary power transformer 11, and the unit is in a state of operating with auxiliary power load.

[0058] Step S11: After the system runs stably, the diesel generator 3 is turned off to complete the black start.

Claims

1. A remote black start automatic control system for a hydropower station dam, characterized in that: The utility model comprises a dam high-voltage busbar (1) and a power plant building high-voltage busbar (2), wherein the power plant building high-voltage busbar (2) leads a high-voltage power supply to the dam high-voltage busbar (1), a diesel generator (3) is connected to the dam high-voltage busbar (1), a hydro-generator (9) is connected to the power plant building high-voltage busbar (2), the power plant building high-voltage busbar (2) supplies power to the power plant building low-voltage busbar (15) through the unit self-use power outgoing line switch (5), the unit transformer (11) and the power plant building low-voltage incoming line switch (16), the power plant building low-voltage busbar (15) is connected to the load equipment (12), and the load equipment (12) comprises a generator-transformer protection system, an excitation system, a speed control system, a computer monitoring system and a hydro-generator unit auxiliary system.

2. A hydropower station dam remote black start automatic control system according to claim 1, characterized in that: The hydro-generator (9) is connected to the high-voltage busbar (2) of the power station building through the hydro-generator outlet circuit breaker (14), the plant transformer (10), and the plant high-voltage incoming line switch (4).

3. A hydropower station dam remote black start automatic control system according to claim 2, characterized in that: The signal lines of the plant power high-voltage incoming line switch (4), the turbine generator outlet circuit breaker (14), the unit self-use power outgoing line switch (5), and the plant low-voltage incoming line switch (16) are connected to the monitoring system (13), and receive control commands from the monitoring system (13) to realize the switching of the unit black start power supply.

4. A hydropower station dam remote black start automatic control system according to claim 3, characterized in that: A first connecting switch (6) and a second connecting switch (7) are provided on the connecting line between the power plant high-voltage busbar (2) and the dam high-voltage busbar (1).

5. A hydropower station dam remote black start automatic control system according to claim 4, characterized in that: A third connecting switch (8) is provided between the diesel generator (3) and the dam high-voltage busbar (1). The third connecting switch (8) is provided with a remote operating switch. The remote operating switch can be electrically switched between a "test" position and a "working" position.

6. A hydropower station dam remote black start automatic control system according to claim 5, characterized in that: The monitoring system (13) collects equipment signals of the diesel generator (3), the plant power high-voltage incoming line switch (4), the unit self-use power outgoing line switch (5), the first connecting switch (6), the second connecting switch (7), the third connecting switch (8), the hydro-generator (9), the plant transformer (10), the unit transformer (11), the load equipment (12), the hydro-generator outlet circuit breaker (14), the power plant low-voltage busbar (15) and the plant low-voltage incoming line switch (16) as well as the control switch equipment signal.

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