Power station generator voltage automatic control system

Abstract

The utility model discloses a power station generator voltage automatic control system, which is characterized in that a monitoring system is arranged to monitor the operation condition of each generator set and feed back the operation condition to a control master station, the control master station sends a control command to each control substation according to the operation condition, and the control substations control the operation of each generator set according to the control command. Wherein the monitoring system is composed of a monitoring host and a plurality of monitoring submachines, the monitoring host is fixedly arranged on the generator set and used for directly collecting voltage of a voltage collecting module and communicating with a control master station, and the monitoring submachines can be distributed at a plurality of point positions of the generator set, collect temperature and vibration information of each point position and send the temperature and vibration information to the monitoring host. One set of monitoring system can monitor multiple positions of the generator set, the monitoring effect is better, information collection is more comprehensive, and compared with a transmission AVC system, the embodiment of the utility model can collect temperature and vibration factors influencing the generating voltage of the generator set, so that a worker can conveniently judge the operation condition of the generator set.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of generator control, in particular to the technical field of power station generator voltage automatic control system. BACKGROUND

[0002] The generator automatic voltage control system (AVC) is widely used in various power plants, and the current automatic voltage control usually adopts the plant mode or the single machine mode. The generator automatic voltage control system is an important means to ensure the voltage quality of electric energy, and also provides support for the safe and stable operation of the power grid. The automatic voltage control system on the power generation side receives the bus voltage instructions or reactive power instructions issued by the power dispatching center through the power plant remote machine, and performs real-time tracking and regulation and control on the reactive power output of the generator or the voltage of the high-voltage side bus. At the same time, the power plant remote machine uploads the regulation and control operation conditions of the automatic voltage control to the power grid dispatching center, so that the power dispatching center can realize the reasonable flow of reactive power in the control area power grid, enhance the stability and safety of the power system operation, ensure the voltage quality, improve the overall power supply level of the power grid, and reduce the reactive power loss of the power grid. However, there are many factors that affect the generator voltage, such as generator temperature, environmental temperature, and generator vibration, which can be used as auxiliary criteria for the control system. The existing generator automatic voltage control system cannot accurately control the generator voltage, and the collected information is not comprehensive, and the control ability is poor. SUMMARY

[0003] The utility model discloses a kind of power station generator voltage automatic control systems, can collect real-time environmental conditions of generator set and generator set itself condition, facilitate analysis control, and this technology can safely and effectively improve the control ability of generator voltage, enhance the function of smart grid.

[0004] To achieve the above object, the utility model provides a kind of power station generator voltage automatic control system, including control main station, a plurality of with the control main station communication connection monitoring system, with the control main station communication connection control substation, the control substation is used to control each generator set operation, the monitoring system is respectively set in each generator set, the monitoring system includes a plurality of monitoring host and a plurality of with the monitoring host cooperation monitoring slave machine, the monitoring host includes main processor and with the main processor electric connection voltage acquisition module, power supply module, first wireless communication module, network module;

[0005] The monitoring slave machine includes shell, microprocessor arranged in the shell, and temperature sensor, vibration sensor, battery, second wireless communication module electrically connected with the microprocessor, the monitoring slave machine is wirelessly communicated and connected with the first wireless communication module of the monitoring host by the second wireless communication module.

[0006] Preferably, the shell is provided with a sticking surface for sticking the shell.

[0007] Preferably, the shell is provided with a proximity sensor arranged towards the sticking surface.

[0008] Preferably, the shell further comprises a seat body detachably connected to the shell, and the sticking surface is arranged on the seat body.

[0009] Preferably, the seat body is provided with a clamping groove matched with the shell, the shell is provided with a clamping portion matched with the clamping groove, and the sticking surface is arranged on a side away from the clamping portion.

[0010] Preferably, the power supply module comprises an external power supply module, an internal power supply module and a power supply switching module.

[0011] Preferably, the first wireless communication module and the second wireless communication module are both Bluetooth communication modules.

[0012] The power station generator voltage automatic control system has the advantages that: the monitoring system is arranged to monitor the operation of each generator set and feed back to the control master station, the control master station sends control commands to each control substation based on the monitoring result, and each control substation controls the operation of each generator set based on the control commands, the monitoring system comprises a monitoring host and a plurality of monitoring submachines, the monitoring host is fixedly arranged on the generator set and used for directly collecting the voltage collection module and communicating with the control master station, and the monitoring submachines are distributed at a plurality of points of the generator set, collect the temperature and vibration information of each point, and send the information to the monitoring host, one set of monitoring system can monitor a plurality of positions of the generator set, the monitoring effect is better, the information collection is more comprehensive, compared with the transmission AVC system, the embodiment can collect the temperature and vibration factors affecting the generator set voltage, so that the operator can conveniently judge the operation of the generator set, and when the generator set does not reach the target voltage, the operator can judge whether the working environment and working condition of the generator set have problems based on the monitoring information.

[0013] The features and advantages of the present application will be illustrated in detail with reference to the embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic view of the power station generator voltage automatic control system of the present application.

[0015] Figure 2 is a schematic view of the monitoring host and the monitoring submachine of the power station generator voltage automatic control system of the present application.

[0016] Figure 3 is a schematic view of the monitoring submachine shell of the present application.

[0017] Figure 4 is Figure 3 The structure of the middle seat body is shown in the schematic view.

[0018] Figure 5 is Figure 3 The structure of the lower view is shown in the schematic view.

[0019] wherein:

[0020] 1-control master station; 23-control substation; 4-monitoring host; 5-monitoring submachine; 41-main processor; 42-power supply module; 43-first wireless communication module; 44-network module; 45-voltage acquisition module; 51-microprocessor; 52-temperature sensor; 53-vibration sensor; 54-casing; 55-battery; 56-second wireless communication module; 57-pasting surface; 58-proximity sensor; 421-external power supply module; 422-built-in power supply module; 423-power supply switching module; 541-seat body; 542-clamping part; 5411-clamping groove DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below through the drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the scope of the utility model. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0022] In the description of the utility model, it should be explained that when an element is called "fixed to" or "set to" another element, it can be directly on another element or indirectly on another element. When an element is called "connected to" another element, it can be directly connected to another element or indirectly connected to another element.

[0023] In the description of the utility model, it is necessary to explain that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product when it is usually placed, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited. The meaning of "several" is one or more than one, unless otherwise specifically limited.

[0024] In the description of the utility model, it is also necessary to explain that, unless otherwise specifically provided and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. Example one

[0025] Reference Figure 1 , Figure 2 , Figure 3The utility model discloses a power station generator voltage automatic control system, including control main station 1, a plurality of with control main station 1 communication connection's monitoring system, with control main station 1 communication connection's control substation 3, control substation 3 is used for controlling each generator set operation, monitoring system is respectively arranged at each generator set place and is used for monitoring the operation condition of each generator set, monitoring system includes a plurality of monitoring host computer 4 and a plurality of with monitoring host computer 4 cooperation's monitoring submachine 5, monitoring host computer 4 is fixedly arranged on the generator set and is used for directly gathering voltage acquisition module 45 and with control main station 1 communication, and monitoring submachine 5 can be distributed in the multiple point of generator set, respectively gathers the monitoring information of each point, and sends monitoring host computer 4, monitoring host computer 4 includes main processor 41 and with voltage acquisition module 45, power supply module 42, first wireless communication module 43, network module 44 of main processor 41 electric connection, monitoring submachine 5 includes the casing 54, be located in the microprocessor 51 of casing 54, and with temperature sensor 52, vibration sensor 53, battery 55, second wireless communication module 56 of microprocessor 51 electric connection, monitoring submachine 5 is through second wireless communication module 56 with the wireless communication connection of first wireless communication module 43 of monitoring host computer 4. In the embodiment, the operation condition of each generator set is monitored by the monitoring system and is fed back to the control main station 1, and the control main station 1 sends control commands to each control substation 3 based on the operation condition, and each control substation 3 controls the operation of each generator set based on the control commands. The monitoring system is composed of the monitoring host computer 4 and the plurality of monitoring submachines 5. The monitoring host computer 4 is fixedly arranged on the generator set and is used for directly gathering the voltage acquisition module 45 and communicating with the control main station 1. The monitoring submachines 5 can be distributed at the plurality of points of the generator set, gather the temperature and vibration information of each point respectively, and send the monitoring host computer 4. One set of monitoring system can monitor the plurality of positions of the generator set, the monitoring effect is better, the information collection is more comprehensive, compared with the traditional AVC system, the embodiment can collect the temperature and vibration factors affecting the generator voltage, so as to facilitate the staff to judge the operation condition of the generator set. When the generator set does not reach the target voltage, the working environment and working condition of the generator set can be judged according to the monitoring information to determine whether there is a problem. Embodiment two

[0026] Referring to Figure 3 , Figure 4 , Figure 5 On the basis of embodiment one, the casing 54 is provided with a sticking surface 57 for sticking and fixing. The monitoring submachine 5 can be fixed at each position of the generator set.

[0027] Referring to Figure 3 , Figure 4 , Figure 5The casing 54 is provided with a proximity sensor 58 facing the adhesive surface 57. When the casing 54 is detached from the generator set, the proximity sensor 58 is no longer blocked, and sends a signal to the monitoring host 4 and the control host 1, so that the staff can find the problem in time.

[0028] Referring to Figure 3 , Figure 4 , Figure 5 The casing 54 further comprises a seat body 541 detachably connected thereto, and the adhesive surface 57 is arranged on the seat body 541. The casing 54 is indirectly fixed on the generator set through the seat body 541, and when the monitoring sub-machine 5 needs to be maintained, the casing 54 can be directly detached from the seat body 541, which is convenient for maintenance.

[0029] Referring to Figure 3 , Figure 4 , Figure 5 The seat body 541 is provided with a clamping groove 5411 matched with the casing 54, and the surface of the casing 54 is provided with a clamping portion 542 matched with the clamping groove 5411, and the adhesive surface 57 is arranged on the side away from the clamping portion 542. The casing 54 is connected with the seat body 541 through the cooperation of the clamping portion 542 and the clamping groove 5411, which is convenient for installation and disassembly.

[0030] Preferably, the middle part of the seat body 541 is provided with a hollow hole, so that the casing 54 is attached to the surface of the generator set,

[0031] Referring to Figure 2 The power supply module 42 comprises an external power supply module 421, an internal power supply module 422 and a power supply switching module 423. The external power supply module 421 is directly powered by external power supply, the internal power supply module 422 has the function of power storage, and when the external power supply is abnormal, the power supply switching module 423 can immediately switch to the internal power supply module 422 to avoid monitoring failure.

[0032] Preferably, the first wireless communication module 43 and the second wireless communication module 56 are both Bluetooth communication modules. Bluetooth communication has high stability and low cost. Embodiment three

[0033] The automatic voltage control method of the existing generator adopts the equal power factor distribution method, and the existing technology is optimized and transformed through long-term observation and data analysis. According to the historical alarm signals and data, it is found that the blocking signal is mainly the magnetic field increase blocking, and the main reason is that the generator set terminal voltage is high. For example, the rated voltage of the generator terminal is 27kV. The generator protection setting value: the lower limit value V / HZ of the inverse time limit of overexcitation is 1.07, the delay time is 72s, and the action mode is full stop; the setting value of the excitation regulator V / HZ is 1.06, the delay time is 1s; the setting value of the AVC system generator set terminal voltage increase blocking (single side) is 28.3kV (1.048), and the blocking return value is 0.023kV. The setting value of the "power plant terminal-voltage setting value high limit" is 545kV, and the system bus voltage is in a high value for a long time, which causes the terminal voltage to reach 28.3kV frequently, and runs around the blocking value for a long time. It is found that the terminal voltage fluctuation range is 0-0.150kV, so the phenomenon of "magnetic field increase blocking-recovery" frequently occurs. In addition, when the active load of the unit is 1000MW and 400MW, the magnetic field increase and decrease blocking will also be triggered. The solution method of the embodiment is: 1. the blocking recovery value is changed from 0.023kV to 0.130kV; 2. the terminal voltage increase blocking (single side) setting value is changed from 28.3kV to 28.35kV; 3. the active load increase and decrease magnetic high blocking value is changed from 1000MW to 1050MW; 4. the active load increase and decrease magnetic low blocking is changed from 400MW to 350MW.

[0034] In the voltage regulation process, the regulation step is too large, which causes the terminal voltage and reactive power to fluctuate. The operation data is recorded and analyzed, and it is found that the terminal voltage of the generator increases or decreases by 0.08-0.16kV every time the magnetic field increases or decreases, and the reactive power increases or decreases by 8-16MVar. There is a lack of regulation accuracy, especially when approaching the upper and lower limits of regulation, the regulation step is unstable and too large, and the change of voltage and reactive power will cause the voltage regulating system to be frequently blocked, or the voltage and current limit action of the excitation system will cause the AVC to exit. Through long-term data collection and analysis, it is found that among the many increase and decrease magnetic constraints, one condition appears most frequently, such as the upper and lower limits of the terminal voltage. The solution method is: 1. logic optimization, for the upper and lower limit values frequently reached in normal operation, the constraint condition is changed to: current voltage + increment voltage > voltage upper limit value or current voltage - decrement voltage < voltage lower limit value, the voltage regulating system does not act, and the present situation is maintained. After the logic optimization, the frequent increase and decrease magnetic blocking can be obviously improved, and the aging of the generator insulation material can be slowed down. After the optimization of the system, the performance is further improved, which is beneficial to the stability of the generator voltage and reactive power, improves the reactive power distribution of the power grid and the operating environment of the unit, improves the safety and stability of the power grid, and promotes the intelligent level of the power grid construction.

[0035] The working process of the utility model:

[0036] The utility model discloses a kind of power station generator voltage automatic control systems, in working process, monitoring host computer 4 is fixedly arranged on generator set and is used to directly collect voltage acquisition module 45 and communicate with control master station 1, while monitoring submachine 5 can be distributed in each different point of generator set and power station environment, respectively collect the monitoring information of each point and power station environment, collect abnormal temperature and vibration condition, and send to monitoring host computer 4, by monitoring host computer 4 packet sending to control master station 1, control master station 1 sends control command to each control substation 3, and control substation 3 controls each generator set operation according to control command.

[0037] Standard parts used in the present application file can be purchased from the market, the specific connection mode of each part adopts the conventional means such as bolt, rivet, welding in the prior art, electric sliding rail sliding seat, cylinder, welding machine, electric telescopic rod and controller internal components adopt conventional model in the prior art, and its internal structure belongs to prior art structure, and worker can complete normal operation according to prior art manual, plus circuit connection adopts conventional connection mode in the prior art, which will not be described in detail.

[0038] It should be noted that, although the above embodiments have been described in this paper, it is not limited to the scope of the patent protection of the utility model. Therefore, based on the innovative concept of the utility model, the changes and modifications of the embodiments described in this paper, or the equivalent structure or equivalent process transformation made by using the contents of the utility model specification and drawings, directly or indirectly apply the above technical solutions to other related technical fields, are all included in the protection scope of the utility model patent.

Claims

1. An automatic voltage control system for a power plant generator, comprising a control master station (1), a plurality of monitoring systems communicatively connected to the control master station (1), and control substations (3) communicatively connected to the control master station (1), wherein the control substations (3) are used to control the operation of each generator set, and the monitoring systems are respectively located at the outlets of each generator set, characterized in that: The monitoring system comprises a plurality of monitoring hosts (4) and a plurality of monitoring sub-machines (5) cooperating with the monitoring hosts (4), the monitoring host (4) comprises a main processor (41) and a voltage acquisition module (45), a power supply module (42), a first wireless communication module (43) and a network module (44) electrically connected with the main processor (41); The monitoring sub-machine (5) comprises a shell (54), a microprocessor (51) arranged in the shell (54), a temperature sensor (52), a vibration sensor (53), a battery (55) and a second wireless communication module (56) electrically connected with the microprocessor (51), the monitoring sub-machine (5) is wirelessly connected with the first wireless communication module (43) of the monitoring host (4) through the second wireless communication module (56).

2. A voltage automatic control system for a power station generator as claimed in claim 1, characterized in that: One side of the shell (54) is provided with a sticking surface (57) for sticking and fixing.

3. A voltage automatic control system for a power station generator as claimed in claim 2, characterized in that: The shell (54) is provided with a proximity sensor (58) facing the sticking surface (57).

4. A voltage automatic control system for a power station generator as claimed in claim 2, characterized in that: The shell (54) further comprises a seat body (541) detachably connected therewith, and the sticking surface (57) is arranged on the seat body (541).

5. A voltage automatic control system for a power station generator as claimed in claim 4, characterized in that: The seat body (541) is provided with a clamping groove (5411) matched with the shell (54), the surface of the shell (54) is provided with a clamping portion (542) matched with the clamping groove (5411), and the sticking surface (57) is arranged on the side away from the clamping portion (542).

6. A voltage automatic control system for a power station generator as claimed in claim 1, characterized in that: The power supply module (42) comprises an external power supply module (421), an internal power supply module (422) and a power supply switching module (423).

7. A voltage automatic control system for a power station generator as claimed in claim 1, characterized in that: The first wireless communication module (43) and the second wireless communication module (56) are both Bluetooth communication modules.

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