CN103633644B - Power grid impact load automatic balancing device and balancing method - Google Patents
Power grid impact load automatic balancing device and balancing method Download PDFInfo
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- CN103633644B CN103633644B CN201310577798.1A CN201310577798A CN103633644B CN 103633644 B CN103633644 B CN 103633644B CN 201310577798 A CN201310577798 A CN 201310577798A CN 103633644 B CN103633644 B CN 103633644B
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- 238000005338 heat storage Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
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- 238000005096 rolling process Methods 0.000 description 1
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Abstract
A power grid impact load automatic balancing device and method relate to an affiliated device for safety operation of an isolated power grid, in particular to an impact load automatic balancing device aiming at a small power grid. The power grid impact load automatic balancing device comprises an automatic controller and a load real-time compensator and is characterized in that the load real-time compensator comprises an electrode hot water boiler (5), a heat accumulating tank (11), a heat exchanger and a circulation pump (8); the automatic controller comprises a dynamic load collecting analysis module (9) and a compensation power controller (7); the dynamic load collecting analysis module is connected with a user load bus of the power grid; the compensation power controller is connected to the electrode hot water boiler; a first stage loop of the heat exchanger is communicated with a water inlet and a water outlet of the electrode hot water boiler; a second stage loop of the heat exchanger is connected with a water supplying circulation system of a grid boiler or is connected to an external cooling circulation water system. The power grid impact load automatic balancing device and method have the beneficial effects of ensuring the stable operation of the power grid, improving the production efficiency and saving energy.
Description
Technical Field
The invention relates to an accessory device for safe operation of an isolated power grid, in particular to an automatic impact load balancing device for a small power grid.
Background
The generator sets on the power grid run in parallel, and then the power is transmitted to users by power transmission, transformation and distribution equipment. As the demand for electric energy increases, more and more units are incorporated into the grid, resulting in an increasing size of the grid. The large power grid has the advantages of reliable power supply and stable frequency and voltage. However, with the rapid development of national economy, the scale of industrial enterprises is continuously enlarged, and in order to save energy, reduce consumption, improve economic benefits and reduce production cost, enterprise self-provided power plants are established in many high-energy-consumption industries such as steel, electrolytic aluminum and the like. Because the capacity of the power plant units is small, the power plant units are often separated from a large power grid due to power transmission line faults and the like, and some power plant units cannot be incorporated into the power grid even due to various reasons, so that one unit or a plurality of units have to form isolated network operation. Because the number of units operating in an isolated network is small, the unit capacity is small, the system stability is poor, the system frequency is often caused to fluctuate greatly, even the unit is tripped, the power failure of the whole plant is caused, and serious loss is caused.
In the isolated network operation, the proportion of the total capacity occupied by the single unit is large, if the load change of the single unit cannot be balanced with the load of a user, the load change of the single unit is directly reflected to the network frequency, and the influence on the network frequency is large, so that the unit cannot stably operate. According to experience, the maximum regulating quantity of the steam turbine speed regulator is smaller than 8% of the rated capacity of a unit or smaller, so that the grid frequency can be guaranteed to be stable, the intermittent operation of equipment such as an electric arc furnace and a rolling mill of an iron and steel enterprise can cause frequent fluctuation of a large load, the capacity of a small grid is smaller, the load fluctuation quantity greatly exceeds the maximum regulating quantity of the steam turbine speed regulator, the grid frequency greatly fluctuates, the actions such as overspeed or low-cycle protection are frequent, and finally the frequency collapses, so that the isolated grid cannot be maintained to operate.
Disclosure of Invention
The invention aims to provide a device and a method for automatically balancing the impact load of a power grid, so as to achieve the purposes of stabilizing the impact load of the power grid, stabilizing the frequency of the power grid and prolonging the service life of a generator set.
The invention discloses an automatic balancing device for impact load of a power grid, which comprises an automatic control device and a real-time load compensation device, and is characterized in that the real-time load compensation device comprises an electrode hot water boiler, a heat storage tank, a heat exchanger and a circulating pump; the automatic control device comprises a dynamic load acquisition and analysis module and a compensation power controller; the dynamic load acquisition and analysis module is connected to a user load bus of a power grid, and the compensation power controller is connected to the electrode hot water boiler; the primary loop of the heat exchanger is communicated with the water inlet and the water outlet of the electrode hot water boiler, and the secondary loop of the heat exchanger is connected to a water supply circulating system of the power grid boiler or an external cooling circulating water system.
The invention discloses a method for automatically balancing impact load of a power grid, which is characterized by comprising the following steps:
1) numerical value sampling:
step 1-1, collecting a user total load sampling value in a power grid by a dynamic load collection and analysis module;
step 1-2, the dynamic load acquisition and analysis module compares the total load sampling value with a set initial value for operation to obtain a total power deviation value, and further obtain a power output instruction value of the load real-time compensation device;
2) pressure regulation:
step 2-1: the compensation power controller regulates the pressure of an electrode hot water boiler of the load real-time compensation device according to the power output instruction value; when the load of a user load bus is small, the electricity load consumption of the electrode hot water boiler is increased; when the load of a user load bus is large, the electric load consumption of the electrode hot water boiler is reduced;
3) water circulation:
step 3-1, feeding water with higher temperature into a heat storage tank after being heated by an electrode hot water boiler, and then transferring heat energy to a water supply system of a power grid boiler through a heat exchanger; or,
and 3-2, feeding the water with higher temperature into a heat storage tank after being heated by the electrode hot water boiler, and then transferring the excess heat energy to an external cooling circulating water system through a heat exchanger.
When the device and the method for automatically balancing the impact load of the power grid are used, the power output of a generator is connected with a user load bus and a dynamic load acquisition and analysis module after passing through a transformer, the dynamic load acquisition and analysis module obtains a total power deviation value after calculating and comparing a total load sampling value with a power reference value, and then a power output instruction value is obtained to be used as a control signal of a compensation power controller; and the compensation power controller regulates the voltage according to the power output instruction value, so that the electrode hot water boiler carries out real-time compensation according to the load on the user load bus, and further the total load of the power grid is kept within the frequency modulation capacity range of the generator. In addition, the load real-time compensation device is provided with a water circulation device, so that heat generated by balancing impact load is sent back to the generator set through the heat exchanger to generate electricity again; the method has the advantages of ensuring the stable operation of the power grid, improving the production efficiency and saving energy.
Drawings
Specific embodiments of the present invention are partially disclosed in the accompanying drawings, in which,
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic diagram of the working principle of the dynamic load collection and analysis module;
FIG. 3 is a schematic structural diagram of a load real-time compensation apparatus according to an embodiment;
FIG. 4 is a schematic comparison of load dynamics curves.
Detailed Description
As shown in fig. 1, the automatic balancing device for grid impact load provided by the present invention includes a dynamic load acquisition and analysis module 9 and a compensation power controller 7. The dynamic load acquisition and analysis module can be formed by combining a sensor and a data processing chip, and can also be an existing electric quantity data acquisition module; the compensation power controller 7 is a thyristor controller, and can also be implemented by using a PLC in cooperation with a voltage regulation module, which are easily thought and implemented by those skilled in the art, and thus will not be described in detail.
As shown in fig. 2, the dynamic load collection and analysis module collects a total load sampling value of the power output of the generator 1 after passing through the transformer 14, and compares the total load sampling value with a set initial value to obtain a total power deviation value, so as to obtain a power output instruction value of the load real-time compensation device. The output end of the dynamic load acquisition and analysis module is connected to the electrode hot water boiler through a compensation power controller. The compensation power controller regulates the pressure of the electrode hot water boiler of the load real-time compensation device according to the power output instruction value; when the load of a user load bus is small, the electricity load consumption of the electrode hot water boiler is increased; when the load of a user load bus is large, the electric load consumption of the electrode hot water boiler is reduced.
The load real-time compensation device comprises an electrode hot water boiler 5, a heat storage tank 11, a heat exchanger and a circulating pump 8. The heat exchanger comprises a condensate water heat exchanger 6 and a backup heat exchanger 15. And a secondary loop of the condensed water heat exchanger is connected with a water supply circulating system of the power grid boiler. The condensed water flowing out of the condenser 3 passes through the condensed water heat exchanger and then reenters the water supply circulating system of the generator set, and enters the electric network boiler after passing through the deaerator 4. And the secondary loop of the standby heat exchanger is connected to a cooling circulating water system of the power grid steam turbine 2, and transmits the excess waste heat energy to the open cooling system for abandonment.
In the embodiment shown in fig. 3, the backup heat exchanger is a seawater heat exchanger 23. The water inlet pipeline of the electrode hot water boiler is provided with a doser 24 and a sampler 25. A pressure reduction device, a valve control unit and a filter device 10 are also arranged between the user load bus 12 and the electrode hot water boiler; the valve control unit comprises a valve control cabinet, a silicon controlled controller and a load reactor.
The load real-time compensation device is provided with a PLC control system communication interface, data information of a pressure gauge 19, a flow switch 20, a temperature switch 17, a pressure switch 18, a temperature transmitter 16, a flow transmitter 21 and a thermometer 22 in the system is transmitted to the PLC, and the PLC system can carry out remote operation and data sharing on equipment and can switch field operation and independent operation.
The PLC control system provides a starting signal after the auxiliary engine signal, the temperature, the pressure and the running state safety detection of each point are completed, the power supply for the electrode hot water boiler is controlled, and when the temperature and the pressure are detected to be close to set values, the upper computer adjusts the load consumption of the electrode hot water boiler according to the set values, such as opening a seawater heat exchanger or reducing the power supply power. If the temperature is not controlled in the safe range by corresponding adjustment, the electrode hot water boiler provides alarm values of limit temperature and limit pressure, and the load real-time compensation device gives a protection tripping signal in a hard wiring mode.
As shown in fig. 4, a curve a is a dynamic change condition of the total impact load, and the present invention collects a total impact load sampling value by using the dynamic load collection module, and obtains a total power deviation value according to the power reference value and the total impact load sampling value, thereby obtaining a power output instruction value of the load real-time compensation device. The compensation power controller tracks and regulates the pressure of the electrode hot water boiler according to the power output instruction value, and increases the electric load of the electrode hot water boiler when the load of a user load bus is small as shown by a curve B; when the load of a user load bus is large, the electric load of the electrode hot water boiler is reduced, so that the total load capacity of the power grid is stable and controllable, as shown by a curve C, the total load capacity of the power grid is stable and balanced after compensation, and the total load capacity of the power grid can be completely kept in the frequency modulation capacity range of the generator.
Claims (2)
1. An automatic balancing device for impact load of a power grid comprises an automatic control device and a real-time load compensation device, wherein the real-time load compensation device comprises an electrode hot water boiler (5), a heat storage tank (11), a heat exchanger and a circulating pump (8); the automatic control device comprises a dynamic load acquisition and analysis module (9) and a compensation power controller (7); the dynamic load acquisition and analysis module is connected to a user load bus of a power grid, and the compensation power controller is connected to the electrode hot water boiler; the primary loop of the heat exchanger is communicated with the water inlet and the water outlet of the electrode hot water boiler, and the secondary loop of the heat exchanger is connected to a water supply circulating system of the power grid boiler or an external cooling circulating water system; the system is characterized in that the heat exchanger comprises a condensate water heat exchanger (6) and a standby heat exchanger (15), a secondary loop of the condensate water heat exchanger is connected to a water supply circulating system of the power grid boiler, and a secondary loop of the standby heat exchanger is connected to a cooling circulating water system of the power grid steam turbine (2).
2. A method for automatically balancing impact load of a power grid is characterized by comprising the following steps:
1) numerical value sampling:
step 1-1, collecting a user total load sampling value in a power grid by a dynamic load collection and analysis module;
step 1-2, the dynamic load acquisition and analysis module compares the total load sampling value with a set initial value for operation to obtain a total power deviation value, and further obtain a power output instruction value of the load real-time compensation device;
2) pressure regulation:
step 2-1: the compensation power controller regulates the pressure of an electrode hot water boiler of the load real-time compensation device according to the power output instruction value; when the load of a user load bus is small, the electricity load consumption of the electrode hot water boiler is increased; when the load of a user load bus is large, the electric load consumption of the electrode hot water boiler is reduced;
3) water circulation:
step 3-1, feeding water with higher temperature into a heat storage tank after being heated by an electrode hot water boiler, and then transferring heat energy to a water supply system of a power grid boiler through a heat exchanger; or,
and 3-2, feeding the water with higher temperature into a heat storage tank after being heated by the electrode hot water boiler, and then transferring the excess heat energy to an external cooling circulating water system through a heat exchanger.
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| CN201310577798.1A CN103633644B (en) | 2013-11-19 | 2013-11-19 | Power grid impact load automatic balancing device and balancing method |
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| CN201310577798.1A CN103633644B (en) | 2013-11-19 | 2013-11-19 | Power grid impact load automatic balancing device and balancing method |
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| CN103633644B true CN103633644B (en) | 2015-06-24 |
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| CN107529234A (en) * | 2017-09-20 | 2017-12-29 | 赫普科技发展（北京）有限公司 | A kind of electric boiler power regulating system and method |
| CN107785932B (en) * | 2017-11-06 | 2019-12-10 | 南京国电南自电网自动化有限公司 | Energy real-time balance control system based on phase change heat storage and control method thereof |
| CN108415486B (en) * | 2018-01-16 | 2020-07-14 | 南京友智科技有限公司 | Dynamic adjusting method for power of high-voltage electrode boiler |
| CN108534113A (en) * | 2018-04-28 | 2018-09-14 | 赫普科技发展（北京）有限公司 | A kind of load side electric heat storage boiler frequency modulation system and method |
| CN110323761B (en) * | 2019-06-26 | 2023-08-18 | 海南电网有限责任公司 | Method for coping with impact of load jump high-capacity unit on power grid |
| CN112283687A (en) * | 2020-10-15 | 2021-01-29 | 中国能源建设集团广东省电力设计研究院有限公司 | Steam return water exchange system |
| CN112671012A (en) * | 2020-12-25 | 2021-04-16 | 浙江浙能迈领环境科技有限公司 | Electric power stabilizing device suitable for offshore floating power station and application |
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| CN102494430B (en) * | 2011-10-23 | 2014-11-05 | 西安交通大学 | Cold-electricity cogeneration system comprising wind power and gas combined cycle unit and method for scheduling cold-electricity cogeneration system |
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