CN210246326U - Electrochemical frequency modulation power supply of thermal power plant and safety protection power supply system - Google Patents
Electrochemical frequency modulation power supply of thermal power plant and safety protection power supply system Download PDFInfo
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- CN210246326U CN210246326U CN201921521271.6U CN201921521271U CN210246326U CN 210246326 U CN210246326 U CN 210246326U CN 201921521271 U CN201921521271 U CN 201921521271U CN 210246326 U CN210246326 U CN 210246326U
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Abstract
The utility model relates to a thermal power plant's electrochemistry frequency modulation power supply is regarded as guarantor's electrical power generating system concurrently, and this system contains the frequency modulation storage battery of 1 section high pressure energy storage frequency modulation section, electrochemistry frequency modulation power supply in thermal power plant, still contains 1 security transformer and security personnel power center of every unit. The high-voltage energy storage frequency modulation band is connected with a frequency modulation storage battery pack of an electrochemical frequency modulation power supply, a circuit is led out from a high-voltage plant working section of each unit and is connected to the high-voltage energy storage frequency modulation band, a power supply is led out from the high-voltage energy storage frequency modulation band to a security protection transformer high-voltage side, and the security protection transformer low-voltage side is connected with a security protection power center. The utility model discloses utilize electrochemistry frequency modulation power to double as the guarantor's power, save security personnel diesel generating set, can improve security personnel's power reliability, reduced the maintenance work volume, can really realize not having oil power plant, have good economic benefits and social.
Description
Technical Field
The utility model relates to a safety power supply system in thermal power factory.
Background
According to GB50660-2011 design Specification of large and medium thermal power plants: 200MW and above units should be provided with an AC security power supply. The 200 MW-300 MW-level and 600 MW-1000 MW-level units are provided with alternating current security power supplies according to the units. The AC security power supply should adopt a diesel generator set which is started quickly. At present, domestic units above 300MW level are all provided with an alternating current security power supply, and most of the units are rapidly started diesel generator sets.
As shown in fig. 1, which is a traditional safety power supply wiring diagram of a power plant, each unit is provided with 1 diesel generator 12, 1 safety power center 14 and 2 safety control centers 13, the diesel generator 12 is connected with a safety power center section, and each safety control center section 13 is respectively connected with a circuit from different working power centers of the unit and is respectively connected with a power supply from the safety power center 14.
In recent years, with the rapid increase of the installed capacity of new energy, the influence of the grid connection of a large-scale new energy unit on a power grid is large. One important effect is that the frequency modulation is more difficult. Active power output by wind power and photovoltaic is mainly adjusted along with environmental changes, randomness is strong, predictability is poor, and renewable energy power plants running in China do not participate in system frequency adjustment, so that power grid frequency adjustment must be shared by traditional power plants. Along with the increase of the proportion of the installed capacity of the renewable energy in the power grid, the proportion of the capacity of the frequency modulation power supply participating in the power grid is obviously reduced, and the frequency modulation power supply with the corresponding capacity needs to be synchronously matched. The battery energy storage system has excellent quick response characteristic, so that the battery energy storage system is additionally arranged in many thermal power plants at present to participate in the frequency modulation auxiliary service of a power grid.
In order to meet the requirement of power grid frequency modulation, a policy of auxiliary frequency modulation of a thermal power generating unit is saved, an electrochemical energy storage frequency modulation system is installed in a thermal power plant with many provinces, the power of the auxiliary frequency modulation energy storage system of the thermal power generating unit is generally configured according to 3% of the load of a single unit, and the type of a battery is 2C.
SUMMERY OF THE UTILITY MODEL
The utility model solves the technical problem that an electrochemical frequency modulation power supply is used as a security power supply, thereby saving the existing diesel generator set.
The technical means adopted by the utility model are as follows.
The system comprises a frequency modulation storage battery pack of 1 section of high-voltage energy storage frequency modulation frequency band and an electrochemical frequency modulation power supply in the thermal power plant, and also comprises 2 units of unit power supplies of each unit, 1 security transformer and a security power center. The high-voltage energy storage frequency modulation band is connected with a frequency modulation storage battery pack of an electrochemical frequency modulation power supply, a circuit is led out from a high-voltage plant working section of each unit and is connected to the high-voltage energy storage frequency modulation band, a power supply is led out from the high-voltage energy storage frequency modulation band to a security protection transformer high-voltage side, and the security protection transformer low-voltage side is connected with a security protection power center.
Further, the unit also includes 2 security control centers, the 2 security control centers 13 are respectively connected with one circuit from different working power centers of the unit, and the 2 security control centers are respectively connected with one circuit from the security power centers.
The beneficial effects of the utility model are as follows.
1. The utility model discloses the technique utilizes among the thermal power factory electrochemistry energy storage frequency modulation power to double as the security power, can save security personnel diesel generating set. For the province that the thermal power generating unit participates in the auxiliary frequency modulation service policy, the electrochemical energy storage frequency modulation system can generally recover the investment in less than 2 years, the diesel generator system is saved, the investment can be saved, and the economic benefit is obvious.
2. The battery has the characteristic of quick response, and the reliability of the security power supply is greatly improved.
3. The diesel generating set needs regular maintenance, and the electrochemical energy storage frequency modulation power supply also serves as a safety power supply, so that the maintenance workload can be reduced.
4. The oil-free ignition system is adopted in the thermal power plant, but the diesel generator still needs oil, and the electrochemical energy storage frequency modulation power supply also serves as a safety power supply, so that the oil-free power plant can be really realized, and the economic benefit and the social benefit are obvious.
Drawings
Fig. 1 is a conventional safety power connection diagram of a power plant.
Fig. 2 is a wiring diagram of the electrochemical frequency modulation power supply and security power supply of the power plant of the present invention.
Detailed Description
The utility model discloses a system for utilize electrochemistry frequency modulation power supply to double as safety power supply in the unit. Fig. 2 is a wiring diagram of the electrochemical frequency modulation power supply of the power plant and also used as a security power supply, and an embodiment with 1 unit is taken as an example for explanation.
Each thermal power generating set is internally provided with 2 units of generating set power sources 21, 2 security control centers 23 and 1 security power center 24. 2 security control centers 23 are respectively led from different low-voltage working power centers of the unit to a return line, and the 2 security control centers are respectively led from the security power centers to a return line.
The system also comprises a high-voltage energy storage frequency adjusting band 26 and a security transformer 22, wherein a power supply in a security power center 24 is connected with the high-voltage energy storage frequency adjusting band 26 through the security transformer 22, the high-voltage energy storage frequency adjusting band 26 is connected with a frequency modulation storage battery pack 25 of an electrochemical frequency modulation power supply, and a circuit is led out from each high-voltage station work section of each unit to be connected with the high-voltage energy storage frequency adjusting band 26.
The generator can charge the frequency modulation storage battery pack 25 through the 2 sets of the power supply 21, and when the frequency modulation of the sets is needed, the frequency modulation storage battery pack 25 supplies power to the 2 sets of the power supply 21 in each set. When the capacity of the unit is small, the frequency modulation storage battery pack 25 can also supply power to only one unit power supply 21 in the unit. When the power is cut off in a factory accident, the frequency modulation storage battery pack 25 supplies power to the security PC section (namely, the security power center 24) through the security transformer 22 so as to ensure that security loads carried on the security MCC section (namely, the security control center 23) continuously run without power failure.
The capacity of the frequency modulation storage battery pack 25 can be set according to the actual situation by the frequency modulation storage battery pack 25 in the electrochemical frequency modulation power supply, and generally, 2 units shown in the figure share one set of frequency modulation storage battery pack 25 and a high-voltage energy storage frequency modulation band 26 to be optimal.
According to actual conditions, the units with different capacities are provided with energy storage capacities with different capacities.
For 300MW grade thermal power plant, each unit is generally provided with about 630MW fast start diesel generator system as security power supply. When the electrochemical energy storage device is used as a security power supply, the rapid discharge characteristic of the electrochemical energy storage device completely meets the speed requirement of a rapidly started diesel generator set as a security power supply. A2 x 300 MW-level unit is provided with a 9MW/4.5MWh frequency modulation storage battery pack, a thermal power generating unit is combined to develop power grid AGC frequency modulation service, the system outputs according to 9MW/2C during frequency modulation, the system generally works at 50% of storage battery capacity, namely, the electric quantity of an energy storage battery floats for a long time at about 2.25MWh, and the capacity completely meets the requirements of security power supplies of two units.
For a 2X 600 MW-class unit, the capacity of a frequency modulation energy storage battery is about 18MW/9MWh, and each unit is provided with a 1200kW diesel generator set. Considering that the frequency modulation is involved, the frequency modulation device generally works at 50% of the storage battery capacity which floats up and down, namely the electric quantity of the energy storage battery is about 4.5MWh for a long time, and the capacity completely meets the requirements of two units of security power supplies.
For a 2X 1000 MW-class unit, the capacity of a frequency modulation energy storage battery is about 24MW/12MWh, and each unit is provided with a 1800kW diesel generator set. Considering that the power supply works in frequency modulation, the power supply generally floats up and down at 50% of the capacity of the storage battery, namely the electric quantity of the energy storage battery is about 6MWh for a long time, and the capacity completely meets the requirements of security power supplies of two units.
In the operation of an electric power system, Automatic Generation Control (AGC) mainly realizes the control of the frequency of the power grid and the power of a connecting line by adjusting the active output of a frequency modulation power supply in the power grid in real time, solves the problem of active imbalance with random characteristics in a regional power grid with short time of second or minute level, and provides higher requirements on AGC power supply performance such as high regulation speed, high regulation precision, frequent power regulation direction switching and the like.
Usually, the AGC frequency modulation function of the power grid is mainly provided by hydropower, a combustion engine and a thermal power generating unit. The power supplies are all composed of mechanical devices with rotation inertia, primary energy is converted into electric energy, a series of complex processes are carried out, particularly, the AGC frequency modulation performance of a thermal power generating unit is different from the adjustment expectation of a power grid, and the phenomena of adjustment delay, deviation (overshoot and undershoot) and the like are specifically shown. For an electrochemical energy storage system, within a rated power range, the output of specified power can be completed within 1 second and with the precision of more than 99%, and the comprehensive response capability of the electrochemical energy storage system can completely meet the power conversion requirement within an AGC frequency modulation time scale. The 10MW energy storage system takes only 2 seconds from +10MW to-10 MW, i.e., for a 20MW AGC command, it can be completed in 2 seconds if energy storage technology is used. The stored AGC tracking curve almost coincides with the AGC command curve, namely, the problems of adjusting direction, adjusting deviation, adjusting delay and the like can not occur. The comprehensive AGC adjusting performance of the energy storage system is far better than that of a thermal power generating unit.
Claims (2)
1. The utility model provides a thermal power plant's electrochemistry frequency modulation power supply is regarded as guarantor's safety electrical power generating system concurrently, contains 2 unit power supplies and 1 security power center of this unit in every thermal power generating set, its characterized in that still contains high-pressure energy storage and transfers frequency channel and security transformer, high-pressure energy storage transfers the frequency channel to draw forth all the way the power extremely security transformer high-pressure side, security transformer low pressure side is connected security power center, the frequency modulation storage battery group of electrochemistry frequency modulation power is connected to high-pressure energy storage transfers the frequency channel, this high-pressure energy storage transfers the frequency channel is respectively drawn forth all the way to every section high-pressure mill with the working section.
2. The thermal power plant electrochemical frequency modulation power supply system used as a safety power supply according to claim 1, wherein the unit further comprises 2 security control centers, the 2 security control centers are respectively connected with a circuit from different low-voltage operating power centers of the unit, and the 2 security control centers are respectively connected with a circuit from the security power centers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921521271.6U CN210246326U (en) | 2019-09-12 | 2019-09-12 | Electrochemical frequency modulation power supply of thermal power plant and safety protection power supply system |
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| CN201921521271.6U CN210246326U (en) | 2019-09-12 | 2019-09-12 | Electrochemical frequency modulation power supply of thermal power plant and safety protection power supply system |
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| CN210246326U true CN210246326U (en) | 2020-04-03 |
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| CN201921521271.6U Active CN210246326U (en) | 2019-09-12 | 2019-09-12 | Electrochemical frequency modulation power supply of thermal power plant and safety protection power supply system |
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