CN209881412U - O-type load power supply system of thermal power plant - Google Patents
O-type load power supply system of thermal power plant Download PDFInfo
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- CN209881412U CN209881412U CN201920928597.4U CN201920928597U CN209881412U CN 209881412 U CN209881412 U CN 209881412U CN 201920928597 U CN201920928597 U CN 201920928597U CN 209881412 U CN209881412 U CN 209881412U
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Abstract
The utility model discloses an O-type load power supply system of a thermal power plant, which comprises an energy storage device, an AC uninterrupted load low-voltage distribution device, an AC security load low-voltage distribution device and a DC security load DC distribution device; an AC non-power-off load bus, an AC security load bus and a DC security load bus are respectively arranged in the AC non-power-off load low-voltage distribution device, the AC security load low-voltage distribution device and the DC security load DC distribution device; the energy storage device is respectively connected with the AC uninterrupted load bus, the AC security load bus and the DC security load bus through a first switch, a second switch and a third switch; the alternating current uninterrupted load bus is further connected with a first power supply for power plant service through a fourth switch, and the alternating current security load bus is further connected with a second power supply for power plant service through a fifth switch. The system is intensive and simple, and compared with a conventional method, the reliability of the O-type load power supply of the thermal power plant is improved by the all-static equipment, the power supply quality is improved, and the pollutant emission is reduced.
Description
Technical Field
The utility model belongs to thermal generator set supplies the distribution field, relates to a thermal power plant O class load power supply system.
Background
The O-class power load of the power plant comprises OI class, OII class and OIII class. OI is an alternating current uninterrupted load, OII is a direct current security load, and OIII is an alternating current security load. The specific load operation characteristics and power supply requirements are as follows:
the load of OI type means a load which needs to be continuously supplied with power during the running period of the generator set and the boiler, and during the shutdown (including accident shutdown) of the generator set and the boiler, even in a period of time after the shutdown, and is called a non-power-outage load; the system comprises a computer control system of the unit, a thermotechnical protection device, an automatic control and adjustment device, an electric actuating mechanism and a communication device.
The OII and OIII loads mean loads which need to continuously operate for power supply during power failure in order to ensure the safe shutdown of a machine furnace and restart the machine furnace soon after the shutdown of the whole plant or to prevent the loss of service power of a unit generating set and a boiler or the like, and are called accident safety loads. The OII load is a direct-current security load and comprises a main system direct-current oil pump, a direct-current cooling fan, a direct-current shutdown cooling water pump and a communication power supply. The OIII loads are AC safety loads and comprise an AC accident oil pump, an AC cooling fan, a turning gear motor, an elevator, accident lighting, a valve group, a UPS and the like.
In a conventional thermal power plant, a large-scale alternating-current uninterrupted power supply system (UPS) is adopted and is an OI type load power supply; adopting a 220V direct current lead-acid storage battery or a nickel-hydrogen storage battery pack as an OII type load power supply; a diesel generating set is adopted as an OIII type load power supply, and the type of the power supply is complex; meanwhile, the O-type load power supply system of the thermal power plant has the advantages of large quantity of equipment, numerous and complicated power distribution systems and wiring lines, large occupied area, many auxiliary equipment, high system manufacturing cost, large maintenance workload, emission of considerable amount of gas environmental pollutants and noise pollution, general overall operation reliability and large electric energy quality fluctuation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a thermal power plant O class load power supply system.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a kind of thermal power plant O load power supply system, including energy storage device, AC load low-voltage distribution device that does not stop power supply, AC security load low-voltage distribution device and direct current security load direct-current distribution device; an AC non-power-off load bus, an AC security load bus and a DC security load bus are respectively arranged in the AC non-power-off load low-voltage distribution device, the AC security load low-voltage distribution device and the DC security load DC distribution device; the energy storage device is respectively connected with the AC uninterrupted load bus, the AC security load bus and the DC security load bus through a first switch, a second switch and a third switch; the alternating current uninterrupted load bus is further connected with a first power supply for power plant service through a fourth switch, and the alternating current security load bus is further connected with a second power supply for power plant service through a fifth switch.
The utility model discloses further improvement lies in:
the alternating current uninterrupted load low-voltage distribution device also comprises a first closing synchronization device and at least three voltage transformers; the primary side end of the first voltage transformer is connected with one side of the first switch connected with the energy storage device, and the secondary side end of the first voltage transformer is connected with the input end of the first closing synchronization device; the primary side end of the second voltage transformer is connected with one side of the fourth switch connected with the first power supply for service of the thermal power plant, and the secondary side end of the second voltage transformer is connected with the input end of the first switching-on synchronization device; the primary side ends of the other voltage transformers are connected with an alternating current uninterrupted load bus, and the secondary side ends of the other voltage transformers are connected with the input end of the first closing synchronization device; two output ends of the first closing synchronization device are respectively connected with the first switch and the fourth switch.
The AC uninterrupted load low-voltage distribution device also comprises a plurality of AC uninterrupted load bus control switches; one end of the AC uninterrupted load bus control switch is connected with the AC uninterrupted load bus, and the other end of the AC uninterrupted load bus control switch is connected with the AC uninterrupted load equipment of the thermal power plant.
The alternating-current security load low-voltage distribution device also comprises a second closing synchronization device and at least three voltage transformers; the primary side end of the third voltage transformer is connected with one side of the second switch connected with the energy storage device, and the secondary side end of the third voltage transformer is connected with the input end of the second closing synchronization device; a primary side end of the fourth voltage transformer is connected with one side of the fifth switch connected with the second power supply for service of the thermal power plant, and a secondary side end of the fourth voltage transformer is connected with an input end of the second switching-on synchronization device; the primary side ends of the other voltage transformers are connected with an alternating-current security load bus, and the secondary side ends of the other voltage transformers are connected with the input end of the first closing synchronization device; two output ends of the second closing synchronization device are respectively connected with the second switch and the fifth switch.
The alternating current security load low-voltage distribution device also comprises a plurality of alternating current security load bus control switches; one end of the AC safety load bus control switch is connected with the AC safety load bus, and the other end is connected with the AC safety load equipment of the thermal power plant.
The energy storage device is a lithium iron phosphate energy storage device.
The energy storage device comprises a lithium iron phosphate battery pack, a battery control cabinet and two bidirectional power control systems; one end of the battery control cabinet is connected with the third switch and the two bidirectional power control systems, and the other end of the battery control cabinet is connected with the lithium iron phosphate battery pack; the first bidirectional power control system is connected with the AC uninterrupted load low-voltage distribution device through a first switch, and the second bidirectional power control system is connected with the AC security load low-voltage distribution device through a first switch; the first bidirectional power control system and the second bidirectional power control system are connected.
The energy storage device also comprises a monitoring protection module DCPS; the monitoring protection module DCPS is connected with the lithium iron phosphate battery pack, the battery control cabinet and the two bidirectional power control systems, and is used for monitoring the working states of the lithium iron phosphate battery pack, the battery control cabinet and the two bidirectional power control systems and carrying out data interaction with the centralized control system.
The third switch is a single-pole double-throw switch; two fixed ends of the single-pole double-throw switch are respectively connected with the energy storage device through a lead, and one movable end of the single-pole double-throw switch is connected with the direct-current safety load bus.
The direct-current security load direct-current power distribution device also comprises a plurality of direct-current security load bus control switches; one end of the direct current security load bus control switch is connected with the direct current security load bus, and the other end of the direct current security load bus control switch is connected with direct current security load equipment of the thermal power plant.
Compared with the prior art, the utility model discloses following beneficial effect has:
under the normal operation condition, supplying power to the alternating current uninterrupted load bus and the alternating current security load bus through the cable by using a first power supply for service power of the thermal power plant and a second power supply for service power of the thermal power plant, and charging the energy storage device through the alternating current uninterrupted load bus and the alternating current security load bus; when the first power supply and the second power supply for the service power of the thermal power plant are out of normal states in a fault, the system rapidly switches working modes, the energy storage device performs discharging operation, power is supplied to the alternating-current uninterrupted load bus, the alternating-current safety load bus and the direct-current safety load bus, and O-type load power supply of the thermal power plant is guaranteed. The utility model discloses only through one set of energy memory, can realize the power supply of thermal power plant O class load, with the conventional distribution system who comprises diesel generating set, DC storage battery, UPS partition device in bulk, the integration is one set of integrated device, the wiring is succinct reliable, the work switching speed is fast, improves the reliability of thermal power plant O class load power greatly.
Furthermore, the bidirectional power control system has two working modes of rectification-charging and inversion-discharging, monitors the running state of system equipment in real time, can instantly complete the switching of rectification-charging and inversion-discharging according to the running requirements of the system, and has the advantages of high response speed, good power supply continuity and small switching impact.
Furthermore, a plurality of AC uninterrupted load bus control switches and a plurality of AC safety load bus control switches are arranged, and the AC uninterrupted load bus and the AC safety load bus can be started, stopped and operated in sections by opening/closing the AC uninterrupted load bus control switches and the AC safety load bus control switches.
Furthermore, the safe reliability of O-type load power supply of a thermal power plant is solved by using a set of lithium iron phosphate energy storage device, the system is intensive and compact, and the lithium iron phosphate battery pack is used as an energy storage element, so that the lithium iron phosphate battery pack has the advantages of long service life, high energy storage speed, large capacity, environmental friendliness, no toxicity, no pollution, wide raw material source, low price and strong load carrying capacity; the power supply of the thermal power plant O-type load power supply is guaranteed, the reliability of the power supply is greatly improved, the switching time is millisecond level, the quick start is facilitated, and the electric energy quality, the operation economy and the pollutant discharge of the power supply are all better than those of the conventional scheme at present.
Furthermore, the third switch is a single-pole double-throw switch, when power maintenance is needed, different branches of the energy storage device connected with the third switch are switched, so that maintenance of the corresponding power pack can be performed, and meanwhile, continuous operation of the direct-current security load is guaranteed.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Wherein: 1-an energy storage device; 2-alternating current load low-voltage distribution device without power failure; 3-ac safety load low voltage distribution device; 4-dc safety load dc distribution devices; 5-a first power supply for auxiliary power of a thermal power plant; 6-a second auxiliary power supply of the thermal power plant; 11-a battery control cabinet; 12-lithium iron phosphate battery pack; 13-a bidirectional power control system; 14-monitoring the protection module DCPS; 21-alternating current uninterrupted load bus; 31-ac safety load bus; 41-DC safety load bus; 1PT, 2PT, 3PT, 4PT, nPTh and mPT are all voltage transformers; 1ZKK, 2ZKK, 3ZKK, 4ZKK, 1DKK, nDKK, mAKK and nAKK are all switches.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the utility model discloses a thermal power plant O-class load power supply system, including an energy storage device 1, an ac uninterruptible load low voltage distribution device 2, an ac security load low voltage distribution device 3 and a dc security load dc distribution device 4; an AC non-power-off load bus 21, an AC security load bus 31 and a DC security load bus 41 are respectively arranged in the AC non-power-off load low-voltage distribution device 2, the AC security load low-voltage distribution device 3 and the DC security load DC distribution device 4; the energy storage device 1 is respectively connected with the AC uninterrupted load bus 21, the AC security load bus 31 and the DC security load bus 41 through a first switch, a second switch and a third switch; the AC uninterrupted load bus 21 is also connected with the first power supply 5 for service of the thermal power plant through a fourth switch, and the AC uninterrupted load bus 31 is also connected with the second power supply 6 for service of the thermal power plant through a fifth switch.
The energy storage device 1 is a lithium iron phosphate energy storage device and comprises a lithium iron phosphate battery pack 12, a battery control cabinet 11, two bidirectional power control systems 13 and a monitoring protection module DCPS 14; one end of the battery control cabinet 11 is connected with a third switch and two bidirectional power control systems 13, and the other end is connected with the lithium iron phosphate battery pack 12; the first bidirectional power control system is connected with the AC uninterrupted load low-voltage distribution device 2 through a first switch, and the second bidirectional power control system is connected with the AC security load low-voltage distribution device 3 through a first switch; the first bidirectional power control system and the second bidirectional power control system are connected.
The alternating current uninterrupted load low-voltage distribution device 2 further comprises a first closing synchronization device, a plurality of alternating current uninterrupted load bus control switches and at least three voltage transformers; the primary side end of the first voltage transformer is connected with one side of the first switch connected with the energy storage device 1, and the secondary side end of the first voltage transformer is connected with the input end of the first closing synchronization device; the primary side end of the second voltage transformer is connected with one side of the fourth switch connected with the first power supply 5 for service of the thermal power plant, and the secondary side end of the second voltage transformer is connected with the input end of the first switching-on synchronization device; the primary side ends of the other voltage transformers are connected with an alternating current uninterrupted load bus 21, and the secondary side ends of the other voltage transformers are connected with the input end of the first closing synchronization device; two output ends of the first closing synchronization device are respectively connected with the first switch and the fourth switch. One end of the AC uninterrupted load bus control switch is connected with the AC uninterrupted load bus 21, and the other end is connected with the AC uninterrupted load equipment of the thermal power plant.
The alternating-current security load low-voltage distribution device 3 also comprises a second closing synchronization device, a plurality of alternating-current security load bus control switches and at least three voltage transformers; the primary side end of the third voltage transformer is connected with one side of the second switch connected with the energy storage device 1, and the secondary side end of the third voltage transformer is connected with the input end of the second closing synchronization device; the primary side end of the fourth voltage transformer is connected with one side of the fifth switch connected with the second power supply 6 for service of the thermal power plant, and the secondary side end of the fourth voltage transformer is connected with the input end of the second switching-on synchronization device; the primary side ends of the other voltage transformers are connected with an alternating current security load bus 31, and the secondary side ends of the other voltage transformers are connected with the input end of the first closing synchronization device; two output ends of the second closing synchronization device are respectively connected with the second switch and the fifth switch. One end of the AC safety load bus control switch is connected with the AC safety load bus 31, and the other end is connected with the AC uninterrupted load equipment of the thermal power plant.
The direct-current security load direct-current distribution device 4 further comprises a plurality of direct-current security load bus control switches, one end of each direct-current security load bus control switch is connected with a direct-current security load bus 41, and the other end of each direct-current security load bus control switch is connected with direct-current security load equipment of a thermal power plant.
Closing synchronization device: the synchronous closing device monitors the voltage value, the voltage frequency and the current waveform of circuits on two sides of a switch to be closed, only when the voltage difference, the frequency difference and the waveform difference on the two sides are within an allowable range or one side of the switch is in a non-voltage state, closing can be operated, otherwise, a closing loop of the switch is locked, operation is not allowed, and the situation that the voltage difference on the two sides is too large, so that overvoltage is impacted by closing, and equipment is damaged or the safety is not reached is prevented.
Bidirectional power control system: based on a rectification-inversion loop formed by the power electronic silicon controlled rectifier controlled by the computer, the power electronic silicon controlled rectifier works in a rectification mode or an inversion mode by adjusting a trigger angle of a control electrode, so that bidirectional flow conversion of electric energy is realized. The present invention is in a rectification-energy storage mode and an inversion-discharge mode. The rectification-energy storage mode is that the slave system receives alternating current, and the alternating current is converted into direct current after rectification to charge the energy storage device 1; the inversion-discharge mode is that the energy storage device 1 discharges direct current, and the direct current is inverted into 50Hz alternating current to supply power to the system.
Monitoring a protection module DCPS: the monitoring and control system based on the digital circuit can realize the monitoring of the system running state and implement the command issued by the running. The system is used for monitoring important electrical quantities such as voltage, current, stored energy and discharge time of the lithium iron phosphate battery pack 12 and monitoring the working states of the bidirectional power control system 13 and the battery control cabinet 11; and the central control room is in communication connection with the central control room through a cable, the running condition of the equipment is uploaded to the central control system, and an instruction issued by the central control system is executed.
The principle of the present invention is described in detail below:
at present, a diesel generator set is adopted as an OIII type load power supply under the restriction of manufacturing technology and cost, the capacity of a configured diesel generator is limited, the concentrated load loading capacity is insufficient, the starting time after load switching is long, the operation is unstable, the fluctuation is large, and the voltage quality is not high; the reliability of the quick investment is not high, and the starting may fail or the starting process is too slow; the running economy is not good, and the diesel generator eliminates oil and lubricating oil, and has waste gas and noise pollution. A large alternating current uninterrupted power supply system (UPS) is used as an OI type load power supply; the technical scheme is that a 220V direct-current lead-acid storage or nickel-hydrogen storage battery pack is adopted as an OII type load power supply, and the problems that the lead-acid storage or nickel-hydrogen storage battery pack occupies a large area, the daily operation and maintenance are labor-consuming, hydrogen or sulfuric acid gas is generated and escapes in the operation process and the like exist.
The utility model discloses thermal power plant O class load power supply system improves, improves thermal power plant O class load power supply system's reliability and operating performance. The low-voltage distribution system comprises an AC380/220 VOI alternating-current uninterrupted load low-voltage distribution device 2, a DC220V OII direct-current security load direct-current distribution device 3, an AC380/220 VOII alternating-current security load low-voltage distribution device 3, an energy storage device 1 and electrical connecting cables among the devices. Under the normal operation condition, the first power supply 5 and the second power supply 6 for the thermal power plant are led from the power generators, alternating current power flows from the first power supply 5 and the second power supply 6 for the AC380/220V thermal power plant to the AC380/220V OI AC uninterruptible load bus 21 and the AC380/220V OIII AC safety load bus 31, the AC uninterruptible load bus 21 and the AC safety load bus 31 are in power receiving operation, the alternating current uninterruptible load and the OIII AC safety load are supplied to the thermal power plant OI AC uninterruptible load and the OIII AC safety load, and the energy storage device 1 is charged through the electrical circuits L1 and L2. The bidirectional power control system 13 performs rectification operation, and the battery control cabinet 11 performs floating charging on the lithium iron phosphate battery pack 12. Direct current power supplies L3 and L4 are led from the battery control cabinet 11 and are connected with a DC220V OII direct current security load bus 41 through a single-pole double-throw switch 1DKK, and the direct current security load bus 41 is in power receiving operation and supplies power to OII direct current security loads of the thermal power plant. And the bus branch switches mAKK, nAKK and nDKK can be closed/opened, and the O-type load can be started to run or disconnected.
The AC380/220V OI low-voltage distribution device 2 comprises an AC380/220V primary power supply 6 of the thermal power plant and an L1 branch of an energy storage device 1 which are connected in parallel with each other and are connected to the AC380/220V low-voltage distribution device 2 through a closing synchronization device mTQJ (first closing synchronization device). The AC non-stop load low-voltage distribution device 2 is internally provided with an AC380/220V OI AC non-stop load bus 21, an AC380/220V thermal power plant power first power supply 5 is connected with the AC380/220V OI AC non-stop load bus 21 through a switch 2ZKK (a fourth switch), and an L1 branch of the energy storage device 1 is connected with the AC380/220V OI AC non-stop load bus 21 through a switch 1ZKK (a first switch).
The AC380/220V OIII alternating-current security load low-voltage power distribution device 3 and an AC380/220V thermal power plant service secondary power supply 6 which are connected in parallel with each other and are connected to the alternating-current security load low-voltage power distribution device 3 through a closing synchronization device nTQJ (second closing synchronization device) and an L2 branch of the energy storage device 1. The AC safety load low-voltage distribution device 3 is provided with an AC380/220V OIII AC safety load bus, an AC380/220V thermal power plant service power second power supply 6 is connected with the AC380/220V OIII AC safety load bus 31 through a switch 4ZKK (a fifth switch), and an L2 branch of the energy storage device 1 is connected with the AC380/220V OIII AC safety load bus 31 through a switch 3ZKK (a second switch).
The DC220V OII DC safety load DC distribution device 4 and two DC power branches of L3 and L4 of the energy storage device 1 connected to the DC safety load DC distribution device 4 through a single-pole double-throw switch 1DKK (third switch), and a DC220V OII DC safety load bus 41 is arranged in the DC safety load DC distribution device 4.
An L1 branch of the energy storage device 1 is connected with an AC380/220 VOI alternating current uninterrupted load bus 21 through a switch 1ZKK, a primary side end of a voltage transformer 1PT (a first voltage transformer) is connected between the L1 branch of the energy storage device 1 and the switch 1ZKK in a bypassing manner, a secondary side end of the voltage transformer 1PT is connected to a switching-on synchronous device mTQJ, and an output end of the switching-on synchronous device mTQJ controls the switch 1 ZKK. The first power supply 5 for the industrial power of the thermal power plant with the voltage of AC380/220V is connected with an AC380/220V OI uninterrupted current load bus through a switch 2ZKK, a primary side end of a voltage transformer 2PT (a second voltage transformer) is connected between the first power supply 5 for the industrial power of the thermal power plant and a switch 2ZKK, a secondary side end of the voltage transformer 2PT is connected to a simultaneous closing device mTQJ, and an output end of the simultaneous closing device mTQJ controls a switch 2 ZKK. The AC380/220 VOI AC uninterrupted load bus 21 is connected with the primary side end of a voltage transformer mPT, and the secondary side end of a voltage transformer mPT is connected with one input end of a closing synchronization device mTQJ.
An L2 branch of the energy storage device 1 is connected with an AC380/220V OIII alternating-current security load bus 31 through a switch 3ZKK, a primary side end of a voltage transformer 3PT (a third voltage transformer) is connected between an L2 branch of the energy storage device 1 and the switch 3ZKK in a bypassing mode, a secondary side end of the voltage transformer 3PT is connected to a closing synchronization device nTQJ, and one output end of the closing synchronization device nTQJ controls the switch 3 ZKK. The AC380/220V thermal power plant service secondary power supply 6 is connected with an AC380/220V OIII alternating current security load bus through a switch 4ZKK, a primary side end of a voltage transformer 4PT (a fourth voltage transformer) is connected between the thermal power plant service secondary power supply 6 and a switch 4ZKK, a secondary side end of the voltage transformer 4PT is connected to a closing synchronization device nTQJ, and an output end of the closing synchronization device TQnJ controls a switch 4 ZKK. The AC security load bus 31 is connected with the primary side end of the voltage transformer nPT, and the secondary side end of the voltage transformer nPT is connected with one input end of the closing synchronization device nTQJ.
Two direct current power supply branches L3 and L4 of the energy storage device 1 are connected with a DC220V OII direct current security load bus 41 through a single-pole double-throw switch 1 DKK.
The energy storage device 1 adopts a lithium iron phosphate energy storage device, and comprises a bidirectional power control system 13, a battery control cabinet 11, a lithium iron phosphate battery pack 12 and an intelligent monitoring protection module DCPS14 which are connected with each other. The energy storage device 1 comprises two sets of bidirectional power control systems 13, an outlet end of an alternating current side of a first bidirectional power control system is an L1 branch of the energy storage device 1, an outlet end of an alternating current side of a second bidirectional power control system is an L2 branch of the energy storage device 1, and direct current sides of the two bidirectional power control systems 13 are connected to the battery control cabinet 11. Under the energy storage working condition, the bidirectional power control system 13 receives alternating current electric energy from an external power supply, and charges and stores energy to the lithium iron phosphate energy storage device after rectification. Under the discharge working condition, the bidirectional power control system 13 receives direct-current electric energy from the lithium iron phosphate energy storage device, and outputs alternating-current electric energy to the outside after rectification. The battery control cabinet 11 is connected with the lithium iron phosphate battery pack 12, and the battery control cabinet 11 performs charging and discharging operations on the lithium iron phosphate battery pack according to operation requirements to monitor the operation working condition and the equipment state of the direct current system. The battery control cabinet 11 outputs L3 and L4, two DC power branches are connected to the DC220V OII DC crowbar 41. The monitoring protection module DCPS14 monitors and controls the whole system to operate in a program control mode, protects system equipment and elements, and monitors the working states of the bidirectional power control system 13 and the battery control cabinet 11 by sampling and measuring important electrical quantities such as voltage, current, stored energy, discharge time and the like of the lithium iron phosphate battery pack 12; and the central control room is in communication connection with the central control room through a cable, the running condition of the equipment is uploaded to the central control system, and an instruction issued by the central control system is executed.
The distribution device adopts a hard copper conductor bus, a plurality of air circuit breakers are configured to serve as a power switch of an O alternating current uninterrupted load in a thermal power plant, the bus is connected with a switch and a voltage transformer through hard copper conductors, the distribution device is arranged in a special distribution room, heating, ventilation, illumination and maintenance hoisting facilities are arranged in the distribution room, and instruments, control, protection and automatic devices are arranged in a distribution device cabinet body. The lithium iron phosphate energy storage device is assembled in the container type metal box body, and is provided with heating, ventilating, illuminating, overhauling and hoisting facilities, so that the device is firm and straight, the size of the embedded part is accurate, and the equipment foundation meets the equipment load requirement.
The following is the utility model discloses thermal power plant O class load power supply system's theory of operation carries out detailed explanation.
Under the normal operation working condition, the first power supply 5 and the second power supply 6 for the service power of the thermal power plant are derived from the generator, and supply power to the O-type load bus through the cable to charge the lithium iron phosphate energy storage device. The method comprises the steps that a 2ZKK switch two-test voltage is subjected to closing synchronization verification by a closing synchronization device mTQJ, then closing operation is carried out, alternating current energy flows from an AC380/220V thermal power plant power first power supply 5 to an AC380/220V OI alternating current uninterrupted load bus 21, and the alternating current uninterrupted load bus 21 flows to be in power receiving operation and is supplied to an OI alternating current uninterrupted load of the thermal power plant. And the switch mAKK is closed/opened, so that the OI alternating current uninterrupted load can be started to run or disconnected and stopped. The switching-on synchronization device mTQJ performs switching-on operation after the switching-on synchronization verification of the two-voltage detection of the 1ZKK switch, alternating current electric energy charges the energy storage device 1 from a bus through the 1ZKK switch, the L1 line and the first bidirectional power control system, and the first bidirectional power control system performs rectification operation.
Similarly, the closing synchronization device nTQJ performs closing operation after closing synchronization verification on two voltages measured by the 4ZKK switch, alternating current power flows from the AC380/220V thermal power plant service second power supply 6 to the AC380/220V OIII alternating current security load bus 31, and the alternating current security load bus 31 is in power receiving operation and is supplied to the OIII alternating current security load of the thermal power plant. And the switch nAKK is closed/opened, so that the OIII alternating-current security load can be started to run or disconnected to stop. And the closing synchronization device nTQJ performs closing operation after closing synchronization verification on two voltages measured by the 3ZKK switch, the alternating current electric energy charges the energy storage device 1 from the bus through the 3ZKK switch, the L2 line and the second bidirectional power control system, and the second bidirectional power control system performs rectification operation.
The energy storage device 1 is charged, and the battery control cabinet 11 charges the lithium iron phosphate battery pack 12 in a floating manner. The direct-current power supply branches L3 and L4 led from the battery control cabinet 11 are connected with a DC220V OII direct-current security load bus 41 through a single-pole double-throw switch 1DKK, and the single-pole double-throw switch 1DKK can be put into any branch of L3 or L4 when being normal. Direct current power flows from the lithium iron phosphate battery pack 12 to the DC220V OII direct current safety load bus 41, and the direct current safety load bus 41 is powered on to run and supplies power to OII direct current safety loads of the thermal power plant. And the on/off switch nDKK can be closed to start operation or cut off to stop OII direct current security load. When the direct-current power supply needs maintenance and overhaul, the L3 and the L4 can be powered off in turn through switching operation of the 1DKK switch, and corresponding maintenance work is carried out.
When the system fails to work normally, the system quickly switches the working mode according to the change of the monitoring data and the setting of the program, and the energy storage device 1 performs discharging operation. The direct current electric energy is inverted into alternating current electric energy from the lithium iron phosphate battery pack 12 through the bidirectional power control system 13, and flows to the AC380/220V OI alternating current uninterrupted load bus 21 and the AC380/220V OIII alternating current safety load bus 31. The lithium iron phosphate battery pack 12 outputs direct current electric energy to the DC220V OII direct current safety load bus 41 through the battery control cabinet 11. So as to ensure that the O-type load of the thermal power plant can continuously operate. The method comprises the following steps:
when a voltage transformer 2PT on one side of a first power supply 5 for power plant of an AC380/220V thermal power plant monitors that the terminal voltage is reduced to 80% or below a normal voltage, a first bidirectional power control system of an L1 circuit of an energy storage device 1 is immediately switched to an inversion discharge mode, direct current of a lithium iron phosphate battery pack 12 is inverted into power frequency alternating current, power is supplied to an AC380/220V OI uninterrupted power load bus 21, and uninterrupted continuous operation of an OI uninterrupted power load of the thermal power plant is maintained; meanwhile, the synchronous device mTQJ tripping action at low voltage instantly switches off the 2ZKK switch, and the monitoring protection module DCPS14 sends an alarm signal to the centralized monitoring of the thermal power plant.
When a voltage transformer 4PT on one side of an auxiliary power supply 6 of the AC380/220V thermal power plant monitors that the terminal voltage is reduced to 60% or below a normal voltage, a second bidirectional power control system of an L2 circuit of the energy storage device 1 is immediately switched to an inversion discharge mode, direct current of the lithium iron phosphate battery pack 12 is inverted into power frequency alternating current, power is supplied to an AC380/220V OIII alternating current security load bus 31, and continuous operation of OIII alternating current security loads of the thermal power plant is maintained; meanwhile, the low-voltage tripping action of the synchronous device nTQJ instantaneously turns off the 4ZKK switch, and the monitoring protection module DCPS14 sends an alarm signal to the centralized monitoring of the thermal power plant.
When the service power is recovered from the fault and the normal power supply is recovered, a voltage transformer 2PT on one side of a first service power supply 5 of the AC380/220V thermal power plant monitors that the end voltage rises to 80% or above of the normal voltage, a closing synchronization device mTQJ performs closing synchronization verification on the voltage on two sides of a switch 2ZKK and then performs closing operation, alternating current power flows from the first service power supply 5 of the AC380/220V thermal power plant to an AC380/220V OI uninterrupted load bus 21, the AC uninterrupted load bus 21 is in powered operation and supplies AC uninterrupted load to the OI of the thermal power plant, the energy storage device 1 is charged through a switch 1ZKK, an L1 line and a first bidirectional power control system, and the first bidirectional power control system performs rectification operation. A voltage transformer 4PT on one side of an auxiliary power second power supply 6 of an AC380/220V thermal power plant monitors that end voltage rises to 80% or above of normal voltage, a closing synchronization device nTQJ performs closing synchronization verification on voltages on two sides of a 4ZKK switch, then, switching-on operation is performed, alternating current power flows from the auxiliary power second power supply 6 of the AC380/220V thermal power plant to an AC380/220V OIII alternating current security load bus 31, the alternating current security load bus 31 is in power receiving operation and supplies power to OIII alternating current security loads of the thermal power plant, the OIII alternating current security loads are charged to an energy storage device 1 through a 3ZKK switch, an L2 line and a second bidirectional power control system, and the second bidirectional power control system performs rectification operation.
The utility model discloses O class load power supply system of thermal power plant, under normal operating condition, the first power supply 5 of the service power of thermal power plant and the second power supply 6 of the service power of thermal power plant originate from the generator, supply power to O class load bus through the cable, charge to the lithium iron phosphate energy storage device; the system loses a normal factory working power supply when in fault, the working mode is rapidly switched according to the change of monitoring data and the setting of a program, the energy storage device 1 performs discharge operation, the system is simple and reliable in wiring, the energy storage device is large in capacity, and the work switching speed is extremely high, so that the reliability of the O-type load power supply of the thermal power plant is greatly improved. The lithium iron phosphate energy storage device is adopted to form an O-type load power supply system of the thermal power plant, a set of lithium iron phosphate energy storage device is used for solving the problem of safe reliability of the O-type load power supply of the thermal power plant, and the system is intensive and simple; the static power electronic bidirectional power control system has the advantages of high response speed and high power supply quality; the lithium iron phosphate battery pack is used as an energy storage element, has long service life, fast energy storage, large capacity, environmental protection, no toxicity, no pollution, wide raw material source and low price. The power supply of the O-type load power supply of the thermal power plant is ensured, and the reliability of the power supply is greatly improved. The energy storage device 1 has large capacity, strong loading capacity and millisecond switching time, is favorable for quick start, and has better electric energy quality, running economy and pollutant discharge than the conventional scheme at present.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (10)
1. A thermal power plant O-type load power supply system is characterized by comprising an energy storage device (1), an alternating current uninterrupted load low-voltage distribution device (2), an alternating current security load low-voltage distribution device (3) and a direct current security load direct current distribution device (4);
an AC non-power-off load bus (21), an AC security load bus (31) and a DC security load bus (41) are respectively arranged in the AC non-power-off load low-voltage distribution device (2), the AC security load low-voltage distribution device (3) and the DC security load DC distribution device (4); the energy storage device (1) is respectively connected with the AC uninterrupted load bus (21), the AC security load bus (31) and the DC security load bus (41) through a first switch, a second switch and a third switch;
the alternating current uninterrupted load bus (21) is further connected with a first power supply (5) for the service of the thermal power plant through a fourth switch, and the alternating current security load bus (31) is further connected with a second power supply (6) for the service of the thermal power plant through a fifth switch.
2. The thermal power plant class-O load power supply system according to claim 1, wherein said ac uninterruptible load low voltage power distribution unit (2) further comprises a first closing synchronization unit and at least three voltage transformers;
the primary side end of the first voltage transformer is connected with one side of the first switch connected with the energy storage device (1), and the secondary side end of the first voltage transformer is connected with the input end of the first closing synchronization device;
the primary side end of the second voltage transformer is connected with one side of the fourth switch connected with the first power supply (5) for service of the thermal power plant, and the secondary side end of the second voltage transformer is connected with the input end of the first closing synchronization device;
the primary side ends of the other voltage transformers are connected with an alternating current uninterrupted load bus (21), and the secondary side ends of the other voltage transformers are connected with the input end of the first closing synchronization device;
two output ends of the first closing synchronization device are respectively connected with the first switch and the fourth switch.
3. The thermal power plant O-type load power supply system according to claim 1 or 2, wherein the AC UPS low-voltage distribution device (2) further comprises a plurality of AC UPS load bus control switches;
one end of the AC uninterrupted load bus control switch is connected with an AC uninterrupted load bus (21), and the other end is connected with AC uninterrupted load equipment of the thermal power plant.
4. A thermal power plant class O load power supply system according to claim 1 or 2, characterized in that said ac security load low voltage distribution device (3) further comprises a second closing synchronization device and at least three voltage transformers;
the primary side end of the third voltage transformer is connected with one side of the second switch connected with the energy storage device (1), and the secondary side end of the third voltage transformer is connected with the input end of the second switching-on synchronization device;
the primary side end of the fourth voltage transformer is connected with one side of the fifth switch connected with the second power supply (6) for service of the thermal power plant, and the secondary side end of the fourth voltage transformer is connected with the input end of the second switching-on synchronization device;
the primary side ends of the other voltage transformers are connected with an alternating current security load bus (31), and the secondary side ends of the other voltage transformers are connected with the input end of the first closing synchronization device;
two output ends of the second closing synchronization device are respectively connected with the second switch and the fifth switch.
5. The thermal power plant class-O load power supply system according to claim 1, wherein said ac security load low voltage distribution device (3) further comprises a plurality of ac security load bus control switches;
one end of the AC safety load bus control switch is connected with an AC safety load bus (31), and the other end is connected with AC safety load equipment of a thermal power plant.
6. The thermal power plant O-type load power supply system according to claim 1, wherein the energy storage device (1) is a lithium iron phosphate energy storage device.
7. The thermal power plant class-O load power supply system according to claim 6, characterized in that the energy storage device (1) comprises a lithium iron phosphate battery pack (12), a battery control cabinet (11) and two bidirectional power control systems (13);
one end of the battery control cabinet (11) is connected with the third switch and the two-way power control systems (13), and the other end is connected with the lithium iron phosphate battery pack (12);
the first bidirectional power control system is connected with the AC uninterrupted load low-voltage distribution device (2) through a first switch, and the second bidirectional power control system is connected with the AC security load low-voltage distribution device (3) through a first switch;
the first bidirectional power control system and the second bidirectional power control system are connected.
8. The thermal power plant class-O load power supply system according to claim 7, characterized in that the energy storage device (1) further comprises a monitoring protection module DCPS (14);
the monitoring protection module DCPS (14) is connected with the lithium iron phosphate battery pack (12), the battery control cabinet (11) and the two bidirectional power control systems (13) and is used for monitoring the working states of the lithium iron phosphate battery pack (12), the battery control cabinet (11) and the two bidirectional power control systems (13) and carrying out data interaction with the centralized control system.
9. The thermal power plant class O load power supply system of claim 1, wherein said third switch is a single pole double throw switch;
two fixed ends of the single-pole double-throw switch are respectively connected with the energy storage device (1) through a lead, and one movable end of the single-pole double-throw switch is connected with the direct-current safety load bus.
10. The thermal power plant class-O load power supply system according to claim 1, wherein the DC safety load DC distribution device (4) further comprises a plurality of DC safety load bus control switches;
one end of the direct current security load bus control switch is connected with a direct current security load bus (41), and the other end of the direct current security load bus control switch is connected with direct current security load equipment of a thermal power plant.
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| CN201920928597.4U CN209881412U (en) | 2019-06-19 | 2019-06-19 | O-type load power supply system of thermal power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110137961A (en) * | 2019-06-19 | 2019-08-16 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of thermal power plant O type load power supply system and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110137961A (en) * | 2019-06-19 | 2019-08-16 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of thermal power plant O type load power supply system and control method |
| CN110137961B (en) * | 2019-06-19 | 2024-02-06 | 中国电力工程顾问集团西北电力设计院有限公司 | O-type load power supply system of thermal power plant and control method |
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