CN101877487B - Battery energy storage power station and method for balancing power network load - Google Patents
Battery energy storage power station and method for balancing power network load Download PDFInfo
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- CN101877487B CN101877487B CN 200910136166 CN200910136166A CN101877487B CN 101877487 B CN101877487 B CN 101877487B CN 200910136166 CN200910136166 CN 200910136166 CN 200910136166 A CN200910136166 A CN 200910136166A CN 101877487 B CN101877487 B CN 101877487B
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Abstract
The invention discloses a battery energy storage power station and a method for balancing power network load. The power station comprises a battery array, a charging system, an inversion system and a monitoring and control system, wherein the charging system is used for charging the battery array by the electric energy of a power network; the inversion system is used for inputting the electric energy of the battery array to the power network; and the monitoring and control system is used for detecting the load, frequency and phase of the power network, controlling the charging system to charge the battery array when the load is smaller than a preset value, and controlling the inversion system to input the electric energy of the battery array to the power network synchronous with the frequency and phase of the power network when the load is more than or equal to the preset value, wherein the preset value is less than or equal to the capacity of the power network. The battery energy storage power station and the method for balancing power network load can effectively balance the power network load, and well solve the problem that the conventional power network cannot meet the power utilization requirement during power consumption peaks.
Description
Technical field
The present invention relates to energy-accumulating power station and method in the network system, and relate in particular to a kind of battery energy storage power station for balancing power network load and method.
Background technology
Because the fast development that industrial or agricultural is built and the raising of living standards of the people, to the demand day by day of electric power, national huge fund has been built many large small-scale thermal power plants and hydroelectric station, but still does not satisfy an urgent demand that electric load increases.
Electrical network is very unbalanced at the load of different period of every day, and evening, the 6-9 point was the peak of power consumption time period, so just need to call energy-accumulating power station for subsequent use and come to be mains supply, thereby satisfy the power supply of peak of power consumption time period.The power station of bearing at present the peak regulation task in the electrical network mainly contains coal electricity, oil electricity, water power and hydroenergy storage station.
In these storage station, the electric and oily electric energy-accumulating power station cost of coal is high, start-stop time is long, environmental pollution is more serious, and with regard to economy, fail safe and the environmental protection of power plant's operation, coal electricity and oily electric energy-accumulating power station should not be used as the variable load plant; Hydroelectric storage peak-load regulation ability is stronger, but operational resource-constrained; And large because of floor space as the hydroelectric storage power station of electrical network main force peak load stations, long in time limit, and limited by geographical conditions, its development also is subject to restriction to a certain degree.Therefore, the present a kind of novel energy-storing power station that can alleviate power shortage of exigence.
Summary of the invention
In order to solve the defective that does not have suitable energy-accumulating power station can bear the peak regulation task of peak of power consumption time period in the prior art, thus the invention provides a kind of can peak load shifting, balancing power network load reaches the novel energy-storing power station of the purpose of peak regulation.
Novel energy-storing provided by the invention power station is battery energy storage power station, and this battery energy storage power station is used for balancing power network load, and wherein, this power station comprises: array; Charging system, this charging system are used for utilizing the electric energy of electrical network that described array is charged; Inversion system, this inversion system are used for the electric energy of array is input to electrical network; Supervisory control system, for detection of load, frequency and the phase place of electrical network, and when described load during less than predetermined value, the control charging system charges to array; When described load during more than or equal to predetermined value, control described inversion system with the electric energy of array to be input to electrical network with the frequency of electrical network and the mode of phase place synchronised, described predetermined value is less than or equal to the capacity of electrical network.
In addition, the present invention also provides a kind of method of utilizing the array balancing power network load, and wherein, the method comprises: the frequency of the load of detection of grid and phase place; And when described load during less than predetermined value, utilize the electric energy of electrical network that array is charged; When described load during more than or equal to predetermined value, to be input to electrical network with the frequency of electrical network and the mode of phase place synchronised, described predetermined value is less than or equal to the capacity of electrical network with the electric energy of described array in control.
By utilizing the method for battery energy storage power station provided by the invention and balancing power network load, described supervisory control system can be controlled charging system the electric energy of electrical network is filled with in the array when network load is little, and when network load is large, control described inversion system and will be stored in electric energy in the array being discharged in the electrical network with the frequency of electrical network and the mode of phase place synchronised, thereby reached the purpose of balancing power network load.Battery energy storage power station provided by the invention has the advantage that floor space is little, cost is low, pollution-free and safe.
Description of drawings
Fig. 1 is the structural representation of battery energy storage power station provided by the invention;
Fig. 2 is the structural representation of the battery energy storage power station of one embodiment of the present invention;
Fig. 3 is the structural representation according to the battery energy storage power station of another embodiment of the invention; And
Fig. 4 is the flow chart of the method for balancing power network load provided by the invention.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing.
As shown in Figure 1, the battery energy storage power station for balancing power network load provided by the invention comprises: array 10, and this array 10 comprises a plurality of batteries in parallel connection groups; Charging system 20, this charging system 20 are used for utilizing the electric energy of electrical network to described array 10 chargings; Inversion system 30, this inversion system 30 is used for the electric energy of array 10 is input to electrical network; And supervisory control system 40, for detection of load, frequency and the phase place of electrical network, and when described load during less than predetermined value, 20 pairs of arrays 10 of control charging system charge; When described load during more than or equal to predetermined value, control described inversion system 30 with the electric energy of array 10 to be input to electrical network with the frequency of electrical network and the mode of phase place synchronised.Wherein said predetermined value can be set as the capacity that is less than or equal to electrical network.
Battery pack in the described array 10 comprises the battery of some series connection, and described battery can be the battery of iron cell (that is, ferric phosphate lithium cell, its rated voltage can be 3.2V) or other types.Described charging system 20 is used for and will be converted to direct current from the alternating current of electrical network, and utilizes this direct current to array 10 chargings.Frequency and phase place that described inversion system 30 is used for according to electrical network will be converted to from the direct current of array 10 alternating current identical with phase place with the frequency of electrical network, and this alternating current will be input to electrical network.
Because generally speaking, the electric energy on the electrical network all is high-tension electricity, and for example voltage is at 10KV or more than the 10KV, and the voltage that array 10 can bear is well below 10KV, for example 0.4KV.Therefore, under the preferable case, as shown in Figure 2, described power station also comprises charging transformer 50 and discharge transformer 60, described charging transformer 50 is used for and will be converted to low tension from the high-tension electricity of electrical network, and this low tension offered charging system 20, so that charging system 20 utilizes this low tension to array 10 chargings; Described discharge transformer 60 is used for being converted to from the low tension of inversion system 30 high-tension electricity that has with the electrical network equivalent voltage, and this high-tension electricity is input to electrical network.
Under the preferable case, as shown in Figure 3, described power station also comprises electric and relaying protection system 70, and this electric and relaying protection system 70 is for the protection of described charging transformer 50 and discharge transformer 60.The below describes described electric and relaying protection system 70 for charging transformer 50; electric and relaying protection system 70 comprises high voltage side lead-in cabinet protective device, high-pressure side outgoing line cabinet protective device, low-pressure side incoming line cabinet protective device and low-voltage side outlet cabinet protective device; wherein; described high voltage side lead-in cabinet protective device and high-pressure side outgoing line cabinet protective device are separately positioned in the on high-tension side incoming line cabinet and outgoing line cabinet of charging transformer 50, and described low-pressure side incoming line cabinet protective device and low-voltage side outlet cabinet protective device are arranged on the low-pressure side of charging transformer 50.Adopt some switching devices, lightning arrester and charged display device etc. in the described high voltage side lead-in cabinet protective device, have the function of isolated high-voltage power supply, assurance safety inspection.Described high-pressure side outgoing line cabinet protective device can adopt the CSP2000 microsystem, to realize overcurrent protection, current quick, high temperature alarm, overtemperature tripping operation, zero-sequence current protection etc.Described low-pressure side incoming line cabinet protective device and low-voltage side outlet cabinet protective device play overload long delay, short circuit instantaneous protection, are separately positioned in the incoming line cabinet and outgoing line cabinet of charging transformer 60 low-pressure sides.For described discharge transformer 60; high voltage side lead-in cabinet protective device and high-pressure side outgoing line cabinet protective device are separately positioned in the on high-tension side incoming line cabinet and outgoing line cabinet of discharge transformer 60, and described low-pressure side incoming line cabinet protective device and low-voltage side outlet cabinet protective device are separately positioned in the incoming line cabinet and outgoing line cabinet of low-pressure side of discharge transformer 60.
Generally speaking, the price of the electric energy on the electrical network can fluctuate according to operating position, and for example the 6-9 electricity price of ordering is higher at night, and 12 later electricity prices are lower at night.In order to realize best economic benefit, under the preferable case, described supervisory control system 40 can also be controlled discharging and recharging of array 10 according to electricity price, and when electricity price was low, 20 pairs of arrays 10 of control charging system charged; When described electricity price is high, controls described inversion system 30 electric energy of array 10 is input to electrical network.Can realize so low buy height and selling, make the maximum economic benefit of battery energy storage power station performance.
Under the preferable case, described supervisory control system 40 can also detect the energy storage capacity of array 10, controls charging system 20 and inversion system 30 according to the energy storage capacity that detects, so that array 10 is operated in the predetermined energy storage capacity scope.Can prevent that like this array 10 from overcharging or mistake is put.Wherein, described predetermined energy storage scope can be set according to the protection attribute of array 10 self, for example can be set as the 10%-90% of the maximum energy storage capacity of array 10.
In addition, described supervisory control system 40 can also detect the temperature of array 10, controls charging system 20 and inversion system 30 according to the temperature that detects, so that array 10 is operated in the predetermined temperature range.Can prevent that like this array 10 from damaging because of overheated, play the effect of protection array 10.Wherein, described predetermined temperature range can be set according to the protection attribute of array 10 self, as long as be lower than described array 10 because of the overheated limiting temperature of damaging, for example can be set as and be equal to or less than 50 ℃.
Under the preferable case, described supervisory control system 40 can also be come according to the load of electrical network the charge power of regulating cell array 10, to guarantee can not make the electrical network overload operation.For example, when the capacity of electrical network is 10000KW, and this moment electrical network load be 9990KW, at this moment just need the charge power of adjustment array 10, make it be no more than 10KW, guaranteed that like this electrical network can be because of the battery energy storage power station charging is impacted other power supplies with electric unit.
Described supervisory control system 40 can also be come according to the load of electrical network the discharge power of regulating cell array 10, and to guarantee electrical network after the electric energy that receives described array 10, the power of electrical network is no more than the capacity of electrical network.Can avoid like this electrical network is impacted.
In addition, described supervisory control system 40 is the detection of grid state automatically, prevents the generation of island effect.Described supervisory control system 40 can also be carried out detecting fault and diagnosis automatically in the start-up and operation process of power station, and according to concrete failure mode and effects scope, takes automatically protection action.Described automatic fault is detected and is diagnosed as the technological means that this area is commonly used, and repeats no more in this.
Below with reference to Fig. 4 the method for balancing power network load provided by the invention is described.
The method of array 10 balancing power network loads of utilizing provided by the invention comprises: the load of detection of grid, frequency and phase place; And when described load during less than predetermined value, utilize the electric energy of electrical network that array 10 is charged; When described load during more than or equal to predetermined value, to be input to electrical network with the frequency of electrical network and the mode of phase place synchronised, described predetermined value is less than or equal to the capacity of electrical network with the electric energy of described array 10.
Wherein, described method also is included in and will be converted to low tension from the high-tension electricity of electrical network first before the electric energy that utilizes electrical network charges to array (10), to utilize this low tension to array 10 chargings; Before the electric energy of described array 10 is input to electrical network in the mode with the frequency of electrical network and phase place synchronised, the electric energy of described array 10 is converted to the high-tension electricity that has with the equivalent voltage of electrical network.
Wherein, described method can also comprise according to electricity price controls discharging and recharging of array 10, when electricity price is low, array 10 is charged; When institute's electricity price is high, the electric energy of array 10 is input to electrical network.
Wherein, described method can also comprise: the energy storage capacity that detects battery; Control discharging and recharging of array 10 according to the energy storage capacity that detects, so that array 10 is operated in the predetermined energy storage capacity scope.
Wherein, described method can also comprise: the temperature that detects array 10; Control discharging and recharging of array 10 according to the temperature that detects, so that array 10 is operated in the predetermined temperature range.
Wherein, described method can also comprise: come the charge power of regulating cell array 10 according to the load of electrical network, to guarantee can not make the electrical network overload operation.
Wherein, described method can also comprise: come the discharge power of regulating cell array 10 according to the load of electrical network, to guarantee electrical network after the electric energy that receives described array 10, the power of electrical network is no more than the capacity of electrical network.
The method of battery energy storage power station provided by the invention and balancing power network load is balancing power network load effectively, has solved well existing electrical network can't satisfy need for electricity in the peak of power consumption period problem.
Claims (9)
1. battery energy storage power station that is used for balancing power network load, this battery energy storage power station comprises:
Array (10);
Charging system (20), this charging system (20) are used for utilizing the electric energy of electrical network that described array (10) is charged;
Inversion system (30), this inversion system (30) are used for the electric energy of array (10) is input to electrical network; And
Supervisory control system (40), for detection of load, frequency and the phase place of electrical network, and when described load during less than predetermined value, control charging system (20) charges to array (10); When described load during more than or equal to predetermined value, control described inversion system (30) with the electric energy of array (10) to be input to electrical network with the frequency of electrical network and the mode of phase place synchronised, described predetermined value is less than or equal to the capacity of electrical network;
Wherein, described supervisory control system (40) also detects the energy storage capacity of array (10), controls charging system (20) and inversion system (30) according to the energy storage capacity that detects, so that array (10) is operated in the predetermined energy storage capacity scope;
Wherein, described supervisory control system (40) is also come charge power and the discharge power of regulating cell array (10) according to the load of electrical network, to guarantee can not to make the electrical network overload operation and to guarantee that the power of electrical network after the electric energy that receives described array (10) is no more than the capacity of electrical network.
2. power station according to claim 1, wherein, described power station also comprises charging transformer (50) and discharge transformer (60),
Described charging transformer (50) is used for and will be converted to low tension from the high-tension electricity of electrical network, and this low tension is offered charging system (20), so that charging system (20) utilizes this low tension that array (10) is charged;
Described discharge transformer (60) is used for being converted to from the low tension of inversion system (30) high-tension electricity that has with the equivalent voltage of electrical network, and this high-tension electricity is input to electrical network.
3. power station according to claim 2, wherein, described power station also comprises electric and relaying protection system (70), this electric and relaying protection system (70) is for the protection of described charging transformer (50) and discharge transformer (60).
4. power station according to claim 1 and 2, wherein, described supervisory control system (40) is also controlled discharging and recharging of array (10) according to electricity price, and when electricity price was low, control charging system (20) charged to array (10); When electricity price is high, controls described inversion system (30) electric energy of array (10) is input to electrical network.
5. power station according to claim 1 and 2, wherein, described supervisory control system (40) also detects the temperature of array (10), controls charging system (20) and inversion system (30) according to the temperature that detects, so that array (10) is operated in the predetermined temperature range.
6. method of utilizing the array balancing power network load, wherein, the method comprises:
The load of detection of grid, frequency and phase place; And
When described load during less than predetermined value, utilize the electric energy of electrical network that array (10) is charged; When described load during more than or equal to predetermined value, to be input to electrical network with the frequency of electrical network and the mode of phase place synchronised, described predetermined value is less than or equal to the capacity of electrical network with the electric energy of described array (10) in control;
Wherein, the method also comprises: the energy storage capacity that detects battery; Control discharging and recharging of array (10) according to the energy storage capacity that detects, so that array (10) is operated in the predetermined energy storage capacity scope;
Wherein, the method also comprises: come charge power and the discharge power of regulating cell array (10) according to the load of electrical network, can not make the electrical network overload operation and guarantee that the power of electrical network after the electric energy that receives described array (10) is no more than the capacity of electrical network guaranteeing.
7. method according to claim 6, wherein, the method also comprises: will be converted to low tension from the high-tension electricity of electrical network first before the electric energy that utilizes electrical network charges to array (10), to utilize this low tension array (10) be charged;
Before the electric energy of described array (10) is input to electrical network in the mode with the frequency of electrical network and phase place synchronised, the electric energy of described array (10) is converted to the high-tension electricity that has with the equivalent voltage of electrical network.
8. method according to claim 6, wherein, described method also comprises according to electricity price controls discharging and recharging of array (10), when electricity price is low, array (10) is charged; When institute's electricity price is high, the electric energy of array (10) is input to electrical network.
9. method according to claim 6, wherein, described method also comprises:
Detect the temperature of array (10);
Control discharging and recharging of array (10) according to the temperature that detects, so that array (10) is operated in the predetermined temperature range.
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| US20170047736A1 (en) * | 2014-04-24 | 2017-02-16 | Kyocera Corporation | Control method and control device |
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| CN104167751B (en) * | 2014-07-18 | 2016-05-18 | 上海电力学院 | Based on the microgrid economical operation method that charges and discharge storage integrated power station scheduling |
| CN105186547B (en) * | 2015-07-30 | 2017-11-17 | 中国海洋石油总公司 | A kind of battery energy storage system EMS and method |
| CN105656050A (en) * | 2016-03-21 | 2016-06-08 | 南京丰和自动化科技有限公司 | Intelligent energy storage and power distribution system |
| CN108879745B (en) * | 2018-09-12 | 2024-03-22 | 党祺云 | Comprehensive power generation system and method for improving unit peak regulation economy |
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