CN203278255U - Peak-clipping valley-filling compensation device of energy storage systems and energy storage system - Google Patents
Peak-clipping valley-filling compensation device of energy storage systems and energy storage system Download PDFInfo
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- CN203278255U CN203278255U CN 201320229634 CN201320229634U CN203278255U CN 203278255 U CN203278255 U CN 203278255U CN 201320229634 CN201320229634 CN 201320229634 CN 201320229634 U CN201320229634 U CN 201320229634U CN 203278255 U CN203278255 U CN 203278255U
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Abstract
The utility model provides a peak-clipping valley-filling compensation device of energy storage systems. The energy storage system comprises energy storage converters, super capacitor arrays, and transformers. The peak-clipping valley-filling compensation device comprises a power distribution control module; the alternative current side of each energy storage converter is connected with a power grid bus by the transformer, and the direct current side of each energy storage converter is connected with one super capacitor array; the number of the energy storage converters is equal to the number of the super capacitor arrays; the power distribution control module is used for detecting load power and sending a control command to the energy storage converters according to the load power, and the control command carries working modes of the energy storage converters and corresponding power values; the working modes comprise a discharge mode, a charge mode and a standby mode. At the same time, the plurality of redundant energy storage converters are more flexibly controlled. The energy storage converters are corresponded to one power distribution control module, thus the power is uniformly distributed and the reliability is improved. The utility model also discloses an energy storage system.
Description
Technical field
The utility model relates to quality of power supply regulation technology field, particularly a kind of peak load shifting compensation arrangement and energy-storage system of energy-storage system.
Background technology
Peak load shifting (Peak Load Shaving) refers to the scheduling by Generation Side or electricity consumption side, the sub-load of peakload in the period is arranged into low ebb in the load period, so that cut down system peakload, increase the low ebb load of system, improve load factor.
At present regulate in the quality of power supply peak load shifting compensation arrangement that has adopted in the field, not quite alike although present various compensation arrangements have in specific implementation process, comprise their checkout gear, compensation logic and control core chip etc.But all exist a common shortcoming with not enough, that is: all can not control simultaneously many current transformers and carry out the peak load shifting compensation.
The system that will cause like this being compensated can not be too large, and it is enough large that the current transformer during perhaps peak load shifting compensates and the capacity of energy-storage units need to arrange.If can not be too large by the system that compensated, except a small amount of with the little microgrid in tentative part, in practical engineering application major part need to carry out the power system capacity of peak load shifting compensation generally can be too not little.So the restriction of bucking-out system capacity can limit the application of whole compensation arrangement to a great extent.If the capacity of current transformer and energy-storage units is done very greatly, can cause on the one hand the increase of cost, on the other hand again with reality in be subject to the prior art such as power model and technique restriction contradicting too greatly of causing that the capacity of separate unit current transformer can not do.So in practical engineering application iff being to realize that controller controls a current transformer and carry out energy compensating, the formation of the whole system underaction that will become.Simultaneously also can have influence on compensation effect.
Therefore, how providing a kind of and can control simultaneously the device that many current transformers carry out the peak load shifting compensation, is those skilled in the art's technical issues that need to address.
The utility model content
The technical problems to be solved in the utility model is a kind of peak load shifting compensation arrangement and energy-storage system of energy-storage system, can control simultaneously many current transformers and carry out the peak load shifting compensation.
The utility model provides a kind of peak load shifting compensation arrangement of energy-storage system, and described energy-storage system comprises energy accumulation current converter, super capacitor array, transformer, and described peak load shifting compensation arrangement comprises the power division control module;
The AC of each energy accumulation current converter connects the electrical network bus by transformer, and the DC side of each energy accumulation current converter connects a super capacitor array; The number of described energy accumulation current converter equates with the number of described super capacitor array;
Described power division control module for detection of bearing power, and sends control command according to described bearing power to described energy accumulation current converter, and described control command is carried mode of operation and the corresponding performance number of energy accumulation current converter; Described mode of operation comprises discharge mode, charge mode and standby mode.
Preferably, also comprise busbar current transformer, bus-bar potential transformer and energy accumulation current converter ac-side current instrument transformer;
Described busbar current transformer is used for measuring bus current I2;
Described bus-bar potential transformer is used for measuring busbar voltage U;
Described energy accumulation current converter ac-side current instrument transformer is for the electric current I 1 of measuring the energy accumulation current converter AC;
Described bearing power is the poor of bus active power and energy accumulation current converter AC active power;
Described bus active power is obtained by described I2 and U;
Described energy accumulation current converter AC active power is obtained by described I1 and U;
Described I1 and I2 are the three-phase alternating current signal; Described U is three-phase alternating current line voltage signal.
Preferably, also comprise the CAN bus;
Described power division control device sends to described energy accumulation current converter by described CAN bus with the mode of operation of described energy accumulation current converter and corresponding performance number.
Preferably, described energy accumulation current converter is two way convertor;
When described mode of operation was charge mode, described energy accumulation current converter charged to described super capacitor array after the alternating current of electrical network is carried out rectification;
When described mode of operation was discharge mode, described energy accumulation current converter was that alternating current is load supplying with the dc inverter of described super capacitor array.
Preferably, described energy accumulation current converter sends to described power division control module by described CAN bus with the magnitude of voltage of described super capacitor array.
Preferably, also comprise host computer and 485 buses;
Described energy accumulation current converter sends to described host computer by described 485 buses with three-phase alternating current flow valuve, three-phase alternating voltage value, dc voltage value, DC current values and mode of operation.
Preferably, described power division control module is passed through the CAN bus and is connected the host computer connection, and described power division control module is used for by the CAN bus, described bus active power and energy accumulation current converter AC active power being sent to described host computer.
The utility model also provides a kind of energy-storage system, comprises energy accumulation current converter, super capacitor array, transformer and described peak load shifting compensation arrangement.
Compared with prior art, the utlity model has following advantage:
The peak load shifting compensation arrangement that the present embodiment provides can be controlled the energy accumulation current converter of many redundancies simultaneously, the power that distributes the energy accumulation current converter needs to provide according to bearing power.Control than separate unit energy accumulation current converter in prior art is more flexible.And many corresponding same power division control modules of energy accumulation current converter can be carried out the distribution of power so uniformly, and the structure during with respect to the corresponding control module of an energy accumulation current converter is more simple.And, when this compensation arrangement breaks down at some energy accumulation current converter, can proceed power back-off by other energy accumulation current converters, improved reliability.
Description of drawings
Fig. 1 is peak load shifting compensation arrangement embodiment one schematic diagram that the utility model provides;
Fig. 2 is peak load shifting compensation arrangement embodiment two schematic diagrames that the utility model provides;
Fig. 3 is peak load shifting compensation arrangement embodiment three schematic diagrames that the utility model provides.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
Referring to Fig. 1, this figure is peak load shifting compensation arrangement embodiment one schematic diagram that the utility model provides.
The peak load shifting compensation arrangement that the present embodiment provides comprises: energy accumulation current converter 1, super capacitor array 2, power division control module 3;
The AC of each energy accumulation current converter 1 connects the second electrical network bus by the second transformer 4, and the DC side of each energy accumulation current converter 1 connects a super capacitor array 2; The number of described energy accumulation current converter 1 equates with the number of described super capacitor array 2;
The second electrical network bus connects the first electrical network bus by the first transformer 7;
The electric pressure of the first transformer 7 and the second transformer 4 can be different electric pressures.
Need to prove, the first transformer 4 that each energy accumulation current converter 1 AC connects can be identical transformer, also can be different transformers.
As shown in fig. 1, when super capacitor array 2 had N, energy accumulation current converter 1 also had N.
Be understandable that, energy accumulation current converter 1 is two way convertor, can be both alternating current with the dc inverter of super capacitor array 2 storages, can be also that direct current is that super capacitor array 2 charges with the AC rectification of electrical network.
Described power division control module 3 for detection of bearing power, and sends control command according to described bearing power to described energy accumulation current converter, and described control command is carried mode of operation and the corresponding performance number of energy accumulation current converter 1; Described mode of operation comprises discharge mode, charge mode and standby mode.
The peak load shifting compensation arrangement that the present embodiment provides can be controlled the energy accumulation current converter of many redundancies simultaneously, the power that distributes the energy accumulation current converter needs to provide according to bearing power.Control than separate unit energy accumulation current converter in prior art is more flexible.And many corresponding same power division control modules of energy accumulation current converter can be carried out the distribution of power so uniformly, and the structure during with respect to the corresponding control module of an energy accumulation current converter is more simple.And, when this compensation arrangement breaks down at some energy accumulation current converter, can proceed power back-off by other energy accumulation current converters, improved reliability.
Referring to Fig. 2, this figure is peak load shifting compensation arrangement embodiment two schematic diagrames that the utility model provides.
Introduce in detail the specific works principle of the compensation arrangement that the utility model provides below in conjunction with Fig. 2.
The peak load shifting compensation arrangement that the present embodiment provides also comprises busbar current transformer CT1, bus-bar potential transformer PT and energy accumulation current converter ac-side current instrument transformer CT2;
Described busbar current transformer CT1 is used for measuring bus current I2;
Described bus-bar potential transformer PT is used for measuring busbar voltage U;
Described energy accumulation current converter ac-side current instrument transformer CT2 is for the electric current I 1 of measuring the energy accumulation current converter AC;
Described bearing power is the poor of bus active power and energy accumulation current converter AC active power;
Described bus active power is obtained by described I2 and U;
Described energy accumulation current converter AC active power is obtained by described I1 and U.
Described I1 and I2 all refer to the three-phase alternating current signal, and U refers to three-phase alternating current line voltage signal.
Also comprise the CAN bus in the present embodiment;
Described power division control device 3 sends to described energy accumulation current converter 1 by described CAN bus with the mode of operation of described energy accumulation current converter and corresponding performance number.
The below introduces, and when loading demand power was larger, energy accumulation current converter worked in the specific works principle of inverter mode.
Described energy accumulation current converter is two way convertor;
When described mode of operation was charge mode, described energy accumulation current converter charged to described super capacitor array after the alternating current of electrical network is carried out rectification;
When described mode of operation was discharge mode, described energy accumulation current converter was that alternating current is load supplying with the dc inverter of described super capacitor array stores.
At first, described power division control device 3 can draw bus active-power P 1 and energy accumulation current converter outlet side active-power P 2 according to described U, I1 and I2; Can obtain bearing power P3 by P1 and P2 negative.
P3 and predetermined power higher limit are compared, and when P3 surpasses the predetermined power higher limit, the expression load will cause like this electrical network trough to occur and fall phenomenon, to the mass formation adverse effect of electrical network from the larger energy of the instantaneous absorption of electrical network.Therefore, in order to alleviate or to eliminate this adverse effect, this compensation arrangement is controlled energy accumulation current converter and is worked in inverter mode, will feed back to electrical network after the electric energy inversion on the super capacitor array, compensates like this power that a part of load needs, thereby alleviates the burden of electrical network.
Particularly, described power division control device 3 sends discharge mode control command and corresponding discharge power value by the CAN bus to every energy accumulation current converter 1.Thereby make energy accumulation current converter 1 replenish the energy that load instantaneous absorbs, reduce load to the impact of electrical network, slow electrical network trough disturbance.
Need to prove, the discharge power value of every energy accumulation current converter 1 can be distributed according to the method for average, and namely the mean value of the difference of P3 and predetermined power higher limit needs the power of output as every energy accumulation current converter 1.
During less than the predetermined power lower limit, the expression load discharges large energy to electrical network, causes electrical network the crest phenomenon to occur as P3.At this moment, for the impact of level and smooth load to electrical network, energy accumulation current converter works in rectification state, and the alternating current of net side is carried out after rectification to the charging of super capacitor array.
Particularly, described power division control device 3 sends charge mode control command and corresponding charge power value by the CAN bus to every energy accumulation current converter 1.Thereby make the energy of energy accumulation current converter 1 absorbing load instantaneous relase, alleviate load to the impact of electrical network, play the effect of level and smooth electrical network.
Similar when working in inverter mode with energy accumulation current converter, adopt the method for average to distribute power, namely the mean value of the difference of P3 and predetermined power lower limit need to send to the power of super capacitor array as every energy accumulation current converter 1.
Be understandable that, if P3 greater than described predetermined power lower limit and less than described predetermined power higher limit, power division control device 3 sends the Opportunity awaiting control for linear order to every energy accumulation current converter 1.
In addition, in the present embodiment, maintain fuller electric power storage state in order to guarantee the super capacitor array, guarantee that the back discharges and recharges compensation effect.
The magnitude of voltage that power division control module 3 can detect each super capacitor array is during lower than the first magnitude of voltage the minimum set point of energy accumulation current converter direct voltage of 1.1 times (for example lower than), if what 3 pairs of these energy accumulation current converters of power division control module this moment will issue is discharge mode control command or standby mode control command, these two kinds of control commands all can be converted into the charge mode control command and be handed down to energy accumulation current converter 1 again so.If what power division control module 3 will issue is the charge mode control command, the charge mode control command can normally send to energy accumulation current converter 1 so.
The magnitude of voltage that power division control module 3 detects certain super capacitor array 2 higher than the second voltage value (for example, 0.9 in the time of the highest set point of energy accumulation current converter direct voltage doubly), if what 3 pairs of these energy accumulation current converters 1 of power division control module this moment will send is charge mode control command or standby mode control command, charge mode control command or standby mode control command can be converted into the discharge mode control command and send to energy accumulation current converter 1 again so; If what power division control module 3 will issue is the discharge mode control command, the discharge mode control command still can normally be handed down to energy accumulation current converter 1 so.
The magnitude of voltage that power division control module 3 detects certain super capacitor array 2 (for example is positioned at the first voltage range, greater than the minimum set point of direct voltage of the energy accumulation current converters of 1.1 times and less than the highest set point of direct voltage of the energy accumulation current converter of 0.9 times) time, the initial charge/discharge pattern control command that power division control module 3 will send or initial Opportunity awaiting control for linear order all can normally send to energy accumulation current converter 1.
In above embodiment, power division control module 3 is as main frame, and every energy accumulation current converter 1 is as slave.
Need to prove, the utility model also provides a kind of embodiment, also comprises host computer in the present embodiment, and referring to Fig. 3, this figure is peak load shifting compensation arrangement embodiment three schematic diagrames that the utility model provides.
In the present embodiment, also comprise host computer 5 and 485 buses;
Described energy accumulation current converter 1 sends to described host computer 5 by described 485 buses with three-phase alternating current flow valuve, three-phase alternating voltage value, dc voltage value, DC current values and mode of operation.These values are that 485 communications by each energy accumulation current converter are to host computer.485 mailing addresses of each energy storage inverter are different, so host computer can be inquired about by different mailing addresses is set the electric parameter of each energy accumulation current converter.
Direct voltage and direct current are all to obtain after energy accumulation current converter is sampled by its inner sample circuit, pass through at last 485 communications to host computer.
Described power division control module 3 is passed through the CAN bus and is connected host computer 5 connections, and described power division control module 3 is used for by the CAN bus, described bus active power and energy accumulation current converter AC active power being sent to described host computer 5.
In the present embodiment, also comprise the sample circuit (not shown) that is connected with the super capacitor array with described energy accumulation current converter;
Described sample circuit gathers the magnitude of voltage of described super capacitor array, and described magnitude of voltage is sent to energy accumulation current converter;
Described energy accumulation current converter sends to described power division control module with described magnitude of voltage by described CAN bus.
By host computer 5 can remote monitoring peak load shifting compensation arrangement provided by the invention operating state.
The peak load shifting compensation arrangement of the energy-storage system that the utility model provides based on above embodiment also provides a kind of energy-storage system.
The energy-storage system that the present embodiment provides comprises the described peak load shifting compensation arrangement of energy accumulation current converter, super capacitor array, transformer and above embodiment.The above is only preferred embodiment of the present utility model, is not the utility model is done any pro forma restriction.Although the utility model discloses as above with preferred embodiment, yet is not to limit the utility model.Any those of ordinary skill in the art, do not breaking away from technical solutions of the utility model scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solutions of the utility model, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solutions of the utility model, all still belongs in the scope of technical solutions of the utility model protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present utility model.
Claims (8)
1. the peak load shifting compensation arrangement of an energy-storage system, is characterized in that, described energy-storage system comprises energy accumulation current converter, super capacitor array, transformer, and described peak load shifting compensation arrangement comprises the power division control module;
The AC of each energy accumulation current converter connects the electrical network bus by transformer, and the DC side of each energy accumulation current converter connects a super capacitor array; The number of described energy accumulation current converter equates with the number of described super capacitor array;
Described power division control module for detection of bearing power, and sends control command according to described bearing power to described energy accumulation current converter, and described control command is carried mode of operation and the corresponding performance number of energy accumulation current converter; Described mode of operation comprises discharge mode, charge mode and standby mode.
2. peak load shifting compensation arrangement according to claim 1, is characterized in that, also comprises busbar current transformer, bus-bar potential transformer and energy accumulation current converter ac-side current instrument transformer;
Described busbar current transformer is used for measuring bus current I2;
Described bus-bar potential transformer is used for measuring busbar voltage U;
Described energy accumulation current converter ac-side current instrument transformer is for the electric current I 1 of measuring the energy accumulation current converter AC;
Described bearing power is the poor of bus active power and energy accumulation current converter AC active power;
Described bus active power is obtained by described I2 and U;
Described energy accumulation current converter AC active power is obtained by described I1 and U;
Described I1 and I2 are the three-phase alternating current signal; Described U is three-phase alternating current line voltage signal.
3. peak load shifting compensation arrangement according to claim 1, is characterized in that, also comprises the CAN bus;
Described power division control device sends to described energy accumulation current converter by described CAN bus with the mode of operation of described energy accumulation current converter and corresponding performance number.
4. peak load shifting compensation arrangement according to claim 3, is characterized in that, described energy accumulation current converter is two way convertor;
When described mode of operation was charge mode, described energy accumulation current converter charged to described super capacitor array after the alternating current of electrical network is carried out rectification;
When described mode of operation was discharge mode, described energy accumulation current converter was that alternating current is load supplying with the dc inverter of described super capacitor array.
5. peak load shifting compensation arrangement according to claim 3, is characterized in that, described energy accumulation current converter sends to described power division control module by described CAN bus with the magnitude of voltage of described super capacitor array.
6. peak load shifting compensation arrangement according to claim 5, is characterized in that, also comprises host computer and 485 buses;
Described energy accumulation current converter sends to described host computer by described 485 buses with three-phase alternating current flow valuve, three-phase alternating voltage value, dc voltage value, DC current values and mode of operation.
7. peak load shifting compensation arrangement according to claim 5, it is characterized in that, described power division control module is passed through the CAN bus and is connected the host computer connection, and described power division control module is used for by the CAN bus, described bus active power and energy accumulation current converter AC active power being sent to described host computer.
8. an energy-storage system, comprise the described peak load shifting compensation arrangement of energy accumulation current converter, super capacitor array, transformer and claim 1 to 7 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320229634 CN203278255U (en) | 2013-04-28 | 2013-04-28 | Peak-clipping valley-filling compensation device of energy storage systems and energy storage system |
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| CN 201320229634 CN203278255U (en) | 2013-04-28 | 2013-04-28 | Peak-clipping valley-filling compensation device of energy storage systems and energy storage system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467509A (en) * | 2014-12-18 | 2015-03-25 | 江苏方程电力科技有限公司 | Two-way energy storage converter |
| CN104753076A (en) * | 2013-12-31 | 2015-07-01 | 比亚迪股份有限公司 | Battery energy storage system for peak load shifting and control method thereof |
| CN106786755A (en) * | 2016-12-30 | 2017-05-31 | 国网山西省电力公司太原供电公司 | A kind of energy-storage system and control method |
| CN108832647A (en) * | 2018-06-21 | 2018-11-16 | 江苏英耐杰新能源有限公司 | A kind of battery energy storage system for power distribution network peak load shifting |
| DE102017211355A1 (en) * | 2017-07-04 | 2019-01-10 | Siemens Aktiengesellschaft | Arrangement for balancing voltage drops and system with such an arrangement |
| CN111293711A (en) * | 2018-12-10 | 2020-06-16 | 上海电气分布式能源科技有限公司 | Energy management method of energy storage system |
-
2013
- 2013-04-28 CN CN 201320229634 patent/CN203278255U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753076A (en) * | 2013-12-31 | 2015-07-01 | 比亚迪股份有限公司 | Battery energy storage system for peak load shifting and control method thereof |
| CN104467509A (en) * | 2014-12-18 | 2015-03-25 | 江苏方程电力科技有限公司 | Two-way energy storage converter |
| CN104467509B (en) * | 2014-12-18 | 2016-11-16 | 江苏方程电力科技有限公司 | A kind of bidirectional energy-storage current transformer |
| CN106786755A (en) * | 2016-12-30 | 2017-05-31 | 国网山西省电力公司太原供电公司 | A kind of energy-storage system and control method |
| DE102017211355A1 (en) * | 2017-07-04 | 2019-01-10 | Siemens Aktiengesellschaft | Arrangement for balancing voltage drops and system with such an arrangement |
| US11881712B2 (en) | 2017-07-04 | 2024-01-23 | Fluence Energy, Llc | Voltage dip compensation system and arrangement in a power supply network |
| CN108832647A (en) * | 2018-06-21 | 2018-11-16 | 江苏英耐杰新能源有限公司 | A kind of battery energy storage system for power distribution network peak load shifting |
| CN111293711A (en) * | 2018-12-10 | 2020-06-16 | 上海电气分布式能源科技有限公司 | Energy management method of energy storage system |
| CN111293711B (en) * | 2018-12-10 | 2023-11-10 | 上海电气分布式能源科技有限公司 | Energy management method for energy storage system |
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Granted publication date: 20131106 |