CN103050986A - Microgrid and stored energy dispatching method thereof - Google Patents
Microgrid and stored energy dispatching method thereof Download PDFInfo
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- CN103050986A CN103050986A CN2012105888335A CN201210588833A CN103050986A CN 103050986 A CN103050986 A CN 103050986A CN 2012105888335 A CN2012105888335 A CN 2012105888335A CN 201210588833 A CN201210588833 A CN 201210588833A CN 103050986 A CN103050986 A CN 103050986A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a microgrid and a stored energy dispatching method thereof. The microgrid mainly comprises a photovoltaic module, an inverter, a storage battery, a main network, a rotary load, a super capacitor, a variable frequency starting device and the like, wherein the photovoltaic module is connected onto an alternating current bus through the inverter; the super capacitor is connected onto the alternating current bus after being converted into alternating current through the inverter; and an energy storage battery is connected onto the alternating current bus through the inverter. According to the method, a stored energy operation mode is adjusted according to the state of the microgrid; when the rotary load is started, the super capacitor is adopted to discharge to balance photovoltaic power generation and loading; during the operation process of the rotary load, the super capacitor is preferentially adopted to output power, the discharge of the super capacitor is ended, and the energy storage battery outputs power. According to the microgrid and the stored energy dispatching method thereof disclosed by the invention, the problems that an impact effect is generated to the microgrid when the rotary load is started and the power supply reliability is low are solved; clean and renewable energy sources are fully utilized, and moreover, the waste of the clean and renewable energy sources is avoided; and the overall service life of the microgrid is prolonged while the power supply reliability of a user is guaranteed.
Description
Technical field
The present invention relates to little electric power network technique, relate in particular to a kind of little electrical network energy storage dispatching method that contains rotary load, take rational dispatching method to make the load clean boot, guarantee little power grid operation.
Background technology
Along with the fast development of little electric power network technique, more and more higher to the requirement of little mains supply reliability.Yet exist some intermittent little sources and living load that the stable operation of micro-grid system is had a negative impact in the microgrid.Because energy storage has faster characteristics of two-way flow and response speed, can effectively improve micro net power quality and improve the stability of a system, has become a requisite part in the microgrid.
Present existing little electrical network energy storage scheduling strategy, the little electrical network that contains common load is dispatched, that is: real-time judge line voltage and mains frequency according to frequency departure dynamic dispatching energy storage energy, can reduce the frequency fluctuation amplitude and overcome system frequency vibration aggravation; And according to generating electric weight and workload demand situation, the energy-storage battery state-of-charge judges that energy storage discharges and recharges operational mode.The lower energy-storage batteries of prices that adopt are as the balance of photovoltaic generation and load more in present little electrical network, and deep discharge seriously influenced life-span of battery.On the other hand, to containing little electrical network of rotary load, starting current is excessive when rotary load starts, and reactive requirement is large, and energy-storage battery configuration capacity demand is very large, and the economy of little electrical network has been produced certain impact.
Chinese patent 201020624601: a kind of battery energy storage monitoring scheduling system, the every terms of information that the electrical network prediction that the electrical network prediction that Dispatching Control System generates according to the network load prognoses system generates and battery energy storage supervisory control system send, judge charge and discharge mode, and order is sent to electrical network connecting system and battery management system, control energy-storage battery group is by electrical network connecting system access electrical network, and by after the transformer substation system transformation, discharge and recharge operation with electrical network.If this method is used for containing little electrical network of rotary load, require energy-storage battery that enough large capacity is arranged, affect its economy.
Summary of the invention
The invention provides a kind of little electrical network and energy storage dispatching method thereof with high power supply reliability, high quality of power supply.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of little electrical network, and its key technology is: it comprises photovoltaic module, inverter, energy-storage battery, little electrical network ac bus, rotary load, common load, ultracapacitor and static frequency converter; Described photovoltaic module is connected on little electrical network ac bus by inverter, described super capacitor converts alternating current to by inverter and is connected on little electrical network ac bus, described energy-storage battery is connected on little electrical network ac bus by inverter, described common load directly connects little electrical network ac bus, and described rotary load connects little electrical network ac bus by static frequency converter; Described energy-storage battery and ultracapacitor consist of energy-storage system.
Described rotary load is large-size asynchronous motor.
Electricity generation module in the described photovoltaic module has the maximal power tracing point module.
The present invention also provides the energy storage dispatching method of above-mentioned little electrical network, when rotary load starts, adopts ultracapacitor discharge balance; In the rotary load running, preferentially adopt ultracapacitor to exert oneself, the ultracapacitor discharge finishes, and energy-storage battery is exerted oneself;
Dispatching method step when little power grid operation is as follows:
1) system acquisition photovoltaic module generated output and workload demand according to major network voltage and major network frequency, are judged the storage energy operation mode again;
If major network voltage and major network frequency are normal, employing is incorporated into the power networks, and generated output, preferentially to the ultracapacitor charging, charges to energy-storage battery in the situation that the energy storage state-of-charge is discontented with greater than workload demand again; Under the energy storage full power state, unnecessary electric weight is sent into major network; Generated output is less than workload demand, and the energy storage state-of-charge satisfies the discharge requirement, and photovoltaic generating system and energy-storage system in the not enough situation of energy storage, are purchased electricity to major network simultaneously to the load power supply again; Described photovoltaic module consists of photovoltaic generating system with the inverter that is positioned at its rear class.
2) if major network voltage and major network frequency anomaly adopt from network operation, generated output is greater than workload demand, in the situation that the energy storage state-of-charge is discontented with, preferentially to the ultracapacitor charging, again energy-storage battery is charged, if electric weight also has residue, the restriction photovoltaic generating system is exerted oneself; Generated output is less than workload demand, and the energy storage state-of-charge satisfies the discharge requirement, and photovoltaic generating system and energy-storage system are simultaneously to the load power supply.
Described energy-storage battery minimum is 60% of state-of-charge.
The little electrical network of the present invention adopts mixed energy storage system, i.e. ultracapacitor and energy-storage battery.Mixed energy storage system is shared the blanketing frequency fluctuation on the one hand, will keep on the other hand the stable of little source and load.Adopt mixed energy storage system, utilize ultracapacitor and static frequency converter to suppress the rotary load startup frequency of little electrical network is impacted, and adjust storage energy operation according to little electric network state.
The beneficial effect that adopts technique scheme to produce is: it can effectively solve rotary load and starts the impact that the stabilization of power grids is produced to adopt the present invention, and Effective Raise energy-storage system useful life, efficiently utilizes clean energy resource.
Description of drawings
Fig. 1 is schematic diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, little electrical network mainly comprises photovoltaic module, inverter, energy-storage battery, little electrical network ac bus (being that 400V exchanges bus rod), rotary load, common load (such as various household electrical appliance), super capacitor and motor frequency conversion starting drive (being frequency conversion starter), rotary load is carried out soft start, and the frequency fluctuation when suppressing Start-up and operating performance by ultracapacitor; Photovoltaic module is connected on little electrical network ac bus by inverter, and make photovoltaic module output maintain maximum power point by the MPPT method, super capacitor converts alternating current to by inverter and is connected on little electrical network ac bus, and energy-storage battery is connected on little electrical network ac bus by inverter.During work, measure in real time major network voltage and major network frequency, determine that little electrical network is incorporated into the power networks from the network operation mode.
The inner frequency departure of investigating in real time of little electrical network preferentially utilizes the fluctuation of ultracapacitor blanketing frequency, and in conjunction with the motor frequency conversion device, makes the little power grid operation that contains rotary load.
In the situation that is incorporated into the power networks:
1) when photovoltaic generating system (also crying little source, lower same) generation deficiency, ultracapacitor has capacity, energy-storage battery SOC〉60%, jointly powered for load by photovoltaic generating system and energy-storage system, preferentially utilize energy-storage battery;
2) when the photovoltaic generating system generation deficiency, ultracapacitor is without capacity, and energy-storage battery SOC＜60% is jointly powered, is the energy storage charging for load by photovoltaic generating system and major network, avoid the degree of depth charge and discharge cycles of energy-storage battery, prolong the useful life of energy-storage battery;
3) when photovoltaic generating system generating abundance and greater than workload demand, all underfills of ultracapacitor and energy-storage battery are preferably the ultracapacitor charging, are the energy-storage battery charging again, and unnecessary electric weight is sent into major network.
In the net situation:
1) when the photovoltaic generating system generation deficiency, then jointly is the load power supply by photovoltaic generating system and energy-storage system.
2) when photovoltaic generating system generating abundance and greater than workload demand, be preferably the ultracapacitor charging, be the energy-storage battery charging again.
The little electrical network of the present invention is exerted oneself according to frequency departure judgement energy storage, and by the ultracapacitor preferential discharge, ultracapacitor discharges, and is powered by energy-storage battery again.When balance photovoltaic generating system and load, energy-storage battery is preferentially powered.To mixed energy storage system charging, ultracapacitor preferentially charges, and is full of rear energy-storage battery to be charged.Little electrical network that the present invention contains rotary load has DC over-voltage protection, overcurrent protection, short-circuit protection.The present invention takes full advantage of clean reproducible energy, and has avoided the waste of clean reproducible energy; In the power supply reliability that has ensured the user, increased the useful life of little electrical network integral body.
Claims (4)
1. little electrical network, it is characterized in that: it comprises photovoltaic module, inverter, energy-storage battery, little electrical network ac bus, rotary load, common load, ultracapacitor and static frequency converter; Described photovoltaic module is connected on little electrical network ac bus by inverter, described ultracapacitor converts alternating current to by inverter and is connected on little electrical network ac bus, described energy-storage battery is connected on little electrical network ac bus by inverter, described common load directly connects little electrical network ac bus, and described rotary load connects little electrical network ac bus by static frequency converter; Described energy-storage battery and ultracapacitor consist of energy-storage system.
2. little electrical network according to claim 1, it is characterized in that: described rotary load is large-size asynchronous motor.
3. the little electrical network energy storage dispatching method that contains rotary load according to claim 1, it is characterized in that: the electricity generation module in the described photovoltaic module has the maximal power tracing point module.
4. the energy storage dispatching method of little electrical network claimed in claim 1 is characterized in that: when rotary load starts, adopt ultracapacitor discharge balance; In the rotary load running, preferentially adopt ultracapacitor to exert oneself, the ultracapacitor discharge finishes, and energy-storage battery is exerted oneself;
Dispatching method step when little power grid operation is as follows:
1) system acquisition photovoltaic module generated output and workload demand according to major network voltage and major network frequency, are judged the storage energy operation mode again;
If major network voltage and major network frequency are normal, employing is incorporated into the power networks, and generated output, preferentially to the ultracapacitor charging, charges to energy-storage battery in the situation that the energy storage state-of-charge is discontented with greater than workload demand again; Under the energy storage full power state, unnecessary electric weight is sent into major network; Generated output is less than workload demand, and the energy storage state-of-charge satisfies the discharge requirement, and photovoltaic generating system and energy-storage system in the not enough situation of energy storage, are purchased electricity to major network simultaneously to the load power supply again; Described photovoltaic module consists of photovoltaic generating system with the inverter that is positioned at its rear class;
2) if major network voltage and major network frequency anomaly adopt from network operation, generated output is greater than workload demand, in the situation that the energy storage state-of-charge is discontented with, preferentially to the ultracapacitor charging, again energy-storage battery is charged, if electric weight also has residue, the restriction photovoltaic generating system is exerted oneself; Generated output is less than workload demand, and the energy storage state-of-charge satisfies the discharge requirement, and photovoltaic generating system and energy-storage system are simultaneously to the load power supply.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600730A (en) * | 2015-01-21 | 2015-05-06 | 中国南方电网有限责任公司调峰调频发电公司 | Offline wireless parallel operation method of a plurality of energy storing converters in large-capacity energy storing system |
| CN104779634A (en) * | 2015-04-18 | 2015-07-15 | 韩少茹 | Micro-grid energy storage scheduling method |
| CN104868534A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Photovoltaic energy storage inverter energy management method |
| CN105896546A (en) * | 2016-05-17 | 2016-08-24 | 中国电力科学研究院 | Control method capable of restraining impact load based on hybrid energy storage system |
| US9620960B2 (en) | 2014-01-13 | 2017-04-11 | Abb Schweiz Ag | Control of a stabilizing energy storage in a microgrid |
| WO2017132802A1 (en) * | 2016-02-01 | 2017-08-10 | 无锡美凯能源科技有限公司 | Inverter control device and method for energy interconnection and energy storage of ac bus |
| CN107658893A (en) * | 2017-10-27 | 2018-02-02 | 湖州师范学院 | A kind of lifting unit energy recovery utilizing system and control method |
| CN108448652A (en) * | 2018-04-06 | 2018-08-24 | 刘玉华 | A kind of new energy and power grid cooperated power supply method and its calibration equipment |
| CN109066750A (en) * | 2018-09-11 | 2018-12-21 | 重庆大学 | Photovoltaic based on Demand Side Response-battery micro-capacitance sensor mixed tensor schedule management method |
| CN111404199A (en) * | 2020-04-22 | 2020-07-10 | 江苏东源电器集团股份有限公司 | Micro-grid hybrid energy storage system based on flywheel energy storage and control method |
| CN113394800A (en) * | 2021-05-11 | 2021-09-14 | 华为技术有限公司 | Energy storage system, temperature control method and photovoltaic power generation system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9620960B2 (en) | 2014-01-13 | 2017-04-11 | Abb Schweiz Ag | Control of a stabilizing energy storage in a microgrid |
| CN104600730A (en) * | 2015-01-21 | 2015-05-06 | 中国南方电网有限责任公司调峰调频发电公司 | Offline wireless parallel operation method of a plurality of energy storing converters in large-capacity energy storing system |
| CN104779634A (en) * | 2015-04-18 | 2015-07-15 | 韩少茹 | Micro-grid energy storage scheduling method |
| CN104868534A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Photovoltaic energy storage inverter energy management method |
| CN104868534B (en) * | 2015-05-12 | 2017-03-01 | 江苏固德威电源科技股份有限公司 | Photovoltaic energy storage inverter energy management method |
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| CN105896546A (en) * | 2016-05-17 | 2016-08-24 | 中国电力科学研究院 | Control method capable of restraining impact load based on hybrid energy storage system |
| CN107658893A (en) * | 2017-10-27 | 2018-02-02 | 湖州师范学院 | A kind of lifting unit energy recovery utilizing system and control method |
| CN108448652A (en) * | 2018-04-06 | 2018-08-24 | 刘玉华 | A kind of new energy and power grid cooperated power supply method and its calibration equipment |
| CN109066750A (en) * | 2018-09-11 | 2018-12-21 | 重庆大学 | Photovoltaic based on Demand Side Response-battery micro-capacitance sensor mixed tensor schedule management method |
| CN111404199A (en) * | 2020-04-22 | 2020-07-10 | 江苏东源电器集团股份有限公司 | Micro-grid hybrid energy storage system based on flywheel energy storage and control method |
| CN113394800A (en) * | 2021-05-11 | 2021-09-14 | 华为技术有限公司 | Energy storage system, temperature control method and photovoltaic power generation system |
| WO2022237831A1 (en) * | 2021-05-11 | 2022-11-17 | 华为数字能源技术有限公司 | Energy storage system, temperature control method, and photovoltaic power generation system |
| CN113394800B (en) * | 2021-05-11 | 2023-12-08 | 华为数字能源技术有限公司 | Energy storage system, temperature control method and photovoltaic power generation system |
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Inventor after: Gao Zhiqiang Inventor after: Fan Hui Inventor after: Tang Baofeng Inventor after: Xu Wentao Inventor after: Qiang Dongsheng Inventor after: Meng Liang Inventor after: Liang Bin Inventor after: Pan Xiao Inventor before: Gao Zhiqiang Inventor before: Tang Baofeng Inventor before: Xu Wentao Inventor before: Meng Liang Inventor before: Fan Hui Inventor before: Liang Bin Inventor before: Pan Xiao |
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