CN103107579A - Control method for battery energy storage system combining energy type and power type - Google Patents
Control method for battery energy storage system combining energy type and power type Download PDFInfo
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- CN103107579A CN103107579A CN2013100591774A CN201310059177A CN103107579A CN 103107579 A CN103107579 A CN 103107579A CN 2013100591774 A CN2013100591774 A CN 2013100591774A CN 201310059177 A CN201310059177 A CN 201310059177A CN 103107579 A CN103107579 A CN 103107579A
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Abstract
The invention relates to a control method for a battery energy storage system combining an energy type and a power type. Four key nodes are chosen so that a variation section of a state of charge (SOC) of the battery energy storage system is determined. SOC up to SOC max is an urgent charging section, SOC down to SOC up is an energy free transportation section and SOC down to SOC min is an urgent discharging section. When large power disturbance occurs in a located outer environment, the battery energy storage system always can preferably offer a rapid charging or discharging urgent power control function; and when the outer environment operates normally and the battery energy storage system is in the energy free transportation section, a charging state and a discharging state can be freely controlled according to outer environment requirements, when the battery energy storage system is in the urgent charging section, only discharge is allowed and when the battery energy storage system is in the urgent discharging section, only charge is allowed. According to the control method for the battery energy storage system, two functions of energy transportation and power urgent control can be integrated in one energy storage system, so that system device investment is reduced, device using rate is improved and economic benefit is good.
Description
Technical field
The present invention relates to adopt the power domain of battery energy storage system, particularly relate to a kind of control method of taking into account the battery energy storage system of energy type and power-type.
Background technology
Distributed power generation refers to that generally generated output in the thousands of watts of miniaturizations to 50 megawatts, modularization, distributed, the small power generation system that is connected to distribution system, is usually placed near the user, is customer power supply.Little electrical network refers to collect by distributed power source, energy storage device, energy converter, relevant load and monitoring, protective device the small-sized electric system of being transported to that forms.Be an autonomous system that can realize that the oneself controls, protects and manage, both can be incorporated into the power networks with large electrical network, also can isolated operation.Existing research and practice shows, little electrical network is the effective means of performance distributed power generation energy supplying system usefulness.
Energy-storage system is the important component part of micro-grid system, can smooth wind power, the power stage of the intermittent regenerative resource such as photovoltaic; The situation of exerting oneself of load and little power supply of can following is carried out the energy carrying, to significantly improve the utilance of regenerative resource; Can be in the large disturbance situation of micro-grid system, carry out urgent power and control, stable operation and the control of micro-grid system is played very important effect.
In recent years, the high capacity cell energy-storage system has obtained increasing application in power industry, in large capacity set Chinese style battery energy storage power station, usually energy-storage system is pressed the complete separate configurations of energy type and power-type, the former is in order to realize peak load shifting, and the latter is in order to realize the functions such as electrical network frequency modulation and power emergency control.In containing the micro-grid system of multiple distributed power source, also according to system requirements, energy-storage system is pressed energy type and power-type separate configurations, the former mainly carries out the energy carrying, improve the regenerative resource permeability, the latter mainly provides the rotation capacity of system standby, is used for the power emergency control in the large disturbance situation of micro-grid system.
But the battery energy storage system of configuration energy type and power-type, increased the equipment investment of electric power system, and the utilization rate of power type battery energy-storage system is lower simultaneously, does not possess good economic benefit.
In fact, energy-storage battery has possessed the ability than high rate charge-discharge, the lithium battery of especially being used widely in electric automobile at present; Simultaneously, for little electrical network, large electrical network and battery energy storage power station, system's large disturbance probability of occurrence less, and after large disturbance situation occurs, under the effect of power grid energy scheduling, the time that system needs urgent power to support is relatively short, so energy type and power-type can be integrated in same battery energy storage system fully.
This shows, above-mentioned existing separate configurations and the battery energy storage system of controlling respectively still have inconvenience and defective, and demand urgently further being improved.How to found the control method of the battery energy storage system of taking into account energy type and power-type that a kind of comprehensive utilization ratio is high, cost is low, have important research and economic worth.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of control method of taking into account the battery energy storage system of energy type and power-type, to guarantee the utilance of battery energy storage system, improves the electric power system economic benefit, thereby overcomes the deficiency that prior art exists.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of control method of taking into account the battery energy storage system of energy type and power-type: selected four key nodes define the constant interval of the state-of-charge SOC of battery energy storage system, and four key nodes are respectively SOC
min, SOC
Down, SOC
upWith SOC
max, SOC wherein
up-SOC
maxBe urgent charging prefecture, SOC
Down-SOC
upFor energy is freely carried district, SOC
Down-SOC
minBe urgent discharge prefecture; When being in energy, battery energy storage system freely carries district SOC
Down-SOC
upThe time, normally move as external environment, freely control charging and discharging state according to the external environment demand, when large power disturbance occurring as external environment, preferentially provide the urgent control function of power of quick charge or repid discharge; When battery energy storage system is in urgent charging prefecture SOC
up-SOC
maxThe time, only when appearring in external environment, large power surplus just allows by quick charge, and other constantly answer preferential discharge, make battery operation freely carry the district to energy; When battery energy storage system is in urgent discharge prefecture SOC
Down-SOC
minThe time, only when appearring in external environment, large power shortage just allows by repid discharge, and other should preferentially charge constantly, make battery be returned to as early as possible energy and freely carry the district.
Further, described external environment is little electrical network, large electrical network or battery energy storage power station.
After adopting such design, the present invention has the following advantages at least:
1, the present invention is according to different state-of-charge values, at the control node SOC of existing battery energy storage system
min, SOC
maxThe basis on, increased again two and controlled node SOC
Down, SOC
upBut battery energy storage system is divided into 3 Operational Zones, has realized the optimal control of battery energy storage system under the outside running environment of difference under different state-of-charges, energy carrying and power emergency control two functions can be integrated in a cover energy-storage system; Simple and flexible is easy to realize, compares with the hybrid type battery energy-storage system of independent allocating power type respectively and energy type, has reduced the battery energy storage system equipment investment, has improved utilization rate of equipment and installations, possesses economic benefit preferably.
2, the present invention is by the setting in urgent discharge prefecture and the prefecture of promptly charging, guaranteed that battery energy storage system all possesses the ability of power emergency control at any time on the one hand, also prevented from the other hand deeply filling the generation of deeply putting phenomenon, guaranteed the useful life of battery energy storage system.
Description of drawings
Above-mentioned is only the general introduction of technical solution of the present invention, and for can clearer understanding technological means of the present invention, the present invention is described in further detail below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the structural representation of the micro-grid system that contains multiple distributed power source that is suitable for of the present invention.
Fig. 2 is the state-of-charge interval division schematic diagram of battery energy storage system.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described:
A kind of control method of taking into account the battery energy storage system of energy type and power-type of the present invention, can be applicable to and contain a cover and take into account in little electrical network of the battery energy storage system of energy type and power-type, large electrical network or battery energy storage power station, be used for battery energy storage system is carried out control method, make it have energy carrying and power emergency control function concurrently.The below with micro-grid system for exemplify the example explanation.
as shown in Figure 1 for containing the micro-grid system of multiple distributed power source, this micro-grid system comprises diesel generator system 1, battery energy storage system 2, biomass power generation system 3, photovoltaic generating system 4, wind generator system 5, ac bus 6, load 7 and little electrical network central control unit 8, diesel generator system 1, battery energy storage system 2, biomass power generation system 3, photovoltaic generating system 4 is connected with wind generator system and is connected with ac bus 6 respectively, ac bus 6 connected loads 7, each electricity generation system 7 provides supply of electric power for loading, 8 pairs of micro-grid system energy of microgrid central control unit manage and Optimized Operation, wherein, → represent the sense of current,------represents control signal.
When guaranteeing that the load supply of electric power is reliable and stable, improve the permeability of regenerative resource as far as possible, reduce the consumption of fossil energy, reduce the economy of discharging and guaranteeing system, be a free-revving engine of little electricity power engineering practice.When micro-grid system normally moves, select diesel generating set to make main power source, set up voltage and the frequency of electrical network, provide rotary power standby for system simultaneously, stabilize the power momentary fluctuation of load and intermittent power supply (being photovoltaic generating system and wind generator system in the present embodiment), possess in short-term overload and underloading ability.The relative intermittent energy source of load power demand is exerted oneself when larger, and photovoltaic generating system and wind generator system operate in the maximal power tracing pattern, improve intermittent utilization of new energy resources rate; And intermittent new forms of energy relative load demand is when more than needed, and part more than needed is preferentially to the battery energy storage system charging, if still have more than neededly, need limit Power operation, even cut-out wind-powered electricity generation and photovoltaic generation unit.The power response characteristic of biomass power generation system is relatively slow, mainly bears the basic supply load of part, when intermittent new forms of energy are abundant; operate in low load factor level as far as possible, even shut down, and when intermittent new forms of energy are not enough; improve as much as possible and force level, to lower the consumption of diesel oil.
Specific to battery energy storage system, by controlling, on the one hand, can realize the energy carrying to intermittent new forms of energy such as wind-powered electricity generation and photovoltaics, make it follow workload demand as far as possible, improve the utilization of new energy resources rate; On the other hand, in the large disturbance situation of system, provide urgent power support, assist to keep system stability.
Shown in Figure 2, concrete control method is: selected four key nodes define the constant interval of the state-of-charge SOC of battery energy storage system, and four key nodes are respectively SOC
min, SOC
Down, SOC
upWith SOC
max, SOC wherein
minAnd SOC
maxBe mainly the injury that energy-storage battery is brought for fear of excessively discharging and recharging, determined SOC by self physical characteristic of energy-storage battery
up-SOC
maxBe urgent charging prefecture 21, SOC
Down-SOC
upFor energy is freely carried district 22, SOC
Down-SOC
minBe urgent discharge prefecture 23.
When being in energy, battery energy storage system freely carries district 22SOC
Down-SOC
upThe time, normally move as micro-grid system, freely control charging and discharging state according to little electrical network demand, realize the optimization carrying of energy, make the power stage of intermittent grid-connected power generation system follow the change of load as far as possible, improve the utilization of new energy resources rate; When large power disturbance appears in little electrical network, the urgent control function of power of quick charge or repid discharge preferentially is provided, assist to keep Systems balanth.
When battery energy storage system is in urgent charging prefecture 21SOC
up-SOC
maxThe time, only when appearring in micro-grid system, large power surplus just allows by quick charge, and other constantly answer preferential discharge, make battery operation freely carry district 22 to energy.As, when causing the instantaneous increase of system power surplus when the unexpected load rejection of micro-grid system, can cause the instantaneous underloading of diesel generating set, affect diesel generating set life-span and generating efficiency; At this moment, battery energy storage system is under the scheduling of microgrid central control unit, and quick charge absorbs surplus power, makes the diesel generating set Quick-return to the normal output level.The power surplus duration by the force level that goes out of reduction biomass power generation system, or is closed down the part diesel generating set when longer, even limits the power stage of intermittent grid-connected power generation system, realizes the equilibrium of supply and demand of system capacity in long time scale.
When battery energy storage system is in urgent discharge prefecture 23SOC
Down-SOC
minThe time, only when appearring in micro-grid system, large power shortage just allows by repid discharge, and other should preferentially charge constantly, make battery be returned to as early as possible energy and freely carry district 22.As, photovoltaic generating system and/or wind generator system power are exerted oneself and are suddenly reduced in micro-grid system, when perhaps load increases suddenly, battery energy storage system is under the scheduling of microgrid central control unit, repid discharge, make up power shortage, make the diesel generating set Quick-return to the normal power level, avoid causing the diesel generating set overload.The power shortage duration by the force level that goes out of raising biomass power generation system, or starts new diesel generating set when longer, realizes the equilibrium of supply and demand of system capacity in long time scale.
Battery energy storage system control method of the present invention has been taken into account the two kind functions of energy carrying with the power emergency control, has guaranteed that system all possesses the ability of power emergency control at any time, has also prevented from deeply filling the generation of deeply putting phenomenon on the other hand on the one hand.Wherein, urgent power is controlled the transient process that belongs in the large disturbance situation of system.Occur and after triggering battery energy storage system and entering urgent power and control operating mode in the large disturbance of system, should control and the dispatching management technology by system, eliminate gradually the consequence that disturbance produces, make as early as possible battery energy storage system be returned to the normal operating condition of energy carrying, avoid battery larger charge-discharge magnification operating condition for a long time.
The above; it is only preferred embodiment of the present invention; be not that the present invention is done any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (2)
1. a control method of taking into account the battery energy storage system of energy type and power-type, is characterized in that, selected four key nodes define the constant interval of the state-of-charge SOC of battery energy storage system, and four key nodes are respectively SOC
min, SOC
Down, SOC
upWith SOC
max, SOC wherein
up-SOC
maxBe urgent charging prefecture, SOC
Down-SOC
upFor energy is freely carried district, SOC
Down-SOC
minBe urgent discharge prefecture;
When being in energy, battery energy storage system freely carries district SOC
Down-SOC
upThe time, normally move as external environment, freely control charging and discharging state according to the external environment demand, when large power disturbance occurring as external environment, preferentially provide the urgent control function of power of quick charge or repid discharge;
When battery energy storage system is in urgent charging prefecture SOC
up-SOC
maxThe time, only when appearring in external environment, large power surplus just allows by quick charge, and other constantly answer preferential discharge, make battery operation freely carry the district to energy;
When battery energy storage system is in urgent discharge prefecture SOC
Down-SOC
minThe time, only when appearring in external environment, large power shortage just allows by repid discharge, and other should preferentially charge constantly, make battery be returned to as early as possible energy and freely carry the district.
2. the control method of taking into account the battery energy storage system of energy type and power-type according to claim 1, is characterized in that, described external environment is little electrical network, large electrical network or battery energy storage power station.
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| CN103580291A (en) * | 2013-11-27 | 2014-02-12 | 上海空间电源研究所 | Battery energy storage system integrating energy type and power type and control method thereof |
| CN107508304A (en) * | 2017-08-29 | 2017-12-22 | 国电联合动力技术有限公司 | A kind of partition control method of battery energy storage system |
| CN107547034A (en) * | 2017-01-20 | 2018-01-05 | 湖南大学 | A kind of island special power supply outfit and its control method |
| CN107769258A (en) * | 2017-11-29 | 2018-03-06 | 湖南红太阳新能源科技有限公司 | The electric power system and its control method of a kind of independent micro-grid |
| CN112467791A (en) * | 2020-11-19 | 2021-03-09 | 国网经济技术研究院有限公司 | Wind-solar-energy-storage combined operation method and system considering load characteristic requirements |
| CN113131498A (en) * | 2019-12-31 | 2021-07-16 | 南京南瑞继保电气有限公司 | Independent micro-grid control method |
| CN113199946A (en) * | 2020-12-11 | 2021-08-03 | 广东电网有限责任公司电力调度控制中心 | Electric automobile energy storage polymerization modeling method based on Markov process |
| CN115347588A (en) * | 2022-10-19 | 2022-11-15 | 成都理工大学 | Microgrid energy storage system |
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| CN103580291B (en) * | 2013-11-27 | 2015-09-30 | 上海空间电源研究所 | Take into account battery energy storage system and the control method thereof of energy type power-type |
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| CN107547034A (en) * | 2017-01-20 | 2018-01-05 | 湖南大学 | A kind of island special power supply outfit and its control method |
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| CN107508304B (en) * | 2017-08-29 | 2020-09-08 | 国电联合动力技术有限公司 | Partition control method of battery energy storage system |
| CN107769258A (en) * | 2017-11-29 | 2018-03-06 | 湖南红太阳新能源科技有限公司 | The electric power system and its control method of a kind of independent micro-grid |
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| CN113131498A (en) * | 2019-12-31 | 2021-07-16 | 南京南瑞继保电气有限公司 | Independent micro-grid control method |
| CN112467791A (en) * | 2020-11-19 | 2021-03-09 | 国网经济技术研究院有限公司 | Wind-solar-energy-storage combined operation method and system considering load characteristic requirements |
| CN113199946A (en) * | 2020-12-11 | 2021-08-03 | 广东电网有限责任公司电力调度控制中心 | Electric automobile energy storage polymerization modeling method based on Markov process |
| CN113199946B (en) * | 2020-12-11 | 2023-06-20 | 广东电网有限责任公司电力调度控制中心 | Electric automobile energy storage aggregation modeling method based on Markov process |
| CN115347588A (en) * | 2022-10-19 | 2022-11-15 | 成都理工大学 | Microgrid energy storage system |
| CN115347588B (en) * | 2022-10-19 | 2022-12-20 | 成都理工大学 | Microgrid energy storage system |
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Application publication date: 20130515 |