CN108418201A - A kind of direct-current grid energy storage device master & slave control system - Google Patents

A kind of direct-current grid energy storage device master & slave control system Download PDF

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Publication number
CN108418201A
CN108418201A CN201810276292.XA CN201810276292A CN108418201A CN 108418201 A CN108418201 A CN 108418201A CN 201810276292 A CN201810276292 A CN 201810276292A CN 108418201 A CN108418201 A CN 108418201A
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China
Prior art keywords
energy storage
storage device
soc
module
busbar voltage
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Pending
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CN201810276292.XA
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Chinese (zh)
Inventor
王海英
关慧媛
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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Priority to CN201810276292.XA priority Critical patent/CN108418201A/en
Publication of CN108418201A publication Critical patent/CN108418201A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00Circuit arrangements for dc mains or dc distribution networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a kind of direct-current grid energy storage device master & slave control systems, including distributed generation resource, two-way DC/DC converters, energy storage device and controller system, the present invention carries out backstepping sliding formwork control to two-way DC/DC converters, it is made to carry out model selection automatically according to collected busbar voltage:It when busbar voltage is excessively high, controls it and enters Buck charge modes, electric current flows to energy storage device side to charge the battery from bus bar side, accumulator SOC is monitored at this time, when SOC reaches SOCmaxWhen, stop charging immediately;It when busbar voltage is too low, controls it and enters Boost discharge modes, for electric current from energy storage device effluent to bus bar side, battery discharging monitors SOC, when SOC is less than SOCminWhen, stop electric discharge.The stabilization of busbar voltage and the balance of microgrid power are kept with this.

Description

A kind of direct-current grid energy storage device master & slave control system
Technical field
The present invention relates to a kind of energy storage technology, specifically a kind of direct-current grid energy storage device master & slave control system.
Background technology
With economic continuous development, demand of the domestic all trades and professions to electric power is also constantly increasing, nation-building power generation The paces of factory and transmission line of electricity are increasingly accelerated.The public reflected advantage of bulk power grid makes it quickly send out in over the past several decades Exhibition, becomes the principal mode of supply of electric power.However as the continuous expansion of power grid scale, some drawbacks of large-scale power grid system It is increasingly prominent:(1)In the large-scale power grid system of conventional electric power industry, once a certain nodes break down, it is possible to cause Large-scale power supply trouble;(2)Bulk power system can not timely respond to the acute variation of load, peak of power consumption occur when summer, When power load is increased sharply suddenly, the problem of being susceptible to electricity shortage;(3)For remote mountain areas, grid power system Construction is difficult Degree is big, of high cost, inefficiencies of powering.In addition, world energy sources are mainly derived from non-renewable natural resources, it is tellurian Resource becomes more and more in short supply, it is difficult to maintain the long-run development of human society.Especially occur in succession in recent years in world wide Several times after large area blackout, the fragility of large-scale power grid system is fully exposed, suddenly caused by power-off not only It is economic loss, goes back the safety and stabilization of entail dangers to society.Therefore, it is entered using the micro-capacitance sensor that regenerative resource generates electricity The visual field of people.
Micro-capacitance sensor is the autonomous system of the dispersion of scale is smaller, and distributed generation resource, energy storage device, load are related to one by it It rises, is directly connected on user side, can be regarded as a controllable in bulk power grid.Micro-capacitance sensor may be connected to bulk power grid, realize Be incorporated into the power networks, can also be detached from bulk power grid, realize islet operation, but all must satisfy power quality requirement, ensure power supply safety and System is stablized.Since the stability of distributed generation resource is poor, configuring energy storage device for micro-capacitance sensor has boundless hair Open up space.
Energy storage device carries out charging energy-storing when micro-grid connection is run, and electric energy can be discharged in isolated power grid, is micro- Power grid provides stable voltage support, is that micro-capacitance sensor is stable, ensures the important leverage of system uninterrupted power supply.Micro-capacitance sensor The quantity of battery is more in energy storage device, capacity is big, charging and discharging currents are big, real-time to information collection and it is battery balanced require compared with Height, therefore, design battery management system, monitor battery status in real time, be energy storage device can discharge adjustment busbar voltage, maintain The basis of power-balance in entire micro-capacitance sensor.
Since there are voltage differences between energy storage device and busbar, and energy storage device has two kinds of charging, electric discharge operating modes, So it is electric energy two-way flow between energy storage device and busbar that power electronics interface is added between energy storage device and busbar Prerequisite.
To sum up, energy storage device, design battery management system are configured in micro-capacitance sensor, between energy storage device and busbar Power electronics interface is controlled, and battery status can be effectively monitored, and so that energy storage device is charged when busbar voltage is higher, is female It discharges when line voltage is relatively low, micro-capacitance sensor electric energy is made full use of, busbar voltage fluctuation is quickly inhibited, ensures that micro-capacitance sensor stablizes fortune Row has important practical significance.
Invention content
The purpose of the present invention is to provide a kind of direct-current grid energy storage device master & slave control systems, to solve above-mentioned background The problem of being proposed in technology.
To achieve the above object, the present invention provides the following technical solutions:
A kind of direct-current grid energy storage device master & slave control system, including distributed generation resource, two-way DC/DC converters, energy storage dress It sets and controller system, distributed generation resource is separately connected load, two-way DC/DC converters and control system by DC bus, Two-way DC/DC converters are also connected with energy storage device, and energy storage device is also connected with control system, and control system is also connected with two-way DC/DC Converter.
Further technical solution as the present invention:The energy storage device includes main control module, power module, anti-interference mould Block, SOC estimation blocks, acquisition module, LCD display module, communication module and PC machine, main control module be separately connected power module, Immunity module, SOC estimation blocks, acquisition module, LCD display module and communication module, communication module are also connected with PC machine.
Compared with prior art, the beneficial effects of the invention are as follows:The present invention carries out backstepping sliding formwork to two-way DC/DC converters Control, makes it carry out model selection automatically according to collected busbar voltage:When busbar voltage is excessively high, controls it and enter Buck Charge mode, electric current flow to energy storage device side to charge the battery from bus bar side, accumulator SOC are monitored at this time, when SOC reaches SOCmaxWhen, stop charging immediately;When busbar voltage is too low, controls it and enter Boost discharge modes, electric current is from energy storage device Effluent monitors SOC to bus bar side, battery discharging, when SOC is less than SOCminWhen, stop electric discharge.Busbar voltage is kept with this Stable and microgrid power balance.
Description of the drawings
Fig. 1 is energy storage device battery management system figure.
Fig. 2 is energy storage device battery management system overall structure figure.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig.1-2, a kind of direct-current grid energy storage device master & slave control system, including distributed generation resource, two-way DC/ DC converters, energy storage device and controller system, distributed generation resource is separately connected load by DC bus, two-way DC/DC becomes Parallel operation and control system, two-way DC/DC converters are also connected with energy storage device, and energy storage device is also connected with control system, control system It is also connected with two-way DC/DC converters.
Energy storage device includes that main control module, power module, immunity module, SOC estimation blocks, acquisition module, LCD are shown Module, communication module and PC machine, main control module be separately connected power module, immunity module, SOC estimation blocks, acquisition module, LCD display module and communication module, communication module are also connected with PC machine.
The present invention operation principle be:It is based on direct-current grid herein, using batteries to store energy device as research object, formulates Master-slave control strategy.Energy storage device battery management system is designed first, acquires the electric current, voltage, temperature of battery in real time Information estimates SOC;The two-way DC/DC converters of connection busbar and energy storage device are controlled later, according to mother Line voltage and energy storage device SOC states ensure that busbar voltage is stablized by controlling the flow direction of electric current, and microgrid power is flat Weighing apparatus finally carries out modeling and simulating, the validity of access control to total system.Specific research contents is as follows:
1. the characteristics of complicated for micro-capacitance sensor running environment, number of batteries is more, charging and discharging currents are big, there are electromagnetic interferences, design The battery management system of energy storage device acquires the electric current of accumulator, voltage, temperature and busbar voltage in real time.Work as mother When line voltage cannot meet loading demand, energy storage device will be used as power supply to provide electric energy for load, therefore, utilize core pivot element analysis Method calculates the SOC of energy storage device, makes energy storage device charge and discharge all in reasonable range, prevents super-charge super-discharge phenomenon, reach and prolong The purpose of long service lifetime of accumulator, and the control strategy for after provides foundation.
2. formulating master-slave control strategy according to collected parameter.It is from control, always with distributed generation resource in micro-capacitance sensor Keep maximum power output.And energy storage device, according to the situation of change of busbar voltage, utilizes backstepping sliding formwork control as main control Method carries out model selection to two-way DC/DC converters, to control the charge and discharge of energy storage device.
The model of total system is established in Matlab/simulink, simulates the different situations of micro-capacitance sensor busbar voltage, is seen Examine control effect.
1. energy storage device battery management system is studied:
Herein for the characteristic of micro-capacitance sensor, using accumulator as the energy-storage travelling wave tube of energy storage device, battery management system is designed, in real time Property aspect be used as focus on research direction, and by the electromagnetic signal of micro-capacitance sensor running environment interference take into account, design circuit When to interference be filtered.Accumulator SOC appraising models are established, SOC is estimated using core pivot element analysis KPCA algorithms It calculates.Battery management system overall structure is as shown in Figure 2.
2. master-slave control strategy is studied.
Master & slave control is implemented to energy storage device according to collected parameter.No matter whether busbar voltage meets the need of load It asks, the distributed generation resource in micro-capacitance sensor is used as from control, remains maximum power output.And energy storage device is as main control, According to busbar voltage state, selects the operating mode of two-way DC/DC and charge and discharge control is carried out to energy storage device, make busbar voltage It floats and is no more than ± 20%.
Due to the non-linear behavior of direct-current grid, backstepping theory is combined with sliding formwork control herein, to two-way DC/DC converters carry out backstepping sliding formwork control, it is made to carry out model selection automatically according to collected busbar voltage:When busbar electricity When pressing through high, controls it and enter Buck charge modes, electric current flows to energy storage device side to charge the battery from bus bar side, supervises at this time Accumulator SOC is surveyed, when SOC reaches SOCmax(It is set to 90% herein)When, stop charging immediately;When busbar voltage is too low, control It enters Boost discharge modes, and for electric current from energy storage device effluent to bus bar side, battery discharging monitors SOC, when SOC is less than SOCmin(It is set to 40% herein)When, stop electric discharge.The stabilization of busbar voltage and the balance of microgrid power are kept with this.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiment being appreciated that.

Claims (2)

1. a kind of direct-current grid energy storage device master & slave control system, which is characterized in that including distributed generation resource, two-way DC/DC Converter, energy storage device and controller system, distributed generation resource is separately connected load by DC bus, two-way DC/DC is converted Device and control system, two-way DC/DC converters are also connected with energy storage device, and energy storage device is also connected with control system, and control system is also Connect two-way DC/DC converters.
2. a kind of direct-current grid energy storage device master & slave control system according to claim 1, which is characterized in that the storage Energy device includes main control module, power module, immunity module, SOC estimation blocks, acquisition module, LCD display module, communication Module and PC machine, main control module are separately connected power module, immunity module, SOC estimation blocks, acquisition module, LCD and show mould Block and communication module, communication module are also connected with PC machine.
CN201810276292.XA 2018-03-30 2018-03-30 A kind of direct-current grid energy storage device master & slave control system Pending CN108418201A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110048497A (en) * 2019-04-23 2019-07-23 清华大学 The control method of direct-current grid
CN111016719A (en) * 2019-12-20 2020-04-17 江南大学 Method for controlling permanent uninterrupted flexible power supply by using electric automobile
CN112531693A (en) * 2020-11-27 2021-03-19 深圳市福光动力通信设备有限公司 Direct current side energy storage system capable of being directly connected in parallel and shared

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762610A (en) * 2014-01-07 2014-04-30 中国科学院电工研究所 Distributed energy storage system based on master-slave droop control
CN107482614A (en) * 2017-08-16 2017-12-15 南京国电南自电网自动化有限公司 Suitable for the voltage-controlled hybrid energy-storing control method of off-network type direct-current grid

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762610A (en) * 2014-01-07 2014-04-30 中国科学院电工研究所 Distributed energy storage system based on master-slave droop control
CN107482614A (en) * 2017-08-16 2017-12-15 南京国电南自电网自动化有限公司 Suitable for the voltage-controlled hybrid energy-storing control method of off-network type direct-current grid

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110048497A (en) * 2019-04-23 2019-07-23 清华大学 The control method of direct-current grid
CN110048497B (en) * 2019-04-23 2020-10-09 清华大学 Control method of direct-current micro-grid
CN111016719A (en) * 2019-12-20 2020-04-17 江南大学 Method for controlling permanent uninterrupted flexible power supply by using electric automobile
CN111016719B (en) * 2019-12-20 2021-07-27 江南大学 Method for controlling permanent uninterrupted flexible power supply by using electric automobile
CN112531693A (en) * 2020-11-27 2021-03-19 深圳市福光动力通信设备有限公司 Direct current side energy storage system capable of being directly connected in parallel and shared
CN112531693B (en) * 2020-11-27 2022-08-30 深圳市福光动力通信设备有限公司 Direct-current side energy storage system capable of being directly connected in parallel and shared

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Application publication date: 20180817