CN105048486A - Controller of parallel interconnection battery energy storage system and control method of system - Google Patents
Controller of parallel interconnection battery energy storage system and control method of system Download PDFInfo
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- CN105048486A CN105048486A CN201510596868.7A CN201510596868A CN105048486A CN 105048486 A CN105048486 A CN 105048486A CN 201510596868 A CN201510596868 A CN 201510596868A CN 105048486 A CN105048486 A CN 105048486A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The invention discloses a controller of a parallel interconnection battery energy storage system and a control method of the system. The system comprises battery packs of different types and capacities, a plurality of converters, a detection and conversion control unit, an LCL filter and the like and is connected to a power grid in a module parallel connection mode, and through detection and conversion matched with the converters and the control unit, the operation states of the converters can be controlled, so that the system can operate in different modes. The converters are of a two-way extension control structure and are composed of isolation type two-way DC/DC converter bodies and DC/AC inverter modules. Fully-controlled bridges H1, transformers T, electric reactors LT and fully-controlled bridges H2 form the isolation type DC/DC converter bodies. Fully-controlled bridges H3 and LCL filters form the DC/AC inverter modules. Direct-current side capacitance serves as voltage support. The controller of the parallel interconnection battery energy storage system is flexible in structure and capable of achieving energy interaction with the energy storage system under the normal condition of the power grid and meanwhile achieving inverter output under the abnormal condition of the power grid, provides an emergency power source for important loads and guarantees flow equalization among all the converters.
Description
Technical field
The present invention relates to the correlative technology field such as power electronics, energy storage, be specifically related to a kind of grid-connected battery energy storage system controller in parallel and control method thereof.
Background technology
Battery energy storage technology effectively can increase conventional electric power system " flexibility ", is therefore widely used in electric power system, and especially in distributed power generation, new forms of energy, uninterrupted power supply, quality of power supply improvement etc., application prospect is very wide.Grid-connected battery energy storage system in parallel has a series of advantage, but it is also proposed higher requirement to its control technology.In view of this, this patent proposes a kind of grid-connected battery energy storage system Controller gain variations in parallel, construct a kind of grid-connected battery energy storage system in parallel, this system is convenient to modularized design and flexible expansion, can use as traditional energy-storage system, also there is emergency function, detailed design has been carried out to the controller under each pattern in system.
Summary of the invention
The object of the present invention is to provide a kind of grid-connected battery energy storage system controller in parallel and control method thereof;
A kind of grid-connected battery energy storage system controller in parallel, this system comprises dissimilar and the battery pack of capacity, multiple current transformer, formation such as detection conversion control unit and LCL filter etc., be connected to the grid by wired in parallel mode, the detection supporting with current transformer, conversion and control unit can control current transformer running status, thus system is run in different modes, it is characterized in that:
Current transformer have employed two-way expansion control structure, be made up of isolation type bidirectional DC/DC converter and DC/AC inverter module, wherein fully controlled bridge H1, transformer T, reactor LT and fully controlled bridge H2 form isolated DC/DC converter, fully controlled bridge H3 and LCL filter form DC/AC inverter module, make voltage support by DC bus capacitor.
Grid-connected battery energy storage system controller in parallel adopts three layers of hierarchy of control framework, whole system is divided into state recognition, Systematical control and signal to export three layers.
State recognition layer is analyzed mainly through signals such as the voltage to transducer collection, electric currents, and the operating state of certainty annuity and pattern, produce corresponding control signal to Systematical control layer; Systematical control layer mainly calls various control algolithm, produces pwm control signal to signal output layer; Signal output layer produces the driving pulse of each switching tube, realizes the switch motion of switching tube.
Pattern one is electrical network accumulator cell charging and discharging control model under normal circumstances, and pattern two is the contingency mode under electric network fault.
At electrical network under normal circumstances, by isolated form DC/DC converter and grid-connected DC/AC inverter control, realize accumulator cell charging and discharging and control.
This system applied voltage outer shroud and current inner loop double-closed-loop control, Voltage loop mainly carries out storage battery pressure-controlled and DC bus-bar voltage controls, selected by charge and discharge mode, obtain corresponding current reference signal, with real system current ratio comparatively, send into current PI adjuster, through PWM, output signal to DC/DC converter.
Under accumulator cell charging and discharging control model, grid-connected current Waveform Control assisted by DC/AC inverter, DC bus-bar voltage signal is through voltage PI regulator, obtain grid-connected current reference signal, compared with power network current actual signal, through current PI adjuster, output signal and isosceles triangle wave carry out SPWM modulation, obtain the switching signal of DC/AC converter.
When electrical network is abnormal, system works is in contingency mode, support without line voltage, battery energy storage device forms parallel module, powered to important load by DC/AC, now to ensure system current-sharing, control structure, this system outer shroud adopts power ring, inner ring adopts Voltage loop, average active power and actual active power compare, send into power P I regulator, average reactive power and reality is idle compares, send into power P I regulator, pass through COMPREHENSIVE CALCULATING, draw grid-connected voltage reference signal, compared with actual signal, through voltage PI regulator, output signal carries out SPWM modulation, obtain inverter control signal.
This grid-connected battery energy storage system control structure is flexible, the energetic interaction with energy-storage system can be realized under normal circumstances at electrical network, inversion can be realized export simultaneously under electrical network abnormal conditions, for important load provides emergency power supply, ensure the current-sharing between each current transformer.
Accompanying drawing explanation
Fig. 1 grid-connected battery energy storage system structure chart in parallel;
Fig. 2 cooperation control architecture figure;
DC/DC convertor controls structure chart under Fig. 3 accumulator cell charging and discharging control model;
DC/AC inverter control structures figure under Fig. 4 accumulator cell charging and discharging control model;
DC/AC inverter control structures figure under Fig. 5 contingency mode.
Embodiment
The present invention program can be understood better to make to be engaged in battery energy storage system control technology pertinent art, with reference to the accompanying drawings embodiment of the present invention being described in detail.
A kind of grid-connected battery energy storage system controller in parallel, this system comprises dissimilar and the battery pack of capacity, multiple current transformer, formation such as detection conversion control unit and LCL filter etc., be connected to the grid by wired in parallel mode, the detection supporting with current transformer, conversion and control unit can control current transformer running status, thus system is run in different modes, it is characterized in that:
Current transformer have employed two-way expansion control structure, be made up of isolation type bidirectional DC/DC converter and DC/AC inverter module, wherein fully controlled bridge H1, transformer T, reactor LT and fully controlled bridge H2 form isolated DC/DC converter, fully controlled bridge H3 and LCL filter form DC/AC inverter module, make voltage support by DC bus capacitor.
Grid-connected battery energy storage system controller in parallel adopts three layers of hierarchy of control framework, whole system is divided into state recognition, Systematical control and signal to export three layers.
State recognition layer is analyzed mainly through signals such as the voltage to transducer collection, electric currents, and the operating state of certainty annuity and pattern, produce corresponding control signal to Systematical control layer; Systematical control layer mainly calls various control algolithm, produces pwm control signal to signal output layer; Signal output layer produces the driving pulse of each switching tube, realizes the switch motion of switching tube.
Pattern one is electrical network accumulator cell charging and discharging control model under normal circumstances, and pattern two is the contingency mode under electric network fault.
At electrical network under normal circumstances, by isolated form DC/DC converter and grid-connected DC/AC inverter control, realize accumulator cell charging and discharging and control.
This system applied voltage outer shroud and current inner loop double-closed-loop control, Voltage loop mainly carries out storage battery pressure-controlled and DC bus-bar voltage controls, selected by charge and discharge mode, obtain corresponding current reference signal, with real system current ratio comparatively, send into current PI adjuster, through PWM, output signal to DC/DC converter.
Under accumulator cell charging and discharging control model, grid-connected current Waveform Control assisted by DC/AC inverter, DC bus-bar voltage signal is through voltage PI regulator, obtain grid-connected current reference signal, compared with power network current actual signal, through current PI adjuster, output signal and isosceles triangle wave carry out SPWM modulation, obtain the switching signal of DC/AC converter.
When electrical network is abnormal, system works is in contingency mode, support without line voltage, battery energy storage device forms parallel module, powered to important load by DC/AC, now to ensure system current-sharing, control structure, this system outer shroud adopts power ring, inner ring adopts Voltage loop, average active power and actual active power compare, send into power P I regulator, average reactive power and reality is idle compares, send into power P I regulator, pass through COMPREHENSIVE CALCULATING, draw grid-connected voltage reference signal, compared with actual signal, through voltage PI regulator, output signal carries out SPWM modulation, obtain inverter control signal.
This grid-connected battery energy storage system control structure is flexible, the energetic interaction with energy-storage system can be realized under normal circumstances at electrical network, inversion can be realized export simultaneously under electrical network abnormal conditions, for important load provides emergency power supply, ensure the current-sharing between each current transformer.
Grid-connected battery energy storage system structure in parallel as shown in Figure 1, this system is converted control unit and LCL filter etc. formed by dissimilar and the battery pack of capacity, multiple converter cell, detection, be connected to the grid by wired in parallel mode, the detection supporting with current transformer, conversion and control unit can control current transformer running status, thus system is run in different modes.Current transformer adopts two-way expansion control structure, be made up of isolation type bidirectional DC/DC converter and DC/AC inverter module, wherein fully controlled bridge H1, transformer T, reactor LT and fully controlled bridge H2 form isolated DC/DC converter, fully controlled bridge H3 and LCL filter form DC/AC inverter module, make voltage support by DC bus capacitor.
Control to realize system coordination, necessary control strategy must be taked, this patent proposes to adopt layer hierarchy of control framework of three shown in Fig. 2, state recognition, Systematical control and signal whole system is divided into export three layers, wherein state recognition layer is analyzed mainly through signals such as the voltage to transducer collection, electric currents, the operating state of certainty annuity and pattern, produce corresponding control signal to Systematical control layer; Systematical control layer mainly calls various control algolithm, produces pwm control signal to signal output layer; Signal output layer produces the driving pulse of each switching tube, realizes the switch motion of switching tube.
At electrical network under normal circumstances, by isolated form DC/DC converter and grid-connected DC/AC inverter control, accumulator cell charging and discharging is realized.Under accumulator cell charging and discharging control model, DC/DC convertor controls structure as shown in Figure 3, this system applied voltage outer shroud and current inner loop double-closed-loop control, Voltage loop mainly carries out storage battery pressure-controlled and DC bus-bar voltage controls, selected by charge and discharge mode, obtain corresponding current reference signal, and real system current ratio comparatively, send into current PI adjuster, through PWM, output signal to DC/DC converter.Under accumulator cell charging and discharging control model, grid-connected current Waveform Control assisted by DC/AC inverter, its specific strategy as shown in Figure 4, DC bus-bar voltage signal is through voltage PI regulator, obtain grid-connected current reference signal, compared with power network current actual signal, through current PI adjuster, output signal and isosceles triangle wave carry out SPWM modulation, obtain the switching signal of DC/AC converter.
When electrical network is abnormal, system works is in contingency mode, support without line voltage, battery energy storage device forms parallel module, powered to important load by DC/AC, now to ensure system current-sharing, adopt the control structure shown in Fig. 5, this system outer shroud adopts power ring, inner ring adopts Voltage loop, average active power and actual active power compare, send into power P I regulator, average reactive power and reality is idle compares, send into power P I regulator, pass through COMPREHENSIVE CALCULATING, draw grid-connected voltage reference signal, compared with actual signal, through voltage PI regulator, output signal carries out SPWM modulation, obtain inverter control signal.This grid-connected battery energy storage system control structure is flexible, the energetic interaction with energy-storage system can be realized under normal circumstances at electrical network, inversion can be realized export simultaneously under electrical network abnormal conditions, for important load provides emergency power supply, ensure the current-sharing between each current transformer.
A kind of grid-connected battery energy storage system controller in parallel and control method thereof, the present invention relates to the correlative technology field such as power electronics, energy storage, be specifically related to grid-connected battery energy storage system Controller gain variations in parallel.Give grid-connected battery energy storage system structure chart in parallel, be incorporated into the power networks to realize battery energy storage system parallel connection, and can higher flexibility and extensibility be ensured, current transformer adopts two-way expansion control structure, be made up of isolation type bidirectional DC/DC converter and DC/AC inverter module, make voltage support by DC bus capacitor.Adopt three layers of hierarchy of control framework to realize system coordination to control, whole system be divided into state recognition, Systematical control and signal to export three layers.This system can be designed as two kinds of patterns, and pattern one is electrical network accumulator cell charging and discharging control model under normal circumstances, and pattern two is the contingency mode under electric network fault.Give electrical network under normal circumstances, by isolated form DC/DC converter and grid-connected DC/AC inverter control, realize accumulator cell charging and discharging and control.When electrical network is abnormal, system works, in contingency mode, supports without line voltage, and battery energy storage device forms parallel module, is powered, give concrete control mode by DC/AC to important load.This grid-connected battery energy storage system control structure is flexible, the energetic interaction with energy-storage system can be realized under normal circumstances at electrical network, inversion can be realized export simultaneously under electrical network abnormal conditions, for important load provides emergency power supply, ensure the current-sharing between each current transformer.
See Fig. 1, present system provides a grid-connected battery energy storage system structure chart of parallel connection.This system is converted control unit and LCL filter etc. formed by dissimilar and the battery pack of capacity, multiple converter cell, detection, be connected to the grid by wired in parallel mode, the detection supporting with current transformer, conversion and control unit can control current transformer running status, thus system is run in different modes.Current transformer adopts two-way expansion control structure, be made up of isolation type bidirectional DC/DC converter and DC/AC inverter module, wherein fully controlled bridge H1, transformer T, reactor LT and fully controlled bridge H2 form isolated DC/DC converter, fully controlled bridge H3 and LCL filter form DC/AC inverter module, make voltage support by DC bus capacitor.
See Fig. 2, present system provides cooperation control architecture figure, state recognition, Systematical control and signal whole system is divided into export three layers, wherein state recognition layer is analyzed mainly through signals such as the voltage to transducer collection, electric currents, the operating state of certainty annuity and pattern, produce corresponding control signal to Systematical control layer; Systematical control layer mainly calls various control algolithm, produces pwm control signal to signal output layer; Signal output layer produces the driving pulse of each switching tube, realizes the switch motion of switching tube.
See Fig. 3, present system provides DC/DC convertor controls structure chart under accumulator cell charging and discharging control model, this system applied voltage outer shroud and current inner loop double-closed-loop control, Voltage loop mainly carries out storage battery pressure-controlled and DC bus-bar voltage controls, and is selected by charge and discharge mode, obtains corresponding current reference signal, with real system current ratio comparatively, send into current PI adjuster, through PWM, output signal to DC/DC converter.
See Fig. 4, present system provides DC/AC inverter control structures figure under accumulator cell charging and discharging control model, grid-connected current Waveform Control assisted by DC/AC inverter, DC bus-bar voltage signal is through voltage PI regulator, obtain grid-connected current reference signal, compared with power network current actual signal, through current PI adjuster, output signal and isosceles triangle wave carry out SPWM modulation, obtain the switching signal of DC/AC converter.
See Fig. 5, present system provides DC/AC inverter control structures figure under contingency mode, this system outer shroud adopts power ring, inner ring adopts Voltage loop, and average active power and actual active power compare, and sends into power P I regulator, average reactive power and reality is idle compares, send into power P I regulator, by COMPREHENSIVE CALCULATING, draw grid-connected voltage reference signal, compared with actual signal, through voltage PI regulator, output signal carries out SPWM modulation, obtains inverter control signal.
Above content is the detailed description done the present invention in conjunction with optimal technical scheme, can not assert that the concrete enforcement of invention is only limitted to these, for not departing from the simple deduction and replacement made under inventive concept prerequisite, all should be considered as protection scope of the present invention.
Claims (8)
1. the grid-connected battery energy storage system controller of parallel connection, it is characterized in that: this system comprises dissimilar and the battery pack of capacity, multiple current transformer, formation such as detection conversion control unit and LCL filter etc., be connected to the grid by wired in parallel mode, the detection supporting with current transformer, conversion and control unit can control current transformer running status, thus system is run in different modes, it is characterized in that:
Current transformer have employed two-way expansion control structure, be made up of isolation type bidirectional DC/DC converter and DC/AC inverter module, wherein fully controlled bridge H1, transformer T, reactor LT and fully controlled bridge H2 form isolated DC/DC converter, fully controlled bridge H3 and LCL filter form DC/AC inverter module, make voltage support by DC bus capacitor.
2. one according to claim 1 grid-connected battery energy storage system controller in parallel, is characterized in that: grid-connected battery energy storage system controller in parallel adopts three layers of hierarchy of control framework, whole system is divided into state recognition, Systematical control and signal to export three layers.
3. one according to claim 2 grid-connected battery energy storage system controller in parallel, it is characterized in that: state recognition layer is analyzed mainly through signals such as the voltage to transducer collection, electric currents, the operating state of certainty annuity and pattern, produce corresponding control signal to Systematical control layer; Systematical control layer mainly calls various control algolithm, produces pwm control signal to signal output layer; Signal output layer produces the driving pulse of each switching tube, realizes the switch motion of switching tube.
4. the grid-connected battery energy storage system control method of parallel connection, is characterized in that: this system is two kinds of patterns, and pattern one is electrical network accumulator cell charging and discharging control model under normal circumstances, and pattern two is the contingency mode under electric network fault.
5. one according to claim 4 grid-connected battery energy storage system control method in parallel, is characterized in that: at electrical network under normal circumstances, by isolated form DC/DC converter and grid-connected DC/AC inverter control, realizes accumulator cell charging and discharging and controls.
6. one according to claim 5 grid-connected battery energy storage system control method in parallel, it is characterized in that: this system applied voltage outer shroud and current inner loop double-closed-loop control, Voltage loop mainly carries out storage battery pressure-controlled and DC bus-bar voltage controls, selected by charge and discharge mode, obtain corresponding current reference signal, and real system current ratio comparatively, send into current PI adjuster, through PWM, output signal to DC/DC converter.
7. one according to claim 5 grid-connected battery energy storage system control method in parallel, it is characterized in that: under accumulator cell charging and discharging control model, grid-connected current Waveform Control assisted by DC/AC inverter, DC bus-bar voltage signal is through voltage PI regulator, obtain grid-connected current reference signal, compared with power network current actual signal, through current PI adjuster, output signal and isosceles triangle wave carry out SPWM modulation, obtain the switching signal of DC/AC converter.
8. one according to claim 5 grid-connected battery energy storage system control method in parallel, it is characterized in that: when electrical network is abnormal, system works is in contingency mode, support without line voltage, battery energy storage device forms parallel module, powered to important load by DC/AC, now to ensure system current-sharing, control structure, this system outer shroud adopts power ring, inner ring adopts Voltage loop, average active power and actual active power compare, send into power P I regulator, average reactive power and reality is idle compares, send into power P I regulator, pass through COMPREHENSIVE CALCULATING, draw grid-connected voltage reference signal, compared with actual signal, through voltage PI regulator, output signal carries out SPWM modulation, obtain inverter control signal.
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| CN108448586A (en) * | 2018-04-04 | 2018-08-24 | 东北大学 | A kind of assessment of micro-capacitance sensor power supply quality and its simulation Load balanced control system and method |
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| CN114337309A (en) * | 2022-03-04 | 2022-04-12 | 广州疆海科技有限公司 | Bidirectional energy storage converter and bidirectional control method thereof |
| CN117614047A (en) * | 2024-01-24 | 2024-02-27 | 西安为光能源科技有限公司 | Medium-voltage direct-hanging data center power supply system |
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| CN113783260A (en) * | 2021-09-09 | 2021-12-10 | 山东大学 | Battery replacement station based on modular DC/DC converter and control method |
| CN113783260B (en) * | 2021-09-09 | 2023-08-08 | 山东大学 | Battery replacing station based on modularized DC/DC converter and control method |
| CN114337309A (en) * | 2022-03-04 | 2022-04-12 | 广州疆海科技有限公司 | Bidirectional energy storage converter and bidirectional control method thereof |
| CN117614047A (en) * | 2024-01-24 | 2024-02-27 | 西安为光能源科技有限公司 | Medium-voltage direct-hanging data center power supply system |
| CN117614047B (en) * | 2024-01-24 | 2024-03-29 | 西安为光能源科技有限公司 | Medium-voltage direct-hanging data center power supply system |
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