CN105262127A - Self-adaptive power control method of photovoltaic power generation hybrid energy storage system - Google Patents

Self-adaptive power control method of photovoltaic power generation hybrid energy storage system Download PDF

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Publication number
CN105262127A
CN105262127A CN201510596715.2A CN201510596715A CN105262127A CN 105262127 A CN105262127 A CN 105262127A CN 201510596715 A CN201510596715 A CN 201510596715A CN 105262127 A CN105262127 A CN 105262127A
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power
bus
energy storage
control
converter
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王武
张元敏
罗书克
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Xuchang University
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Xuchang University
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention discloses a self-adaptive power control method of a photovoltaic power generation hybrid energy storage system. The system comprises a hybrid energy storage device, a DC bus, an AC bus, converters and various loads, wherein the hybrid energy storage device comprises a photovoltaic cell array, a storage battery energy storage unit used for converting solar energy to electric energy, a supercapacitor energy storage unit and two energy storage power supplies, the storage battery energy storage unit and the supercapacitor energy storage unit are connected with the DC bus respectively through respective DC/DC converter, a photovoltaic power generation unit is connected to the AC bus through a DC/AC inverter, the DC bus passes through the DC/AC inverter to be connected with the AC bus, different control strategies are adopted, a storage battery DC/DC converter adopts power control, and a supercapacitor DC/DC converter is used for voltage control of the DC bus. The whole system adopts a self-adaptive power control strategy to achieve system coordination control, thus, the energy storage advantages of a storage battery and a supercapacitor are developed, and a good power throughput effect is obtained.

Description

A kind of adaptive power control method of photovoltaic generation mixed energy storage system
Technical field
The present invention relates to micro-capacitance sensor, renewable energy power generation and technical field of energy storage, be specifically related to a kind of adaptive power control method of photovoltaic generation mixed energy storage system.
Background technology
Micro-capacitance sensor controls distributed power source characteristic flexibly, and be that the strong of large-scale power grid supplements, play important role, develop and use promotion regenerative resource in electric power system, promotion energy-saving and emission-reduction and green electric power supply consumption provide a kind of effective way.Micro-capacitance sensor is connected to the grid, also independent operating.Along with renewable energy power generation capacity constantly increases, during micro-capacitance sensor islet operation, power fluctuation affects also further obvious on electric power netting safe running and the quality of power supply.Energy storage device is utilized to play the effect of stabilizing power fluctuation to a certain extent.But single energy storage device is difficult to the requirement meeting power control and energy management two aspect simultaneously.
Utilize the complementary characteristic of hybrid energy-storing, obtain the power stage that relative smooth is stable, avoid wind not to be that power supply and energy storage device access the power fluctuation caused.This patent proposes ultracapacitor to be combined with storage battery, form mixed energy storage system, by applying ADAPTIVE CONTROL, make micro-capacitance sensor energy-storage system under islet operation pattern have capability of fast response, thus meet quality of power supply requirement and load power demand when micro-capacitance sensor runs.
Summary of the invention
The object of the present invention is to provide a kind of adaptive power control method of photovoltaic generation mixed energy storage system.
An adaptive power control method for photovoltaic generation mixed energy storage system, this system is converted to electric energy by photovoltaic battery array-by solar energy, batteries to store energy unit, ultracapacitor energy storage unit-two accumulation power supplies form hybrid accumulator, DC bus, ac bus, converter and various load and form; Batteries to store energy unit is connected with DC bus by respective DC/DC converter with ultracapacitor energy storage unit, and photovoltaic generation unit is connected to ac bus by DC/AC inverter, and DC bus connects ac bus through DC/AC inversion, for load provides electric power; This system stored energy device have employed two cover DC/DC converters, DC/DC converter allows energy in bidirectional flow, and have employed different control strategies, storage batteries D C/DC converter adopts power to control, and ultracapacitor DC/DC converter is used for DC bus-bar voltage and controls.
This system includes storage batteries D C/DC converter, and battery tension detects, and by being divided by with its reference power signal, obtains reference current signal, controls brachium pontis, make it work in accumulator charging and discharging state according to its size; Meanwhile, this reference signal is compared with storage battery actual current signal, sends into PI current regulator, controls converter PWM and exports.
This system provides ultracapacitor DC/DC convertor controls topological diagram, ultracapacitor adopts voltage control, and by detecting DC bus-bar voltage, and reference voltage compares, send into voltage PI regulator, obtain current reference signal, this signal, for control DC/DC converter brachium pontis, realizes ultracapacitor charge and discharge control, simultaneously, this reference current signal is compared with ultracapacitor measured current signal, sends into current PI adjuster, and the PWM of control DC/DC converter exports.
Whole system have employed optimal energy allocation strategy, controls in order to realize system coordination; When micro-capacitance sensor is in islet operation, according to power demand change, the preferential compensation power vacancy of ultracapacitor, and by ADAPTIVE CONTROL, power shortage is progressively transferred to storage battery and bears; When DC bus-bar voltage is stablized, the power shortage of micro-capacitance sensor islet operation is all compensated by storage battery; When power shortage is excessive, when causing storage battery all to compensate, Ultracapacitor Energy Storage bears some residual vacancy power; When power shortage exceedes the power tolerance range of mixed energy storage system, then according to load condition, the secondary load of cut-out targetedly.
The present invention relates to micro-capacitance sensor, renewable energy power generation and technical field of energy storage, be specifically related to the control of mixed energy storage system in photovoltaic generating system, be mainly used in photovoltaic generating system and there are storage battery and ultracapacitor two kinds of hybrid accumulators, carry out adaptive power control.This patent gives the structure chart of photovoltaic generation mixed energy storage system, and this system is made up of photovoltaic battery array, batteries to store energy unit, ultracapacitor energy storage unit, DC bus, ac bus, converter and various loads etc.Batteries to store energy unit is connected with DC bus by respective DC/DC converter with ultracapacitor energy storage unit, storage batteries D C/DC converter adopts power to control, ultracapacitor DC/DC converter is used for DC bus-bar voltage and controls, thus achieves the different control strategies structures to mixed energy storage system.Photovoltaic generation unit is connected to ac bus by DC/AC inverter, and DC bus connects ac bus through DC/AC inversion, for load provides electric power.Whole system have employed optimal energy allocation strategy, controls, thus the advantage of batteries to store energy and ultracapacitor energy storage all brought into play, the power throughput prediction obtained in order to realize system coordination.
Accompanying drawing explanation
Fig. 1 photovoltaic generation mixed energy storage system structure chart;
Fig. 2 storage batteries D C/DC convertor controls topological diagram;
Fig. 3 ultracapacitor DC/DC convertor controls topological diagram.
Embodiment
In order to make to be engaged in photovoltaic power generation technology and energy storage technology pertinent art can understand the present invention program better, with reference to the accompanying drawings embodiment of the present invention is described in detail.
As shown in Figure 1, system is made up of photovoltaic battery array, batteries to store energy unit, ultracapacitor energy storage unit, DC bus, ac bus, converter and various loads etc. photovoltaic generation mixed energy storage system structure.Batteries to store energy unit is connected with DC bus by respective DC/DC converter with ultracapacitor energy storage unit, and photovoltaic generation unit is connected to ac bus by DC/AC inverter, and DC bus connects ac bus through DC/AC inversion, for load provides electric power.
Photovoltaic generation mixed energy storage system adopts DC/DC converter to add DC/AC inverter pattern, and wherein DC/DC converter allows energy in bidirectional flow, and storage battery and ultracapacitor adopt different control strategies.Storage battery is energy type energy storage device, and response speed is comparatively slow, and storage batteries D C/DC converter adopts power to control, and ultracapacitor has power handling capacity fast, and ultracapacitor DC/DC converter is used for DC bus-bar voltage and controls.Storage batteries D C/DC convertor controls topology as shown in Figure 2.Battery tension being detected, by being divided by with its reference power signal, obtaining reference current signal, control brachium pontis according to its size, make it work in accumulator charging and discharging state; Meanwhile, this reference signal is compared with storage battery actual current signal, sends into PI current regulator, controls converter PWM and exports.
Ultracapacitor DC/DC converter topology as shown in Figure 3, detect DC bus-bar voltage, compare with reference voltage, send into voltage PI regulator, obtain current reference signal, this signal is for control DC/DC converter brachium pontis, realize ultracapacitor charge and discharge control, meanwhile, this reference current signal is compared with ultracapacitor measured current signal, send into current PI adjuster, the PWM of control DC/DC converter exports.
When micro-capacitance sensor is in islet operation, lack the voltage of external power grid and frequency supports, to ultracapacitor and the certain optimal energy allocation strategy of accumulator hybrid energy-storing System Implementation, by the inner self-regulation of micro-capacitance sensor, the internal electric energy equilibrium of supply and demand must be kept.Concrete optimal energy allocation strategy is: when micro-capacitance sensor is in islet operation, change according to power demand, the preferential compensation power vacancy of ultracapacitor, and pass through ADAPTIVE CONTROL, power shortage is progressively transferred to storage battery to bear, like this, ultracapacitor does not need to carry out power control for a long time on the one hand, is easy to realize.On the other hand, storage battery power is handled up and is switched smoother, improves discharge and recharge effect.When DC bus-bar voltage is stablized, the power shortage of micro-capacitance sensor islet operation is all compensated by storage battery.When power shortage is excessive, when causing storage battery all to compensate, Ultracapacitor Energy Storage bears some residual vacancy power.When power shortage exceedes the power tolerance range of mixed energy storage system, then according to load condition, the secondary load of cut-out targetedly.
See Fig. 1, present system provides a photovoltaic generation mixed energy storage system structure chart, this system is made up of photovoltaic battery array, batteries to store energy unit, ultracapacitor energy storage unit, DC bus, ac bus, converter and various loads etc.Batteries to store energy unit is connected with DC bus by respective DC/DC converter with ultracapacitor energy storage unit, and photovoltaic generation unit is connected to ac bus by DC/AC inverter, and DC bus connects ac bus through DC/AC inversion, for load provides electric power.
See Fig. 2, present system provides storage batteries D C/DC convertor controls topological diagram, energy-storage system of accumulator adopts power to control, specific strategy is for detect battery tension, by being divided by with its reference power signal, obtain reference current signal, control brachium pontis according to its size, make it work in accumulator charging and discharging state; Meanwhile, this reference signal is compared with storage battery actual current signal, sends into PI current regulator, controls converter PWM and exports, actual according to system, Choice and design voltage and current detecting device and pi regulator parameter.
See Fig. 3, present system provides ultracapacitor DC/DC converter topology figure, ultracapacitor adopts voltage control, by detecting DC bus-bar voltage, compare with reference voltage, send into voltage PI regulator, obtain current reference signal, this signal is for control DC/DC converter brachium pontis, realize ultracapacitor charge and discharge control, simultaneously, this reference current signal is compared with ultracapacitor measured current signal, send into current PI adjuster, the PWM of control DC/DC converter exports, actual according to system, Choice and design voltage and current detecting device and pi regulator parameter.
Whole system have employed optimal energy allocation strategy: when micro-capacitance sensor is in islet operation, according to power demand change, and the preferential compensation power vacancy of ultracapacitor, and by ADAPTIVE CONTROL, power shortage is progressively transferred to storage battery and bears.When DC bus-bar voltage is stablized, the power shortage of micro-capacitance sensor islet operation is all compensated by storage battery.When power shortage is excessive, when causing storage battery all to compensate, Ultracapacitor Energy Storage bears some residual vacancy power.When power shortage exceedes the power tolerance range of mixed energy storage system, then according to load condition, the secondary load of cut-out targetedly.
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 (4)

1. an adaptive power control method for photovoltaic generation mixed energy storage system, is characterized in that: this system is converted to electric energy by photovoltaic battery array-by solar energy, batteries to store energy unit, ultracapacitor energy storage unit-two accumulation power supplies form hybrid accumulator, DC bus, ac bus, converter and various load and form; Batteries to store energy unit is connected with DC bus by respective DC/DC converter with ultracapacitor energy storage unit, and photovoltaic generation unit is connected to ac bus by DC/AC inverter, and DC bus connects ac bus through DC/AC inversion, for load provides electric power; This system stored energy device have employed two cover DC/DC converters, DC/DC converter allows energy in bidirectional flow, and have employed different control strategies, storage batteries D C/DC converter adopts power to control, and ultracapacitor DC/DC converter is used for DC bus-bar voltage and controls.
2. the adaptive power control method of a kind of photovoltaic generation mixed energy storage system according to claim 1, it is characterized in that: this system includes storage batteries D C/DC converter, battery tension detects, by being divided by with its reference power signal, obtain reference current signal, control brachium pontis according to its size, make it work in accumulator charging and discharging state; Meanwhile, this reference signal is compared with storage battery actual current signal, sends into PI current regulator, controls converter PWM and exports.
3. the adaptive power control method of a kind of photovoltaic generation mixed energy storage system according to claim 1, it is characterized in that: this system provides ultracapacitor DC/DC convertor controls topological diagram, ultracapacitor adopts voltage control, by detecting DC bus-bar voltage, compare with reference voltage, send into voltage PI regulator, obtain current reference signal, this signal is for control DC/DC converter brachium pontis, realize ultracapacitor charge and discharge control, simultaneously, this reference current signal is compared with ultracapacitor measured current signal, send into current PI adjuster, the PWM of control DC/DC converter exports.
4. according to the adaptive power control method of a kind of photovoltaic generation mixed energy storage system according to claim 1, it is characterized in that: whole system have employed optimal energy allocation strategy, control in order to realize system coordination; When micro-capacitance sensor is in islet operation, according to power demand change, the preferential compensation power vacancy of ultracapacitor, and by ADAPTIVE CONTROL, power shortage is progressively transferred to storage battery and bears; When DC bus-bar voltage is stablized, the power shortage of micro-capacitance sensor islet operation is all compensated by storage battery; When power shortage is excessive, when causing storage battery all to compensate, Ultracapacitor Energy Storage bears some residual vacancy power; When power shortage exceedes the power tolerance range of mixed energy storage system, then according to load condition, the secondary load of cut-out targetedly.
CN201510596715.2A 2015-12-18 2015-12-18 Self-adaptive power control method of photovoltaic power generation hybrid energy storage system Pending CN105262127A (en)

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Cited By (5)

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CN106451509A (en) * 2016-10-20 2017-02-22 山西大学 Energy management and control optimization method based on composite energy storage
CN107046290A (en) * 2017-03-17 2017-08-15 国网电力科学研究院武汉南瑞有限责任公司 A kind of polynary energy storage fusion method for improving regional power grid energy utilization rate
RU2629364C1 (en) * 2016-12-07 2017-08-29 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский университет "Московский институт электронной техники" Supercapacitor based on cmos technology
CN109309389A (en) * 2017-07-28 2019-02-05 许继集团有限公司 A kind of light-preserved system DC bus-bar voltage stable control method and control system
CN111342566A (en) * 2020-03-25 2020-06-26 西安电子科技大学 Resonance tracking type non-contact multi-path power supply device and power supply method

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CN104184159A (en) * 2014-06-28 2014-12-03 广东元景能源股份有限公司 Co-scheduling strategy for multiple energy storage in distributed light storage micro-gird system
CN104362656A (en) * 2014-10-24 2015-02-18 东南大学 Control method based on hybrid energy storage voltage source inverter (VSI) stabilizing microgrid power fluctuation

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Publication number Priority date Publication date Assignee Title
CN202737478U (en) * 2012-08-29 2013-02-13 中国能源建设集团广东省电力设计研究院 Combined energy storage apparatus suitable for seamless switching of micro-grid
CN104184159A (en) * 2014-06-28 2014-12-03 广东元景能源股份有限公司 Co-scheduling strategy for multiple energy storage in distributed light storage micro-gird system
CN104362656A (en) * 2014-10-24 2015-02-18 东南大学 Control method based on hybrid energy storage voltage source inverter (VSI) stabilizing microgrid power fluctuation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106451509A (en) * 2016-10-20 2017-02-22 山西大学 Energy management and control optimization method based on composite energy storage
CN106451509B (en) * 2016-10-20 2019-01-15 山西大学 Energy based on composite energy storage manages optimization method
RU2629364C1 (en) * 2016-12-07 2017-08-29 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский университет "Московский институт электронной техники" Supercapacitor based on cmos technology
CN107046290A (en) * 2017-03-17 2017-08-15 国网电力科学研究院武汉南瑞有限责任公司 A kind of polynary energy storage fusion method for improving regional power grid energy utilization rate
CN109309389A (en) * 2017-07-28 2019-02-05 许继集团有限公司 A kind of light-preserved system DC bus-bar voltage stable control method and control system
CN109309389B (en) * 2017-07-28 2021-06-08 许继集团有限公司 Method and system for controlling voltage stability of direct current bus of optical storage system
CN111342566A (en) * 2020-03-25 2020-06-26 西安电子科技大学 Resonance tracking type non-contact multi-path power supply device and power supply method

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