CN104426232A - Off-grid type photovoltaic energy storage system and intelligent conversion control method - Google Patents
Off-grid type photovoltaic energy storage system and intelligent conversion control method Download PDFInfo
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- CN104426232A CN104426232A CN201310367271.6A CN201310367271A CN104426232A CN 104426232 A CN104426232 A CN 104426232A CN 201310367271 A CN201310367271 A CN 201310367271A CN 104426232 A CN104426232 A CN 104426232A
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- inverter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses an off-grid type photovoltaic energy storage system and an intelligent conversion control method. The system comprises a photovoltaic assembly, a battery, an inverter, a user load and an intelligent conversion control apparatus, wherein the photovoltaic assembly and the battery are connected with the inverter simultaneously. The inverter is connected with the moving contact of a first breaker through a first contactor, the static contact of the first breaker is simultaneously connected with a second contactor and the moving contact of a third breaker, the static contact of the third breaker is connected with the user load, the second contactor is also connected with the moving contact of a second breaker, and the static contact of the second breaker is connected with a power network. According to the invention, automatic switching, intelligent switching and online switching among photovoltaic assembly, the battery and the power network are realized, the safety and reliability of the off-grid photovoltaic energy storage system of a user are improved, and at the same time, the intelligent conversion control apparatus improves the flexibility, diversity, redundancy and economic benefits of the electricity consumption of the user.
Description
Technical field
The present invention relates to technical field of electric power, refer in particular to a kind of from net type photovoltaic energy storage system and intelligent conversion control method.
Background technology
Following defect is there is in existing family from net type photovoltaic energy storage system.
1. power-supplying forms unification, when system runs into the problems such as weather, photovoltaic module, battery or fault, cannot provide electric energy by other forms to user;
2., at electrical network covering area, cannot realize switching from net type photovoltaic energy storage system with electrical network intelligence, be independently from net type photovoltaic energy storage system substantially with electrical network, user the two can only select one, cannot realize intelligence and automatically switch.
3. cannot automatically realize electricity consumption economy, in step price and time-of-use tariffs area, the collocation of different electricity price and photovoltaic energy storage system that user cannot realize electrical network uses, to reach the Best Economy of electricity consumption.
China Patent Publication No. CN102969731A, publication date on March 13rd, 2013, discloses a kind of distribution type photovoltaic energy storage system in the patent of invention that name is called " a kind of distribution type photovoltaic energy storage system ", comprising: energy-storage units and monitoring unit; Described monitoring unit, is connected with power network dispatching system, for accepting the dispatch command that power network dispatching system sends, described dispatch command is handed down to energy-storage units; Described energy-storage units comprises: two-way inverter, for the dispatch command issued according to described monitoring unit, when the grid-connected output AC electricity of photovoltaic generating system gives supply network, switch to grid-connect mode, the alternating current of input is converted to direct current and exports to battery pile, when photovoltaic generating system stops output AC electricity to supply network, switch to island mode, the direct current that battery pile exports is converted to alternating current and exports to supply network; Battery pile, for storing the direct current that two-way inverter exports, or exports to combining inverter by the direct current that self stores; Battery management system, for detecting the running status of battery pile, and carries out protect and manage according to detection data to battery pile.This system can solve the harmful effect can piled bulk power grid when the intermittence of existing distributed generation system and instability problem have reduced access and produce, but its weak point is, intelligence can not be carried out between electrical network and photovoltaic energy storage system switch, use and still have larger restriction.
Summary of the invention
The object of the invention is to overcome in prior art comparatively single from net type photovoltaic energy storage system power supply form, the shortcoming switched with electrical network intelligence from net type photovoltaic energy storage system cannot be realized, there is provided a kind of from net type photovoltaic energy storage system and intelligent conversion control method, can make to realize electrical network, battery, photovoltaic module automatically switch and to power to domestic consumer.
The object of the invention is to be achieved by following technical proposals:
A kind of from net type photovoltaic energy storage system, comprise photovoltaic module, battery, inverter, user load and intelligent conversion control device, photovoltaic module is connected with inverter with battery simultaneously, inverter is connected with user load with electrical network simultaneously, be connected with the first contactor between inverter and user load, be connected with the second contactor between electrical network and user load, the first contactor, the second contactor are also connected with intelligent conversion control device simultaneously.
Photovoltaic module is mounted in the solar photovoltaic assembly that domestic consumer roof or family's annex fully can receive the place of illumination, under illumination condition, can produce photovoltaic generation; Battery is as stand-by power supply, and storage of electrical energy, outside photovoltaic module and electrical network, can power to household load as the alternative supply power mode of one; The core of intelligent conversion control device is microprocessor control system and DC/DC, DC/AC change system composition, the switch of contactor is controlled by the microprocessor software in intelligent conversion control device and hardware system, realizes electrical network, battery, photovoltaic automatically switch and to power to domestic consumer.
As a kind of preferred version, the first circuit breaker, the second circuit breaker and the 3rd circuit breaker is also comprised from net type photovoltaic energy storage system, inverter is connected by the moving contact of the first contactor with the first circuit breaker, the fixed contact of the first circuit breaker is connected with the moving contact of the second contactor with the 3rd circuit breaker simultaneously, the fixed contact of the 3rd circuit breaker is connected with user load, second contactor is also connected with the moving contact of the second circuit breaker, and the fixed contact of the second circuit breaker is connected with electrical network.Circuit breaker is a kind of existing hand switch effect, automatically can carry out again decompression, under-voltage, overload and the electrical equipment of short-circuit protection, be used for realizing hardware protection and distributing electric energy in inverter, grid side and load-side.Before normal work, circuit breaker needs manual closing.
A kind of from net type photovoltaic energy storage system intelligence switching control method, based on the intelligent conversion control device from net type photovoltaic energy storage system, comprise the following steps: the first step, device judges from net type photovoltaic energy storage system it is that photovoltaic module or battery are powered to user load or electrical network is powered to user load by switching state machine, if system is when photovoltaic module or battery are to user load power supply state, jump to second step, if system is when electrical network is to user load power supply state, jump to the 4th step;
Second step, if photovoltaic energy storage system monitoring cannot provide power load to photovoltaic module, battery or break down, then jumps to the 3rd step, if photovoltaic energy storage system monitoring is normal to photovoltaic module, battery apparatus, then continues to keep monitoring;
3rd step, intelligent conversion control device sends control signal, and control the contactor of closed grid side, then cut off the contactor of inverter side, now the alternating current of grid side exports user load end to;
4th step, if photovoltaic energy storage system monitoring is abnormal to electrical network, then jumps to the 5th step, if photovoltaic energy storage system monitoring is normal to electrical network, then continues to keep monitoring;
5th step, intelligent conversion control device sends control signal, first the contactor of control inverter side closes, then the contactor controlling grid side effectively disconnects, now, the AC alternating current of household load is become to export family's load to from inverter side through the photovoltaic module of inverter conversion or the DC DC voltage conversion of battery.
As a kind of preferred version, second step be photovoltaic energy storage system acceptance set to user switching command time, jump to the 3rd step.User can programme setting switching to realize time-of-use tariffs and step price control switching.
As a kind of preferred version, the 4th step be photovoltaic energy storage system acceptance set to user switching command time, jump to the 5th step.User can programme setting switching to realize time-of-use tariffs and step price control switching.
As a kind of preferred version, 3rd step detailed process be intelligent conversion control device first send control signal grid side contactor close, after some time time delay, inverter blocks PWM, the now DC/AC conversion of inverter stops, in the mechanical time process that grid side contactor is closed, inverter is blocked by control contactor and pwm signal and disconnects the action of inverter side contactor software and hardware, completes by the automatic switchover of inverter power supply to mains supply pattern.
As a kind of preferred version, 5th step detailed process be intelligent conversion control device first send control signal inverter side contactor close, after some time time delay, PWM starts working, the now DC/AC conversion of inverter starts, in the mechanical time process that inverter side contactor is closed, inverter is blocked by control contactor and pwm signal and disconnects the action of grid side contactor software and hardware, completes by the automatic switchover of mains supply to inverter power supply pattern.
The invention has the beneficial effects as follows:
1. work in coordination with to the solution of customer power supply from net type photovoltaic energy storage system and electrical network, solve diversity and the flexibility of user power utilization;
2. the automatic switchover between photovoltaic module, battery, electrical network, intelligence switch and not suspension switches, and improve the security reliability of user from net photovoltaic energy storage system;
3. intelligent conversion control device improves the flexibility of user power utilization, diversity, redundancy and economy.
Accompanying drawing explanation
Fig. 1 is a kind of inverter of the present invention, circuit theory connection layout between electrical network and load;
Fig. 2 is the flow chart that inverter side of the present invention automatically switches to grid side;
Fig. 3 is the flow chart that grid side of the present invention automatically switches to inverter side.
Wherein: 1, inverter, 2, electrical network, 3, user load, the 4, first contactor, the 5, second contactor, the 6, first circuit breaker, the 7, second circuit breaker, the 8, the 3rd circuit breaker.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment: a kind of from net type photovoltaic energy storage system, comprises photovoltaic module, battery, inverter 1, user load 3 and intelligent conversion control device, and photovoltaic module is connected with inverter with battery simultaneously.Inverter, circuit theory connection layout between electrical network and load are as shown in Figure 1, inverter is connected by the moving contact of the first contactor 4 with the first circuit breaker 6, the fixed contact of the first circuit breaker is connected with the moving contact of the second contactor 5 with the 3rd circuit breaker 8 simultaneously, the fixed contact of the 3rd circuit breaker 8 is connected with user load, second contactor is also connected with the moving contact of the second circuit breaker 7, and the fixed contact of the second circuit breaker is connected with electrical network 2.Inverter is PCS inverter.
A kind of from net type photovoltaic energy storage system intelligence switching control method, based on the intelligent conversion control device from net type photovoltaic energy storage system, comprise the following steps: the first step, device judges from net type photovoltaic energy storage system it is that photovoltaic module or battery are powered to user load or electrical network is powered to user load by switching state machine, if system is when photovoltaic module or battery are to user load power supply state, jump to second step, if system is when electrical network is to user load power supply state, jump to the 4th step;
Second step, if photovoltaic energy storage system monitoring cannot provide power load to photovoltaic module, battery or break down, or photovoltaic energy storage system acceptance set to user switching command time, then jump to the 3rd step, if photovoltaic energy storage system monitoring is normal to photovoltaic module, battery apparatus, then continue to keep monitoring;
3rd step, intelligent conversion control device sends control signal, and control the contactor of closed grid side, then cut off the contactor of inverter side, now the alternating current of grid side exports user load end to;
4th step, if photovoltaic energy storage system monitoring is abnormal to electrical network, or photovoltaic energy storage system acceptance set to user switching command time, then jump to the 5th step, if photovoltaic energy storage system monitoring is normal to electrical network, then continuation maintenance is monitored;
5th step, intelligent conversion control device sends control signal, first the contactor of control inverter side closes, then the contactor controlling grid side effectively disconnects, now, the AC alternating current of household load is become to export family's load to from inverter side through the photovoltaic module of inverter conversion or the DC DC voltage conversion of battery.
3rd step detailed process as shown in Figure 2, when photovoltaic module or battery are powered to user load, switching state machine judges whether to enter automatic switchover mode, automatically switch if do not need, photovoltaic module or battery continue to power to user load, if desired automatically switch, then intelligent conversion control device first send control signal grid side contactor close, after 50ms time delays, inverter blocks PWM, the now DC/AC conversion of inverter stops, in the 50ms mechanical time process that grid side contactor is closed, inverter is blocked by control contactor and pwm signal and disconnects the action of inverter side contactor software and hardware, complete by the automatic switchover of inverter power supply to mains supply pattern.
The IGBT power device adopted due to the DC/AC inversion control of inverter realizes PWM control, blocking the time controling of pwm signal stopping DC/AC power stage in 100us grade, therefore the not suspension achieving below 10ms (the half power cycle) time in handoff procedure switches, thus ensure that the continuity of user power utilization and ensured normal work and the safe operation of user power utilization device.After completing normal switching; inverter startup load-side program of supervisory control system; the abnormal conditions (as short circuit etc.) of monitoring load; the safety is extremely there is in order to protect user load; inverter can cut off the contactor of grid side when load abnormal; suspend electrical network and provide power supply to abnormal load, to ensure user security.
5th step detailed process as shown in Figure 3, when electrical network is powered to user load, switching state machine judges whether to enter automatic switchover mode, automatically switch if do not need, electrical network continues to power to user load, if desired automatically switch, then intelligent conversion control device first send control signal inverter side contactor close, after 50ms time delays, PWM starts working, the now DC/AC conversion of inverter starts, in the 50ms mechanical time process that inverter side contactor is closed, inverter is by control contactor and disconnect the action of grid side contactor software and hardware, complete by the automatic switchover of inverter power supply to mains supply pattern.
Claims (7)
1. one kind from net type photovoltaic energy storage system, it is characterized in that, comprise photovoltaic module, battery, inverter, user load and intelligent conversion control device, photovoltaic module is connected with inverter with battery simultaneously, inverter is connected with user load with electrical network simultaneously, be connected with the first contactor between inverter and user load, be connected with the second contactor between electrical network and user load, the first contactor, the second contactor are also connected with intelligent conversion control device simultaneously.
2. one according to claim 1 is from net type photovoltaic energy storage system, it is characterized in that, also comprise the first circuit breaker, the second circuit breaker and the 3rd circuit breaker, inverter is connected by the moving contact of the first contactor with the first circuit breaker, the fixed contact of the first circuit breaker is connected with the moving contact of the second contactor with the 3rd circuit breaker simultaneously, the fixed contact of the 3rd circuit breaker is connected with user load, second contactor is also connected with the moving contact of the second circuit breaker, and the fixed contact of the second circuit breaker is connected with electrical network.
3., from a net type photovoltaic energy storage system intelligence switching control method, based on the intelligent conversion control device from net type photovoltaic energy storage system described in claim 1 or 2, it is characterized in that, comprise the following steps:
The first step, device judges whether to need switching state by switching state machine monitoring, if desired judge from net type photovoltaic energy storage system it is that photovoltaic module or battery are powered to user load or electrical network is powered to user load during switching state again, if when not needing switching state, switching state machine continues monitoring, if system is when photovoltaic module or battery are to user load power supply state, jump to second step, if system is when electrical network is to user load power supply state, jump to the 4th step;
Second step, if photovoltaic energy storage system monitoring cannot provide power load to photovoltaic module, battery or break down, then jumps to the 3rd step, if photovoltaic energy storage system monitoring is normal to photovoltaic module, battery apparatus, then continues to keep monitoring;
3rd step, intelligent conversion control device sends control signal, and control the contactor of closed grid side, then cut off the contactor of inverter side, now the alternating current of grid side exports user load end to;
4th step, if photovoltaic energy storage system monitoring is abnormal to electrical network, then jumps to the 5th step, if photovoltaic energy storage system monitoring is normal to electrical network, then continues to keep monitoring;
5th step, intelligent conversion control device sends control signal, first the contactor of control inverter side closes, then the contactor controlling grid side effectively disconnects, now, the AC alternating current of household load is become to export family's load to from inverter side through the photovoltaic module of inverter conversion or the DC DC voltage conversion of battery.
4. one according to claim 3 is from net type photovoltaic energy storage system intelligence switching control method, it is characterized in that, described second step be photovoltaic energy storage system acceptance set to user switching command time, jump to the 3rd step.
5. one according to claim 3 is from net type photovoltaic energy storage system intelligence switching control method, it is characterized in that, the 4th described step be photovoltaic energy storage system acceptance set to user switching command time, jump to the 5th step.
6. one according to claim 5 is from net type photovoltaic energy storage system intelligence switching control method, it is characterized in that, the 3rd described step detailed process be intelligent conversion control device first send control signal grid side contactor close, after some time time delay, inverter blocks PWM, the now DC/AC conversion of inverter stops, in the mechanical time process that grid side contactor is closed, inverter is blocked by control contactor and pwm signal and disconnects the action of inverter side contactor software and hardware, complete by the automatic switchover of inverter power supply to mains supply pattern.
7. want one described in 5 from net type photovoltaic energy storage system intelligence switching control method according to right, it is characterized in that, the 5th described step detailed process be intelligent conversion control device first send control signal inverter side contactor close, after some time time delay, PWM starts working, the now DC/AC conversion of inverter starts, in the mechanical time process that inverter side contactor is closed, inverter is blocked by control contactor and pwm signal and disconnects the action of grid side contactor software and hardware, complete by the automatic switchover of mains supply to inverter power supply pattern.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106655493A (en) * | 2016-11-08 | 2017-05-10 | 苏州爱康能源工程技术股份有限公司 | Remote power amount isolating and driving apparatus |
| CN107069825A (en) * | 2017-05-25 | 2017-08-18 | 河南迎基太阳能科技有限公司 | Distributed intelligence photovoltaic energy storage system |
| CN113629852A (en) * | 2021-08-20 | 2021-11-09 | 江苏亿万物联科技有限公司 | Method for using photovoltaic electric energy and auxiliary electricity in complementary manner as power source of hydrogen production equipment |
| CN117691685A (en) * | 2024-02-04 | 2024-03-12 | 深圳戴普森新能源技术有限公司 | Intelligent regulation and control system for photovoltaic inverter |
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| CN117691685A (en) * | 2024-02-04 | 2024-03-12 | 深圳戴普森新能源技术有限公司 | Intelligent regulation and control system for photovoltaic inverter |
| CN117691685B (en) * | 2024-02-04 | 2024-04-23 | 深圳戴普森新能源技术有限公司 | Intelligent regulation and control system for photovoltaic inverter |
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