CN110289632A - A kind of new energy power grid control method - Google Patents
A kind of new energy power grid control method Download PDFInfo
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- CN110289632A CN110289632A CN201910312515.8A CN201910312515A CN110289632A CN 110289632 A CN110289632 A CN 110289632A CN 201910312515 A CN201910312515 A CN 201910312515A CN 110289632 A CN110289632 A CN 110289632A
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- energy
- power
- photovoltaic
- storage system
- pcs
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims abstract description 99
- 230000033228 biological regulation Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 abstract description 4
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000005286 illumination Methods 0.000 description 5
- 230000002045 lasting effect Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/385—
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
New energy power grid control method of the invention, the energy-storage system in parallel on photovoltaic system, it is connect through pcs system with power grid, determine that energy-storage system is in charged state according to photovoltaic active power of output, discharge condition, do not charge the yet not operating status of discharge condition, when photovoltaic output power residue, extra energy is enabled to be stored by energy-storage system charging, energy storage system discharges when photovoltaic output power deficiency, guarantee the continuous service in PCS, when energy-storage system is accessed or is exited, pcs system does not need to reconstruct, and convenient for being transplanted in existing photovoltaic generating system, overcome photovoltaic power generation intermittence and uncertain the drawbacks of bringing for power network fluctuation, guarantee the normal operation of power grid, structure is simple, input cost is low.
Description
Technical field
The present invention relates to the new energy power grid control sides that one of power technical field of electronic control improves PCS output power
Method.
Background technique
With the continuous adjustment of national energy structure policy, application of the photovoltaic generating system in network system is more and more wider
General, photovoltaic generating system is generally by photovoltaic system (Photovoltaic, PV) and power regulating system (Power Conversion
System, PCS) composition；The output power of traditional PCS photovoltaic system is influenced to change by environment temperature and intensity of illumination
When, power cannot make full use of；When intensity of illumination reduces, photovoltaic active power of output is reduced, and it is out of service to will lead to PCS；
When intensity of illumination is restored, photovoltaic active power of output increases, but PCS can not restart immediately, so that photovoltaic output has
Function power cannot be fully utilized；Topological structure in the prior art is divided into two kinds, one is energy-storage system directly with electricity
Net is connected, which can not power for PCS, and add additional the cost input of energy-storage system gird-connected inverter；Another
Energy-storage system is connected between DC/DC converter and PCS internal inverters, though the structure can power to PCS, due to energy storage system
The tie point of system is located inside PCS, need to rebuild PCS circuit, and system structure is complicated.
Summary of the invention
Pcs system can be continuously the technical problem to be solved by the invention is to provide one kind, energy is provided, it is ensured that PCS
Systems stay operation, structure is simple, the low new energy power grid control method of input cost.
New energy power grid control method of the invention, it is characterised in that: energy-storage system in parallel, photovoltaic system on photovoltaic system
It unites, the output end of energy-storage system is connected with control system；Photovoltaic system is connect through pcs system with power grid；
Control system obtains the active power and photovoltaic output voltage of photovoltaic system output, determines that energy-storage system is in charging shape
State, discharge condition, do not charge not discharge condition yet, and charge power, the discharge power of energy-storage system are set as constant, pcs system
Power also control as constant so that pcs system is run on always under MPPT mode, i.e. Maximum Power Point
Tracking, MPPT mode；
It is energy storage by extra energy when the current power needed for the active power of photovoltaic system output is greater than standard network load
System charging, the power characteristic of the power characteristic and pcs system that enable photovoltaic match；
When the current power needed for the active power of photovoltaic system output is less than standard network load, it is by energy storage system discharges
Pcs system provides energy, and pcs system is enabled to work in MPPT maximum power point tracking, to limit its discharge power；
The energy-storage system includes energy-storage travelling wave tube, and energy-storage travelling wave tube is in parallel after two-way DC/DC converter is connect with electric capacity of voltage regulation
It is connected to photovoltaic system, then accesses pcs system again, is finally connected with power grid by DC/DC converter, DC/AC converter, it is real
The access of existing photovoltaic system and energy-storage system；
The control system obtains photovoltaic active power of output and photovoltaic output voltage, when photovoltaic active power of output is greater than energy storage
When the charge power constant threshold of default, energy-storage system charging, by charge power instruction value and energy-storage travelling wave tube both end voltage
The current instruction value for flowing through energy-storage travelling wave tube is calculated, by adjusting the proportional integration module in electric current loop, so that flowing through energy storage
The current actual value of element follows instruction value, and the driving signal of the 2nd DC of two-way DC/DC converter is obtained by comparator；
When photovoltaic active power of output is less than the discharge power constant threshold of energy-storage system setting, energy storage system discharges, by light
Volt output voltage Upv tables look-up to obtain corresponding PCS active power of output reference value Ppcs*, and the value and photovoltaic export wattful power
Rate Ppv makees difference and can obtain discharge power instruction value Pdisch*, Pdisch* and Ubat and can be calculated to flow through the electric current of energy-storage travelling wave tube and refer to
Value Ibat* is enabled, by adjusting the PI in electric current loop, so that the current actual value Ibat for flowing through energy-storage travelling wave tube follows instruction value
Ibat* obtains the driving signal of the first DC of two-way DC/DC converter by comparator.
New energy power grid control method of the invention, energy-storage system in parallel, connects through pcs system and power grid on photovoltaic system
It connects, determines that energy-storage system is in charged state, discharge condition, do not charge also not discharge condition according to photovoltaic active power of output
Operating status enables energy storage system discharges, guarantees the continuous service of the PCS in photovoltaic output power deficiency；In photovoltaic output power
When remaining, extra energy is enabled to be stored by energy-storage system charging；It is PCS without additional configuration inverter
Lasting electric energy is provided, the discharge power curve of DC/DC converter is obeyed into photovoltaic power/voltage curve, so that PCS work always
Make in MPPT mode, be conducive to the output-power fluctuation that energy-storage system inhibits photovoltaic system, guarantees the steady of pcs system output power
It is fixed, it can be realized continuing working for PCS, when energy-storage system is accessed or exited, pcs system does not need to reconstruct, and convenient for moving
It plants in existing photovoltaic generating system, overcomes photovoltaic power generation intermittence and uncertain for power network fluctuation bring disadvantage
End, guarantees the normal operation of power grid, structure is simple, and input cost is low.
Detailed description of the invention
Fig. 1 is the system topology figure of new energy power grid control method of the embodiment of the present invention；
Fig. 2 is DC/DC translation circuit discharge power curve in the energy-storage system of new energy power grid control method of the embodiment of the present invention
Figure；
Fig. 3 is the energy-storage system charge and discharge control block diagram of new energy power grid control method of the embodiment of the present invention.
Specific embodiment
As shown, a kind of new energy power grid control method, energy-storage system is after DC/DC boosts and photovoltaic is in parallel, so
It accesses pcs system again afterwards, is finally connected with power grid by DC/DC converter with DC/AC converter, realize photovoltaic and energy storage system
The access of system, this structure are conducive to the output-power fluctuation that energy-storage system inhibits photovoltaic system, guarantee pcs system output power
Stabilization.Meanwhile, it is capable to realize continuing working for PCS, when energy-storage system is accessed or exited, PCS does not need to reconstruct, and is promoted
The availability of system.
When the current power needed for the active power of photovoltaic system output is less than standard network load, by energy storage system discharges
Energy is provided for PCS.The discharge power curve of energy-storage system DC/DC converter is as shown in Fig. 2, and PCS is enabled to work in maximum work
Rate point tracks (Maximum Power Point Tracking, MPPT) mode, to limit its discharge power.
When the current power needed for the active power of photovoltaic system output is greater than standard network load, it is by extra energy
Energy-storage system charging, the charge power of energy-storage system is controlled as constant, by the control block diagram of attached drawing 3 it is found that the power quilt of PCS
Control is constant, can run on always under MPPT mode, enable power characteristic phase of the power characteristic of photovoltaic with PCS
Match.
The invention discloses a kind of raising power regulating system (Power Conversion System, PCS) output powers
Energy storage system control method.Energy-storage system can provide lasting electric energy in photovoltaic active power of output deficiency for PCS, protect
Demonstrate,prove the normal operation of power grid.Energy-storage system is in parallel with photovoltaic, and the two is connected commonly through PCS with power grid, is exported by photovoltaic
Active power numerical value judges that energy-storage system is in that charged state, discharge condition, do not charge not discharge condition yet.When photovoltaic exports
Active power be less than load taken, energy storage system discharges, DC/DC converter discharge power curve obedience photovoltaic power/
Voltage curve, so that PCS works in MPPT mode；It is taken when photovoltaic active power of output is greater than load, energy-storage system charging,
By control strategy enable energy-storage system charge power be constant so that photovoltaic characteristics of output power in PCS power characteristic most
High-power point matches.
The utility model has the advantages that the present invention is between photovoltaic and PCS by connecting energy-storage system, so that when photovoltaic active power of output is big
It is taken in load, extra energy is stored；It is taken when photovoltaic active power of output is less than load, is by energy storage
PCS provides energy, guarantees its continuous service.It when so that intensity of illumination changing, can guarantee the continuous service of PCS, and be power grid
Continuous energy is provided.
Fig. 1 is system overall topology, and photovoltaic is in parallel with energy-storage system, is connected by PCS with power grid.Energy-storage system
In, energy-storage travelling wave tube is connected by two-way DC/DC converter with electric capacity of voltage regulation, in parallel with photovoltaic.When two-way DC/DC converter
2nd DC S2 conducting, when the first DC S1 of two-way DC/DC converter is turned off, two-way DC/DC converter work is in booster circuit
(Boost), energy-storage travelling wave tube works in the charge state；When the 2nd DC S2 of two-way DC/DC converter is turned off, two-way DC/DC becomes
When the first DC S1 conducting of parallel operation, two-way DC/DC converter work is being discharged in reduction voltage circuit (Buck), energy-storage travelling wave tube work
Under state.
The control method of above-mentioned energy-storage system, specific as follows:
Photovoltaic active power of output Ppv and photovoltaic output voltage Upv are obtained by control system, judges that energy-storage system is in charging
State, discharge condition, do not charge not discharge condition yet.
When the active-power P pv of photovoltaic output is greater than set energy-storage system charge power threshold value, energy-storage system fills
The current-order for flowing through energy-storage travelling wave tube is calculated by charge power instruction value Pchg* and energy-storage travelling wave tube both end voltage Ubat for electricity
Value Ibat*, by adjusting the proportional integration module (PI) in electric current loop so that flow through the current actual value Ibat of energy-storage travelling wave tube with
With instruction value Ibat*, the driving signal of the 2nd DC S2 of two-way DC/DC converter is obtained by comparator.
When the active-power P pv of photovoltaic output is less than set energy storage system discharges power threshold, energy-storage system is put
Electricity is tabled look-up to obtain corresponding PCS active power of output reference value Ppcs* by photovoltaic output voltage Upv, and the value and photovoltaic export
Active-power P pv makees difference and can obtain discharge power instruction value Pdisch*, Pdisch* and Ubat and can be calculated to flow through energy-storage travelling wave tube
Current instruction value Ibat*, by adjusting the PI in electric current loop, so that the current actual value Ibat for flowing through energy-storage travelling wave tube follows instruction
Value Ibat* obtains the driving signal of the first DC S1 of two-way DC/DC converter by comparator.
The above method judges the operating status of energy-storage system according to photovoltaic active power of output Ppv, enables energy storage system discharges,
Guarantee the continuous service of the PCS in photovoltaic output power deficiency；In photovoltaic output power residue, enabled by energy-storage system charging more
Remaining energy is stored.The structure provides lasting electric energy for PCS, and just without additional configuration inverter
In being transplanted in existing photovoltaic generating system, photovoltaic power generation intermittence is overcome to a certain extent and uncertain for power grid wave
The drawbacks of dynamic property is brought.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
1, by the way that energy-storage system is connected in parallel on photovoltaic two sides, it is connected jointly by PCS with power grid, so that in intensity of illumination
When variation causes photovoltaic active power of output to change, energy-storage system can provide lasting energy for PCS, and power grid is held in guarantee
Continuous power supply.
2, energy-storage system is connected in parallel on photovoltaic two sides, which opens up compared to what energy-storage system was directly connected with power grid
It flutters, lasting energy can be provided for PCS, and avoid additional increase inverter；DC/DC is connected to compared to by energy-storage system
Topology between converter and PCS internal inverters, without rebuilding PCS, convenient for being transplanted in existing photovoltaic generating system.
3, it is taken when the active power of photovoltaic output is less than load, energy storage system discharges provide energy, control storage to PCS
The DC/DC converter discharge power curve approximation of energy system is equal to photovoltaic MPPT curve of output, and PCS is enabled to work in MPPT mode.
4, it being taken when photovoltaic active power of output is greater than load, extra energy is energy-storage system charging, by controlling,
The charge power for enabling energy-storage system is constant, and PCS is kept to run on MPPT mode, make the characteristic curve of photovoltaic output power with
The power characteristic of PCS matches, and charging is completed in the case where not interfering maximum photovoltaic power point to track.
Claims (3)
1. new energy power grid control method of the invention, it is characterised in that: energy-storage system in parallel, photovoltaic system on photovoltaic system
It unites, the output end of energy-storage system is connected with control system；Photovoltaic system is connect through pcs system with power grid；
Control system obtains the active power and photovoltaic output voltage of photovoltaic system output, determines that energy-storage system is in charging shape
State, discharge condition, do not charge not discharge condition yet, and charge power, the discharge power of energy-storage system are set as constant, pcs system
Power also control as constant so that pcs system is run on always under MPPT mode, i.e. Maximum Power Point
Tracking, MPPT mode；
It is taken when the active power of photovoltaic system output is greater than load, is energy-storage system charging by extra energy, enables photovoltaic
Power characteristic and the power characteristic of pcs system match；
It is taken when the active power of photovoltaic system output is less than load, provides energy by energy storage system discharges for pcs system, enable
Pcs system works in MPPT maximum power point tracking, to limit its discharge power.
2. new energy power grid control method according to claim 1, it is characterised in that: the energy-storage system includes energy storage member
Part, energy-storage travelling wave tube are connected in parallel to photovoltaic system, then access PCS again after two-way DC/DC converter is connect with electric capacity of voltage regulation
System finally connects with power grid by DC/DC converter, DC/AC converter, realizes the access of photovoltaic system and energy-storage system.
3. new energy power grid control method according to claim 1, it is characterised in that: the control system obtains photovoltaic output
Active power and photovoltaic output voltage, when photovoltaic active power of output is greater than the charge power constant threshold of energy-storage system setting
When, the electric current for flowing through energy-storage travelling wave tube is calculated by charge power instruction value and energy-storage travelling wave tube both end voltage for energy-storage system charging
Instruction value, by adjusting the proportional integration module in electric current loop, so that the current actual value for flowing through energy-storage travelling wave tube follows instruction value,
The driving signal of the 2nd DC of two-way DC/DC converter is obtained by comparator；
When photovoltaic active power of output is less than the discharge power constant threshold of energy-storage system setting, energy storage system discharges, by light
Volt output voltage Upv tables look-up to obtain corresponding PCS active power of output reference value Ppcs*, and the value and photovoltaic export wattful power
Rate Ppv makees difference and can obtain discharge power instruction value Pdisch*, Pdisch* and Ubat and can be calculated to flow through the electric current of energy-storage travelling wave tube and refer to
Value Ibat* is enabled, by adjusting the PI in electric current loop, so that the current actual value Ibat for flowing through energy-storage travelling wave tube follows instruction value
Ibat* obtains the driving signal of the first DC of two-way DC/DC converter by comparator.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564168A (en) * | 2020-12-07 | 2021-03-26 | 广东电网有限责任公司佛山供电局 | Light storage system and maximum power point tracking control method thereof |
| CN113612272A (en) * | 2021-07-19 | 2021-11-05 | 科华数据股份有限公司 | Charging control method and device for uninterruptible power supply of new energy power generation system |
| CN116072998A (en) * | 2023-03-06 | 2023-05-05 | 宁德时代新能源科技股份有限公司 | Communication method, device, system, equipment, medium and product of energy storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810858A (en) * | 2015-05-27 | 2015-07-29 | 广西大学 | Control method for grid-connected power generation system of optical storage microgrid |
| CN107872070A (en) * | 2016-09-27 | 2018-04-03 | 比亚迪股份有限公司 | Photovoltaic microgrid system and its control method |
-
2019
- 2019-04-18 CN CN201910312515.8A patent/CN110289632A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810858A (en) * | 2015-05-27 | 2015-07-29 | 广西大学 | Control method for grid-connected power generation system of optical storage microgrid |
| CN107872070A (en) * | 2016-09-27 | 2018-04-03 | 比亚迪股份有限公司 | Photovoltaic microgrid system and its control method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564168A (en) * | 2020-12-07 | 2021-03-26 | 广东电网有限责任公司佛山供电局 | Light storage system and maximum power point tracking control method thereof |
| CN113612272A (en) * | 2021-07-19 | 2021-11-05 | 科华数据股份有限公司 | Charging control method and device for uninterruptible power supply of new energy power generation system |
| CN113612272B (en) * | 2021-07-19 | 2024-01-02 | 科华数据股份有限公司 | Charging control method and device for uninterruptible power supply of new energy power generation system |
| CN116072998A (en) * | 2023-03-06 | 2023-05-05 | 宁德时代新能源科技股份有限公司 | Communication method, device, system, equipment, medium and product of energy storage system |
| CN116072998B (en) * | 2023-03-06 | 2023-08-11 | 宁德时代新能源科技股份有限公司 | Communication method, device, system, equipment, medium and product of energy storage system |
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Application publication date: 20190927 |