CN106410823B - Inhibit the system and method for new energy power station power swing - Google Patents
Inhibit the system and method for new energy power station power swing Download PDFInfo
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- CN106410823B CN106410823B CN201610842188.3A CN201610842188A CN106410823B CN 106410823 B CN106410823 B CN 106410823B CN 201610842188 A CN201610842188 A CN 201610842188A CN 106410823 B CN106410823 B CN 106410823B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 41
- 238000009825 accumulation Methods 0.000 claims abstract description 29
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims description 10
- 238000010248 power generation Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 abstract description 16
- 230000005764 inhibitory process Effects 0.000 description 6
- 239000013598 vector Substances 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000005619 thermoelectricity Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H02J3/382—
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- H02J3/383—
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- H02J3/386—
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides a kind of system and methods for inhibiting new energy power station power swing, the new energy power station includes energy accumulation current converter, new energy equipment, inverter and step-up transformer, the system comprises voltage sampling unit, the first computing unit, the second computing unit, compensation control unit and third computing units, wherein: the voltage sampling unit, for sampling inverter output voltage；First computing unit, for calculating the virtual voltage at current time；Second computing unit, for calculating inverter output current variable quantity；The compensation control unit, for making energy accumulation current converter output compensation electric current；The third computing unit, for calculating the offset voltage of inverter.The present invention compensates inverter output according to inverter output voltage variation, while guaranteeing adjustment speed, can effectively inhibit generation of electricity by new energy bring power swing.
Description
Technical field
The present invention relates to field of new energy generation, more specifically to a kind of inhibition new energy power station power swing
System and method.
Background technique
Compared with widely used conventional energy resource (such as coal, petroleum, natural gas, water energy), new energy in nature may be used
With constantly regenerating and regularly supplemented or reused, and new energy does not generate after consumption or seldom generates pollution
Object.But generation of electricity by new energy the defects of there is also randomnesss, fluctuation.With generations of electricity by new energy such as photovoltaic power generation, wind-power electricity generations
Greatly develop, new energy installed capacity increasingly increases.Correspondingly, randomness brought by generation of electricity by new energy and fluctuation problem
Also it gets worse.
To solve the problems, such as randomness and fluctuation brought by generation of electricity by new energy, the current general practice is to generation of electricity by new energy
System takes limit Power operation scheme to eliminate fluctuation, or in parallel with small-sized thermoelectricity to be inhibited by thermoelectricity power compensation
Fluctuation.
But since there are the losses of biggish generated energy after limitation operation power, thermoelectricity regulations speed is excessively slow and there are environmental protection to ask
Topic, more and more schemes tend to energy storage in parallel to inhibit to fluctuate.The practice generally used now is the electricity of energy storage acquisition grid entry point
Stream, and the current value by controlling grid entry point makes its stabilization, to achieve the purpose that inhibit generation of electricity by new energy fluctuation.Alternatively, using
Central controlled mode calculates total generation of electricity by new energy by the instant generated output of each new energy equipment of communication acquisition
Amount and fluctuating power, then by issuing compensation power to energy storage device, to achieve the purpose that inhibit fluctuation.
However, acquiring and controlling in the scheme of grid entry point electric current, external impressed current sampling apparatus is needed, and this equipment component needs
It additionally purchases and in-site installation is inconvenient, be also not suitable for the occasion of energy storage multi-machine parallel connection.In central controlled scheme, since power station is set
Standby more, communication relatively slowly (primary communication cycle rate is generally in second grade), causes a secondary control period longer, the inhibition to fluctuation
Not in time, the output power in power station is upper more stable in minute grade regulation but there are still very big power waves in second grade regulation
It is dynamic.
Summary of the invention
The technical problem to be solved in the present invention is that the problem larger for above-mentioned generation of electricity by new energy power swing, provides
A kind of system and method inhibiting new energy power station power swing.
The technical solution that the present invention solves above-mentioned technical problem, which is to provide, a kind of inhibits the new energy power station power swing to be
System, the new energy power station include energy accumulation current converter, new energy equipment, inverter and step-up transformer, and described new
Energy generating equipment is connected to power grid via inverter and step-up transformer, the energy accumulation current converter is connected to the boosting transformation
The input terminal of device, the system comprises voltage sampling unit, the first computing unit, the second computing unit, compensation control unit with
And third computing unit, in which: the voltage sampling unit, for sampling inverter output voltage；First computing unit,
For calculating the virtual voltage at inverter current time according to the output voltage and the offset voltage at current time at current time；Institute
The second computing unit is stated, for calculating inverter according to the virtual voltage and the virtual voltage at current time of inverter previous moment
Export current change quantity；The compensation control unit becomes energy accumulation current converter to boosting for the subsequent time at current time
The input terminal of depressor exports a compensation electric current identical as the inverter output current variable quantity amplitude, contrary；Institute
Third computing unit is stated, for calculating the offset voltage of inverter subsequent time according to the compensation electric current.
In the system of the present invention for inhibiting new energy power station power swing, the virtual voltage at current time is inversion
The phasor difference of the offset voltage of the output voltage and current time at device current time.
In the system of the present invention for inhibiting new energy power station power swing, the voltage sampling unit uses energy storage
The included voltage sampling apparatus of current transformer, first computing unit, the second computing unit, compensation control unit and third meter
It calculates unit and is integrated into energy accumulation current converter.
In the system of the present invention for inhibiting new energy power station power swing, the new energy equipment is photovoltaic
Battery, the inverter are photovoltaic DC-to-AC converter；Or the new energy equipment is wind-driven generator, the inverter is wind
Power power-generation inversion device.
The present invention also provides a kind of methods for inhibiting new energy power station power swing, and the new energy power station includes energy storage
Current transformer, new energy equipment, inverter and step-up transformer, and the new energy equipment is via inverter and boosting
Transformer is connected to power grid, the energy accumulation current converter is connected to the input terminal of the step-up transformer, and the method includes following
Step:
(a) output voltage at inverter current time is sampled, and according to the output voltage at current time and current time
The virtual voltage at offset voltage calculating inverter current time；
(b) inverter output current is calculated according to the virtual voltage of inverter previous moment and the virtual voltage at current time
Variable quantity；
(c) the subsequent time at current time make energy accumulation current converter to the input terminal of step-up transformer export one with it is described
Identical, the contrary compensation electric current of inverter output current variable quantity amplitude, and inverter is calculated according to the compensation electric current
The offset voltage of subsequent time.
In the method for the present invention for inhibiting new energy power station power swing, the virtual voltage at current time is inversion
The phasor difference of the offset voltage of the output voltage and current time at device current time.
In the method for the present invention for inhibiting new energy power station power swing, in the step (a), become by energy storage
Flow the output voltage at device included voltage sampling apparatus sampling inverter current time.
In the method for the present invention for inhibiting new energy power station power swing, the new energy equipment is photovoltaic
Battery, the inverter are photovoltaic DC-to-AC converter；Or the new energy equipment is wind-driven generator, the inverter is wind
Power power-generation inversion device.
The system and method for inhibition new energy power station power swing of the invention, according to inverter output voltage variation come pair
Inverter output compensates, and while guaranteeing adjustment speed, can effectively inhibit generation of electricity by new energy bring power swing.
Detailed description of the invention
Fig. 1 is the schematic diagram for the system embodiment that the present invention inhibits new energy power station power swing.
Fig. 2 is the schematic diagram that the present invention inhibits energy accumulation current converter embodiment in the system of new energy power station power swing.
Fig. 3 is the equipollent vectors figure of inverter output.
Fig. 4 is the flow diagram for the embodiment of the method that the present invention inhibits new energy power station power swing.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It as shown in Figure 1, 2, is the schematic diagram for the system embodiment that the present invention inhibits new energy power station power swing, this implementation
The system of the inhibition new energy power station power swing of example mainly solves the changed power bring fluctuation (power of minute grade in second grade
Fluctuation is solved by host computer centralized control).New energy power station in the present embodiment includes energy accumulation current converter 20, generation of electricity by new energy
Equipment 40, inverter 30 and step-up transformer 10, and new energy equipment 40 is connected to inverter 30, inverter 30 and energy storage
Current transformer 20 is in parallel, is connected to bulk power grid (i.e. general distribution network) by step-up transformer 10.Above-mentioned new energy equipment
40 can be photovoltaic cell or wind-force wind turbine etc., and photovoltaic DC-to-AC converter or wind power generation inversion then can be used in corresponding inverter 30
Device.New energy equipment 40, which generates electricity, to be realized simultaneously via power grid is sent into after inverter 30 and the conversion of step-up transformer 10
Net power generation.
Above-mentioned step-up transformer 10 can be equivalent to inductance in circuit, under this kind of topology, the phase of bulk power grid voltage,
Frequency and amplitude may be considered it is constant, will certainly be with the change of incoming current when the output power of inverter 30 changes
Change (since the present embodiment is mainly for uncontrollable chugging of inverter 30, thus only consider it is active, it is controllable without going to consider
Idle variation).When electric current changes, inductance (i.e. step-up transformer 10) both end voltage changes △ V=LS*I, phase angle
90 ° are differed with network voltage, wherein LS is the equivalent impedance of step-up transformer 10, and I is the output electric current of inverter 30.Also,
Since bulk power grid voltage not will receive the influence of power station power swing, the output power change of inverter 30 can bring inversion
The voltage-phase of 30 ac output end of device changes.As shown in figure 3, bulk power grid voltage vector U0, the exchange of existing inverter 30 is defeated
Causing inductive drop vector out is UL1, resultant vector U1；When electric current mutates, caused by the exchange output of inverter 30
Inductive drop vector becomes UL2, resultant vector U2, there is differential seat angle between the two is Δ θ.It therefore can be by sampling inversion
The voltage (i.e. the voltage of the input terminal of step-up transformer 10) of the output end of device 30, and the jump for detecting voltage-phase and amplitude is sentenced
The variable quantity of disconnected electric current out, to be converted into the variable quantity of power, then compensates changed power by energy accumulation current converter, so that grid-connected
Point power invariability.
The system of inhibition new energy power station power swing in the present embodiment includes that voltage sampling unit 21, first calculates list
First 22, second computing unit 23, compensation control unit 24 and third computing unit 25, above-mentioned voltage sampling unit 21 can be direct
The voltage check device carried using energy accumulation current converter 20, the first computing unit 22, the second computing unit 23, compensation control unit
24 and third computing unit 25 then can be integrated into energy accumulation current converter 20.Certainly, in practical applications, voltage sampling unit 21,
First computing unit 22, the second computing unit 23, compensation control unit 24 and third computing unit 25 can also be by independent hard
Part equipment and corresponding software sharing, and by the control output compensation power of energy accumulation current converter 20, so that grid entry point power invariability.
Voltage sampling unit 21 is used to sample the output voltage of inverter 30, i.e. the input terminal electricity of sampling step-up transformer 10
Pressure.The compensation that the output voltage that above-mentioned sampling obtains contains the voltage of the generation of inverter 30 and generated by energy accumulation current converter 20
Voltage.Above-mentioned voltage sampling unit 21 persistently carries out output voltage sampling, i.e., each sampling period, (sampling period can be as needed
Be arranged) all generate an inverter output voltage.
First computing unit 22 is used to be calculated according to the output voltage and the offset voltage at current time at current time current
The virtual voltage at moment.The virtual voltage at above-mentioned current time is the output voltage (sampling obtains) at the current time of inverter 30
With the phasor difference of the offset voltage at current time.Similarly, which persistently carries out virtual voltage calculating, calculates
The virtual voltage of acquisition is corresponding with the sampling period.
Second computing unit 23 was used for according to 30 previous moment of inverter (i.e. the previous sampling period of current sample period)
Virtual voltage V2 and the virtual voltage V1 at current time (i.e. current sample period) calculate inverter output current variation delta i
=i1-i2=(V1-V2)/LS.Similarly, the second computing unit 23 persistently calculates inverter output current variable quantity, and the value
It is corresponding with the sampling period.In the first sampling period and the second sampling period that system has just started, virtual voltage is that voltage is adopted
The inverter output current variable quantity of the voltage that the sampling of sample unit 21 obtains, the first sampling period uses zero.
Compensation control unit 24 is used to make energy accumulation current converter 20 to boosting transformation in subsequent time (i.e. next sampling period)
The input terminal of device 10 exports the current change quantity that one exports current time with inverter 30 and (is obtained by the calculating of the second computing unit 23
) identical, the contrary compensation electric current of amplitude.
Third computing unit 25 is used to calculate the offset voltage of inverter subsequent time according to compensation electric current.Third calculates single
Member 25 equally calculates offset voltage (the first sampling period for just having started in system and the of subsequent time in each sampling period
Zero) offset voltage in two sampling periods is.
The system of above-mentioned inhibition new energy power station power swing is adopted by the voltage check device that energy accumulation current converter 20 carries
The voltage of 30 output end of sample inverter judges the output electric current of inverter 30 by detecting the jump of voltage-phase and amplitude
Variable quantity, to be converted into the variable quantity of power, then changed power compensated by energy accumulation current converter 20, so that grid entry point power
It is constant.It is compared with existing scheme, above system reduces the current sampling device of external grid entry point, and it is difficult to greatly reduce installation
Degree, and ensure that regulations speed, it can effectively inhibit generation of electricity by new energy bring power swing.
As shown in figure 4, the present invention also provides a kind of method for inhibiting new energy power station power swing, wherein new energy power station
It include energy accumulation current converter, new energy equipment, inverter and step-up transformer, and new energy equipment is via inverter
Power grid is connected to step-up transformer, energy accumulation current converter is connected to the input terminal of step-up transformer.When new energy equipment is
Photovoltaic cell, inverter are photovoltaic DC-to-AC converter；When new energy equipment is wind-driven generator, inverter is wind power generation inversion
Device.The above method specifically includes the following steps:
Step S41: the output voltage at sampling inverter current time.In this step, it is carried by energy accumulation current converter
The output voltage at voltage sampling apparatus sampling inverter current time.
Step S42: the reality at current time is calculated according to the offset voltage at the output voltage at current time and current time
Voltage.In this step, the virtual voltage at current time is output voltage and the compensation at current time at inverter current time
The phasor difference of voltage.
Step S43: it is defeated that inverter is calculated according to the virtual voltage of inverter previous moment and the virtual voltage at current time
Current change quantity out.
Step S44: energy accumulation current converter is made to export one to the input terminal of step-up transformer in the subsequent time at current time
Compensation electric current identical as the inverter output current variable quantity amplitude, contrary, and inversion is calculated according to compensation electric current
The offset voltage of device subsequent time.
Above-mentioned steps S41~S44 is continuously carried out, thus the output according to voltage sample period (settable) to inverter
Power carries out continued compensation.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (8)
1. a kind of system for inhibiting new energy power station power swing, it is characterised in that: the new energy power station includes that energy storage becomes
Device, new energy equipment, inverter and step-up transformer are flowed, and the new energy equipment becomes via inverter and boosting
Depressor is connected to power grid, the energy accumulation current converter is connected to the input terminal of the step-up transformer, and the system comprises voltages to adopt
Sample unit, the first computing unit, the second computing unit, compensation control unit and third computing unit, in which: the voltage is adopted
Sample unit, for sampling inverter output voltage；First computing unit, for according to the output voltage at current time and working as
The offset voltage at preceding moment calculates the virtual voltage at inverter current time；Second computing unit, for according to inverter
The virtual voltage and the virtual voltage at current time of previous moment calculate inverter output current variable quantity；The compensation control is single
Member makes energy accumulation current converter export one and the inversion to the input terminal of step-up transformer for the subsequent time at current time
Device exports identical, the contrary compensation electric current of current change quantity amplitude；The third computing unit, for according to the compensation
The offset voltage of electric current calculating inverter subsequent time.
2. the system according to claim 1 for inhibiting new energy power station power swing, it is characterised in that: the reality at current time
Border voltage is the output voltage at inverter current time and the phasor difference of the offset voltage at current time.
3. the system according to claim 1 for inhibiting new energy power station power swing, it is characterised in that: the voltage sample
The voltage sampling apparatus that unit uses energy accumulation current converter to carry, first computing unit, the second computing unit, compensation control are single
Member and third computing unit are integrated into energy accumulation current converter.
4. the system according to claim 1 for inhibiting new energy power station power swing, it is characterised in that: the new energy hair
Electric equipment is photovoltaic cell, and the inverter is photovoltaic DC-to-AC converter；Or the new energy equipment is wind-driven generator, institute
Stating inverter is wind power generation inverter.
5. a kind of method for inhibiting new energy power station power swing, it is characterised in that: the new energy power station includes that energy storage becomes
Device, new energy equipment, inverter and step-up transformer are flowed, and the new energy equipment becomes via inverter and boosting
Depressor is connected to power grid, the energy accumulation current converter is connected to the input terminal of the step-up transformer, and the method includes following steps
It is rapid:
(a) output voltage at inverter current time is sampled, and according to the compensation of the output voltage at current time and current time
The virtual voltage at voltage calculating inverter current time；
(b) inverter output current variation is calculated according to the virtual voltage of inverter previous moment and the virtual voltage at current time
Amount；
(c) energy accumulation current converter is made to export one and the inversion to the input terminal of step-up transformer in the subsequent time at current time
Device exports identical, the contrary compensation electric current of current change quantity amplitude, and is calculated one under inverter according to the compensation electric current
The offset voltage at moment.
6. the method according to claim 5 for inhibiting new energy power station power swing, it is characterised in that: the reality at current time
Border voltage is the output voltage at inverter current time and the phasor difference of the offset voltage at current time.
7. the method according to claim 5 for inhibiting new energy power station power swing, it is characterised in that: the step (a)
In, the output voltage at inverter current time is sampled by the voltage sampling apparatus that energy accumulation current converter carries.
8. the method according to claim 5 for inhibiting new energy power station power swing, it is characterised in that: the new energy hair
Electric equipment is photovoltaic cell, and the inverter is photovoltaic DC-to-AC converter；Or the new energy equipment is wind-driven generator, institute
Stating inverter is wind power generation inverter.
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| CN108667042A (en) * | 2017-04-01 | 2018-10-16 | 周锡卫 | A kind of the generation of electricity by new energy inverter and system of the regulation and control that are suitable for linking |
| CN108695861A (en) * | 2017-04-05 | 2018-10-23 | 周锡卫 | A kind of the inverter sync control device and system of generation of electricity by new energy and energy storage complementation |
| CN111038112B (en) * | 2019-12-31 | 2021-06-08 | 江门市得实计算机外部设备有限公司 | Method for reducing influence of power supply voltage fluctuation on printing quality on thermal printing head |
| CN112769154B (en) * | 2020-12-30 | 2023-09-05 | 厦门科华数能科技有限公司 | Compensation control method and device for energy storage converter and terminal equipment |
| CN116316586B (en) * | 2023-03-15 | 2023-10-10 | 国网湖北省电力有限公司随州供电公司 | Method for tracing power jump in power system by adopting jump analysis method |
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