CN110311428A - A kind of intelligent photovoltaic inverter power regulating system - Google Patents
A kind of intelligent photovoltaic inverter power regulating system Download PDFInfo
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- CN110311428A CN110311428A CN201910536141.8A CN201910536141A CN110311428A CN 110311428 A CN110311428 A CN 110311428A CN 201910536141 A CN201910536141 A CN 201910536141A CN 110311428 A CN110311428 A CN 110311428A
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- 238000004886 process control Methods 0.000 claims description 2
- 238000011897 real-time detection Methods 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
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Classifications
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- H02J3/383—
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention discloses a kind of intelligent photovoltaic inverter power regulating systems, including photovoltaic inversion device assembly, photovoltaic DC-to-AC converter monitoring system and photovoltaic DC-to-AC converter Reactive-power control system, wherein, photovoltaic inversion device assembly is used to direct current power be converted to AC power, and configures power and quickly adjust on the spot and remote control function；Photovoltaic DC-to-AC converter monitoring system, for carrying out real-time monitoring and power closed-loop control to photovoltaic DC-to-AC converter operating condition；Photovoltaic DC-to-AC converter Reactive-power control system is used in grid entry point voltage out-of-limit, carries out Reactive-power control to network voltage.The present invention quickly adjusts idle power output using inverter in real time by the cooperation between monitoring device and regulator control system, to effectively improve grid-connected voltage level, voltage is avoided to occur fluctuating excessive situation.
Description
Technical field
The present invention relates to a kind of intelligent photovoltaic inverter power regulating systems, belong to photovoltaic DC-to-AC converter technical field.
Background technique
With the fast development of new energy power generation technology, photovoltaic DC-to-AC converter is widely applied in photovoltaic plant, flexible intelligence
Photovoltaic DC-to-AC converter and intelligent control technology are increasingly becoming the research direction in the field, however used photovoltaic is inverse currently on the market
Become device power regulating system and but there are certain drawbacks when in use, not only lack the monitoring device of science, but also lacks and adjust
The closed power regulating system for spending system interlink, can not achieve quick floating voltage fluctuation and idle power output is adjusted.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of intelligent photovoltaic inverter power regulating system, can be with
Effectively solve photovoltaic inverter grid-connected system in the presence of voltage fluctuation, it is out-of-limit the problems such as.
In order to achieve the above objectives, the technical solution adopted by the present invention are as follows:
A kind of intelligent photovoltaic inverter power regulating system, which is characterized in that supervised including photovoltaic inversion device assembly, photovoltaic DC-to-AC converter
Control system and photovoltaic DC-to-AC converter Reactive-power control system；
The photovoltaic inversion device assembly is used to direct current power be converted to AC power, and configures power and quickly adjust on the spot and remote
Process control function；
The photovoltaic DC-to-AC converter monitoring system, for carrying out real-time monitoring and power closed-loop control to photovoltaic DC-to-AC converter operating condition；Institute
It states photovoltaic DC-to-AC converter monitoring system to be made of central control equipment and sub-control control equipment, different points of the central control equipment convergence
The metric data for controlling equipment, generates and issues power control instruction, voltage, electricity of the sub-control control equipment to photovoltaic DC-to-AC converter
Galvanic electricity tolerance carries out real-time monitoring, calculate realtime power value and on send to central control equipment, while receiving and implementation center's control
The power control instruction of control equipment；
The photovoltaic DC-to-AC converter Reactive-power control system is used in grid entry point voltage out-of-limit, carries out Reactive-power control to network voltage.
Photovoltaic inversion device assembly above-mentioned is made of boosting circuit and inversion bridge type return；The boosting circuit is photovoltaic battle array
DC voltage needed for the dc voltage boost of column to inverter output control, the inversion bridge type return is then straight after boosting
Galvanic electricity pressure is converted to the alternating voltage of mains frequency.
Photovoltaic inversion device assembly above-mentioned is based on non-inverting output alternating voltage.
Adapter in photovoltaic inversion device assembly above-mentioned realizes pulsewidth modulation using PWM integrated manipulator；The PWM collection
TL5001 chip is used at controller.
Photovoltaic DC-to-AC converter Reactive-power control system above-mentioned carries out Reactive-power control to network voltage, comprising: by photovoltaic DC-to-AC converter
Rated capacity and active calculation of capacity MPPT redundancy capacity calculate idle control reference current according to the instruction value issued, by electricity
Flow control circuit drives IGBT to realize switch controlled, realizes photovoltaic DC-to-AC converter Reactive-power control.
Photovoltaic DC-to-AC converter Reactive-power control system configuration constant power factor, permanent reactive power and constant voltage above-mentioned control three kinds
Reactive-power control control model.
Under invariable power factor controlling mode above-mentioned, inverter output power factor is constant, by adjusting inverter output
Reactive power maintain grid entry point power factor (PF) it is constant；Under the perseverance Reactive Power Control mode, inverter exports idle function
Rate is constant, and the reactive power for directly controlling inverter output maintains the reactive power of grid entry point constant；The constant voltage mode control
Under system, reactive voltage curve is preset, by central control equipment real-time detection grid entry point voltage, when voltage ripple of power network, is moved
State adjusts inverter output reactive power size, to maintain grid entry point voltage constant.
Under perseverance Reactive Power Control mode above-mentioned, the output reactive power that inverter is arranged is 0~± 100% specified nothing
Function power.
Led between central control equipment above-mentioned and sub-control control equipment by cable, optical fiber or wireless various ways
Letter.
Compared with prior art, the beneficial effects of the present invention are: the present invention can be used as the Auxiliary support of voltage control and regulation
System provides full-automatic fast power regulating measure for the operation control of photovoltaic plant, ensures that voltage, can be effective in reasonable interval
The workload for mitigating regulation personnel, improves voltage-operated reliability and stability comprehensively.Meanwhile the present invention sufficiently excavated it is inverse
Become the redundancy Reactive-power control ability of device to the support effect of voltage, enhance practicability of the invention, has before promoting well
Scape.
Detailed description of the invention
Fig. 1 is Reactive Power Control flow diagram of the present invention；
Fig. 2 is photovoltaic DC-to-AC converter monitoring system workflow schematic diagram of the present invention；
Fig. 3 is photovoltaic DC-to-AC converter Reactive-power control system voltage control flow schematic diagram of the present invention.
Specific embodiment
The invention will be further described below.Following embodiment is only used for clearly illustrating technical side of the invention
Case, and not intended to limit the protection scope of the present invention.
Direct current is converted to that alternating current is grid-connected by inverter, is one of the important device of alterating and direct current force transformation, inverter
By DC voltage needed for the dc voltage boost of photovoltaic array to inverter output control, to reach inverter to photovoltaic battle array
The voltage close loop of column controls, and avoids photovoltaic array from occurring in output voltage abnormal.Such inverter is used for photovoltaic generating system
In, therefore referred to as photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter in addition to straight exchange conversion function, also have automatic running, stopping function and
Maximal power tracing control function.
The present invention provides a kind of intelligent photovoltaic inverter power regulating system, by photovoltaic inversion device assembly, photovoltaic DC-to-AC converter
Monitoring system and photovoltaic DC-to-AC converter Reactive-power control system composition.
Photovoltaic inversion device assembly is a kind of power converter being made of semiconductor devices and regulating device, is mainly used for handle
Direct current power is converted to AC power, is generally made of boosting circuit and inversion bridge type return, and configuration power is quickly adjusted on the spot
And remote control function.Boost direct current needed for dc voltage boost to inverter output control of the circuit photovoltaic array
Pressure, inversion bridge type return are then converted to the DC voltage after boosting the alternating voltage of conventional frequency.
Photovoltaic DC-to-AC converter monitoring system is made of central control equipment and sub-control control equipment, wherein central control equipment converges
The metric data for gathering different sub-control control equipments, generates and issues power control instruction；Electricity of the sub-control control equipment to photovoltaic DC-to-AC converter
The electrical quantity such as pressure, electric current carry out real-time monitoring, calculate realtime power value and on send to central control equipment or intelligent control single
Member, while the power control instruction of simultaneously implementation center's control equipment is received, adjust the idle power output of inverter, workflow such as Fig. 2
It is shown.Distinct device can be communicated by the various ways such as cable, optical fiber, wireless, realize the reality to photovoltaic DC-to-AC converter operating condition
When monitoring and power closed-loop control.
Photovoltaic DC-to-AC converter Reactive-power control system has Reactive-power control ability, and when grid entry point voltage out-of-limit, inverter is utilized
Voltage is adjusted in its Reactive-power control ability.
Power control control flow is as shown in Figure 1, control inverter output current realizes idle output, output electric current and electricity
Full active power is exported when net voltage in phase, output reactive power when exporting advanced electric current or lagging voltage.
Photovoltaic DC-to-AC converter component voltage control flow is as shown in figure 3, by photovoltaic DC-to-AC converter rated capacity and active volumeter
MPPT redundancy capacity is calculated, idle control reference current is calculated according to the instruction value issued, it is real by current control loop driving IGBT
Existing switch controlled, realizes the Reactive-power control of inverter power output.
Three kinds of photovoltaic DC-to-AC converter Reactive-power control system configuration constant power factor, permanent reactive power and constant voltage control model nothings
Function adjusts control model, and under invariable power factor controlling mode, inverter output power factor is constant, defeated by adjusting inverter
Reactive power out maintains the power factor (PF) of grid entry point constant；Under permanent Reactive Power Control mode, inverter exports idle function
Rate is constant, and the reactive power for directly controlling inverter output maintains the reactive power of grid entry point constant, settable inverter output
Idle 0~± 100% nominal reactive；Under constant voltage mode control, reactive voltage curve is preset, passes through central control equipment reality
When detect grid entry point voltage, when voltage ripple of power network, dynamic regulation inverter output reactive power size, to maintain grid entry point
Voltage is constant.Different control models, can effectively play the dynamic power regulation performance of photovoltaic DC-to-AC converter, and maintenance system is normally transported
Node voltage within the allowable range, or provides enough reactive power supports after electric power system fault and collapses to prevent locking system voltage when row
It bursts.
Reach the 48% of rated capacity, when rated active power is run the present invention relates to the maximum idle output of inverter, power because
Element meets the requirement of idle configuration up to 30% rated capacity, while reaching to idle output Zi idle control instruction is received up to 0.9
90% target value, actual measurement dynamic response time are 27.73ms, meet the requirement of national standard 30ms dynamic reactive response.
Photovoltaic DC-to-AC converter is using maximal power tracing MPPT and the mutually coordinated control model of dynamic passive compensation SVG, effectively
Using the active redundancy capacity of photovoltaic DC power and inverter, the photovoltaic DC-to-AC converter control strategy containing idle control is realized.
Adapter in photovoltaic inversion device assembly externally exports the alternating current that 12V DC voltage is changed into high-frequency and high-voltage, adopts
With pulsewidth modulation (PWM) technology, core is a PWM integrated manipulator.Adapter uses UC3842, the integrated control of PWM
Device processed uses TL5001 chip, and the operating voltage range 3.6-40V of TL5001 is internally provided with an error amplifier, and one
Adjuster, oscillator, the PWM generator for having dead zone function, low-voltage variation circuit and short-circuit protection circuit etc..
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.
Claims (9)
1. a kind of intelligent photovoltaic inverter power regulating system, which is characterized in that including photovoltaic inversion device assembly, photovoltaic DC-to-AC converter
Monitoring system and photovoltaic DC-to-AC converter Reactive-power control system；
The photovoltaic inversion device assembly is used to direct current power be converted to AC power, and configures power and quickly adjust on the spot and remote
Process control function；
The photovoltaic DC-to-AC converter monitoring system, for carrying out real-time monitoring and power closed-loop control to photovoltaic DC-to-AC converter operating condition；Institute
It states photovoltaic DC-to-AC converter monitoring system to be made of central control equipment and sub-control control equipment, different points of the central control equipment convergence
The metric data for controlling equipment, generates and issues power control instruction, voltage, electricity of the sub-control control equipment to photovoltaic DC-to-AC converter
Galvanic electricity tolerance carries out real-time monitoring, calculate realtime power value and on send to central control equipment, while receiving and implementation center's control
The power control instruction of control equipment；
The photovoltaic DC-to-AC converter Reactive-power control system is used in grid entry point voltage out-of-limit, carries out Reactive-power control to network voltage.
2. a kind of intelligent photovoltaic inverter power regulating system according to claim 1, which is characterized in that the photovoltaic is inverse
Become device assembly to be made of boosting circuit and inversion bridge type return；The boosting circuit is the dc voltage boost of photovoltaic array to inverse
DC voltage after boosting is then converted to mains frequency by DC voltage needed for becoming device output control, the inversion bridge type return
Alternating voltage.
3. a kind of intelligent photovoltaic inverter power regulating system according to claim 2, which is characterized in that the photovoltaic is inverse
Become device assembly and is based on non-inverting output alternating voltage.
4. a kind of intelligent photovoltaic inverter power regulating system according to claim 3, which is characterized in that the photovoltaic is inverse
The adapter become in device assembly realizes pulsewidth modulation using PWM integrated manipulator；The PWM integrated manipulator uses TL5001 core
Piece.
5. a kind of intelligent photovoltaic inverter power regulating system according to claim 1, which is characterized in that the photovoltaic is inverse
Become device Reactive-power control system and Reactive-power control is carried out to network voltage, comprising: by photovoltaic DC-to-AC converter rated capacity and active volumeter
MPPT redundancy capacity is calculated, idle control reference current is calculated according to the instruction value issued, it is real by current control loop driving IGBT
Existing switch controlled, realizes photovoltaic DC-to-AC converter Reactive-power control.
6. a kind of intelligent photovoltaic inverter power regulating system according to claim 1, which is characterized in that the photovoltaic is inverse
Become device Reactive-power control system configuration constant power factor, permanent reactive power and constant voltage and controls three kinds of Reactive-power control control models.
7. a kind of intelligent photovoltaic inverter power regulating system according to claim 6, which is characterized in that the invariable power
Under factor controlling mode, inverter output power factor is constant, and the reactive power by adjusting inverter output maintains grid entry point
Power factor (PF) it is constant；Under the perseverance Reactive Power Control mode, inverter output reactive power is constant, directly controls inverter
The reactive power of output maintains the reactive power of grid entry point constant；Under the constant voltage mode control, reactive voltage curve is preset,
By central control equipment real-time detection grid entry point voltage, when voltage ripple of power network, dynamic regulation inverter exports idle function
Rate size, to maintain grid entry point voltage constant.
8. a kind of intelligent photovoltaic inverter power regulating system according to claim 7, which is characterized in that the perseverance is idle
Under power control mode, the output reactive power that inverter is arranged is 0~± 100% rated reactive power.
9. a kind of intelligent photovoltaic inverter power regulating system according to claim 1, which is characterized in that the center control
It is communicated between control equipment and sub-control control equipment by cable, optical fiber or wireless various ways.
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| CN201910536141.8A CN110311428A (en) | 2019-06-20 | 2019-06-20 | A kind of intelligent photovoltaic inverter power regulating system |
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| CN201910536141.8A CN110311428A (en) | 2019-06-20 | 2019-06-20 | A kind of intelligent photovoltaic inverter power regulating system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280835A (en) * | 2013-05-16 | 2013-09-04 | 南京南瑞太阳能科技有限公司 | Method for controlling power generation state of three-phase grid-connected photovoltaic inverter |
| CN107658886A (en) * | 2016-12-13 | 2018-02-02 | 中国电力科学研究院有限公司 | Photovoltaic plant reactive voltage control system and method based on inverter hybrid response |
| CN109327050A (en) * | 2018-10-16 | 2019-02-12 | 东北大学 | A kind of stabilization network voltage control method that distributed photovoltaic is grid-connected and system terminal |
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2019
- 2019-06-20 CN CN201910536141.8A patent/CN110311428A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280835A (en) * | 2013-05-16 | 2013-09-04 | 南京南瑞太阳能科技有限公司 | Method for controlling power generation state of three-phase grid-connected photovoltaic inverter |
| CN107658886A (en) * | 2016-12-13 | 2018-02-02 | 中国电力科学研究院有限公司 | Photovoltaic plant reactive voltage control system and method based on inverter hybrid response |
| CN109327050A (en) * | 2018-10-16 | 2019-02-12 | 东北大学 | A kind of stabilization network voltage control method that distributed photovoltaic is grid-connected and system terminal |
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