CN110504687A - Power quality harnessed synthetically system and method - Google Patents
Power quality harnessed synthetically system and method Download PDFInfo
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- CN110504687A CN110504687A CN201910760028.8A CN201910760028A CN110504687A CN 110504687 A CN110504687 A CN 110504687A CN 201910760028 A CN201910760028 A CN 201910760028A CN 110504687 A CN110504687 A CN 110504687A
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
-
- 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
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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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 power quality harnessed synthetically system and methods, and the system comprises the first static switch, the second static switch, two-way AC/DC convertor, two-way DC converter, energy-accumulating medium, current detecting unit, the ac input end for connecting power grid and the ac output ends for connecting load；The two-way AC/DC convertor includes that harmonic compensation control unit, the control of reactive power compensating unit, voltage dip compensation control unit, short time voltage interrupt compensation control unit and energy storage control unit, is respectively used to carry out power quality harmonic compensation, the management such as reactive compensation, voltage dip compensation, short time voltage interrupt compensation and peak load shifting utilizes.Power quality harnessed synthetically system and method for the invention can provide low harmony wave, high-quality continual quality power for load, require power supply quality stringent industry, and especially advanced manufacturing has significant economic benefit.
Description
Technical field
The present invention relates to electric energy process fields, more specifically to a kind of power quality harnessed synthetically system and method.
Background technique
Modern advanced manufacturing industry factory automation degree and continuous production are higher and higher, on automatic production line extensively
The programmable controller of use, servo-drive, robot, controls the electromechanical equipments such as chain and communication device to electric energy at frequency converter
The requirement of quality is also higher, the voltage decline abruptly of a few tens of milliseconds duration, for semiconductor, automobile, polysilicon, pharmacy,
Petroleum, chemical industry, metallurgical equicontinuity production industry and enterprise, will lead to heavy losses.
In the semiconductor chip industry of advanced manufacturing industry, for manufacture the various high-precision automation equipments of chip for
The quality of power supply is very sensitive, the voltage dip of several cycles all will affect these equipment normal work and product it is good
Rate, the serious product batch that will cause are scrapped, and huge economic losses are caused.Therefore using semiconductors manufacture as the advanced manufacture of representative
Industry proposes new challenge to traditional power supply, it is desirable that electric system persistently provides low harmony wave, and high-quality is continual excellent
Matter electric power.
Existing power quality controlling control system is mainly Voltage Series compensator (AVR), Active Power Filter-APF
(APF), Static Var Compensator (SVG), the power quality controllings functions of the equipments such as energy storage AC/DC converter are single, can only disperse
Formula carry out power quality controlling, cannot concentrate the large-scale advanced manufacturing industry factory of comprehensive treatment consecutive production voltage dip,
The problem of harmonic wave, three-phase imbalance, reactive compensation and power grid " peak load shifting " energy storage.
Summary of the invention
The technical problem to be solved in the present invention is that providing a kind of power quality harnessed synthetically system for above-mentioned problem
System and method.
A kind of power quality harnessed synthetically system, including the first static switch, the second static switch, two-way ac-dc conversion
Device, two-way DC converter, energy-accumulating medium, current detecting unit, the ac input end for connecting power grid and for connecting
The ac output end of load, and the both ends of first static switch are separately connected the ac input end and ac output end,
Second static switch, two-way AC/DC convertor, two-way DC converter are sequentially connected in series in the ac output end and storage
Between energy medium, the current detecting unit is connected to the ac output end；The two-way AC/DC convertor includes harmonic wave
Control unit is compensated, the harmonic compensation control unit is for making the system work with harmonic compensation mode, and the harmonic wave
Compensation control unit includes Harmonics Calculation subelement, harmonic injection subelement and the first charging subelement, in which:
The Harmonics Calculation subelement, the load current for being measured according to the current detecting unit calculate the load
Harmonic current components in electric current；
The harmonic injection subelement, for being held on first static switch and the second static switch, and it is raw
Power grid is injected at the compensation electric current equal in magnitude, contrary with the harmonic current components；
The first charging subelement, it is described for being energy-accumulating medium charging according to the state of the energy-accumulating medium
Two-way AC-DC converter is worked when the energy-accumulating medium charges with rectification mode.
In the invention power quality harnessed synthetically system, the two-way AC/DC convertor includes reactive compensation control
Unit processed, the control of reactive power compensating unit is for making the system work with reactive compensation mode, and the reactive compensation control
Unit processed includes reactive power computation subunit, reactive power injection subelement and the second charging subelement, in which:
The reactive power computation subunit, the load current for being measured according to the current detecting unit calculate load
The reactive power of side；
The reactive power injects subelement, for being held on first static switch and the second static switch,
And reactive power injection power grid needed for making the two-way AC/DC convertor generate load-side；
The second charging subelement, it is described for being energy-accumulating medium charging according to the state of the energy-accumulating medium
Two-way AC-DC converter is worked when the energy-accumulating medium charges with rectification mode.
In the invention power quality harnessed synthetically system, the system comprises grid voltage detection units, described
Two-way AC/DC convertor includes voltage dip control unit, and the voltage dip control unit is for making the system with voltage
Temporarily drop compensation model work, and the voltage dip control unit includes that the first compensation electric current injects subelement；
The first compensation electric current injects subelement, for measuring network voltage in short-term in the grid voltage detection unit
When either shallow temporarily drops, it is held on first static switch and the second static switch, and will be obtained from the energy-accumulating medium
Direct current is output to the two-way AC/DC convertor via the two-way DC converter, by the two-way AC/DC convertor
DC inverter is exchanged into electrical pumping power grid with phase with frequency with network voltage with current source mode.
In the invention power quality harnessed synthetically system, the two-way AC/DC convertor includes voltage interruption control
Unit processed, the voltage interruption control unit is for making the system interrupt compensation model work, and the electricity with short time voltage
It includes that the second compensation electric current injects subelement that pressure, which interrupts control unit,；
The second compensation electric current injects subelement, for measuring network voltage in short-term in the grid voltage detection unit
When interruption or depth temporarily drop, the first static switch disconnection, the second static switch is made to be held on, and will be situated between from the energy storage
The direct current that matter obtains is output to the two-way AC/DC convertor via the two-way DC converter, straight by the two-way friendship
Current converter invertes direct current to alternating current injection power grid with voltage source mode.
In the invention power quality harnessed synthetically system, the two-way AC/DC convertor includes that energy storage control is single
Member, the energy storage control unit are used to be made the system with the work of energy storage mode, the energy storage control unit according to control instruction
Including Charge Management subelement and electric discharge management subelement；
The Charge Management subelement is used for when power grid be in paddy when rate period, make described first charge subelement and
The second charging subelement is respectively that the energy-accumulating medium charges according to the state of the energy-accumulating medium, and the two-way friendship directly becomes
Parallel operation is worked when the energy-accumulating medium charges with rectification mode；
The electric discharge management subelement is for when rate period, passing through the two-way DC converter when power grid is in peak
The direct current obtained from the energy-accumulating medium is output to the two-way AC/DC convertor after voltage transformation, and is made described double
The alternating current feed-in power grid with power grid with frequency with phase is generated to AC/DC convertor, the two-way AC-DC converter is in the energy storage
It is worked when medium discharge with inverter mode.
The present invention also provides a kind of power quality harnessed synthetically methods, comprising the following steps:
S1, real-time detection load current, and the harmonic current in the load current is calculated according to the load current measured
Component；
S2, the compensation electric current injection power grid equal in magnitude, contrary with the harmonic current components is generated；
S3, according to the state of the energy-accumulating medium, the alternating current that power grid exports is converted into direct current and to energy-accumulating medium
Charging.
In the invention power quality harnessed synthetically method, the step S1 includes: real-time detection load current, and
The reactive power of load-side is calculated according to the load current measured；
The step S2 includes: reactive power injection power grid needed for generating load-side.
In the invention power quality harnessed synthetically method, the step S1 includes: real-time detection network voltage, and
It is temporarily dropped according to the cycle of the network voltage capture network voltage measured；
The step S2 include: network voltage occur either shallow temporarily drops in short-term when, it is straight by being obtained from the energy-accumulating medium
Galvanic electricity inversion is to exchange electrical pumping power grid with phase with frequency with network voltage, is simultaneously load supplying by power grid and energy-accumulating medium.
In the invention power quality harnessed synthetically method, the step S2 further include: occur in network voltage short
When interrupt or depth is when temporarily dropping, disconnect the connection of power grid and load, be friendship by the DC inverter obtained from the energy-accumulating medium
Galvanic electricity injects power grid, stands alone as load supplying by energy-accumulating medium.
In the invention power quality harnessed synthetically method, the method also includes following steps:
S4, when power grid is in paddy when rate period, be that the energy-accumulating medium charges according to the state of the energy-accumulating medium；
S5, when rate period, the direct current obtained from the energy-accumulating medium is electrically generated same with power grid when power grid is in peak
Alternating current feed-in power grid of the frequency with phase.
Power quality harnessed synthetically system and method for the invention, by using the first static switch, the second static switch,
Two-way AC/DC convertor, two-way DC converter, energy-accumulating medium etc. form hardware system, and on the basis of this hardware system
Integrated harmonic compensation mode, reactive compensation mode, voltage dip compensation model, short time voltage interrupt compensation model and energy storage mould
Formula dispatch control system, while realizing the harmonic compensation of power grid, reactive compensation, voltage dip compensation, short time voltage interruption compensation
It the functions such as utilizes with peak load shifting, can provide low harmony wave, high-quality continual quality power for load.Implementation pair of the invention
Power supply quality requires stringent industry, and especially advanced manufacturing has significant economic benefit.
Detailed description of the invention
Fig. 1 is the functional block diagram of power quality harnessed synthetically system embodiment of the present invention；
Fig. 2 is the flow diagram of power quality harnessed synthetically control method embodiment of the present invention.
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.
As shown in Figure 1, being the functional block diagram of power quality harnessed synthetically system embodiment of the present invention, the electric energy matter
Amount comprehensive treatment system can be applied to semiconductor, automobile, polysilicon, pharmacy, petroleum, chemical industry, metallurgical equicontinuity production industry
With uninterruptible power system, the emergency power supply of enterprise etc., and realize simultaneously above-mentioned power supply system or equipment power quality it is humorous
Wave compensation, reactive compensation, voltage dip compensation, short time voltage interruption compensates and the management such as peak load shifting utilizes.The power quality
Comprehensive treatment system includes that connect the ac input end 11 of power grid, the first static switch 12, the second static switch 13, two-way friendship straight
The ac output end 17 and current detecting list that current converter 14, two-way DC converter 15, energy-accumulating medium 16, connection load
Member 18 and grid voltage detection unit 19.The both ends of first static switch 12 are separately connected the ac input end 11 and hand over
Output end 17 is flowed, second static switch 13, two-way AC/DC convertor 14, two-way DC converter 15 are sequentially connected in series in institute
It states between ac output end 17 and energy-accumulating medium 16, the current detecting unit 18 is serially connected in first static switch 12 and institute
It states between ac output end 17, the grid voltage detection unit 19 is serially connected in the ac input end 11 and first static state
Between switch 12.Wherein, the two-way AC/DC convertor 14 includes harmonic compensation control unit 20, the control of reactive power compensating unit
21, voltage dip compensation control unit 22, short time voltage interrupt compensation control unit 23 and energy storage control unit 24.In addition,
The system further include for the maintenance of system off-network by-pass switch and for realizing electrical isolation between power grid and system every
From transformer.Above-mentioned two-way AC/DC convertor 14 has the ability of four quadrant running, and two-way DC converter 15 has energy
The ability for measuring two-way flow, the controllable output of active power and reactive power, therefore, the system may be implemented by above system
Solution harmonic compensation, reactive compensation, voltage dip compensation, short time voltage interruption compensation and peak clipping can be integrated in set of device to fill out
Paddy such as utilizes at the electric energy governing problem.
In above-mentioned power quality harnessed synthetically system, the harmonic compensation control unit 20 is for making the system with humorous
Wave compensation model work, and the harmonic compensation control unit 20 include Harmonics Calculation subelement, harmonic injection subelement and
First charging subelement, in which: the Harmonics Calculation subelement, the load electricity for being measured according to the current detecting unit 18
Harmonic current components in load current described in stream calculation；The harmonic injection subelement, for making first static switch
12 and second static switch 13 be held on, and generate and the harmonic current components are equal in magnitude, contrary compensation electricity
Stream injection power grid；The first charging subelement, for being that the energy-accumulating medium 16 fills according to the state of the energy-accumulating medium 16
Electricity, the two-way AC-DC converter 14 are worked when the energy-accumulating medium 16 charges with rectification mode.Specifically, in harmonic compensation
Under mode, the first static switch 12 and the conducting of the second static switch 13 are kept, it is humorous after current detecting unit 18 measures load current
Wave computation subunit calculates the harmonic component of load current, and harmonic injection subelement passes through in transformation output and load current
Harmonic current components contrary compensation electric current equal in magnitude simultaneously injects power grid, realizes the harmonic compensation function of power grid.This
Outside, when energy-accumulating medium 16 is in full power state, two-way DC converter 15 does not work；When energy-accumulating medium 16 is in power shortage state
When, the first charging subelement turns alternating voltage to 15 output AC voltage of two-way DC converter, two-way DC converter 15
DC voltage is changed to as the charging of energy-accumulating medium 16, two-way AC-DC converter 14 is when the energy-accumulating medium 16 charges with rectification mode
Work.Harmonic compensation mode not only realizes the harmonic compensation function of power grid, fills needed for also obtaining energy-accumulating medium from power grid
Electrical power charges to energy-accumulating medium, while realizing the Charge Management of energy-accumulating medium.
In above-mentioned power quality harnessed synthetically system, the control of reactive power compensating unit 21 is for making the system with idle benefit
Mode work is repaid, and the control of reactive power compensating unit 21 includes reactive power computation subunit, reactive power injection subelement
And second charging subelement, in which: the reactive power computation subunit, for being measured according to the current detecting unit 18
Load current calculate load-side reactive power；The reactive power injects subelement, for making first static switch
12 and second static switch 13 be held on, and reactive power needed for making the two-way AC/DC convertor 14 generate load-side
Inject power grid；The second charging subelement, for being the energy-accumulating medium 16 charging according to the state of the energy-accumulating medium 16,
The two-way AC/DC convertor 14 is worked when the energy-accumulating medium charges with rectification mode.Reactive compensation mode is not only realized
The no-power compensation function of power grid, while also achieving the Charge Management of energy-accumulating medium.
In above-mentioned power quality harnessed synthetically system, voltage dip control unit 22 is for keeping the system temporary with voltage
Compensation model work is dropped, and the voltage dip control unit 22 includes that the first compensation electric current injects subelement；Described first mends
Electric current injection subelement is repaid, for making institute when the grid voltage detection unit 19 measures network voltage either shallow temporarily drops in short-term
It states the first static switch 12 and the second static switch 13 is held on, and by the electric energy obtained from the energy-accumulating medium 16 by double
It is output to the two-way AC/DC convertor 14 to DC converter 15, by the two-way AC/DC convertor 14 with current source mould
DC inverter is to exchange electrical pumping power grid with phase with frequency with network voltage by formula, provides instantaneous energy, support electricity for power grid
Net, while restoring the voltage dip of power grid.Specifically, when either shallow voltage dip in short-term occurs in power grid, first is static at this time
Switch 12 and the second static switch 13 are held on, and load is mainly powered by power grid, but is impacted in order to compensate for due to backend load
Either shallow temporarily drops bring network voltage in short-term, and system will intervene in short-term at this time, and the first compensation electric current injection subelement 19 is power grid
Inject the alternating current with network voltage with frequency with phase, it is ensured that temporarily drop phenomenon is inhibited, and supports Network Voltage Stability in normal value
In range.
In above-mentioned power quality harnessed synthetically system, voltage interruption control unit 23 is for keeping the system short with voltage
When interrupt compensation model work, and the voltage interruption control unit 23 include second compensation electric current inject subelement；Described
Two compensation electric currents inject subelements, for measuring network voltage short interruptions in the grid voltage detection unit 19 or depth is temporary
When drop, the disconnection of the first static switch 12, the second static switch 13 is made to be held on, and will obtain from the energy-accumulating medium 16
Electric energy be output to the two-way AC/DC convertor 14 by the two-way DC converter 15, become by the two-way alternating current-direct current
Parallel operation 14 invertes direct current to alternating current injection power grid with voltage source mode, interrupts compensation model work in system with short time voltage
Under work, power grid and load separate, and are that local load is independently-powered by system.Specifically, when voltage interruption in short-term occurs in power grid
Or when depth voltage dip, the first static switch 12 is disconnected, the second static switch 13 is held on, and is loaded only by system in short-term
Vertical power supply.At this point, direct current energy is conveyed to two-way AC/DC convertor 14 by two-way DC converter 15 by energy-accumulating medium 16,
DC inverter is needed for power grid with the work of off-network inverter mode, two-way AC/DC convertor 14 by two-way AC/DC convertor 14
Stable alternating current, it is ensured that uninterrupted power supply.
In above-mentioned power quality harnessed synthetically system, energy storage control unit 24 is used to make the system according to control instruction
With the work of energy storage mode, the energy storage control unit 24 includes Charge Management subelement and electric discharge management subelement；The charging
Subelement is managed to be used to when rate period, keep the first charging subelement and the second charging single when power grid is in paddy
Member is respectively that the energy-accumulating medium 16 charges according to the state of the energy-accumulating medium 16, and the two-way AC-DC converter 14 is described
Energy-accumulating medium 16 is worked when charging with rectification mode；The electric discharge management subelement is used for the rate period when power grid is in peak
When, the electric energy obtained from the energy-accumulating medium 16 is output to described pair after voltage transformation by the two-way DC converter
To AC/DC convertor 14, and the two-way AC/DC convertor 14 is made to generate the alternating current feed-in electricity with power grid with frequency with phase
Net, the two-way AC-DC converter 14 are worked when the energy-accumulating medium 16 discharges with inverter mode.Specifically, system according to
Family instruction or the instruction of power grid United Dispatching enter energy storage mode.When power grid is in paddy when rate period, Charge Management is single
Member controls two-way AC/DC convertor 14 and power grid AC energy is converted to direct current energy, by two-way DC converter 15 be with
The active power obtained from power grid is energy-accumulating medium charging, realizes grid power by the matched DC voltage of energy-accumulating medium
" valley-fill " function；When power grid is in peak when rate period, electric discharge management subelement leads to energy-accumulating medium 16 by direct current energy
It crosses two-way DC converter 15 and is delivered to two-way AC/DC convertor 14, two-way AC/DC convertor 14 is with parallel network reverse mode work
Make, is to exchange electrical pumping power grid with phase with frequency with power grid by DC inverter, injects certain active power for power grid, realize
" peak clipping " function of grid power.
As shown in Fig. 2, the present invention also provides a kind of power quality harnessed synthetically control methods.This method can be applied to partly lead
Body, automobile, polysilicon, pharmacy, petroleum, chemical industry, metallurgical equicontinuity production industry and the uninterruptible power system of enterprise are met an urgent need
Power supply etc., and above system includes that connect the ac input end of power grid, the first static switch, the second static switch, two-way friendship straight
Current converter, two-way DC converter, energy-accumulating medium, the ac output end of connection load and current detecting unit and power grid
Voltage detection unit, and the both ends of above-mentioned first static switch are separately connected the ac input end and ac output end, the
Two static switches, two-way AC/DC convertor, two-way DC converter are sequentially connected in series between ac output end and energy-accumulating medium,
Current detecting unit is serially connected between first static switch and ac output end, and grid voltage detection unit is serially connected in described
Between ac input end and the first static switch.This method can realize harmonic compensation function, no-power compensation function, in short time voltage
Disconnected compensation function and energy-storage function.Specifically includes the following steps:
Include: in the harmonic compensation function of the invention power quality harnessed synthetically method
Step S1, real-time detection load current, and the harmonic wave in the load current is calculated according to the load current measured
Current component.
In the harmonic compensation function of the invention power quality harnessed synthetically method, include: after the step S1
Step S11, it generates the compensation electric current equal in magnitude, contrary with the harmonic current components and injects power grid.In
Step S1, in S11 step, the electric current of load-side is detected by current detecting unit, obtains load current, and accordingly described in calculating
Harmonic current components in load current, AC/DC converter are big with the harmonic current components in load current by transformation output
Small equal, contrary compensation electric current, and power grid is injected, realize the harmonic compensation function of power grid.
In the no-power compensation function of the invention power quality harnessed synthetically method, including step S2:
Step S2, real-time detection load current calculates the reactive power of load-side according to the load current measured.
In the no-power compensation function of the invention power quality harnessed synthetically method, include: after the step S2
Step S21, reactive power needed for generating load-side injects power grid.
In this step, by the reactive power of real-time detection and analysis load-side, and son list is injected by reactive power
The injection power grid of reactive power needed for member makes two-way AC/DC convertor generate load-side, realizes the no-power compensation function of power grid.
It should be noted that power quality harnessed synthetically method can be performed simultaneously the harmonic compensation function and idle benefit of power grid
Repay function.
It is interrupted in compensation function in the short time voltage of the invention power quality harnessed synthetically method, including step S3:
Step S3, real-time detection network voltage, and the cycle of the network voltage capture network voltage obtained according to real-time monitoring
Temporarily drop.
Interrupted in compensation function in the short time voltage of the invention power quality harnessed synthetically method, the step S3 it
After include:
Step S31, when network voltage occurs that either shallow temporarily drops in short-term, the DC inverter that will be obtained from the energy-accumulating medium
It is simultaneously load supplying by power grid and energy-accumulating medium to exchange electrical pumping power grid with phase with frequency with network voltage.
By grid voltage detection unit real-time detection network voltage, and the cycle for capturing network voltage accordingly temporarily drops, and sentences
Whether disconnected network voltage is normal.When voltage is abnormal, it need to further judge whether voltage is that short interruptions or depth temporarily drop, or
Either shallow temporarily drops in short-term.Network voltage occurs when either shallow temporarily drops in short-term, is and power grid by the DC inverter obtained from energy-accumulating medium
Voltage, with the exchange electrical pumping power grid of phase, is load supplying by power grid and energy-accumulating medium with frequency.Pass through grid voltage detection unit
Measure result statistical analysis network voltage the case where, network voltage be in either shallow temporarily drops abnormal conditions in short-term when, load by
Power grid and power quality integrated control system are powered jointly, and energy-accumulating medium is generated by two-way AC/DC convertor and network voltage
With frequency with the exchange electrical pumping power grid of phase, make Network Voltage Stability in the normal range, in network voltage short interruptions or depth
Temporarily when drop, the connection of power grid and load is disconnected, is exchange electrical pumping power grid by the DC inverter obtained from the energy-accumulating medium,
Load supplying is stood alone as by power quality integrated control system.Short interruptions or depth, which are in, in network voltage temporarily drops abnormal feelings
When condition, load is independently-powered by power quality integrated control system, and energy-accumulating medium generates exchange by two-way AC/DC convertor
Electrical pumping power grid.By above step, realize that the short time voltage of power grid interrupts compensation function.
In the energy-storage function of the invention power quality harnessed synthetically method, including step S4:
Step S4, real-time detection network voltage, and the cycle of the network voltage capture network voltage obtained according to real-time monitoring
Temporarily drop.
In the energy-storage function of the invention power quality harnessed synthetically method, include: after the step S4
Step S41, according to the state of the energy-accumulating medium, the alternating current that power grid exports is converted into direct current and to energy storage
Medium charging.
That is, being storage by the charge power needed for obtaining energy-accumulating medium in power grid when energy-accumulating medium is power shortage state
Energy medium charging, realizes energy-storage function.
It should be noted that the power quality harnessed synthetically method, which executes short time voltage, interrupts compensation function (step S3, step
Rapid S31) when, harmonic compensation function (step S1, step S11), no-power compensation function (step S2, step S21) and energy storage function
Energy (step S4, step S41) cannot be run；The power quality harnessed synthetically method executes energy-storage function (step S4, step
When S41), harmonic compensation function (step S1, step S11), no-power compensation function (step S2, step S21) and short time voltage
Interrupting compensation function (step S3, step S31) cannot run.
In the invention power quality harnessed synthetically method, further includes: when power grid is in paddy when rate period, root
According to the state of the energy-accumulating medium, it is energy-accumulating medium charging by the active power obtained from power grid, realizes grid power
" valley-fill " function；It is with power grid with frequency by the DC inverter obtained from energy-storage units when power grid is in peak when rate period
With the alternating current feed-in power grid of phase, certain active power is injected for power grid, realizes " peak clipping " function of grid power.
Power quality harnessed synthetically system and method for the invention, by using the first static switch, the second static switch,
Two-way AC/DC convertor, two-way DC converter, energy-accumulating medium etc. form hardware system, and on the basis of this hardware system
Integrated harmonic compensation mode, reactive compensation mode, voltage dip compensation model, short time voltage interrupt compensation model and energy storage mould
Formula dispatch control system, to realize that the harmonic compensation of power grid, reactive compensation, voltage dip compensation, short time voltage are interrupted and mended simultaneously
It repays and the functions such as utilizes with peak load shifting, can provide low harmony wave, high-quality continual quality power for load.Implementation of the invention
Stringent industry is required power supply quality, and especially advanced manufacturing has significant economic benefit.
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 (10)
1. a kind of power quality harnessed synthetically system, which is characterized in that including the first static switch, the second static switch, two-way
AC/DC convertor, two-way DC converter, energy-accumulating medium, current detecting unit, for connect the ac input end of power grid with
And the ac output end for connecting load, and the both ends of first static switch are separately connected the ac input end and friendship
Output end is flowed, second static switch, two-way AC/DC convertor, two-way DC converter are sequentially connected in series defeated in the exchange
Between outlet and energy-accumulating medium, the current detecting unit is connected to the ac output end；The two-way AC/DC convertor
Including harmonic compensation control unit, the harmonic compensation control unit is used to make the system with the work of harmonic compensation mode, and
The harmonic compensation control unit includes Harmonics Calculation subelement, harmonic injection subelement and the first charging subelement, in which:
The Harmonics Calculation subelement, the load current for being measured according to the current detecting unit calculate the load current
In harmonic current components；
The harmonic injection subelement for being held on first static switch and the second static switch, and makes described
Two-way AC/DC convertor generates the compensation electric current equal in magnitude, contrary with the harmonic current components and injects power grid；
The first charging subelement, it is described two-way for being energy-accumulating medium charging according to the state of the energy-accumulating medium
AC-DC converter is worked when the energy-accumulating medium charges with rectification mode.
2. power quality harnessed synthetically system according to claim 1, which is characterized in that the two-way AC/DC convertor
Including the control of reactive power compensating unit, the control of reactive power compensating unit is used to make the system with the work of reactive compensation mode, and
The control of reactive power compensating unit includes that reactive power computation subunit, reactive power injection subelement and the second charging are single
Member, in which:
The reactive power computation subunit, the load current for being measured according to the current detecting unit calculate load-side
Reactive power；
The reactive power injects subelement, for being held on first static switch and the second static switch, and makes
Reactive power needed for the two-way AC/DC convertor generates load-side injects power grid；
The second charging subelement, it is described two-way for being energy-accumulating medium charging according to the state of the energy-accumulating medium
AC-DC converter is worked when the energy-accumulating medium charges with rectification mode.
3. power quality harnessed synthetically system according to claim 2, which is characterized in that the system comprises network voltages
Detection unit, the two-way AC/DC convertor include voltage dip control unit, and the voltage dip control unit is for making
The system is with the work of voltage dip compensation model, and the voltage dip control unit includes that the first compensation electric current injection is single
Member；
The first compensation electric current injects subelement, for measuring network voltage either shallow in short-term in the grid voltage detection unit
Temporarily when drop, the direct current that is held on first static switch and the second static switch, and will be obtained from the energy-accumulating medium
Electricity is output to the two-way AC/DC convertor via the two-way DC converter, by the two-way AC/DC convertor with electricity
DC inverter is to exchange electrical pumping power grid with phase with frequency with network voltage by stream source module.
4. power quality harnessed synthetically system according to claim 3, which is characterized in that the two-way AC/DC convertor
Including voltage interruption control unit, the voltage interruption control unit is for making the system interrupt compensation model with short time voltage
Work, and the voltage interruption control unit includes that the second compensation electric current injects subelement；
The second compensation electric current injects subelement, for measuring network voltage short interruptions in the grid voltage detection unit
Or depth is when temporarily dropping, and makes that first static switch disconnects, the second static switch is held on, and will obtain from the energy-accumulating medium
The direct current taken is output to the two-way AC/DC convertor via the two-way DC converter, is become by the two-way alternating current-direct current
Parallel operation invertes direct current to alternating current injection power grid with voltage source mode.
5. power quality harnessed synthetically system according to claim 4, which is characterized in that the two-way AC/DC convertor
Including energy storage control unit, the energy storage control unit is used to be made the system with the work of energy storage mode, institute according to control instruction
Stating energy storage control unit includes Charge Management subelement and electric discharge management subelement；
The Charge Management subelement is used for when power grid be in paddy when rate period, makes described first to charge subelement and described
Second charging subelement is respectively that the energy-accumulating medium charges according to the state of the energy-accumulating medium, the two-way AC-DC converter
It is worked in energy-accumulating medium charging with rectification mode；
Electric discharge management subelement is used for when power grid is in peak when rate period, will be from by the two-way DC converter
The direct current that the energy-accumulating medium obtains is output to the two-way AC/DC convertor after voltage transformation, and makes the two-way friendship
DC converter generates the alternating current feed-in power grid with power grid with frequency with phase, and the two-way AC-DC converter is in the energy-accumulating medium
It is worked when electric discharge with inverter mode.
6. a kind of power quality harnessed synthetically method, which comprises the following steps:
S1, real-time detection load current, and the harmonic current components in the load current are calculated according to the load current measured；
S2, the compensation electric current injection power grid equal in magnitude, contrary with the harmonic current components is generated；
The alternating current that power grid exports is converted to direct current and charged to energy-accumulating medium by S3, the state according to energy-accumulating medium.
7. power quality harnessed synthetically method according to claim 6, which is characterized in that
The step S1 includes: real-time detection load current, and the reactive power of load-side is calculated according to the load current measured；
The step S2 includes: reactive power injection power grid needed for generating load-side.
8. power quality harnessed synthetically method according to claim 6, which is characterized in that
The step S1 includes: real-time detection network voltage, and temporary according to the cycle of the network voltage capture network voltage measured
Drop；
The step S2 includes: the direct current that will obtain from the energy-accumulating medium when network voltage occurs that either shallow temporarily drops in short-term
Inversion is to exchange electrical pumping power grid with phase with frequency with network voltage, is simultaneously load supplying by power grid and energy-accumulating medium.
9. power quality harnessed synthetically method according to claim 8, which is characterized in that
The step S2 further include: when short interruptions occurs in network voltage or depth temporarily drops, the connection of power grid and load is disconnected,
It is exchange electrical pumping power grid by the DC inverter obtained from the energy-accumulating medium, load supplying is stood alone as by energy-accumulating medium.
10. power quality harnessed synthetically method according to claim 6, which is characterized in that the method also includes following
Step:
S4, when power grid is in paddy when rate period, be that the energy-accumulating medium charges according to the state of the energy-accumulating medium；
S5, when rate period, the direct current obtained from the energy-accumulating medium is electrically generated same with frequency with power grid when power grid is in peak
The alternating current feed-in power grid of phase.
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| CN113300358A (en) * | 2021-05-24 | 2021-08-24 | 湖北省电力装备有限公司 | Active power distribution network electric energy management device and use method thereof |
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| CN117039956A (en) * | 2023-08-10 | 2023-11-10 | 福建雄风电气有限公司 | Electric energy quality comprehensive treatment system based on novel photovoltaic energy storage technology |
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