CN108321815A - A kind of low-voltage network utility power quality control system and method - Google Patents
A kind of low-voltage network utility power quality control system and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 2
- 230000006870 function Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000003071 parasitic effect Effects 0.000 abstract description 2
- 230000009711 regulatory function Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 21
- 230000008901 benefit Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 230000005611 electricity Effects 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H02J13/0017—
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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
- H02J3/18—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
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
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- H02J13/0075—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
-
- 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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a kind of low-voltage network utility power quality control system and methods, including electric energy quality active compensating unit, system controller, Passive Reactive Power Compensation unit, phase-change switch group；Wherein electric energy quality active compensating unit has harmonic wave control, reactive-load compensation and three-phase imbalance regulatory function；Passive Reactive Power Compensation unit realizes reactive-load compensation and a degree of three-phase imbalance abatement functions；Phase-change switch group, which has, avoids the rule normality of the three-phase imbalance of the alternate low-voltage network regularity that short circuit occurs from adjusting；System controller realizes the orderly Effec-tive Function for having electric energy quality active compensating unit, reactive-load compensation parasitic element and phase-change switch group.The present invention can effectively solve the problem that a variety of power quality problems of low-voltage network, realize the target call of system loss minimum as far as possible while ensureing regulation effect.
Description
Technical field
The present invention relates to power electronic technique, and in particular to a kind of low-voltage network utility power quality control system and method.
Background technology
In low-voltage network, especially in Rural Low-Voltage Power Network distribution network system, power load is mostly single-phase load, due to electricity consumption
The factors such as the time difference opposite sex influence, and the objective real-time presence of three-phase imbalance problem, three-phase imbalance problem seriously restricts transformer
Output and quality of voltage problem, the increase for causing low-voltage distributing line to be lost；And with economic development, nonlinear-load is got over
Come more, harmonic wave and idle problem are also more and more prominent；Power electronic technique controls low-voltage network power quality problem
Reason has absolute technical advantage, but the loss of the electric energy quality optimizing governing system based on power electronic technique is big, is optimizing
While low-voltage network power quality problem, cause the increase of low-voltage network system loss rate, this be power distribution network institute not
Allow, there are technological deficiencies.
Application No. is a kind of use electric energy quality active compensating unit of 201710279465.9 Chinese patent proposition and change
Mutually switch solves the problems, such as distribution network electric energy quality, and electric energy quality active compensating unit mainly solves harmonic problem and idle asks
Topic, electric energy quality active compensating unit capacity is relatively large, meets the reactive-load compensation of low-voltage network and the demand of harmonic wave, is
The loss of system will be larger.
Application No. is 201610622366.1 Chinese patents to propose that one kind is adjusted by compensating reactive power and phase-change switch
It realizes low-voltage distributing line end low-voltage problem, administers for inductive reactive power and three-phase imbalance and asked to solve low-voltage
Topic.But as distributed new accesses power distribution network on a large scale, low-voltage network voltage frequent fluctuation is caused, both there is high electricity
There is low-voltage again in pressure problem.So being difficult to successfully manage new energy access using traditional reactive-load compensation and phase-change switch
New Active power distribution network voltage problem.
Invention content
To solve existing low-voltage network power quality controlling system or big or bad regulation effect technical problem being lost,
The present invention provides a kind of low-voltage network utility power quality control system and method.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of low-voltage network utility power quality control system, is characterized in that：
Including electric energy quality active compensating unit, Passive Reactive Power Compensation unit, phase-change switch group, system controller, electric current
Sampling unit, voltage sampling unit and communication unit；
The electric energy quality active compensating unit and Passive Reactive Power Compensation unit are arranged in parallel with load, electric energy therein
Quality active compensation unit is connect by current sampling unit with power grid, the electric current for acquiring power grid；
The phase-change switch group is arranged with load in series；
The system controller is connect by current sampling unit and voltage sampling unit with power grid, for acquiring power grid
Electric current and voltage；
The system controller by communication unit respectively with electric energy quality active compensating unit, Passive Reactive Power Compensation unit
And the connection of phase-change switch group, the operation for controlling each unit.
Further, the voltage sampling unit is threephase potential transformer or voltage differential sample circuit, the electric current
Sampling unit is threephase current transformer.
Further, the communication unit is micro-power wireless communication unit.
Further, the communication unit is power carrier communication unit.
Further, in order to improve the effect of comprehensive treatment, reduce power consumption, the system controller include arithmetic element,
Sequential logic unit and control unit,
The arithmetic element is used to calculate low-voltage distribution according to the electric current of power grid, voltage and each phase-change switch group load data
Tri-phase unbalance factor, power factor and the percent harmonic distortion of net；
The sequential logic unit is for comparing tri-phase unbalance factor, power factor and percent harmonic distortion and preset value
Compared with judging whether tri-phase unbalance factor, power factor and percent harmonic distortion are qualified；
Described control unit is used to control electric energy quality active compensating unit, nothing according to the judging result of sequential logic unit
The operation of source reactive compensation unit and phase-change switch group；And according to the electric current of power grid and each phase-change switch group load data operation
Obtain the switch motion logic of each phase-change switch group.
Meanwhile the present invention also provides one kind based on above-mentioned low-voltage network utility power quality control system progress power quality
The method of control, is characterized in that：
1) electric current and voltage for acquiring power grid, calculate the tri-phase unbalance factor of low-voltage network；
2) judge whether tri-phase unbalance factor is exceeded, if not exceeded execution step 5), if exceeded, execute step 3)；
3) according to system power, then according to each phase-change switch group load data, operation obtains each phase-change switch group switch
Action logic, each phase-change switch group put into operation；
4) electric current and voltage for acquiring power grid again, calculate the tri-phase unbalance factor and power factor of low-voltage network；Sentence
Whether disconnected tri-phase unbalance factor is exceeded, if exceeded execution step 8), if qualified execute step 5)；
5) judge whether system power factor is qualified, if unqualified, Passive Reactive Power Compensation unit puts into operation, if closed
Lattice execute step 7)；
6) electric current, the voltage of power grid, computing system power factor and percent harmonic distortion are acquired again, judge that power factor is
No qualification executes step 8) if unqualified, if qualified execute step 7)；
7) judge whether percent harmonic distortion is exceeded, if qualified, return to step 2)；If unqualified, step 8) is executed；
8) electric energy quality active compensating unit puts into operation.
Compared with prior art, the present invention advantage is：
Low-voltage network comprehensive power quality Optimal Control System provided by the invention and method, the control system and method
Can comprehensively utilize electric energy quality active compensating unit, Passive Reactive Power Compensation unit and and phase-change switch group advantage, it is weak to keep away its
Gesture realizes the target call of system loss minimum while ensureing regulation effect, it is a variety of to solve low-voltage network as far as possible
Power quality problem.
Description of the drawings
Fig. 1 is the structure diagram of low-voltage network utility power quality control system of the embodiment of the present invention；
Fig. 2 is the work-based logic figure of low-voltage network utility power quality control system of the embodiment of the present invention；
Fig. 3 is the circuit structure diagram of electric energy quality active compensating unit of the embodiment of the present invention；
Fig. 4 is the circuit structure diagram of Passive Reactive Power Compensation unit of the embodiment of the present invention；
Fig. 5 is the switch on-off element circuit structure chart of phase-change switch group of the embodiment of the present invention.
Specific implementation mode
It elaborates to the present invention below in conjunction with attached drawing.
As shown in Figure 1, the low-voltage network comprehensive power quality Optimal Control System and method of the present invention, including electric energy matter
Measure active compensation unit, system controller, Passive Reactive Power Compensation unit, phase-change switch group, current sampling unit, voltage sample list
Member and communication unit；Electric energy quality active compensating unit is based on power electronic technique high power density small size portable module,
Have harmonic wave control, reactive-load compensation and three-phase imbalance regulatory function, active function module capacity is 30kVA；System controls
Device is the core cell for coordinating control electric energy optimizing system, realize electric energy quality active compensating unit, reactive-load compensation parasitic element,
The orderly Effec-tive Function of phase-change switch group；Passive Reactive Power Compensation unit by mending capacitor, point benefit capacitor, alternate compensating electric capacity altogether
Device and reactor constitute passive network, realize reactive-load compensation and a degree of three-phase imbalance function；Phase-change switch group
It is constituted using thyristor and relay switch, intelligent phase-change switch has the low-voltage distribution network rule normality for avoiding phase fault from occurring
Three-phase imbalance is adjusted.
The system controller of the present invention is the core controller of whole system, coordinates the coordination control for controlling each functional unit
Running.System controller includes sequential logic unit, arithmetic element and control unit；Sampling unit is acquired by three-phase mutual inductor
System three-phase current and voltage real time data, phase-change switch group is by communicating single upload load data；Arithmetic element is by each data
Amount is calculated, and obtains the associated arguments such as degree of unbalancedness, power factor, each harmonic；Sequential logic unit is used for three-phase not
The degree of balance, power factor and percent harmonic distortion are compared with preset value, judge that tri-phase unbalance factor, power factor and harmonic wave are abnormal
Whether variability is qualified；Communication unit mainly realizes that system controller carries out data with each function system and leads to by micropower mode
News and controlling strategy parameter issue and instruction issues；Control unit is used to be controlled according to the judging result of sequential logic unit
The operation of electric energy quality active compensating unit, Passive Reactive Power Compensation unit and phase-change switch group；And according to the electric current of power grid and often
A phase-change switch group load data operation obtains the switch motion logic of each phase-change switch group, in optimization governing system power quality
Under the premise of problem, the energy-efficient target of system is realized.
As shown in Fig. 2, the method that the Optimal Control System based on the present invention carries out utility power quality control, including following step
Suddenly；
1) electric current and voltage for acquiring power grid, calculate the tri-phase unbalance factor of low-voltage network；
2) judge whether tri-phase unbalance factor is exceeded, if not exceeded execution step 5), if exceeded, execute step 3)；
3) according to power network current, then according to each phase-change switch group load data, operation obtains each phase-change switch group switch
Action logic, each phase-change switch group put into operation；
4) electric current and voltage for acquiring power grid again, calculate the tri-phase unbalance factor and power factor of low-voltage network；Sentence
Whether disconnected tri-phase unbalance factor is exceeded, if exceeded execution step 8), if qualified execute step 5)；
5) judge whether system power factor is qualified, if unqualified, Passive Reactive Power Compensation unit puts into operation, if closed
Lattice execute step 7)；
6) electric current, the voltage of power grid, computing system power factor and percent harmonic distortion are acquired again, judge that power factor is
No qualification executes step 8) if unqualified, if qualified execute step 7)；
7) electric current, the voltage for acquiring power grid, calculate percent harmonic distortion, judge whether percent harmonic distortion is exceeded, if qualified,
Return to step 2)；If unqualified, step 8) is executed；
8) electric energy quality active compensating unit puts into operation.
Electric energy quality active compensating unit, Passive Reactive Power Compensation unit and phase-change switch group itself in the present invention have compared with
For ripe principle, the control of each unit also all comparative maturity.Wherein the compensation policy of phase-change switch group is by system controller system
Fixed, the compensation policy of electric energy quality active compensating unit is by acquiring power network current information, oneself determining the compensation plan of itself
Slightly, the compensation policy of Passive Reactive Power Compensation unit is formulated by system controller or is controlled by electric energy quality active compensating unit.Figure
3-5 gives the dependency structure figure of existing electric energy quality active compensating unit, Passive Reactive Power Compensation unit and phase-change switch group.
As shown in figure 3, electric energy quality active compensating unit, including the transformation of diode clamp three-level three-phase bridge power is single
Member, DC bus midpoint are connect with network system N lines, three-level three-phase bridge power converter unit connect inversion inductor device and
The grid-connected connection low pressure 400V power distribution networks of filter inductor form LCL type filter network, in filter branch and capacitor at grid-connected end
It is in series with damping resistance, can not only effectively filter out switching harmonics, but also avoids that resonance risk occurs with system.The power quality
Active compensation unit can administer a variety of power quality problems such as three-phase imbalance, idle, harmonic wave.Electric energy quality active compensation is single
Member receives to control enable signal by the operation that system controller issues, while uploading operating status and fault-signal.
The one end inductor L1, L2, L3 is connect with power grid, and other end connects inversion inductor device L4, L5, L6；Resistor R1,
R2, R3 are connected in series with capacitor C1, C2, C3 respectively, and inductor L7, L8, L9 and capacitor C7, C8, C9 are separately connected, resistance
The series unit for being connected in series to the capacitor unit and inductor and capacitor is connected in parallel；The other end of capacitor connects N lines, resistance
The other end of device connects the midpoint of two series reactors；Inductor L4, L5, L6 other end and three-level inverter midpoint
Connection；Capacitor group C5x, C6x is the capacitor group that multiple capacitor parallel connections are constituted respectively, and C5x connects with C6x, capacitor group
Other end respectively at inverter positive and negative direct current busbar connect；Each tri-level inversion bridge arm by IGBT single tubes Tv1, Tv2,
Tv3, Tv4 are in series, and diode T1, T2 series connection both ends are connected across respectively in midpoint and the Tv3 and Tv4 of Tv1 and Tv2
Point forms diode clamp bit-type three-level inverter circuit.
As shown in figure 4, Passive Reactive Power Compensation unit include mainly reactor (configurable according to demand), divide benefit capacitor,
Capacitor, alternate compensation capacitor and switching control unit are mended altogether, by dividing benefit capacitor and alternate compensation capacitor can
With compensating reactive power, while it can effectively administer three-phase imbalance.Passive Reactive Power Compensation unit receives the switching control of system controller
Signal processed, while uploading switching state and fault-signal.
System controller is alternate according to system tri-phase unbalance factor and each phase reactive power, active power, preferential switching
Capacitor can dispatch watt current according to input capacitive coupling device capacity, determine capacitive coupling switching strategy；Further according to each phase
Reactive power determines the total benefit capacitor of input and the strategy of capacitive coupling device, and the common divisor of three phase reactive power determines to be mended altogether
The input strategy of capacitor；The input strategy for dividing benefit capacitor is finally determined further according to reactive requirement.
Phase-change switch group inside includes sampling unit, arithmetic element, switch on-off unit, control unit and communication unit,
Collecting unit acquires circuit load current data, local arithmetic element and system controller coordinates by threephase current transformer,
Realize optimal control strategy；Switch on-off unit is in parallel with relay switch by electronic switch, shortens the switch motion time, avoids
There is power outage in stage load afterwards；Local sampled data and system controller system load data are coordinated control by control unit
System, determines that optimal control policy executes instruction, is communicated by micropower between phase-change switch and system controller.
As shown in figure 5, switch on-off unit includes phase-change switch unit (the antiparallel thyristor connected into every circuitry phase
Electronic switch and after electro-mechanical switches parallel connection constitute), per circuitry phase phase-change switch unit one end connect together with after
The three-phase circuit wiring at grade low-voltage load end；A, an only phase is on shape to the phase-change switch unit of B, C three-phase series simultaneously
The phase-change switch of state, remaining two-phase is in off-state.System controller is according to each phase current of A, B, C and each branch line
Each phase current values of load of the phase-change switch group on road determine the switching mode of each phase-change switch group, and each phase-change switch group is only
The load of wherein two-phase can be thrown into other phases, preferential switching distalmost end on-load switch.
Phase-change switch unit turn-on logic is：Thyristor electronic switch is connected first, secondly in parallel after electro-mechanical switches
Conducting, last thyristor electronic switch disconnect；Phase-change switch turns off logic：Thyristor electronic switch is connected first, secondly in parallel
Turned off after electro-mechanical switches, last thyristor electronic switch disconnects；The switching of the above thyristor uses zero crossing switching.
Claims (6)
1. a kind of low-voltage network utility power quality control system, it is characterised in that：
Including electric energy quality active compensating unit, Passive Reactive Power Compensation unit, phase-change switch group, system controller, current sample
Unit, voltage sampling unit and communication unit；
The electric energy quality active compensating unit and Passive Reactive Power Compensation unit are arranged in parallel with load, power quality therein
Active compensation unit is connect by current sampling unit with power grid, the electric current for acquiring power grid；
The phase-change switch group is arranged with load in series；
The system controller is connect by current sampling unit and voltage sampling unit with power grid, the electric current for acquiring power grid
With voltage；
The system controller by communication unit respectively with electric energy quality active compensating unit, Passive Reactive Power Compensation unit and change
Phase switching group connects, the operation for controlling each unit.
2. low-voltage network utility power quality control system according to claim 1, it is characterised in that：
The voltage sampling unit is threephase potential transformer or voltage differential sample circuit, and the current sampling unit is three-phase
Current transformer.
3. low-voltage network utility power quality control system according to claim 1, it is characterised in that：The communication unit is
Micro-power wireless communication unit.
4. low-voltage network utility power quality control system according to claim 1, it is characterised in that：The communication unit is
Power carrier communication unit.
5. low-voltage network utility power quality control system according to any one of claims 1 to 4, it is characterised in that：
The system controller includes arithmetic element, sequential logic unit and control unit,
The arithmetic element is used to calculate low-voltage network according to the electric current of power grid, voltage and each phase-change switch group load data
Tri-phase unbalance factor, power factor and percent harmonic distortion；
The sequential logic unit is used to tri-phase unbalance factor, power factor and percent harmonic distortion being compared with preset value,
Judge whether tri-phase unbalance factor, power factor and percent harmonic distortion are qualified；
Described control unit is used to control electric energy quality active compensating unit, passive nothing according to the judging result of sequential logic unit
The operation of work(compensating unit and phase-change switch group；And it is obtained according to the electric current of power grid and each phase-change switch group load data operation
The switch motion logic of each phase-change switch group.
6. carrying out the side of utility power quality control based on any low-voltage network utility power quality control systems of claim 1-5
Method, it is characterised in that：
1) electric current and voltage for acquiring power grid, calculate the tri-phase unbalance factor of low-voltage network；
2) judge whether tri-phase unbalance factor is exceeded, if not exceeded execution step 5), if exceeded, execute step 3)；
3) according to system power, then according to each phase-change switch group load data, operation obtains each phase-change switch group switch motion
Logic, each phase-change switch group put into operation；
4) electric current and voltage for acquiring power grid again, calculate the tri-phase unbalance factor and power factor of low-voltage network；Judge three
Whether phase degree of unbalancedness is exceeded, if exceeded execution step 8), if qualified execute step 5)；
5) judge whether system power factor is qualified, if unqualified, Passive Reactive Power Compensation unit puts into operation, if qualified,
Execute step 7)；
6) electric current, the voltage of power grid, computing system power factor and percent harmonic distortion are acquired again, judge whether power factor closes
Lattice execute step 8) if unqualified, if qualified execute step 7)；
7) judge whether percent harmonic distortion is exceeded, if qualified, return to step 2)；If unqualified, step 8) is executed；
8) electric energy quality active compensating unit puts into operation.
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