CN110391674A - Special converter for transformer area and control method thereof - Google Patents
Special converter for transformer area and control method thereof Download PDFInfo
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- CN110391674A CN110391674A CN201910626087.6A CN201910626087A CN110391674A CN 110391674 A CN110391674 A CN 110391674A CN 201910626087 A CN201910626087 A CN 201910626087A CN 110391674 A CN110391674 A CN 110391674A
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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
- 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
- H02J13/00001—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 the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H02J13/0062—
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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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- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- 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
- H02J3/381—Dispersed generators
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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
- Y02E40/30—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
- Y02E40/50—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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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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
- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
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Abstract
The invention provides a transformer area special current transformer and a control method thereof, wherein the transformer area special current transformer comprises a power module, a starting module, an isolation transformer, a detection module, a filtering module, a direct current capacitor, a control module, a display control module, a direct current interface, a communication module and an auxiliary part; the control method is provided on the basis of the structure function of the converter and comprises the following steps: the distribution transformer outputs three-phase voltage and current in real time, the working state or the standby state of the converter is determined by the detection module and the control module, and the working state comprises a stage of providing reactive compensation only by the converter, or a stage of providing reactive compensation and active compensation by the converter and the energy storage battery, or only serving as a rectifying device to charge the energy storage battery. The invention solves the problem of heavy load of the distribution transformer area, effectively reduces the three-phase unbalance, reduces the capacity configuration requirement of the energy storage battery of the distribution transformer area, and saves the occupied area of the converter and the whole system.
Description
Technical field
The present invention relates to power distribution station Treatment process fields, and in particular to the dedicated current transformer in a kind of area and its controlling party
Method.
Background technique
With the electrified horizontal continuous improvement in town and country, town and country business economic amount constantly expands, and Distribution Network Load Data is constantly soaring,
Daily load peak-valley difference gradually widens, and the distribution transforming of platform area is directly the power supply of terminal power load, is influenced by power load, leads to low-voltage platform
Trip phenomenon caused by area's distribution transforming heavy-overload, voltage out-of-limit takes place frequently.Discovery is practiced and is investigated, power distribution station heavy duty or overload are existing
As major part is along with three-phase imbalance, wherein wherein heavy overload condition occurs in a phase, neutral point voltage is caused to deviate, it is neutral
Line flows through high current, and three-phase voltage asymmetry causes distribution transforming to be tripped.
Upgraded at present by capacity of distribution transform, the mode that route is transformed can effectively solve the feelings of platform area distribution transforming heavy duty overload
Condition, but it is long that the period is transformed, and can not solve the problems, such as line load three-phase imbalance, and utilization rate of equipment and installations is low or even increases line loss；It is logical
Cross install additional capacitor group mode can only compensating reactive power, static reactive generator SVG reactive power compensator can control to a certain degree
Three-phase imbalance is managed, the negative-sequence current and zero-sequence current occurred when offsetting uneven, but active power can not be provided, solve distribution transforming
Overload problem；Power adjustment is carried out to loaded network by manually relocating phase modulation, this processing mode is difficult to meet transient stability
The requirement of property, and effect is poor.
A kind of three-phase imbalance intelligent apparatus disclosed in patent 201620102238.X, by using multiple groups inductor-capacitor
Triangle and star compensation network are determined that index balances combined compensation network by compensating controller, are given using residual induction-capacitor
Loss minimization scheme out, this method can utilize maximum with element, but capacitor and inductor storage energy characteristic causes device real
When responding ability it is limited, and active support can not be provided；
Patent 201710036893.9 discloses a kind of multiple-variable flow type three-phase imbalance load integrated control structure
And control strategy, multiple current transformers are connected in parallel in three-phase four-wire system network system, the high/low performance complement of multimode coordinates current transformer
It is grid-connected, it takes distribution of compensation to substitute traditional comprehensive compensation control strategy, is high property close to first current transformer of step down side
Energy current transformer, plays and filters out power grid three-phase imbalance harmonic current, and it is uneven that remaining low performance current transformer mean allocation controls three-phase
The watt current that weighs and reactive current.Invention achieves the distribution controls of balance three-phase active and reactive compensation and harmonic wave abatement functions
Purpose processed improves power quality, improves distribution transformer power factor (PF), and then improve transformer life and efficiency.
The problems such as comprehensive treatment power distribution station distribution transforming heavy duty overload, three-phase imbalance, reactive compensation, proposes to Utilities Electric Co.
Requirements at the higher level need to comprehensively consider the Governance Ability of configuration equipment, capacity, occupied area, cost, the various aspects such as construction period
Limitation.Existing reactive power compensator Governance Ability is limited；By energy accumulation current converter in parallel can achieve administer three-phase imbalance and
The purpose of active power is provided, but system footprint area is big, cost is higher than the mating range in platform area.
Summary of the invention
The purpose of the present invention improves in view of the deficiencies of the prior art, proposes the dedicated current transformer in a kind of area and its control
Method processed, to achieve the goals above, the technical solution adopted by the present invention is that:
Transformation is isolated in a kind of dedicated current transformer in area, including DC capacitor, power module, starting module, filter module
Device, detection module, control module, display control module, DC interface, communication module and slave part；Wherein, DC interface, direct current
Capacitor, power module, starting module, filter module, isolating transformer sequentially connect, and slave part connects power with control module
Module, the low-voltage distribution cabinet of detection module link control module and load, detection module are additionally coupled to isolating transformer, and direct current connects
Mouth is connected to energy-storage battery, and display control module is for carrying out as the result is shown；Low-voltage distribution cabinet by detection module detection load is defeated
It side electric current, information of voltage and is calculated out, power module is controlled according to calculated result and issues or absorb reactive current in real time, with
It eliminates heavy duty caused by platform area distribution transforming three-phase imbalance to overload, while issuing or absorbing by the energy-storage battery of DC interface connection
Active power.
According to above scheme, control module includes core control processor, for calculating sampled signal, by patrolling
Volume judgement, closed-loop control, protection control, pulse width modulation controlled issue modulation waveform driving power device issue and absorb it is active,
It is idle；For communication module for the communication between inside current transformer and outside, communication interface is total comprising Ethernet, serial ports 485, CAN
Line, communication protocol include modbus and 104 agreements.
According to above scheme, display control module has external Human-machine Control touch screen, is divided into local mode and distant place control mould
Formula；Wherein, local mode is to pass through touch screen control active power of output and reactive power；Distant place control model includes unmanned value
It keeps mode and receives higher level's scheduling controlling mode；In addition, touch screen shows output current of converter, voltage, power network current, electricity
Pressure, operating parameter, warning message and the logout of the systems such as junior's energy-storage battery, while carrying out charge and discharge start-up and shut-down control.
According to above scheme, detection module passes through detection distribution transformer low-pressure side output voltage, electric current or directly reading
Distribution low-voltage side CT, PT current-voltage information is taken, while acquiring output current of converter information of voltage, is inputted as control module
Amount.
According to above scheme, power module is the bridge-type two-way convertor circuit based on full-controlled device IGBT, passes through control
The conducting and shutdown of IGBT, the amplitude for adjusting exchange side output voltage are compared with the amplitude of grid side, absorb or issue nothing
Function power；Or active power is issued or absorbed to power grid, realization power grid energy two-way circulates with junior's energy-storage battery energy；Filter
Wave module is filtered by LC or LCL filter part is constituted, for eliminating the higher harmonic component for including in output electric current.
According to above scheme, DC capacitor is as bridge-type current transformer energy-storage travelling wave tube, and on the one hand output DC voltage passes through inverse
Become bridge for DC voltage inversion as alternating voltage；Another aspect stable DC busbar voltage, storage energy provide bidirectional converter
Required ripple unsteady flow；Starting module includes start-up resistor and by-pass switch, and by-pass switch is series-parallel with start-up resistor, starting
When start-up resistor investment to prevent starting moment from burning DC capacitor and power device, and capacitor is pre-charged；After starting
Start-up resistor is bypassed by by-pass switch, reduces active loss.
According to above scheme, isolating transformer is low pressure isolating transformer, and one end is connected with power grid, and another termination starts mould
Block has electric insulation, and high-frequency harmonic is inhibited to seal in control loop, reduces the effect that secondary side voltage input requires；Direct current connects
Mouth is access energy-storage battery DC electrical interface；Slave part includes alternating current-direct current breaker, contactor, and 220V power interface is auxiliary
Help ups power interface.
A kind of dedicated converter control method in area is carried out for the dedicated current transformer in the platform area described in preceding solution
Control, comprising:
Three-phase voltage, electric current are exported by current transformer detection module real-time monitoring distribution transformer, control module is according to inspection
Measured data judges whether distribution transforming threephase load rate reaches threshold value D1 respectively；
If wherein a phase reaches, current transformer enters a stage adjustment state, and calculates three-phase needs by control module
The reactive current of compensation；
Control module note and the reactive current of current transformer one stage adjustment state compensation, simulation calculate distribution transforming threephase load
Rate simultaneously judges whether to reach threshold value D1；If it is not, current transformer is in a stage compensating coefficient, three-phase reactive compensation is only provided, until
Threephase load rate is lower than threshold value D2；If so, current transformer enters two-stage compensating coefficient, while compensating active power and idle function
Rate, and offset, driving power switch device conductive and shutdown are determined by control module, output phase answer it is active and idle, directly
It is lower than threshold value D2 to threephase load rate；
When distribution transforming threephase load rate is not up to threshold value D1, judge whether energy-storage battery electricity needs to compensate, if then becoming
It flows device active control to charge to battery, until energy-storage battery electricity restores to setting value.
According to above scheme, the compensation of one stage of current transformer is reactive compensation, by adjusting the output of bridge-type AC side of converter
The amplitude of voltage is compared with the amplitude of grid side, under the action of connecting isolating transformer, is absorbed or is issued idle, reach
The single-phase heavy duty overload purpose of distribution transforming is solved to dynamic passive compensation；The current transformer two-stage compensates while compensating active power and idle
Power, preferentially by way of compensating reactive power, the negative phase-sequence and zero-sequence current generated with nominal reactive output offset three-phase imbalance,
Remaining active power is provided by energy-storage battery secondly by the mode of inversion.
According to above scheme, load factor threshold value is the ratio of load with distribution transformer capacity, wherein D1 > D2；Energy storage electricity
Pond electricity monomer battery voltage or energy-storage battery state-of-charge (SOC) characterize.
The beneficial effects of the present invention are:
The dedicated current transformer in a kind of area provided by the invention and its control method, take compensation way stage by stage, preferential to mend
Repay the mode of reactive power, solve because single-phase load capacity is larger, three-phase imbalance seriously caused by distribution transforming heavy duty overload problem,
When reactive compensation can not solve distribution transforming heavy duty overload problem, control current transformer exports active and reactive power, this change simultaneously
Device design and control method, the real-time dynamic smoothing compensating power of energy and active power are flowed, and realizes capacitive and inductive reactive power
Power, the bidirectional compensating of active power effectively reduce tri-phase unbalance factor while solving distribute-electricity transformer district heavy duty；Simultaneously
Power distribution station energy-storage battery capacity configuration requirement is effectively reduced, the occupied area of current transformer and whole system is saved, is improved
Economy has higher promotional value.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the dedicated converter device structure chart in platform area of the present invention；
Fig. 2 is control module current direct control method；
Fig. 3 is control module Current Indirect Control Method；
Fig. 4 is two level topological structure of power module；
Fig. 5 is power module three-level topology structure.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
Fig. 1 is the dedicated converter device structure chart in platform area of the present invention, including DC capacitor, power module, starting module, filter
Wave module, isolating transformer, detection module, control module, display control module, DC interface, communication module and slave part；Its
In, DC interface, DC capacitor, power module, starting module, filter module, isolating transformer sequentially connect, slave part and
Control module connects power module, the low-voltage distribution cabinet of detection module link control module and load, and detection module is additionally coupled to
Isolating transformer, DC interface are connected to energy-storage battery, and display control module is for carrying out as the result is shown；It is negative by detection module detection
The low-voltage distribution cabinet outlet side electric current of load, information of voltage are simultaneously calculated, and are controlled power module according to calculated result and are issued in real time
Or reactive current is absorbed, to eliminate the overload of heavy duty caused by platform area distribution transforming three-phase imbalance, while by DC interface connection
Energy-storage battery issues or absorbs active power.
According to above scheme, control module includes core control processor, for calculating sampled signal, by patrolling
Volume judgement, closed-loop control, protection control, pulse width modulation controlled issue modulation waveform driving power device issue and absorb it is active,
It is idle；For communication module for the communication between inside current transformer and outside, communication interface is total comprising Ethernet, serial ports 485, CAN
Line, communication protocol include modbus and 104 agreements.
According to above scheme, display control module has external Human-machine Control touch screen, is divided into local mode and distant place control mould
Formula；Wherein, local mode is to pass through touch screen control active power of output and reactive power；Distant place control model includes unmanned value
It keeps mode and receives higher level's scheduling controlling mode；In addition, touch screen shows output current of converter, voltage, power network current, electricity
Pressure, operating parameter, warning message and the logout of the systems such as junior's energy-storage battery, while carrying out charge and discharge start-up and shut-down control.
According to above scheme, detection module passes through detection distribution transformer low-pressure side output voltage, electric current or directly reading
Distribution low-voltage side CT, PT current-voltage information is taken, while acquiring output current of converter information of voltage and power module temperature
Degree, external energy-storage battery information, as control module input quantity.
According to above scheme, power module is the bridge-type two-way convertor circuit based on full-controlled device IGBT, passes through control
The conducting and shutdown of IGBT, the amplitude for adjusting exchange side output voltage are compared with the amplitude of grid side, absorb or issue nothing
Function power；Or active power is issued or absorbed to power grid, realization power grid energy two-way circulates with junior's energy-storage battery energy；Filter
Wave module is filtered by LC or LCL filter part is constituted, for eliminating the higher harmonic component for including in output electric current.
According to above scheme, DC capacitor is as bridge-type current transformer energy-storage travelling wave tube, and on the one hand output DC voltage passes through inverse
Become bridge for DC voltage inversion as alternating voltage；Another aspect stable DC busbar voltage, storage energy provide bidirectional converter
Required ripple unsteady flow；Starting module includes start-up resistor and by-pass switch, and by-pass switch is series-parallel with start-up resistor, starting
When start-up resistor investment to prevent starting moment from burning DC capacitor and power device, and capacitor is pre-charged；After starting
Start-up resistor is bypassed by by-pass switch, reduces active loss.
According to above scheme, isolating transformer is low pressure isolating transformer, and one end is connected with power grid, the other end and current transformer
Filter module is connected, and has electric insulation, and high-frequency harmonic is inhibited to seal in control loop, reduces the work that secondary side voltage input requires
With；DC interface is access energy-storage battery DC electrical interface；Slave part includes alternating current-direct current breaker, contactor, 220V electricity
Source interface assists ups power interface.
The control module includes high-speed industrial grade DSP core processor and is furnished with powerful fpga chip, is calculated
Realize that idle and active power output is completed in closed-loop control, relay protective scheme control using totally digitilized technology with logical process
It is controlled with absorbing；The closed-loop control can be Current direct control, as shown in Figure 2；It is also possible to electric current to indirectly control, such as schemes
Shown in 3.
The communication module is connected by serial communication mode with display control module, and serial ports or ether net mode and higher level are passed through
Monitoring and junior's energy-storage battery carry out information mutual communication, and communication protocol uses modbus or 104 specifications.
The power module is the two-way current conversion circuit of full-controlled device IGBT, and the two-way current conversion circuit can be two level
Structure is even connected (more level) or (multiplex) chain in parallel as shown in Figure 5 as shown in figure 4, be also possible to three-level structure
Formula topological structure, two level block are suitable for small dosage low-voltage-grade, and more level or chain topology can be with
Reach higher voltage class and capacity requirement.
It is special for the platform area described in preceding solution the present invention provides a kind of dedicated converter control method in area
It is controlled with current transformer, comprising steps of
1) by current transformer detection module real-time monitoring distribution transformer output voltage, electric current, control module is according to detection
Data judge whether distribution transforming threephase load rate reaches current transformer starting threshold value D1 respectively.
2) if wherein a phase load rate reaches current transformer starting threshold value, current transformer enters a stage adjustment state, and passes through
Control module calculates the reactive current that three-phase needs to compensate.
3) control module note and the reactive current of current transformer one stage adjustment state compensation, simulation calculate distribution transforming threephase load
Rate simultaneously judges whether threephase load rate is higher than threshold value D1；If it is not, current transformer carries out stage compensation, reactive compensation is only provided, directly
It is lower than threshold value D2 to threephase load rate；If so, current transformer enters two-stage compensating coefficient, while compensating active power and idle function
Rate, and offset and driving power switch device conductive and shutdown are determined by control module, output phase answer it is active and idle, directly
It is lower than threshold value D2 to threephase load rate；If if judging that distribution transforming is that three-phase reaches calculating demand and has work value in distribution transforming heavy duty, controlling
Energy storage system discharges processed；
5) when distribution transforming threephase load rate is not up to threshold value D1, judge whether energy-storage battery needs to compensate electricity, if then
Current transformer active control charges to battery, until energy-storage battery SOC restores to setting value.
One stage of the current transformer compensation is reactive compensation, i.e. the width by adjusting bridge-type AC side of converter output voltage
Value is compared with the amplitude of grid side, under the action of connecting isolating transformer, absorbs or issue idle, realization dynamic nothing
The purpose of function compensation；
The current transformer two-stage compensates while compensating active power and reactive power, preferentially passes through the side of compensating reactive power
Formula, the negative phase-sequence generated with nominal reactive output offset three-phase imbalance and zero-sequence current, secondly by the mode of inversion by energy storage
Battery provides remaining active power.
The load factor threshold value is the ratio of load with distribution transformer capacity, wherein D1 > D2；Energy-storage battery electricity is used
Monomer battery voltage or energy-storage battery state-of-charge (SOC) characterize.
The dedicated current transformer in a kind of area provided by the invention and its control method, take compensation way stage by stage, preferential to mend
Repay the mode of reactive power, solve because single-phase load capacity is larger, three-phase imbalance seriously caused by distribution transforming heavy duty overload problem,
When reactive compensation can not solve distribution transforming heavy duty overload problem, control current transformer exports active and reactive power, this change simultaneously
Device design and control method, the real-time dynamic smoothing compensating power of energy and active power are flowed, and realizes capacitive and inductive reactive power
Power, the bidirectional compensating of active power effectively reduce tri-phase unbalance factor while solving distribute-electricity transformer district heavy duty；Simultaneously
Power distribution station energy-storage battery capacity configuration requirement is effectively reduced, the occupied area of current transformer and whole system is saved, is improved
Economy has higher promotional value.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (10)
1. a kind of dedicated current transformer in area, it is characterised in that: including DC capacitor, power module, starting module, filter module,
Isolating transformer, detection module, control module, display control module, DC interface, communication module and slave part；Wherein, direct current connects
Mouth, DC capacitor, power module, starting module, filter module, isolating transformer sequentially connect, slave part and control module
Power module, the low-voltage distribution cabinet of detection module link control module and load are connected, detection module is additionally coupled to isolation transformation
Device, DC interface are connected to energy-storage battery；Communication module is connected by serial communication mode with display control module, and display control module is used for
It carries out as the result is shown；By the low-voltage distribution cabinet outlet side electric current of detection module detection load, information of voltage and calculated, root
Reactive current is issued or absorbed in real time according to calculated result control power module, to eliminate weight caused by platform area distribution transforming three-phase imbalance
Overload is carried, while active power is issued or absorbed by the energy-storage battery of DC interface connection.
2. according to the described in claim 1 dedicated current transformer in area, which is characterized in that control module includes core control processor,
For calculating sampled signal, pass through logic judgment, closed-loop control, protection control, pulse width modulation controlled sending modulating wave
Shape driving power device is issued and is absorbed active and reactive；Communication module is for the communication between inside current transformer and outside, communication
Interface includes Ethernet, serial ports 485, CAN bus, and communication protocol includes modbus and 104 agreements.
3. according to the described in claim 1 dedicated current transformer in area, which is characterized in that display control module and control module communicate to connect,
With external Human-machine Control touch screen, it is divided into local mode and distant place control model；Wherein, local mode is to pass through touch screen control
Active power of output processed and reactive power；Distant place control model includes unattended mode and reception higher level's scheduling controlling mode；
In addition, touch screen shows output current of converter, voltage, power network current, voltage, the operation ginseng of the systems such as junior's energy-storage battery
Number, warning message and logout, while carrying out charge and discharge start-up and shut-down control.
4. according to the described in claim 1 dedicated current transformer in area, which is characterized in that detection module is low by detection distribution transformer
Pressure side output voltage, electric current directly reads distribution low-voltage side CT, PT current-voltage information, while acquiring current transformer output electricity
Information of voltage is flowed, as control module input quantity.
5. according to the described in claim 1 dedicated current transformer in area, which is characterized in that power module is based on full-controlled device IGBT's
Bridge-type two-way convertor circuit adjusts the amplitude and grid side for exchanging side output voltage by controlling the conducting and shutdown of IGBT
Amplitude is compared, and absorbs or issue reactive power；Or active power is issued or absorbed to power grid, realize power grid energy and junior
Energy-storage battery energy two-way circulates；Filter module is filtered by LC or LCL filter part is constituted, and wraps for eliminating in output electric current
The higher harmonic component contained.
6. according to the dedicated current transformer in platform area described in claim 5, which is characterized in that DC capacitor is as bridge-type current transformer energy storage member
Part, on the one hand exporting DC voltage by inverter bridge is alternating voltage by DC voltage inversion；Another aspect stable DC bus
Voltage, storage energy provide ripple unsteady flow required for bidirectional converter；Starting module includes start-up resistor and by-pass switch,
By-pass switch is series-parallel with start-up resistor, and start-up resistor investment is prevents starting moment from burning DC capacitor and power device when starting
Part, and capacitor is pre-charged；Start-up resistor is bypassed by by-pass switch after starting, reduces active loss.
7. according to the described in claim 1 dedicated current transformer in area, which is characterized in that isolating transformer is low pressure isolating transformer,
One end is connected with power grid, another termination starting module, has electric insulation, and high-frequency harmonic is inhibited to seal in control loop, reduces by two
The effect that secondary side voltage input requires；DC interface is access energy-storage battery DC electrical interface；Slave part includes alternating current-direct current
Breaker, contactor, 220V power interface assist ups power interface.
8. the control method of a kind of dedicated current transformer in area, for dedicated the platform area as described in claim 1-8 any one
Current transformer is controlled characterized by comprising
Three-phase voltage, electric current are exported by current transformer detection module real-time monitoring distribution transformer, control module is according to testing number
According to judge respectively distribution transforming threephase load rate whether reach current transformer starting threshold value D1；
If wherein a phase reaches D1, current transformer enters a stage adjustment state, and calculates three-phase by control module and need to mend
The reactive current repaid；
Control module note and the reactive current of current transformer one stage adjustment state compensation, simulation calculate distribution transforming threephase load rate simultaneously
Judge whether to reach threshold value D1；If it is not, current transformer is in a stage compensating coefficient, three-phase reactive compensation is only provided, until three-phase
Load factor is lower than current transformer preset threshold D2；If so, current transformer enters two-stage compensating coefficient, while compensating active power and nothing
Function power, and offset, driving power switch device conductive and shutdown are determined by control module, output phase answers active and nothing
Function, until threephase load rate is lower than threshold value D2；
When distribution transforming threephase load rate is not up to threshold value D1, judge whether energy-storage battery electricity needs to compensate, if then current transformer
Active control charges to battery, until energy-storage battery electricity restores to setting value.
9. according to the control method of the according to any one of claims 8 dedicated current transformer in area, which is characterized in that the compensation of one stage of current transformer is
Reactive compensation, the amplitude by adjusting bridge-type AC side of converter output voltage are compared with the amplitude of grid side, are connecting
Under the action of isolating transformer, absorb or issue it is idle, reach dynamic passive compensation solve distribution transforming it is single-phase heavy duty overload purpose；
The current transformer two-stage compensates while compensating active power and reactive power, preferentially by way of compensating reactive power, with nominal reactive
The negative phase-sequence and zero-sequence current that output offset three-phase imbalance generates, providing residue by energy-storage battery secondly by the mode of inversion has
Function power.
10. according to the control method of the according to any one of claims 8 dedicated current transformer in area, which is characterized in that load factor threshold value is load
With the ratio of distribution transformer capacity, wherein D1 > D2；Energy-storage battery electricity monomer battery voltage or the charged shape of energy-storage battery
State (SOC) characterizes.
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| CN117748518A (en) * | 2024-02-21 | 2024-03-22 | 上海派能能源科技股份有限公司 | Treatment method for terminal voltage of low-voltage power grid and energy storage equipment |
| CN117748518B (en) * | 2024-02-21 | 2024-05-07 | 上海派能能源科技股份有限公司 | Treatment method for terminal voltage of low-voltage power grid and energy storage equipment |
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