CN104201694B - A kind of Intelligent Dynamic blendes together reactive compensation system and its control method - Google Patents
A kind of Intelligent Dynamic blendes together reactive compensation system and its control method Download PDFInfo
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- CN104201694B CN104201694B CN201410448284.0A CN201410448284A CN104201694B CN 104201694 B CN104201694 B CN 104201694B CN 201410448284 A CN201410448284 A CN 201410448284A CN 104201694 B CN104201694 B CN 104201694B
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Abstract
The present invention relates to a kind of Intelligent Dynamic blendes together reactive compensation system and its control method, for reactive-load compensation regulation is carried out to electrical network.Intelligent Dynamic blendes together the efficient coordination control that reactive compensation system compensates branch road and SVG compensation branch road by SVC, thus reaching the ability of accurate compensation and transient response, can realize in range of capacity from capacitive to perceptual continuous, smooth adjustment, can solve the problem that the jump of reactive power problem causing due to impact load, suppression line voltage due to big load start-stop or runs into the flickering that failure condition causes and falls effectively, raising system is exerted oneself, simultaneously, SVC is compensated branch road and is combined with SVG compensation branch road, make product in compensation characteristic, cost, the aspects such as reliability reach optimum, cost performance is higher.
Description
Technical field
The present invention relates to a kind of Intelligent Dynamic blendes together reactive compensation system and its control method, belong to Power Electronic Technique neck
Domain.
Background technology
In modern industry system, ac arc furnace, electric railway, heavy (merchant) mill etc. belong to dynamic change
Nonlinear-load.The feature of this type load is that catch cropping quickly changes active power at any time with reactive power, due to its non-linear and
Unbalanced use electrical characteristics, make the voltage waveform of power supply grid be distorted, and cause fluctuation, flickering and the three-phase of voltage uneven
Weighing apparatus, or even cause the fluctuation of system frequency, and inject substantial amounts of harmonic wave to system, the quality of power supply of electrical network is constituted seriously
Threat.
Static passive compensation device (abbreviation SVC) is a kind of device of quick regulation reactive power, and its Typical Representative is brilliant
Brake tube controls reactor+fixed capacity device (TCR+FC), thyristor switchable capacitor (TSC) and magnet controlled reactor+fixation electricity
Container (MCR+FC) etc..It has been applied successfully in the compensation of the impact loads such as metallurgy, mining and electric railway at present.This
Planting device all has substantially than synchronized earlier phase modifier at the aspect such as functional diversity, functional reliability and investment and operating cost
Advantage, achieve preferable technical economic benefit, thus at home and abroad developed faster and practical application.
Based on the basis of SVC technical research, sending out with device for high-power power electronic such as GTO, IGCT, IGBT
Exhibition and applying, static reacance generator (abbreviation SVG) becomes latest generation Technology of Dynamic Reactive Power Compensation, possess fast response time,
Absorb the outstanding advantages such as idle higher hamonic wave amount that is continuous, producing is little, range of accommodation is wide, loss is little with noise, in the quality of power supply
Play a greater and greater role with the field of reactive-load compensation research.
, compared with SVG, SVC operating cost is low, better economy for SVC, but SVC response speed is slow, and response time needs
20～40ms, and response time is the main determining factor of suppression voltage fluctuation flickering, SVC low-response is it is impossible to effective suppress electricity
Pressure flickering.Compared with SVC, SVG dynamic compensation effect is good, fast response time, and response time is less than 5ms, can effectively suppress electricity
Pressure fluctuation and flickering；Insensitive to systematic parameter, safety with stability preferably, will not occur the situation of Harmonics amplification.But
SVG is because by components and parts capacity limit, jumbo SVG performance difficulty, construction costs is high.
Content of the invention
It is an object of the invention to overcoming the shortcomings of above-mentioned each device, by with reference to the respective advantage of two kinds of devices, to carry
Good, the fast response time for a kind of dynamic characteristic, can effectively suppress voltage fluctuation and flicker, improve the quality of power supply, and can
Realize dynamically blending together reactive compensation system and its control method from the intelligent of capacitive to perceptual Continuous Compensation.
The invention discloses a kind of Intelligent Dynamic blendes together reactive compensation system, for reactive-load compensation regulation is carried out to electrical network,
This compensation system comprises main circuit and controller, and described main circuit comprises to compensate branch road, and described compensation branch road comprises SVC and compensates
Branch road and SVG compensate branch road, and described SVC compensates branch road and SVG compensates branch circuit parallel connection and accesses electrical network, and electrical network is connected with other and bears
Lotus；
Wherein, described SVC compensates branch road, is connected with controller, comprises SVC current sampling circuit, switching control unit
With capacitor compensation branch road, described SVC current sampling circuit gathers the electric current that SVC compensates branch road, and current sampling signal is passed
Transport to controller, described switching control unit receives the switching signal that controller sends, and controls the switching of capacitor compensation branch road；
Described capacitor compensation branch road is the compensation branch road being made up of the capacitor of several trianglees or star-like connection；
Described SVG compensates branch road, is connected with controller, comprises SVG current sampling circuit, inverter circuit, described SVG electricity
Stream sample circuit gathers the electric current that SVG compensates branch road, and current sampling signal is transmitted to controller, described inverter circuit be with
Electric capacity is the three-phase inverter bridge circuit of DC side energy-storage travelling wave tube, and is connected to the grid by current-limiting reactor, for receiving control
The pwm pulse control signal that device sends, and send the reactive current of controllable precise；
Described controller, is connected with electrical network, gathers power network current and line voltage, compensates branch road and SVG by controlling SVC
Compensate branch road, reactive-load compensation is implemented to electrical network.
Preferably, described SVC current sampling circuit gathers, by Hall element, the electric current that SVC compensates branch road, described
SVG current sampling circuit gathers, by Hall element, the electric current that SVG compensates branch road.
Preferably, described controller controls, SVC compensates branch road and the step of SVG compensation branch road is：Controller first gathers
The line voltage of electrical network, power network current, calculate the current reactive power of electrical network, and idle control targe value set in advance is
Zero, according to the difference of the current reactive power of predetermined target value and electrical network, compensate branch road to SVG first and send pwm pulse control
Signal, so as to send the reactive current of controllable precise, compensates branch road then to SVC and sends switching signal, control switching to control single
The switching action of unit, thus implements reactive-load compensation.
Preferably, described controller comprises voltage transformer, current transformer, sample circuit, signal conditioning circuit, A/
D change-over circuit, master cpu, PWM drive circuit, PWM triggers circuit, I/O port digital output circuit, described voltage transformer and electric current are mutual
Sensor connection electrical network, the signal input signal conditioning circuit that voltage transformer, current transformer are collected by described sample circuit,
The signal handled well is inputted to master cpu after A/D change-over circuit by signal conditioning circuit, and master cpu generates pwm pulse instruction
With switching control signal, pwm pulse instruction send corresponding pwm pulse control signal through PWM drive circuit, PWM triggers circuit
To described compensation system main circuit to drive SVG to compensate branch road work, switching control signal is through I/O port digital output circuit to described
The main circuit of compensation system compensates branch road work to drive SVC.
Further, described controller also includes phase-locked loop circuit, over-current detection circuit, over-voltage detection circuit, PWM fault
Feedback circuit and communication CPU, wherein：
Described phase-locked loop circuit, is connected with signal conditioning circuit, and the voltage signal that signal conditioning circuit is handled well is entered
Horizontal lock, and result is delivered to master cpu.By this phase-locked loop circuit, system can quick lock in electrical network phase and frequency,
Realize the precise synchronization with electrical network it is ensured that SVG compensates the control accuracy of branch road reactive current.
Described over-current detection circuit, is connected with signal conditioning circuit, the Intelligent Dynamic that signal conditioning circuit is handled well
Blend together reactive compensation system side electric current and carry out real-time detection, when overcurrent is detected, direct locking PWM drive circuit, and will
Fault-signal feeds back to master cpu.By over-current detection circuit, produce fault or because outside cause causes fault in system
In the case of, system can achieve quick overcurrent protection, this protection can be automatically obtained by over-current detection hardware circuit it is not necessary to
Software intervention, protection speed is fast, effectively improves system operation safety.
Described over-voltage detection circuit, is connected with signal conditioning circuit, the DC capacitor that signal conditioning circuit is handled well
Voltage carries out real-time detection, when overvoltage is detected, direct locking PWM drive circuit, and fault-signal is fed back to master control
CPU.By over-voltage detection circuit, in the case that system produces fault or causes fault due to outside cause, system can achieve
Quickly DC voltage overvoltage protection, by overvoltage, this protection can detect that hardware circuit be automatically obtained it is not necessary to software intervention,
Protection speed is fast, effectively improves system operation safety.
Described PWM fault feedback circuit, is connected with main circuit, and the IGBT fault-signal obtaining from main circuit is sent to
PWM drive circuit, this fault-signal is fed back to master cpu by PWM drive circuit again.By PWM fault feedback circuit, in IGBT
In the case of fault, controller can feed back signal automatic blocking pwm pulse signal according to PWM fault it is not necessary to software intervention, protects
Shield speed is fast, effectively improves system operation safety.
Described communication CPU, carries out two-way data interaction with master cpu by dual port RAM circuit；Described communication CPU is also
It is connected with data access circuitry, communication CPU writes data into and carries out data storage in data access circuitry, controller power-off restarting
When read out data again；Communication CPU is connected with all kinds of communicating circuits, Ethernet communication circuit, RS-232 communicating circuit, RS-
With message between the man machine interface that 485 communicating circuits, RS-485 communicating circuit and Intelligent Dynamic blend together outside reactive compensation system
Form carry out data interaction.Communication CPU is mainly used in the access of operational parameter data, and the calculating of communication data and aobvious
Show.Communication CPU and master cpu are separated, and are each responsible for different functions, are favorably improved master cpu operational efficiency.
This Intelligent Dynamic blendes together reactive compensation system and SVG compensation branch road is combined with SVC compensation branch road, and SVG compensates and props up
As a quickly controlled reactive source in Lu Qi adjustable extent, anti-in time for making to the dynamic part in reactive requirement
Should；SVC compensates the branch road then reactive power compensation in the case of steady for System Reactive Power.SVG compensates branch road and compensates branch road with SVC
Both mutually coordinated cooperation, and each relatively independent work, to meet different reactive-load compensation demands.It is different from traditional idle benefit
Repay device, this Intelligent Dynamic blendes together reactive compensation system all to be had substantially at aspects such as device motility, response speed, cost performances
Advantage.
The invention also discloses a kind of control method blending together reactive compensation system based on above-mentioned Intelligent Dynamic, methods described
Comprise the steps of：
Step 1, controller gather the line voltage of electrical network, power network current from electrical network, calculate the current idle work(of electrical network
Rate QSYS,
Step 2, first, with QSYSRepresent power system reactive power, QSVG volumeRepresent that SVG compensates the nominal reactive compensation appearance of branch road
Amount, QSVGRepresent that SVG compensates the reactive power that branch road compensates, QSVC throws limitRepresent that SVC compensates branch road and puts into reactive power during electric capacity
Input threshold quantity arranges value, QSVC cuts limitRepresent that SVC compensates reactive power excision thresholding arranges value during branch road excision electric capacity, M represents
SVC compensates the capacitor bank number of branch road input, and N represents that SVC compensates the capacitor bank number that branch road does not put into, UVoltageRepresent electrical network
Voltage, ULower limitRepresent the minima of normal voltage, UThe upper limitRepresent the maximum of normal voltage；Then, obtained according to real-time detection
Power system reactive power QSYS, when | QSYS|>When 0, judge that SVG compensates the reactive power numerical value that branch road need to compensate | QSVGQSYS| whether
Compensate the nominal reactive compensation capacity of branch road beyond SVG | QSVG volume|, if exceeded, SVG compensates reactive power that branch road compensates etc.
In | QSVG volume| or | QSVG volume|, if without departing from the reactive power that SVG compensates branch road compensation is equal to QSVGQSYS, controller by this
Signal is sent to SVG and compensates branch road, makes SVG compensate branch road execution reactive-load compensation；
After step 3, SVG compensate branch road execution reactive-load compensation, controller is to line voltage UVoltageJudged：If ULower limit<
UVoltage<UThe upper limitBe false, and if SVC compensate branch road and put into dry condenser, excise and all put into capacitor；If ULower limit<
UVoltage<UThe upper limitSet up, then carry out the judgement that SVC compensates branch road whether switching capacitance；If the actual reactive power Q of electrical networkSYSQSVG
More than QSVC throws limit, and this state continue for certain time, then and in the case that capacitor does not all put into, SVC compensates branch road will
Put into a group capacitor；If QSYSQSVGLess than QSVC cuts limit, and this state continue for certain time, then and incomplete in capacitor
In the case of portion's excision, SVC compensates branch road and will excise a group capacitor.
SVG is compensated branch road with SVC compensation branch road efficiently by the control method that this Intelligent Dynamic blendes together reactive compensation system
Being combined together, when the reactive requirement moment of system there is acute variation, controlling SVG compensation branch road quickly to change it first defeated
Go out, reactive power is carried out quick, dynamic, continuously compensate for, provide the dynamic support to access point voltage and stable state to adjust simultaneously
Whole, thus improving the dynamic of system and steady-state behaviour, suppression reactive power concussion.When disturbance leads to system to enter new stable state work
After work point, then control SVC to compensate branch road input or excise an appropriate number of capacitor bank, unloaded by SVG compensation branch road with undertaking
Under part load or burden without work.The SVG so allowing for mixed compensation device compensates branch road with SVC compensation branch road in unified allocation of resources
Under, by efficient control method for coordinating, SVG compensation capacity needed for effectively reducing, reduces system cost；Accelerate system response simultaneously
Time, suppression voltage ripple of power network and flickering, improve the electrical network quality of power supply.
Its advantage is：The Intelligent Dynamic of the present invention blendes together reactive compensation system and compensates branch road and SVG compensation by SVC
The efficient coordination of branch road controls, thus reaching the ability of accurate compensation and transient response.It is different from the idle benefit of traditional idle TSC type
Repay device condenser capacity to fix, put into or excise reactive power change during capacitor bank and all there is step evolution, Intelligent Dynamic is mixed
Become reactive compensation system to compensate the inverter circuit operation characteristic of branch road due to combining SVG, can achieve continuous, smooth idle benefit
Repay.And SVG compensates branch road and can achieve capacitive to the smooth adjustment of perception, and traditional idle TSC type reactive power compensator is then only
Can compensate for capacitive reactive power.Compensate branch road by SVG to run with SVC compensation branch road coordination control, can solve the problem that due to punching
Hitting property load and the jump of reactive power problem that causes, effectively suppression line voltage due to big load start-stop or run into failure condition and make
Become flickering and fall, raising system is exerted oneself.Meanwhile, SVC is compensated branch road and is combined with SVG compensation branch road, so that product is being compensated
The aspects such as characteristic, cost, reliability reach optimum, and cost performance is higher.
Brief description
Fig. 1 is the main circuit structure figure that Intelligent Dynamic of the present invention blendes together reactive compensation system；
Fig. 2 is the control flow chart that Intelligent Dynamic of the present invention blendes together reactive compensation system；
Fig. 3 is controller principle block diagram in the present invention.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Feature and/or step beyond, all can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), except non-specifically is chatted
State, all can be replaced by other alternative features equivalent or that there is similar purpose.I.e., unless specifically stated otherwise, each feature
It is a series of equivalent or one of similar characteristics example.
A kind of Intelligent Dynamic blendes together reactive compensation system, its main circuit structure as shown in figure 1, for electrical network is carried out idle
Compensation adjustment, this compensation system comprises main circuit and controller, and described main circuit comprises to compensate branch road, described compensation branch road bag
Compensate branch road containing SVC and SVG compensates branch road, described SVC compensates branch road and SVG compensates branch circuit parallel connection and accesses electrical network, and electrical network connects
There are other loads；
Wherein, described SVC compensates branch road, is connected with controller, comprises SVC current sampling circuit, switching control unit
With capacitor compensation branch road, described SVC current sampling circuit gathers, by Hall element, the electric current that SVC compensates branch road, and incites somebody to action
Current sampling signal transmits to controller, and described switching control unit receives the switching signal that controller sends, and controls capacitor
Compensate the switching of branch road；Described capacitor compensation branch road is the compensation being made up of the capacitor of several trianglees or star-like connection
Branch road；
Described SVG compensates branch road, is connected with controller, comprises SVG current sampling circuit, inverter circuit, described SVG electricity
Stream sample circuit gathers, by Hall element, the electric current that SVG compensates branch road, and current sampling signal is transmitted to controller, institute
State the three-phase inverter bridge circuit that inverter circuit is with electric capacity for DC side energy-storage travelling wave tube, and electricity is incorporated to by current-limiting reactor
Net, for receiving the pwm pulse control signal that controller sends, and sends the reactive current of controllable precise；
Described controller, is connected with electrical network, gathers power network current and voltage, and by controlling, SVC compensates branch road and SVG compensates
Branch road, implements reactive-load compensation to electrical network.
Described controller control SVC compensates branch road and the step of SVG compensation branch road is：Controller first gathers the electrical network of electrical network
Voltage, power network current, calculate the current reactive power of electrical network, idle control targe value set in advance is zero, according to default
The difference of the desired value reactive power current with electrical network, compensates branch road to SVG first and sends pwm pulse control signal so as to send out
Go out the reactive current of controllable precise, compensate branch road then to SVC and send switching signal, control the switching of switching control unit to move
Make, thus implement reactive-load compensation.
As shown in figure 3, described controller comprise voltage transformer, current transformer, sample circuit, signal conditioning circuit,
A/D change-over circuit, master cpu, PWM drive circuit, PWM triggers circuit and I/O port digital output circuit, described voltage transformer and electricity
Current transformer connects main electrical network.This blendes together the main working process of reactive compensation system controller：Described sample circuit is by voltage
The signal input signal conditioning circuit that transformer, current transformer collect, signal conditioning circuit is by the signal handled well through A/D
Input after change-over circuit to master cpu, master cpu generates pwm pulse instruction and switching control signal, pwm pulse instructs through PWM
Drive circuit, PWM triggers circuit send corresponding pwm pulse control signal to the main circuit of compensation system to drive SVG to compensate
Branch road works, and the main circuit through I/O port digital output circuit to described compensation system for the switching control signal compensates branch road work to drive SVC
Make.
Further, described controller also includes phase-locked loop circuit, over-current detection circuit, over-voltage detection circuit, PWM fault
Feedback circuit and communication CPU, wherein：
Described phase-locked loop circuit, is connected with signal conditioning circuit, and the voltage signal that signal conditioning circuit is handled well is entered
Horizontal lock, and result is delivered to master cpu.By this phase-locked loop circuit, system can quick lock in electrical network phase and frequency,
Realize the precise synchronization with electrical network it is ensured that SVG compensates the control accuracy of branch road reactive current.
Described over-current detection circuit, is connected with signal conditioning circuit, the Intelligent Dynamic that signal conditioning circuit is handled well
Blend together reactive compensation system side electric current and carry out real-time detection, when overcurrent is detected, direct locking PWM drive circuit, and will
Fault-signal feeds back to master cpu.By over-current detection circuit, produce fault or because outside cause causes fault in system
In the case of, system can achieve quick overcurrent protection, this protection can be automatically obtained by over-current detection hardware circuit it is not necessary to
Software intervention, protection speed is fast, effectively improves system operation safety.
Described over-voltage detection circuit, is connected with signal conditioning circuit, the DC capacitor that signal conditioning circuit is handled well
Voltage carries out real-time detection, when overvoltage is detected, direct locking PWM drive circuit, and fault-signal is fed back to master control
CPU.By over-voltage detection circuit, in the case that system produces fault or causes fault due to outside cause, system can achieve
Quickly DC voltage overvoltage protection, by overvoltage, this protection can detect that hardware circuit be automatically obtained it is not necessary to software intervention,
Protection speed is fast, effectively improves system operation safety.
Described PWM fault feedback circuit, is connected with main circuit, and the IGBT fault-signal obtaining from main circuit is sent to
PWM drive circuit, this fault-signal is fed back to master cpu by PWM drive circuit again.By PWM fault feedback circuit, in IGBT
In the case of fault, controller can feed back signal automatic blocking pwm pulse signal according to PWM fault it is not necessary to software intervention, protects
Shield speed is fast, effectively improves system operation safety.
Described communication CPU, carries out two-way data interaction with master cpu by dual port RAM circuit；Described communication CPU is also
It is connected with data access circuitry, communication CPU writes data into and carries out data storage in data access circuitry, controller power-off restarting
When read out data again；Communication CPU is connected with all kinds of communicating circuits, Ethernet communication circuit, RS-232 communicating circuit, RS-
With message between the man machine interface that 485 communicating circuits, RS-485 communicating circuit and Intelligent Dynamic blend together outside reactive compensation system
Form carry out data interaction.Communication CPU is mainly used in the access of operational parameter data, and the calculating of communication data and aobvious
Show.Communication CPU and master cpu are separated, and are each responsible for different functions, are favorably improved master cpu operational efficiency.
This Intelligent Dynamic blendes together reactive compensation system and SVG compensation branch road is combined with SVC compensation branch road, and SVG compensates and props up
As a quickly controlled reactive source in Lu Qi adjustable extent, anti-in time for making to the dynamic part in reactive requirement
Should；SVC compensates the branch road then reactive power compensation in the case of steady for System Reactive Power.SVG compensates branch road and compensates branch road with SVC
Both mutually coordinated cooperation, and each relatively independent work, to meet different reactive-load compensation demands.It is different from traditional idle benefit
Repay device, this Intelligent Dynamic blendes together reactive compensation system all to be had substantially at aspects such as device motility, response speed, cost performances
Advantage.
A kind of control method blending together reactive compensation system based on above-mentioned Intelligent Dynamic, as shown in Fig. 2 intelligence of the present invention
Dynamic blendes together reactive compensation system control flow chart, and in figure each symbol implication is done as described below：With QSYSRepresent electric network reactive-load work(
Rate, QSVG volumeRepresent that SVG compensates the nominal reactive compensation capacity of branch road, QSVGRepresent that SVG compensates the reactive power that branch road compensates,
QSVC throws limitRepresent that SVC compensates reactive power input threshold quantity arranges value during branch road input electric capacity, QSVC cuts limitRepresent that SVC compensates branch road and cuts
Except reactive power excision thresholding arranges value during electric capacity, M represents that SVC compensates the capacitor bank number of branch road input, and N represents SVC
Compensate the capacitor bank number that branch road does not put into, UVoltageRepresent line voltage, ULower limitRepresent the minima of normal voltage, UThe upper limitJust represent
The often maximum of voltage.
Step 1, controller gather the line voltage of electrical network, power network current from electrical network, calculate the current idle work(of electrical network
Rate QSYS,
Step 2, the power system reactive power Q being obtained according to real-time detectionSYS, when | QSYS|>When 0, judge that SVG compensates branch road and needs
The reactive power numerical value compensating | QSVGQSYS| whether exceed the nominal reactive compensation capacity that SVG compensates branch road | QSVG volume|, if super
Go out, the reactive power that SVG compensates branch road compensation is equal to | QSVG volume| or | QSVG volume|, if without departing from SVG compensates what branch road compensated
Reactive power is equal to QSVGQSYS, this SVG is compensated branch road by controller needs the signal compensating how many reactive powers to be sent to SVG
Compensate branch road, make SVG compensate branch road execution reactive-load compensation；
After step 3, SVG compensate branch road execution reactive-load compensation, controller is to line voltage UVoltageJudged：If ULower limit<
UVoltage<UThe upper limitBe false, and if SVC compensate branch road and put into dry condenser, excise and all put into capacitor；If ULower limit<
UVoltage<UThe upper limitSet up, then carry out the judgement that SVC compensates branch road whether switching capacitance；If the actual reactive power Q of electrical networkSYSQSVG
More than QSVC throws limit, and this state continue for certain time, then and in the case that capacitor does not all put into, SVC compensates branch road will
Put into a group capacitor；If QSYSQSVGLess than QSVC cuts limit, and this state continue for certain time, then and incomplete in capacitor
In the case of portion's excision, SVC compensates branch road and will excise a group capacitor.
SVG is compensated branch road with SVC compensation branch road efficiently by the control method that this Intelligent Dynamic blendes together reactive compensation system
Being combined together, when the reactive requirement moment of system there is acute variation, controlling SVG compensation branch road quickly to change it first defeated
Go out, reactive power is carried out quick, dynamic, continuously compensate for, provide the dynamic support to access point voltage and stable state to adjust simultaneously
Whole, thus improving the dynamic of system and steady-state behaviour, suppression reactive power concussion.When disturbance leads to system to enter new stable state work
After work point, then control SVC to compensate branch road input or excise an appropriate number of capacitor bank, unloaded by SVG compensation branch road with undertaking
Under part load or burden without work.The SVG so allowing for mixed compensation device compensates branch road with SVC compensation branch road in unified allocation of resources
Under, by efficient control method for coordinating, SVG compensation capacity needed for effectively reducing, reduces system cost；Accelerate system response simultaneously
Time, suppression voltage ripple of power network and flickering, improve the electrical network quality of power supply.
The invention is not limited in aforesaid specific embodiment.The present invention expands to and any discloses in this manual
New feature or any new combination, and the arbitrary new method of disclosure or the step of process or any new combination.
Claims (3)
1. a kind of Intelligent Dynamic blendes together reactive compensation system, for carrying out reactive-load compensation regulation to electrical network it is characterised in that this benefit
The system of repaying comprises main circuit and controller, and described main circuit comprises to compensate branch road, and described compensation branch road comprises SVC and compensates branch road
Compensate branch road with SVG, described SVC compensates branch road and SVG compensates branch circuit parallel connection and accesses described electrical network, and described electrical network is connected with other
Load；
Wherein, described SVC compensates branch road, is connected with controller, comprises SVC current sampling circuit, switching control unit and electricity
Container compensates branch road, and described SVC current sampling circuit gathers the electric current that SVC compensates branch road, and by current sampling signal transmit to
Controller, described switching control unit receives the switching signal that controller sends, and controls the switching of capacitor compensation branch road；Described
Capacitor compensation branch road is the compensation branch road being made up of the capacitor of several trianglees or star-like connection；
Described SVG compensates branch road, is connected with controller, comprises SVG current sampling circuit, inverter circuit, described SVG electric current is adopted
Sample circuit gathers the electric current that SVG compensates branch road, and current sampling signal is transmitted to controller, and described inverter circuit is with electric capacity
For the three-phase inverter bridge circuit of DC side energy-storage travelling wave tube, and it is connected to the grid by current-limiting reactor, send out for receiving controller
The pwm pulse control signal going out, and send the reactive current of controllable precise；
Described controller, is connected with electrical network, gathers power network current and line voltage, and by controlling, SVC compensates branch road and SVG compensates
Branch road, implements reactive-load compensation to electrical network；
Described controller control SVC compensates branch road and the step of SVG compensation branch road is：Controller first gathers the electrical network electricity of electrical network
Pressure, power network current, calculate the current reactive power of electrical network, idle control targe value set in advance is zero, according to default mesh
The difference of the scale value reactive power current with electrical network, compensates branch road to SVG first and sends pwm pulse control signal so as to send
The reactive current of controllable precise, compensates branch road then to SVC and sends switching signal, control the switching action of switching control unit,
Thus implement reactive-load compensation；
Described controller comprises voltage transformer, current transformer, sample circuit, signal conditioning circuit, A/D change-over circuit, master
Control CPU, PWM drive circuit, PWM triggers circuit and I/O port digital output circuit, described voltage transformer summation current transformer connects institute
State electrical network, the signal input signal conditioning circuit that voltage transformer, current transformer are collected by described sample circuit, signal is adjusted
The signal handled well is inputted to master cpu after A/D change-over circuit by reason circuit, and master cpu generates pwm pulse instruction and switching
Control signal, pwm pulse instruction sends corresponding pwm pulse control signal to described through PWM drive circuit, PWM triggers circuit
To drive SVG to compensate branch road work, switching control signal compensates system through I/O port digital output circuit to described to the main circuit of compensation system
The main circuit of system compensates branch road work to drive SVC；
Described controller also includes phase-locked loop circuit, over-current detection circuit, over-voltage detection circuit, PWM fault feedback circuit and leads to
News CPU, wherein：Described phase-locked loop circuit, is connected with signal conditioning circuit, the voltage signal that signal conditioning circuit is handled well
Enter horizontal lock, and result is delivered to master cpu；Described over-current detection circuit, is connected with signal conditioning circuit, and signal is adjusted
The good Intelligent Dynamic of reason processing of circuit blendes together reactive compensation system side electric current and carries out real-time detection, when overcurrent is detected, directly
Connect locking PWM drive circuit, and fault-signal is fed back to master cpu；Described over-voltage detection circuit, with signal conditioning circuit phase
Connect, the DC capacitor voltage that signal conditioning circuit is handled well carries out real-time detection, when overvoltage is detected, direct locking
PWM drive circuit, and fault-signal is fed back to master cpu；Described PWM fault feedback circuit, is connected with main circuit, will be from
The IGBT fault-signal that main circuit obtains is sent to PWM drive circuit, and this fault-signal is fed back to master control by PWM drive circuit again
CPU；Described communication CPU, carries out two-way data interaction with master cpu by dual port RAM circuit；Described communication CPU is also connected with
There is data access circuitry, communication CPU writes data into and carries out data storage in data access circuitry, during controller power-off restarting again
Read out data；Communication CPU is connected with Ethernet communication circuit, RS-232 communicating circuit, RS-485 communicating circuit, RS-485
Carry out data interaction in the form of message between the man machine interface that communicating circuit and Intelligent Dynamic blend together outside reactive compensation system.
2. Intelligent Dynamic according to claim 1 blendes together reactive compensation system it is characterised in that described SVC current sample
Circuit gathers, by Hall element, the electric current that SVC compensates branch road, and described SVG current sampling circuit is gathered by Hall element
SVG compensates the electric current of branch road.
3. the Intelligent Dynamic described in a kind of any one based on claim 1～2 blendes together the control method of reactive compensation system, its
It is characterised by, methods described comprises the steps of：
Step 1, controller gather the line voltage of electrical network, power network current from electrical network, calculate the current reactive power of electrical network
QSYS,
Step 2, first, with QSYSRepresent power system reactive power, QSVG volumeRepresent that SVG compensates the nominal reactive compensation capacity of branch road,
QSVGRepresent that SVG compensates the reactive power that branch road compensates, QSVC throws limitRepresent that SVC compensates branch road and puts into reactive power input during electric capacity
Thresholding arranges value, QSVC cuts limitRepresent that SVC compensates reactive power excision thresholding arranges value during branch road excision electric capacity, M represents that SVC mends
Repay the capacitor bank number of branch road input, N represents that SVC compensates the capacitor bank number that branch road does not put into, UVoltageRepresent line voltage,
ULower limitRepresent the minima of normal voltage, UThe upper limitRepresent the maximum of normal voltage；Then, the electrical network being obtained according to real-time detection is no
Work(power QSYS, when | QSYS|>When 0, judge that SVG compensates the reactive power numerical value that branch road need to compensate | QSVGQSYS| whether exceed SVG
Compensate the nominal reactive compensation capacity of branch road | QSVG volume|, if exceeded, the reactive power that SVG compensates branch road compensation is equal to | QSVG volume
| or | QSVG volume|, if without departing from the reactive power that SVG compensates branch road compensation is equal to QSVGQSYS, controller by this SVG compensate
Road needs the signal compensating how many reactive powers to be sent to SVG compensation branch road, makes SVG compensate branch road execution reactive-load compensation；
After step 3, SVG compensate branch road execution reactive-load compensation, controller is to line voltage UVoltageJudged：If ULower limit<UVoltage<
UThe upper limitBe false, and if SVC compensate branch road and put into dry condenser, excise and all put into capacitor；If ULower limit<UVoltage<
UThe upper limitSet up, then carry out the judgement that SVC compensates branch road whether switching capacitance；If the actual reactive power Q of electrical networkSYSQSVGIt is more than
QSVC throws limit, and this state continue for certain time, then and in the case that capacitor does not all put into, SVC compensates branch road and will put into
One group capacitor；If QSYSQSVGLess than QSVC cuts limit, and this state continue for certain time, then all not cutting in capacitor
In the case of removing, SVC compensates branch road and will excise a group capacitor.
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| CN104466987B (en) * | 2014-12-18 | 2017-01-25 | 江苏方程电力科技有限公司 | Novel intelligent dynamic hybrid reactive power compensation device |
| CN104617587B (en) * | 2015-03-05 | 2017-01-25 | 东南大学 | SVG and SVC coordinated control method based on reactive power fluctuation frequency division |
| CN105162139B (en) * | 2015-09-15 | 2017-03-22 | 湖南大学 | Complex optimal control method for reactive power of wind power system in grid voltage sag fault |
| CN106208098B (en) * | 2016-07-25 | 2017-08-25 | 国网湖南省电力公司 | A kind of SVG and fixed reactive-load compensation equipment control method for coordinating and system |
| CN107221938B (en) * | 2017-05-26 | 2024-10-25 | 浙江晟泰电气有限公司 | Hybrid compensation method |
| CN107834568A (en) * | 2017-11-13 | 2018-03-23 | 国网江苏省电力公司苏州供电公司 | Dynamic compensation method and dynamic compensation generating means |
| CN107968414A (en) * | 2018-01-02 | 2018-04-27 | 马鞍山佳夫尼电气科技有限公司 | A kind of intelligence SVG dynamic passive compensation systems |
| CN109361222A (en) * | 2018-09-14 | 2019-02-19 | 江苏斯菲尔电气股份有限公司 | Hybrid reactive compensation control system |
| CN112821414B (en) * | 2021-01-07 | 2023-04-28 | 山东华天电气有限公司 | Mining water-cooling dynamic reactive compensation adjusting device and control method thereof |
| CN114336659A (en) * | 2021-06-29 | 2022-04-12 | 浙江南德电力设备制造有限公司 | Low-voltage hybrid dynamic reactive power compensation device and control method |
| CN114792982B (en) * | 2022-06-21 | 2022-09-06 | 新风光电子科技股份有限公司 | Reactive power compensation system coordination control method based on MCR and SVG |
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| CN102684203B (en) * | 2012-04-24 | 2014-07-09 | 安徽华祝电气技术有限公司 | Method for carrying out intelligent control on dynamic reactive power compensation of SVG (TSC) (static var generator (thyristor switched capacitor)) |
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