CN109659950A - Become the powerless control system and method for the voltage source converter of lower voltage limit - Google Patents
Become the powerless control system and method for the voltage source converter of lower voltage limit Download PDFInfo
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- CN109659950A CN109659950A CN201811641416.6A CN201811641416A CN109659950A CN 109659950 A CN109659950 A CN 109659950A CN 201811641416 A CN201811641416 A CN 201811641416A CN 109659950 A CN109659950 A CN 109659950A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
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Abstract
The invention discloses the powerless control systems and method of a kind of voltage source converter for becoming lower voltage limit, method includes the following steps: first carrying out the control of change lower voltage limit to the exchange side of voltage source converter and obtaining the first output current value, the exchange side of voltage source converter is carried out determining Reactive Power Control and obtains the second output current value, and the exchange side of voltage source converter is carried out determining upper limit voltage control and obtains third output current value；Select in the second output current value and third output current value lesser current value as the first reference current value, first reference current value and the first output current value are compared, reactive current reference value of the biggish current value as voltage source converter in the first reference current value and the first output current value is selected.The present invention can effectively inhibit the fluctuation of alternating voltage, improve the operation stability for the AC network being connected with voltage source converter.
Description
Technical field
The present invention relates to technical field of power systems, and in particular to it is a kind of become lower voltage limit voltage source converter it is idle
Control system and method.
Background technique
Voltage source converter type high voltage direct current (voltage source converter-high voltage direct
Current, VSC-HVDC) transmission of electricity be HVDC Transmission Technology of new generation, have excellent operation characteristic.Chongqing Hubei Province flexible direct current leans against
Back networking project is the engineering of first 500kV flexible direct current networking, and total transmission power 5000MW is our times voltage class
The maximum flexible DC transmission engineering of highest, transmission capacity.After the engineering puts into operation, a plurality of extra-high voltage direct-current is same inside Sichuan Electric Power Network
When commutation failure to China in North China Power Telecommunication Network impact threat relieve, but Hubei grid transferring electricity from the west to the east channel trend increase, will add
Weight Three Gorges near region trend evacuates pressure；Meanwhile Hubei grid becomes asynchronous contact with Chongqing electricity grid from synchronous contact, weakens lake
The electrical link of nortel net and external electrical network is equivalent to the overall rotary inertia decline of Central China Dong Sisheng.
It, need to be to voltage source converter (voltage to guarantee to send the safe and stable operation of receiving end power grid after the engineering puts into operation
Source converter) the idle good control of carry out, to reduce the wave of inverter alternating voltage during grid disturbance
It is dynamic, ensure that inverter operates normally.But existing powerless control method, control effect is poor, can not effectively inhibit alternating voltage
Fluctuation, and easily cause voltage source converter overcurrent.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of idle control systems of the voltage source converter of time variant voltage lower limit
System and method can be improved the ability that voltage source converter resists grid ac voltage fluctuation, effectively inhibit the wave of alternating voltage
It is dynamic, and voltage source converter overcurrent is avoided, improve the operation stability of the power grid of electrification Source Con-verters.
In order to solve the above technical problem, the present invention provides technical solution it is as follows:
A kind of powerless control method for the voltage source converter becoming lower voltage limit, this method comprises:
The control of change lower voltage limit is carried out to the exchange side of voltage source converter and obtains the first output current value, to voltage source
The exchange side of inverter determine Reactive Power Control and obtain the second output current value, and the exchange to voltage source converter
Side determine upper limit voltage control and obtain third output current value；
Select in the second output current value and third output current value lesser current value as the first reference current value, then
First reference current value and the first output current value are compared, the first reference current value and the first output electric current are selected
Reactive current reference value of the biggish current value as voltage source converter in value.
In a wherein embodiment, the exchange side to voltage source converter become lower voltage limit control and obtain
Obtain the first output current value, comprising:
Determine voltage lower control limit reference value；
Calculate the bus real-time voltage measured value that the voltage lower control limit reference value exchanges side with voltage source converter
The difference of per unit value；
The difference is converted using the first proportional integration PI controller, obtains first output current value.
In a wherein embodiment, the determining voltage lower control limit reference value, comprising:
By the per unit value and wattful power messurement value of the busbar voltage default lower limit reference value of voltage source converter exchange side
Per unit value be compared, select in the per unit value of voltage default lower limit reference value and the per unit value of wattful power messurement value
The larger value as voltage lower control limit reference value.
In a wherein embodiment, the exchange side of voltage source converter is carried out determining Reactive Power Control and obtains
The method of two output current values are as follows:
Calculate the per unit value and reactive power power measurement of the bus reactive power reference qref of voltage source converter exchange side
The difference of the per unit value of value, and the difference is converted through the second proportional integration PI controller, obtain second output current value.
In a wherein embodiment, determine upper limit voltage control to the exchange side of voltage source converter and obtain the
The method of three output current values are as follows:
Calculate the per unit value and real-time voltage measured value of the bus voltage upper limit reference value of voltage source converter exchange side
The difference of per unit value, and the difference is converted with third proportional integration PI controller, obtain the third output current value.
A kind of powerless control system for the voltage source converter becoming lower voltage limit, comprising:
First control module, carries out becoming lower voltage limit control for the exchange side to voltage source converter and acquisition first is defeated
Current value out；
Second control module, carries out determining Reactive Power Control for the exchange side to voltage source converter and to obtain second defeated
Current value out；
Third control module is used for and determine upper limit voltage control to the exchange side of voltage source converter and obtain the
Three output current values；
First comparator for comparing the second output current value and third output current value, and exports the second output electric current
Lesser current value is as the first reference current value in value and third output current value；
Second comparator for comparing the first reference current value and the first output current value, and exports the first reference current
Reactive current reference value of the biggish current value as voltage source converter in value and the first output current value.
In a wherein embodiment, first control module includes determination unit, the first computing unit and first
Proportional integration PI controller；
Determination unit, for determining voltage lower control limit reference value；
First computing unit exchanges the bus of side for calculating the voltage lower control limit reference value with voltage source converter
The difference of the per unit value of real-time voltage measured value；
First proportional integration PI controller for converting to the calculated difference of the first computing unit, and obtains
Obtain first output current value.
In a wherein embodiment, the determination unit includes:
Comparing subunit, for by voltage source converter exchange side busbar voltage default lower limit reference value per unit value and
The per unit value of wattful power messurement value is compared；
Subelement is determined, for selecting the per unit value of the voltage default lower limit reference value and the mark of wattful power messurement value
The larger value in value is as voltage lower control limit reference value.
In a wherein embodiment, second control module includes:
Second computing unit, for calculate voltage source converter exchange side bus reactive power reference qref per unit value and
The difference of the per unit value of reactive power power measurement values；
Second proportional integration PI controller is obtained for converting to the calculated difference of the second computing unit
Second output current value.
In a wherein embodiment, third control module includes:
Third computing unit, for calculate voltage source converter exchange side bus voltage upper limit reference value per unit value and
The difference of the per unit value of real-time voltage measured value；
Third proportional integration PI controller is obtained for converting to the calculated difference of third computing unit
The third output current value.
The invention has the following advantages:
The powerless control system and method for the voltage source converter of time variant voltage lower limit of the invention pass through time variant voltage lower limit control
System, the cooperation determined Reactive Power Control and determine upper limit voltage control mode, can play the nothing of voltage source converter to greatest extent
Function regulating power inhibits AC voltage fluctuations, ensures the safety of voltage source converter and power grid, is in particular in following aspect:
(1) in operating normally, inverter can determine reactive power operation, reserve the Reactive-power control of inverter with a small amount of idle
Allowance resisting risk；
(2) after AC network fault disturbance, automatic Transition to constant voltage control mode, using the reactive capability of inverter,
Voltage fluctuation is limited on specified limit value；And the switching between different control functions is continuously, will not to generate idle
Jump；
(3) in the whole service period, by working voltage lower limit with it is active corresponding, avoid overcurrent as far as possible.
Detailed description of the invention
Fig. 1 is the schematic illustration of powerless control method of the invention；
Fig. 2 is the simulation curve figure that dragon's fountain station Chongqing side alternating voltage is controlled in the way of transient voltage；
Fig. 3 is to utilize the transient voltage control mode control dragon's fountain station Chongqing idle simulation curve figure in side；
Fig. 4 is to utilize the voltage dead band control mode control dragon's fountain station Chongqing idle simulation curve figure in side；
Fig. 5 is to utilize powerless control method control dragon's fountain station Chongqing side alternating voltage simulation curve figure of the invention；
Fig. 6 is to utilize the powerless control method control dragon's fountain station Chongqing idle simulation curve figure in side of the invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, present embodiment discloses a kind of powerless control method of voltage source converter for becoming lower voltage limit, it should
Method includes:
The control of change lower voltage limit is carried out to the exchange side of voltage source converter (VSC inverter) and obtains the first output electric current
Value carries out determining Reactive Power Control and obtains the second output current value to the exchange side of voltage source converter, and to voltage source
The exchange side of inverter determine upper limit voltage control and obtain third output current value；
Select in the second output current value and third output current value lesser current value as the first reference current value, then
First reference current value and the first output current value are compared, selected in the first reference current value and the first output current value
Reactive current reference value I of the biggish current value as voltage source converterqref。
The quadrature axis current of voltage source converter can be effectively controlled by above-mentioned idle control process, to effectively prevent handing over
The fluctuation of galvanic electricity pressure.
Wherein, in Fig. 1, Uacrefl0The per unit value of lower limit reference value is defaulted for voltage, P is the mark of wattful power messurement value
Value, UacFor the per unit value (namely per unit value of the ac bus voltage of real-time measurement) of real-time voltage measured value, Kp1、Kp3For
The proportionality coefficient of PI control, Ki1、Ki3For the integral amplification factor of PI control, Iq1max、Iq2max、Iq3maxFor the PI output controlled
Upper clipping electric current, Iq1min、Iq2min、Iq3minFor the lower clipping electric current of the output of PI control, QrefFor the mark of reactive power reference qref
Value, Q are the per unit value (namely per unit value of the reactive power of real-time measurement) of reactive power power measurement values, UacrefhFor electricity
Press the per unit value of upper limit reference value, IqrefFor reactive current reference value (namely the inner ring current control of VSC inverter quadrature axis electricity
Flow reference value).
In a wherein embodiment, become the method for lower voltage limit control are as follows:
By the per unit value U of the busbar voltage default lower limit reference value of voltage source converter exchange sideacrefl0And active power
The per unit value P of measured value is compared, and selects the per unit value U of voltage default lower limit reference valueacrefl0With wattful power messurement value
Per unit value P in the larger value as voltage lower control limit reference value, also even Uacrefl0Greater than P, then U is selectedacrefl0As electricity
Voltage-controlled lower limit reference value processed, if Uacrefl0Less than P, then select P as voltage lower control limit reference value；
After determining voltage lower control limit reference value, also calculating voltage lower control limit reference value is exchanged with voltage source converter
The per unit value U of the bus real-time voltage measured value of sideacDifference, recycle the first PI controller (proportional
Integral controller, pi controller) difference is converted, such as using the first PI controller to difference
It is worth carry out ratio, integral element and amplitude limit link processing, to obtain the first output current value.
Voltage source can be controlled when the busbar voltage that voltage source converter exchanges side is lower by becoming lower voltage limit control method
Inverter exchanges the lower limit of the busbar voltage of side, by comparing Uacref0With the size of P and select the greater in the two and determine
Voltage lower control limit reference value, rather than a directly default fixed value is used as control voltage reference value, so that busbar voltage
Lower limit can change, so as to the valve end voltage for the converter valve being effectively ensured in voltage source converter, thus effectively anti-
Only the electric current of converter valve is out-of-limit, to guarantee the stability of ac grid voltage.
In a wherein embodiment, the method for Reactive Power Control is determined are as follows:
Calculate the per unit value Q of the bus reactive power reference qref of voltage source converter exchange siderefIt is surveyed with reactive power power
The difference of the per unit value Q of magnitude, and the difference is converted through the 2nd PI controller, for example, using the 2nd PI controller to difference into
Row ratio, integral element and amplitude limit link processing, gained is the second output current value.
Wherein, QrefValue can use " 0 ", reactive power power Q is adjusted to 0 by PID controller, guarantees voltage source converter
It is 0 that the exchange of device and AC network is idle, to avoid idle Long Distant Transmit, reserves dynamic reactive regulating power.
Wherein, the per unit value Q of reactive power reference qrefrefFor preassigned value.
In a wherein embodiment, the method for upper limit voltage control is determined are as follows:
Calculate the per unit value U of the bus voltage upper limit reference value of voltage source converter exchange sideacrefhIt is measured with real-time voltage
The per unit value U of valueacDifference, and the difference is converted with the 3rd PI controller, such as using the 3rd PI controller to difference
It is worth carry out ratio, integral element and amplitude limit link processing, i.e. acquisition third output current value.
Wherein, the per unit value U of upper voltage limit reference valueacrefhFor preassigned value.
Determine the method for upper limit voltage control, can be when the busbar voltage that voltage source converter exchanges side be higher, control electricity
Source Con-verters exchange the upper limit of the busbar voltage of side, guarantee the stability of busbar voltage, play the idle of flexible DC transmission
Regulatory function helps AC network burning voltage.
The control principle of the powerless control method of the voltage source converter of the present embodiment is as follows:
When the grid voltage is normal, final output electric current IqrefEqual to the second output electric current, nothing is determined in entire controller presentation
Function power control status, i.e. IqrefFunction be in response to the per unit value Q of voltage source converter reactive power reference qrefrefWith it is real-time
Deviation between the per unit value Q of wattless power measurement value keeps voltage source converter output idle to target value QrefIt draws close.Usually
It can be by the per unit value Q of reactive power reference qrefrefIt is placed in proximity to 0, higher reactive capability nargin is reserved, to improve voltage
Source inverter resists the ability of AC voltage fluctuations.
When alternating voltage is excessively high, final output electric current IqrefElectric current is exported equal to third, the upper limit is determined in entire controller presentation
Voltage state of a control, i.e. IqrefFunction be in response to the per unit value U of voltage source converter upper voltage limit reference valueacrefhWith it is real-time
The per unit value U of voltage measuring valueacBetween deviation, make inverter alternating voltage to target value UacrefhIt draws close, inverter is avoided to hand over
Flow overtension.In practical application, usually by UacrefhIt is set as allowing higher voltage value, such as 1.08 in normal operation, it can
Protect inverter not damaged by overvoltage, and inverter will not be made often in determining upper limit voltage state of a control, long-term output compared with
More inductive reactive powers reduce reactive capability nargin, improve the ability for resisting high voltage risk.
When alternating voltage is too low, final output electric current IqrefEqual to the first output electric current, entire controller, which is presented, becomes lower limit
Voltage state of a control, i.e. IqrefFunction be in response to voltage source converter alternating voltage lower control limit reference value and real-time voltage and survey
The per unit value U of magnitudeacBetween deviation, draw close inverter alternating voltage to alternating voltage lower control limit, inverter avoided to hand over
Brownout is flowed, while avoiding inverter overcurrent.Since current high-voltage large-capacity voltage source converter valve is expensive, it is
It reduces investment outlay, current margins are very low, do not allow the overcurrent long period.Under mark system, P=UI, to avoid electric current I from being more than
1p.u., the per unit value of voltage should be not less than the per unit value of active power, and here it is using active power per unit value P as lower limit
The reason of baseline of voltage reference value.In practical application, usually by the per unit value U of busbar voltage default lower limit reference valueacrefl0
It is set as allowing lower voltage value, such as 0.95 in normal operation, has not only been avoided that inverter under-voltage, but also inverter will not be made to pass through
Often in voltage limit state of a control is fixed, more capacitive reactive power is exported for a long time, reduces reactive capability nargin, and low-voltage is resisted in raising
The ability of risk.
Realize final output electric current IqrefDesirably carrying out conversion between the first, second, third output electric current is function
The task of 2 comparators (i.e. MIN comparator and MAX comparator) on the right side of energy block diagram.
Three branches, which are from top to bottom followed successively by, in Fig. 1 becomes lower voltage limit controlling brancher, determines Reactive Power Control branch and determine
Upper limit voltage controlling brancher.When alternating voltage is normal, voltage source converter output is idle close to target value, and the second output electric current connects
Nearly 0.At this point, the input for determining the 3rd PI controller of upper limit voltage controlling brancher is that (input value of the 3rd PI controller is positive value
UacrefhAnd UacDifference).If the state has continued for some time, under the action of the 3rd PI controller, upper limit voltage control is determined
The upper limit of output meeting up to the 3rd PI controller of 3rd PI controller of branch, i.e. third output electric current are equal to Iq3max, should
Value is greater than the 0 of the second output electric current, so, it is still the 0 of the second output electric current what is after min comparator, obtained.It is same with this
When, become the input of the first PI controller of lower voltage limit controlling brancher as negative value, under the continuous action of its integrator, first is exported
Electric current is equal to the lower limit I of its first PI controllerq1min.And Iq1minA usually value less than 0, the value ratio min comparator
It is small to export 0 value, by max comparator, final output electric current is still 0 value of the second output electric current.
When alternating voltage is excessively high, the input of the 3rd PI controller of constant voltage upper limit controlling brancher becomes negative value, through third
PI controller is accumulative, and third output electric current is gradually reduced, until becoming less than 0 and gradually to the lower limit of its 3rd PI controller
Iq3minIt draws close.Initial stage in the process, fixed idle controlling brancher still work, practical idle close to target value Qref, second is defeated
Electric current maintains near 0 out.When third output electric current is lower than the second output electric current, the output of min comparator is third output electricity
The value of stream.At the same time, become lower voltage limit controlling brancher because input is smaller, output is permanently affixed to lower limit Iq1min.Max compares
What device compared is actually third output electric current and the first output electric current.It is commonly designed and allows Iq1min=Iq3min, Iq1max=Iq3max,
That is final output electric current IqrefIt can be third output electric current, it is meant that constant voltage upper limit control at this time is worked, control effect
It is that reduction voltage source converter is idle, alternating voltage is pulled to the per unit value U of alternating voltage upper limit reference valueacrefh, avoid the occurrence of
Overvoltage.Since second and third output electric current min comparator compares, the electric current after synthesis exports electric current not higher than third, i.e.,
The effect of idle control subtracts idle ability not less than third output electric current.
Excessively high similar with alternating voltage when alternating voltage is too low, occurs the case where, final first output electric current works,
Control effect is that increase inverter is idle, and alternating voltage is pulled to lower limit, avoids under-voltage.With Hubei Province flexible HVDC transmission system that changes
For, as shown in Fig. 2, when controlling dragon's fountain station Chongqing side alternating voltage using transient voltage mode, since after failure 2.6 seconds,
Alternating voltage vibrates back and forth between 0.845pu to 0.92pu；When voltage is lower than 0.85pu, investment transient voltage is controlled, and moment is defeated
It is higher idle out, it is lifted voltage；When voltage is higher than 0.9pu, transient voltage control is exited, reduces idle output, under alternating voltage
Drop.It constantly puts into, exit as transient voltage controls, alternating voltage vibrates back and forth therewith, and as shown in Figure 3, using which
When, dragon's fountain station is changed, and side is idle also to there is oscillatory occurences back and forth.When using other control methods, as shown in figure 4, using dead zone function
Mode control dragon's fountain station Chongqing side alternating voltage and it is idle when, since dead zone is smaller, after failure control target it is higher, it is idle output compared with
Greatly.And when the powerless control method of the voltage source converter of the time variant voltage lower limit using the present embodiment, as shown in Fig. 5-Fig. 6,
The lower voltage limit for becoming the control of lower limit alternating voltage deviation due to active less than 0.83pu, after failure is given lower deviation 0.9pu,
Controller can export appropriate idle, and alternating voltage is near given lower limit after maintaining failure, and there is no oscillations, effectively subtracts
The light pressure of converter valve, preferably ensure that the stability of operation of power networks.
The present embodiment also discloses a kind of powerless control system of voltage source converter for becoming lower voltage limit, comprising:
First control module, carries out becoming lower voltage limit control for the exchange side to voltage source converter and acquisition first is defeated
Current value out；
Second control module, carries out determining Reactive Power Control for the exchange side to voltage source converter and to obtain second defeated
Current value out；
Third control module is used for and determine upper limit voltage control to the exchange side of voltage source converter and obtain the
Three output current values；
First comparator namely above-mentioned min comparator, for comparing the second output current value and third output current value,
And lesser current value is exported in the second output current value and third output current value as the first reference current value；
The max comparator on right side in second comparator namely Fig. 1, for comparing the first reference current value and the first output
Current value, and export nothing of the biggish current value as voltage source converter in the first reference current value and the first output current value
Function current reference value.
In a wherein embodiment, the first control module includes determination unit, the first computing unit and the first ratio
Integral PI controller namely the first PI controller；
Determination unit, for determining voltage lower control limit reference value；
First computing unit, the bus that side is exchanged for calculating voltage lower control limit reference value with voltage source converter are real-time
The per unit value U of voltage measuring valueacDifference；
First PI controller, for converting to the calculated difference of the first computing unit, and it is defeated to obtain described first
Current value out.
Further, it is determined that unit includes:
The max comparator in left side in comparing subunit namely Fig. 1, for by the bus electricity of voltage source converter exchange side
The per unit value U of pressure default lower limit reference valueacrefl0It is compared with the per unit value of wattful power messurement value P；
Subelement is determined, for selecting the per unit value U of voltage default lower limit reference valueacrefl0With wattful power messurement value
The larger value in per unit value P is as voltage lower control limit reference value.
In a wherein embodiment, the second control module includes:
Second computing unit, the per unit value of the bus reactive power reference qref for calculating voltage source converter exchange side
QrefWith the difference of the per unit value Q of reactive power power measurement values；
Second proportional integration PI controller namely the 2nd PI controller, for the calculated difference of the second computing unit
It is converted, obtains above-mentioned second output current value.
In a wherein embodiment, third control module includes:
Third computing unit, the per unit value of the bus voltage upper limit reference value for calculating voltage source converter exchange side
UacrefhWith the per unit value U of real-time voltage measured valueacDifference；
Third proportional integration PI controller namely the 3rd PI controller, for the calculated difference of third computing unit
It is converted, obtains above-mentioned third output current value.
The powerless control method and control system of the voltage source converter of the present embodiment can be realized automatically from reactive power
To the transformation for determining alternating voltage, there is the ability for resisting AC voltage fluctuations；And the switching between different control functions is to connect
Continuous, idle jump will not be generated；It can be realized overcurrent inhibition, improve the protection to converter valve.
The powerless control method and control system of the voltage source converter of the present embodiment, also help voltage source converter
And it closes between other equipment for adjusting network voltages and coordinates.For example, the reactive compensation dress that inverter nearby has constant voltage to control
It sets, it is intended to by the ac bus voltage closed on control in the range of being lower than U1 and being higher than U2.As long as the parameter of this control is arranged,
Uacrefh> U1, Uacrefl0< U2, it is ensured that first starting pressure regulation by the reactive power compensator closed on when voltage fluctuation.When these
Compensation device ability is used up, and voltage continues to deviate, and reaches the upper lower limit value of this control setting, voltage source converter is just from determining nothing
Function state of a control detaches, and carries out voltage adjusting.In this way, voltage source converter and the voltage adjusting device closed on can by different level,
Alternating voltage control is sequentially carried out, realizes cooperation between the two.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to claims.
Claims (10)
1. a kind of powerless control method for the voltage source converter for becoming lower voltage limit, characterized in that this method comprises:
The control of change lower voltage limit is carried out to the exchange side of voltage source converter and obtains the first output current value, to voltage source converter
The exchange side of device determine Reactive Power Control and obtain the second output current value, and to the exchange side of voltage source converter into
Row determines upper limit voltage control and obtains third output current value；
Select in the second output current value and third output current value lesser current value as the first reference current value, then by institute
It states the first reference current value and the first output current value is compared, select in the first reference current value and the first output current value
Reactive current reference value of the biggish current value as voltage source converter.
2. becoming the powerless control method of the voltage source converter of lower voltage limit as described in claim 1, characterized in that described right
The exchange side of voltage source converter become lower voltage limit control and obtain the first output current value, comprising:
Determine voltage lower control limit reference value；
Calculate the mark that the voltage lower control limit reference value exchanges the bus real-time voltage measured value of side with voltage source converter
The difference of value；
The difference is converted using the first proportional integration PI controller, obtains first output current value.
3. becoming the powerless control method of the voltage source converter of lower voltage limit as described in claim 1, characterized in that described true
Constant voltage lower control limit reference value, comprising:
By the mark of the per unit value of the busbar voltage default lower limit reference value of voltage source converter exchange side and wattful power messurement value
Value is compared, select in the per unit value of voltage default lower limit reference value and the per unit value of wattful power messurement value compared with
Big value is used as voltage lower control limit reference value.
4. becoming the powerless control method of the voltage source converter of lower voltage limit as described in claim 1, characterized in that voltage
The exchange side of source inverter carries out determining Reactive Power Control and the method that obtains the second output current value are as follows:
Calculate the per unit value and reactive power power measurement values of the bus reactive power reference qref of voltage source converter exchange side
The difference of per unit value, and the difference is converted through the second proportional integration PI controller, obtain second output current value.
5. becoming the powerless control method of the voltage source converter of lower voltage limit as described in claim 1, characterized in that voltage
The exchange side of source inverter carries out determining the method that upper limit voltage controls and obtains third output current value are as follows:
Calculate the per unit value of the bus voltage upper limit reference value of voltage source converter exchange side and the mark of real-time voltage measured value
The difference of value, and the difference is converted with third proportional integration PI controller, obtain the third output current value.
6. a kind of powerless control system for the voltage source converter for becoming lower voltage limit, characterized in that include:
First control module, carries out becoming lower voltage limit control for the exchange side to voltage source converter and the first output of acquisition is electric
Flow valuve；
Second control module carries out determining Reactive Power Control and obtains the second output electricity for the exchange side to voltage source converter
Flow valuve；
Third control module is used for and determine upper limit voltage control to the exchange side of voltage source converter and to obtain third defeated
Current value out；
First comparator, for comparing the second output current value and third output current value, and export the second output current value and
Lesser current value is as the first reference current value in third output current value；
Second comparator, for comparing the first reference current value and the first output current value, and export the first reference current value and
Reactive current reference value of the biggish current value as voltage source converter in first output current value.
7. becoming the powerless control system of the voltage source converter of lower voltage limit as claimed in claim 6, characterized in that described the
One control module includes determination unit, the first computing unit and the first proportional integration PI controller；
Determination unit, for determining voltage lower control limit reference value；
First computing unit, the bus that side is exchanged for calculating the voltage lower control limit reference value with voltage source converter are real-time
The difference of the per unit value of voltage measuring value；
First proportional integration PI controller for converting to the calculated difference of the first computing unit, and obtains institute
State the first output current value.
8. becoming the powerless control system of the voltage source converter of lower voltage limit as claimed in claim 7, characterized in that described true
Order member includes:
Comparing subunit, for by the busbar voltage default per unit value of lower limit reference value of voltage source converter exchange side and active
The per unit value of power measurement values is compared；
Subelement is determined, for selecting the per unit value of the voltage default lower limit reference value and the per unit value of wattful power messurement value
In the larger value as voltage lower control limit reference value.
9. becoming the powerless control system of the voltage source converter of lower voltage limit as claimed in claim 6, characterized in that described the
Two control modules include:
Second computing unit, for calculate voltage source converter exchange side bus reactive power reference qref per unit value and in real time
The difference of the per unit value of wattless power measurement value；
Second proportional integration PI controller, for being converted to the calculated difference of the second computing unit, described in acquisition
Second output current value.
10. becoming the powerless control system of the voltage source converter of lower voltage limit as claimed in claim 6, characterized in that third
Control module includes:
Third computing unit, for calculate voltage source converter exchange side bus voltage upper limit reference value per unit value and in real time
The difference of the per unit value of voltage measuring value；
Third proportional integration PI controller, for being converted to the calculated difference of third computing unit, described in acquisition
Third output current value.
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