CN106546851A - A kind of stable control method and device of MMC converter valve operating tests circuit - Google Patents

A kind of stable control method and device of MMC converter valve operating tests circuit Download PDF

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Publication number
CN106546851A
CN106546851A CN201610935560.5A CN201610935560A CN106546851A CN 106546851 A CN106546851 A CN 106546851A CN 201610935560 A CN201610935560 A CN 201610935560A CN 106546851 A CN106546851 A CN 106546851A
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current
auxiliary voltage
signal
voltage signal
bridge arm
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CN106546851B (en
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杨俊�
王秀环
王高勇
高冲
李跃
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Global Energy Interconnection Research Institute
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

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Abstract

The invention provides the stable control method and device of a kind of MMC converter valve operating tests circuit, methods described includes gathering the circulating current between two bridge arms；The first auxiliary voltage signal is calculated according to circulating current, so as to suppress circulating current to vibrate；The second auxiliary voltage signal is calculated according to circulating current, so as to eliminate two harmonics of circulating current；Using the first auxiliary voltage signal and the second auxiliary voltage signal and as bridge arm bridge arm voltage additional amount, the extra switch signal that impulse modulation obtains the bridge arm is carried out to bridge arm voltage additional amount.Compared with prior art, a kind of stable control method and device of MMC converter valve operating tests circuit that the present invention is provided can suppress circulating current to vibrate and eliminate two harmonics in circulating current, so as to ensure that operation test circuit stability is run.

Description

A kind of stable control method and device of MMC converter valve operating tests circuit
Technical field
The present invention relates to Technology of HVDC based Voltage Source Converter field, and in particular to a kind of MMC converter valve operating tests circuit it is steady Locking control method and device.
Background technology
Modularization multi-level converter (Modular Multi-Level Converter, MMC) is as which is without the need for exchange system The features such as system provides converting commutating current, switching device operating frequency is low, output voltage waveforms are close to sine wave further improves changes The modularization level of stream valve, reduces the manufacture difficulty of converter valve, so as to be widely used in based on voltage source converter Technical field of HVDC transmission (Voltage Sourced Converter based HVDC, VSC-HVDC).
It is in order to the reliability for improving flexible direct current power transmission system needs to carry out MMC converter valves strict type approval test, main Insulation Test to be included, operation test, short circuit current test, IGBT overcurrent shut-off test and electromagnetism interference（EMC）Test Deng campaign project.Wherein, operation test comprising maximum continuous service load test, maximum transient operation overload trial, Minimum direct current voltage test, for checking the circuit of VSC and correlation in valve body, the repeat function of most serious in running status Under the conditions of on-state, when turning on and off state, it is whether suitable for the effect of electric current, voltage and temperature；And prove valve electricity The correctness of the interphase interaction of electronic circuit and VSC valve major loops.
At present, operation test is carried out to MMC converter valves using equivalent test method generally.Fig. 1 is equivalent for MMC converter valves Hookup, as illustrated, the hookup includes two to dragging structure, each can have two or four bridge arm to dragging structure Composition, bridge arm are auxiliary valve or test product valve.The bridge arm to dragging circuit load reactor L0 both sides is adjusted when circuit stability is run Output voltage Ua, Ub so as to for AC and DC superimposed voltage.Fig. 2 shows for the bridge arm alternating voltage waveform of MMC equivalent test circuits Be intended to, Fig. 3 for MMC test product valves voltage/current waveform diagram, as illustrated, due to power-balance hookup each DC feedback power can be formed in bridge arm, dc power is equal in magnitude with AC power, in opposite direction, therefore in MMC test product valves It is middle to form the voltage and current stress that the AC and DC stable with actual operating mode identical is superimposed.
But, the electric capacity of auxiliary valve and test product valve equivalent to series connection in the equivalent test circuit of MMC converter valves, and it is equivalent In hookup, resistance components are less, therefore low-frequency oscillation is easily formed between bridge arm electric capacity and load reactance device, cause equivalent Hookup fluctuation of service；Simultaneously because the fluctuation of bridge arm instantaneous power, causes the electric capacity electricity of the power modules in bridge arm Pressure fluctuation, contains high frequency harmonic components in causing then bridge arm current, high-frequency harmonic electric current forms circulation in circuit, affect etc. The equivalence of effect hookup.
The content of the invention
In order to overcome the defect of prior art, the invention provides a kind of stable control of MMC converter valve operating tests circuit Method and device processed.
In a first aspect, a kind of technical scheme of the stable control method of MMC converter valve operating tests circuit is in the present invention：
The operation test circuit includes two bridge arms in parallel, power submodule of each bridge arm including multiple series connection Block；Methods described includes：
Gather the circulating current between described two bridge arms；
The first auxiliary voltage signal is calculated according to the circulating current, to suppress circulating current to vibrate；According to the circulation Current calculation the second auxiliary voltage signal, to eliminate two harmonics of circulating current；
Will be the first auxiliary voltage signal and the second auxiliary voltage signal and attached as the bridge arm voltage of the bridge arm Dosage, carries out the extra switch signal that impulse modulation obtains the bridge arm to the bridge arm voltage additional amount.
Further, an optimal technical scheme of present invention offer is：Circulation electricity between two bridge arms of the collection Stream is：
The bridge arm current of arbitrary bridge arm in two described bridge arms is gathered by current transformer.
Further, an optimal technical scheme of present invention offer is：It is described to add according to circulating current calculating first Include before voltage signal and the second auxiliary voltage signal：
The first ratio delays time to control is carried out to the circulating current and obtains the first current signal iz_01(s), first ratio Example delays time to control such as following formula（1）It is shown：
Wherein, izS () is circulating current, s is complex variable, T1For delay time.
Further, an optimal technical scheme of present invention offer is：It is described to add according to circulating current calculating first Voltage signal includes：
Second ratio delays time to control is carried out to first current signal and obtains the second current signal；
Ratio control is carried out to second current signal and obtains the first auxiliary voltage signal.
Further, an optimal technical scheme of present invention offer is：
The second ratio delays time to control such as following formula（2）It is shown：
Wherein, iz_01S () is the first current signal, iz_02S () is the second current signal, s is complex variable, T2For during time delay Between；
The ratio control such as following formula（3）It is shown：
Vex1(s)=Rvpiz_02(s) （3）
Wherein, Vex1S () is the first auxiliary voltage signal, RvpFor proportionality coefficient and be constant.
Further, an optimal technical scheme of present invention offer is：It is described to add according to circulating current calculating second Voltage signal includes：
Its current component under rotating coordinate system is obtained after delays time to control is carried out to first current signal；The electric current Component includes d shaft currents component and q shaft current components；
Calculate the deviation of the corresponding current component of reference value of each current component；
Proportional plus integral control and decoupling are carried out to the deviation successively, by the voltage signal obtained after decoupling by rotational coordinates System is changed to rest frame, so as to obtain the second auxiliary voltage signal.
Further, an optimal technical scheme of present invention offer is：The reference value for calculating each current component with Include before the deviation of its corresponding current component：
The reference value of each current component is set to into 0, and then proportional plus integral control reconciliation is carried out to the deviation successively Coupling is eliminating two harmonics of the circulating current.
Further, an optimal technical scheme of present invention offer is：
It is described to carry out proportional plus integral control and the following formula of decoupling successively to the deviation of d shaft current components（4）It is shown：
Wherein, VdS () is the d shaft voltage components of voltage signal obtained after decoupling, IzdS () is d shaft current components, Izd_refThe reference value of (s) for d shaft current components, IzqS () is q shaft current components, kpFor proportionality coefficient, kiFor integral coefficient, s For complex variable, ω0For angular frequency, LsFor the reactance value of bridge arm reactor in the operation test circuit；
It is described to carry out proportional plus integral control and the following formula of decoupling successively to the deviation of q shaft current components（5）It is shown：
Wherein, VqS () is the q shaft voltage components of voltage signal obtained after decoupling, Izq_refS () is q shaft current components Reference value.
Second aspect, in the present invention, a kind of technical scheme of the stabilization control device of MMC converter valve operating tests circuit is：
The operation test circuit includes two bridge arms in parallel, power submodule of each bridge arm including multiple series connection Block；The control device includes：
Current acquisition module, for gathering the circulating current between described two bridge arms；
Auxiliary voltage computing module, for calculating the first auxiliary voltage signal and the second additional electrical according to the circulating current Pressure signal；
Extra switch signal modulation module, for by the sum of the first auxiliary voltage signal and the second auxiliary voltage signal As the bridge arm voltage additional amount of the bridge arm, and impulse modulation is carried out to the bridge arm voltage additional amount obtain the bridge arm Extra switch signal.
Further, an optimal technical scheme of present invention offer is：
The current acquisition module includes current transformer；
The current transformer, for the bridge arm current of collection arbitrary bridge arm in two described bridge arms.
Further, an optimal technical scheme of present invention offer is：The auxiliary voltage computing module includes first Ratio delay controller, the first auxiliary voltage signature computation unit and the second auxiliary voltage signature computation unit；
The first ratio delay controller, obtains the first electric current for the first ratio delays time to control is carried out to circulating current Signal；
The first auxiliary voltage signature computation unit includes the second ratio delay controller and proportional controller：Described Two ratio delay controllers, obtain the second current signal for the second ratio delays time to control is carried out to the first current signal；It is described Proportional controller, obtains the first auxiliary voltage signal for ratio control is carried out to the second current signal；
The second auxiliary voltage signature computation unit includes that the first coordinate transform subelement, the second coordinate transform are single Unit, deviation computation subunit and pi controller：The first coordinate transform subelement, for believing to first electric current Its current component under rotating coordinate system is obtained after number carrying out delays time to control；The deviation computation subunit, it is each for calculating The deviation of the corresponding current component of the reference value of current component；The pi controller, for successively to each deviation Carry out proportional plus integral control and decoupling；The second coordinate transform subelement, for the voltage signal that obtains after decoupling by rotating Coordinate system is changed to rest frame, so as to obtain the second auxiliary voltage signal.
Further, an optimal technical scheme of present invention offer is：
The first ratio delays time to control such as following formula（6）It is shown：
Wherein, iz_01S () is the first current signal, izS () is circulating current, s is complex variable, T1For delay time；
The second ratio delays time to control such as following formula（7）It is shown：
Wherein, iz_02S () is the second current signal, T2For delay time；
Ratio control such as following formula（8）It is shown：
Vex1(s)=Rvpiz_02(s) （8）
Wherein, Vex1S () is the first auxiliary voltage signal, RvpFor proportionality coefficient and be constant；
The pi controller such as following formula（9）It is shown：
Wherein, Vd(s) and VqThe d shaft voltages component and q shaft voltage components of s voltage signal that () is obtained after respectively decoupling, IzdS () is d shaft current components, Izd_refThe reference value of (s) for d shaft current components, IzqS () is q shaft current components, Izq_ref(s) For the reference value of q shaft current components, kpFor proportionality coefficient, kiFor integral coefficient, ω0For angular frequency, LsFor operation test electricity The reactance value of bridge arm reactor in road.
Compared with immediate prior art, the invention has the beneficial effects as follows：
1st, the stable control method of a kind of MMC converter valve operating tests circuit that the present invention is provided, is first depending on operation examination Circulating current in electrical verification road between two bridge arms calculates two auxiliary voltage signals, and circulating current can be suppressed to vibrate and eliminate Two harmonics in circulating current, then using the voltage of the two auxiliary voltage signals and as bridge arm voltage additional amount, most It is modulated the extra switch signal for obtaining bridge arm afterwards to the bridge arm voltage additional amount, arm exports additional electrical in the case where the signal drives Pressure ensures the operation of operation test circuit stability；
2nd, the stabilization control device of a kind of MMC converter valve operating tests circuit that the present invention is provided, auxiliary voltage calculate mould Block can calculate the auxiliary voltage signal of bridge arm according to circulating current, and extra switch signal modulation module is adjusted to auxiliary voltage signal The extra switch signal of bridge arm, bridge arm action under the driving of the extra switch signal can be obtained after system.
Description of the drawings
Fig. 1：The equivalent test circuit diagram of MMC converter valves；
Fig. 2：The bridge arm alternating voltage waveform schematic diagram of MMC equivalent test circuits；
Fig. 3：The voltage/current waveform diagram of MMC test product valves；
Fig. 4：A kind of stable control method implementing procedure figure of MMC converter valve operating tests circuit in the embodiment of the present invention；
Fig. 5：The principle schematic of the stabilization control device of MMC converter valve operating tests circuit in the embodiment of the present invention；
Fig. 6：MMC test product valves current waveform schematic diagram in the embodiment of the present invention；
Fig. 7：Each component waveform schematic diagram in circulating current in the embodiment of the present invention.
Specific embodiment
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely illustrated, it is clear that described embodiment is The a part of embodiment of the present invention, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Accompanying drawing is combined separately below, and a kind of MMC converter valve operating tests circuit provided in an embodiment of the present invention is stablized Control method is illustrated.
Fig. 4 is a kind of stable control method implementing procedure figure of MMC converter valve operating tests circuit in the embodiment of the present invention, As illustrated, the stable control method of MMC converter valve operating tests circuit can be implemented as steps described below in the present embodiment, tool Body is.
Step S101：Circulating current between two bridge arms in parallel of collection operation test circuit.
Step S102：The first auxiliary voltage signal is calculated according to circulating current, so as to suppress circulating current to vibrate；Foundation is followed Circular current calculates the second auxiliary voltage signal, so as to eliminate two harmonics of circulating current.
Step S103：Will be the first auxiliary voltage signal and the second auxiliary voltage signal and as bridge arm bridge arm voltage attached Dosage；The extra switch signal that impulse modulation obtains bridge arm is carried out to bridge arm voltage additional amount.Wherein, extra switch signal refers to It is after each bridge arm of operation test circuit is run under drive signal control, in order that operation test circuit stability is run again To the drive signal that each bridge arm sends, and the first auxiliary voltage signal that step S101 and S102 are respectively obtained and the second additional electrical Component of the pressure signal for bridge arm voltage additional amount.
The circulating current being first depending in the present embodiment in operation test circuit between two bridge arms calculates two additional electricals Pressure signal, can suppress circulating current to vibrate and eliminate two harmonics in circulating current, then by the two auxiliary voltages The voltage of signal and as bridge arm voltage additional amount, is finally modulated to the bridge arm voltage additional amount and obtains the additional of bridge arm and open OFF signal, arm export auxiliary voltage and ensure the operation of operation test circuit stability in the case where the signal drives.
Further, in the present embodiment, step S101 can be implemented as steps described below.
Circulating current in the present embodiment in operation test circuit between two bridge arms and the bridge arm electricity through arbitrary bridge arm Stream is equal, therefore can measure the bridge arm current of any one bridge arm as circulating current using current transformer.Electricity is circulated wherein Stream includes DC component, fundamental component harmony wave component, and harmonic component is mainly two harmonics, in order to ensure operation test electricity Road stable operation needs to eliminate the harmonic component based on two harmonics.
Further, in the present embodiment, the first auxiliary voltage signal of step S102 calculating can be implemented as steps described below.
1st, the first ratio delays time to control is carried out to circulating current and obtains the first current signal iz_01(s)
First ratio delays time to control such as following formula in the present embodiment（1）It is shown：
Wherein, izS () is circulating current, s is complex variable, T1For delay time.
2nd, to the first current signal iz_01S () carries out the second ratio delays time to control and obtains the second current signal iz_02(s)
Second ratio delays time to control such as following formula in the present embodiment（2）It is shown：
Wherein, T2For delay time.
3rd, to the second current signal iz_02S () carries out ratio control and obtains the first auxiliary voltage signal Vex1(s)。
Ratio control such as following formula in the present embodiment（3）It is shown：
Vex1(s)=Rvpiz_02(s) （3）
Wherein, RvpFor proportionality coefficient and be constant.Proportionality coefficient R in the present embodimentvpEquivalent to a virtual resistance, because This can suppress the vibration of circulating current and weaken its two harmonic.
Further, in the present embodiment, the second auxiliary voltage signal of step S102 calculating can be implemented as steps described below.
1st, according to formula（1）The first ratio delays time to control is carried out to circulating current and obtains the first current signal iz_01(s)
2nd, obtain after delays time to control being carried out to the first current signal its current component under rotating coordinate system.
Current component in the present embodiment under rotating coordinate system includes d shaft currents component and q shaft current components.
3rd, the deviation of the corresponding current component of the reference value of each current component of calculating.
The reference value of each current component can be set to 0 when two harmonics is eliminated in the present embodiment, so it is right successively The deviation carries out proportional plus integral control and decoupling to eliminate two harmonics of circulating current.
4th, proportional plus integral control and decoupling are carried out to deviation successively, by the voltage signal obtained after decoupling by rotating coordinate system Change to rest frame, so as to obtain the second auxiliary voltage signal.
（1）Carry out proportional plus integral control and the following formula of decoupling successively to the deviation of d shaft current components（4）It is shown：
Wherein, VdS () is the d shaft voltage components of voltage signal obtained after decoupling, IzdS () is d shaft current components, Izd_refThe reference value of (s) for d shaft current components, IzqS () is q shaft current components, kpFor proportionality coefficient, kiFor integral coefficient, s For complex variable, ω0For angular frequency, LsFor the reactance value of bridge arm reactor in operation test circuit.
（2）Carry out proportional plus integral control and the following formula of decoupling successively to the deviation of q shaft current components（5）It is shown：
Wherein, VqS () is the q shaft voltage components of voltage signal obtained after decoupling, Izq_refS () is q shaft current components Reference value.
Fig. 6 is MMC test product valve current waveform schematic diagrames in the embodiment of the present invention, as illustrated, electricity is circulated in the present embodiment Stream waveform shows that from the beginning of 2s its hunting range is close to -4～4kA, after t=3s carries out ratio control to the first current signal Can significantly inhibit when the first auxiliary voltage signal is calculated afterwards current oscillation make its hunting range be reduced to close -1～ 1kA。
Fig. 7 is each component waveform schematic diagram in circulating current in the embodiment of the present invention, as illustrated, in t=in the present embodiment The first current signal is carried out during 4s circulation electricity after proportional plus integral control, is eliminated when the second auxiliary voltage signal is calculated Two harmonics in stream.
In the present embodiment calculate first voltage additional signal when the equivalent virtual resistance of proportion of utilization controlling unit, so as to press down Current oscillation in operation test circuit processed causes circuit stability to run, the proportion of utilization product when second voltage additional signal is calculated Point controlling unit eliminates two harmonics in circulating current and causes following for operation test circuit and converter valve actual motion circuit Circular current is consistent, and improves the equivalence of operation test circuit.
Present invention also offers a kind of stabilization control device of MMC converter valve operating tests circuit, and be given and be embodied as Example.
In the present embodiment, the stabilization control device of MMC converter valve operating tests circuit can include current acquisition module, attached Making alive computing module and extra switch signal modulation module, wherein：
Current acquisition module, for gathering the circulating current between two bridge arms.
Auxiliary voltage computing module, for calculating the first auxiliary voltage signal and the second auxiliary voltage letter according to circulating current Number.
Extra switch signal modulation module, for using the first auxiliary voltage signal and the second auxiliary voltage signal and as The bridge arm voltage additional amount of bridge arm, and the extra switch signal that impulse modulation obtains bridge arm is carried out to bridge arm voltage additional amount.
In the present embodiment, auxiliary voltage computing module can calculate the auxiliary voltage signal of bridge arm according to circulating current, add Switching signal modulation module to obtaining the extra switch signal of bridge arm after auxiliary voltage signal modulation, additional open at this by bridge arm Action under the driving of OFF signal.
Further, in the present embodiment, current acquisition module can also include following structures.
In the present embodiment, current acquisition module includes current transformer, can be used for gathering two in operation test circuit The bridge arm current of arbitrary bridge arm in individual bridge arm in parallel, and the bridge arm current is sent to auxiliary voltage computing module.
Further, in the present embodiment, auxiliary voltage computing module can also include following structures.
Fig. 5 is the principle schematic of the stabilization control device of MMC converter valve operating test circuits in the embodiment of the present invention, such as Shown in figure, the present embodiment auxiliary voltage computing module includes the first ratio delay controller, the first auxiliary voltage signal of change list Unit and the second attached function making alive signature computation unit.Wherein,
1st, the first ratio delay controller
In the present embodiment, the first ratio delay controller obtains for the first ratio delays time to control is carried out to circulating current One current signal.Wherein, the first ratio delays time to control such as following formula（6）It is shown：
Wherein, iz_01S () is the first current signal, izS () is circulating current, s is complex variable, T1For delay time.
2nd, the first auxiliary voltage signature computation unit includes
In the present embodiment, the first auxiliary voltage signature computation unit includes the second ratio delay controller and proportional controller. Wherein,
（1）Second ratio delay controller
In the present embodiment, the second ratio delay controller is obtained for the second ratio delays time to control is carried out to the first current signal To the second current signal.Wherein, the second ratio delays time to control such as following formula（7）It is shown：
Wherein, iz_02S () is the second current signal, T2For delay time.
（2）Proportional controller
In the present embodiment, proportional controller obtains the first auxiliary voltage letter for ratio control is carried out to the second current signal Number.
Ratio control such as following formula（8）It is shown：
Vex1(s)=Rvpiz_02(s) （8）
Wherein, Vex1S () is the first auxiliary voltage signal, RvpFor proportionality coefficient and be constant.
3rd, the second auxiliary voltage signature computation unit
In the present embodiment, the second auxiliary voltage signature computation unit includes the first coordinate transform subelement, the second coordinate transform Subelement, deviation computation subunit and pi controller.Wherein,
（1）First coordinate transform subelement
In the present embodiment the first coordinate transform subelement for obtain after carrying out delays time to control to the first current signal its Current component under rotating coordinate system.
（2）Deviation computation subunit
The present embodiment large deviations computation subunit is used for the corresponding current component of reference value for calculating each current component Deviation.
（3）Pi controller
In the present embodiment, pi controller is used to carry out proportional plus integral control and decoupling to each deviation successively.Wherein, Pi controller such as following formula（9）It is shown：
Wherein, Vd(s) and VqThe d shaft voltages component and q shaft voltage components of s voltage signal that () is obtained after respectively decoupling, IzdS () is d shaft current components, Izd_refThe reference value of (s) for d shaft current components, IzqS () is q shaft current components, Izq_ref(s) For the reference value of q shaft current components, kpFor proportionality coefficient, kiFor integral coefficient, ω0For angular frequency, LsFor operation test electricity The reactance value of bridge arm reactor in road.
（4）Second coordinate transform subelement
The voltage signal that the second coordinate transform subelement is obtained after being used for decoupling in the present embodiment is changed by rotating coordinate system To rest frame, so as to obtain the second auxiliary voltage signal.
Obviously, those skilled in the art can carry out the essence of various changes and modification without deviating from the present invention to the present invention God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising these changes and modification.

Claims (12)

1. a kind of stable control method of MMC converter valve operating tests circuit, it is characterised in that the operation test circuit includes Two bridge arms in parallel, power modules of each bridge arm including multiple series connection；Methods described includes：
Gather the circulating current between described two bridge arms；
The first auxiliary voltage signal is calculated according to the circulating current, to suppress circulating current to vibrate；According to the circulating current The second auxiliary voltage signal is calculated, to eliminate two harmonics of circulating current；
Using the first auxiliary voltage signal and the second auxiliary voltage signal and as the bridge arm bridge arm voltage additional amount, The extra switch signal that impulse modulation obtains the bridge arm is carried out to the bridge arm voltage additional amount.
2. a kind of stable control method of MMC converter valve operating tests circuit as claimed in claim 1, it is characterised in that institute Stating the circulating current gathered between two bridge arms is：Arbitrary bridge arm in two described bridge arms is gathered by current transformer Bridge arm current.
3. a kind of stable control method of MMC converter valve operating tests circuit as claimed in claim 1, it is characterised in that institute Stating includes before calculating the first auxiliary voltage signal and the second auxiliary voltage signal according to circulating current：
The first ratio delays time to control is carried out to the circulating current and obtains the first current signal iz_01(s), the first ratio time delay Control is as shown in following formula (1)：
i z _ 01 ( s ) = 1 2 ( 1 + e - sT 1 ) i z ( s ) - - - ( 1 )
Wherein, izS () is circulating current, s is complex variable, T1For delay time.
4. a kind of stable control method of MMC converter valve operating tests circuit as claimed in claim 3, it is characterised in that institute Stating includes according to circulating current the first auxiliary voltage signal of calculating：
Second ratio delays time to control is carried out to first current signal and obtains the second current signal；
Ratio control is carried out to second current signal and obtains the first auxiliary voltage signal.
5. a kind of stable control method of MMC converter valve operating tests circuit as claimed in claim 4, it is characterised in that institute State shown in the second ratio delays time to control such as following formula (2)：
i z _ 02 ( s ) = 1 2 ( 1 + e - sT 2 ) i z _ 01 ( s ) - - - ( 2 )
Wherein, iz_01S () is the first current signal, iz_02S () is the second current signal, s is complex variable, T2For delay time；
The ratio control is as shown in following formula (3)：
Vex1(s)=Rvpiz_02(s) (3)
Wherein, Vex1S () is the first auxiliary voltage signal, RvpFor proportionality coefficient and be constant.
6. a kind of stable control method of MMC converter valve operating tests circuit as claimed in claim 3, it is characterised in that institute Stating includes according to circulating current the second auxiliary voltage signal of calculating：
Its current component under rotating coordinate system is obtained after delays time to control is carried out to first current signal；The current component Including d shaft currents component and q shaft current components；
Calculate the deviation of the corresponding current component of reference value of each current component；
Proportional plus integral control and decoupling are carried out to the deviation successively, the voltage signal obtained after decoupling is turned by rotating coordinate system Rest frame is shifted to, so as to obtain the second auxiliary voltage signal.
7. a kind of stable control method of MMC converter valve operating tests circuit as claimed in claim 6, it is characterised in that institute Include before the deviation for stating the corresponding current component of reference value for calculating each current component：
The reference value of each current component is set to into 0, so carry out proportional plus integral control and decoupling successively to the deviation with Eliminate two harmonics of the circulating current.
8. a kind of stable control method of MMC converter valve operating tests circuit as claimed in claim 6, it is characterised in that
It is described successively the deviation of d shaft current components to be carried out shown in proportional plus integral control and the following formula (4) of decoupling：
V d ( s ) = ( I z d _ r e f ( s ) - I z d ( s ) ) × ( k p + k i s ) - I z q ( s ) × 2 ω 0 L s - - - ( 4 )
Wherein, VdS () is the d shaft voltage components of voltage signal obtained after decoupling, IzdS () is d shaft current components, Izd_ref(s) For the reference value of d shaft current components, IzqS () is q shaft current components, kpFor proportionality coefficient, kiFor integral coefficient, s is complex variable, ω0For angular frequency, LsFor the reactance value of bridge arm reactor in the operation test circuit；
It is described successively the deviation of q shaft current components to be carried out shown in proportional plus integral control and the following formula (5) of decoupling：
V q ( s ) = ( I z q _ r e f ( s ) - I z q ( s ) ) × ( k p + k i s ) - I z d ( s ) × 2 ω 0 L s - - - ( 5 )
Wherein, VqS () is the q shaft voltage components of voltage signal obtained after decoupling, Izq_refThe reference of (s) for q shaft current components Value.
9. a kind of stabilization control device of MMC converter valve operating tests circuit, it is characterised in that the operation test circuit includes Two bridge arms in parallel, power modules of each bridge arm including multiple series connection；The control device includes：
Current acquisition module, for gathering the circulating current between described two bridge arms；
Auxiliary voltage computing module, for calculating the first auxiliary voltage signal and the second auxiliary voltage letter according to the circulating current Number；
Extra switch signal modulation module, for using the first auxiliary voltage signal and the second auxiliary voltage signal and as The bridge arm voltage additional amount of the bridge arm, and carry out impulse modulation to the bridge arm voltage additional amount and obtain the bridge arm adding Switching signal.
10. a kind of stabilization control device of MMC converter valve operating tests circuit as claimed in claim 9, it is characterised in that
The current acquisition module includes current transformer；
The current transformer, for the bridge arm current of collection arbitrary bridge arm in two described bridge arms.
A kind of 11. stabilization control devices of MMC converter valve operating tests circuit as claimed in claim 9, it is characterised in that institute Stating auxiliary voltage computing module includes the first ratio delay controller, the first auxiliary voltage signature computation unit and the second additional electrical Pressure signature computation unit；
The first ratio delay controller, obtains the first electric current letter for the first ratio delays time to control is carried out to circulating current Number；
The first auxiliary voltage signature computation unit includes the second ratio delay controller and proportional controller：Second ratio Example delay controller, obtains the second current signal for the second ratio delays time to control is carried out to the first current signal；The ratio Controller, obtains the first auxiliary voltage signal for ratio control is carried out to the second current signal；
The second auxiliary voltage signature computation unit includes the first coordinate transform subelement, the second coordinate transform subelement, partially Difference computation subunit and pi controller：The first coordinate transform subelement, for entering to first current signal Its current component under rotating coordinate system is obtained after line delay control；The deviation computation subunit, for calculating each electric current The deviation of the corresponding current component of the reference value of component；The pi controller, for carrying out to each deviation successively Proportional plus integral control and decoupling；The second coordinate transform subelement, for the voltage signal that obtains after decoupling by rotational coordinates System is changed to rest frame, so as to obtain the second auxiliary voltage signal.
A kind of 12. stabilization control devices of MMC converter valve operating tests circuit as claimed in claim 11, it is characterised in that Shown in the first ratio delays time to control such as following formula (6)：
i z _ 01 ( s ) = 1 2 ( 1 + e - sT 1 ) i z ( s ) - - - ( 6 )
Wherein, iz_01S () is the first current signal, izS () is circulating current, s is complex variable, T1For delay time；
Shown in the second ratio delays time to control such as following formula (7)：
i z _ 02 ( s ) = 1 2 ( 1 + e - sT 2 ) i z _ 01 ( s ) - - - ( 7 )
Wherein, iz_02S () is the second current signal, T2For delay time；
Ratio control is as shown in following formula (8)：
Vex1(s)=Rvpiz_02(s) (8)
Wherein, Vex1S () is the first auxiliary voltage signal, RvpFor proportionality coefficient and be constant；
Shown in the pi controller such as following formula (9)：
V d ( s ) = ( I z d _ r e f ( s ) - I z d ( s ) ) × ( k p + k i s ) - I z q ( s ) × 2 ω 0 L s V q ( s ) = ( I z q _ r e f ( s ) - I z q ( s ) ) × ( k p + k i s ) - I z d ( s ) × 2 ω 0 L s - - - ( 9 )
Wherein, Vd(s) and VqThe d shaft voltages component and q shaft voltage components of s voltage signal that () is obtained after respectively decoupling, Izd S () is d shaft current components, Izd_refThe reference value of (s) for d shaft current components, IzqS () is q shaft current components, Izq_refS () is q The reference value of shaft current component, kpFor proportionality coefficient, kiFor integral coefficient, ω0For angular frequency, LsFor the operation test circuit The reactance value of interior bridge arm reactor.
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