CN108683155B - A kind of converter valve thyristor and capacitance-resistance parameter optimization method and device - Google Patents
A kind of converter valve thyristor and capacitance-resistance parameter optimization method and device Download PDFInfo
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- CN108683155B CN108683155B CN201810345007.5A CN201810345007A CN108683155B CN 108683155 B CN108683155 B CN 108683155B CN 201810345007 A CN201810345007 A CN 201810345007A CN 108683155 B CN108683155 B CN 108683155B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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Abstract
The invention discloses a kind of converter valve thyristor and capacitance-resistance parameter optimization methods and device, wherein method includes: by determining converter valve loss and overshoot voltage crucial effect parameter, which includes: on-state voltage drop, reverse recovery charge, damping capacitor and the damping resistance of converter valve；Using hyperbolic secant function model foundation thyristor reverse recovery current model, by thyristor reverse recovery current model, thyristor turn-off power loss and overshoot voltage are calculated according to crucial effect parameter；It is no more than predetermined voltage threshold as boundary condition using converter valve overshoot voltage, determines corresponding the most optimized parameter value when converter valve total losses minimum.The present invention comprehensively considers the matching relationship between thyristor and capacitance-resistance parameter from global angle, realize the reversed overshoot voltage of converter valve and the converter valve multi-parameter global optimization method that loss optimizes, key components reliability is improved, ensure that the safe and reliable operation of converter valve.
Description
Technical field
The present invention relates to the direct-current transmission converter valve electrical design fields in power electronics, and in particular to a kind of converter valve is brilliant
Brake tube and capacitance-resistance parameter optimization method and device.
Background technique
China is vast in territory, and the distributed pole of power generation energy resource and power load is unbalanced, this objective reality determines China
The trans-regional certainty flowed on a large scale of electric power.Extra-high voltage direct-current transmission is currently the only achievable that ten thousand MW class electric energy are efficient
Rate is delivered to the advanced technology of transmission of electricity other than 2,000 kilometers.With the promotion of direct current transportation capacity, increase core equipment converter valve
Electrical stress and thermal stress, design and operation to converter valve bring new challenge.
When valve commutation shutdown, circuit topology mutates, and inductance in circuit, the energy storage in capacity cell will divide again
Match, forms electromagnetic transient.Since the change of current becomes the presence of leakage inductance, leakage inductance electric current cannot be mutated, and can be generated very at the both ends of valve
High voltage.Voltage stress in order to prevent, generally in a thyristor both ends capacitance-resistance circuit in parallel.In the circuit resistance it is main its
Damped oscillation effect, and selection larger capacitance value can effectively inhibit commutation overshoot voltage, and the increase of capacitance will certainly add
The loss of big valve.Currently, high voltage direct current transmission converter valve rated DC current flow horizontal is continuously improved, and the promotion of current levels will
Mean that the increase of thyristor loss can fit in converter valve thyristor design process to effectively contain inverter loss level
When extending its carrier lifetime, to reduce on-state voltage drop to achieve the goal.But the extension of carrier lifetime is this means that anti-
Raising to the decrease of recovery capability, reverse recovery current and charge level will significantly increase Reverse recovery overshoot, and brilliant lock
Loss caused by pipe shutdown.
Therefore, it is necessary to optimize calculating to the electric parameter.Both at home and abroad about converter valve electric parameter optimization design,
Selection is optimized just for capacitance-resistance parameter and does not comprehensively consider the matching between thyristor and capacitance-resistance parameter from global angle
Relationship.
Summary of the invention
Therefore, the present invention provides a kind of converter valve thyristor and capacitance-resistance parameter optimization method and device, solves large capacity
The problem that converter valve voltage endurance capability is weak and loss is high, finally realizes the optimization of converter valve electrical stress and thermal stress, improves
Key components reliabilities, ensure that the safe and reliable operation of converter valve, to meet the use demand of increasingly big transmission line capability.
To achieve the goals above, the present invention provides a kind of converter valve thyristor and capacitance-resistance parameter optimization method, including such as
Lower step: converter valve loss and overshoot voltage crucial effect parameter are determined, the crucial effect parameter includes: the on-state of converter valve
Pressure drop, reverse recovery charge, damping capacitor and damping resistance；Utilize hyperbolic secant function model foundation thyristor Reverse recovery electricity
Flow model calculates thyristor turn-off power loss according to the crucial effect parameter by the thyristor reverse recovery current model
And overshoot voltage；It is no more than predetermined voltage threshold as boundary condition using the converter valve overshoot voltage, determines that the converter valve is total
Loss corresponding the most optimized parameter when minimum.
Preferably, described by the thyristor reverse recovery current model, it is calculated according to the crucial effect parameter brilliant
Brake tube shutoff loss and overshoot voltage, comprising: according to on-state voltage drop, the Reverse recovery of the converter valve in the crucial effect parameter
Charge, damping capacitor determine converter valve total losses；According in the crucial effect parameter reverse recovery charge, damping capacitor and
Damping resistance determines overshoot voltage.
Preferably, the on-state voltage drop according in the crucial effect parameter, reverse recovery charge, damping capacitor determine
Converter valve total losses, comprising: the thyristor on-state loss of converter valve is calculated according to the on-state voltage drop；According to the Reverse recovery
The thyristor turn-off power loss of charge calculating converter valve；The capacitance-resistance return loss of converter valve is calculated according to the damping capacitor；It calculates
The sum of the thyristor on-state loss, thyristor turn-off power loss and capacitance-resistance return loss obtain the converter valve total losses.
Preferably, the computation model of the thyristor on-state loss is established according to the formula of thyristor on-state loss；By institute
It states on-state voltage drop and substitutes into the computation model of the thyristor on-state loss and obtain the thyristor on-state loss.
Preferably, the computation model of the thyristor turn-off power loss is determined according to the calculation formula of thyristor turn-off power loss；
The computation model that the reverse recovery charge substitutes into the thyristor turn-off power loss is obtained into the thyristor turn-off power loss.
Preferably, the computation model of the capacitance-resistance return loss is determined according to the calculation formula of capacitance-resistance return loss；By institute
It states damping capacitor and substitutes into the computation model of the capacitance-resistance return loss and obtain the capacitance-resistance return loss.
Preferably, the reverse recovery current I in the thyristor reverse recovery current model is determined by following formularr:
Wherein, IrrmReverse recovery current peak value；K current over-zero moment slope；Sech () indicates hyperbolic secant function；ta
The electric current rising peak time；tbDown slope time；τa、τb' it is time constant,△T is time interval；t1For deviation time.
To achieve the goals above, the present invention also provides a kind of converter valve thyristor and capacitance-resistance parameter optimization device, packet
It includes: crucial effect parameter determination module, for determining converter valve loss and overshoot voltage crucial effect parameter, the crucial effect
Parameter includes: on-state voltage drop, reverse recovery charge, damping capacitor and the damping resistance of converter valve；Thyristor reverse recovery current
Model building module: for utilizing hyperbolic secant function model foundation thyristor reverse recovery current model, pass through the brilliant lock
Pipe reverse recovery current model calculates thyristor turn-off power loss and overshoot voltage according to the crucial effect parameter；It optimizes and closes
Bond parameter determining module, for being no more than predetermined voltage threshold as boundary condition, described in determination using the converter valve overshoot voltage
Corresponding the most optimized parameter when converter valve total losses minimum.
To achieve the goals above, the present invention also provides a kind of non-transient computer readable storage mediums, described non-transient
Computer-readable recording medium storage computer instruction realizes such as the above-mentioned change of current when computer instruction is executed by processor
Valve thyristor and capacitance-resistance parameter optimization method.
To achieve the goals above, the present invention also provides a kind of converter valve thyristor and capacitance-resistance parameter optimization equipment, comprising:
At least one processor；And the memory being connect at least one described processor communication；Wherein, the memory is stored with
The instruction that can be executed by least one described processor, described instruction be executed by least one described processor so that it is described extremely
A few processor executes above-mentioned converter valve thyristor and capacitance-resistance parameter optimization method.
Technical solution of the present invention has the advantages that
Converter valve thyristor provided by the invention and capacitance-resistance parameter optimization method, by determining converter valve loss and overshoot electricity
Crucial effect parameter is pressed, which includes: on-state voltage drop, reverse recovery charge, damping capacitor and the resistance of converter valve
Buffer resistance；Using hyperbolic secant function model foundation thyristor reverse recovery current model, pass through thyristor reverse recovery current
Model calculates thyristor turn-off power loss and overshoot voltage according to crucial effect parameter；It is no more than with converter valve overshoot voltage default
Voltage threshold is boundary condition, determines corresponding the most optimized parameter value when converter valve total losses minimum.The present invention is from global
Angle comprehensively considers the matching relationship between thyristor and capacitance-resistance parameter, realizes what the reversed overshoot voltage of converter valve and loss optimized
Converter valve multi-parameter global optimization method, improves key components reliability, ensure that the safe and reliable operation of converter valve.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the stream of a specific example of converter valve thyristor and capacitance-resistance parameter optimization method in the embodiment of the present invention 1
Cheng Tu；
Fig. 2 is the simulation circuit model schematic diagram established in the embodiment of the present invention 1；
Fig. 3 is the composition schematic diagram of converter valve in the embodiment of the present invention 1；
Fig. 4 is capacitance-resistance parameter value schematic diagram under on-state voltage drops different in the embodiment of the present invention 1；
Fig. 5 is the relation curve schematic diagram of different on-state voltage drops and total losses in the embodiment of the present invention 1；
Fig. 6 is the principle frame of the specific example of converter valve thyristor and capacitance-resistance parameter optimization device in the embodiment of the present invention 2
Figure；
Fig. 7 is the original of a specific example of converter valve thyristor and capacitance-resistance parameter optimization equipment in the embodiment of the present invention 4
Manage block diagram.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
Embodiment 1
The embodiment of the present invention provides a kind of converter valve thyristor and capacitance-resistance parameter optimization method, as shown in Figure 1, including as follows
Step:
Step S1: converter valve loss and overshoot voltage crucial effect parameter are determined, crucial effect parameter includes: converter valve
On-state voltage drop, reverse recovery charge, damping capacitor and damping resistance.
In practical application, converter valve is made of multiple components, and each component can generate loss in operation, wherein brilliant
The specific gravity that brake tube loss and capacitance-resistance return loss account for total losses is larger, reaches 90% or so.Therefore, the master when carrying out loss optimizing
Consider thyristor loss and capacitance-resistance return loss.
Wherein, thyristor loss includes on-state loss and turn-off power loss, in one embodiment, thyristor on-state loss PonMeter
Calculation method can be described with formula (1):
In formula, U0For thyristor on-state threshold voltage, R0On-state slope resistance, NtFor single valve Thyristors in series number, IdTo change
Valve DC current is flowed, μ is angle of overlap, thyristor on-state voltage drop: UT=U0+R0Id.It can show that thyristor is logical by above-mentioned formula (1)
State loss and on-state voltage drop positive correlation.Therefore, the calculating mould of thyristor on-state loss can be established according to above-mentioned formula (1)
On-state voltage drop is updated in the computation model of thyristor on-state loss by type, available thyristor on-state loss.
Above-mentioned thyristor turn-off power loss PoffCalculation method can be described with formula (2):
In formula, QrrFor thyristor reverse recovery charge, Uv0For converter transformer valve side maximum steady state non-loaded line voltage effective value,
Di/dt is thyristor cut-off current zero-acrross ing moment slope, and λ is Trigger Angle, and f is working frequency.Crystalline substance can be obtained by above-mentioned formula (2)
Brake tube shutoff loss is proportional with reverse recovery charge.Therefore, thyristor turn-off power loss can be established according to above-mentioned formula (2)
Computation model, reverse recovery charge is updated in the computation model of thyristor turn-off power loss, the shutdown of available thyristor
Loss.
Above-mentioned capacitance-resistance return loss PRIt can be described by calculation formula (3):
In formula, f is working frequency, Uv0For converter transformer valve side maximum steady state non-loaded line voltage effective value, CdFor damping capacitor
Value, λ is Trigger Angle, and μ is angle of overlap.It can be obtained by above-mentioned calculation formula (3), in the case where on-state voltage drop is certain, capacitance-resistance is returned
Only and capacitance related with damping capacitor more lossy is also bigger for path loss consumption.Therefore, thyristor can be established according to above-mentioned formula (3)
Damping capacitor is updated in the computation model of thyristor capacitance-resistance return loss by the computation model of capacitance-resistance return loss, can be obtained
To thyristor capacitance-resistance return loss.
It is analyzed according to the above-mentioned expression formula being respectively lost it is found that the major influence factors of thyristor loss are on-state pressure
Drop and reverse recovery charge；The major influence factors of capacitance-resistance return loss are damping capacitor, according to changing in crucial effect parameter
On-state voltage drop, reverse recovery charge, the damping capacitor of stream valve determine converter valve total losses.And thyristor shutdown overshoot voltage is main
Influence factor is reverse recovery charge, damping capacitor and damping resistance, according to the reverse recovery charge in crucial effect parameter, resistance
Buddhist nun's capacitor and damping resistance determine overshoot voltage.Therefore, by the above process it was determined that converter valve key components thyristor
With the main electrical parameters in capacitance-resistance circuit, including on-state voltage drop, reverse recovery charge, damping resistance and damping capacitor.
Step S2: utilizing hyperbolic secant function model foundation thyristor reverse recovery current model, reversed by thyristor
Restoring current model calculates thyristor turn-off power loss and overshoot voltage according to crucial effect parameter.
The reversed overshoot voltage of converter valve and thyristor turn off process are closely related, for the accuracy for guaranteeing overshoot voltage, sheet
Invention, which is established, establishes thyristor reverse recovery current hyperbolic secant correction model based on test data, is found out according to test data
Hyperbolic secant function each section coefficient.Thyristor reverse recovery current is imported artificial circuit by controlled current source by the model
In, the model is introduced at the thyristor shutdown moment.Reverse recovery current is exactly reverse recovery charge Qrr to the integral of time, is
Thyristor Reverse recovery model under different on-state voltage drops is established, need to determine the relationship of on-state voltage drop and reverse recovery charge, then is led to
Cross that reverse recovery charge is counter to release reverse recovery current.
The 8.5kV thyristor on-state voltage drop and reverse recovery charge that the embodiment of the present invention is provided according to thyristor producer close
System, establishes different on-state voltage drop thyristor reverse recovery current models.The model is by controlled current source come analog current value, root
According to reverse recovery current IrrCalculation formula (4) obtains hyperbolic secant function each section coefficient,
Wherein, IrrmReverse recovery current peak value；K current over-zero moment slope；Sech () indicates hyperbolic secant function；ta
The electric current rising peak time；tbDown slope time；τaτb' it is time constant, △ t is time interval；t1For deviation time.
Since reverse recovery current is the crucial effect parameter for influencing thyristor turn-off power loss and overshoot voltage, according to brilliant lock
Pipe reverse recovery current model, available reverse recovery current then obtain reverse recovery charge, according to reverse recovery charge
And other related keyword affecting parameters thyristor turn-off power losses and overshoot voltage.
Step S3: predetermined voltage threshold is no more than as boundary condition using converter valve overshoot voltage, determines converter valve total losses
Corresponding the most optimized parameter when minimum.
By calculating different parameters lower valve turn-off power loss, on-state loss and damping circuit loss and overshoot voltage width
Value need to guarantee that single valve overshoot voltage is no more than valve arrester operation voltage as boundary condition to operate normally, choose one group and always damage
Brake tube on-state voltage drop and its capacitance-resistance parameter when consumption is minimum, as the most optimized parameter.
Optionally, in some embodiments of the invention, the converter valve thyristor and capacitance-resistance parameter optimization method can be applied
In such as converter valve 6 pulsation bridge circuit, in order to optimize the parameter of each converter valve in the pulsation bridge circuit of converter valve 6, initially set up
Thyristor reverse recovery current is imported 6 fluctuation bridges by controlled current source by 6 fluctuation bridge simulation circuit model of converter valve, the model
In artificial circuit, reverse recovery current hyperbolic secant correction model is introduced at the thyristor shutdown moment.In the artificial circuit of foundation
Computing module, the computing module of thyristor turn-off power loss and the meter of capacitance-resistance return loss of thyristor on-state loss are added in model
Module is calculated, the loss of thyristor is calculated.For converter valve when commutation turns off, since the change of current becomes the presence of leakage inductance, leakage inductance electric current cannot
Mutation can generate very high overshoot voltage at the both ends of valve, the voltage mainly with thyristor reverse recovery charge, damping capacitor and
Damping resistance is related, to inhibit the overshoot voltage that need to reasonably select above-mentioned overshoot voltage crucial effect parameter.Overshoot voltage calculates
It can be solved by the simulation circuit model of foundation, while according to valve arrester minimal current leakage, determine minimal overshoot electricity
Pressure value.Using multiple iteration optimization module, calculate different parameters lower valve turn-off power loss, on-state loss and damping circuit loss with
And overshoot voltage amplitude.Converter valve need to guarantee that single valve overshoot voltage is no more than valve arrester operation voltage in normal operation, with this
For boundary condition, the smallest brake tube on-state voltage drop of one group of total losses and its capacitance-resistance parameter are chosen.
As shown in Fig. 2, the 6 fluctuation bridge simulation circuit model of converter valve includes: AC electric power systems 11, converter power transformer
12, bridge convertor circuit 13, smoothing reactor and DC line 14.When it is implemented, can be soft with electro-magnetic transient software PSCAD
Part establishes 6 fluctuation bridge simulation circuit models, and bridge convertor circuit 13 is made of 6 valve groups (V1~V6), and each valve group both ends are simultaneously
Join valve arrester 15, is used for valve overvoltage protection.Each valve group periodicity turn-on and turn-off realize AC-DC conversion.
As shown in figure 3, each valve group is by multistage thyristor 16 and its component damping resistance Rd, damping capacitor Cd, direct current presses
Resistance Rdc, saturable reactor 17 and controlled voltage source 18 constitute.
It is to establish 6 pulsation as shown in Figure 2 by taking ± 800kV5000A DC transmission engineering as an example in the embodiment of the present invention
Bridge simulation circuit model determines the direct current systems device parameter such as AC system, converter power transformer according to the engineering system parameter.Bridge
In formula converter circuit 13, the series connection series of each valve group thyristor 16, the parameter of valve arrester 15 need to be determined, and damping electricity is set
Hinder Rd, damping capacitor CdIt is variable with 16 on-state voltage drop of thyristor, other parameters are all determining value.Thyristor 16 is chosen
8.5kV5000A, every 8 grades or 9 grades of thyristors 16 constitute a components and 2 reactors of connecting, open-minded for limiting thyristor 16
When di/dt.
Minimum to obtain the loss of converter valve single valve, the embodiment of the present invention has calculated separately single valve on-state loss, turn-off power loss
With capacitance-resistance return loss, specific gravity shared by the other losses of single valve is smaller by only 10% or so, while not by on-state voltage drop and capacitance-resistance
The influence of parameter.Each section loss calculation module is established in 6 fluctuation bridge artificial circuits, by monitoring each section voltage and current,
And loss is found out by integral in one cycle.16 on-state loss of thyristor is logical by the thyristor in simulation circuit model
The computing module of state loss show that 16 turn-off power loss of thyristor is by 16 turn-off power loss of thyristor in simulation circuit model
Computing module show that capacitance-resistance return loss is obtained by the computing module of the capacitance-resistance return loss in simulation circuit model.It changes
Valve is flowed when commutation turns off, and since the change of current becomes the presence of leakage inductance, leakage inductance electric current cannot be mutated, and can be generated at the both ends of valve very high
Overshoot voltage, the voltage mainly with 16 reverse recovery charge of thyristor, damping resistance RdWith damping capacitor CdIt is related, to inhibit to be somebody's turn to do
Overshoot voltage need to reasonably select above-mentioned parameter.Overshoot voltage is calculated to be solved by the simulation circuit model established, while root
According to 15 minimal current leakage of valve arrester, minimal overshoot voltage value is determined.
The simulation circuit model of the embodiment of the present invention uses multiple iteration optimization module, calculates thyristor under different parameters
16 turn-off power loss, on-state loss and damping circuit loss and overshoot voltage amplitude.Converter valve need to guarantee list in normal operation
Valve overshoot voltage is no more than 15 operation voltage of valve arrester, as boundary condition, chooses one group of total losses minimum thyristor 16
On-state voltage drop and its capacitance-resistance parameter.
Reverse recovery current hyperbolic secant correction model 6 fluctuation bridge of converter valve is imported at the shutdown moment of thyristor 16 to imitate
True circuit adjusts on-state voltage drop and capacitance-resistance parameter by multiple parameter iteration computation model, calculates valve overshoot voltage and valve is total
The smallest one group of on-state voltage drop and capacitance-resistance parameter is lost meeting therefrom to choose in overshoot voltage required value in loss.
According to above-mentioned rule, it is known that the selection of damping resistance depends on the selection of damping capacitor value.Damping capacitor is smaller to be had
Conducive to turn-off power loss is reduced, damping capacitor is conducive to reduce Reverse recovery peak overshoot greatly.Therefore, capacitance is needed at the two
It carries out becoming in key index and preferably select, loss need to be made to minimize under safety margin in shutdown voltage.Define shutdown overshoot peace
Complete horizontal index is PCOV chargeability, and value should not exceed 1, i.e., (alternating voltage maximum, Trigger Angle are most for converter valve maximum
Greatly, DC current is maximum) continuous operation when commutation peak overshoot 15 operation voltage of valve arrester (corresponding leakage current is 1mA)
Below and there are certain nargin.For converter valve in continuous operation, 15 leakage current of valve arrester should be less than 4mA, meet
The requirement of 15 leakage current of valve arrester, chooses lesser capacitance, and the embodiment of the present invention calculates selection overshoot voltage required value and is
305kV.It can be to rush voltage limit with 305kV in the hope of different on-state voltage drops and capacitance-resistance parameter overshoot voltage value by emulation
Determine capacitance-resistance parameter value under different on-state voltage drops, as shown in Figure 4.
According to choosing the position of minimum capacitance for meeting overshoot voltage requirement and corresponding resistance value in Fig. 4 and calculate corresponding
Single valve loss, can show that the relation curve of different on-state voltage drops and total losses is as shown in Figure 5.It can be concluded that, expired according to Fig. 5
In the smaller overshoot voltage required value of foot, 16 on-state voltage drop V of thyristorTM=1.76V, damping parameter Rd=36 Ω, CdIt is total when=1 μ F
Minimum 5.11kW is lost.Therefore, optimal thyristor 16 and capacitance-resistance parameter are chosen are as follows: VTM=1.76V, Rd=36 Ω, Cd=1
μF。
Embodiment 2
The embodiment of the present invention provides a kind of converter valve thyristor and capacitance-resistance parameter optimization device, as shown in Figure 6, comprising:
Crucial effect parameter determination module 1, for determining converter valve loss and overshoot voltage crucial effect parameter, the pass
Key affecting parameters include: on-state voltage drop, reverse recovery charge, damping capacitor and the damping resistance of converter valve.Converter valve in practice
It is made of multiple components, each component can generate loss in operation, and wherein thyristor loss and capacitance-resistance return loss account for
The specific gravity of total losses is larger, reaches 90% or so.Therefore, it need to only consider that thyristor loss and capacitance-resistance are returned when carrying out loss optimizing
Path loss consumption.Overshoot voltage major influence factors are turned off according to above-mentioned loss formula (1), formula (2) and formula (3) and thyristor
For reverse recovery charge, damping capacitor and damping resistance.Accordingly, it is determined that converter valve key components thyristor 16 and capacitance-resistance are returned
The main electrical parameters on road, including on-state voltage drop, reverse recovery charge, damping resistance and damping capacitor.
Thyristor reverse recovery current model building module 2, for anti-using hyperbolic secant function model foundation thyristor
To restoring current model, by the thyristor reverse recovery current model, thyristor shutdown is calculated according to crucial effect parameter
Loss and overshoot voltage.According to the computing module added in above-mentioned electro-magnetic transient software PSCAD software calculate respectively thyristor and
The loss in capacitance-resistance circuit, the sum of loss of the two are the total losses of converter valve.Valve overshoot voltage is flowed, it can be temporary by above-mentioned electromagnetism
Model is established in state software PSCAD software to be calculated.
Key parameter determining module 3 is optimized, for being no more than predetermined voltage threshold with the converter valve overshoot voltage
Boundary condition determines corresponding the most optimized parameter when the converter valve total losses minimum.Converter valve need to guarantee list in normal operation
Valve overshoot voltage is no more than valve arrester operation voltage, as boundary condition, chooses one group of total losses minimum thyristor on-state
Pressure drop and its capacitance-resistance parameter.
Embodiment 3
The embodiment of the present invention provides a kind of non-transient computer readable storage medium, is stored thereon with computer storage medium
Computer executable instructions are stored with, which can be performed converter valve thyristor and capacitance-resistance in embodiment 1
Parameter optimization method.Wherein, storage medium can for magnetic disk, CD, read-only memory (Read-Only Memory, ROM),
Random access memory (Random Access Memory, RAM), flash memory (Flash Memory), hard disk (Hard
Disk Drive, abbreviation: HDD) or solid state hard disk (Solid-State Drive, SSD) etc.；Storage medium can also include upper
State the combination of the memory of type.
Embodiment 4
The embodiment of the present invention also provides a kind of converter valve thyristor and capacitance-resistance parameter optimization equipment, as shown in fig. 7, comprises:
At least one processor 210, such as CPU (Central Processing Unit, central processing unit), and and at least one
The memory 220 of processor communication connection；In Fig. 7 by taking a processor 210 as an example.The system can also include: input unit
230。
Processor 210, memory 220, input unit 230 can be connected by bus 200 or other modes, in Fig. 7
For being connected by bus 200.
Wherein, memory 220 is stored with the instruction that can be executed by processor 210, and processor 210 is stored in by operation
Non-transient software program, instruction and module in reservoir 220, at the various function application and data of server
Reason, i.e. method in realization embodiment 1.
Input unit 230 can receive the number or character information of input, and generate the processing unit with list items operation
User setting and function control related key signals input.
One or more module is stored in memory 220, when being executed by one or more processor 210, is held
Row method as shown in Figure 1.
The said goods can be performed the embodiment of the present invention 1 provided by method, have the corresponding functional module of execution method and
Beneficial effect.The not technical detail of detailed description in embodiments of the present invention, for details, reference can be made in embodiment as shown in Figure 1
Associated description.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of converter valve thyristor and capacitance-resistance parameter optimization method, which comprises the steps of:
Determine that converter valve total losses and overshoot voltage crucial effect parameter, the crucial effect parameter include: the on-state of converter valve
Pressure drop, reverse recovery charge, damping capacitor and damping resistance；
Using hyperbolic secant function model foundation thyristor reverse recovery current model, pass through the thyristor reverse recovery current
Model calculates converter valve total losses and overshoot voltage according to the crucial effect parameter；
It is no more than predetermined voltage threshold as boundary condition using the converter valve overshoot voltage, determines that the converter valve total losses are minimum
When corresponding the most optimized parameter.
2. converter valve thyristor according to claim 1 and capacitance-resistance parameter optimization method, which is characterized in that described to pass through institute
Thyristor reverse recovery current model is stated, converter valve total losses and overshoot voltage are calculated according to the crucial effect parameter, comprising:
Converter valve is determined according to on-state voltage drop, reverse recovery charge, the damping capacitor of the converter valve in the crucial effect parameter
Total losses；
Overshoot voltage is determined according to reverse recovery charge, damping capacitor and the damping resistance in the crucial effect parameter.
3. converter valve thyristor according to claim 2 and capacitance-resistance parameter optimization method, which is characterized in that described according to institute
It states the on-state voltage drop in crucial effect parameter, reverse recovery charge, damping capacitor and determines converter valve total losses, comprising:
The thyristor on-state loss of converter valve is calculated according to the on-state voltage drop；
The thyristor turn-off power loss of converter valve is calculated according to the reverse recovery charge；
The capacitance-resistance return loss of converter valve is calculated according to the damping capacitor；
The sum of the thyristor on-state loss, thyristor turn-off power loss and capacitance-resistance return loss are calculated, it is total to obtain the converter valve
Loss.
4. converter valve thyristor and capacitance-resistance parameter optimization method according to claim 3, which is characterized in that logical according to thyristor
The formula of state loss establishes the computation model of the thyristor on-state loss；
The computation model that the on-state voltage drop substitutes into the thyristor on-state loss is obtained into the thyristor on-state loss.
5. converter valve thyristor and capacitance-resistance parameter optimization method according to claim 3, which is characterized in that closed according to thyristor
The calculation formula of breakdown consumption determines the computation model of the thyristor turn-off power loss；
The computation model that the reverse recovery charge substitutes into the thyristor turn-off power loss is obtained into the thyristor turn-off power loss.
6. converter valve thyristor according to claim 3 and capacitance-resistance parameter optimization method, which is characterized in that
The computation model of the capacitance-resistance return loss is determined according to the calculation formula of capacitance-resistance return loss；
The computation model that the damping capacitor substitutes into the capacitance-resistance return loss is obtained into the capacitance-resistance return loss.
7. converter valve thyristor according to claim 1 and capacitance-resistance parameter optimization method, which is characterized in that pass through following public affairs
Formula determines the reverse recovery current I in the thyristor reverse recovery current modelrr:
Wherein, IrrmReverse recovery current peak value；K current over-zero moment slope；Sech () indicates hyperbolic secant function；taElectric current
The rising peak time；T indicates time variable；τa、τb' it is time constant,△T is time interval；t1For deviation time.
8. a kind of converter valve thyristor and capacitance-resistance parameter optimization device characterized by comprising
Crucial effect parameter determination module, for determining converter valve total losses and overshoot voltage crucial effect parameter, the key
Affecting parameters include: on-state voltage drop, reverse recovery charge, damping capacitor and the damping resistance of converter valve；
Thyristor reverse recovery current model building module: for utilizing hyperbolic secant function model foundation thyristor Reverse recovery
Current model calculates converter valve total losses according to the crucial effect parameter by the thyristor reverse recovery current model
And overshoot voltage；
Key parameter determining module is optimized, for being no more than predetermined voltage threshold as perimeter strip using the converter valve overshoot voltage
Part determines corresponding the most optimized parameter when the converter valve total losses minimum.
9. a kind of non-transient computer readable storage medium, which is characterized in that the non-transient computer readable storage medium is deposited
Computer instruction is stored up, such as claim 1-7 described in any item converter valves are realized when the computer instruction is executed by processor
Thyristor and capacitance-resistance parameter optimization method.
10. a kind of converter valve thyristor and capacitance-resistance parameter optimization equipment characterized by comprising at least one processor；And
The memory being connect at least one described processor communication；Wherein, be stored with can be by described at least one for the memory
The instruction that device executes is managed, described instruction is executed by least one described processor, so that at least one described processor executes such as
Converter valve thyristor of any of claims 1-7 and capacitance-resistance parameter optimization method.
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| CN112784513B (en) * | 2020-12-31 | 2023-10-27 | 中国长江三峡集团有限公司 | Loss calculation method and device for clamping circuit of sub-module of integrated gate bipolar transistor-MMC converter valve |
| CN113162099B (en) * | 2021-03-22 | 2023-01-13 | 清华大学 | Thyristor on-line on-state voltage monitoring system and method |
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