CN107817415A - A kind of bipolar short trouble variable characteristics analysis method of converter and system - Google Patents
A kind of bipolar short trouble variable characteristics analysis method of converter and system Download PDFInfo
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- CN107817415A CN107817415A CN201711105132.0A CN201711105132A CN107817415A CN 107817415 A CN107817415 A CN 107817415A CN 201711105132 A CN201711105132 A CN 201711105132A CN 107817415 A CN107817415 A CN 107817415A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a kind of converter bipolar short trouble variable characteristics analysis method, system, terminal and readable storage medium storing program for executing, wherein, this method comprises the following steps：Obtain converter and the state variable of AC and DC side during bipolar short trouble occurs, state equation is established according to state variable；Failure variable characteristics analysis is carried out according to state equation.This bipolar short trouble variable characteristics analysis method establishes state equation according to the state variable related to DC side and AC, state equation is handled to carry out failure variable characteristics analysis after obtaining the fault status information of DC side and AC, the DC side state variable after failure can not only be analyzed, AC state variable after failure can also be analyzed, improve the comprehensive and accuracy of bipolar analysis of Short Circuit Fault.
Description
Technical field
The present invention relates to flexible converter equipment protection and control technology field, and in particular to a kind of bipolar short circuit of converter
Failure variable characteristics analysis method and system.
Background technology
Traditional fossil energy also brings many serious problems such as environmental pollution while people's consumption is met, thus
It is extremely urgent to develop renewable and clean energy resource technology, because clean energy resource shows direct current property mostly, by these clean energy resourcies
The conversion of electrical energy form need to be carried out by power electronic equipment by being incorporated to AC network.Flexible converter equipment is exactly to realize alterating and direct current
The novel electric power of the conversion of energy form and energy transmission is equipped.After accessing flexible converter equipment in power network, electric power can be greatly enhanced
The controllability of system, make the scheduling of power system more flexible, improve many maneuverability of the system including the quality of power supply
Energy.
Contain a large amount of power electronic elements yet with flexible converter device interior, its tolerance to short circuit current has
Limit, especially when bipolar short trouble occurs for flexible converter equipment DC side, consequence is often more serious, and short circuit current will be logical
Cross flexible converter device interior and form energy feed channels with trouble point, flexible converter equipment is born larger electric stress,
Even damage its internal expensive power electronic devices, thus study flexible converter equipment under bipolar short circuit fault condition by
It is significant for the work of design protection from now on to control current characteristic.Further, since inverter inside contains a large amount of electric power electricity
Sub- device, system will also show stronger nonlinear characteristic.
Based on flexible converter device pulse locking after failure, approximation is recognized for the research of existing bipolar short trouble at present
Be short circuit current based on DC bus capacitor discharge current, and only using the size of DC side fault current after failure as according to pair therefore
Barrier is analyzed, and so just causes accident analysis and actual conditions difference, not comprehensive enough accurate.
The content of the invention
Therefore, the technical problem to be solved in the present invention is to overcome bipolar analysis of Short Circuit Fault of the prior art not complete enough
The defects of face is accurate.
Therefore, the present invention provides following technical scheme：
First aspect present invention, there is provided a kind of bipolar short trouble variable characteristics analysis method of converter, including it is as follows
Step：Obtain converter and the state variable of AC and DC side during bipolar short trouble occurs, according to the state variable
Establish state equation；Failure variable characteristics analysis is carried out according to the state equation.
Alternatively, the state variable of AC and DC side when bipolar short trouble occurs for the acquisition converter,
In the step of state equation being established according to the state variable, including：According to setting for the converter that bipolar short trouble occurs
Standby structure establishes system model；Circuit mould when bipolar short trouble occurs for the converter is obtained according to the system model
Type, and simple equivalent circuit is obtained according to the circuit model；State variable, the shape are obtained according to the simple equivalent circuit
State variable includes the state variable of the AC and DC side；State variable vector, system are obtained according to the state variable
Matrix, input matrix and input voltage vector；According to state variable vector, sytem matrix, input matrix and the input
Voltage vector obtains state equation.
Alternatively, the state variable includes the phase current i of AC three-phase linea、ib、ic, DC side line short electricity
Flow idAnd DC bus capacitor residual voltage uc。
Alternatively, the state equation is the differential equation of the state variable.
Alternatively, the differential equation is established by equation below：
Wherein, A is the sytem matrix, and x is the state variable vector that the state variable is formed, and B is described defeated
Entering matrix, u is input voltage vector,For the differential vector of state variable vector.
Alternatively, the state variable vector is established by equation below,
X=(ia ib ic uc id)T
Wherein, iaFor the A phase phase currents in the phase current of the AC three-phase line, ibFor the AC triple line
B phase phase currents in the phase current on road, icFor the C phase phase currents in the phase current of the AC three-phase line, ucTo be described straight
Flow lateral capacitance residual voltage, idFor the DC line short circuit current；
The sytem matrix is established by equation below,
Wherein, RCFor AC all-in resistance, including the resistance of AC system and linked reactor；LCFor the total reactance of AC,
Reactance including AC system and linked reactor；Sa、Sb、ScA phases respectively in switch function switch, B phases switch and C phases
Switch；Sao、Sbo、ScoRespectively by controlling A phase controlling switch, B phase controlling switch and C phase controls in the switch function determined
Switch；C is DC side filter capacitor, and L is DC side line inductance, and R is DC side line resistance and fault resistance sum；
The input matrix is established by equation below,
Wherein, LCFor the total reactance of AC, include the reactance of AC system and linked reactor；
The input voltage vector is established by equation below,
U=(va vb vc 0 0)T
Wherein, vaFor the A phase phase voltages in three-phase alternating current system voltage, vbIt is mutually electric for the B phases in three-phase alternating current system voltage
Pressure, vcFor the C phase phase voltages in three-phase alternating current system voltage, U is three-phase alternating current phase voltage virtual value, and ω is three-phase alternating current
Frequency, φ be three-phase alternating current in A phase starting phase angles.
Alternatively, switch function is obtained and by controlling the switch function determined by equation below,
Wherein, Sa、Sb、ScA phases respectively in switch function are switched, B phases are switched and switched with C phases；Sao、Sbo、ScoRespectively
For by controlling A phase controlling switch, B phase controlling switch and C phase controlling switch in the switch function determined；SoFor switch function
Zero-sequence component；M is the modulation ratio of the converter；δ is modulating wave phase angle.
Second aspect of the present invention, there is provided a kind of bipolar short trouble variable characteristics analysis system of converter, including：Obtain
Module, for obtain converter occur bipolar short trouble when AC and DC side state variable, according to the state
Variable establishes state equation；Processing module, for carrying out failure variable characteristics analysis according to the state equation.
Alternatively, the acquisition module includes：System model unit, for being set according to the change of current that bipolar short trouble occurs
Standby device structure establishes system model；Equivalent circuit unit, sent out for obtaining the converter according to the system model
Circuit model during raw bipolar short trouble, and simple equivalent circuit is obtained according to the circuit model；State variable unit, use
In obtaining state variable according to the simple equivalent circuit, the state variable includes the AC and the state of DC side becomes
Amount；Matrix acquiring unit, for obtaining state variable vector, sytem matrix, input matrix and defeated according to the state variable
Enter voltage vector；State equation unit, for according to the state variable vector, sytem matrix, input matrix and input electricity
The amount of pressing to obtains state equation.
Third aspect present invention, there is provided a kind of terminal, including：At least one processor；And with least one place
Manage the memory of device communication connection；Wherein, have can be by the instruction of at least one computing device, institute for the memory storage
Instruction is stated by least one computing device, so that any institute of at least one computing device first aspect present invention
The method stated.
Fourth aspect present invention, there is provided a kind of computer-readable recording medium, be stored thereon with computer instruction, the instruction
The step of first aspect present invention any methods described is realized when being executed by processor.
Technical solution of the present invention, have the following advantages that：
The invention provides a kind of bipolar short trouble variable characteristics analysis method of converter, system, terminal and readable
Storage medium, wherein, this method comprises the following steps：Obtain converter and AC and DC side during bipolar short trouble occurs
State variable, state equation is established according to the state variable；Failure variable characteristics analysis is carried out according to the state equation.
This bipolar short trouble variable characteristics analysis method establishes state side according to the state variable related to DC side and AC
Journey, state equation is handled to carry out failure variable characteristics analysis after obtaining the fault status information of DC side and AC,
The DC side state variable after failure can not only be analyzed, the AC state variable after failure can also be divided
Analysis, improve the comprehensive and accuracy of bipolar analysis of Short Circuit Fault.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a specific example of the bipolar short trouble variable characteristics analysis method of converter in the embodiment of the present invention
Flow chart；
Fig. 2 is that another of the bipolar short trouble variable characteristics analysis method of converter specifically shows in the embodiment of the present invention
The flow chart of example；
Fig. 3 is converter system model in the embodiment of the present invention；
Circuit model when Fig. 4 is bipolar short trouble in the embodiment of the present invention；
Fig. 5 is simple equivalent circuit in the embodiment of the present invention；
Fig. 6 is system dc side short circuit current simulation waveform and numerical wave theory under overdamping condition in the embodiment of the present invention
Shape comparison diagram；
Fig. 7 is system dc side short circuit current simulation waveform and numerical wave theory under the conditions of underdamping in the embodiment of the present invention
Shape；
Fig. 8 is a specific example of the bipolar short trouble variable characteristics analysis system of converter in the embodiment of the present invention
Block diagram；
Fig. 9 is that another of the bipolar short trouble variable characteristics analysis system of converter specifically shows in the embodiment of the present invention
The block diagram of example；
Figure 10 is the structural representation of terminal in the embodiment of the present invention.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be with
It is the connection of two element internals, can is wireless connection or wired connection.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It is be combined with each other into conflict can.
The present embodiment provides a kind of bipolar short trouble variable characteristics analysis method of converter, as shown in figure 1, including such as
Lower step：
S1：Obtain converter and the state variable of AC and DC side during bipolar short trouble occurs, become according to state
Amount establishes state equation.
In the present embodiment, as shown in Fig. 2 step S1 specifically includes step S11-S15：
S11：System model is established according to the device structure for the converter that bipolar short trouble occurs.In the present embodiment
In, converter, which can simplify, is equivalent to three-phase half-bridge inverter circuit, and system model is as shown in figure 3, the A in Fig. 3 represents to hand over
Side power network is flowed, B represents direct current side system, and certainly, in other embodiments, converter can also be equivalent to other circuits, and
System model is established according to the equivalent circuit of converter, rationally set as needed.
S12：Circuit model when bipolar short trouble occurs for converter, bipolar short trouble are obtained according to system model
When circuit model as shown in figure 4, and simple equivalent circuit is obtained according to circuit model, simple equivalent circuit is as shown in Figure 5.
S13：State variable is obtained according to simple equivalent circuit, state variable includes AC and the state of DC side becomes
Amount.In the present embodiment, state variable includes the phase current i of AC three-phase linea、ib、ic, DC side line short circuit current
id, and DC bus capacitor residual voltage uc, certainly, in other embodiments, other state variables can also be included, such as only included straight
Side electric current and ac-side current are flowed, is rationally set as needed.
S14：State variable vector, sytem matrix, input matrix and input voltage vector are obtained according to state variable.
In the present embodiment, can by Kirchoff s voltage (KVL), electric current (KCL) law obtain state variable state variable vector,
Sytem matrix, input matrix and input voltage vector.
State variable vector is established by equation below,
X=(ia ib ic uc id)T
Wherein, iaFor the A phase phase currents in the phase current of AC three-phase line, ibFor the phase electricity of AC three-phase line
B phase phase currents in stream, icFor the C phase phase currents in the phase current of AC three-phase line, ucFor DC bus capacitor residual voltage, id
For DC line short circuit current.
Sytem matrix is established by equation below,
Wherein, RCFor AC all-in resistance, including the resistance of AC system and linked reactor；LCFor the total reactance of AC,
Reactance including AC system and linked reactor；Sa、Sb、ScA phases respectively in switch function switch, B phases switch and C phases
Switch；Sao、Sbo、ScoRespectively by controlling A phase controlling switch, B phase controlling switch and C phase controls in the switch function determined
Switch；C is DC side filter capacitor, and L is DC side line inductance, and R is DC side line resistance and fault resistance sum.
Input matrix is established by equation below,
Wherein, LCFor the total reactance of AC, include the reactance of AC system and linked reactor.
Input voltage vector is established by equation below,
U=(va vb vc 0 0)T
Wherein, vaFor the A phase phase voltages in three-phase alternating current system voltage, vbIt is mutually electric for the B phases in three-phase alternating current system voltage
Pressure, vcFor the C phase phase voltages in three-phase alternating current system voltage, U is three-phase alternating current phase voltage virtual value, and ω is three-phase alternating current
Frequency, φ be three-phase alternating current in A phase starting phase angles.
It is as follows to define switch function：
Switch function is the mathematical description to flexible converter facility switching device behavior, when being run due to flexible converter equipment
Modulating wave is symmetrical fundamental wave, therefore the fundametal compoment of above switch function will match with modulating wave, be opened by equation below
Close function and by controlling the switch function determined,
Wherein, Sa、Sb、ScA phases respectively in switch function are switched, B phases are switched and switched with C phases；Sao、Sbo、ScoRespectively
For by controlling A phase controlling switch, B phase controlling switch and C phase controlling switch in the switch function determined；SoFor switch function
Zero-sequence component；M is the modulation ratio of converter；δ is modulating wave phase angle.
S15：State equation is obtained according to state variable vector, sytem matrix, input matrix and input voltage vector.
In the present embodiment, state equation is the differential equation of state variable, and the differential equation is established by equation below：
Wherein, A is sytem matrix, and x is the state variable vector that state variable is formed, and B is input matrix, and u is input electricity
The amount of pressing to,For the differential vector of state variable vector.Therefore, state equation during the bipolar failure of flexible converter equipment generation can
It is expressed as：
S2：Failure variable characteristics analysis is carried out according to state equation.Using numerical algorithm on given system parameter and border
Under the conditions of state equation is solved, can analyze flexible converter equipment occur bipolar failure when state variable of concern, especially
It is the situation of change of the short circuit current flowed through on DC line, and then can analyze short circuit current feature, for flexible converter from now on
Corresponding Research foundation is established in the protection work that equipment accesses after power network on a large scale；And it can also analyze flexible converter equipment not close
Controlled short circuit current feature after direct current interpolar failure occurs under the conditions of lock, is more nearly system actual conditions, to protect work from now on
Lay a good foundation.
Numerical solution is carried out to state variable of concern using numerical analysis method to state equation, flexibility can be analyzed and changed
Under the effect of symmetrical fundamental modulation ripple bipolar short trouble occurs for flow device, and each electrical quantity especially flows through short on DC line
Temporary, the steady-state characteristic of road electric current.It is embodied in：The steady-state shortcircuit current passed through on DC line and the resistive parameter of line electricity
(such as：Line resistance, transition resistance) it is unrelated, exchange side system shows the property of current source in failure stable state；But transient state is short
Road electric current is then influenceed by above parameter, and when DC terminal short-circuit impedance is larger, transient short circuit current occurs without vibration overshoot, and
DC terminal short-circuit impedance hour short circuit current shows underdamped oscillation property.
Fig. 6 is system dc side short circuit current simulation waveform and numerical computations waveform comparison diagram under overdamping condition；Fig. 7 is
System dc side short circuit current simulation waveform and numerical computations waveform comparison diagram under the conditions of underdamping.From Fig. 6 and Fig. 7, no
Pipe DC side all-in resistance is much, the steady-state shortcircuit current of the bipolar short trouble DC line of flexible converter equipment without significant change,
But if DC line resistance and fault resistance are too small, transient short circuit current will appear from substantially vibrating.Increasing thus can be passed through
Adding system DC side damps, and prevents short circuit current from vibrating overshoot, avoids transient current excessive and flexible converter equipment is caused damage.
, steady state characteristic temporary to the controlled short circuit current of the bipolar failure of flexible converter equipment is summarized as follows：
The steady-state shortcircuit current and the resistive parameter of line electricity passed through on DC line is (such as：Line resistance, transition resistance) nothing
Close, exchange side system shows the property of current source in failure stable state；But transient short circuit current is then influenceed by above parameter,
When DC terminal short-circuit impedance is larger, transient short circuit current occurs without vibration overshoot, and DC terminal short-circuit impedance hour short circuit current
Then show underdamped oscillation property.
Above-mentioned bipolar short trouble variable characteristics analysis method is built according to the state variable related to DC side and AC
Vertical state equation, state equation is handled to carry out failure variable spy after obtaining the fault status information of DC side and AC
Property analysis, the DC side state variable after failure can not only be analyzed, can also to after failure AC state become
Amount is analyzed, and improves the comprehensive and accuracy of bipolar analysis of Short Circuit Fault.
A kind of bipolar short trouble variable characteristics analysis system of converter is present embodiments provided, the system is used to realize
Embodiment in embodiment, repeating no more for explanation was carried out.Term " module " as used below can be realized
The combination of the software and/or hardware of predetermined function.Although system described by following examples is preferably realized with software,
It is hardware, or the realization of the combination of software and hardware is also what may and be contemplated.
Fig. 8 is one of the bipolar short trouble variable characteristics analysis system of converter according to embodiments of the present invention specific
The system block diagram of example, including：
Acquisition module 81, become for obtaining the state of AC and DC side when bipolar short trouble occurs for converter
Amount, state equation is established according to state variable；Processing module 82, for carrying out failure variable characteristics analysis according to state equation.
In the present embodiment, as shown in figure 9, acquisition module 81 includes：System model unit 811, for double according to occurring
The device structure of the converter of pole short trouble establishes system model；Equivalent circuit unit 812, for being obtained according to system model
Circuit model when bipolar short trouble occurs for flow device is taken, and simple equivalent circuit is obtained according to circuit model；State becomes
Unit 813 is measured, for obtaining state variable according to simple equivalent circuit, state variable includes AC and the state of DC side becomes
Amount；Matrix acquiring unit 814, for obtaining state variable vector, sytem matrix, input matrix and defeated according to state variable
Enter voltage vector；State equation unit 815, for according to state variable vector, sytem matrix, input matrix and input electricity
The amount of pressing to obtains state equation.
The further function of above-mentioned modules describes same as the previously described embodiments, will not be repeated here.
The above-mentioned bipolar short trouble variable characteristics analysis system of converter has the comprehensive and accurate advantage of accident analysis.
A kind of terminal is present embodiments provided, as shown in Figure 10, including：At least one processor 1001, such as CPU
(Central Processing Unit, central processing unit), at least one communication interface 1003, memory 1004 are at least one
Communication bus 1002.Wherein, communication bus 1002 is used to realize the connection communication between these components.Wherein, communication interface
1003 can include display screen (Display), keyboard (Keyboard), and optional communication interface 1003 can also include having for standard
Line interface, wave point.Memory 1004 can be high-speed RAM memory (Ramdom Access Memory, effumability with
Machine accesses memory) or non-labile memory (non-volatile memory), a for example, at least disk
Memory.Memory 1004 optionally can also be at least one storage device for being located remotely from aforementioned processor 1001.Wherein
Processor 1001 can store batch processing code, and processor with reference to the system described by Fig. 8 and Fig. 9 in memory 1004
The program code stored in 1001 calling memories 1004, for performing a kind of bipolar short trouble variable characteristics of converter
Analysis method, that is, it is used to perform the bipolar short trouble variable characteristics analysis method of converter as in Fig. 1 and Fig. 2 embodiments.
Wherein, communication bus 1002 can be Peripheral Component Interconnect standard (peripheral component
Interconnect, abbreviation PCI) bus or EISA (extended industry standard
Architecture, abbreviation EISA) bus etc..Communication bus 1002 can be divided into address bus, data/address bus, controlling bus
Deng.For ease of representing, only represented in Figure 10 with a thick line, it is not intended that an only bus or a type of bus.
Wherein, memory 1004 can include volatile memory (English：Volatile memory), such as deposit at random
Access to memory (English：Random-access memory, abbreviation：RAM)；Memory can also include nonvolatile memory
(English：Non-volatile memory), such as flash memory (English：Flash memory), hard disk (English：hard
Disk drive, abbreviation：HDD) or solid state hard disc is (English：Solid-state drive, abbreviation：SSD)；Memory 1004 is also
The combination of the memory of mentioned kind can be included.
Wherein, processor 1001 can be central processing unit (English：Central processing unit, abbreviation：
CPU), network processing unit (English：Network processor, abbreviation：NP) or CPU and NP combination.
Wherein, processor 1001 can further include hardware chip.Above-mentioned hardware chip can be special integrated electricity
Road (English：Application-specific integrated circuit, abbreviation：ASIC), PLD (English
Text：Programmable logic device, abbreviation：PLD) or it is combined.Above-mentioned PLD can be complicated programmable logic device
Part (English：Complex programmable logic device, abbreviation：CPLD), field programmable gate array (English
Text：Field-programmable gate array, abbreviation：FPGA), GAL (English：generic array
Logic, abbreviation：GAL) or it is combined.
Alternatively, memory 1004 is additionally operable to storage program instruction.Processor 1201 can be instructed with caller, be realized such as
The bipolar short trouble variable characteristics analysis method of converter shown in the application Fig. 1 and Fig. 2 embodiment.
The embodiment of the present invention also provides a kind of computer-readable recording medium, and meter is stored with computer-readable recording medium
Calculation machine executable instruction, the computer executable instructions can perform the bipolar short circuit of converter in above-mentioned any means embodiment
Failure variable characteristics analysis method.Wherein, the storage medium can be magnetic disc, 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：) or solid state hard disc (Solid-State Drive, SSD) etc. HDD；Institute
The combination of memory of mentioned kind can also be included by stating storage medium.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.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 change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (11)
1. a kind of bipolar short trouble variable characteristics analysis method of converter, it is characterised in that comprise the following steps：
Obtain converter and the state variable of AC and DC side during bipolar short trouble occurs, built according to the state variable
Vertical state equation；
Failure variable characteristics analysis is carried out according to the state equation.
2. the bipolar short trouble variable characteristics analysis method of converter according to claim 1, it is characterised in that in institute
The state variable of AC and DC side when obtaining converter generation bipolar short trouble is stated, is established according to the state variable
In the step of state equation, including：
System model is established according to the device structure for the converter that bipolar short trouble occurs；
Circuit model when bipolar short trouble occurs for the converter is obtained according to the system model, and according to the electricity
Road model obtains simple equivalent circuit；
State variable is obtained according to the simple equivalent circuit, the state variable includes the state of the AC and DC side
Variable；
State variable vector, sytem matrix, input matrix and input voltage vector are obtained according to the state variable；
State equation is obtained according to the state variable vector, sytem matrix, input matrix and input voltage vector.
3. the bipolar short trouble variable characteristics analysis method of converter according to claim 2, it is characterised in that described
State variable includes the phase current (i of AC three-phase linea、ib、ic), DC side line short circuit current (id) and DC side
Capacitor residual voltage (uc)。
4. the bipolar short trouble variable characteristics analysis method of converter according to claim 3, it is characterised in that described
State equation is the differential equation of the state variable.
5. the bipolar short trouble variable characteristics analysis method of converter according to claim 4, it is characterised in that pass through
Equation below establishes the differential equation：
<mrow>
<mover>
<mi>x</mi>
<mo>&CenterDot;</mo>
</mover>
<mo>=</mo>
<mi>A</mi>
<mi>x</mi>
<mo>+</mo>
<mi>B</mi>
<mi>u</mi>
</mrow>
Wherein, A is the sytem matrix, and x is the state variable vector that the state variable is formed, and B is the input matrix, u
It is vectorial for the input voltage,For the differential vector of state variable vector.
6. the bipolar short trouble variable characteristics analysis method of converter according to claim 5, it is characterised in that pass through
Equation below establishes the state variable vector,
X=(ia ib ic uc id)T
Wherein, iaFor the A phase phase currents in the phase current of the AC three-phase line, ibFor the AC three-phase line
B phase phase currents in phase current, icFor the C phase phase currents in the phase current of the AC three-phase line, ucFor the DC side
Capacitor residual voltage, idFor the DC line short circuit current；
The sytem matrix is established by equation below,
<mrow>
<mi>A</mi>
<mo>=</mo>
<mfenced open = "(" close = ")">
<mtable>
<mtr>
<mtd>
<mrow>
<mo>-</mo>
<mfrac>
<msub>
<mi>R</mi>
<mi>c</mi>
</msub>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mrow>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<msub>
<mi>S</mi>
<mrow>
<mi>a</mi>
<mi>o</mi>
</mrow>
</msub>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mrow>
<mo>-</mo>
<mfrac>
<msub>
<mi>R</mi>
<mi>c</mi>
</msub>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mrow>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<msub>
<mi>S</mi>
<mrow>
<mi>b</mi>
<mi>o</mi>
</mrow>
</msub>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mrow>
<mo>-</mo>
<mfrac>
<msub>
<mi>R</mi>
<mi>c</mi>
</msub>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mrow>
</mtd>
<mtd>
<mfrac>
<msub>
<mi>S</mi>
<mrow>
<mi>c</mi>
<mi>o</mi>
</mrow>
</msub>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mfrac>
<msub>
<mi>S</mi>
<mi>a</mi>
</msub>
<mi>C</mi>
</mfrac>
</mtd>
<mtd>
<mfrac>
<msub>
<mi>S</mi>
<mi>b</mi>
</msub>
<mi>C</mi>
</mfrac>
</mtd>
<mtd>
<mfrac>
<msub>
<mi>S</mi>
<mi>c</mi>
</msub>
<mi>C</mi>
</mfrac>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<mn>1</mn>
<mi>C</mi>
</mfrac>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<mn>1</mn>
<mi>L</mi>
</mfrac>
</mtd>
<mtd>
<mrow>
<mo>-</mo>
<mfrac>
<mi>R</mi>
<mi>L</mi>
</mfrac>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
Wherein, RCFor AC all-in resistance, including the resistance of AC system and linked reactor；LCFor the total reactance of AC, including
The reactance of AC system and linked reactor；Sa、Sb、ScA phases respectively in switch function are switched, B phases are switched and switched with C phases；
Sao、Sbo、ScoRespectively by controlling A phase controlling switch, B phase controlling switch and C phase controlling switch in the switch function determined；C
For DC side filter capacitor, L is DC side line inductance, and R is DC side line resistance and fault resistance sum；
The input matrix is established by equation below,
<mrow>
<mi>B</mi>
<mo>=</mo>
<mfenced open = "(" close = ")">
<mtable>
<mtr>
<mtd>
<mfrac>
<mn>1</mn>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<mn>1</mn>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<mn>1</mn>
<msub>
<mi>L</mi>
<mi>c</mi>
</msub>
</mfrac>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
Wherein, LCFor the total reactance of AC, include the reactance of AC system and linked reactor；
The input voltage vector is established by equation below,
<mrow>
<msub>
<mi>v</mi>
<mi>a</mi>
</msub>
<mo>=</mo>
<msqrt>
<mn>2</mn>
</msqrt>
<mi>U</mi>
<mi> </mi>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>&omega;</mi>
<mi>t</mi>
<mo>+</mo>
<mi>&phi;</mi>
<mo>)</mo>
</mrow>
</mrow>
U=(va vb vc 0 0)T
Wherein, vaFor the A phase phase voltages in three-phase alternating current system voltage, vbFor the B phase phase voltages in three-phase alternating current system voltage,
vcFor the C phase phase voltages in three-phase alternating current system voltage, U is three-phase alternating current phase voltage virtual value, and ω is three-phase alternating current
Frequency, φ are A phase starting phase angles in three-phase alternating current.
7. the bipolar short trouble variable characteristics analysis method of converter according to claim 6, it is characterised in that pass through
Equation below obtains switch function and by controlling the switch function determined,
<mrow>
<msub>
<mi>S</mi>
<mi>a</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<mo>+</mo>
<mi>M</mi>
<mi> </mi>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>&omega;</mi>
<mi>t</mi>
<mo>+</mo>
<mi>&delta;</mi>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>S</mi>
<mi>o</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>S</mi>
<mi>a</mi>
</msub>
<mo>+</mo>
<msub>
<mi>S</mi>
<mi>b</mi>
</msub>
<mo>+</mo>
<msub>
<mi>S</mi>
<mi>c</mi>
</msub>
</mrow>
<mn>3</mn>
</mfrac>
</mrow>
<mrow>
<msub>
<mi>S</mi>
<mrow>
<mi>a</mi>
<mi>o</mi>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>S</mi>
<mi>a</mi>
</msub>
<mo>-</mo>
<msub>
<mi>S</mi>
<mi>o</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<msub>
<mi>S</mi>
<mi>a</mi>
</msub>
<mo>-</mo>
<msub>
<mi>S</mi>
<mi>b</mi>
</msub>
<mo>-</mo>
<msub>
<mi>S</mi>
<mi>c</mi>
</msub>
</mrow>
<mn>3</mn>
</mfrac>
<mo>=</mo>
<mi>M</mi>
<mi> </mi>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>&omega;</mi>
<mi>t</mi>
<mo>+</mo>
<mi>&delta;</mi>
<mo>)</mo>
</mrow>
</mrow>
Wherein, Sa、Sb、ScA phases respectively in switch function are switched, B phases are switched and switched with C phases；Sao、Sbo、ScoRespectively by
Control A phase controlling switch, B phase controlling switch and the C phase controlling switch in the switch function determined；SoFor the zero sequence of switch function
Component；M is the modulation ratio of the converter；δ is modulating wave phase angle.
A kind of 8. bipolar short trouble variable characteristics analysis system of converter, it is characterised in that including：
Acquisition module, for obtain converter occur bipolar short trouble when AC and DC side state variable, according to
The state variable establishes state equation；
Processing module, for carrying out failure variable characteristics analysis according to the state equation.
9. the bipolar short trouble variable characteristics analysis system of converter according to claim 8, it is characterised in that described
Acquisition module includes：
System model unit, for establishing system model according to the device structure for the converter that bipolar short trouble occurs；
Equivalent circuit unit, for obtaining circuit when bipolar short trouble occurs for the converter according to the system model
Model, and simple equivalent circuit is obtained according to the circuit model；
State variable unit, for obtaining state variable according to the simple equivalent circuit, the state variable includes the friendship
Flow the state variable of side and DC side；
Matrix acquiring unit, for according to the state variable obtain state variable vector, sytem matrix, input matrix and
Input voltage vector；
State equation unit, for according to the state variable vector, sytem matrix, input matrix and input voltage vector
Obtain state equation.
A kind of 10. terminal, it is characterised in that including：At least one processor；And connect with least one processor communication
The memory connect；Wherein, have can be by the instruction of at least one computing device for the memory storage, and the instruction is by institute
At least one computing device is stated, so that any described side at least one computing device the claims 1-7
Method.
11. a kind of computer-readable recording medium, is stored thereon with computer instruction, it is characterised in that the instruction is by processor
The step of any methods described in the claims 1-7 is realized during execution.
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| CN105138799A (en) * | 2015-09-18 | 2015-12-09 | 国网山东省电力公司电力科学研究院 | Method for designing parameter of direct current reactor suitable for modular multi-level converter |
| CN106018924A (en) * | 2016-06-22 | 2016-10-12 | 华北电力大学 | Direct-current power grid bipolar short-circuit fault current calculation method |
| CN107271782A (en) * | 2017-07-26 | 2017-10-20 | 全球能源互联网研究院 | Soft direct current current limiting reactor parameter determination method for overhead line |
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