CN105301406B - A kind of flexible direct-current transmission valve section short-circuit test test system and its method of testing - Google Patents
A kind of flexible direct-current transmission valve section short-circuit test test system and its method of testing Download PDFInfo
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- CN105301406B CN105301406B CN201510784606.3A CN201510784606A CN105301406B CN 105301406 B CN105301406 B CN 105301406B CN 201510784606 A CN201510784606 A CN 201510784606A CN 105301406 B CN105301406 B CN 105301406B
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Abstract
The invention discloses a kind of flexible direct-current transmission valve section short-circuit test test system and its method of testing, it is therefore intended that：Reduce cost, improve reliability, make short circuit current flexibly controllable, can real simulation actual conditions, technical scheme is used by present system：Including first contactor (SW1), second contactor (SW2), the first current-limiting inductance (L1), the second current-limiting inductance (L2) and the test product being sequentially connected in series, the first contactor (SW1) and test product are connected to power supply (DC) and form loop, storage capacitor (C) is parallel with loop between the first contactor (SW1) and second contactor (SW2), rectification circuit is parallel with the loop between first current-limiting inductance (L1) and the second current-limiting inductance (L2)；The dc source (DC), first contactor (SW1), second contactor (SW2), rectification circuit and test product are connected to control system, and the test product is flexible direct-current transmission valve section or valve cell.
Description
Technical field
The present invention relates to flexible DC power transmission to test field, and in particular to a kind of flexible direct-current transmission valve section short-circuit test is surveyed
Test system and its method of testing.
Background technology
In recent years, being continuously increased with demands such as Power System Interconnection, new energy access, city dilatations, flexible DC power transmission
The advantage of itself is increasingly shown compared to Traditional DC transmission of electricity：In the absence of reactive-load compensation and commutation failure problem, can independently adjust
Active and reactive power is saved, harmonics level is low, and floor space is small etc..But there is also some shortcomings, one clearly disadvantageous to be exactly
Do not possess DC side failure self-cleaning ability, when short trouble occurs for flexible DC power transmission DC side, even if IGBT is all closed
It is disconnected, current conversion station by with IGBT anti-paralleled diodes, still can be to trouble point feed-in electric current.To solve the problem, flexible direct current
Current way of transmitting electricity is：Increase SCR at each valve cell outlet both ends, and IGBT diodes in parallel, so since, in direct current
When short trouble occurs for side, system can carry out rapidly sealing ripple unlatching SCR to IGBT, and send prime breaker open command, by
Being disconnected in prime breaker needs the long period (generally in 100ms or so), and during this period, AC can pass through SCR and IGBT
Anti- and diode, short circuit current is injected into failure side, due to the stronger through-current capabilities of SCR, so as to ensure that itself and IGBT
It will not be damaged during anti-and shorted diode.
In order to ensure during dc-side short-circuit, the reliability of SCR and the anti-simultaneously diodes of IGBT, it is necessary to valve section or valve list
Member is tested.Traditional method of testing is mainly by the way of generating set injects high current to test product, though this method
Right implementation method is simple, but during due to flexible DC power transmission dc bus short circuit, its electric current is DC component and AC compounent
Superposition, using this method it is difficult to simulate truth, and by the way of soft straight back-to-back system (CCC-0) directly simulates short-circuit test, though
Energy real simulation short circuit current, but the problem of cost excessive risk is big is faced, therefore, it is defeated to adapt to flexible direct current for urgent need one kind at present
Electric valve section short-circuit test test system, the system need to possess the features such as simple and reliable, energy real simulation is actual.
The content of the invention
In order to solve the problems of the prior art, the present invention proposes a kind of low cost, and high reliability, electric current is flexibly controllable,
The flexible direct-current transmission valve section short-circuit test test system and its method of testing of energy real simulation actual conditions.
In order to realize the above object the technical solution adopted in the present invention is：
A kind of flexible direct-current transmission valve section short-circuit test test system, including be sequentially connected in series first contactor, second connect
Tentaculum, the first current-limiting inductance, the second current-limiting inductance and test product, first contactor are connected to the positive pole of dc source, and described first
Storage capacitor is provided between the negative pole of the node and dc source of contactor and second contactor；First current-limiting inductance and
Rectification circuit is provided between the node of second current-limiting inductance and the negative pole of dc source；Described test product one end is connected to the second limit
Flow inductance, the test product other end is connected to rectification circuit, the dc source, first contactor, second contactor, rectification circuit and
The control terminal of test product is connected to control system, and the test product is flexible direct-current transmission valve section or valve cell.
Current-limiting resistance is in series between the first contactor and second contactor, described storage capacitor one end is connected to limit
Between leakage resistance and second contactor, the storage capacitor other end is connected to the negative pole of dc source.
On the storage capacitor and it is connected to discharge resistance.
The rectification circuit is single phase full bridge controlled rectifier.
The control system includes dsp chip, master control borad, communication board, fibre optic plate and host computer, in running, master control
Plate and communication board realize issuing and receiving for instruction, and communication board is realized online logical by fibre optic plate and telecommunication optical fiber with test product
Letter, so as to reach test platform logic control and the control of short circuit current waveform, the test product during ipc monitor experiment is held
The voltage x current stress and thermal stress received.
A kind of method of testing of flexible direct-current transmission valve section short-circuit test system, comprises the following steps：
1) electricity during flexible direct current power transmission system dc bus short circuit is drawn according to flexible direct current power transmission system parameter, emulation
Flow waveform parameter；
2) flexible direct-current transmission valve section or valve cell leading-out terminal are connected to shape between the second current-limiting inductance and power cathode
Test platform control system is connected into loop, and by the control panel telecommunication optical fiber of valve cell；
3) test system is started, the current waveform parameter that step 1) is emulated to gained is inputted to control system, control system
First according to the magnitude of voltage of current waveform state modulator dc source；Then control system control first contactor is closed to energy storage
Electric capacity charges, and after storage capacitor charging complete, control system control first contactor disconnects second contactor closure, storage capacitor
Self-oscillation produces alternating current between the first current-limiting inductance；Last control system control rectification circuit phase angle, and control soft
The turn on thyristors time of property direct-current transmission valve section or valve cell, thyristor driver make alternating current be flowed through from IGCT,
The alternating current produces direct-current component, direct-current component and alternating current component in the presence of the second current-limiting inductance
It is overlapped, so as to obtain required current waveform；
4) voltage x current that the flexible direct-current transmission valve section in control system record experimentation or valve cell are born should
Power and thermal stress, shutdown test system, complete method of testing.
Current waveform parameter in the step 1) during emulation flexible direct current power transmission system dc bus short circuit includes following
Step：
1) calculate flexible direct current power transmission system systematic parameter, including Transformer Short Circuit Impedance, bridge arm inductance, bus capacitor,
Busbar voltage and rated current；
2) the back-to-back simulation model of flexible direct current power transmission system is established；
3) after system is fully loaded with stable operation, the bipolar short trouble of dc bus, test rectification, inversion and idle three kinds are triggered
Bridgc arm short electric current under operating mode, the peak value of short maximum under three kinds of operating modes is taken as desired value.
Current waveform parameter in the step 1) during the flexible direct current power transmission system dc bus short circuit of emulation includes electricity
Flow frequency, peak value, virtual value, DC component, AC compounent, failure response time and the prime breaker opening times of waveform.
After test system is closed in the step 4), using on storage capacitor and the second current-limiting resistance for connecing is to storage capacitor
Discharged.
Compared with prior art, system of the invention provides energy by dc source and supplied, first contactor and second
Contactor is used for closure and the disconnection of discharge loop, and the starting of control short circuit current and termination；Storage capacitor utilizes direct current
After the charging of source in addition to short circuit energy is provided to rear class, main effect is to form self-oscillation with the first current-limiting inductance, so as to produce
Raw AC power frequency electric current；Rectification circuit is controlled by the change at phase angle to output current；Second current-limiting inductance can be rear
Required DC component is produced in level output current, being superimposed for DC component and AC compounent is showed, can preferably simulate short
Actual current during road；Control system mainly completes the voltage adjustment of controllable DC sources, the break-make of contactor, controlled rectification current phase
Angle controls, the function such as voltage, electric current and Thermal test data acquisition of measured power module.Compared to using generating set to test product
Traditional short-circuit test method of high current is injected, the storage capacitor that prime of the present invention uses, the mother of valve cell in itself can be used
Line capacitance realizes that cost is relatively low；And short-circuit test system of the present invention can be by changing main devices parameter, adjustment electric current frequency
Rate.By changing controlled rectification circuit phase angle, the amplitude of output current is adjusted, and required DC component can be produced, and it is soft
Property DC transmission system busbar short-circuit when, short circuit current except cross AC compounent in addition to, also can containing certain DC component, the present invention
Current waveform during real simulation flexible direct current power transmission system busbar short-circuit, there is low cost, high reliability and electric current flexibly may be used
The advantages of control.
Further, dc source is charged by the first current-limiting resistance to storage capacitor, is advantageous to protect storage capacitor, is improved
The stability of whole system.
Further, after off-test, when closing short-circuit test system, discharge resistance can be put to storage capacitor
Electricity, whole system is further protected, improve the stability of whole system.
According to the current waveform parameter during flexible direct current power transmission system dc bus short circuit of emulation in the method for the present invention,
Direct current power source voltage value, contactor closure or disconnection, rectification circuit phase angle and product to be tested are automatically controlled using control system
The turn on thyristors time, between storage capacitor and the first current-limiting inductance self-oscillation produce alternating current, thyristor driver enables
Short circuit current is set to be flowed through from IGCT, short circuit current produces direct-current component, by changing in the presence of the second current-limiting inductance
Become controlled rectification circuit phase angle, direct current component value can be adjusted, direct-current component is folded with alternating current component
Add, so as to obtain required current waveform, during flexible direct current power transmission system busbar short-circuit, short circuit current in addition to AC compounent is crossed,
Also contain certain DC component, the inventive method can real simulation flexible direct current power transmission system busbar short-circuit when current wave
Shape.
Brief description of the drawings
Fig. 1 is the electrical block diagram of present system.
Embodiment
The present invention is further explained with reference to specific embodiment and Figure of description.
Referring to Fig. 1, system of the invention includes the first contactor SW1, second contactor SW2, the first limit being sequentially connected in series
Inductance L1, the second current-limiting inductance L2 and test product are flowed, first contactor SW1 and test product are connected to power supply DC and form loop, and first connects
Tentaculum SW1 is connected to the node and dc source DC of dc source DC positive pole, first contactor SW1 and second contactor SW2
Negative pole between node and dc source DC provided with storage capacitor C, the first current-limiting inductance L1 and the second current-limiting inductance L2
Negative pole between be provided with rectification circuit；The dc source DC, first contactor SW1, second contactor SW2, rectification circuit and
Test product is connected to control system, and test product is flexible direct-current transmission valve section or valve cell.First contactor SW1 and second contactor
Current-limiting resistance R1 is in series between SW2, storage capacitor C one end is connected on current-limiting resistance R1 and second contactor SW2 node,
Other end connection dc source DC negative pole, on storage capacitor C and it is connected to discharge resistance R2.Rectification circuit is that single-phase bridge is controlled entirely
Rectification circuit；Control system includes dsp chip, master control borad, communication board, fibre optic plate and host computer, in running, master control borad with
What communication board realization instructed issues and receives, and communication board realizes online communication by fibre optic plate and telecommunication optical fiber with test product, from
And reach test platform logic control and the control of short circuit current waveform, ipc monitor measured signal.
The method of testing of the present invention, comprises the following steps：
1) electricity during flexible direct current power transmission system dc bus short circuit is drawn according to flexible direct current power transmission system parameter, emulation
Waveform parameter is flowed, current waveform parameter includes frequency, peak value, virtual value, DC component, AC compounent, the failure of current waveform
Response time and prime breaker opening times；
2) flexible direct-current transmission valve section or valve cell leading-out terminal are connected into the second current-limiting inductance L2 and dc source DC negative poles
Loop is formed, and the control panel telecommunication optical fiber of flexible direct-current transmission valve section or valve cell is connected to test platform control system；
3) test system is started, the current waveform parameter that step 1) is emulated to gained is inputted to control system, control system
First according to current waveform state modulator dc source DC magnitude of voltage；Then control system control first contactor SW1 closures
Charged to storage capacitor C, after storage capacitor C charging completes, control system control first contactor SW1 disconnects second contactor
SW2 is closed, self-oscillation generation alternating current between storage capacitor C and the first current-limiting inductance L1；Last control system control rectification
Current phase angle, and the turn on thyristors time of flexible direct-current transmission valve section or valve cell is controlled, thyristor driver makes friendship
Stream electric current flows through from IGCT, and the alternating current produces direct-current component, direct current in the presence of the second current-limiting inductance L2
Flow component is overlapped with alternating current component, so as to obtain required current waveform；
4) voltage x current that the flexible direct-current transmission valve section in control system record experimentation or valve cell are born should
Power and thermal stress, shutdown test system, method of testing is completed, after test system is closed, utilizes storage capacitor C and second contactor
Between SW2 on loop and the discharge resistance R2 that connects discharges storage capacitor C.
Current waveform parameter in step 1) during emulation flexible direct current power transmission system dc bus short circuit comprises the following steps：
1) flexible direct current power transmission system systematic parameter, including Transformer Short Circuit Impedance, bridge arm inductance, bus capacitor, busbar voltage are calculated
And rated current；2) the back-to-back simulation model of flexible direct current power transmission system is established using PSCAD softwares；3) the fully loaded stable fortune of system
After row, the bipolar short trouble of dc bus is triggered, the bridgc arm short electric current tested under rectification, inversion and idle three kinds of operating modes, is taken
Peak value of short maximum under three kinds of operating modes is as desired value.
The present invention produces alternating current using storage capacitor C and the first current-limiting inductance L1 self-oscillation, straight by controlling
Power supply DC voltage and the phase angle of rectification circuit are flowed, the peak value, virtual value, DC component of output current is controlled and exchanges point
Amount, so as to obtain required short circuit current waveform.The present invention system form mainly by dc source DC, first contactor SW1,
Second contactor SW2, storage capacitor C, the first current-limiting inductance L1, the second current-limiting inductance L2, rectification circuit and control system composition.
Dc source DC mainly completes the energy supply of platform.First contactor SW1 and second contactor SW2 are mainly used in discharge loop
Closure and disconnection, control short circuit current starting and terminate.Storage capacitor C to rear class in addition to short circuit energy is provided, main work
With being to be formed to vibrate with the first current-limiting inductance L1, power current is produced.Rectification circuit is by the change at phase angle to output current
It is controlled.Current-limiting inductance plays filtering and metering function in the loop, wherein the first current-limiting inductance L1 and storage capacitor C in combination,
Formed with damped oscillation, the second current-limiting inductance L2 can produce required DC component in rear class output current.Control system master
Complete the voltage adjustment of dc source, the break-make of contactor, rectified current phase control and measured power module voltage,
The function such as electric current and Thermal test data acquisition；The product to be tested of the present invention is relatively flexible, if can be single valve section or dryvalve
Section series connection or valve cell.
The present invention, so as to produce alternating current, is such as schemed using the self-oscillation between storage capacitor C and the first current-limiting inductance L1
Shown in 1, after control system control SW1 closures, controllable DC sources are charged by current-limiting resistance R1 to storage capacitor.After charging complete,
Control system control first contactor SW1 disconnects, second contactor SW2 closures, and rectified current is begun to flow through electric current, passes through
After the delay of certain time (the soft lineal system busbar short-circuit failure response time of specific time reference), control system makes product to be tested
Thyristor driver enable so that most of short circuit current flows through from IGCT, electric current now is in the second current-limiting inductance L2
In the presence of, being superimposed for DC component and AC compounent is showed, can preferably simulate actual current during short circuit.Pass through control
Dc source DC voltage, the peak value of short circuit current can be changed, by controlling the phase angle of rectification circuit, can control short circuit current
DC component, AC compounent and virtual value.Dc source DC is charged by current-limiting resistance R1 to storage capacitor C, discharge resistance R2
Storage capacitor C is discharged after being mainly used in off-test.
The method of testing of the present invention is as follows：
(1) according to flexible direct current power transmission system parameter, emulation draws current waveform during soft lineal system dc bus short circuit；
(2) flexible direct-current transmission valve section or valve cell are placed in position shown in Fig. 1, can by test product leading-out terminal and test system
By connection；
(3) test platform is started, will be obtained by emulation when the frequency of waveform, peak value, virtual value, DC component, failure response
Between, the parameter input control system such as breaker opening times backstage, control system can automatically control direct current power source voltage value accordingly,
Contactor closes or disconnection, rectification circuit phase angle and product to be tested turn on thyristors time, so as to obtain required electric current
Waveform；
(4) after off-test, during control system backstage can record short-circuit test, the voltage x current that test product is born should
Power and thermal stress, so as to can determine whether test product meets design requirement.
Principle that embodiment of above is intended to be merely illustrative of the present and the illustrative embodiments used, but this hair
It is bright to be not limited thereto.For those skilled in the art, the feelings of spirit and substance of the present invention are not being departed from
Under condition, various changes and modifications can be made therein, and these variations and modifications are also considered as protection scope of the present invention.
Claims (8)
1. a kind of flexible direct-current transmission valve section short-circuit test test system, it is characterised in that including the first contact being sequentially connected in series
Device (SW1), second contactor (SW2), the first current-limiting inductance (L1), the second current-limiting inductance (L2) and test product, first contactor
(SW1) be connected to dc source (DC) positive pole, the node of the first contactor (SW1) and second contactor (SW2) with it is straight
Storage capacitor (C) is provided between the negative pole of stream power supply (DC)；First current-limiting inductance (L1) and the second current-limiting inductance (L2)
Node and dc source (DC) negative pole between be provided with rectification circuit；Described test product one end is connected to the second current-limiting inductance
(L2), the test product other end is connected to rectification circuit, the dc source (DC), first contactor (SW1), second contactor
(SW2), the control terminal of rectification circuit and test product is connected to control system, and the test product is flexible direct-current transmission valve section or valve list
Member.
2. a kind of flexible direct-current transmission valve section short-circuit test test system according to claim 1, it is characterised in that described
Current-limiting resistance (R1) is in series between first contactor (SW1) and second contactor (SW2), described storage capacitor (C) one end connects
Current-limiting resistance (R1) and the node of second contactor (SW2) are connected to, storage capacitor (C) other end is connected to dc source (DC)
Negative pole.
3. a kind of flexible direct-current transmission valve section short-circuit test test system according to claim 2, it is characterised in that described
On storage capacitor (C) and it is connected to discharge resistance (R2).
4. a kind of flexible direct-current transmission valve section short-circuit test test system according to claim 1, it is characterised in that described
Rectification circuit is single phase full bridge controlled rectifier.
5. a kind of method of testing of the flexible direct-current transmission valve section short-circuit test system described in usage right requirement 1, its feature exist
In comprising the following steps：
1) current wave during flexible direct current power transmission system dc bus short circuit is drawn according to flexible direct current power transmission system parameter, emulation
Shape parameter；
2) flexible direct-current transmission valve section or valve cell leading-out terminal are connected to the second current-limiting inductance (L2) and dc source (DC)
Negative pole forms loop, and the control panel telecommunication optical fiber of flexible direct-current transmission valve section or valve cell is connected into test platform control system
System；
3) test system is started, the current waveform parameter that step 1) is emulated to gained is inputted to control system, and control system is first
According to the magnitude of voltage of current waveform state modulator dc source (DC)；Then control system control first contactor (SW1) closure
Charged to storage capacitor (C), after storage capacitor (C) charging complete, control system control first contactor (SW1) disconnects second and connect
Tentaculum (SW2) closes, self-oscillation generation alternating current between storage capacitor (C) and the first current-limiting inductance (L1)；Finally control system
System control rectification circuit phase angle, and the turn on thyristors time of flexible direct-current transmission valve section or valve cell is controlled, IGCT drives
Dynamic alternating current is flowed through from IGCT, the alternating current produces direct current in the presence of the second current-limiting inductance (L2)
Flow component, direct-current component are overlapped with alternating current component, so as to obtain required current waveform；
4) the flexible direct-current transmission valve section in control system record experimentation or the voltage x current stress that is born of valve cell and
Thermal stress, shutdown test system, complete method of testing.
6. method of testing according to claim 5, it is characterised in that emulation flexible direct current power transmission system in the step 1)
Current waveform parameter during dc bus short circuit comprises the following steps：
1) flexible direct current power transmission system systematic parameter, including Transformer Short Circuit Impedance, bridge arm inductance, bus capacitor, bus are calculated
Voltage and rated current；
2) the back-to-back simulation model of flexible direct current power transmission system is established；
3) after system is fully loaded with stable operation, the bipolar short trouble of dc bus, test rectification, inversion and idle three kinds of operating modes are triggered
Under bridgc arm short electric current, take the peak value of short maximum under three kinds of operating modes as desired value.
7. method of testing according to claim 5, it is characterised in that the flexible DC power transmission system of emulation in the step 1)
Frequency of the current waveform parameter including current waveform during system dc bus short circuit, peak value, virtual value, DC component, exchange point
Amount, failure response time and prime breaker opening times.
8. method of testing according to claim 5, it is characterised in that after test system is closed in the step 4), utilize
On storage capacitor (C) and the discharge resistance (R2) that connects discharges storage capacitor (C).
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| WO2018018467A1 (en) * | 2016-07-27 | 2018-02-01 | 东莞市广安电气检测中心有限公司 | Method for calibrating short circuit test measurement system for electric appliance |
| CN111781544B (en) * | 2020-06-12 | 2023-04-28 | 矽力杰半导体技术(杭州)有限公司 | Energy storage capacitor device and state monitoring circuit thereof |
| CN114257105B (en) * | 2021-11-29 | 2023-07-11 | 南方电网科学研究院有限责任公司 | Method and device for testing effectiveness of through-flow thyristor trigger function of valve control system |
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