CN106646145B - Flexible direct-current transmission converter discharging model and its discharge time fixed value adjusting method - Google Patents
Flexible direct-current transmission converter discharging model and its discharge time fixed value adjusting method Download PDFInfo
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Abstract
The present invention relates to a kind of flexible direct-current transmission converter discharging model and its discharge time fixed value adjusting method, discharging model includes capacitor, parallel resistance, draw-out power supply equivalent resistance, draw-out power supply switch, first diode, the second diode；The draw-out power supply switch control draw-out power supply is switched on or off, and when draw-out power supply is opened, capacitor is discharged jointly by parallel resistance, draw-out power supply；After draw-out power supply shutdown, capacitor is discharged by parallel resistance.Draw-out power supply is in opening state when stoppage in transit, and segmentation calculates the time discharged jointly by parallel resistance, draw-out power supply, the time only discharged by parallel resistance, two sections of temporal summations obtain inverter discharge time；Draw-out power supply is in an off state when stoppage in transit, calculates the discharge time only discharged by parallel resistance.The present invention provides theoretical foundation and technical support by flexible direct-current transmission converter discharging model and discharge time fixed value adjusting method for analysis inverter discharge process relay protection constant value related to adjusting.
Description
Technical field
The present invention relates to flexible DC transmission technology fields, more particularly to a kind of flexible direct-current transmission converter electric discharge mould
Type and its discharge time fixed value adjusting method.
Background technique
Inverter stoppage in transit is one of the key state during flexible DC transmission engineering O&M, including is normally stopped transport, event
Hinder the various ways such as stoppage in transit, emergency outage.Inverter reversely ends since submodule IGBT is latched with diode after stopping transport, submodule
Block capacitance voltage cannot discharge rapidly, can only slowly be discharged by parallel resistance etc..Since capacitor residual voltage is excessive, discharged
Valve hall access control system should be at blocking in journey, and operation maintenance personnel is forbidden to enter.Discharge time is directly related to valve hall gate inhibition and closes
Time and capacitor residual voltage size are locked, needs to obtain the relationship of time and capacitance voltage in discharge process, it is final to determine electric discharge
Time definite value.Inverter discharge time calculated result and actual deviation are larger in research at present, it is therefore necessary to establish flexible straight
Stream current transmission device discharging model simultaneously proposes discharge time fixed value adjusting method, phase during stopping transport for flexible DC transmission engineering
It closes relay protection fixed value setting and theoretical foundation and technical support is provided.
In the correlative study of the process of inverter stoppage in transit at present, it is concentrated mainly on design bridge arm discharge resistance and submodule is in parallel
Two aspects of resistance.Bridge arm discharge resistance is placed between bridge arm, is opened in electric discharge as discharge channel；Submodule electricity in parallel
Hinder it is in parallel with capacitor, inverter starting when serve pressure, inverter stop transport after be used as discharge resistance use.Such as document
" start-up and shut-down control of modular multilevel converter type direct current transmission system ", " the shutdown plan that MMC-HVDC powers to passive network
The electric discharge of submodule capacitor slightly " etc. is realized by the investment of discharge resistance in bridge arm, but since voltage is lower than after a certain threshold values
Submodule IGBT locking and diode reversely end, and keep voltage complete from discharging by the discharge resistance in bridge arm.And it is such
Research has ignored the discharge process of parallel resistance, and guiding discharge time error calculated is larger, and there is no practical applications at present
Case.Have the literature research discharge process of parallel resistance, such as " modular multilevel converter type HVDC transmission system
The research of stoppage in transit control strategy " putting for equalizing resistance in the uncontrollable energy dissipation stage is described when analyzing inverter stoppage in transit process
Electro ultrafiltration.But existing research has ignored the discharge process of the secondary control loop load of draw-out power supply and its power supply, makes to discharge
Process capacitance voltage change curve and discharge time fixed value calculation resultant error are larger.Draw-out power supply is direct as parallel resistance
Capacitor both ends are connected in parallel on, when draw-out power supply work, draw-out power supply and its load moment consume capacitor electricity, therefore inverter is put
The discharge process of draw-out power supply must be taken into consideration when electric.
Not thorough and discharge time error calculated is studied in view of discharge procedure mechanism after stopping transport at present to inverter
Biggish status, the invention proposes flexible direct-current transmission converter discharging model and discharge time fixed value adjusting methods.The party
Method comprehensively considers the influence of the factors such as draw-out power supply working condition, draw-out power supply equivalent resistance and parallel resistance, illustrates the change of current
The mechanism of device discharge process and the accuracy for improving discharge time fixed value adjusting result.The flexible direct current provided through the invention
Current transmission device discharging model and discharge time fixed value adjusting method are fixed to inverter Discharge process analysis and related relay protection
Value adjusting has great importance.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of flexible direct-current transmission converter discharging model and discharge time are fixed
It is worth setting method, on the one hand the discharging model comprehensively considers draw-out power supply working condition, draw-out power supply equivalent resistance and parallel connection electricity
The influence discharged capacitor is hindered, the mechanism of inverter discharge process is illustrated；On the other hand electric discharge is derived according to discharging model
Time setting formula, the discharge time definite value error after adjusting are smaller.It is through the invention analysis inverter discharge process and whole
Fixed correlation relay protection constant value provides theoretical foundation and technical support.
The present invention is realized using following scheme: a kind of flexible direct-current transmission converter discharging model, including capacitor, electricity in parallel
Resistance, draw-out power supply equivalent resistance, draw-out power supply switch, first diode, the second diode；The cathode of the first diode with
One end of positive, the described parallel resistance of the capacitor, one end of draw-out power supply switch are connected, the draw-out power supply switch
The other end connect with one end of the draw-out power supply equivalent resistance, the other end of the equivalent resistance simultaneously with it is described in parallel electric
The other end of resistance, the cathode of the capacitor, the anode of second diode, the cathode of a submodule are connected, the submodule
Anode is connect with the cathode of the anode of first diode, second diode.
Further, the draw-out power supply switch is automatic switch, when capacitance voltage is greater than draw-out power supply shutdown voltage,
Draw-out power supply switch is open-minded；When capacitance voltage is less than draw-out power supply shutdown voltage, draw-out power supply switch OFF.
The present invention also uses following methods to realize: a kind of discharge time definite value of flexible direct-current transmission converter discharging model
Setting method, specifically includes the following steps:
Step S1: the operating voltage range of submodule before inverter is stopped transport is obtained；
Step S2: it obtains capacitor's capacity, parallel resistance resistance value, draw-out power supply bearing power, draw-out power supply efficiency, take energy electricity
Source turns off the parameters such as voltage；
Step S3: flexible direct-current transmission converter discharging model is established；
Step S4: submodule voltage max judges that draw-out power supply is opened, turns off working condition before being stopped transport according to inverter；
When draw-out power supply is opened, capacitor is discharged jointly by parallel resistance, draw-out power supply；After draw-out power supply shutdown, capacitor passes through parallel connection
Conductive discharge；
Step S5: it when draw-out power supply is opened before inverter is stopped transport, calculates capacitor and is down to from submodule operating voltage maximum value
Draw-out power supply turns off the discharge time 1 when voltage；It calculates when capacitor is down to safe voltage definite value from draw-out power supply shutdown voltage
Discharge time 2；Two sections of discharge time summations, obtain inverter discharge time.
Step S6: before inverter is stopped transport when draw-out power supply shutdown, capacitor submodule voltage max drop before stopping transport is calculated
Discharge time when to safe voltage definite value, obtain inverter discharge time.
Further, the discharge time of the inverter adjusts according to the maximum working voltage before submodule stoppage in transit.
Further, when maximum working voltage is greater than draw-out power supply shutdown voltage before the submodule is stopped transport, taking can electricity
Source switch is open-minded, and draw-out power supply is in running order, and capacitor is discharged together by draw-out power supply equivalent resistance and parallel resistance, this
The stage discharge time are as follows:
η is draw-out power supply efficiency in formula, and R is parallel resistance resistance value, and C is capacitor's capacity, and P is draw-out power supply load, and U is electricity
Hold voltage, UNMaximum working voltage before stopping transport for submodule, UoffThreshold voltage is turned off for draw-out power supply.
Further, as submodule capacitor voltage reduces, when lower than draw-out power supply shutdown voltage, draw-out power supply switch
Shutdown, draw-out power supply is in an off state, and capacitor continues through parallel resistance electric discharge, until to the capacitance voltage for meeting safety requirements
Safe threshold, this stage discharge time are as follows:
U in formula0For submodule capacitor voltage safe threshold.
Discharge time is the sum of time two stages at this time:
T=t1+t2
When maximum working voltage is lower than draw-out power supply shutdown voltage before submodule is stopped transport, draw-out power supply is constantly in shutdown
State, capacitor are discharged by parallel resistance, discharge time are as follows:
Compared with prior art, flexible direct-current transmission converter discharging model proposed by the present invention and its discharge time definite value
Setting method comprehensively considers the factors such as draw-out power supply working condition, draw-out power supply equivalent resistance and parallel resistance.Draw-out power supply is opened
When logical, capacitor is discharged jointly by parallel resistance, draw-out power supply；After draw-out power supply shutdown, capacitor is only discharged by parallel resistance.
Discharge time fixed value adjusting method keeps discharge time calculated result and engineering actually almost the same, method particularly includes: inverter stops
Draw-out power supply is in opening state when fortune, and segmentation calculates the time 1 discharged jointly by parallel resistance, draw-out power supply, calculates only
Inverter discharge time is obtained by 2, two sections of temporal summations of time that parallel resistance is discharged；When inverter is stopped transport at draw-out power supply
In off state, the discharge time only discharged by parallel resistance is calculated.The flexible DC transmission change of current provided through the invention
Related relay protection is fixed during device discharging model and discharge time fixed value adjusting method can stop transport for flexible DC transmission engineering
Value adjusting provides theoretical foundation and technical support, illustrates inverter discharge mechanism, improves the calculating essence of discharge time definite value
Degree.
Detailed description of the invention
Fig. 1 is flexible direct-current transmission converter discharging model of the present invention.
Fig. 2 is the relational graph of discharge time Yu capacitor residual voltage.
Fig. 3 is discharge time fixed value adjusting method flow diagram.
Fig. 4 is that different safe voltages require lower time definite value of discharging.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
The present embodiment provides a kind of flexible direct-current transmission converter discharging models, as shown in Figure 1, including capacitor, electricity in parallel
Resistance, draw-out power supply equivalent resistance, draw-out power supply switch, first diode, the second diode；The cathode of the first diode with
One end of positive, the described parallel resistance of the capacitor, one end of draw-out power supply switch are connected, the draw-out power supply switch
The other end connect with one end of the draw-out power supply equivalent resistance, the other end of the equivalent resistance simultaneously with it is described in parallel electric
The other end of resistance, the cathode of the capacitor, the anode of second diode, the cathode of a submodule are connected, the submodule
Anode is connect with the cathode of the anode of first diode, second diode.
In the present embodiment, the draw-out power supply switch is automatic switch, when capacitance voltage is greater than draw-out power supply shutdown electricity
When pressure, draw-out power supply switch is open-minded；When capacitance voltage is less than draw-out power supply shutdown voltage, draw-out power supply switch OFF.
In the present embodiment, after inverter is stopped transport, since reversely cut-off acts on diode, submodule capacitor can only be by interior
The parallel resistance or draw-out power supply in portion are discharged.Therefore the discharge process of inverter is exactly the discharge process of single submodule.
Discharge time should be calculated according to submodule maximum working voltage when stopping transport.
In the present embodiment, draw-out power supply switch is automatic switch in Fig. 1, and when stopping transport, submodule maximum working voltage is big
When draw-out power supply turns off voltage, draw-out power supply switch is open-minded, and capacitor passes through draw-out power supply equivalent resistance and parallel resistance at this time
It discharges, is known according to Kirchhoff's current law (KCL) together, flow out the electric current of capacitor are as follows:
I=i1+i2
I in formula1It is the electric current by parallel resistance, i2It is the electric current by draw-out power supply, i is the electric current for flowing out capacitor.
Parallel resistance resistance value is fixed value, is by the electric current of parallel resistance,
R is parallel resistance resistance value in formula, and U is capacitance voltage.
Draw-out power supply equivalent resistance is variable, but the power of draw-out power supply load is fixed value, therefore passes through draw-out power supply
Electric current be,
P is draw-out power supply load in formula, and η is draw-out power supply efficiency,
Outflow capacitor electric current be
Within the unit time, the relationship of capacitance voltage variable quantity and electric current is,
C is capacitor's capacity in formula.
Definite integral processing is carried out to formula in submodule maximum working voltage to draw-out power supply shutdown voltage range,
After voltage change section negates, this stage discharge time is obtained are as follows:
U in formulaNMaximum working voltage before stopping transport for submodule, UoffThreshold voltage is turned off for draw-out power supply.
As submodule capacitor voltage reduces, when lower than draw-out power supply shutdown voltage, draw-out power supply switch OFF takes energy
Power supply is in an off state.Capacitor continues through parallel resistance electric discharge, until to the capacitance voltage safe threshold for meeting safety requirements.
Known at this time according to Kirchhoff's current law (KCL), flow out the electric current of capacitor are as follows:
Definite integral is carried out to it to handle to obtain this stage discharge time are as follows:
U in formula0For submodule capacitor voltage safe threshold.
Discharge time is the sum of time two stages at this time:
T=t1+t2
When stopping transport, submodule maximum working voltage is lower than draw-out power supply shutdown voltage, draw-out power supply is constantly in shutdown
State, capacitor is only discharged by parallel resistance at this time, flows out the electric current of capacitor are as follows:
Definite integral is carried out to it to handle to obtain discharge time are as follows:
Discharge time is calculated according to above formula and the relationship of capacitor residual voltage is as shown in Figure 2, it is seen that submodule
When voltage is larger, discharge process is divided into two stages.First stage due to being discharged jointly by parallel resistance and draw-out power supply, puts
Electric fast speed.And the discharge process of existing research only includes second stage, guiding discharge time error is larger.Therefore pass through this
The flexible direct current inverter discharging model of invention can illustrate inverter discharge mechanism, keep capacitance voltage change procedure and engineering practical
It is consistent.
Therefore, in the present embodiment, not according to submodule maximum working voltage, draw-out power supply working condition when stopping transport
Together, the discharge time fixed value adjusting method of flexible direct-current transmission converter discharging model, specifically includes the following steps:
Step S1: the operating voltage range of submodule before inverter is stopped transport is obtained；
Step S2: it obtains capacitor's capacity, parallel resistance resistance value, draw-out power supply bearing power, draw-out power supply efficiency, take energy electricity
Source turns off the parameters such as voltage；
Step S3: flexible direct-current transmission converter discharging model is established；
Step S4: submodule voltage max judges that draw-out power supply is opened, turns off working condition before being stopped transport according to inverter；
When draw-out power supply is opened, capacitor is discharged jointly by parallel resistance, draw-out power supply；After draw-out power supply shutdown, capacitor passes through parallel connection
Conductive discharge；
Step S5: it when draw-out power supply is opened before inverter is stopped transport, calculates capacitor and is down to from submodule operating voltage maximum value
Draw-out power supply turns off the discharge time 1 when voltage；It calculates when capacitor is down to safe voltage definite value from draw-out power supply shutdown voltage
Discharge time 2；Two sections of discharge time summations, obtain inverter discharge time.
Step S6: before inverter is stopped transport when draw-out power supply shutdown, capacitor submodule voltage max drop before stopping transport is calculated
Discharge time when to safe voltage definite value, obtain inverter discharge time.
In the present embodiment, since safe voltage definite value is different, discharge time needed for inverter is different.Different safety are set
Voltage definite value obtains corresponding discharge time according to discharge time adjusting flow simulation in Fig. 3.As a result as shown in Figure 4, it is seen that peace
Full voltage is lower, discharge time definite value Ying Yue great.Discharge time definite value in Fig. 4, can be fixed for valve hall access control system blocking time
The specific data of offers and the theoretical foundations such as value adjusting, emergency outage test.
Flexible direct-current transmission converter discharging model proposed by the present invention and discharge time fixed value adjusting method, comprehensively consider
The factors such as draw-out power supply working condition, draw-out power supply equivalent resistance and parallel resistance.When draw-out power supply is opened, capacitor passes through parallel connection
Resistance, draw-out power supply discharge jointly；After draw-out power supply shutdown, capacitor is only discharged by parallel resistance.Discharge time fixed value adjusting
Method keeps discharge time calculated result and engineering actually almost the same, method particularly includes: draw-out power supply is in when inverter is stopped transport
Opening state, segmentation calculate the time 1 discharged jointly by parallel resistance, draw-out power supply, calculate and only discharged by parallel resistance
2, two sections of temporal summations of time obtain inverter discharge time；Draw-out power supply is in an off state when inverter is stopped transport, and calculates
The discharge time only discharged by parallel resistance.The flexible direct-current transmission converter discharging model provided through the invention and electric discharge
Time definite value setting method illustrates inverter discharge process, improves the computational accuracy of discharge time definite value, stops to inverter
Fortune process correlation relay protection fixed value setting has great importance.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (5)
1. a kind of discharge time fixed value adjusting method of flexible direct-current transmission converter discharging model, it is characterised in that: provide one
Flexible direct-current transmission converter discharging model, the flexible direct-current transmission converter discharging model include capacitor, parallel resistance, take
It can power supply equivalent resistance, draw-out power supply switch, first diode, the second diode；The cathode of the first diode with it is described
One end of positive, the described parallel resistance of capacitor, one end of draw-out power supply switch are connected, and the draw-out power supply switchs another
One end is connect with one end of the draw-out power supply equivalent resistance, the other end of the equivalent resistance simultaneously with the parallel resistance
The other end, the cathode of the capacitor, the anode of second diode, the cathode of a submodule are connected, the submodule anode
It is connect with the cathode of the anode of first diode, second diode；
Specifically includes the following steps:
Step S1: the operating voltage range of submodule before inverter is stopped transport is obtained；
Step S2: capacitor's capacity, parallel resistance resistance value, draw-out power supply bearing power, draw-out power supply efficiency, draw-out power supply are obtained and is closed
Disconnected voltage parameter；
Step S3: flexible direct-current transmission converter discharging model is established；
Step S4: submodule voltage max judges that draw-out power supply is opened, turns off working condition before being stopped transport according to inverter；Take energy
When power supply is opened, capacitor is discharged jointly by parallel resistance, draw-out power supply；After draw-out power supply shutdown, capacitor passes through parallel resistance
Electric discharge；
Step S5: when draw-out power supply is opened before inverter is stopped transport, calculating capacitor is down to from submodule operating voltage maximum value takes energy
The first discharge time when power remove voltage；Calculate the when capacitor is down to safe voltage definite value from draw-out power supply shutdown voltage
Two discharge times；Two sections of discharge time summations, obtain inverter discharge time；
Step S6: it before inverter is stopped transport when draw-out power supply shutdown, calculates capacitor submodule voltage max before stopping transport and is down to peace
Discharge time when full voltage definite value obtains inverter discharge time.
2. a kind of discharge time fixed value adjusting side of flexible direct-current transmission converter discharging model according to claim 1
Method, it is characterised in that: the draw-out power supply switch is automatic switch, when capacitance voltage is greater than draw-out power supply shutdown voltage, is taken
Energy power switch is open-minded；When capacitance voltage is less than draw-out power supply shutdown voltage, draw-out power supply switch OFF.
3. a kind of discharge time fixed value adjusting side of flexible direct-current transmission converter discharging model according to claim 1
Method, it is characterised in that: the discharge time of the inverter adjusts according to the maximum working voltage before submodule stoppage in transit.
4. a kind of discharge time fixed value adjusting of flexible direct-current transmission converter discharging model according to claim 1 or 3
Method, it is characterised in that: when maximum working voltage is greater than draw-out power supply shutdown voltage before the submodule is stopped transport, draw-out power supply
Switch open-minded, draw-out power supply is in running order, and capacitor is discharged together by draw-out power supply equivalent resistance and parallel resistance, this rank
Section discharge time are as follows:
η is draw-out power supply efficiency in formula, and R is parallel resistance resistance value, and C is capacitor's capacity, and P is draw-out power supply load, and U is capacitor electricity
Pressure, UNMaximum working voltage before stopping transport for submodule, UoffThreshold voltage is turned off for draw-out power supply；
As submodule capacitor voltage reduces, when lower than draw-out power supply shutdown voltage, draw-out power supply switch OFF, draw-out power supply
In an off state, capacitor continues through parallel resistance electric discharge, until to the capacitance voltage safe threshold for meeting safety requirements, this rank
Section discharge time are as follows:
U in formula0For submodule capacitor voltage safe threshold；
Discharge time is the sum of time two stages at this time:
T=t1+t2。
5. a kind of discharge time fixed value adjusting of flexible direct-current transmission converter discharging model according to claim 1 or 3
Method, it is characterised in that: when maximum working voltage is lower than draw-out power supply shutdown voltage before submodule is stopped transport, draw-out power supply is always
In an off state, capacitor is discharged by parallel resistance, discharge time are as follows:
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