CN106058826B - A kind of mixed type DC transmission system receiving end exchange side fault handling method - Google Patents
A kind of mixed type DC transmission system receiving end exchange side fault handling method Download PDFInfo
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- CN106058826B CN106058826B CN201610393632.8A CN201610393632A CN106058826B CN 106058826 B CN106058826 B CN 106058826B CN 201610393632 A CN201610393632 A CN 201610393632A CN 106058826 B CN106058826 B CN 106058826B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a kind of mixed type DC transmission system receiving end exchange side fault handling methods, which is characterized in that includes the following steps：Whether step 1, detection receiving end AC network occur catastrophe failure, 2 are entered step if catastrophe failure occurs, catastrophe failure refers to the failure for making inversion current conversion station be less than 0.6 times of rated voltage with alternating current net junction positive sequence voltage occurred in receiving end power grid；Step 2, rectification current conversion station phase shift to inverter mode adjust rectification side thyristor valves Trigger Angle and are more than 90 degree of operations；The straight-through operation of single-phase valve in step 3, inversion current conversion station voltage source converter triggering three-phase, while being latched other two-phase valve.The present invention can ensure that mixed type DC transmission system reliably and securely passes through the catastrophe failure of inverter side AC network, limit the overvoltage and DC side overvoltage of voltage source converter internal capacitance, after AC network fault clearance, mixed type DC transmission system can quickly, smoothly resume operation.
Description
Technical field
The present invention relates to a kind of mixed type DC transmission system receiving end exchange side fault handling methods.
Background technology
HVDC transmission system can be divided into two types：Customary DC transmission system (LCC- based on thyristor technology
HVDC) and the flexible direct current power transmission system based on all-controlling power electronics device technology (Flexible-HVDC), the two respectively has
Advantage and disadvantage, therefore combine the Hybrid HVDC system of customary DC transmission of electricity and flexible DC power transmission will be with before engineer application
Scape, has both that customary DC transmission losses is small, running technology is ripe and flexible DC power transmission can power, no to passive network
The advantages of commutation failure can occur.
But when the AC network that Hybrid HVDC system inverter side (i.e. receiving end) voltage source converter is connected is sent out
When raw catastrophe failure, alternating voltage falls seriously, inverter side transverter exchange side power output critical constraints, and the rectification side change of current
Device conveys dc power still according to set value and power reference to inverter side, and inverter side voltage source converter DC side is defeated at this time
Enter power and be much larger than exchange side output power, power difference leads to voltage source converter inside, and energy-storage travelling wave tube --- capacitance is serious
Overvoltage also will appear seriously mistake simultaneously as voltage source converter DC voltage is the sum of the voltage of internal several capacitances
Voltage.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of mixed type DC transmission system receiving end exchange side fault handling method,
It can ensure that mixed type DC transmission system reliably and securely passes through the catastrophe failure of inverter side AC network, limit voltage source
The overvoltage and DC side overvoltage of inverter inside capacitance, after AC network fault clearance, mixed type DC transmission system
It can quickly, smoothly resume operation.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme：
A kind of mixed type DC transmission system receiving end exchange side fault handling method, which is characterized in that include the following steps：
Whether step 1, detection receiving end AC network occur catastrophe failure, and 2 are entered step if catastrophe failure occurs,
In, catastrophe failure refer to occur in receiving end power grid make inversion current conversion station and alternating current net junction positive sequence voltage be less than 0.6 times it is specified
The failure of voltage；
Step 2, rectification current conversion station phase shift to inverter mode adjust rectification side thyristor valves Trigger Angle and are more than 90 degree of fortune
Row；
The straight-through operation of single-phase valve in step 3, inversion current conversion station voltage source converter triggering three-phase valve, while being latched another
Outer two-phase valve.
It is preferred that in step 1, inversion current conversion station utilizes the three-phase alternating voltage U with AC network junctionA、UB、UCIt calculates
Go out UposIf met：Upos≤Uref1, then judge that catastrophe failure occurs for AC network, and by interior communication system to rectification
Side control system sends request phase shift signal；
Wherein, UposFor the positive sequence voltage acquired by three-phase alternating voltage, Uref1For the threshold value of setting.
It is preferred that Uref1For the floating threshold directly proportional to DC current before failure, set using following formula：
Uref1=k*Idcpu*UN
Wherein, IdcpuFor DC current perunit value, U before failureNFor the rated voltage of Inverter Station and AC network junction, k
For proportionality coefficient, generally can value be 0.3~0.6.
Meanwhile in step 1, converting plant utilizes the DC current and voltage of our station, judges whether receiving end AC network occurs
Catastrophe failure then judges that catastrophe failure occurs in inverse receiving end AC network when meeting following formula：
Wherein, UdcRFor rectification current conversion station DC voltage, IdcRFor rectification current conversion station DC current,For DC current
Change rate,For DC voltage change rate, L is DC line inductance, and R is DC line resistance, UdcrefFor setting
Over-pressed threshold value.UdcrefValue is 1.1~1.3 times of DC rated voltage.
In step 1, the detection method of inversion current conversion station is led to dependent between the station between rectification current conversion station and inversion current conversion station
Letter system, the detection method of rectification current conversion station is independent of interior communication system.Any one detection method detects that receiving end is handed over
Stream electric network fault then enters step 2, i.e., rectification current conversion station has received the request phase shift signal of inversion current conversion station, or utilizes our station
DC voltage and current detecting gone out receiving end power grid catastrophe failure, then enter step 2.
In step 2, rectification current conversion station adjusts rectification side thyristor valves Trigger Angle and is more than 90 degree of operations, general desirable
120 degree~164 degree operations.After rectification current conversion station phase shift phase shift run signal is sent to inversion current conversion station.
After inversion current conversion station judges that catastrophe failure occurs for receiving end AC network, the fortune of phase shift of rectification current conversion station is received
Row signal, or the change rate when DC currentSpeedup is more than or equal to setting value, the inversion change of current and stands erectly galvanic electricity stream IdcIAbsolutely
Value is decreased to 0 and IdcIWhen reversed, then 3 are entered step.
In step 3, inversion current conversion station voltage source converter triggers the straight-through operation of any single-phase valve in three-phase valve, simultaneously
It is latched other two-phase valve.
After inversion current conversion station detects that receiving end AC network failure has been removed, revocation triggers the straight-through operation of single-phase valve, inverse
Transform stream station and rectification current conversion station restore the method for operation before failure.Inversion current conversion station utilizes the three-phase with AC network junction
Alternating voltage UA、UB、UCCalculate positive sequence voltage Upos, work as Upos≥Uref2When, judge that receiving end AC network failure has been removed,
In, Uref2For the threshold value of setting, Uref2Take 0.7~0.95 times of AC network rated voltage.
It is preferred that after inversion current conversion station detection failure has been removed, before inversion current conversion station and rectification current conversion station recovery failure
The method of operation：Inversion current conversion station first restores, i.e. revocation triggers the straight-through operation of single-phase valve, restores three-phase unlock, and to the rectification change of current
Transmission of standing has restored three-phase unlock run signal；Rectification current conversion station receives the three-phase of the recovery unlock fortune of inversion current conversion station transmission
Row signal, or detect that DC voltage has restored to 0.5 times or more of rated voltage, it is restored to the rectifier system before failure and touches
It sends out angle and is less than 90 degree of operations.
Inversion current conversion station and rectification current conversion station adjust the operating status before DC voltage and DC current to failure later.
The beneficial effects of the invention are as follows：At a kind of mixed type DC transmission system receiving end exchange side failure
Reason method, wherein no matter converting plant and Inverter Station communication it is whether normal, this method can ensure mixed type DC transmission system
It reliably and securely passes through the catastrophe failure of inverter side AC network, limits the overvoltage of voltage source converter internal capacitance and straight
Side overvoltage is flowed, after AC network fault clearance, mixed type DC transmission system can quickly, smoothly resume operation.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of mixed type DC transmission system of the present invention；
Fig. 2 is 12 pulsation bridge-type thyristor converter device structures and becomes connection diagram with the change of current；
Fig. 3 is MMC type voltage source converter structural schematic diagram；
Fig. 4 is full-bridge sub-modular structure schematic diagram；
Fig. 5 is class full-bridge sub-modular structure schematic diagram；
Fig. 6 is mixed type DC transmission system inverter side fault in ac transmission system processing flow schematic diagram.
Specific implementation mode
Technical solution of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, so that ability
The technical staff in domain can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention
It is fixed.
As shown in Figure 1, mixed type DC transmission system include the rectification current conversion station being connect with sending end AC network and with
The inversion current conversion station of receiving end AC network connection, rectification current conversion station are connect through DC power transmission line with inversion current conversion station.Rectification is changed
It includes converter power transformer, convertor unit and smoothing reactor to flow station, and convertor unit passes through converter power transformer and sending end alternating current
Net connection；Inversion current conversion station includes converter power transformer, convertor unit and smoothing reactor, convertor unit converter power transformer with by
Hold AC network connection.Wherein, UdcR、IdcRFor rectification current conversion station DC voltage and DC current, UdcI、IdcIFor inversion current conversion station
DC voltage and DC current, UA、UB、UCBy the three-phase alternating voltage for the AC network that inversion current conversion station connects, L, R are
The inductance and resistance of DC line.
The converter power transformer of rectification current conversion station is that a mode of connection is Y0The three-winding transformer of/Y/ Δs is connect by two
Line mode is respectively Y0/ Δ and Y0The two-winding transformer of/Y is constituted；The converter power transformer of inversion current conversion station is a mode of connection
For Y0The two-winding transformer of/Δ.The three-phase alternating current that converter power transformer is used to provide AC system carries out voltage class change
It changes, bear DC offset voltage, and play the role of isolated DC bias voltage and enter AC network.
As shown in Fig. 2, 12 pulsation bridge-type thyristor converter devices may be used in the convertor unit of rectification current conversion station, be used for by
The three-phase alternating current of sending end AC network is converted to direct current, and the direct current is delivered to inverse transformation by DC power transmission line
Stream station, the multiple thyristors of each of which bridge arm series connection.
As shown in figure 3, MMC (modularization multi-level converter) may be used in the convertor unit of inversion current conversion station, use
Six bridge arm structure of three-phase, each bridge arm are made of N number of sub-module cascade and concatenate there are one bridge arm reactor, and N is more than 0
Natural number, submodule are not limited to, using a certain topological structure, the son of one or more different topology structures may be used
Module-cascade is constituted.Fig. 4~Fig. 5 lists two kinds of common submodule topological structures, only of the invention specific for convenience of description
Embodiment, the submodule type in Fig. 3 are not limited to both structures.
As shown in figure 4, full-bridge submodule is by four IGBT pipes T1~T4, four diode D1~D4, capacitance C1 and resistance
R1 is constituted, and the base stage of four IGBT pipes T1~T4 receives the control signal of external equipment offer.Full-bridge submodule, which has, (just) to be thrown
Enter, negative input, straight-through, four kinds of operating statuses of locking, correspond to T1, T4 conducting T2, T3 shutdown respectively, T1, T4 shutdown T2, T3 are led
Logical, T2, T4 shutdown is connected in T1, T3 or T1, T3 shutdown T2, T4 conducting, T1~T4 are turned off.
As shown in figure 5, class full-bridge submodule has lacked IGBT pipes T3 compared to full-bridge submodule.Class full-bridge submodule have input,
Straight-through, three kinds of operating statuses of locking correspond to T1, T4 conducting T2 shutdowns respectively, and T1 turns off T2, T4 conducting, and T1, T2, T4 are turned off.
Rectification current conversion station uses constant DC current control, and inversion current conversion station is using constant DC voltage control and determines reactive power
Control.When steady-state operation, DC current and DC voltage are respectively by rectification current conversion station and inversion change of current stand control.Rectification current conversion station
The signal exchange being provided between inversion current conversion station between two stations of interior communication system realization.
As shown in fig. 6, a kind of mixed type DC transmission system receiving end exchange side fault handling method, includes the following steps：
Whether step 1, detection receiving end AC network occur catastrophe failure, and 2 are entered step if catastrophe failure occurs,
In, catastrophe failure refer to occur in receiving end power grid make inversion current conversion station and alternating current net junction positive sequence voltage be less than 0.6 times it is specified
The failure of voltage；
Step 2, rectification current conversion station phase shift to inverter mode adjust rectification side thyristor valves Trigger Angle and are more than 90 degree of fortune
Row；
The straight-through operation of single-phase valve in step 3, inversion current conversion station voltage source converter triggering three-phase valve, while being latched another
Outer two-phase valve.
After inversion current conversion station detection failure has been removed, revocation triggers the straight-through operation of single-phase valve, inversion current conversion station and rectification
Current conversion station restores the method for operation before failure.
It describes in detail below to each step：
In step 1, inversion change of current station control system utilizes the three-phase alternating voltage U with AC network junctionA、UB、UCMeter
Calculate UposIf met：Upos≤Uref1, then judge that AC fault occurs for AC network, and send to rectification side control system
Ask phase shift signal；Wherein, UposFor the positive sequence voltage acquired by three-phase alternating voltage, Uref1For the threshold value of setting, by as follows
Formula is set：
Uref1=k*Idcpu*UN
Wherein, IdcpuFor DC current perunit value, U before failureNFor the rated voltage of Inverter Station and AC network junction, k
For proportionality coefficient, generally can value be 0.3~0.6, for example k values are 0.5.
Rectification change of current station control system receives the request phase shift signal of inverse control system, then it is brilliant to adjust rectification side immediately
Brake tube converter valve Trigger Angle is more than 90 degree of operations, general 120 degree~164 degree desirable, while being sent to inverter side control system
Phase shift run signal.
When rectification change of current station control system and inversion change of current station control system communication failure, rectification change of current station control system
The request phase shift signal of inversion current conversion station can not be received, alternatively, when the communication delay of two stations is excessive, rectification change of current station control system is received
To inversion current conversion station request phase shift signal when, the inversion change of current, which is stood erectly, to be flowed through voltage and has jeopardized equipment safety.To avoid this
Two kinds of situations in step 1, utilize the DC current I of rectification current conversion stationdcRAnd DC voltage UdcR, judge inversion current conversion station side
Whether AC network there is catastrophe failure, when meeting following formula, then judges that catastrophe failure occurs in inversion current conversion station side AC network：
Wherein, UdcRFor rectification current conversion station DC voltage, IdcRFor rectification current conversion station DC current,For DC current
Change rate,For DC voltage change rate, L is DC line inductance, and R is DC line resistance, UdcrefFor setting
Voltage threshold value, can between DC voltage rated value and the apparatus insulated over-voltage design value of DC side value, generally can be taken as
1.1~1.3 times of DC voltage rated value.
For the above detection criteria once meeting, rectification side control system also adjusts rectification side thyristor valves Trigger Angle immediately
More than 90 degree operations (such as 164 degree), while sending phase shift run signal to inverter side control system.
Inversion change of current station control system receives the phase shift run signal of rectification change of current station control system, or utilizes inverse
The direct current detection for becoming station goes out rectification current conversion station phase shift operation, triggers the straight-through operation of the single-phase valves of MMC immediately while locking is another
Two-phase valve.As shown in figure 3, the by-pass operation state of all submodule SM1~SMn of A phase upper and lower bridge arms is can trigger, in B phases and C phases
All submodules of lower bridge arm are latched operating status.
Wherein, it go out the phase shift of rectification current conversion station using the direct current detection of Inverter Station to run, be avoided in communication failure
Shi Wufa receives the phase shift run signal of rectification change of current station control system, and criterion is the change of DC current after a certain moment
RateIt is greater than the set value and (takes 10 times of rated direct currents per second), IdcIAbsolute value is decreased to 0 and IdcIReversely.
Work as Upos≥Uref2When, judge that inversion change of current station failure has been removed, wherein Uref2For the threshold value of setting, generally may be used
Take 0.7~0.95 times of AC network rated voltage.Inverter control system detectio has been removed to AC fault, revocation triggering A
The straight-through operation of phase valve, i.e. all submodules of A phases upper and lower bridge arm switch to be latched operating status from by-pass operation state, enter later extensive
Multiple logic.
Inverter Station solution locking-valve, and send the signal that resumes operation to rectification change of current station control system；Rectification change of current stand control system
System receives the signal that resumes operation of inversion change of current station control system, or detects that our station DC voltage restores, and adjusts thyristor
Trigger Angle is less than 90 degree of operations, into normal rectifier operations.So far Inverter Station and converting plant restore the operation before failure
Mode：Converting plant DC current control, inversion current conversion station is using constant DC voltage control and determines Reactive Power Control.The control at two stations
System adjustment Hybrid HVDC system processed restores the operating status before failure.
The present invention provides a kind of mixed type DC transmission system receiving end exchange side fault handling methods, wherein no matter whole
Whether stream station and Inverter Station communication are normal, and it is inverse that this method can ensure that mixed type DC transmission system reliably and securely passes through
Become the catastrophe failure of side AC network, limits the overvoltage and DC side overvoltage of voltage source converter internal capacitance, exchanging
After electric network fault is removed, mixed type DC transmission system can quickly, smoothly resume operation.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure made by bright specification and accompanying drawing content either equivalent process transformation or be directly or indirectly used in other correlation
Technical field, be included within the scope of the present invention.
Claims (6)
1. a kind of mixed type DC transmission system receiving end exchange side fault handling method, which is characterized in that include the following steps：
Whether step 1, detection receiving end AC network occur catastrophe failure, and 2 are entered step if catastrophe failure occurs；
Whether detection receiving end AC network, which occurs the method for catastrophe failure, is：
Inversion current conversion station utilizes the three-phase alternating voltage U with AC network junctionA、UB、UCCalculate positive sequence voltage UposIf
Meet：Upos≤Uref1, then judge that catastrophe failure occurs for receiving end AC network, and request phase shift signal is sent to rectification current conversion station；
Wherein, Uref1For the threshold value of setting, Uref1For the floating threshold directly proportional to DC current before failure, using following public affairs
Formula is set：
Uref1=k*Idcpu*UN
Wherein, IdcpuFor DC current perunit value, U before failureNFor the rated voltage of Inverter Station and AC network junction, k be than
Example coefficient, value are 0.3~0.6；
Alternatively, rectification current conversion station utilizes the DC current and voltage of our station, judge whether receiving end AC network occurs catastrophe failure,
When meeting following formula, then judge that catastrophe failure occurs for receiving end AC network：
Wherein, UdcRFor rectification current conversion station DC voltage, IdcRFor rectification current conversion station DC current,For the change of DC current
Rate,For DC voltage change rate, L is DC line inductance, and R is DC line resistance, UdcrefFor the voltage of setting
Threshold value；
Step 2, rectification current conversion station phase shift to inverter mode adjust rectification side thyristor valves Trigger Angle and are more than 90 degree of fortune
Row；
The straight-through operation of single-phase valve in step 3, inversion current conversion station voltage source converter triggering three-phase valve, while being latched other two
Phase valve.
2. a kind of mixed type DC transmission system receiving end exchange side fault handling method according to claim 1, feature
It is, after inversion current conversion station detection failure has been removed, revocation triggers the straight-through operation of single-phase valve, inversion current conversion station and the rectification change of current
The method of operation stood before restoring failure.
3. a kind of mixed type DC transmission system receiving end exchange side fault handling method according to claim 1, feature
It is, UdcrefIt is 1.1~1.3 times of DC voltage rated value.
4. a kind of mixed type DC transmission system receiving end exchange side fault handling method according to claim 1, feature
It is, after inversion current conversion station judges that catastrophe failure occurs for receiving end AC network, when the change rate of DC currentSpeedup
It stands erectly galvanic electricity stream I more than or equal to setting value, the inversion change of currentdcIAbsolute value is decreased to 0 and IdcIWhen reversed, then 3 are entered step.
5. a kind of mixed type DC transmission system receiving end exchange side fault handling method according to claim 1, feature
It is, works as Upos≥Uref2When, judge that inversion change of current station failure has been removed, wherein Uref2For the threshold value of setting, UposIt is basis
The three-phase alternating voltage U of inversion current conversion station and AC network junctionA、UB、UCCalculated positive sequence voltage；When inversion current conversion station
Detection failure enters after having removed restores logic.
6. a kind of mixed type DC transmission system receiving end exchange side fault handling method according to claim 5, feature
It is, Uref2It is 0.7~0.95 times of AC network rated voltage.
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