CN109742784A - A kind of bulk power grid large capacity fast electric air braking system control method - Google Patents
A kind of bulk power grid large capacity fast electric air braking system control method Download PDFInfo
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- CN109742784A CN109742784A CN201811547455.XA CN201811547455A CN109742784A CN 109742784 A CN109742784 A CN 109742784A CN 201811547455 A CN201811547455 A CN 201811547455A CN 109742784 A CN109742784 A CN 109742784A
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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 present invention discloses a kind of bulk power grid large capacity fast electric air braking system control method, it is mainly used for extensive power supply and sends out occasion, if high power DC occurs in extra-high voltage alternating current-direct current power grid occurs commutation failure or the failures such as direct current locking or the interruption of important communication channel, generator rotor angle is caused substantially to vibrate, cause voltage to frequency problem, resistance or reactance are then put into rapidly by thyristor switch, carry out active or idle braking, the control method includes following step: (1) identifying system failure, including DC Line Fault is mainly to exchange service channel failure；(2) combining braking system temperature, perhaps residual flow state, installation point real-time voltage information are quickly thrown using thyristor and move back resistance or inductance；(3) combination failure information delay exits braking system.The method moves back high-power active or load or burden without work by quickly throwing, and reduces system transient modelling overvoltage, inhibits the fluctuation of system generator rotor angle, increases system voltage, power-angle stability.
Description
Technical field
The invention belongs to field of power system, in particular to a kind of bulk power grid large capacity fast electric air braking system controlling party
Method.
Background technique
There is generation of electricity by new energy (wind-power electricity generation, photovoltaic power generation) concentrated area and power load central areas in China apart
Farther out the problem of, a kind of mode of solution are to realize point-to-point high-power conveying, this electricity by more times D.C. high voltage transmissions
The variation of source structure and the formation of AC-DC hybrid power grid pattern make the written main lance for influencing power grid security of stability problem
Shield is mainly reflected in: when short trouble occurs for power grid, since commutation failure can occur for single time or more times D.C. high voltage transmissions
Even locking or important communication channel failure and other reasons, the appearance of direct current transmission active power is substantially fallen in short-term, to alternating current
Net causes active impact, and AC network generator rotor angle occurs substantial power fluctuation, causes system voltage fluctuation occur, may lead
The a large amount of off-grids of new energy are sent out, further deteriorates system generator rotor angle, Voltage-stabilizing Problems, eventually leads to power grid unstability.Additionally, due to sending
End is sent out power and is greatly reduced, and sending end mains frequency may be reduced quickly, may further cause low-frequency load shedding movement.
For grid stability problem caused by bulk power grid power rush, traditional method is that cooperation is cut machine and arranged in electric system
It applies, but there are drawbacks for this method, system is weakened the control ability of voltage after a large amount of unit excision, the stabilization of power grid
Property problem may be protruded more；In addition, sending end power grid will appear low-and high-frequency Alternate Phenomenon after direct current locking restores.
Summary of the invention
The purpose of the present invention is to propose a kind of bulk power grid large capacity fast electric air braking system control method, main to use
Occasion is sent out in extensive power supply, commutation failure occurs for high power DC or direct current closes if occurred in extra-high voltage alternating current-direct current power grid
The failures such as lock or the interruption of important communication channel, inhibit system generator rotor angle and voltage fluctuation, increase system stability.
In order to achieve the above objectives, solution of the invention is:
A kind of bulk power grid large capacity fast electric air braking system control method is mainly used for extensive power supply and sends out occasion,
If high power DC occurs in extra-high voltage alternating current-direct current power grid to occur in commutation failure or direct current locking or important communication channel
The failures such as disconnected, cause generator rotor angle substantially to vibrate, cause voltage to frequency problem, then put into resistance or electricity rapidly by thyristor switch
It is anti-, carry out active or idle braking, the control method include following step: (1) identifying system failure, including DC Line Fault with
Main exchange service channel failure；(2) braking system temperature or residual flow state, installation point real-time voltage information are combined, is used
Thyristor is quickly thrown and moves back resistance or inductance；(3) combination failure information delay exits braking system.Specifically:
(1) converter station exchange side power information and fault message are obtained, direct current is calculated or important communication channel is active
Power variation Δ P (absolute value of decrement), judges following two condition while meeting, then sequentially carries out step (3) to (4):
A) when Δ P is greater than power and variable threshold value Δ Pset；B) respective action signal is received；
(2) converter station exchange side power information and fault message are obtained, is calculated converter station Δ Q (absolute value of increment),
Judge following two condition while meeting, then sequentially carry out step (5): a) when Δ Q is greater than power and variable threshold value Δ Qset；B) it connects
It receives steady control or action signal is protected in direct current control；
(3) time interval Δ T1, detection resistance temperature t1, as Δ T1 of the detection from one action moment of last time to current time
Greater than delay definite value T1set and resistance temperature t1 is less than temperature and sets definite value t1set, triggers valve group, puts into braking resistor, carries out
Active braking；
(4) start timing after active braking investment, if making time Tin1 is greater than Tinset1, exit active braking；
(5) idle braking system residual flow Ir is detected, if Ir is less than residual flow and sets definite value Irset, triggers valve group, investment braking
Reactance carries out idle braking；
(6) real-time monitoring installation point voltage exits idle braking if installation point voltage U is less than Uset.
In above scheme, if occurred in extra-high voltage alternating current-direct current power grid, commutation failure occurs for high power DC or direct current closes
The failures such as lock or the interruption of important exchange service channel, cause generator rotor angle substantially to vibrate, cause voltage to frequency problem, then pass through valve
Perhaps reactance carries out active or idle fast braking to investment resistance to group rapidly；
In above scheme, the active braking system chief component includes valve group, resistance, using grouping or is concentrated
Formula design；The active braking system chief component includes valve group, and reactance is designed using block form；
In above scheme, in the step (1), direct current refers to extra-high voltage, high power DC；Important communication channel refers to water
Electricity sends out other communication channels for exchanging service channel between channel, province and constraining power supply submitting ability；
In above scheme, in the step (1), receives respective action signal and refer to from protection, steady control or direct current control
Guarantor receives action signal；
In above scheme, in the step (1), (2), P, Q are calculated using the voltage and current directly acquired, and calculation method is adopted
With dq change instantaneous power calculation method, Δ P, Δ Q calculation method be current instantaneous power subtract device start before power；
In above scheme, in the step (3), time delay condition and temperature condition be with relationship, if temperature acquisition data
Wrong or collector failure is checked, then temperature condition meets always；
In above scheme, in the step (6), after idle braking investment, the unique conditional exited is installation point voltage, is moved back
It is exited one by one when out according to grouping；
When there is DC Line Fault or important communication channel failure with system where the large capacity electric braking, cause
Active reactive significantlys change, and electric braking control system is closed valve group, and resistance or reactance are connected with the system, leads to
It crosses resistance or reactance and quickly inhibits system generator rotor angle or voltage change；
When above-mentioned steps (4), (6) condition meet, valve group is disconnected, load impedance is separated with system.
After adopting the above scheme, D.C. high voltage transmission can be consumed since commutation failure or locking or important exchange are logical
The transient state energy that road failure generates inhibits power grid generator rotor angle and transient overvoltage problem occur.
The present invention compared to the prior art, have following technological merit and the utility model has the advantages that
1) present invention uses thyristor switch scheme, in extra-high voltage alternating current-direct current system commutation failure or locking, Huo Zhechong
When wanting communication channel failure, quick control is independently decoupled for active and reactive problem respectively；
2) current solution is mainly completed by cutting machine, and the program can reduce the machine of cutting or even not cut machine, increases system
Stability.
Detailed description of the invention
Fig. 1 is large capacity electric braking system schematic；
Wherein: 1. mechanical switch；2. valve group；3. resistance；4. reactance；5. installing bus；
Fig. 2 is to throw active brake logic schematic diagram；
Fig. 3 is to move back active brake logic schematic diagram；
Fig. 4 is to throw idle brake logic schematic diagram；
Fig. 5 is to move back idle brake logic schematic diagram；
Fig. 6 is flow chart of the invention.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail.
The present invention provides a kind of bulk power grid large capacity fast electric air braking system control method, is mainly used for extensive power supply
Send out occasion, if in extra-high voltage alternating current-direct current power grid occur high power DC occur commutation failure or direct current locking or it is important
The failures such as communication channel interruption, cause generator rotor angle substantially to vibrate, cause voltage to frequency problem, then are put into rapidly by thyristor switch
Perhaps reactance carries out active or idle braking to resistance.Fig. 1 is large capacity fast electric air braking system structure chart, wherein valve group
2 one end connects installation bus 5 through mechanical switch 1, and the other end of valve group 2 is grounded through resistance 3 or reactance 4, and valve group 2 is by thyristor
Switch is constituted；Fig. 2 is active braking investment logical schematic；Fig. 3 is that logical schematic is exited in active braking；Fig. 4 is idle system
It is dynamic to exit logical schematic；Fig. 5 is that logical schematic is exited in idle braking.Cooperate shown in Fig. 6, which includes following steps
It is rapid:
(1) converter station exchange side power information and fault message are obtained, direct current is calculated or important communication channel is active
Power variation Δ P (absolute value of decrement), judges following two condition while meeting, then sequentially carries out step (3) to (4):
A) when Δ P is greater than power and variable threshold value Δ Pset；B) respective action signal is received；
(2) converter station exchange side power information and fault message are obtained, is calculated converter station Δ Q (absolute value of increment),
Judge following two condition while meeting, then sequentially carry out step (5): a) when Δ Q is greater than power and variable threshold value Δ Qset；B) it connects
It receives steady control or action signal is protected in direct current control；
(3) time interval Δ T1, detection resistance temperature t1, as Δ T1 of the detection from one action moment of last time to current time
Greater than delay definite value T1set and resistance temperature t1 is less than temperature and sets definite value t1set, triggers electronic power switch, investment braking
Resistance carries out active braking；It can refer to shown in Fig. 2；
(4) start timing after active braking investment, if making time Tin1 is greater than Tinset1, exit active braking, it can
Cooperate shown in Fig. 3.
(5) idle braking system residual flow Ir is detected, if Ir is less than residual flow and sets definite value Irset, thyristor switch is triggered, throws
Enter to brake reactance, carries out idle braking；It can cooperate shown in Fig. 4；
(6) real-time monitoring installation point voltage exits idle braking, can cooperate Fig. 5 if installation point voltage U is less than Uset
It is shown.
Wherein, if in extra-high voltage alternating current-direct current power grid occur high power DC occur commutation failure or direct current locking or
The failures such as important exchange service channel interruption, cause generator rotor angle substantially to vibrate, cause voltage to frequency problem, then pass through thyristor switch
Perhaps reactance carries out active or idle fast braking to investment resistance rapidly；
Wherein, the active braking system chief component includes thyristor switch, resistance, using grouping or is concentrated
Formula design；The active braking system chief component includes thyristor switch, and reactance is designed using block form；
Wherein, in the step (1), direct current refers to extra-high voltage, high power DC；Important communication channel refers to that water power is sent out
Service channel is exchanged between channel, province and constrains other communication channels that power supply sends out ability；
Wherein, it in the step (1), receives respective action signal and refers to and received from protection, steady control or direct current control guarantor
Action signal；
Wherein, the step (1), in (2), P, Q are calculated using the voltage and current directly acquired, and calculation method is using dq change
Change instantaneous power calculation method, Δ P, Δ Q calculation method be current instantaneous power subtract device start before power；
Wherein, in the step (3), time delay condition and temperature condition be with relationship, if temperature acquisition data check has
Mistake or collector failure, then temperature condition meets always；
Wherein, in the step (6), after idle braking investment, the unique conditional exited is installation point voltage, when exiting by
It is exited one by one according to grouping；
When there is DC Line Fault or important communication channel failure with system where the large capacity electric braking, cause
Active reactive significantlys change, and electric braking control system is closed thyristor switch, by resistance or reactance and the system
It is connected, system generator rotor angle or voltage change is quickly inhibited by resistance or reactance；
When above-mentioned steps (4), (6) condition meet, thyristor switch is disconnected, load impedance is separated with system.
After adopting the above scheme, D.C. high voltage transmission can be consumed since commutation failure or locking or important exchange are logical
The transient state energy that road failure generates inhibits power grid generator rotor angle and transient overvoltage problem occur.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (8)
1. a kind of bulk power grid large capacity fast electric air braking system control method, it is characterised in that:
Comprising realizing real power control and idle control, realize that real power control includes the following steps:
Step a1 obtains converter station exchange side power information and fault message, calculates direct current or important communication channel is active
Power variation Δ P, and a2 is gone to step when judging following two condition while meeting: condition 1, Δ P are greater than power and variable threshold
It is worth Δ Pset；Condition 2 receives respective action signal；
Step a2 detects time interval Δ T1, detection resistance temperature t1, as Δ T1 from one action moment of last time to current time
Greater than delay definite value T1set and resistance temperature t1 is less than temperature and sets definite value t1set, puts into braking resistor, carries out active braking；
Step a3, active braking start timing after putting into, if making time Tin1 is greater than Tinset1, exit active braking；
Realize that idle control includes the following steps:
Step b1 obtains converter station exchange side power information and fault message, calculates converter station reactive power variation delta Q,
And go to step b2 when judging following two condition while meeting: condition 1, Δ Q are greater than power and variable threshold value Δ Qset；Condition 2,
It receives steady control or action signal is protected in direct current control；
Step b2 detects idle braking system residual flow Ir, if Ir is less than residual flow and sets definite value Irset, investment braking reactance is carried out
Idle braking；
Step b3, real-time monitoring installation point voltage exit idle braking if installation point voltage U is less than Uset.
2. a kind of bulk power grid large capacity fast electric air braking system control method as described in claim 1, it is characterised in that: institute
It states in step a2, the system for carrying out active braking includes mechanical switch, valve group and braking resistor, wherein one end of valve group is through machine
Tool switch connection installation bus, the other end of valve group are grounded through braking resistor；When need to put into braking resistor, valve group closure.
3. a kind of bulk power grid large capacity fast electric air braking system control method as described in claim 1, it is characterised in that: institute
It states in step b2, the system for carrying out idle braking includes mechanical switch, valve group and braking reactance, wherein one end of valve group is through machine
Tool switch connection installation bus, the other end of valve group is through braking reactance grounded；When need to put into braking reactance, valve group closure.
4. a kind of bulk power grid large capacity fast electric air braking system control method as described in claim 1, it is characterised in that: institute
It states in step a1, direct current refers to extra-high voltage, high power DC, and important communication channel refers to that water power is sent out and exchanges connection between channel, province
Network channel and constraint power supply send out the communication channel of ability.
5. a kind of bulk power grid large capacity fast electric air braking system control method as described in claim 1, it is characterised in that: institute
It states in step a1, receives respective action signal and refer to from protection, steady control or direct current control guarantor and receive action signal.
6. a kind of bulk power grid large capacity fast electric air braking system control method as described in claim 1, it is characterised in that: institute
State in step a1, b1, Δ P, Δ Q calculation method be current instantaneous power subtract device start before power.
7. a kind of bulk power grid large capacity fast electric air braking system control method as described in claim 1, it is characterised in that: institute
It states in step a2, if temperature acquisition data checks wrong or collector failure, then it is assumed that resistance temperature t1 is set less than temperature
Definite value t1set.
8. a kind of bulk power grid large capacity fast electric air braking system control method as described in claim 1, it is characterised in that: institute
It states in step b3, after idle braking investment, the unique conditional exited is installation point voltage, is exited one by one when exiting according to grouping.
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