CN105932705B - A kind of emergency control method for coping with the continuous commutation failure of high voltage direct current - Google Patents
A kind of emergency control method for coping with the continuous commutation failure of high voltage direct current Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
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Abstract
The invention discloses a kind of emergency control methods for coping with the continuous commutation failure of high voltage direct current, belong to power system and automation technology.The continuous commutation failure failure of DC transmission system may cause sending end power grid transient state generator rotor angle unstability, the main reason for continuous commutation failure causes system unstability is that direct current transmission power continuity rapid drawdown causes generator accumulation that area is accelerated to be greater than retardation area, and the accumulation amount in safety and stability control device using the commutation failure time is as INSTABILITY CRITERION and the matching foundation for cutting machine scheme.It is latched in critical commutation failure time interval in the critical integral commutation failure time to direct current, only with the safety and stability for cutting machine measure guarantee system, cuts machine after needing to be latched related direct current if the accumulation commutation failure time is greater than the direct current locking critical commutation failure time.The present invention simplifies the process for judging unstability Yu matching strategy table for the complexity of continuous commutation failure failure, can satisfy the requirement of Practical Project.
Description
Technical field
The present invention is in power system and automation technology, and more precisely the invention proposes a kind of reply high pressures
The continuous commutation failure of direct current causes the emergency control method of sending end grid generator generator rotor angle unstability.
Background technique
The big density of direct current system accesses AC network, so that it is increasingly complicated to influence each other between AC and DC system, to power grid
Safe and stable operation brings huge challenge.The commutation failure failure of high power DC system is relatively common, is mostly exchanged by receiving end
The system failure causes.Dc power declines to a great extent during commutation failure, and the synchronous generator of direct current sending end power grid accelerates, such as commutation
The failure duration is short, dc power can fast quick-recovery, the stable operation of system is influenced less, but continuous commutation failure is to being
Than more serious, the repeated stock of continuous commutation failure may cause sending end unit with respect to generator rotor angle unstability and again for the influence for stability of uniting
Exchange contact section off-the-line.In addition to being connected to the high-voltage direct current of weak AC system since a large amount of idle consumption cause to occur
Outside continuous commutation failure, sky fills main transformer, excitation surge current, single-phase fault reclosing etc. and is possible to because of reasons such as wave distortions
And then cause the continuous commutation failure of direct current system.
For safety and stability control device when power grid emergency is occurred by large disturbances, it is tight that machine, cutting load etc. are cut in execution
Anxious control measure make system keep safe and stable operation.Currently, can lead to for sending end AC network DC system locking failure
It crosses safety and stability control device and promptly cuts the safety and stability that machine guarantees system, and there has been no having for the continuous commutation failure of direct current
Imitate control means.Commutation failure protection in direct current control and protection system at least wants commutation failure caused by fault in ac transmission system
Direct current can be just latched by continuing 2.6s, and system very likely loss of stability, thus gives extra-high voltage alternating current-direct current interconnection electricity at this time
The safe and stable operation of net brings great security risk.
Safety and stability control device is generally basede on simple and reliable control scheme list using " offline decision, real-time matching "
Control mode.The factors such as the mode of connection of control strategy and power grid, trend situation and fault type have more complicated relationship,
The formulation of strategy is based on a large amount of off-line simulation calculated results, considers according to most serious situation.Continuous commutation failure occurs for direct current
Situation is relative complex, and commutation failure number, single commutation failure duration, time interval between each secondary commutation failure etc. are all
It is possible that it is different, and various factors can have an impact the security and stability of system.If various factors is all included in plan
Sketch form is generated strategy and is matched according to combined situation each other, then tactful table structure is excessively complicated, be not only difficult to from
Line is formulated, and the risk of online mismatch is also increased.Due to the complexity of continuous commutation failure situation, in order to simplify judge unstability with
The process of matching strategy table needs to extract foundation of the main feature amount as INSTABILITY CRITERION and match decision.
Summary of the invention
Object of the present invention is to：It may cause sending end power grid unit generator rotor angle unstability for the continuous commutation failure of high voltage direct current to ask
Topic provides a kind of emergency control method that machine and locking direct current are cut using safety and stability control device.
Basic principle of the invention is：The continuous commutation failure failure of DC transmission system may cause sending end power grid transient state
The main reason for generator rotor angle unstability, continuous commutation failure causes system unstability is that the successional rapid drawdown of direct current transmission power makes generator
Accelerate, show as accumulation and accelerate area excessive, and accumulates and the cumulative duration of area and commutation failure is accelerated to be positively correlated.Therefore
Consider to simplify the recovery time in short-term handled between each secondary commutation failure, the accumulation amount using the commutation failure time is sentenced as unstability
According to the matching foundation of cutting machine scheme, i.e., the identical accumulation commutation failure time corresponds to identical Failure Model and cuts machine scheme,
Although so bringing certain error, in the range of engineering allows.It is latched in the critical integral commutation failure time to direct current
In critical commutation failure time interval, only with the safety and stability for cutting machine measure guarantee system；It is big such as to accumulate the commutation failure time
Machine is cut after then needing to be latched related direct current in the direct current locking critical commutation failure time.This method is directed to continuous commutation failure failure
Complexity simplify and judge the process of unstability Yu matching strategy table, can satisfy the requirement of Practical Project.
Specifically, the present invention adopts the following technical solutions realize, include the following steps：
1) judge whether DC transmission system occurs commutation failure failure, such as occur, then direct current control and protection system will be relevant
Commutation failure signal sends safety and stability control device, and the commutation failure time totalizer in safety and stability control device starts to count
When and accumulate the commutation failure time；
2) if the accumulation commutation failure time in safety and stability control device is less than or equal to current direct current transmission power and is
The corresponding direct current of the method for operation of uniting is latched critical commutation failure time value, and greater than predetermined after the last commutation failure
Commutation failure does not occur in the time interval of threshold value again, then judges that DC transmission system commutation failure is recovered, exports
It the accumulation commutation failure time of meter and the last commutation failure, enters step 3), otherwise, return step 1)；If safety and stability
The accumulation commutation failure time in control device is greater than current direct current transmission power and the corresponding direct current locking of system operation mode
4) critical commutation failure time value, then enter step；
3) current direct current transmission power and system operation side are matched in control scheme list according to the accumulation commutation failure time
The corresponding control strategy of formula, it is determined whether needs, which are taken, cuts machine measure accordingly, as needed to take, passes through security and stability control
Machine control command is cut in device execution, is later reset commutation failure time totalizer, return step 1), otherwise, directly by commutation
Time To Failure accumulator is reset, return step 1)；
4) according to current direct current transmission power and the corresponding control strategy of system operation mode, by safety and stability control device
It issues locking direct current signal to direct current control and protection system and executes and cut machine control command accordingly, the commutation failure time adds up later
Device is reset, return step 1).
Above-mentioned technical proposal is further characterized by, current direct current transmission power and system operation side described in step 2)
The corresponding direct current of formula is latched critical commutation failure time value, is matched according to current direct current transmission power and system operation mode offline
The control scheme list of calculating obtains, and specific steps include：
1) stepping is carried out according to intervals of power for different direct current transmission powers, for the dc power of each gear, choosing
Select multiple canonical system methods of operation that security margin is less than corresponding setting threshold value；
2) consider by serious conditions, dc power is set as 0 when commutation failure, take the typical commutation failure duration and
Commutation failure time interval twice obtains corresponding to different operations based on time-domain-simulation by adjusting the number of continuous commutation failure
The continuous commutation failure number of each gear AC power system neutrality under mode, and then obtain under corresponding different running method
Critical integral commutation failure time delay is latched by the critical integral commutation failure time of each gear dc power as direct current
The critical commutation failure time.
Above-mentioned technical proposal is further characterized by, according to the accumulation commutation failure time in control plan in the step 3)
Current direct current transmission power and the corresponding control strategy of system operation mode, including following procedure are matched in sketch form：
1) critical in acquisition different running method each gear dc power critical integral commutation failure time and direct current locking
On the basis of the commutation failure time, the time zone of critical commutation failure time is latched in the critical integral commutation failure time to direct current
In, continuous commutation failure number is increased by simulation and seeks cutting machine under the different accumulation commutation failure times based on time-domain-simulation
Number of units and cut machine amount；
2) by system operation mode, direct current transmission power, direct current accumulation commutation failure time interval and including cutting board number
With cut the control measure organizational politics table including machine amount, when continuous commutation failure occurs for certain direct current in actual motion, preparatory
Corresponding control strategy is matched in the Policy Table of formulation.
Above-mentioned technical proposal is further characterized by, current direct current transmission power and system operation side in the step 4)
The corresponding control strategy of formula, is formulated by following procedure：
1) face greater than direct current locking based on the accumulation commutation failure time under each gear dc power under different running method
The case where boundary's commutation failure time, seeks cutting after direct current locking failure based on time-domain-simulation and board number and cuts machine amount；
2) by system operation mode, direct current transmission power, direct current it is latched critical commutation failure time and including cutting board number
With cut the control measure organizational politics table including machine amount, when continuous commutation failure and accumulation commutation occur for certain direct current in actual motion
When Time To Failure is greater than the direct current locking critical commutation failure time, corresponding control plan is matched in the Policy Table pre-established
Slightly.
Beneficial effects of the present invention are as follows：The present invention may cause for the continuous commutation failure failure of DC transmission system and send
Power grid transient state generator rotor angle destabilization problems are held, are sentenced using the accumulation amount of commutation failure time as unstability in safety and stability control device
According to the matching foundation of cutting machine scheme, can simplify the process for judging unstability Yu matching strategy table, resolution policy table structure is excessively
Difficulty of the complicated difficult to formulate offline effectively improves the urgent control of the reply continuous commutation failure of extra-high voltage high-power direct current system
Ability processed, reducing the continuous commutation failure of high power DC system leads to the risk of power grid unstability.To sum up, the present invention proposes
A kind of reply high voltage direct current continuous commutation failure cuts machine and locking direct-current emergency control method, can meet wanting for Practical Project
It asks.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention.
Fig. 2 is the INSTABILITY CRITERION schematic diagram for accumulating the commutation failure time.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings and in conjunction with example.
Embodiment 1：
One embodiment of the present of invention, process are as described in Figure.Specifically, step 1 describes in Fig. 1, judgement is straight
Whether stream transmission system occurs commutation failure failure, such as occurs, then direct current control and protection system sends relevant commutation failure signal
Safety and stability control device, the commutation failure time totalizer in safety and stability control device start timing and accumulate commutation failure
Time.
The main reason for continuous commutation failure causes system unstability is that the successional rapid drawdown of direct current transmission power to accumulate
Accelerate area to be greater than retardation area, and accumulate and the cumulative duration of area and commutation failure is accelerated to be positively correlated (referring to fig. 2),
Using the commutation failure time accumulation amount (referred to as accumulation commutation failure time) as INSTABILITY CRITERION with cut the matching of machine scheme according to
According to that is, identical accumulation commutation failure time corresponds to identical Failure Model and cuts machine scheme.
By taking commutation failure twice in succession as an example, accumulation commutation failure time t is calculated using formula (1).
In formula, tδ1、tδ2Respectively for the first time, second of commutation failure start time,Respectively for the first time, the
Secondary dc power is restored the moment, and Δ t is that commutation failure terminates the time interval restored to dc power.
In Fig. 2, left figure is the equivalent generator's power and angle response curve schematic diagram that commutation failure twice in succession occurs.Wherein,
Upper and lower two curves are that system equivalent generator power characteristic curve before and after commutation failure, P occursmFor equivalent generator mechanical function
Rate,WithEquivalent generator electromagnetic power respectively before and after commutation failure.Systematic steady state operating point is a, corresponding generator rotor angle
For δ1, after commutation failure occurs for direct current system, system operating point changes to b by a.Equivalent power generation after commutation failure in c point
Machine power restores to d point, and corresponding generator rotor angle is δC1.Generator slows down since operating point d, and running to e point, (corresponding to generator rotor angle is
δ2) second of commutation failure occurs, system operating point changes to f by e, equivalent generator power after commutation failure in g point
Restore to h point, corresponding generator rotor angle is δC2。Sinc1, Sinc2Corresponding equivalent power generation for the first time, during second of continuous commutation failure
Machine accelerates area, Sdec1, Sdec2Be it is corresponding for the first time, the equivalent generator retardation area of second continuous commutation failure.
In Fig. 2, right figure is that the equivalent generator accumulation of generation commutation failure twice in succession accelerates area and commutation failure tired
The product duration is positively correlated schematic diagram.On the basis of left figure, the acceleration area during second of commutation failure is moved to
After accelerating area during commutation failure, while the retardation area after first time commutation failure is moved to and changes for the second time
Mutually after failure before retardation area.As seen from the figure, the accumulation of commutation failure twice accelerates area to hold with commutation failure accumulation
Continuous time corresponding acceleration area approximation is equal, wherein when commutation failure cumulative duration is that first time commutation failure continues
Between (from δ1To δC1The corresponding time) and second of commutation failure duration (from δ2To δC2The sum of the corresponding time).By right figure
As it can be seen that commutation failure accumulation accelerates area and commutation failure cumulative duration positive correlation twice in succession.
Step 2 describes in Fig. 1, and safety and stability control device monitors direct-current commutation failure signal, if safety and stability control
The accumulation commutation failure time in device processed is less than or equal to current direct current transmission power and the corresponding direct current of system operation mode closes
Critical commutation failure time value is locked, and (is traditionally arranged to be after the last commutation failure greater than scheduled threshold value
Commutation failure does not occur in time interval 0.2s) again, then judges that DC transmission system commutation failure is recovered, output meter
And the accumulation commutation failure time of the last commutation failure, 3 are entered step, otherwise, return step 1；If security and stability control
The accumulation commutation failure time in device is greater than current direct current transmission power and the corresponding direct current locking of system operation mode is critical
Commutation failure time value, then enter step 4；
The direct current be latched the critical commutation failure time according to current direct current transmission power and system operation mode match from
The control scheme list of line computation obtains.Specifically include following detailed step：
(1) stepping, needle are carried out according to certain intervals of power (representative value takes 300MW) for different direct current transmission powers
To the dc power of each gear, security margin is selected to be less than the multiple canonical systems for setting threshold value (representative value 5%)
The method of operation；
(2) consider by serious conditions, dc power is set as 0 when commutation failure, takes the typical commutation failure duration
Commutation failure time interval twice obtains corresponding to different fortune based on time-domain-simulation by adjusting the number of continuous commutation failure
The continuous commutation failure number of the system neutrality of each gear dc power under line mode, and then obtain corresponding to different operation sides
The critical integral commutation failure time of each gear dc power under formula, for a period of time by critical integral commutation failure time delay
(being usually arranged as 0.3s) is latched the critical commutation failure time as direct current.
Step 3 describes in Fig. 1, matches current direct current in control scheme list according to the accumulation commutation failure time and conveys
Power and the corresponding control strategy of system operation mode, it is determined whether needs, which are taken, cuts machine measure accordingly, if needing to take
Machine control command is cut by safety and stability control device execution, is later reset commutation failure time totalizer, return step 1,
Otherwise, directly commutation failure time totalizer is reset, return step 1；
The machine control scheme list of cutting based on the accumulation commutation failure time is formulated, and is comprised the following specific steps that：
(1) different running method each gear dc power critical integral commutation failure time is obtained in step 2 and direct current closes
On the basis of locking the critical commutation failure time, the critical commutation failure time is latched in the critical integral commutation failure time to direct current
In time interval, continuous commutation failure number is increased by simulation and is sought under the different accumulation commutation failure times based on time-domain-simulation
Cut and board number and cut machine amount.
(2) by system operation mode, direct current transmission power, direct current accumulation commutation failure time interval and control measure (packet
Include cut board number and cut machine amount) organizational politics' table, when in actual motion certain direct current occur continuous commutation failure when, pre-establishing
Policy Table in match corresponding control strategy.
The control strategy sheet form of the continuous commutation failure of direct current is shown in such as the following table 1.
The continuous commutation failure of 1 direct current of table cuts machine control scheme list
Step 4 describes in Fig. 1, according to current direct current transmission power and the corresponding control strategy of system operation mode,
It issues locking direct current signal from safety and stability control device to direct current control and protection system and executes and cut machine control command accordingly, later
Commutation failure time totalizer is reset, return step 1.
The machine control scheme list of cutting for being latched the critical commutation failure time based on direct current is formulated, including following specific step
Suddenly：
(1) face greater than direct current locking based on the accumulation commutation failure time under each gear dc power under different running method
The case where boundary's commutation failure time, seeks cutting after direct current locking failure based on time-domain-simulation and board number and cuts machine amount.
(2) critical commutation failure time and control measure (packet are latched by system operation mode, direct current transmission power, direct current
Include and cut board number and cut machine amount) organizational politics' table, when continuous commutation failure occurs for certain direct current in actual motion and accumulation commutation is lost
When losing the time greater than the direct current locking critical commutation failure time, corresponding control strategy is matched in the Policy Table pre-established.
Tactful sheet form is shown in Table 1.
Although the present invention has been described by way of example and in terms of the preferred embodiments, embodiment is not for the purpose of limiting the invention.Not
It is detached from the spirit and scope of the present invention, any equivalent change or retouch done also belongs to the protection scope of the present invention.Cause
This protection scope of the present invention should be based on the content defined in the claims of this application.
Claims (4)
1. a kind of emergency control method for coping with the continuous commutation failure of high voltage direct current, which is characterized in that include the following steps：
1) judge whether DC transmission system occurs commutation failure failure, such as occur, then direct current control and protection system is by relevant commutation
Failure signal sends safety and stability control device, and the commutation failure time totalizer in safety and stability control device starts timing simultaneously
Accumulate the commutation failure time；
2) if the accumulation commutation failure time in safety and stability control device is less than or equal to current direct current transmission power and system is transported
The corresponding direct current of line mode is latched critical commutation failure time value, and is being greater than pre- set threshold after the last commutation failure
Commutation failure does not occur in the time interval of value again, then judges that DC transmission system commutation failure is recovered, output meter and
It the accumulation commutation failure time of the last commutation failure, enters step 3), otherwise, return step 1)；If security and stability control
The accumulation commutation failure time in device is greater than current direct current transmission power and the corresponding direct current locking of system operation mode is critical
4) commutation failure time value then enters step；
3) current direct current transmission power and system operation mode pair are matched in control scheme list according to the accumulation commutation failure time
The control strategy answered, it is determined whether needs, which are taken, cuts machine measure accordingly, as needed to take, passes through safety and stability control device
Machine control command is cut in execution, is later reset commutation failure time totalizer, return step 1), otherwise, directly by commutation failure
Time totalizer is reset, return step 1)；
4) according to current direct current transmission power and the corresponding control strategy of system operation mode, from safety and stability control device to straight
Flow control insurance system, which issues locking direct current signal and executes, cuts machine control command accordingly, later that commutation failure time totalizer is clear
Zero, return step 1).
2. the emergency control method of the reply continuous commutation failure of high voltage direct current according to claim 1, which is characterized in that step
It is rapid 2) described in current direct current transmission power and the corresponding direct current of system operation mode be latched critical commutation failure time value, according to
The control scheme list of current direct current transmission power and system operation mode matching off-line calculation obtains, and specific steps include：
Stepping 2-1) is carried out according to intervals of power for different direct current transmission powers, for the dc power of each gear, selection
Security margin is less than multiple canonical system methods of operation of corresponding setting threshold value；
2-2) consider by serious conditions, dc power is set as 0 when commutation failure, takes typical commutation failure duration and two
Secondary commutation failure time interval obtains corresponding to different operation sides based on time-domain-simulation by adjusting the number of continuous commutation failure
The continuous commutation failure number of each gear AC power system neutrality under formula, and then obtain each under corresponding different running method
The critical integral commutation failure time of gear dc power faces critical integral commutation failure time delay as direct current locking
Boundary's commutation failure time.
3. the emergency control method of the reply continuous commutation failure of high voltage direct current according to claim 2, which is characterized in that institute
It states in step 3) and current direct current transmission power and system operation side is matched in control scheme list according to the accumulation commutation failure time
The corresponding control strategy of formula, including following procedure：
3-1) critical change is latched in acquisition different running method each gear dc power critical integral commutation failure time and direct current
On the basis of phase Time To Failure, the time interval of critical commutation failure time is latched in the critical integral commutation failure time to direct current
It is interior, continuous commutation failure number is increased by simulation and seeks cutting board under the different accumulation commutation failure times based on time-domain-simulation
Count and cut machine amount；
3-2) by system operation mode, direct current transmission power, direct current accumulation commutation failure time interval and including cut board number and
The control measure organizational politics table including machine amount is cut, when continuous commutation failure occurs for certain direct current in actual motion, is made in advance
Corresponding control strategy is matched in fixed Policy Table.
4. the emergency control method of the reply continuous commutation failure of high voltage direct current according to claim 3, which is characterized in that institute
Current direct current transmission power and the corresponding control strategy of system operation mode in step 4) are stated, is formulated by following procedure：
It is 4-1) critical to direct current locking is greater than based on the accumulation commutation failure time under each gear dc power under different running method
The case where commutation failure time, seeks cutting after direct current locking failure based on time-domain-simulation and board number and cuts machine amount；
4-2) by system operation mode, direct current transmission power, direct current be latched critical commutation failure time and including cut board number and
The control measure organizational politics table including machine amount is cut, when continuous commutation failure occurs for certain direct current in actual motion and accumulation commutation is lost
When losing the time greater than the direct current locking critical commutation failure time, corresponding control strategy is matched in the Policy Table pre-established.
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| CN107546749A (en) * | 2017-09-04 | 2018-01-05 | 中国电力科学研究院 | A kind of peace control after direct current locking failure cuts machine measure amount and calculates method and system |
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| CN109659964B (en) * | 2017-10-12 | 2023-09-22 | 中国电力科学研究院 | Method and device for preventing direct current locking |
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| CN109888814B (en) * | 2019-03-21 | 2020-06-30 | 重庆大学 | Continuous commutation failure direct current blocking suppression method based on sound direct current emergency support |
| CN110581564B (en) * | 2019-08-12 | 2022-03-04 | 国家电网有限公司 | Method and system for determining extra-high voltage direct current commutation failure accelerated protection strategy |
| CN111585280B (en) * | 2020-03-06 | 2021-07-06 | 山东大学 | Temporary power grid splitting method and system for blocking multi-direct-current commutation failure linkage |
| CN114389288B (en) * | 2022-01-13 | 2024-07-30 | 华北电力大学 | Self-adaptive emergency cutter-phase change sequence cooperative control method and system |
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