CN106385023B - A kind of Out of step off-the-line method based on branch potential energy - Google Patents
A kind of Out of step off-the-line method based on branch potential energy Download PDFInfo
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- CN106385023B CN106385023B CN201610845736.8A CN201610845736A CN106385023B CN 106385023 B CN106385023 B CN 106385023B CN 201610845736 A CN201610845736 A CN 201610845736A CN 106385023 B CN106385023 B CN 106385023B
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The Out of step off-the-line method based on branch potential energy that the invention discloses a kind of carries out off-line simulation by setting forecast failure, determines grid disconnection section；Solution list is generated according to grid disconnection section；The real-time transmission power and circuit branch road both ends busbar voltage phase angle of each branch are obtained by monitoring；Branch potential energy is obtained according to the real-time transmission power of each branch and circuit branch road both ends busbar voltage phase angle；And the real-time off-the-line index for obtaining branch is calculated according to the real-time transmission power of branch potential energy and each branch；Determine whether branch reaches solution column critical value online according to the real-time off-the-line index of each branch；The off-the-line instruction for reaching the branch of solution column critical value is determined according to solution list；Out-of-step solution method provided by the invention is cooperated by region islanding control center and provincial islanding control center, the information between disconnection device is set to share, under catastrophe failure when Out of step each off-the-line section can quick, reliable off-the-line, isolated fault, to ensure power grid security.
Description
Technical field
The invention belongs to operation of power networks control technology fields, more particularly, to a kind of electricity based on branch potential energy
Net out-of-step solution method.
Background technique
Power grid interconnects on a large scale is conducive to the distribution of resource and the raising of system stability, but is the safe operation band of power grid
Challenge is carried out.When electric system is by serious disturbance, stability may be destroyed, and system cannot keep synchronous operation.
Mains breakdown how is avoided at this time, ensures that important load power supply is most important.
In actual motion, current out-of-step solution method is judged based on measuring on the spot, based on the analysis results equips solution
It sets on the possible step-out section of the system of being installed on and to realize, when asynchronous oscillation occurs for system, disconnection device is by System Partition
At the synchronous isolated island of each self-sustaining.This out-of-step solution method is controlled with off-line calculation, in advance adjusting and cooperation, on the spot as spy
Sign；But there are the following problems for the out-of-step solution method:
(1) local amount information, the information sharing being not directed between disconnection device, meeting are only considered based on the disconnection device locally measured
Cause the disconnection device of same off-the-line section different location in different moments off-the-line, easily causes the migration of oscillation center；
(2) existing Out-of-Step Splitting Systems criterion does not account for influencing brought by oscillation center migration；Existing Out-of-Step Splitting Systems
Device is mounted between province on interconnection, if oscillation center is migrated to inside the province, disconnection device can not effectively be lost two
Step grid disconnection is opened.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of electricity based on branch potential energy
Net out-of-step solution method, its object is in solving to vibrate caused by different moments off-the-line due to the disconnection device of same section
The technical issues of heart migration bring disconnection device is unable to effective action.
To achieve the above object, according to one aspect of the present invention, a kind of power grid based on branch potential energy is provided
Out-of-step solution method includes the following steps:
(1) off-line simulation is carried out by setting forecast failure, determines grid disconnection section；It is generated according to grid disconnection section
Solve list；
(2) monitoring obtains the real-time transmission power and circuit branch road both ends busbar voltage phase angle of each branch；
(3) branch potential energy is obtained according to the real-time transmission power of each branch and branch both ends busbar voltage phase angle；And
The real-time off-the-line index for obtaining branch is calculated according to the real-time transmission power of branch potential energy and branch；
(4) determine whether branch reaches solution column critical value online according to the real-time off-the-line index of each branch；According to solution list
Determine the off-the-line instruction for reaching the branch of solution column critical value；It is instructed according to off-the-line and carries out Out of step off-the-line.
Preferably, the above-mentioned Out of step off-the-line method based on branch potential energy, step (1) includes following sub-step
It is rapid:
(1.1) for the dispatch area being made of each provincial power network, break the section for getting in touch with composition between province as off-the-line between saving
Face；
(1.2) forecast failure is arranged in the dispatch area constituted for power grid inside the province, carries out simulation calculation according to forecast failure and obtains
Obtain set generator power-angle curve inside the province；Judge the same tone of unit inside the province, according to the curve to determine off-the-line section inside the province.
Preferably, the above-mentioned Out of step off-the-line method based on branch potential energy, step (3) includes following sub-step
It is rapid:
(3.1) branch potential energy is obtained according to the real-time transmission power of branch
Wherein, k refers to branch number, PkRefer to the active power of kth circuit branch road conveying,When for pre-fault stable
The active power of k circuit branch road conveying, σkFor kth circuit branch road both ends bus voltage phase angle difference,For fault clearance moment kth
Circuit branch road both ends bus voltage phase angle difference；
(3.2) route off-the-line index is obtained according to branch potential energy
Wherein, k ∈ { 1 ..., l }；L refers to the maximum value of monitoring route number；tbkiIt is that kth circuit branch road potential energy i-th reaches
At the time of to maximum value, takiAt the time of being that kth circuit branch road potential-energy function i-th reaches minimum value.
Preferably, the above-mentioned Out of step off-the-line method based on branch potential energy, step (4) includes following sub-step
It is rapid:
(4.1) whether the off-the-line index of monitoring and each branch of real-time judge reaches solution column critical value；When the off-the-line of branch refers to
Whether mark not up to solution column critical value, then the off-the-line index for continuing monitoring and each branch of real-time judge reach solution column critical value；When
The off-the-line index of branch reaches solution column critical value, then enters step (4.2)；
(4.2) subregion where determining the branch for reaching solution column critical value；Subregion and solution list in conjunction with where branch
Determine that off-the-line instructs.
Preferably, the above-mentioned Out of step off-the-line method based on branch potential energy, in step (4.2),
If (a) branch for reaching solution column critical value on interconnection, is sent out between province by region islanding control center
Off-the-line is sent to instruct, off-the-line saves discontinuity surface accordingly, while sending the control life that off-the-line saves discontinuity surface to provincial islanding control center
It enables；
If (b) branch for reaching solution column critical value is inside the province, including following two sub-step:
(b.1) solution list is inquired by provincial islanding control center, judges off-the-line corresponding to provincial islanding control center
Whether section includes interconnection between province, if so, entering step (b.2)；If it is not, then entering step (b.3)；
(b.2) off-the-line instruction is sent by the off-the-line section that provincial islanding control center is controlled to the control centre, together
When to region islanding control center send off-the-line save between interconnection information；
(b.3) off-the-line instruction is issued by the off-the-line section that provincial islanding control center is controlled to the control centre, and
The information of off-the-line section inside the province is issued to region islanding control center.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) this method generates solution list according to provincial power network subregion and the inside the province thinking of people having the same aspiration and interest machine component group offline, in conjunction with
Branch transient potential energy step-out criterion proposes the real-time Out-of-Step Splitting Systems strategy suitable for power grid, which passes through region islanding control
The cooperation at center and provincial islanding control center makes off-the-line section same so that the information between disconnection device is shared
One moment can complete off-the-line, efficiently solve disconnection device oscillation center caused by different moments off-the-line of same section
The problem of migration bring disconnection device is unable to effective action, it is motionless to be also able to solve disconnection device when oscillation center is fallen in inside the province
The problem of making.
(2) it falls in since the present invention considers oscillation center inside the province between disconnection device the case where information sharing, by setting
It sets a large amount of forecast failure and carries out off-line simulation calculating, obtain the same tone of generating set inside the province, and then it is disconnected to obtain off-the-line inside the province
Face, while according to Branch Potential Energy step-out criterion, off-the-line instruction is unified to be issued by islanding control center, so that between different disconnection devices
It is able to information sharing；Therefore it can achieve the following beneficial effects:
Ensure to occur under power grid catastrophe failure the quick and precisely processing of step-out；It avoids leading because oscillation center is transferred to inside the province
Cause disconnection device that cannot correctly act；The process of on-line decision can understand system-wide multidate information in real time, guarantee power train
System safe operation.This method oscillation center caused by the movement of off-the-line criterion is inconsistent on the spot for solving same section different circuit
Migration and the unsuccessful problem of system sectionalizing have important practical significance.
Detailed description of the invention
Fig. 1 is the flow chart of the Out of step off-the-line method provided by the invention based on branch potential energy；
Fig. 2 is the islanding control central distribution schematic diagram in the embodiment of the present invention；
Fig. 3 is that the Central China Power Grid in the embodiment of the present invention saves discontinuity surface net topology figure；
Fig. 4 is the obtained Sichuan Province's generator's power and angle figure of offline digital simulation in the embodiment of the present invention
Fig. 5 is the off-the-line sectional schematic diagram of several example areas in the embodiment of the present invention；Wherein, (a) is Sichuan Province's off-the-line
The off-the-line section of control centre's control；(b) be Henan Province islanding control center control off-the-line section；It (c) is Hunan Province's off-the-line
The off-the-line section of control centre's control；(d) be Jiangxi Province islanding control center control off-the-line section；
Fig. 6 is in the embodiment of the present invention, and off-the-line changes after the section of Hubei Province each subsystem generator with respect to generator rotor angle figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Out of step off-the-line method provided by the invention based on branch potential energy, process is as shown in Figure 1, include such as
Lower step:
(1) off-line simulation is carried out by setting forecast failure, determines grid disconnection section；It is generated according to grid disconnection section
Solve list；
(2) monitoring obtains the real-time transmission power and circuit branch road both ends busbar voltage phase angle of each branch；
(3) branch potential energy is obtained according to the real-time transmission power of each branch and branch both ends busbar voltage phase angle；And
The real-time off-the-line index for obtaining branch is calculated according to the real-time transmission power of branch potential energy and branch；
(4) determine whether branch reaches solution column critical value online according to the real-time off-the-line index of each branch；According to solution list
Determine the off-the-line instruction for reaching the branch of solution column critical value；It is instructed according to off-the-line and carries out Out of step off-the-line.
With reference to embodiments, above-mentioned off-the-line method provided by the invention is specifically addressed, it is understood that
Invention is not limited thereto, and is applied equally to Out-of-Step Splitting Systems phenomenon caused by other region catastrophe failures of existing power grid.Implement
In example, single-phase tripping failure, which occurs, with Chongqing electricity grid L1 route in Central China Power Grid causes Chongqing of Sichuan-major network step-out, off-the-line to change Hubei Province section
For.
The Central China Power Grid out-of-step solution method based on branch potential energy that embodiment provides, specifically includes following step
It is rapid:
Step 1: determining the off-the-line section of Central China Power Grid, solution list is formed；The solution list includes off-the-line section and province between saving
Interior off-the-line section；
Interconnection between province can be thought weak section according to the thinking of scheduling subregion by off-the-line section between province, be solved between as saving
Column section；In off-the-line section inside the province according to the thinking of generator coherence grouping, the same tone of each provinces and regions generating set is identified, thus
Geographical location according to generator judges off-the-line section inside the province；In embodiment, Central China Power Grid solution list is obtained by off-line simulation
As shown in table 1 below.
1 Central China Power Grid solution list of table
Step 2: each branch transmission power of real-time monitoring, both ends bus phase angle；In Central China the whole network 1000kV, 500kV power transformation
Station is mounted on PMU (Phasor Measurement Unit, phasor measurement unit) device, which is used for real-time monitoring
Route transmission power and busbar voltage phase angle are sent to islanding control center.
Step 3: obtaining Branch Potential Energy letter according to the real-time transmission power of each branch and branch both ends busbar voltage phase angle
Number；And the real-time off-the-line index for obtaining each branch is calculated according to the real-time transmission power of branch potential energy and branch.
Step 4: the real-time off-the-line index according to each branch determines whether branch reaches solution column critical value online；According to solution
List determines the off-the-line instruction for reaching the branch of solution column critical value；Off-the-line instruction is executed, is instructed according to off-the-line and carries out Out of step
Off-the-line.
In the present embodiment, by the cooperation at provincial islanding control center and region islanding control center, calculating
When to off-the-line index and needing to take off-the-line measure by the judgement of off-the-line index, islanding control center inquiry solution list, and to phase
The islanding control center answered sends off-the-line instruction, executes off-the-line instruction.
It is of the invention that the improvement of the prior art is mainly reflected according to the think of for dispatching subregion, coherence grouping inside the province between province
Road generates Out-of-Step Splitting Systems table by offline digital simulation, and determines off-the-line scheme online.
In embodiment, emulation corresponding to out-of-step solution method provided by the invention has been built using simulation software PSASP
Example carries out simulating, verifying, is called using the user program of PSASP, will calculate Branch Potential Energy and off-the-line target procedure imports
To calculate the Branch Potential Energy and route off-the-line index of route in real time in the simulation example that PSASP is built.
In this example, using the expected wet season summer data of Central China Power Grid in 2017；Central China Power Grid and North China Power Telecommunication Network are logical
Cross extra-high voltage contact line locking networking, while 6 provincial dispatch areas of Central China Power Grid point；The corresponding islanding control center of the present embodiment
Distribution schematic diagram as shown in Fig. 2, islanding control center includes region islanding control center and provincial islanding control center, the two it
Between information sharing.In embodiment, the grid structure figure of Central China Power Grid is as shown in figure 3, include Central China Dong Sisheng and Chongqing of Sichuan Er Sheng.
The step of generator coherence grouping is described in detail in the present embodiment by taking Sichuan Province as an example；Envisioned by the way that Sichuan Province is arranged
Failure, the generator's power and angle curve obtained by analyzing emulation, it can be determined that the same tone of Sichuan Province's generating set；Wherein, in advance
Thinking failure mainly includes the failure that can cause Sichuan Province's generator step-out；
It is the power-angle curve of Sichuan generating set shown in Fig. 4, can be found that Sichuan Electric Power Network can be divided into 4 sub-districts from the figure
Domain, including North-West Sichuan, Chuan Nan, Pubugou Project unit and NE Sichuan region；Solution corresponding, that Sichuan islanding control center is controlled
Shown in column section such as Fig. 5 (a)；Shown in off-the-line section such as Fig. 5 (b) that Henan islanding control center is controlled；Hunan islanding control
Shown in off-the-line section such as Fig. 5 (c) that center is controlled；Off-the-line section such as Fig. 5 (d) institute that Jiangxi islanding control center is controlled
Show.
When at the 1s moment three phase short circuit fault, single-phase switch tripping, failure protection occur for Chongqing electricity grid internal wiring L1
400ms movement, causes big vast one loop line road tripping of plate；The off-the-line result obtained using existing disconnection device model is as listed by the following table 2；
The existing disconnection device action situation of table 2
| The off-the-line moment/s | Off-the-line section | Solve column line |
| 2.74 | Change Hubei Province section | Open grace line |
| 3.16 | Central China North China section | Long south line |
| 5.83 | Change Hubei Province section | Interwined dragon line |
Using the Out-of-Step Splitting Systems criterion provided by the invention based on branch potential energy, the part as listed by the following table 3 is obtained
The Out-of-Step Splitting Systems index of branch.
Part route off-the-line index obtained by 3 islanding control center calculation of table
Using traditional disconnection device, the results showed that, in 2.74s moment grace line off-the-line, (change interwined dragon line Hubei Province section at this time
Another loop line) do not disconnect, oscillation center is simultaneously not transferred to interwined dragon line, and is transferred into long southern line (Central China North China section),
3.16s the moment, long southern line disconnected.
Region islanding control center calculates a grace line at the 1.76s moment and reaches off-the-line standard, inquiry solution list, homographic solution
Column strategy number is 03, and after the delay of 1s, the moment region 2.76s islanding control center will Chongqing Hubei Province section (interwined dragon line, Zhang En
Line) off-the-line, each subsystem generator is as shown in Figure 6 with respect to generator rotor angle figure after off-the-line；As shown in the figure, after off-the-line each subsystem hair
Motor is able to maintain in normal operation range with respect to generator rotor angle, illustrates that two subsystems can maintain synchronous operation, due to off-the-line
The centralized control of control centre, interwined dragon line and grace line avoid oscillation center and migrate to elsewhere in synchronization off-the-line
The case where, enable the system to fast quick-recovery stable operation.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of Out of step off-the-line method based on branch potential energy, which comprises the steps of:
(1) off-line simulation is carried out by setting forecast failure and determines grid disconnection section；It is generated according to the grid disconnection section
Solve list；
(2) monitoring obtains the real-time transmission power and circuit branch road both ends busbar voltage phase angle of each branch；
(3) branch potential energy is obtained according to the real-time transmission power of each branch and circuit branch road both ends busbar voltage phase angle；And
The real-time off-the-line index for obtaining branch is calculated according to branch potential energy and the real-time transmission power of branch；
(4) determine whether branch reaches solution column critical value online according to the real-time off-the-line index of each branch；According to the solution list
Determine the off-the-line instruction for reaching the branch of solution column critical value；It is instructed according to off-the-line and carries out Out of step off-the-line；
The step (1) includes following sub-step:
(1.1) for the dispatch area being made of each provincial power network, using the section for getting in touch with composition between province as off-the-line section between saving；
(1.2) forecast failure is arranged in the dispatch area constituted for power grid inside the province；And simulation calculation acquisition is carried out according to forecast failure
Set generator power-angle curve inside the province；Judge the same tone of unit inside the province, according to the curve to determine off-the-line section inside the province.
2. Out of step off-the-line method as described in claim 1, which is characterized in that the step (3) includes following sub-step:
(3.1) branch potential energy is obtained according to the real-time transmission power of branch
Wherein, k refers to branch number, PkRefer to the active power of kth circuit branch road conveying,Kth route when for pre-fault stable
The active power of branch conveying, σkFor kth circuit branch road both ends bus voltage phase angle difference,For fault clearance moment kth route
Branch both ends bus voltage phase angle difference；
(3.2) route off-the-line index is obtained according to the branch potential energy
Wherein, k ∈ { 1 ..., l }；L refers to the maximum value of monitoring route number；tbkiIt is that kth circuit branch road potential energy i-th reaches most
At the time of big value, takiAt the time of being that kth circuit branch road potential-energy function i-th reaches minimum value.
3. Out of step off-the-line method as described in claim 1, which is characterized in that (4) include following sub-step:
(4.1) whether the off-the-line index of monitoring and each branch of real-time judge reaches solution column critical value；When branch off-the-line index not
Reach solution column critical value, then whether the off-the-line index for continuing monitoring and each branch of real-time judge reaches solution column critical value；Work as branch
Off-the-line index reach solution column critical value, then enter step (4.2)；
(4.2) subregion where determining the branch for reaching solution column critical value；Subregion and solution list determine in conjunction with where branch
Off-the-line instruction.
4. Out of step off-the-line method as claimed in claim 3, which is characterized in that in the step (4.2),
If (a) branch for reaching solution column critical value on interconnection, sends solution by region islanding control center between province
Column instruction, off-the-line saves discontinuity surface accordingly, while sending the control command that off-the-line saves discontinuity surface to provincial islanding control center；
If (b) branch for reaching solution column critical value is inside the province, including following two sub-step:
(b.1) solution list is inquired by provincial islanding control center, judges off-the-line section corresponding to provincial islanding control center
Whether comprising interconnection between saving, if so, entering step (b.2)；If it is not, then entering step (b.3)；
(b.2) off-the-line is sent by the off-the-line section that provincial islanding control center is controlled to the control centre to instruct, while to
Region islanding control center sends the information of interconnection between off-the-line province；
(b.3) the off-the-line section controlled to the control centre by provincial islanding control center issues off-the-line instruction, and to area
Domain islanding control center issues the information of off-the-line section inside the province.
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| CN111864747A (en) * | 2020-08-13 | 2020-10-30 | 国网黑龙江省电力有限公司电力科学研究院 | Power grid oscillation splitting judgment method taking voltage as criterion |
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| CN103199527A (en) * | 2013-04-03 | 2013-07-10 | 上海电力学院 | Strong-connection power grid out-of-step disconnection method |
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| CN103199527A (en) * | 2013-04-03 | 2013-07-10 | 上海电力学院 | Strong-connection power grid out-of-step disconnection method |
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