CN103208819A - Micro-grid grid-connected operation control method and system - Google Patents
Micro-grid grid-connected operation control method and system Download PDFInfo
- Publication number
- CN103208819A CN103208819A CN2013101407608A CN201310140760A CN103208819A CN 103208819 A CN103208819 A CN 103208819A CN 2013101407608 A CN2013101407608 A CN 2013101407608A CN 201310140760 A CN201310140760 A CN 201310140760A CN 103208819 A CN103208819 A CN 103208819A
- Authority
- CN
- China
- Prior art keywords
- frequency
- electrical network
- value
- performance number
- common connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Inverter Devices (AREA)
Abstract
A micro-grid grid-connected operation control method includes obtaining the frequency value and the power value of a common connection point of a large grid and micro-grids when a large number of micro-grids are connected with the large grid; determining whether the frequency value and the power value meet disconnection requirements, that is, the frequency value is smaller than a preset first frequency value and the power value is larger than zero or the frequency value is larger than a preset second frequency value and the power value is smaller than zero; and disconnecting the common connection point if the frequency value and the power value meet the disconnection requirements. When the large grid disturbance occurs, the frequency of the large grid can be recovered quickly and the security of the large grid can be improved through the removal of the micro-grids to eliminate the influence of the micro-grids on the frequency fluctuations of the large grid. The invention also provides a micro-grid grid-connected operation control system.
Description
Technical field
The present invention relates to the electric power network technique field, particularly relate to a kind of little electrical network be incorporated into the power networks control method and system.
Background technology
Little electrical network is made of distributed power source, load and electrical power trans mission/distribution system, can independent operating or be incorporated into the power networks with big electrical network, have a miniature electric power system to internal electric source and load coordination optimization control function.Little electrical network is incorporated into the power networks and refers to little electrical network and big electrical network paired running by the power supply of big unit, namely with conventional power distribution network on major loop by being electrically connected, tie point is commonly referred to as PCC(point of common coupling, points of common connection).
When single little electrical network was incorporated big electrical network into, because little electrical network is small, big electrical network was not generally considered the spinning reserve of little electrical network.Higher when the permeability of little electrical network, namely have a large amount of little electrical networks to incorporate big electrical network into after, when electric power system was disturbed, little electrical network can increase the weight of the fault order of severity, reduced the fail safe of big electrical network.
Summary of the invention
Based on this, when being necessary to provide a kind of a large amount of little electrical network to incorporate big electrical network into, the little electrical network that guarantees big electric network security be incorporated into the power networks control method and system.
A kind of little electrical network control method that is incorporated into the power networks may further comprise the steps:
Obtain frequency values and the performance number of the points of common connection of big electrical network and little electrical network;
Judging whether described frequency values and performance number satisfy disconnects requirement, described disconnection require for described frequency values less than default first frequency value, and described performance number is greater than zero; Or described frequency values is greater than default second frequency value, and described performance number is less than zero; Described first frequency value is less than described second frequency value;
If then disconnect described points of common connection.
Among embodiment, if described frequency values and performance number satisfy described disconnection requirement, may further comprise the steps before the step of the described points of common connection of described disconnection therein:
Obtain the frequency slip frequency of described points of common connection;
Judge whether described frequency slip frequency surpasses default slippage threshold value;
If not, then carry out the step of the described points of common connection of described disconnection.
Among embodiment, if described frequency values and performance number satisfy described disconnection requirement, may further comprise the steps before the step of the described points of common connection of described disconnection therein:
Obtain described frequency values satisfies described disconnection requirement in Preset Time read-around ratio or time;
Judge whether described read-around ratio or time surpass predetermined value;
If then carry out the step of the described points of common connection of described disconnection.
Therein among embodiment, if described frequency values is less than described first frequency value, and described performance number may further comprise the steps after the step of the described points of common connection of described disconnection greater than zero:
Obtain the frequency of described big electrical network;
Judge that whether described frequency is less than load group corresponding preset frequency values; Described load group corresponding preset frequency values is less than described first frequency value;
If then disconnect the tie point of described load group and described big electrical network.
Therein among embodiment, if described frequency values is greater than described second frequency value, and described performance number may further comprise the steps after the step of the described points of common connection of described disconnection less than zero:
Obtain the frequency of described big electrical network;
Judge that described frequency is whether greater than the setpoint frequency value of generating set correspondence; The setpoint frequency value of described generating set correspondence is greater than described second frequency value;
If then disconnect the tie point of described generating set and described big electrical network.
A kind of little electrical network control system that is incorporated into the power networks comprises:
Acquisition module is for frequency values and the performance number of the points of common connection that obtains big electrical network and little electrical network;
Judge module is used for judging whether described frequency values and performance number satisfy disconnects requirement, described disconnection require for described frequency values less than default first frequency value, and described performance number is greater than zero; Or described frequency values is greater than default second frequency value, and described performance number is less than zero; Described first frequency value is less than described second frequency value;
Disconnect module, be used for satisfying in described frequency values and performance number and disconnect described points of common connection when described disconnection requires.
Therein among embodiment, described little electrical network control system that is incorporated into the power networks comprises:
The slippage acquisition module is used for obtaining the frequency slip frequency of described points of common connection when described frequency values and performance number satisfy described disconnection and require;
The slippage judge module is used for judging whether described frequency slip frequency surpasses default slippage threshold value; And when described frequency slip frequency surpasses described slippage threshold value, control described disconnection module and disconnect described points of common connection.
Therein among embodiment, described little electrical network control system that is incorporated into the power networks comprises:
The time-delay acquisition module is used for obtaining described frequency values satisfies described disconnection requirement in Preset Time read-around ratio or time when described frequency values and performance number satisfy described disconnection and require;
The time-delay judge module is used for judging whether described read-around ratio or time surpass predetermined value; And when described read-around ratio or time surpass described predetermined value, control described disconnection module and disconnect described points of common connection.
Therein among embodiment, described little electrical network control system that is incorporated into the power networks comprises:
The low frequency acquisition module is used at described frequency values less than described first frequency value, and described performance number after described disconnection module disconnects described points of common connection, is obtained the frequency of described big electrical network greater than zero the time;
The load group disconnects module, is used for judging that whether described frequency is less than load group corresponding preset frequency values; And disconnect the tie point of described load group and described big electrical network during less than described load group corresponding preset frequency values in described frequency; Described load group corresponding preset frequency values is less than described first frequency value.
Therein among embodiment, described little electrical network control system that is incorporated into the power networks comprises:
The high frequency acquisition module is used at described frequency values greater than described second frequency value, and described performance number after described disconnection module disconnects described points of common connection, is obtained the frequency of described big electrical network less than zero the time;
Generating set disconnects module, is used for judging that described frequency is whether greater than the setpoint frequency value of generating set correspondence; And disconnect the tie point of described generating set and described big electrical network during greater than the setpoint frequency value of described generating set correspondence in described frequency; The setpoint frequency value of described generating set correspondence is greater than described second frequency value.
Above-mentioned little electrical network be incorporated into the power networks control method and system, when a large amount of little electrical networks was incorporated big electrical network into, acquisition module obtained frequency values and the performance number of the points of common connection of big electrical network and little electrical network; Whether judge module determination frequency value and performance number satisfy and disconnect requirement, namely frequency values less than default first frequency value and performance number greater than zero, or frequency values greater than default second frequency value and performance number less than zero; Disconnect module and disconnect points of common connection when requiring at frequency values and satisfied disconnection of performance number.When big electrical network generation disturbance, by excising little electrical network, eliminate little electrical network to the frequency fluctuation influence of big electrical network, the big mains frequency of quick-recovery soon, the fail safe that improves big electrical network.
Description of drawings
Fig. 1 is the be incorporated into the power networks flow chart of control method of little electrical network among the embodiment;
Fig. 2 is the be incorporated into the power networks flow chart of control method of little electrical network among another embodiment;
Fig. 3 is the be incorporated into the power networks structure chart of control system of little electrical network among the embodiment;
Fig. 4 is the be incorporated into the power networks structure chart of control system of little electrical network among another embodiment.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
The invention provides a kind of little electrical network control method that is incorporated into the power networks, as shown in Figure 1, may further comprise the steps:
Step S110: frequency values and the performance number of obtaining the points of common connection of big electrical network and little electrical network.
Little electrical network is connected with big electrical network by points of common connection, and a plurality of little electrical networks can be formed a bigger little electrical network and connect big electrical network by points of common connection, also can connect big electrical network by different points of common connection separately.Detect frequency values and the performance number of the points of common connection of big electrical network and little electrical network, can learn the state of big electrical network and little electrical network, detect performance number greater than zero as working as, namely points of common connection power flows to little electrical network by big electrical network, and this moment, little electrical network was in load condition for big electrical network; If the detection power value is less than zero, namely points of common connection power flows to big electrical network by little electrical network, and this moment, little electrical network was in power supply status for big electrical network.Can be to regard all little electrical networks of incorporating big electrical network into as a little electrical network group in the present embodiment, also can be with the little electrical network of the part of incorporating big electrical network into as little electrical network group, judge whether to need the little electrical network group of excision by subsequent step.
Step S120: whether determination frequency value and performance number satisfy disconnects requirement.
Present embodiment breaks and requires to frequency values less than default first frequency value and performance number greater than zero; Or frequency values greater than default second frequency value and performance number less than zero.Wherein the first frequency value is less than the second frequency value, and all can adjust according to actual conditions.Disconnect requirement if frequency values and performance number satisfy, then carry out step S170; If do not satisfy, then do not carry out step S170, little electrical network can be incorporated into the power networks on a large scale, allows by big mains supply, to improve the power supply reliability of little electrical network; And allow little electrical network to big mains supply, to improve the utilance of generation of electricity by new energy.
Step S170: disconnect points of common connection.
Disconnect when requiring when big electrical network satisfies in the frequency values of points of common connection and performance number, disconnect the points of common connection of little electrical network and big electrical network in little electrical network group, little electrical network group is excised from big electrical network, the little electrical network in little electrical network group changes lonely network operation pattern over to.
Above-mentioned little electrical network control method that is incorporated into the power networks when a large amount of little electrical networks is incorporated big electrical network into, is at first obtained frequency values and the performance number of the points of common connection of big electrical network and little electrical network.Whether determination frequency value and performance number satisfy and disconnect requirement then, namely frequency values less than default first frequency value and performance number greater than zero, or frequency values greater than default second frequency value and performance number less than zero.If satisfying to disconnect, frequency values and performance number require then to disconnect points of common connection.When big electrical network generation disturbance, by the little electrical network of preferential excision, eliminate little electrical network to the frequency fluctuation influence of big electrical network, the big mains frequency of quick-recovery soon, the fail safe that improves big electrical network.
Above-mentioned little electrical network control method that is incorporated into the power networks, utilize little electrical network can be incorporated into the power networks and two kinds of patterns of lonely net between the characteristics changed, when big electrical network generation disturbance causes frequency change, with little electrical network excision, ensure the fail safe of the big electrical network under little electrical network high permeability earlier.Avoid at first excising other loads of big electrical network, avoid the load loss of big electrical network as far as possible.After disconnecting points of common connection, little electrical network enters lonely network operation pattern, and its inside still can guarantee the power supply of responsible consumer, has ensured the power supply reliability to important load.Do not disconnect requirement if frequency values and performance number do not satisfy, then can not disconnect points of common connection, ensured being incorporated into the power networks of little electrical network clean energy resource, for big network system provides the clean energy resource supply.
After disconnecting points of common connection, can the little electrical network internal frequency that change lonely network operation pattern over to be tended towards stability by adjustment, after the frequency of big electrical network and little electrical network is all stablized, can also comprise the step that connects points of common connection, make little electrical network enter the pattern of being incorporated into the power networks again.
Among embodiment, as shown in Figure 2, disconnect requirement if frequency values and performance number satisfy therein, can may further comprise the steps before the step S170:
Step S130: the frequency slip frequency that obtains points of common connection.
Specifically comprise two kinds of situations: when frequency values less than the first frequency value, and performance number obtains the frequency decline slippage of points of common connection greater than zero the time, can be designated as first slippery difference at this; When frequency values greater than the second frequency value, and performance number obtains the frequency rising slippage of points of common connection less than zero the time, can be designated as second slippery difference at this.
Step S140: whether the determination frequency slippage surpasses default slippage threshold value.
If frequency slip frequency does not surpass the slippage threshold value, then carry out step S170.If frequency slip frequency surpasses the slippage threshold value, then do not carry out step S170.
S130 is corresponding with step, and step S140 also can comprise two kinds of situations: when frequency values less than the first frequency value, and performance number judges whether first slippery difference surpasses the first default slippage threshold value greater than zero the time; When frequency values greater than the second frequency value, and performance number judges whether second slippery difference surpasses the second default slippage threshold value less than zero the time.Be appreciated that the size of the first default slippage threshold value and the second default slippage threshold value can be identical also can be different, and can adjust according to actual conditions.
Described step S130 and step S140 are provided with the frequency slip frequency locking, by step S130 and step S140, avoid big electrical network transient fault, the malfunction as short trouble, generating set tripping operation, load switching equifrequent abnormal conditions may cause improves operating reliability.
Continuation is with reference to Fig. 2, among embodiment, disconnects requirement if frequency values and performance number satisfy therein, also can may further comprise the steps before the step S170:
Step S150: obtain frequency values satisfies the disconnection requirement in Preset Time read-around ratio or time.
Same step S150 can comprise two kinds of situations: if frequency values less than first frequency value and performance number greater than zero, then in first Preset Time, detect frequency values less than read-around ratio or the time of first frequency value, can be designated as first read-around ratio or time at this; If frequency values less than zero, then detects frequency values greater than read-around ratio or the time of second frequency value greater than second frequency value and performance number in second Preset Time, can be designated as second read-around ratio or time at this.First Preset Time and second Preset Time can be identical also can be different, and can adjust according to actual conditions.
Step S160: judge whether read-around ratio or time surpass predetermined value.
If read-around ratio or time surpass predetermined value, then carry out step S170.If read-around ratio or time do not surpass predetermined value, then do not carry out step S170.
S150 is corresponding with step, and step S160 also can comprise two kinds of situations: when frequency values less than the first frequency value, and performance number judges then whether first read-around ratio or time surpass first predetermined value greater than zero the time; When frequency values greater than the second frequency value, and performance number judges then whether second read-around ratio or time surpass second predetermined value less than zero the time.Be appreciated that first predetermined value and second predetermined value can be identical also can be different, and can adjust according to actual conditions.
By step S150 and step S160, after frequency values and the satisfied disconnection requirement of performance number, judge frequency values satisfies the disconnection requirement in Preset Time read-around ratio or time, whether above predetermined value.If then carry out step S170, can avoid the malfunction that causes owing to big electrical network transient fault equally, improve operating reliability.
Be appreciated that therein among the embodiment that little electrical network control method that is incorporated into the power networks also can comprise step S130, step S140, step S150 and step S160 simultaneously, can further avoid malfunction, improves operating reliability.Can be to carry out step S150 and step S160 after step S140 determination frequency slippage does not surpass the slippage threshold value, also can be to judge after read-around ratio or time surpass predetermined value at step S160 to carry out step S130 and step S140.
In addition, therein among embodiment, if frequency values is less than the first frequency value, and performance number can may further comprise the steps after the step S170 greater than zero:
Obtain the frequency of big electrical network.
Whether determination frequency is less than load group corresponding preset frequency values.
If then disconnect the tie point of load group and big electrical network.
Can with big electrical network wherein sub-load be divided into a plurality of load groups, load in the load group can all be the electricity consumption object of big electrical network, perhaps all be that other also are in little electrical network of the pattern of being incorporated into the power networks to step S170 afterwards, the load group can also be both to have comprised the electricity consumption object, also comprises little electrical network of the pattern of being incorporated into the power networks.The corresponding predeterminated frequency value of each load group, each predeterminated frequency value reduce and gradually all less than the first frequency value.Can divide into groups by the load significance level, as most important load being divided in the minimum load group of predeterminated frequency value, the load branch that can preferentially excise is in the highest load group of predeterminated frequency.
For ease of understanding, can be the first load group by its predeterminated frequency value order from high to low group # of will loading with each load group at this, the second load group ....Because after process step S170 excised little electrical network group, the frequency of big electrical network can change, and can obtain the frequency of big electrical network over time.At first with the predeterminated frequency value of the frequency obtained and the first load group relatively, if the frequency of obtaining need not excised load greater than the predeterminated frequency value of the first load group; If the frequency of obtaining is less than the predeterminated frequency value of the first load group, then disconnect the tie point of the first load group and big electrical network, equally can be over time, again obtain the frequency of big electrical network, and the predeterminated frequency value of the frequency that will obtain again and the second load group relatively, if the frequency of obtaining greater than the predeterminated frequency value of the second load group, has then satisfied the excision requirement of big electrical network after the explanation disconnection first load group, do not need to excise again load; If the frequency of obtaining less than the predeterminated frequency value of the second load group, then disconnects the tie point of the second load group and big electrical network, and the like, until the excision requirement of satisfying big electrical network.The grouping of will loading is excised, and can avoid excessive excision load.
If frequency values is less than load group corresponding preset frequency values relatively, also can carry out the operation of similar step S150 and step S160, whether judgement frequency values in Preset Time surpasses predetermined value less than the read-around ratio of load group corresponding preset frequency values or time, if then excise this load group, improve operating reliability.
If the frequency values that obtains is greater than the second frequency value, and performance number also can may further comprise the steps after the step S170 less than zero:
Obtain the frequency of big electrical network.
Whether determination frequency is greater than the setpoint frequency value of generating set correspondence.
If then disconnect the tie point of generating set and big electrical network.
Can with big electrical network wherein the part generator be divided into a plurality of generating sets, it can all be the generator of big electrical network in the generating set, as gas electricity generator, hydroelectricity generator, pneumoelectric generator etc., perhaps all be that other also are in little electrical network of the pattern of being incorporated into the power networks to step S170 afterwards, generating set can also be both to have comprised generator, also comprises little electrical network of the pattern of being incorporated into the power networks.The corresponding setpoint frequency value of each generating set, each setpoint frequency value raise and gradually all greater than the second frequency value.Can divide into groups by the generator type, as the generator branch that can excise earlier in the minimum generating set of setpoint frequency.
For ease of understanding, each generating set can be numbered first generating set by its setpoint frequency value order from low to high with generating set at this, second generating set ....Because after process step S170 excised little electrical network group, the frequency of big electrical network can change, and can obtain the frequency of big electrical network over time.At first with the setpoint frequency value of the frequency obtained and first generating set relatively, if the frequency of obtaining need not excised power supply less than the setpoint frequency value of first generating set; If the frequency of obtaining is greater than the setpoint frequency value of first generating set, then disconnect the tie point of first generating set and big electrical network, equally can be over time, again obtain the frequency of big electrical network, and the setpoint frequency value of the frequency that will obtain again and second generating set relatively, if the frequency of obtaining less than the setpoint frequency value of second generating set, has then satisfied the excision requirement of big electrical network behind explanation disconnection first generating set, do not need to excise again power supply; If the frequency of obtaining greater than the setpoint frequency value of second generating set, then disconnects the tie point of second generating set and big electrical network, and the like, until the excision requirement of satisfying big electrical network.The generator grouping is excised, can avoid excessive excision power supply.
If frequency values is greater than the setpoint frequency value of generating set correspondence relatively, also can carry out the operation of similar step S150 and step S160, whether judgement frequency values in Preset Time surpasses predetermined value greater than the read-around ratio of the setpoint frequency value of generating set correspondence or time, if then excise this generating set, improve operating reliability.
In addition, the present invention also provides a kind of little electrical network control system that is incorporated into the power networks, and as shown in Figure 3, comprises acquisition module 110, judge module 120 and disconnects module 170.
Little electrical network is connected with big electrical network by points of common connection, and a plurality of little electrical networks can be formed a bigger little electrical network and connect big electrical network by points of common connection, also can connect big electrical network by different points of common connection separately.Detect frequency values and the performance number of the points of common connection of big electrical network and little electrical network, can learn the state of big electrical network and little electrical network, detect performance number greater than zero as working as, namely points of common connection power flows to little electrical network by big electrical network, and this moment, little electrical network was in load condition for big electrical network; If detect performance number less than zero, namely points of common connection power flows to big electrical network by little electrical network, and this moment, little electrical network was in power supply status for big electrical network.Can be to regard all little electrical networks of incorporating big electrical network into as a little electrical network group in the present embodiment, also can be with the little electrical network of the part of incorporating big electrical network into as little electrical network group, judge whether to need the little electrical network group of excision by subsequent step.
Present embodiment break require for frequency values less than default first frequency value, and performance number is greater than zero; Or frequency values is greater than default second frequency value, and performance number is less than zero.The first frequency value is less than the second frequency value, and all can adjust according to actual conditions.
Disconnecting module 170 is used for disconnecting points of common connection when requiring at frequency values and satisfied disconnection of performance number.
Disconnect requirement if frequency values and performance number satisfy, then disconnect the points of common connection that module 170 disconnects little electrical network and big electrical network in little electrical network group, little electrical network group is excised from big electrical network, the little electrical network in little electrical network group changes lonely network operation pattern over to.If do not satisfy, then disconnect module 170 and do not carry out opening operation, little electrical network can be incorporated into the power networks on a large scale, allows by big mains supply, to improve the power supply reliability of little electrical network; And allow little electrical network to big mains supply, to improve the utilance of generation of electricity by new energy.
Above-mentioned little electrical network control system that is incorporated into the power networks, when a large amount of little electrical networks was incorporated big electrical network into, acquisition module 110 obtained frequency values and the performance number of the points of common connection of big electrical network and little electrical network; Judging whether 120 determination frequency values of mould and performance number satisfy disconnects requirement, namely frequency values less than default first frequency value and performance number greater than zero, or frequency values greater than default second frequency value and performance number less than zero; Disconnect module 170 and disconnect points of common connection when requiring at frequency values and satisfied disconnection of performance number.When big electrical network generation disturbance, by excising little electrical network, eliminate little electrical network to the frequency fluctuation influence of big electrical network, the big mains frequency of quick-recovery soon, the fail safe that improves big electrical network.
Above-mentioned little electrical network control system that is incorporated into the power networks, utilize little electrical network can be incorporated into the power networks and two kinds of patterns of lonely net between the characteristics changed, when big electrical network generation disturbance causes frequency change, with little electrical network excision, ensure the fail safe of the big electrical network under little electrical network high permeability earlier.Avoid at first excising the load of big electrical network, avoid the load loss of big electrical network as far as possible.After disconnecting points of common connection, little electrical network enters lonely network operation pattern, and its inside still can guarantee the power supply of responsible consumer, has ensured the power supply reliability to important load.Do not disconnect requirement if frequency values and performance number do not satisfy, then can not disconnect points of common connection, ensured being incorporated into the power networks of little electrical network clean energy resource, for big network system provides the clean energy resource supply.
Little electrical network control system that is incorporated into the power networks also can comprise adjusting module and link block, adjusting module is after disconnecting module 170 disconnection points of common connection, the little electrical network internal frequency that changes over to after the lonely network operation pattern is tended towards stability, link block is after the frequency of big electrical network and little electrical network is all stablized, connect points of common connection, make little electrical network enter the pattern of being incorporated into the power networks again, in other embodiments also can be by manually connecting points of common connection.
Therein among embodiment, as shown in Figure 4, little electrical network control system that is incorporated into the power networks can comprise slippage acquisition module 130 and slippage judge module 140.
Specifically comprise two kinds of situations: when frequency values less than the first frequency value, and performance number obtains the frequency decline slippage of points of common connection greater than zero the time, can be designated as first slippery difference at this; When frequency values greater than the second frequency value, and performance number obtains the frequency rising slippage of points of common connection less than zero the time, can be designated as second slippery difference at this.
Accordingly, also can comprise two kinds of situations: when frequency values less than the first frequency value, and performance number judges whether first slippery difference surpasses the first default slippage threshold value greater than zero the time; When frequency values greater than the second frequency value, and performance number judges whether second slippery difference surpasses the second default slippage threshold value less than zero the time.Be appreciated that the size of the first default slippage threshold value and the second default slippage threshold value can be identical also can be different, and can adjust according to actual conditions.
The effect of slippage acquisition module 130 and slippage judge module 140 namely is to be provided with the frequency slip frequency locking, avoid big electrical network transient fault, malfunction as short trouble, generating set tripping operation, load switching equifrequent abnormal conditions may cause improves operating reliability.
Continuation is with reference to Fig. 4, and therein among embodiment, little electrical network control system that is incorporated into the power networks also can comprise time-delay acquisition module 150 and time-delay judge module 160.
Time-delay acquisition module 150 is used for satisfying in frequency values and performance number and disconnects when requiring, and obtains that frequency values satisfies read-around ratio or the time that requires that disconnects in Preset Time.
Comprise two kinds of situations equally: if frequency values less than first frequency value and performance number greater than zero, then in first Preset Time, detect frequency values less than read-around ratio or the time of first frequency value, can be designated as first read-around ratio or time at this; If frequency values less than zero, then detects frequency values greater than read-around ratio or the time of second frequency value greater than second frequency value and performance number in second Preset Time, can be designated as second read-around ratio or time at this.First Preset Time and second Preset Time can be identical also can be different, and can adjust according to actual conditions.
Time-delay judge module 160 is used for judging whether read-around ratio or time surpass predetermined value; And control disconnects module 170 and disconnects points of common connection when read-around ratio or time surpass predetermined value.
Accordingly, also can comprise two kinds of situations: when frequency values less than the first frequency value, and performance number judges then whether first read-around ratio or time surpass first predetermined value greater than zero the time; When frequency values greater than the second frequency value, and performance number judges then whether second read-around ratio or time surpass second predetermined value less than zero the time.Be appreciated that first predetermined value and second predetermined value can be identical also can be different, and can adjust according to actual conditions.
By acquisition module 150 and the time-delay judge module 160 of delaying time, after frequency values and the satisfied disconnection requirement of performance number, judge frequency values satisfies the disconnection requirement in Preset Time read-around ratio or time, whether above predetermined value.If then control disconnects module 170 and disconnects points of common connection, can avoid because the malfunction that big electrical network transient fault causes the raising operating reliability equally.
Be appreciated that, therein among embodiment, little electrical network is incorporated into the power networks, and control system also can comprise slippage acquisition module 130, slippage judge module 140 simultaneously, delay time acquisition module 150 and time-delay judge module 160, can further avoid malfunction, improves operating reliability.Can be after slippage judge module 140 determination frequency slippages do not surpass the slippage threshold value, time-delay acquisition module 150 obtains read-around ratio or the time that frequency values satisfies the disconnection requirement in Preset Time, also can be that slippage acquisition module 130 obtains the frequency slip frequency of points of common connection after time-delay judge module 160 judges that read-around ratio or time surpass predetermined value.
In addition, therein among embodiment, little electrical network control system that is incorporated into the power networks can comprise that low frequency acquisition module and load group disconnect module.
The low frequency acquisition module, be used for frequency values less than first frequency value and performance number greater than zero the time, after disconnecting module 170 and disconnecting points of common connection, obtain the frequency of big electrical network.
The load group disconnects module and whether is used for determination frequency less than load group corresponding preset frequency values; And disconnect the tie point of load group and big electrical network during less than load group corresponding preset frequency values in frequency.
Can with big electrical network wherein sub-load be divided into a plurality of load groups, load in the load group can all be the electricity consumption object of big electrical network, perhaps all be that other also are in little electrical network of the pattern of being incorporated into the power networks to the little electrical network group of disconnection module 170 excisions afterwards, the load group can also be both to have comprised the electricity consumption object, also comprises little electrical network of the pattern of being incorporated into the power networks.The corresponding predeterminated frequency value of each load group, each predeterminated frequency value reduce and gradually all less than the first frequency value.Can divide into groups by the load significance level, as most important load being divided in the minimum load group of predeterminated frequency value, the load branch that can preferentially excise is in the highest load group of predeterminated frequency.
For ease of understanding, can be the first load group by its predeterminated frequency value order from high to low group # of will loading with each load group at this, the second load group ....Because after disconnecting the little electrical network group of module 170 excisions, the frequency of big electrical network can change, and can obtain the frequency of big electrical network over time.At first with the predeterminated frequency value of the frequency obtained and the first load group relatively, if the frequency of obtaining need not excised load greater than the predeterminated frequency value of the first load group; If the frequency of obtaining is less than the predeterminated frequency value of the first load group, then disconnect the tie point of the first load group and big electrical network, equally can be over time, again obtain the frequency of big electrical network, and the predeterminated frequency value of the frequency that will obtain again and the second load group relatively, if the frequency obtained, illustrate the excision requirement of having satisfied big electrical network after the disconnection first load group greater than the predeterminated frequency value of the second load group, do not need to excise again load; If the frequency of obtaining less than the predeterminated frequency value of the second load group, then disconnects the tie point of the second load group and big electrical network, and the like, until the excision requirement of satisfying big electrical network.The grouping of will loading is excised, and can avoid excessive excision load.
If frequency values is less than load group corresponding preset frequency values relatively, also can be by time-delay acquisition module 150 and time-delay judge module 160, whether judgement frequency values in Preset Time surpasses predetermined value less than the read-around ratio of load group corresponding preset frequency values or time, if then excise this load group, improve operating reliability.
Therein among embodiment, little electrical network control system that is incorporated into the power networks can comprise that also high frequency acquisition module and generating set disconnect module.
The high frequency acquisition module, be used for frequency values greater than second frequency value and performance number less than zero the time, after disconnecting module 170 and disconnecting points of common connection, obtain the frequency of big electrical network.
Generating set disconnects module and is used for determination frequency whether greater than the setpoint frequency value of generating set correspondence; And disconnect the tie point of generating set and big electrical network during greater than the setpoint frequency value of generating set correspondence in frequency.
Can with big electrical network wherein the part generator be divided into a plurality of generating sets, it can all be the generator of big electrical network in the generating set, as gas electricity generator, hydroelectricity generator, pneumoelectric generator etc., perhaps all be that other also are in little electrical network of the pattern of being incorporated into the power networks to the little electrical network group of disconnection module 170 excisions afterwards, generating set can also be both to have comprised generator, also comprises little electrical network of the pattern of being incorporated into the power networks.The corresponding setpoint frequency value of each generating set, each setpoint frequency value raise and gradually all greater than the second frequency value.Can divide into groups by the generator type, as the generator branch that can excise earlier in the minimum generating set of setpoint frequency.
For ease of understanding, each generating set can be numbered first generating set by its setpoint frequency value order from low to high with generating set at this, second generating set ....Because after disconnecting the little electrical network group of module 170 excisions, the frequency of big electrical network can change, and can obtain the frequency of big electrical network over time.At first with the setpoint frequency value of the frequency obtained and first generating set relatively, if the frequency of obtaining need not excised power supply less than the setpoint frequency value of first generating set; If the frequency of obtaining is greater than the setpoint frequency value of first generating set, then disconnect the tie point of first generating set and big electrical network, equally can be over time, again obtain the frequency of big electrical network, and the setpoint frequency value of the frequency that will obtain again and second generating set relatively, if the frequency of obtaining less than the setpoint frequency value of second generating set, illustrates disconnect as the excision requirement of having satisfied big electrical network behind first generating set, need not excise power supply; If the frequency of obtaining greater than the setpoint frequency value of second generating set, then disconnects the tie point of second generating set and big electrical network, and the like, until the excision requirement of satisfying big electrical network.The generator grouping is excised, can avoid excessive excision power supply.
If frequency values is greater than the setpoint frequency value of generating set correspondence relatively, also can be by time-delay acquisition module 150 and time-delay judge module 160, whether judgement frequency values in Preset Time surpasses predetermined value greater than the read-around ratio of the setpoint frequency value of generating set correspondence or time, if then excise this generating set, improve operating reliability.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. little electrical network control method that is incorporated into the power networks is characterized in that, may further comprise the steps:
Obtain frequency values and the performance number of the points of common connection of big electrical network and little electrical network;
Judging whether described frequency values and performance number satisfy disconnects requirement, described disconnection require for described frequency values less than default first frequency value, and described performance number is greater than zero; Or described frequency values is greater than default second frequency value, and described performance number is less than zero; Described first frequency value is less than described second frequency value;
If then disconnect described points of common connection.
2. little electrical network according to claim 1 control method that is incorporated into the power networks is characterized in that, if described frequency values and performance number satisfy described disconnection requirement, may further comprise the steps before the step of the described points of common connection of described disconnection:
Obtain the frequency slip frequency of described points of common connection;
Judge whether described frequency slip frequency surpasses default slippage threshold value;
If not, then carry out the step of the described points of common connection of described disconnection.
3. little electrical network according to claim 1 control method that is incorporated into the power networks is characterized in that, if described frequency values and performance number satisfy described disconnection requirement, may further comprise the steps before the step of the described points of common connection of described disconnection:
Obtain described frequency values satisfies described disconnection requirement in Preset Time read-around ratio or time;
Judge whether described read-around ratio or time surpass predetermined value;
If then carry out the step of the described points of common connection of described disconnection.
4. little electrical network according to claim 1 control method that is incorporated into the power networks is characterized in that, if described frequency values is less than described first frequency value, and described performance number may further comprise the steps after the step of the described points of common connection of described disconnection greater than zero:
Obtain the frequency of described big electrical network;
Judge that whether described frequency is less than load group corresponding preset frequency values; Described load group corresponding preset frequency values is less than described first frequency value;
If then disconnect the tie point of described load group and described big electrical network.
5. little electrical network according to claim 1 control method that is incorporated into the power networks is characterized in that, if described frequency values is greater than described second frequency value, and described performance number may further comprise the steps after the step of the described points of common connection of described disconnection less than zero:
Obtain the frequency of described big electrical network;
Judge that described frequency is whether greater than the setpoint frequency value of generating set correspondence; The setpoint frequency value of described generating set correspondence is greater than described second frequency value;
If then disconnect the tie point of described generating set and described big electrical network.
6. little electrical network control system that is incorporated into the power networks is characterized in that, comprising:
Acquisition module is for frequency values and the performance number of the points of common connection that obtains big electrical network and little electrical network;
Judge module is used for judging whether described frequency values and performance number satisfy disconnects requirement, described disconnection require for described frequency values less than default first frequency value, and described performance number is greater than zero; Or described frequency values is greater than default second frequency value, and described performance number is less than zero; Described first frequency value is less than described second frequency value;
Disconnect module, be used for satisfying in described frequency values and performance number and disconnect described points of common connection when described disconnection requires.
7. little electrical network according to claim 6 control system that is incorporated into the power networks is characterized in that, described little electrical network control system that is incorporated into the power networks comprises:
The slippage acquisition module is used for obtaining the frequency slip frequency of described points of common connection when described frequency values and performance number satisfy described disconnection and require;
The slippage judge module is used for judging whether described frequency slip frequency surpasses default slippage threshold value; And when described frequency slip frequency surpasses described slippage threshold value, control described disconnection module and disconnect described points of common connection.
8. little electrical network according to claim 6 control system that is incorporated into the power networks is characterized in that, described little electrical network control system that is incorporated into the power networks comprises:
The time-delay acquisition module is used for obtaining described frequency values satisfies described disconnection requirement in Preset Time read-around ratio or time when described frequency values and performance number satisfy described disconnection and require;
The time-delay judge module is used for judging whether described read-around ratio or time surpass predetermined value; And when described read-around ratio or time surpass described predetermined value, control described disconnection module and disconnect described points of common connection.
9. little electrical network according to claim 6 control system that is incorporated into the power networks is characterized in that, described little electrical network control system that is incorporated into the power networks comprises:
The low frequency acquisition module is used at described frequency values less than described first frequency value, and described performance number after described disconnection module disconnects described points of common connection, is obtained the frequency of described big electrical network greater than zero the time;
The load group disconnects module, is used for judging that whether described frequency is less than load group corresponding preset frequency values; And during less than described load group corresponding preset frequency values, disconnect the tie point of described load group and described big electrical network in described frequency; Described load group corresponding preset frequency values is less than described first frequency value.
10. little electrical network according to claim 6 control system that is incorporated into the power networks is characterized in that, described little electrical network control system that is incorporated into the power networks comprises:
The high frequency acquisition module is used at described frequency values greater than described second frequency value, and described performance number after described disconnection module disconnects described points of common connection, is obtained the frequency of described big electrical network less than zero the time;
Generating set disconnects module, is used for judging that described frequency is whether greater than the setpoint frequency value of generating set correspondence; And during greater than the setpoint frequency value of described generating set correspondence, disconnect the tie point of described generating set and described big electrical network in described frequency; The setpoint frequency value of described generating set correspondence is greater than described second frequency value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310140760.8A CN103208819B (en) | 2013-04-22 | 2013-04-22 | Micro-grid grid-connected operation control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310140760.8A CN103208819B (en) | 2013-04-22 | 2013-04-22 | Micro-grid grid-connected operation control method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103208819A true CN103208819A (en) | 2013-07-17 |
| CN103208819B CN103208819B (en) | 2015-05-27 |
Family
ID=48755946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310140760.8A Active CN103208819B (en) | 2013-04-22 | 2013-04-22 | Micro-grid grid-connected operation control method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103208819B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429619A (en) * | 2019-08-31 | 2019-11-08 | 上海交通大学 | A kind of disaster tolerance reaction method of the Demand-side frequency urgent control of ultra-large power grid |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110309690A1 (en) * | 2011-08-30 | 2011-12-22 | Renewable Power Conversion, Inc. | Centralized islanding protection for distributed renewable energy generators |
| CN102324741A (en) * | 2011-08-17 | 2012-01-18 | 国家电网公司 | Micro-power grid off-grid energy balance and control device and method |
| CN102841279A (en) * | 2012-08-31 | 2012-12-26 | 天津大学 | Micro-grid island detection method |
-
2013
- 2013-04-22 CN CN201310140760.8A patent/CN103208819B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324741A (en) * | 2011-08-17 | 2012-01-18 | 国家电网公司 | Micro-power grid off-grid energy balance and control device and method |
| US20110309690A1 (en) * | 2011-08-30 | 2011-12-22 | Renewable Power Conversion, Inc. | Centralized islanding protection for distributed renewable energy generators |
| CN102841279A (en) * | 2012-08-31 | 2012-12-26 | 天津大学 | Micro-grid island detection method |
Non-Patent Citations (1)
| Title |
|---|
| 陈卫民等: "基于分布式并网发电的新型孤岛检测研究", 《电工技术学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429619A (en) * | 2019-08-31 | 2019-11-08 | 上海交通大学 | A kind of disaster tolerance reaction method of the Demand-side frequency urgent control of ultra-large power grid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103208819B (en) | 2015-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108988305B (en) | Protection method of direct current power distribution network system | |
| CN102761123B (en) | Multi-infeed HVDC (high-voltage direct current) system partitioning method based on mounting of fault current limiters | |
| CN104362579A (en) | Method for increasing reclosing success rates of tie lines of clustered wind power plants | |
| CN103684162A (en) | Generator management system that determines a time to activate and deactivate generators based on the load level | |
| US10593497B2 (en) | Micro-grid adaptive relaying | |
| Tephiruk et al. | Modeling of rate of change of under frequency relay for microgrid protection | |
| CN104242455A (en) | 110 kV substation protection and control action cooperation strategy suitable for DG (distributed generation) accessing | |
| CN104242299B (en) | A kind of sub area division method considering the electric betweenness of circuit | |
| CN107271786A (en) | Island detection method based on harmonic impedance dq components | |
| CN107294128B (en) | Distributed power supply comprehensive anti-islanding protection system and method | |
| CN113972634A (en) | Micro-grid differential protection method for self-adaptive zero-sequence energy injection | |
| CN106019008A (en) | Island detection method based on voltage harmonic dq component | |
| CN108736493B (en) | Construction method, control system and control method of power system safety island | |
| CN103208819A (en) | Micro-grid grid-connected operation control method and system | |
| CN108418193B (en) | Fault power supply recovery method and system combining reclosing and low voltage ride through | |
| CN108599244A (en) | Power frequency change-based power grid island black start device and method | |
| CN104393602A (en) | Adjusting method and device for distributed energy resource network | |
| CN104882904A (en) | Novel photovoltaic power station passive anti-islanding protection method | |
| CN103490408A (en) | Collaborative modulation method based on power grid multi-circuit direct current | |
| CA3068230A1 (en) | Load switch for fragile electric power networks | |
| Swathika et al. | Communication assisted overcurrent protection of microgrid | |
| CN109802425B (en) | Method and device for fault ride-through of passive delivery system of flexible direct current power grid | |
| CN103235198A (en) | Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines | |
| Saffarian et al. | Performance investigation of new combinational load shedding schemes | |
| US10535993B2 (en) | Control system countermeasures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Applicant after: Company limited of China Energy Engineering Group Guangdong Electric Power Design Institute Address before: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Applicant before: Guangdong Electric Power Design Institute of CEEC |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE TO: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE CO., LTD. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |