CN103208819B - Micro-grid grid-connected operation control method and system - Google Patents
Micro-grid grid-connected operation control method and system Download PDFInfo
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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 electric power network technique field, particularly relate to a kind of micro-grid connection progress control method and system.
Background technology
Micro-capacitance sensor is made up of distributed power source, load and electrical power trans mission/distribution system, can independent operating or be incorporated into the power networks with bulk power grid, has a micro electric Force system to internal electric source and Coordinated optimal control function.Micro-grid connection refers to micro-capacitance sensor and the put into parallel operation with large power network of being powered by large-sized unit, and namely pass through on major loop with regular distribution net to be electrically connected, tie point is commonly referred to as PCC(point of common coupling, points of common connection).
When single micro-capacitance sensor is incorporated to bulk power grid, because micro-capacitance sensor is small, bulk power grid does not generally consider the spinning reserve of micro-capacitance sensor.When the permeability of micro-capacitance sensor is higher, after namely having a large amount of micro-capacitance sensor to be incorporated to bulk power grid, when electric power system is disturbed, micro-capacitance sensor can increase the weight of fault severity level, reduces the fail safe of bulk power grid.
Summary of the invention
Based on this, when being necessary to provide a kind of a large amount of micro-capacitance sensor to be incorporated to bulk power grid, ensure micro-grid connection progress control method and the system of bulk power grid fail safe.
A kind of micro-grid connection progress control method, comprises the following steps:
Obtain frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor;
Judge whether described frequency values and performance number meet and disconnect requirement, described disconnection requires to be less than default first frequency value for described frequency values, 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 so, described points of common connection is then disconnected.
Wherein in an embodiment, if described frequency values and performance number meet described disconnection requirement, comprise the following 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 exceedes default slippage threshold value;
If not, then the step of the described points of common connection of described disconnection is carried out.
Wherein in an embodiment, if described frequency values and performance number meet described disconnection requirement, comprise the following steps before the step of the described points of common connection of described disconnection:
Obtain described frequency values in Preset Time and meet the described read-around ratio or the time that disconnect requirement;
Judge whether described read-around ratio or time exceed predetermined value;
If so, the step of the described points of common connection of described disconnection is then carried out.
Wherein in an embodiment, if described frequency values is less than described first frequency value, and described performance number is greater than zero, comprises the following steps after the step of the described points of common connection of described disconnection:
Obtain the frequency of described bulk power grid;
Judge whether described frequency is less than predeterminated frequency value corresponding to load group; Predeterminated frequency value corresponding to described load group is less than described first frequency value;
If so, the tie point of described load group and described bulk power grid is then disconnected.
Wherein in an embodiment, if described frequency values is greater than described second frequency value, and described performance number is less than zero, comprises the following steps after the step of the described points of common connection of described disconnection:
Obtain the frequency of described bulk power grid;
Judge whether described frequency is greater than setpoint frequency value corresponding to generating set; The setpoint frequency value that described generating set is corresponding is greater than described second frequency value;
If so, the tie point of described generating set and described bulk power grid is then disconnected.
A kind of micro-grid connection operation control system, comprising:
Acquisition module, for obtaining frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor;
Judge module, disconnect requirement for judging whether described frequency values and performance number meet, described disconnection requires to be less than default first frequency value for described frequency values, 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;
Disconnecting module, disconnecting described points of common connection for meeting when described disconnection requires at described frequency values and performance number.
Wherein in an embodiment, described micro-grid connection operation control system comprises:
Slippage acquisition module, for meet at described frequency values and performance number described disconnection require time, obtain the frequency slip frequency of described points of common connection;
Slippage judge module, for judging whether described frequency slip frequency exceedes default slippage threshold value; And control described disconnection module when described frequency slip frequency does not exceed described slippage threshold value and disconnect described points of common connection.
Wherein in an embodiment, described micro-grid connection operation control system comprises:
Time delay acquisition module, for meet at described frequency values and performance number described disconnection require time, obtain described frequency values in Preset Time meet described disconnect require read-around ratio or the time;
Delay judgement module, for judging whether described read-around ratio or time exceed predetermined value; And control described disconnection module when described read-around ratio or time exceed described predetermined value and disconnect described points of common connection.
Wherein in an embodiment, described micro-grid connection operation control system comprises:
Low frequency acquisition module, for being less than described first frequency value at described frequency values, and when described performance number is greater than zero, after described disconnection module disconnects described points of common connection, obtains the frequency of described bulk power grid;
Load group disconnects module, for judging whether described frequency is less than predeterminated frequency value corresponding to load group; And the tie point of described load group and described bulk power grid is disconnected when described frequency is less than predeterminated frequency value corresponding to described load group; Predeterminated frequency value corresponding to described load group is less than described first frequency value.
Wherein in an embodiment, described micro-grid connection operation control system comprises:
High frequency acquisition module, for being greater than described second frequency value at described frequency values, and when described performance number is less than zero, after described disconnection module disconnects described points of common connection, obtains the frequency of described bulk power grid;
Generating set disconnects module, for judging whether described frequency is greater than setpoint frequency value corresponding to generating set; And the tie point of described generating set and described bulk power grid is disconnected when described frequency is greater than setpoint frequency value corresponding to described generating set; The setpoint frequency value that described generating set is corresponding is greater than described second frequency value.
Above-mentioned micro-grid connection progress control method and system, when there being a large amount of micro-capacitance sensor to be incorporated to bulk power grid, acquisition module obtains frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor; Whether judge module determination frequency value and performance number meet disconnects requirement, and namely frequency values is 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; Disconnect module and meet disconnection points of common connection when disconnection requires at frequency values and performance number.When bulk power grid generation disturbance, by excision micro-capacitance sensor, eliminating micro-capacitance sensor affect the frequency fluctuation of bulk power grid, can quick-recovery bulk power grid frequency soon, the fail safe of raising bulk power grid.
Accompanying drawing explanation
Fig. 1 is the flow chart of micro-grid connection progress control method in an embodiment;
Fig. 2 is the flow chart of micro-grid connection progress control method in another embodiment;
Fig. 3 is the structure chart of micro-grid connection operation control system in an embodiment;
Fig. 4 is the structure chart of micro-grid connection operation control system in another embodiment.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
The invention provides a kind of micro-grid connection progress control method, as shown in Figure 1, comprise the following steps:
Step S110: the frequency values and the performance number that obtain the points of common connection of bulk power grid and micro-capacitance sensor.
Micro-capacitance sensor is connected with bulk power grid by points of common connection, and multiple micro-capacitance sensor can form a larger micro-capacitance sensor and connect bulk power grid by points of common connection, also can connect bulk power grid each via different points of common connection.Detect frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor, the state of bulk power grid and micro-capacitance sensor can be learnt, detect that performance number is greater than zero as worked as, namely points of common connection power flows to micro-capacitance sensor by bulk power grid, and now micro-capacitance sensor is in load condition for bulk power grid; If detection power value is less than zero, namely points of common connection power flows to bulk power grid by micro-capacitance sensor, and now micro-capacitance sensor is in power supply status for bulk power grid.Can be regard all micro-capacitance sensor being incorporated to bulk power grid as a micro-capacitance sensor group in the present embodiment, also can be to be incorporated to the part micro-capacitance sensor of bulk power grid as micro-capacitance sensor group, judges whether to need excision micro-capacitance sensor group by subsequent step.
Step S120: whether determination frequency value and performance number meet disconnects requirement.
The present embodiment breaks and requires to be less than default first frequency value and performance number is greater than zero for frequency values; Or frequency values is greater than default second frequency value and performance number is less than zero.Wherein first frequency value is less than second frequency value, and all can adjust according to actual conditions.If frequency values and performance number meet disconnect requirement, then carry out step S170; If do not meet, then do not carry out step S170, micro-capacitance sensor can large-scale grid connection, allows to be powered by bulk power grid, to improve the power supply reliability of micro-capacitance sensor; And allow micro-capacitance sensor to power to bulk power grid, to improve the utilance of generation of electricity by new energy.
Step S170: disconnect points of common connection.
When bulk power grid the frequency values of points of common connection and performance number meet disconnection require time, disconnect the points of common connection of micro-capacitance sensor in micro-capacitance sensor group and bulk power grid, micro-capacitance sensor group excised from bulk power grid, the micro-capacitance sensor in micro-capacitance sensor group proceeds to isolated power grid pattern.
Above-mentioned micro-grid connection progress control method, when there being a large amount of micro-capacitance sensor to be incorporated to bulk power grid, first obtains frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor.Then whether determination frequency value and performance number meet and disconnect requirement, and namely frequency values is 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.Require if frequency values and performance number meet to disconnect, disconnect points of common connection.When bulk power grid generation disturbance, by preferentially excising micro-capacitance sensor, eliminating micro-capacitance sensor affect the frequency fluctuation of bulk power grid, can quick-recovery bulk power grid frequency soon, the fail safe of raising bulk power grid.
Above-mentioned micro-grid connection progress control method, utilize the feature that micro-capacitance sensor can be changed between grid-connected and lonely net two kinds of patterns, when bulk power grid generation disturbance causes frequency change, first micro-capacitance sensor is excised, ensure the fail safe of the bulk power grid under micro-capacitance sensor high permeability.Avoid other loads first excising bulk power grid, avoid the load loss of bulk power grid as far as possible.After disconnection points of common connection, micro-capacitance sensor enters isolated power grid pattern, and its inside still can ensure the power supply of responsible consumer, has ensured the power supply reliability to important load.If frequency values and performance number do not meet disconnect requirement, then can not disconnect points of common connection, ensure the grid-connected of micro-capacitance sensor clean energy resource, for bulk power system provides clean energy resource supply.
After disconnection points of common connection, by adjustment, the micro-capacitance sensor internal frequency proceeding to isolated power grid pattern is tended towards stability, after the frequency of bulk power grid and micro-capacitance sensor is all stable, the step connecting points of common connection can also be comprised, make micro-capacitance sensor again enter the pattern of being incorporated into the power networks.
Wherein in an embodiment, as shown in Figure 2, if frequency values and performance number meet disconnect requirement, can comprise the following steps before step S170:
Step S130: the frequency slip frequency obtaining points of common connection.
Specifically comprise two kinds of situations: when frequency values is less than first frequency value, and when performance number is greater than zero, obtain the frequency decrease slippage of points of common connection, the first slippery difference can be designated as at this; When frequency values is greater than second frequency value, and when performance number is less than zero, obtain the frequency rising slippage of points of common connection, the second slippery difference can be designated as at this.
Step S140: whether determination frequency slippage exceedes default slippage threshold value.
If frequency slip frequency does not exceed slippage threshold value, then carry out step S170.If frequency slip frequency exceedes slippage threshold value, then do not carry out step S170.
Corresponding with step S130, step S140 also can comprise two kinds of situations: when frequency values is less than first frequency value, and when performance number is greater than zero, judges whether the first slippery difference presets slippage threshold value more than first; When frequency values is greater than second frequency value, and when performance number is less than zero, judge whether the second slippery difference presets slippage threshold value more than second.Be appreciated that first preset slippage threshold value and second preset slippage threshold value size can identical also can be different, and can to adjust according to actual conditions.
Described step S130 and step S140 is provided with frequency slip frequency locking, by step S130 and step S140, avoid bulk power grid transient fault, as the malfunction that short trouble, generating set tripping operation, load switching equifrequent abnormal conditions may cause, improve operating reliability.
Continue with reference to Fig. 2, wherein in an embodiment, if frequency values and performance number meet disconnect requirement, also can comprise the following steps before step S170:
Step S150: obtain frequency values in Preset Time and meet the read-around ratio or time that disconnect and requiring.
Same step S150 can comprise two kinds of situations: if frequency values is less than first frequency value and performance number is greater than zero, then in the first Preset Time, detect read-around ratio or time that frequency values is less than first frequency value, can be designated as the first read-around ratio or time at this; If frequency values is greater than second frequency value and performance number is less than zero, then in the second Preset Time, detect read-around ratio or time that frequency values is greater than second frequency value, the second read-around ratio or time can be designated as at this.First Preset Time and the second Preset Time can identical also can be different, and can to adjust according to actual conditions.
Step S160: judge whether read-around ratio or time exceed predetermined value.
If read-around ratio or time exceed predetermined value, then carry out step S170.If read-around ratio or time do not exceed predetermined value, then do not carry out step S170.
Corresponding with step S150, step S160 also can comprise two kinds of situations: when frequency values is less than first frequency value, and when performance number is greater than zero, then judge that whether the first read-around ratio or time are more than the first predetermined value; When frequency values is greater than second frequency value, and when performance number is less than zero, then judge that whether the second read-around ratio or time are more than the second predetermined value.Be appreciated that the first predetermined value and the second predetermined value can identical also can be different, and can to adjust according to actual conditions.
By step S150 and step S160, after frequency values and performance number meet disconnection requirement, judge whether frequency values meets the read-around ratio or time that disconnect and requiring in Preset Time, exceed predetermined value.If then carry out step S170, the malfunction caused due to bulk power grid transient fault can be avoided equally, improve operating reliability.
Be appreciated that wherein in an embodiment, micro-grid connection progress control method also can comprise step S130, step S140, step S150 and step S160, can avoid malfunction further simultaneously, improve operating reliability.Can be carry out step S150 and step S160 after step S140 determination frequency slippage does not exceed slippage threshold value, also can be carry out step S130 and step S140 after step S160 judges read-around ratio or the time exceedes predetermined value.
In addition, wherein in an embodiment, if frequency values is less than first frequency value, and performance number is greater than zero, can comprise the following steps after step S170:
Obtain the frequency of bulk power grid.
Whether determination frequency is less than predeterminated frequency value corresponding to load group.
If so, the tie point of load group and bulk power grid is then disconnected.
Its intermediate of bulk power grid can be divided into multiple load group, load in load group can be all the electricity consumption object of bulk power grid, or other are also in the micro-capacitance sensor of grid-connect mode after being all step S170, load group can also be both comprised electricity consumption object, also comprises the micro-capacitance sensor of grid-connect mode.The corresponding predeterminated frequency value of each load group, each predeterminated frequency value reduces gradually and is all less than first frequency value.Can divide into groups by load significance level, as divided by most important load in the minimum load group of predeterminated frequency value, the load that can preferentially excise divides in the load group that predeterminated frequency is the highest.
For ease of understanding, can be the first load group by its predeterminated frequency value order from high to low by load group # by each load group at this, the second load group ....Owing to excising after micro-capacitance sensor group through step S170, the frequency of bulk power grid can change, and over time, can obtain the frequency of bulk power grid.First the predeterminated frequency value of the frequency of acquisition with the first load group is compared, if the frequency obtained is greater than the predeterminated frequency value of the first load group, do not need to excise load; If the frequency obtained is less than the predeterminated frequency value of the first load group, then disconnect the tie point of the first load group and bulk power grid, equally can be over time, again the frequency of bulk power grid is obtained, and the predeterminated frequency value of the frequency again obtained with the second load group is compared, if the frequency obtained is greater than the predeterminated frequency value of the second load group, then meets the excision requirement of bulk power grid after disconnection first load group is described, do not needed to excise load again; If the frequency obtained is less than the predeterminated frequency value of the second load group, then disconnect the tie point of the second load group and bulk power grid, the like, until meet the excision requirement of bulk power grid.Load grouping is excised, excessive excision load can be avoided.
If frequency values is less than predeterminated frequency value corresponding to load group relatively, also the operation of similar step S150 and step S160 can be carried out, judge that in Preset Time frequency values is less than the read-around ratio of predeterminated frequency value corresponding to load group or whether the time exceedes predetermined value, if then excise this load group, improve operating reliability.
If the frequency values obtained is greater than second frequency value, and performance number is less than zero, also can comprise the following steps after step S170:
Obtain the frequency of bulk power grid.
Whether determination frequency is greater than setpoint frequency value corresponding to generating set.
If so, the tie point of generating set and bulk power grid is then disconnected.
Can by bulk power grid wherein part generate electricity machine be divided into multiple generating set, it can be all the generator of bulk power grid in generating set, as gas electricity generator, hydroelectricity generator, pneumoelectric generator etc., or other are also in the micro-capacitance sensor of grid-connect mode after being all step S170, generating set can also be both comprised generator, also comprises the micro-capacitance sensor of grid-connect mode.The corresponding setpoint frequency value of each generating set, each setpoint frequency value raises gradually and is all greater than second frequency value.Can divide into groups by generator type, the generator as can be first excised divides in the minimum generating set of setpoint frequency.
For ease of understanding, generating set can be numbered the first generating set, the second generating set by its setpoint frequency value order from low to high by each generating set at this ....Owing to excising after micro-capacitance sensor group through step S170, the frequency of bulk power grid can change, and over time, can obtain the frequency of bulk power grid.First the frequency of acquisition is compared with the setpoint frequency value of the first generating set, if the frequency obtained is less than the setpoint frequency value of the first generating set, do not need to excise power supply; If the frequency obtained is greater than the setpoint frequency value of the first generating set, then disconnect the tie point of the first generating set and bulk power grid, equally can be over time, again the frequency of bulk power grid is obtained, and the frequency again obtained is compared with the setpoint frequency value of the second generating set, if the frequency obtained is less than the setpoint frequency value of the second generating set, then meets the excision requirement of bulk power grid after disconnection first generating set being described, do not needed to excise power supply again; If the frequency obtained is greater than the setpoint frequency value of the second generating set, then disconnect the tie point of the second generating set and bulk power grid, the like, until meet the excision requirement of bulk power grid.Generator grouping is excised, excessive excision power supply can be avoided.
If frequency values is greater than setpoint frequency value corresponding to generating set relatively, also the operation of similar step S150 and step S160 can be carried out, judge that in Preset Time frequency values is greater than the read-around ratio of setpoint frequency value corresponding to generating set or whether the time exceedes predetermined value, if then excise this generating set, improve operating reliability.
In addition, present invention also offers a kind of micro-grid connection operation control system, as shown in Figure 3, comprise acquisition module 110, judge module 120 and disconnect module 170.
Acquisition module 110 is for obtaining frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor.
Micro-capacitance sensor is connected with bulk power grid by points of common connection, and multiple micro-capacitance sensor can form a larger micro-capacitance sensor and connect bulk power grid by points of common connection, also can connect bulk power grid each via different points of common connection.Detect frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor, the state of bulk power grid and micro-capacitance sensor can be learnt, detect that performance number is greater than zero as worked as, namely points of common connection power flows to micro-capacitance sensor by bulk power grid, and now micro-capacitance sensor is in load condition for bulk power grid; If detect, performance number is less than zero, and namely points of common connection power flows to bulk power grid by micro-capacitance sensor, and now micro-capacitance sensor is in power supply status for bulk power grid.Can be regard all micro-capacitance sensor being incorporated to bulk power grid as a micro-capacitance sensor group in the present embodiment, also can be to be incorporated to the part micro-capacitance sensor of bulk power grid as micro-capacitance sensor group, judges whether to need excision micro-capacitance sensor group by subsequent step.
Whether judge module 120 meets for determination frequency value and performance number disconnects requirement.
The present embodiment breaks and requires to be less than default first frequency value for frequency values, and performance number is greater than zero; Or frequency values is greater than default second frequency value, and performance number is less than zero.First frequency value is less than second frequency value, and all can adjust according to actual conditions.
Disconnect module 170 and disconnect points of common connection for meeting at frequency values and performance number when disconnection requires.
If frequency values and performance number meet disconnect requirement, then disconnect the points of common connection that module 170 disconnects micro-capacitance sensor in micro-capacitance sensor group and bulk power grid, micro-capacitance sensor group excised from bulk power grid, the micro-capacitance sensor in micro-capacitance sensor group proceeds to isolated power grid pattern.If do not meet, then disconnect module 170 and do not carry out opening operation, micro-capacitance sensor can large-scale grid connection, allows to be powered by bulk power grid, to improve the power supply reliability of micro-capacitance sensor; And allow micro-capacitance sensor to power to bulk power grid, to improve the utilance of generation of electricity by new energy.
Above-mentioned micro-grid connection operation control system, when there being a large amount of micro-capacitance sensor to be incorporated to bulk power grid, acquisition module 110 obtains frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor; Judge whether mould 120 pieces of determination frequency values and performance number meet and disconnect requirement, namely frequency values is 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; Disconnect module 170 and meet disconnection points of common connection when disconnection requires at frequency values and performance number.When bulk power grid generation disturbance, by excision micro-capacitance sensor, eliminating micro-capacitance sensor affect the frequency fluctuation of bulk power grid, can quick-recovery bulk power grid frequency soon, the fail safe of raising bulk power grid.
Above-mentioned micro-grid connection operation control system, utilize the feature that micro-capacitance sensor can be changed between grid-connected and lonely net two kinds of patterns, when bulk power grid generation disturbance causes frequency change, first micro-capacitance sensor is excised, ensure the fail safe of the bulk power grid under micro-capacitance sensor high permeability.Avoid the load first excising bulk power grid, avoid the load loss of bulk power grid as far as possible.After disconnection points of common connection, micro-capacitance sensor enters isolated power grid pattern, and its inside still can ensure the power supply of responsible consumer, has ensured the power supply reliability to important load.If frequency values and performance number do not meet disconnect requirement, then can not disconnect points of common connection, ensure the grid-connected of micro-capacitance sensor clean energy resource, for bulk power system provides clean energy resource supply.
Micro-grid connection operation control system also can comprise adjusting module and link block, adjusting module is after disconnection module 170 disconnects points of common connection, micro-capacitance sensor internal frequency after proceeding to isolated power grid pattern is tended towards stability, link block is after the frequency of bulk power grid and micro-capacitance sensor is all stable, connect points of common connection, micro-capacitance sensor is made again to enter the pattern of being incorporated into the power networks, in other embodiments also by manually connecting points of common connection.
Wherein in an embodiment, as shown in Figure 4, micro-grid connection operation control system can comprise slippage acquisition module 130 and slippage judge module 140.
When slippage acquisition module 130 requires for meeting disconnection at frequency values and performance number, obtain the frequency slip frequency of points of common connection.
Specifically comprise two kinds of situations: when frequency values is less than first frequency value, and when performance number is greater than zero, obtain the frequency decrease slippage of points of common connection, the first slippery difference can be designated as at this; When frequency values is greater than second frequency value, and when performance number is less than zero, obtain the frequency rising slippage of points of common connection, the second slippery difference can be designated as at this.
Whether slippage judge module 140 exceedes default slippage threshold value for determination frequency slippage; And control disconnection module 170 disconnects points of common connection when frequency slip frequency does not exceed slippage threshold value.
Accordingly, also can comprise two kinds of situations: when frequency values is less than first frequency value, and when performance number is greater than zero, judge whether the first slippery difference presets slippage threshold value more than first; When frequency values is greater than second frequency value, and when performance number is less than zero, judge whether the second slippery difference presets slippage threshold value more than second.Be appreciated that first preset slippage threshold value and second preset slippage threshold value size can identical also can be different, and can to adjust according to actual conditions.
Namely the effect of slippage acquisition module 130 and slippage judge module 140 is be provided with frequency slip frequency locking, avoid bulk power grid transient fault, as the malfunction that short trouble, generating set tripping operation, load switching equifrequent abnormal conditions may cause, improve operating reliability.
Continue with reference to Fig. 4, wherein in an embodiment, micro-grid connection operation control system also can comprise time delay acquisition module 150 and delay judgement module 160.
When time delay acquisition module 150 requires for meeting disconnection at frequency values and performance number, obtain frequency values in Preset Time and meet the read-around ratio or time that disconnect and requiring.
Comprise two kinds of situations equally: if frequency values is less than first frequency value and performance number is greater than zero, then in the first Preset Time, detect read-around ratio or time that frequency values is less than first frequency value, the first read-around ratio or time can be designated as at this; If frequency values is greater than second frequency value and performance number is less than zero, then in the second Preset Time, detect read-around ratio or time that frequency values is greater than second frequency value, the second read-around ratio or time can be designated as at this.First Preset Time and the second Preset Time can identical also can be different, and can to adjust according to actual conditions.
Delay judgement module 160 is for judging whether read-around ratio or time exceed predetermined value; And control disconnection module 170 disconnects points of common connection when read-around ratio or time exceed predetermined value.
Accordingly, also can comprise two kinds of situations: when frequency values is less than first frequency value, and when performance number is greater than zero, then judge that whether the first read-around ratio or time are more than the first predetermined value; When frequency values is greater than second frequency value, and when performance number is less than zero, then judge that whether the second read-around ratio or time are more than the second predetermined value.Be appreciated that the first predetermined value and the second predetermined value can identical also can be different, and can to adjust according to actual conditions.
By time delay acquisition module 150 and delay judgement module 160, after frequency values and performance number meet disconnection requirement, judge whether frequency values meets the read-around ratio or time that disconnect and requiring in Preset Time, exceed predetermined value.If then control to disconnect module 170 to disconnect points of common connection, the malfunction caused due to bulk power grid transient fault can be avoided equally, improve operating reliability.
Be appreciated that, wherein in an embodiment, micro-grid connection operation control system also can comprise slippage acquisition module 130, slippage judge module 140, time delay acquisition module 150 and delay judgement module 160 simultaneously, can avoid malfunction further, improves operating reliability.Can be after slippage judge module 140 determination frequency slippage does not exceed slippage threshold value, time delay acquisition module 150 obtains frequency values in Preset Time and meets the read-around ratio or time that disconnect and requiring, also can be that slippage acquisition module 130 obtains the frequency slip frequency of points of common connection after delay judgement module 160 judges read-around ratio or the time exceedes predetermined value.
In addition, wherein in an embodiment, micro-grid connection operation control system can comprise low frequency acquisition module and load group disconnects module.
Low frequency acquisition module, for be less than first frequency value at frequency values and performance number is greater than zero time, disconnect after module 170 disconnects points of common connection, obtain the frequency of bulk power grid.
Load group disconnects module and whether is less than predeterminated frequency value corresponding to load group for determination frequency; And the tie point of load group and bulk power grid is disconnected when frequency is less than predeterminated frequency value corresponding to load group.
Its intermediate of bulk power grid can be divided into multiple load group, load in load group can be all the electricity consumption object of bulk power grid, or be all the micro-capacitance sensor that after disconnection module 170 excises micro-capacitance sensor group, other are also in grid-connect mode, load group can also be both comprised electricity consumption object, also comprises the micro-capacitance sensor of grid-connect mode.The corresponding predeterminated frequency value of each load group, each predeterminated frequency value reduces gradually and is all less than first frequency value.Can divide into groups by load significance level, as divided by most important load in the minimum load group of predeterminated frequency value, the load that can preferentially excise divides in the load group that predeterminated frequency is the highest.
For ease of understanding, can be the first load group by its predeterminated frequency value order from high to low by load group # by each load group at this, the second load group ....Due to after disconnecting module 170 and excising micro-capacitance sensor group, the frequency of bulk power grid can change, and over time, can obtain the frequency of bulk power grid.First the predeterminated frequency value of the frequency of acquisition with the first load group is compared, if the frequency obtained is greater than the predeterminated frequency value of the first load group, do not need to excise load; If the frequency obtained is less than the predeterminated frequency value of the first load group, then disconnect the tie point of the first load group and bulk power grid, equally can be over time, again the frequency of bulk power grid is obtained, and the predeterminated frequency value of the frequency again obtained with the second load group is compared, if the frequency obtained is greater than the predeterminated frequency value of the second load group, meets the excision requirement of bulk power grid after disconnection first load group is described, do not needed to excise load again; If the frequency obtained is less than the predeterminated frequency value of the second load group, then disconnect the tie point of the second load group and bulk power grid, the like, until meet the excision requirement of bulk power grid.Load grouping is excised, excessive excision load can be avoided.
If frequency values is less than predeterminated frequency value corresponding to load group relatively, also by time delay acquisition module 150 and delay judgement module 160, judge that in Preset Time frequency values is less than the read-around ratio of predeterminated frequency value corresponding to load group or whether the time exceedes predetermined value, if then excise this load group, improve operating reliability.
Wherein in an embodiment, micro-grid connection operation control system also can comprise high frequency acquisition module and generating set disconnects module.
High frequency acquisition module, for be greater than second frequency value at frequency values and performance number is less than zero time, disconnect after module 170 disconnects points of common connection, obtain the frequency of bulk power grid.
Generating set disconnects module and whether is greater than setpoint frequency value corresponding to generating set for determination frequency; And the tie point of generating set and bulk power grid is disconnected when frequency is greater than setpoint frequency value corresponding to generating set.
Can by bulk power grid wherein part generate electricity machine be divided into multiple generating set, it can be all the generator of bulk power grid in generating set, as gas electricity generator, hydroelectricity generator, pneumoelectric generator etc., or be all the micro-capacitance sensor that after disconnection module 170 excises micro-capacitance sensor group, other are also in grid-connect mode, generating set can also be both comprised generator, also comprises the micro-capacitance sensor of grid-connect mode.The corresponding setpoint frequency value of each generating set, each setpoint frequency value raises gradually and is all greater than second frequency value.Can divide into groups by generator type, the generator as can be first excised divides in the minimum generating set of setpoint frequency.
For ease of understanding, generating set can be numbered the first generating set, the second generating set by its setpoint frequency value order from low to high by each generating set at this ....Due to after disconnecting module 170 and excising micro-capacitance sensor group, the frequency of bulk power grid can change, and over time, can obtain the frequency of bulk power grid.First the frequency of acquisition is compared with the setpoint frequency value of the first generating set, if the frequency obtained is less than the setpoint frequency value of the first generating set, do not need to excise power supply; If the frequency obtained is greater than the setpoint frequency value of the first generating set, then disconnect the tie point of the first generating set and bulk power grid, equally can be over time, again the frequency of bulk power grid is obtained, and the frequency again obtained is compared with the setpoint frequency value of the second generating set, if the frequency obtained is less than the setpoint frequency value of the second generating set, illustrates and disconnect as the excision requirement having met bulk power grid after the first generating set, do not need to excise power supply; If the frequency obtained is greater than the setpoint frequency value of the second generating set, then disconnect the tie point of the second generating set and bulk power grid, the like, until meet the excision requirement of bulk power grid.Generator grouping is excised, excessive excision power supply can be avoided.
If frequency values is greater than setpoint frequency value corresponding to generating set relatively, also by time delay acquisition module 150 and delay judgement module 160, judge that in Preset Time frequency values is greater than the read-around ratio of setpoint frequency value corresponding to generating set or whether the time exceedes predetermined value, if then excise this generating set, improve operating reliability.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It 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 (8)
1. a micro-grid connection progress control method, is characterized in that, comprises the following steps:
Obtain frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor;
Judge whether described frequency values and performance number meet and disconnect requirement, described disconnection requires to be less than default first frequency value for described frequency values, 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 so, then obtain described frequency values in Preset Time and meet the described read-around ratio or the time that disconnect requirement, judge whether described read-around ratio or time exceed predetermined value, if so, then disconnect described points of common connection.
2. micro-grid connection progress control method according to claim 1, is characterized in that, if described frequency values and performance number meet described disconnection requirement, comprises the following 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 exceedes default slippage threshold value;
If not, then the step of the described points of common connection of described disconnection is carried out.
3. micro-grid connection progress control method according to claim 1, is characterized in that, if described frequency values is less than described first frequency value, and described performance number is greater than zero, comprises the following steps after the step of the described points of common connection of described disconnection:
Obtain the frequency of described bulk power grid;
Judge whether described frequency is less than predeterminated frequency value corresponding to load group; Predeterminated frequency value corresponding to described load group is less than described first frequency value;
If so, the tie point of described load group and described bulk power grid is then disconnected.
4. micro-grid connection progress control method according to claim 1, is characterized in that, if described frequency values is greater than described second frequency value, and described performance number is less than zero, comprises the following steps after the step of the described points of common connection of described disconnection:
Obtain the frequency of described bulk power grid;
Judge whether described frequency is greater than setpoint frequency value corresponding to generating set; The setpoint frequency value that described generating set is corresponding is greater than described second frequency value;
If so, the tie point of described generating set and described bulk power grid is then disconnected.
5. a micro-grid connection operation control system, is characterized in that, comprising:
Acquisition module, for obtaining frequency values and the performance number of the points of common connection of bulk power grid and micro-capacitance sensor;
Judge module, disconnect requirement for judging whether described frequency values and performance number meet, described disconnection requires to be less than default first frequency value for described frequency values, 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;
Time delay acquisition module, for meet at described frequency values and performance number described disconnection require time, obtain described frequency values in Preset Time meet described disconnect require read-around ratio or the time;
Delay judgement module, for judging whether described read-around ratio or time exceed predetermined value;
Disconnect module, for disconnecting described points of common connection when described read-around ratio or time exceed described predetermined value.
6. micro-grid connection operation control system according to claim 5, is characterized in that, described micro-grid connection operation control system comprises:
Slippage acquisition module, for meet at described frequency values and performance number described disconnection require time, obtain the frequency slip frequency of described points of common connection;
Slippage judge module, for judging whether described frequency slip frequency exceedes default slippage threshold value; And control described disconnection module when described frequency slip frequency does not exceed described slippage threshold value and disconnect described points of common connection.
7. micro-grid connection operation control system according to claim 5, is characterized in that, described micro-grid connection operation control system comprises:
Low frequency acquisition module, for being less than described first frequency value at described frequency values, and when described performance number is greater than zero, after described disconnection module disconnects described points of common connection, obtains the frequency of described bulk power grid;
Load group disconnects module, for judging whether described frequency is less than predeterminated frequency value corresponding to load group; And when described frequency is less than predeterminated frequency value corresponding to described load group, disconnect the tie point of described load group and described bulk power grid; Predeterminated frequency value corresponding to described load group is less than described first frequency value.
8. micro-grid connection operation control system according to claim 5, is characterized in that, described micro-grid connection operation control system comprises:
High frequency acquisition module, for being greater than described second frequency value at described frequency values, and when described performance number is less than zero, after described disconnection module disconnects described points of common connection, obtains the frequency of described bulk power grid;
Generating set disconnects module, for judging whether described frequency is greater than setpoint frequency value corresponding to generating set; And when described frequency is greater than setpoint frequency value corresponding to described generating set, disconnect the tie point of described generating set and described bulk power grid; The setpoint frequency value that described generating set is corresponding is greater than described second frequency value.
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| CN102841279A (en) * | 2012-08-31 | 2012-12-26 | 天津大学 | Micro-grid island detection method |
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