CN105098770A - Power supply recovery control method and apparatus - Google Patents
Power supply recovery control method and apparatus Download PDFInfo
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- CN105098770A CN105098770A CN201510460294.0A CN201510460294A CN105098770A CN 105098770 A CN105098770 A CN 105098770A CN 201510460294 A CN201510460294 A CN 201510460294A CN 105098770 A CN105098770 A CN 105098770A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The embodiments of the invention disclose a power supply recovery control method and apparatus. When a line fault is detected, reclosing control operation is executed according to preset reclosing time so as to obtain an operation result; isolated network detection is carried out on a junctor between a local power network and a main network so as to obtain a detection result; and when the operation result is that reclosing control fails and the detection result indicates a local isolated network, system power supply is recovered through a mode of closing a stand-by power supply.
Description
Technical Field
The invention relates to the field of power control, in particular to a power supply recovery control method and device.
Background
With continuous development and utilization of hydropower resources and continuous access of new energy sources such as wind power generation, solar power generation and the like, local power supplies are connected in a plurality of regional power grids. When a power grid fails to work, a power grid in a certain area is disconnected with a main grid to form a local isolated grid, and the isolated grid is required to be connected with the main grid as soon as possible due to the fact that the self adjusting capacity and the fault impact resistance of the isolated grid are weak. However, due to the influence of the local power supply, the probability of successful reclosure after the line fault is low, and the reasons are as follows:
pressure detection is not carried out: if the power receiving proportion of a local power grid is large, stable operation cannot be maintained after a local isolated grid is formed, but the isolated grid can still operate for a long time, the voltage detection condition is not met, the isolated grid can be superposed after the local isolated grid is dragged down, and the voltage detection and closing are unsuccessful due to the fact that the residual voltage disappearance time is long and possibly exceeds the whole set time of the device;
and (3) synchronization detection: if the difference between the power generation power of the local isolated network and the load is large after the fault, the frequency difference between the isolated network and the main network can reach a large value in a short time, if the frequency difference between the local isolated network and the main network is stable in a certain range after the fault, the frequency of the isolated network and the frequency of the main network can periodically appear in a period of synchronization, but the conventional reclosing delay is long and is often larger than the period of synchronization, so that the synchronization detection failure is caused.
In addition, the reclosing delay fixed value of synchronous closing in the traditional protection comprises two parts of dissociating time and synchronous detecting time, and because dissociating time is about one second generally, the isolated network and the main network are difficult to ensure to meet synchronous detecting conditions in the long time. Because the local power supply output of the regional power grid fluctuates greatly along with the change of climate, after a local isolated grid is formed due to faults in different operation modes, if control measures are not taken, the difference of the power unbalance amount of the local isolated grid is large, the isolated grid frequency change is possibly large, and the condition of synchronization detection cannot be met.
And when the local power grid with surplus power normally operates to transmit power to the system, when a networking line breaks down to cause disconnection of a power transmission section, if the power transmission proportion is large, appropriate control measures need to be taken to maintain the power balance of the local power grid, create conditions for synchronous grid connection detection or maintain stable operation of the local isolated power grid. At present, for the fault of the disconnection of a local power grid delivery channel, a mutually independent stability control device, a synchronous detection switching-on device, a low-frequency load shedding device and an over-frequency generator tripping device are mostly adopted to carry out mutually independent control, and the matching relation among the devices is difficult to meet. If the control measures are not properly taken, the frequency of the local power grid can oscillate repeatedly after the fault, and finally the isolated small grid is broken, for example, if the under-cut amount during the grid cutting is too large, the frequency of the isolated small grid can be increased, the frequency of the small grid can be increased, a high-frequency grid cutting device can be cut after the frequency of the small grid is increased, the controllability of the action of the high-frequency grid cutting device is poor and can be over-cut, the over-cut can also cause the system frequency to be reduced, the action of the low-frequency load reducing device can be caused after the system frequency is reduced, the low-frequency load reducing device can be over-cut and can cause the system frequency to be increased again.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a power restoration control method and device to solve the problems in the prior art.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a power supply recovery control method, which comprises the following steps:
when a line fault is detected, executing reclosing control operation according to preset reclosing time to obtain an operation result;
carrying out isolated network detection on a connecting line between a local power grid and a main grid to obtain a detection result;
and when the operation result is that the control of the reclosure fails and the detection result is that the local isolated network is detected, the power supply of the system is recovered by combining the standby power supply.
In the above scheme, the preset reclosing time includes a dissociation removal time and a synchronization detection time;
correspondingly, the executing reclosing control operation according to the preset reclosing time comprises the following steps:
and realizing reclosing control by timing and judging the dissociating time and the synchronous detection time in parallel.
In the foregoing scheme, when it is determined that the detection result is a local isolated network, the method further includes:
and determining to perform a generator tripping or load shedding control operation according to the isolated network power unbalance amount so as to enable the frequency between the local isolated network and the main network to meet the checking synchronization condition.
In the above scheme, determining to execute the operation of cutting machine or load control according to the isolated network power unbalance amount includes:
when detecting that the system frequency and the frequency change rate meet a first preset condition when the fault is removed, executing a cutting operation;
and when the system frequency and the frequency change rate when fault removal is detected to meet a second preset condition, executing load removal control operation.
In the foregoing scheme, when it is determined that the detection result is a local isolated network, the method further includes:
and reducing the frequency difference between the local isolated network and the main network by adopting a low-frequency load shedding operation or an over-frequency tripping operation until the frequency difference between the local isolated network and the main network meets the synchronization period grid-connection condition.
In the above solution, the reducing the frequency difference between the local isolated network and the main network by adopting a low-frequency load shedding operation or an over-frequency generator tripping operation includes:
if the frequency of the local isolated network is lower than the frequency of the main network and does not meet the synchronization detection condition, low-frequency load shedding operation is adopted;
and if the frequency of the local isolated network is higher than that of the main network and does not meet the synchronization detection grid connection condition, adopting an over-frequency cutting machine operation.
The embodiment of the invention also provides a power supply recovery control device, which comprises a reclosing control module, an isolated network detection module and a wide area spare power automatic switching module;
the reclosing control module is used for executing reclosing control operation according to preset reclosing time when a line fault is detected to obtain an operation result;
the isolated network detection module is used for carrying out isolated network detection on a connecting line between the local power grid and the main grid to obtain a detection result;
and the wide area spare power automatic switching module is used for recovering the system power supply by combining a spare power supply mode when the operation result is that the reclosing control fails and the detection result is that the local isolated network is adopted.
In the above scheme, the preset reclosing time includes a dissociation removal time and a synchronization detection time;
correspondingly, the reclosing control module is specifically used for realizing reclosing control through timing and parallel judgment of the dissociation removal time and the detection synchronization time.
In the above scheme, the apparatus further includes an isolated network power balancing module;
and the isolated network power balancing module is used for determining and executing a generator tripping operation or a load tripping control operation according to the isolated network power unbalance amount when the detection result is determined to be the local isolated network, so that the frequency between the local isolated network and the main network meets the synchronization condition.
In the above scheme, the isolated network power balancing module includes a first switching unit and a first switching load unit;
the first switching unit is used for executing switching operation when the system frequency and the frequency change rate meet a first preset condition when the fault is detected to be cut off;
and the first load shedding unit is used for executing load shedding control operation when the system frequency and the frequency change rate meet a second preset condition when the fault shedding is detected.
In the above scheme, the device further comprises an isolated network frequency control module;
and the isolated network frequency control module is used for reducing the frequency difference between the local isolated network and the main network by adopting a low-frequency load shedding operation or an over-frequency tripping operation when the detection result is determined to be the local isolated network until the frequency difference between the local isolated network and the main network meets the synchronization detection grid-connected condition.
In the above scheme, the isolated network frequency control module includes a second generator tripping unit and a second load tripping unit;
the second generator tripping unit is used for adopting an over-frequency generator tripping operation if the frequency of the local isolated grid is higher than the frequency of the main grid and does not meet the synchronization detection grid connection condition;
and the second load shedding unit is used for adopting low-frequency load shedding operation if the frequency of the local isolated network is lower than the frequency of the main network and does not meet the synchronization detection condition.
According to the power supply recovery control method and device provided by the embodiment of the invention, when a line fault is detected, reclosing control operation is executed according to preset reclosing time to obtain an operation result; carrying out isolated network detection on a connecting line between a local power grid and a main grid to obtain a detection result; and when the operation result is that the control of the reclosure fails and the detection result is that the local isolated network is detected, the power supply of the system is recovered by combining the standby power supply. So, through reclosing control and isolated network detection, can effectively improve the speed that local isolated network and major network were incorporated into the power networks, promote the security and the reliability of system's power supply.
Drawings
Fig. 1 is a first schematic flow chart illustrating an implementation of a power restoration control method according to an embodiment of the present invention;
fig. 2 is a logic block diagram of a reclosing control operation in the embodiment of the present invention;
fig. 3 is a schematic diagram of a second implementation flow of the power restoration control method according to the embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a third implementation process of the power restoration control method according to the embodiment of the present invention;
FIG. 5 is a logic block diagram of a cross frequency slicer in accordance with an embodiment of the present invention;
FIG. 6 is a logic block diagram of low frequency load shedding in accordance with an embodiment of the present invention;
fig. 7 is a first schematic structural diagram illustrating a power restoration control apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a second exemplary embodiment of a power supply restoration control apparatus;
fig. 9 is a schematic structural diagram of a third exemplary embodiment of a power restoration control device.
Detailed Description
In the embodiment of the invention, when a line fault is detected, reclosing control operation is executed according to preset reclosing time to obtain an operation result; carrying out isolated network detection on a connecting line between a local power grid and a main grid to obtain a detection result; and when the operation result is that the control of the reclosure fails and the detection result is that the local isolated network is detected, the power supply of the system is recovered by combining the standby power supply.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
Fig. 1 is a first schematic flow chart illustrating an implementation process of a power supply restoration control method according to an embodiment of the present invention, as shown in fig. 1, the power supply restoration control method according to the embodiment of the present invention includes:
step S101: when a line fault is detected, executing reclosing control operation according to preset reclosing time to obtain an operation result;
the preset reclosing time comprises dissociating removing time and checking synchronization time.
Specifically, a power supply recovery control device in the system is used for detecting a line, and when a line fault is determined, reclosing control is realized by timing and judging the dissociating time and the detecting synchronization time in parallel, as shown in fig. 2.
When the timing of the free removing time and the synchronization detecting time are judged in parallel, and the free removing time and the synchronization detecting time are determined to be within the reclosing delay time range, reclosing control can be realized, namely reclosing control is successful; otherwise, indicating that the reclosing control fails.
Step S102: carrying out isolated network detection on a connecting line between a local power grid and a main grid to obtain a detection result;
specifically, the networking lines of the local power grid and the main grid are monitored in real time or periodically through a power supply recovery control device in the system, whether a local isolated network is formed after the line fault is judged according to the system mode, and if all the networking lines of the system are tripped or part of the networking lines are overhauled and other networking lines are tripped, the local isolated network is judged to be formed due to the line fault.
It should be noted that, in the embodiment of the present invention, the execution of steps S101 and S102 is not limited by a chronological order.
Step S103: and when the operation result is that the control of the reclosure fails and the detection result is that the local isolated network is detected, the power supply of the system is recovered by combining the standby power supply.
Specifically, a power supply recovery control device in the system determines that the reclosing control fails after a line fault occurs, and when the line fault forms a local isolated network, a synchronous or non-closed standby power supply is detected by using a local wide area standby power automatic switching module according to a received wide area standby power automatic switching starting command, so that the power supply of the system is quickly recovered.
According to the power supply recovery control method, when a line fault is detected, reclosing control operation is executed according to preset reclosing time, and isolated network detection is carried out on a connecting line between a local power grid and a main network; and when the reclosing control fails and the detection result is a local isolated network, restoring the power supply of the system by combining the standby power supply. So, through reclosing control and isolated network detection, can effectively improve the speed that local isolated network and major network were incorporated into the power networks, promote the security and the reliability of system's power supply.
Example two
Fig. 3 is a schematic diagram of a second implementation flow of the power supply restoration control method according to the embodiment of the present invention, and as shown in fig. 3, the power supply restoration control method according to the embodiment of the present invention includes:
step S301: when a line fault is detected, executing reclosing control operation according to preset reclosing time to obtain an operation result of reclosing control failure;
the preset reclosing time comprises dissociating removing time and checking synchronization time.
When the timing of the free removing time and the synchronization detecting time are judged in parallel, and the free removing time and the synchronization detecting time are determined to be within the reclosing delay time range, reclosing control can be realized, namely reclosing control is successful; otherwise, indicating that the reclosing control fails.
Step S302: carrying out isolated network detection on a connecting line between a local power grid and a main grid to obtain a detection result of the local isolated network;
specifically, the networking lines of the local power grid and the main grid are monitored in real time or periodically through a power supply recovery control device in the system, whether a local isolated network is formed after the line fault is judged according to the system mode, and if all the networking lines of the system are tripped or part of the networking lines are overhauled and other networking lines are tripped, the local isolated network is judged to be formed due to the line fault.
It should be noted that, in the embodiment of the present invention, the execution of steps S301 and S302 is not limited by a chronological order.
Step S303: determining to execute a generator tripping or load shedding control operation according to the isolated network power unbalance amount so as to enable the frequency between the local isolated network and the main network to meet the checking synchronization condition;
specifically, the power supply recovery control device in the system determines to execute the operation of taking a power cutting machine or load cutting control according to the isolated network power unbalance amount, and the operation comprises the following steps: when detecting that the system frequency and the frequency change rate meet a first preset condition when the fault is removed, executing a cutting operation; and when the system frequency and the frequency change rate when fault removal is detected to meet a second preset condition, executing load removal control operation.
In one example, assume that the isolated network allows an over-frequency fixed value fHWith a low frequency constant value fLThe system frequency is f when the fault is removed0Frequency change rate of df0Rated frequency of the system is fnThe free time is T2, and the frequency of exchanging between isolated network and system before line fault is P0Then, the calculation method for determining to execute the operation of adopting the generator tripping or load shedding control according to the isolated network power unbalance amount is as follows:
1) if the power sent to the system by the isolated network before the line fault is P0, the frequency and the frequency change rate of the system when the fault is detected to be cut off meet the first preset condition, namely that
fH<f0+T2×df0；
Then, a cutting machine operation is adopted, wherein the corresponding cutting machine amount is as follows:
otherwise, no measures are taken;
2) if the power received by the isolated network from the system before the line fault is P0, the frequency and the frequency change rate of the system when the fault is detected to be cut off satisfy a second preset condition, namely that
fL>f0-T2×df0；
Then load shedding operation is adopted, wherein the corresponding load shedding amount is as follows:
otherwise, no measures are taken.
After the power balance control of step S303 in the embodiment of the present invention is performed, it can be ensured that the isolated network frequency is f after the dissociating time T2 is overL～fHIn the range of (2), the frequency of the local isolated network after the line fault is generally controlled within a range of 48.00Hz to 52.00Hz, so that the frequency difference between the local isolated network and the main network is ensured within an allowable range.
It should be added that if protection tripping is performed under the condition that reclosure is not charged, reclosure is in a permanent fault, a closing reclosure signal is received after the reclosure is started, the permanent fault is judged after the reclosure is started, the time exceeding the opening time of the reclosure is not coincident after the reclosure is started, and reclosure failure is caused by other reasons, the wide area spare automatic switching module is started to detect a synchronous or non-voltage-combination spare power supply, and the system power supply is quickly recovered.
Step S304: the system power supply is recovered by combining a standby power supply mode.
According to the power supply recovery control method provided by the embodiment of the invention, when the detection result is a local isolated network, a generator tripping or load shedding control operation is further determined according to the isolated network power unbalance amount, so that the frequency between the local isolated network and the main network meets the synchronization condition. Therefore, the condition of detecting synchronization grid connection can be met by controlling the basic balance of the power generation power and the load power in the local isolated network, so that the speed of grid connection of the local isolated network and the main network is effectively improved, and the safety and the reliability of system power supply are improved.
EXAMPLE III
Fig. 4 is a schematic flow chart illustrating a third implementation process of the power supply restoration control method according to the embodiment of the present invention, as shown in fig. 4, the power supply restoration control method according to the embodiment of the present invention includes:
step S401: when a line fault is detected, executing reclosing control operation according to preset reclosing time to obtain an operation result of reclosing control failure;
the preset reclosing time comprises dissociating removing time and checking synchronization time.
When the timing of the free removing time and the synchronization detecting time are judged in parallel, and the free removing time and the synchronization detecting time are determined to be within the reclosing delay time range, reclosing control can be realized, namely reclosing control is successful; otherwise, indicating that the reclosing control fails.
Step S402: carrying out isolated network detection on a connecting line between a local power grid and a main grid to obtain a detection result of the local isolated network;
specifically, the networking lines of the local power grid and the main grid are monitored in real time or periodically through a power supply recovery control device in the system, whether a local isolated network is formed after the line fault is judged according to the system mode, and if all the networking lines of the system are tripped or part of the networking lines are overhauled and other networking lines are tripped, the local isolated network is judged to be formed due to the line fault.
It should be noted that, in the embodiment of the present invention, the execution of steps S401 and S402 is not limited by a chronological order.
Step S403: reducing the frequency difference between the local isolated network and the main network by adopting a low-frequency load shedding operation or an over-frequency generator tripping operation until the frequency difference between the local isolated network and the main network meets the synchronization period grid-connection condition;
specifically, the power supply restoration control device in the system reduces the frequency difference between the local isolated network and the main network by adopting a low-frequency load shedding operation or an over-frequency cutting machine operation, and comprises the following steps: if the frequency of the local isolated network is lower than the frequency of the main network and does not meet the synchronization detection condition, low-frequency load shedding operation is adopted; and if the frequency of the local isolated network is higher than that of the main network and does not meet the synchronization detection grid connection condition, adopting an over-frequency cutting machine operation.
In an example, as shown in the logic block diagram of the over-frequency tripping machine illustrated in fig. 5, if the frequency of the local isolated grid is higher than the frequency of the main grid and the synchronization detection condition is not satisfied, the over-frequency tripping machine is tripped by adopting a continuous splitting wheel trial tripping method until the synchronization detection condition is satisfied, and the criteria of the over-frequency tripping machine are as follows:
f≥fH，t≥n×TfH，n＝1,2,3,4……
wherein, TfH-represents an over-frequency action delay.
In another example, as shown in the logic block diagram of low-frequency load shedding described in fig. 6, if the frequency of the local isolated grid is lower than the frequency of the main grid and does not meet the synchronization detection condition, the load shedding is performed by adopting a method of trial shedding in successive rounds until the synchronization detection condition is met, and the criteria for low-frequency load shedding are as follows:
f≤fL，t≥n×TfL，n＝1,2,3,4……
wherein, TfL-representing low frequency motion delay.
Step S404: the system power supply is recovered by combining a standby power supply mode.
According to the power supply recovery control method provided by the embodiment of the invention, when the detection result is a local isolated network, the frequency difference between the local isolated network and the main network is further reduced by adopting a low-frequency load shedding operation or an over-frequency tripping operation, so that the frequency difference between the local isolated network and the main network meets the synchronization detection condition. Therefore, when some unexpected special conditions are generated in the process of detecting synchronization grid connection and the synchronization condition is not met, the frequency difference between the isolated grid and the main grid is reduced by adopting a continuous control method of trial cut in different rounds until the synchronization condition is met, so that the defect that the frequency oscillation is caused by that the load is cut by a traditional low-frequency load shedding or over-frequency cutting machine according to a fixed round cutting machine in too few rounds and the cut amount of each round is relatively large and the overshoot is possibly caused is overcome, the speed of grid connection of the local isolated grid and the main grid is effectively improved, and the safety and the reliability of power supply of a system are improved.
Example four
Fig. 7 is a schematic structural diagram of a power supply restoration control apparatus according to an embodiment of the present invention, and as shown in fig. 7, the apparatus includes a reclosing control module 701, an isolated network detection module 702, and a wide area backup automatic switching module 703; wherein,
the reclosing control module 701 is configured to, when a line fault is detected, execute reclosing control operation according to preset reclosing time to obtain an operation result;
the isolated network detection module 702 is configured to perform isolated network detection on a tie line between the local power grid and the main grid to obtain a detection result;
the wide area backup automatic switching module 703 is configured to recover the system power supply by switching on a backup power supply when the operation result is that the reclosing control fails and the detection result is that the local isolated network is detected.
In an embodiment, the preset reclosing time includes a dissociation removal time and a detection synchronization time;
correspondingly, the reclosing control module 701 is specifically configured to implement reclosing control by performing parallel determination on the timing of the dissociation removal time and the detection synchronization time.
In an embodiment, as shown in fig. 8, the apparatus further comprises an isolated network power balancing module 704;
and the isolated network power balancing module 704 is configured to determine to perform a generator tripping or load shedding control operation according to the isolated network power unbalance amount when the detection result is determined to be the local isolated network, so that the frequency between the local isolated network and the main network meets the synchronization condition.
In an embodiment, as shown in fig. 8, the isolated network power balancing module 704 includes a first cutter unit 7041 and a first cutter load unit 7042;
the first switching unit 7041 is configured to execute a switching operation when it is detected that the system frequency and the frequency change rate during fault removal satisfy a first preset condition;
the first load shedding unit 7042 is configured to perform a load shedding control operation when the system frequency and the frequency change rate at the time of detecting that the fault is shed satisfy a second preset condition.
In one embodiment, as shown in fig. 9, the apparatus further comprises an isolated network frequency control module 705;
the isolated network frequency control module 705 is configured to reduce a frequency difference between the local isolated network and the main network by adopting a low-frequency load shedding operation or an over-frequency tripping operation when it is determined that the detection result is the local isolated network until the frequency difference between the local isolated network and the main network meets a synchronization detection grid connection condition.
In an embodiment, as shown in fig. 9, the isolated network frequency control module 705 includes a second load shedding unit 7051 and a second load shedding unit 7052;
the second generator tripping unit 7051 is configured to, if the frequency of the local isolated grid is higher than the frequency of the main grid and does not meet the synchronization detection grid connection condition, perform an operation of a cross-frequency generator tripping;
the second load shedding unit 7052 is configured to, if the frequency of the local isolated grid is lower than the frequency of the main grid and does not meet the synchronization detection period grid connection condition, perform low-frequency load shedding operation.
In practical application, each module in the power supply restoration control device and each unit included in each module provided in the embodiment of the present invention may be implemented by a processor in the device, or may be implemented by a specific logic circuit; for example, in practical applications, the device may be implemented by a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), or a Field Programmable Gate Array (FPGA) located in the device.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (12)
1. A power restoration control method, the method comprising:
when a line fault is detected, executing reclosing control operation according to preset reclosing time to obtain an operation result;
carrying out isolated network detection on a connecting line between a local power grid and a main grid to obtain a detection result;
and when the operation result is that the control of the reclosure fails and the detection result is that the local isolated network is detected, the power supply of the system is recovered by combining the standby power supply.
2. The method of claim 1, wherein the preset reclosing time comprises a deionization time and a check period time;
correspondingly, the executing reclosing control operation according to the preset reclosing time comprises the following steps:
and realizing reclosing control by timing and judging the dissociating time and the synchronous detection time in parallel.
3. The method of claim 1, wherein when the detection result is determined to be a local isolated network, the method further comprises:
and determining to perform a generator tripping or load shedding control operation according to the isolated network power unbalance amount so as to enable the frequency between the local isolated network and the main network to meet the checking synchronization condition.
4. The method of claim 3, wherein determining to perform a tripping or load shedding control operation based on the isolated grid power imbalance comprises:
when detecting that the system frequency and the frequency change rate meet a first preset condition when the fault is removed, executing a cutting operation;
and when the system frequency and the frequency change rate when fault removal is detected to meet a second preset condition, executing load removal control operation.
5. The method according to any one of claims 1 to 4, wherein when the detection result is determined to be a local isolated network, the method further comprises:
and reducing the frequency difference between the local isolated network and the main network by adopting a low-frequency load shedding operation or an over-frequency tripping operation until the frequency difference between the local isolated network and the main network meets the synchronization period grid-connection condition.
6. The method of claim 5, wherein reducing the frequency difference between the local isolated network and the main network by taking the form of a low frequency load shedding operation or an over frequency tripping operation comprises:
if the frequency of the local isolated network is lower than the frequency of the main network and does not meet the synchronization detection condition, low-frequency load shedding operation is adopted;
and if the frequency of the local isolated network is higher than that of the main network and does not meet the synchronization detection grid connection condition, adopting an over-frequency cutting machine operation.
7. The power supply recovery control device is characterized by comprising a reclosing control module, an isolated network detection module and a wide-area spare power automatic switching module;
the reclosing control module is used for executing reclosing control operation according to preset reclosing time when a line fault is detected to obtain an operation result;
the isolated network detection module is used for carrying out isolated network detection on a connecting line between the local power grid and the main grid to obtain a detection result;
and the wide area spare power automatic switching module is used for recovering the system power supply by combining a spare power supply mode when the operation result is that the reclosing control fails and the detection result is that the local isolated network is adopted.
8. The apparatus of claim 7, wherein the preset reclosing time comprises a deionization time and a check period time;
correspondingly, the reclosing control module is specifically used for realizing reclosing control through timing and parallel judgment of the dissociation removal time and the detection synchronization time.
9. The apparatus of claim 7, further comprising an isolated network power balancing module;
and the isolated network power balancing module is used for determining and executing a generator tripping operation or a load tripping control operation according to the isolated network power unbalance amount when the detection result is determined to be the local isolated network, so that the frequency between the local isolated network and the main network meets the synchronization condition.
10. The apparatus of claim 9, wherein the isolated network power balancing module comprises a first cutter unit and a first cutter load unit;
the first switching unit is used for executing switching operation when the system frequency and the frequency change rate meet a first preset condition when the fault is detected to be cut off;
and the first load shedding unit is used for executing load shedding control operation when the system frequency and the frequency change rate meet a second preset condition when the fault shedding is detected.
11. The apparatus of any one of claims 7 to 10, further comprising an isolated network frequency control module;
and the isolated network frequency control module is used for reducing the frequency difference between the local isolated network and the main network by adopting a low-frequency load shedding operation or an over-frequency tripping operation when the detection result is determined to be the local isolated network until the frequency difference between the local isolated network and the main network meets the synchronization detection grid-connected condition.
12. The apparatus of claim 11, wherein the isolated network frequency control module comprises a second generator tripping unit and a second load shedding unit;
the second generator tripping unit is used for adopting an over-frequency generator tripping operation if the frequency of the local isolated grid is higher than the frequency of the main grid and does not meet the synchronization detection grid connection condition;
and the second load shedding unit is used for adopting low-frequency load shedding operation if the frequency of the local isolated network is lower than the frequency of the main network and does not meet the synchronization detection condition.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217334A (en) * | 2017-07-07 | 2019-01-15 | 南方电网科学研究院有限责任公司 | Power control method and device |
| CN110336315A (en) * | 2019-06-04 | 2019-10-15 | 深圳供电局有限公司 | Isolated network operation control system for local power grid of receiving-end city |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951016A (en) * | 2010-04-22 | 2011-01-19 | 广东电网公司 | Wide area information-based automatic standby power supply switching adaptive modeling and controlling method |
| CN201805272U (en) * | 2010-06-25 | 2011-04-20 | 广东省电力调度中心 | Intelligent incoming line standby power self-input device for regions having rich small hydropower stations |
| CN102075005A (en) * | 2011-01-18 | 2011-05-25 | 广东电网公司电力科学研究院 | Processing method for 110KV zone automatic standby power switching action on basis of EMS (Engine Management System) system |
-
2015
- 2015-07-30 CN CN201510460294.0A patent/CN105098770A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951016A (en) * | 2010-04-22 | 2011-01-19 | 广东电网公司 | Wide area information-based automatic standby power supply switching adaptive modeling and controlling method |
| CN201805272U (en) * | 2010-06-25 | 2011-04-20 | 广东省电力调度中心 | Intelligent incoming line standby power self-input device for regions having rich small hydropower stations |
| CN102075005A (en) * | 2011-01-18 | 2011-05-25 | 广东电网公司电力科学研究院 | Processing method for 110KV zone automatic standby power switching action on basis of EMS (Engine Management System) system |
Non-Patent Citations (1)
| Title |
|---|
| 田霖等: "广域保护中功率平衡策略的研究", 《2013第十四届全国保护和控制学术研究会》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217334A (en) * | 2017-07-07 | 2019-01-15 | 南方电网科学研究院有限责任公司 | Power control method and device |
| CN109217334B (en) * | 2017-07-07 | 2020-11-20 | 南方电网科学研究院有限责任公司 | Power control method and device |
| CN110336315A (en) * | 2019-06-04 | 2019-10-15 | 深圳供电局有限公司 | Isolated network operation control system for local power grid of receiving-end city |
| CN110336315B (en) * | 2019-06-04 | 2023-03-03 | 深圳供电局有限公司 | Isolated network operation control system for local power grid of receiving-end city |
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