CN107086580B - Ring network intelligent control system and control method thereof - Google Patents
Ring network intelligent control system and control method thereof Download PDFInfo
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- CN107086580B CN107086580B CN201710403378.XA CN201710403378A CN107086580B CN 107086580 B CN107086580 B CN 107086580B CN 201710403378 A CN201710403378 A CN 201710403378A CN 107086580 B CN107086580 B CN 107086580B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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Abstract
The invention discloses an intelligent looped network control system, which comprises more than two transformers, wherein the high-voltage side of each transformer is connected with a high-voltage line, the low-voltage side of each transformer is provided with a low-voltage bus, each low-voltage bus is connected with at least two paths of load loops, the intelligent looped network control system further comprises a control cabinet, each control cabinet comprises a control center and a connecting device, each connecting device comprises a connecting bus and a plurality of connecting loops, each connecting loop is correspondingly arranged with each transformer, one end of each connecting loop is connected with each connecting bus, each load loop comprises a calling loop, the other end of each connecting loop is connected with each calling loop, each connecting loop and each calling loop are respectively provided with a switching mechanism, each switching mechanism is electrically connected with each control center, and each control center controls each switching mechanism. The technical scheme of the invention is realized by virtue of the embedded computer, the manual intervention is not needed, the manual investment is reduced, the manual operation on the line is reduced, and the working risk possibly encountered by staff is reduced.
Description
Technical Field
The invention belongs to the technical field of power distribution control, and particularly relates to an intelligent control system and a control method of a ring network.
Background
With the advent of the era of intelligent and digital electricity, a new trend has appeared in the traditional electricity supply network, especially in the network distribution link, from passive response to dynamic supply and demand balance of the electric power system by monitoring and control. The traditional centralized and unidirectional power grid structure can not meet the requirements of novel intelligent cities, and an intelligent distribution network system which is interactive, controllable in sense, safe and reliable is needed in the future.
The power distribution network is a key link of electric energy distribution and electric power demand feedback, and has wide coverage and complex scene. In the current city, the low-voltage distribution transformer in the urban village area adopts a radiation type wiring mode, and the low-voltage distribution network has no connecting line. During the period of peak-facing summer, the urban village area has power supply tension, and the urban village power distribution loads of the multiple distribution transformers are unevenly distributed. The heavy load and the light load are matched and changed simultaneously under the influence of load development. Meanwhile, when a single distribution transformer fails, the low-voltage load cannot be adjusted to other distribution transformers, the power supply reliability is low, during peak load, the transformer loop is easy to be short-circuited due to overload or overload, the transformer is burnt, peak-staggering power failure is normally carried out in order to avoid the situation, but due to high power consumption, the requirement of the peak-staggering power consumption can be met by a power failure party frequently, and more customer complaints are caused.
Therefore, in order to solve the problems that the distribution load cannot be redistributed, the power supply reliability is low and the like in the current wiring of the low-voltage distribution network in the urban village, the existing distribution ring network is modified.
Disclosure of Invention
The invention aims to provide a looped network intelligent control system capable of automatically distributing load and improving power supply reliability and a control method thereof.
The technical scheme for solving the technical problems is as follows:
the utility model provides a looped netowrk intelligent control system, includes two above transformers, the transformer high pressure side is connected with the high voltage line, and the low pressure side is provided with the low pressure generating line, the low pressure generating line is connected two way at least load return circuits, still includes the switch board, the switch board includes control center and interconnection device, interconnection device include a interconnection generating line with a plurality of interconnection return circuits the interconnection return circuit with the transformer corresponds the setting, interconnection return circuit one end with interconnection generating line links to each other, the load return circuit includes that the return circuit is called all the way, the interconnection return circuit other end with the return circuit is connected, interconnection return circuit with the return circuit all is equipped with switch mechanism, switch mechanism with control center links to each other, control center control switch mechanism.
The other corresponding technical scheme adopted by the invention is as follows:
a looped network intelligent control method applied to a looped network intelligent control system comprises the following steps:
s1, acquiring electric parameter data of a corresponding calling loop and a corresponding transformer low-voltage side by the digital display meter, and sending the electric parameter data to a control center;
s2, the embedded computer of the control center analyzes the electric parameter data of all calling loops and the low-voltage side of the transformer, and judges the states of the transformers, wherein the states comprise a power-off state, an overload state, a normal state and an idle state;
s3, the embedded computer opens the switching mechanism of the calling loop corresponding to the transformer in the power-off state or the overload state, closes the switching mechanism of the connecting loop connected with the calling loop corresponding to the transformer in the power-off state or the overload state, and simultaneously closes the switching mechanisms of the calling loop and the connecting loop corresponding to the transformer in the idle state, thereby realizing loop transfer.
The invention has the following beneficial effects: according to the invention, one path of load loops in the transformers are transformed to form the calling loops, so that corresponding calling loops in the transformers form a state of mutual standby through the connecting loops, when a certain transformer is possibly overloaded and overloaded, the calling loops of the transformer are called to the transformers in an empty state to supply power, the overload possibility of the transformer is reduced, the problem of transformer burning caused by overload is solved, and meanwhile, the mode of peak-staggering power failure is avoided, so that the problem of frequent power failure is solved; in addition, the technical scheme of the invention depends on the embedded computer to judge, can be realized without manual intervention, reduces the input of manual work, reduces the manual operation on the line, and reduces the working risk possibly encountered by staff.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system framework of the present invention;
FIG. 3 is a schematic diagram of a control cabinet frame of the present invention;
FIG. 4 is a diagram illustrating the operation of the present invention;
FIG. 5 is a specific operation diagram of step S2 of the present invention;
the meaning of each number in the drawings is as follows:
the intelligent control system comprises a transformer 1, a low-voltage bus 2, a load circuit 3, a calling circuit 31, a control cabinet 4, a control center 5, a built-in computer 51, a touch screen 52, an alarm module 53, a communication device 6, a communication bus 61, a communication circuit 62, a switching mechanism 7, a transformer 71, an electrically operated circuit breaker 72 and a digital display 73.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The ring network intelligent control system of the embodiment of the invention is shown in fig. 1-3, and comprises more than two transformers 1, wherein the high-voltage side of each transformer 1 is connected with a high-voltage line, the low-voltage side is provided with a low-voltage bus 2, the low-voltage bus 2 is connected with at least two paths of load loops 3, the ring network intelligent control system further comprises a control cabinet 4, the control cabinet 4 comprises a control center 5 and a connecting device 6, the connecting device 6 comprises a connecting bus 61 and a plurality of connecting loops 62, the connecting loops 62 are correspondingly arranged with the transformers 1, one end of each connecting loop 62 is connected with the connecting bus 61, the other end of each connecting loop 62 is connected with the corresponding calling loop 31, the connecting loops 62 and the calling loops 31 are respectively provided with a switching mechanism 7, the switching mechanism 7 is connected with the control center 5, and the control center 5 controls the switching mechanism 7. The load loop 3 is at least two ways, and can be increased without limitation on the premise that the load of the transformer 1 is not exceeded, in the looped network intelligent control system, more than two transformers 1 are arranged, the more than two transformers 1 are standby, namely, a calling loop 31 in the transformer 1 can be used as a calling load loop 3, a calling loop 31 of the other transformer 1 can be introduced through a connecting device 6 to supply power, particularly, the calling or the leading-out of a control center 5 is used for judging, and the loop switching is performed if the loop is in a power-losing state or in an overload state or in a non-overload state, and the loop switching is possibly provided if the loop is in an idle state. All connections herein are electrical connections.
The connection device 6 is mainly used for connecting a plurality of transformers 1, the number of connection loops 62 in the connection device 6 is the same as or slightly more than that of the transformers 1 connected with the connection device, so that the call loops 31 of each transformer 1 can be correspondingly connected to one connection loop 62 in the connection device 6, all connection loops 62 are connected through connection buses 61 and communicated, when the system works, the call loops 31 in one transformer 1 can be transferred to the call loops 31 of the other transformer 1 by carrying out closing or opening operation on the switching mechanism 7 of the corresponding loop, and the power is supplied by the transformer 1, so long as the call loops 31 connected to the connection device 6 are in a standby state under the action of the connection device 6, namely, the transformers 1 connected to the control cabinet 4 are standby transformers of other transformers in the connection network.
Specifically, the switch mechanism 7 includes a digital display meter 73, a transformer 71 and an electric operating circuit breaker 72, the digital display meter 73 is connected with the control center 5, a step-down resistor is built in the digital display meter 73, so that low-voltage bus voltage data of the low-voltage side of the transformer 1 and load voltage data of a corresponding loop can be identified, the transformer 71 is connected with the digital display meter 73, the transformer 71 is a current transformer and is used for acquiring low-voltage bus current data of the low-voltage side of the transformer 1 and load current data of the corresponding loop, the transformer 71 transmits acquired electric parameter data to the digital display meter 73, the digital display meter 73 displays the acquired electric parameter data and the electric parameter data transmitted by the transformer 71, and simultaneously transmits all the electric parameter data to the control center 5 for analysis by the control center 5, so that the state of the loop can be known at the end of the loop, and the relevant information can be acquired without going to the control cabinet 4. The control center 5 controls the electrically operated circuit breaker 72. The switch mechanism 7 on the call loop 31 is disposed at the head end or the tail end of the call loop 31, and the switch mechanism 7 on the interconnection loop 62 is disposed on a line between the call loop 31 and the interconnection bus. The electric operation circuit breaker 72 can automatically realize the opening and closing of the circuit breaker by receiving signals, so that the electric operation circuit breaker can be directly operated by the control center 5, human interference is reduced, accidents are avoided, preferably, the electric operation circuit breaker 72 is an HNH 800N series plastic-case circuit breaker, the digital display meter 73 and the transformer 72 are of an integrated structure, and an STM-630A type intelligent electric power instrument is preferably selected.
The control center 5 comprises an embedded computer 51, a touch screen 52 and an alarm module (53), wherein the embedded computer 51 is a main body of the control center 5, and the touch screen 52 is connected with the embedded computer 51. The touch screen 52 is mainly used for displaying the operation and the operation condition of the embedded computer 51, and is also used as a medium for inputting instructions to the embedded computer 51, the alarm module (53) is controlled by the embedded computer (51), after the embedded computer 51 analyzes and judges the data transmitted by the transformer 71, whether the transfer work is implemented or not is determined, the normal setting is that the embedded computer 51 judges that the transfer of the loop is possible, that is, the transfer of the loop is possible, that the operation is not possible, the alarm is carried out through the alarm module 53, and meanwhile, the manual operation is also provided, so that the transfer of the loop is realized through the manual operation when the embedded computer 51 does not implement the operation.
The invention discloses a looped network intelligent control method applied to a looped network intelligent control system, which is shown in figures 4-5 and comprises the following steps:
s1, an digital display table 73 acquires electric parameter data corresponding to the calling loop 31 and the low-voltage side of the corresponding transformer 1 and sends the electric parameter data to a control center 5;
s2, the embedded computer 51 of the control center 5 analyzes the electric parameter data of all calling loops 31 and the low-voltage side of the transformer 1, judges the states of the transformers 1, wherein the states comprise a power-off state, an overload state, a normal state and an idle state, and starts loop transfer when judging that one transformer 1 is in the power-off state or the overload state and another transformer 1 is in the idle state;
s21, the embedded computer monitors all low-voltage bus voltage data, if the low-voltage bus voltage data is lower than a power failure set value, the corresponding transformer 1 is judged to be in a power failure state, judgment of the overload and overload states is stopped, and step S24 is executed, otherwise, step S22 is executed;
s22, the embedded computer 51 sorts the low-voltage bus current data according to the high-voltage bus current data;
s23, comparing the highest low-voltage bus current data, judging whether the corresponding transformer 1 exceeds the overload and overload set values, if so, judging that the corresponding transformer 1 is in the overload and overload state, otherwise, judging that the loop is in the normal state, and ending the operation;
s24, when the transformer 1 is judged to be in a power-off state or an overload state, the embedded computer 51 orders load current data from low to high;
s25, comparing the lowest load current data, judging whether the corresponding transformer 1 is lower than an idle set value, if so, judging that the corresponding transformer 1 is in an idle state, and executing step S3, otherwise, judging that the corresponding transformer 1 cannot meet the requirement of loop transfer, and stopping operation to start the alarm module 53 to alarm.
S3, the embedded computer 51 opens the switching mechanism 7 of the calling loop 31 corresponding to the transformer 1 in the power-off state or the overload state, closes the switching mechanism 7 of the connecting loop 62 connected with the calling loop 31 corresponding to the transformer 1 in the power-off state or the overload state, and simultaneously closes both the calling loop 31 corresponding to the transformer 1 in the idle state and the switching mechanism 7 on the connecting loop 62 to realize loop transfer;
and S4, the embedded computer 51 monitors the electrical parameter data of the transformer 1, and when the electrical parameter data of the transformer 1 in the loop transfer is lower than an idle set value, the corresponding switch mechanism 7 is reset to release the loop transfer.
The above method steps integrally realize the overall operation of a looped network intelligent control system, in the process of judging whether to transfer, the power-losing set value, the overload set value and the idle set value need to be set in advance, the overload set value and the overload set value comprise the overload set value and the overload set value, the overload set value does not exceed the rated current value of the transformer 1, the overload set value is generally set under the designated current value of the transformer 1 according to the data of 0.7-0.9 times of the designated current value, the overload set value is the designated current of the transformer 1, the overload set value is generally determined, the circuit transfer is mainly carried out directly after the overload set value is generally carried out for a long duration, if the data exceeds the overload set value, the circuit transfer is carried out quickly, the best state of the idle set value is 0, namely the circuit is in no load, but in actual condition, the condition cannot exist, therefore, the idle set value is generally set according to 0.05-0.15 times of the designated current value of the transformer 1, when the calling loop 31 in the overload transformer 1 is connected to the idle transformer 1 through the connecting loop 62, the idle transformer 1 cannot cause the damage to the idle transformer 1, namely the power-losing state is the voltage of 0, and the current of the idle set value is generally 0, namely the voltage is in the low voltage state. The switching mechanism 7 arranged In the interconnecting circuit 62 collects the voltage and the current In the interconnecting circuit 62 and the low-voltage side of the transformer 1, and sends the electrical parameter data to the control center 5, when the embedded computer 51 finds that the electrical parameter data of the interconnecting circuit 62 and the low-voltage side of the transformer 1 is lower than the idle set value, the corresponding transformer 1 is generally considered to have no overload and overload state, so that the dedicated circuit is canceled, namely the corresponding switch is reset, the calling circuit 31 which is originally called is converted back to the original circuit, and the original transformer 1 is used for supplying power, preferably, the transformer 1 is 630kAV transformer with the rated current value in=909A, and the current value Ir=727A is formulated.
In the above, when judging the power failure, overload and heavy load state, the power failure delay T1, the overload delay T2 and the heavy load delay T3 are also set, when judging that the loop is in an abnormal state, the delay of a certain time is judged again, so that the power failure, overload and heavy load state is ensured to be effective, the power failure delay is 0-10 seconds, the overload delay is 0-10 seconds, and the heavy load delay is 1200-3600 seconds.
The intelligent control system and the control method thereof realize the transformation of the power distribution network, reduce the possibility of overload of the transformer 1, and simultaneously provide a temporary solution for transferring the loop when power is lost.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (6)
1. The utility model provides a looped netowrk intelligent control system, includes transformer (1) more than two, transformer (1) high-voltage side is connected with the high-voltage line, and the low-voltage side is provided with low-voltage busbar (2), at least two load return circuits (3), its characterized in that are connected to low-voltage busbar (2): still include switch board (4), switch board (4) include control center (5) and interconnection device (6), interconnection device (6) include one interconnection busbar (61) with a plurality of interconnection loops (62), interconnection loop (62) with transformer (1) are corresponding to be set up, interconnection loop (62) one end with interconnection busbar (61) link to each other, load circuit (3) include one way call return circuit (31), interconnection loop (62) other end with call return circuit (31) are connected, interconnection loop (62) with call return circuit (31) all are equipped with switch gear (7), switch gear (7) with control center (5) link to each other, control center (5) control switch gear (7), switch gear (7) include digital display table (73), mutual inductor (71) and electric operating circuit breaker (72), control center (5) with digital display table (73) link to each other, mutual inductor (71) with display table (73) link to each other, control center (5) are equipped with switch gear (7), control center (5) include touch-sensitive electronic control center (72), the embedded computer (51) is a main body of the control center (5), and the touch screen (52) is connected with the embedded computer (51);
the method also comprises a looped network intelligent control method applied to the looped network intelligent control system, and comprises the following steps:
s1, an digital display meter (73) acquires electric parameter data corresponding to a calling loop (31) and a corresponding transformer (1) low-voltage side and sends the electric parameter data to a control center (5);
s2, an embedded computer (51) of a control center (5) analyzes electric parameter data of all calling loops (31) and low-voltage sides of the transformers (1), and judges states of the transformers (1) respectively, wherein the states comprise a power-losing state, an overload state, a normal state and an idle state, and loop transfer is started when judging that one transformer (1) is in the power-losing state or the overload state and the other transformer (1) is in the idle state; the method further comprises the following steps: s21, the embedded computer monitors all low-voltage bus voltage data, if the low-voltage bus voltage data is lower than a power failure set value, the corresponding transformer (1) is judged to be in a power failure state, judgment of overload and overload states is stopped, and step S24 is executed, otherwise, step S22 is executed; s22, sequencing low-voltage bus current data according to the high-voltage bus current data by the embedded computer (51); s23, comparing the highest low-voltage bus current data, judging whether the corresponding transformer (1) exceeds an overload and overload set value, if so, judging that the corresponding transformer (1) is in the overload and overload state, otherwise, judging that the loop is in a normal state, and ending the operation; s24, when the transformer (1) is judged to be in a power-off state or an overload state, the embedded computer (51) ranks load current data from low to high; s25, comparing the lowest load current data, judging whether the corresponding transformer (1) is lower than an idle set value, if so, judging that the corresponding transformer (1) is in an idle state, executing step S3, otherwise, judging that the corresponding transformer (1) cannot meet the requirement of loop transfer, and stopping operation to start an alarm module (53) to alarm;
s3, the embedded computer (51) opens the switching mechanism (7) of the calling loop (31) corresponding to the transformer (1) in the power-losing state or the overload state, closes the switching mechanism (7) of the connecting loop (62) connected with the calling loop (31) corresponding to the transformer (1) in the power-losing state or the overload state, and simultaneously closes the switching mechanisms (7) on the calling loop (31) and the connecting loop (62) corresponding to the transformer (1) in the idle state, thereby realizing loop transfer.
2. The ring network intelligent control system of claim 1, wherein: the transformer (71) is a current transformer.
3. The ring network intelligent control system of claim 1, wherein: the switch mechanism (7) on the calling loop (31) is arranged at the head end or the tail end of the calling loop (31).
4. A looped network intelligent control system according to claim 3, wherein: the control center is also provided with an alarm module (53), and the alarm module (53) is controlled by the embedded computer (51).
5. The ring network intelligent control system of claim 1, wherein: the electrical parameter data includes low voltage bus current data, load current data, low voltage bus voltage data, and load voltage data.
6. The intelligent control system according to any one of claims 1-5, wherein: the looped network intelligent control method further comprises the following steps:
s4, the embedded computer (51) monitors the electrical parameter data of the transformer (1), and when the electrical parameter data of the transformer (1) in loop transfer is lower than an idle set value, the corresponding switching mechanism (7) is reset to release the loop transfer.
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| CN109697539A (en) * | 2017-10-23 | 2019-04-30 | 云南电网有限责任公司 | A kind of efficient identification method of distribution risk |
| CN110492477A (en) * | 2019-08-02 | 2019-11-22 | 全球能源互联网研究院有限公司 | A kind of loop network control device and control method |
| CN110783915A (en) * | 2019-10-30 | 2020-02-11 | 威胜电气有限公司 | Multi-distribution-platform-area power supply method and power supply system |
| CN112152205A (en) * | 2020-09-08 | 2020-12-29 | 南京德尔森电气有限公司 | Intelligent low-voltage automatic switching management unit and management method |
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