JP2012060837A - Transformer parallel operation prevention device and substation monitoring and control system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent parallel operation of transformers exceeding a set number of units surely by determining, when any system operation is exercised, whether transformers are operated in parallel exceeding the set number of units and then, if those transformers are found to be exceeding the set number of units, by automatically locking the exercised operation.SOLUTION: An input unit 12 takes in contact point information which indicates an on or off state of a disconnector or a circuit breaker, etc. which are system constituent apparatuses. A determination unit 11 keeps track of system status based on the contact point information taken in by the input unit 12 and, when operation of any system constituent apparatus by an HMI unit 14 is to be exercised, determines which operation state the transformers will assume. An output unit 13, upon receiving the determination result of the determination unit 11, checks to see if the number of transformers operated in parallel is determined to be exceeding the limit by the determination unit 11 and, if so, outputs a directive for locking the operation of a system constituent apparatus by the HMI unit 14 which is the ground for the determination made.

Description

  Embodiments described herein relate generally to a transformer parallel operation prevention device that prevents a transformer from being operated in parallel beyond a preset number, and a substation monitoring and control system using the same.

  Generally, a plurality of substation systems having different voltage classes are provided in a substation in the power system. Bus lines are arranged in these substation systems, and disconnectors, circuit breakers, and the like, which are system components, are connected to the bus lines. In such a substation, in order to efficiently distribute power, substation systems having different voltage classes are coupled by a transformer. The transformers are connected in a system configuration that is connected in parallel, and a plurality of transformers are operated in parallel.

  By increasing the number of transformers, it is possible to increase the amount of energy handled at the substation. At this time, if the amount of energy handled increases, the current flowing through the system also increases in proportion thereto. If the current flowing through the grid increases, there is a possibility that the accident cannot be removed correctly if an accident occurs in the power system. In addition, if the amount of energy handled at the substation is large, power outages can be widespread. Therefore, a substation with a large number of transformers is strongly required to have a highly reliable monitoring system, and various monitoring control systems such as Patent Document 1 have been proposed.

  By the way, about the transformer operated in parallel, the operation number and tap value are the monitoring object. That is, it is not desirable that a certain number or more of transformers are operated in parallel at the substation. Therefore, the maximum allowable number is set for the transformers operated in parallel, and the set number is not exceeded. In a conventional substation, an operator visually grasps the power system operation state of the substation and manually operates the system. This prevents the transformers from operating in parallel beyond the set number. In addition, regarding the monitoring of the tap value of the transformer, the operator knows the operating state of the transformer visually. And the conversion rate of the transformers operated in parallel is made uniform by performing operation which matches the tap value of the tap change mechanism at the time of load attached to a transformer to the same value.

JP 2001-8366 A

  As already mentioned, when the operator grasps the power system operation state and the operation state of the transformer, it relies on the operator's visual observation. As a result, mistakes such as operator misunderstandings and misunderstandings may occur. In addition, since the system operation is manually performed by the operator, an operation error may occur. That is, since the transformer operation state confirmation work and system operation are work by human system, human error may occur. As a result, more transformers than the set number may be operated in parallel, or transformers having different tap values may be operated in parallel.

  In the transformer parallel operation preventing apparatus and the substation monitoring and control system using the same according to the embodiment, it is proposed in order to solve the above-mentioned problems, and is set when any system operation is performed. Transformers that exceed the set number by automatically determining the number of transformers that are operated in parallel beyond the number of units and determining that the number of transformers that are operated in parallel exceeds the set number. The purpose of this is to prevent parallel operation.

  In order to achieve the above object, the transformer parallel operation preventing apparatus according to the embodiment is provided with a plurality of substation systems having different voltage classes, and the substation system includes system components including a bus, a disconnector, and a circuit breaker. In the substation in which the substation systems having different voltage classes are coupled by a transformer, and the transformer is connected so as to be able to operate in parallel, the following characteristics are provided.

  That is, an input unit, an interface unit, a determination unit, and an output unit are provided. The input means is a part for inputting contact information indicating the on / off state of the system components in order to grasp the state of the substation system and the connection state of the transformer. The interface means is a part where the operator performs an on / off operation of the system components.

  Assuming that the operator operates an arbitrary system operation on the interface unit, the determination unit determines whether the number of transformers operated in parallel with the operation exceeds a preset number. It is comprised so that it may determine based on the input contact information. Further, in the output means, when the determination means determines that the number of transformers operated in parallel exceeds the set number, a lock command for the system operation is output.

The lineblock diagram of the transformer parallel operation prevention device concerning a 1st embodiment. The single wire connection figure which shows the system configuration example of a substation. The single wire connection figure which shows the example by which a transformer is operated in parallel. The single wire connection figure which shows the example which a circulating current generate | occur | produces because the tap value of the transformer currently operated in parallel differs. The single wire connection figure which shows the example of the location which locks operation of an apparatus. The flowchart which shows the parallel operation determination process of a transformer. The flowchart which shows the lock process of parallel operation operation. In 2nd Embodiment, it is a single wire connection diagram for demonstrating the principle of a topology system, Comprising: An initial state is shown. In 2nd Embodiment, it is a single wire connection diagram for demonstrating the principle of a topology system, Comprising: The parallel operation state of a transformer is shown. The block diagram of the substation monitoring control system which concerns on 3rd Embodiment. The block diagram of the substation monitoring control system which concerns on 4th Embodiment. It is a single wire connection diagram for demonstrating other embodiment, Comprising: An initial state is shown. It is a single line connection diagram for demonstrating other embodiment, Comprising: Accident generation | occurrence | production and a system alignment state are shown. It is a single wire connection diagram for demonstrating other embodiment, Comprising: A parallel driving | running recovery state is shown.

(1) First Embodiment [Configuration]
Hereinafter, the transformer parallel operation preventing apparatus according to the first embodiment will be specifically described with reference to FIGS. FIG. 1 is a functional block diagram of the first embodiment. As shown in FIG. 1, the transformer parallel operation preventing apparatus 1 includes a determination unit 11, an input unit 12, an output unit 13, and an HMI unit 14.

  Among these, the input part 12 is a part which takes in the contact information of each apparatus which comprises a system | strain. The contact information captured by the input unit 12 is information indicating the on / off state of a disconnector or a circuit breaker that is a system component device, and data for grasping the state of the substation system and the connection state of the transformer, Become. The HMI unit 14 is a human interface means for interfacing between the substation operator and the system component equipment. The system component equipment on / off operation, the transformer tap value and the function setting of each device, This is a part where the operator performs manual operations for various operations such as setting the maximum allowable number of transformers operated in parallel.

  The determination unit 11 grasps the system state based on the contact information taken in by the input unit 12, and when the HMI unit 14 operates any system configuration device, what operation state the transformer is in. This is a part for determining based on a logic method (described later). More specifically, the determination unit 11 performs the following three determinations. First, the determination unit 11 determines whether the transformers in the substation are operated in parallel.

  Further, the determination unit 11 assumes that the HMI unit 14 operates any system configuration device, and as a result of the system operation, grasps the parallel operation state of the transformer, and the number exceeds the set number. It is determined whether it is over or less than the set number. Further, the determination unit 11 compares the tap values of the transformers (more precisely, the tap value of the on-load tap switching mechanism attached to the transformers) with each other when the number of transformers operated in parallel is less than the set number. If there is even one transformer with different tap values among the transformers that are operated in parallel, the determination that the tap values do not match is made.

  The output unit 13 receives the determination results of these determination units 11, and when the determination unit 11 determines that the number of transformers operated in parallel is excessive or the tap values of the transformers do not match, This is a part that outputs a lock command in response to the operation of the system components by the HMI unit 14 that is the basis of these determinations. The lock command output from the output unit 13 is introduced, for example, as a contact that does not electrically establish the operation circuit of the device. Further, the lock command may include an alarm for alerting an operator who wants to perform the operation.

[System configuration of substation]
Next, the system configuration of the substation to which the present apparatus is applied will be specifically described with reference to the single-line connection diagram of FIG. As shown in FIG. 2, buses 201 and 202 constituting the upper voltage class and buses 229 and 230 constituting the lower voltage class are arranged in the substation, and the disconnector 208, which is a system component device, is arranged on these buses. ˜215, 236˜243 and circuit breakers 221˜228 are connected.

  Furthermore, the circuit breakers 245, 246, 247, 248 for separating each bus to the left and right are installed in the buses 201, 202, 229, 230. That is, the bus 201 is separated into the buses 203 and 204 by the circuit breaker 245, the bus 202 is separated into the buses 203 and 204 by the circuit breaker 246, and the bus 229 is separated into the buses 231 and 232 by the circuit breaker 247. 230 is separated into buses 233 and 234 by a circuit breaker 248. Further, the bus 201 and the bus 202 on the higher voltage class side can be coupled by breakers 207 and 216 at both ends. Further, the bus 229 and the bus 230 on the lower voltage class side can be coupled by breakers 235 and 244 at both ends.

  In the substation shown in FIG. 2, buses 201 and 202 on the upper voltage class side and buses 229 and 230 on the lower voltage class side are coupled by four transformers 217 to 220. The transformers 217 to 220 are connected in parallel to the buses 201, 202, 229 and 230. Two circuit breakers are connected to each of the transformers 217 to 220.

  That is, the circuit breakers 221 and 225 are connected to the transformer 217, the circuit breakers 222 and 226 are connected to the transformer 218, the circuit breakers 223 and 227 are connected to the transformer 219, and the circuit breaker is disconnected from the transformer 220. Devices 224 and 228 are connected. Two disconnectors are connected to a total of eight circuit breakers 221 to 224 connected to these transformers 217 to 220, respectively. In other words, the upper voltage class disconnectors 208 to 215 are connected to the circuit breakers 221 to 224, and the lower voltage class disconnectors 236 to 243 are connected to the circuit breakers 225 to 228.

  Among the disconnectors 208 to 215 which are higher voltage classes, the disconnectors 208, 210, 212 and 214 are connected to the bus 201, and the disconnectors 209, 211, 213 and 215 are connected to the bus 202. At these disconnectors 208 to 215 and circuit breakers 221 to 224, transformers 217 to 220 are coupled to buses 201 and 209 of any upper voltage class.

  In addition, among the disconnectors 236 to 243, which are lower voltage classes, 236, 238, 240, and 242 are connected to the bus 229, and the disconnectors 237, 239, 241, and 243 are connected to the bus 230. These disconnectors 236 to 243 and circuit breakers 225 to 228 couple transformers 217 to 220 to buses 229 and 230 of an arbitrary lower voltage class.

[Parallel operation state of transformer]
The parallel operation state of the transformers at the substation as described above will be described with reference to FIG. In FIG. 3, three transformers 217 to 219 are operated in parallel. Among these, the transformer 217 is connected to the upper bus 202 because the disconnector 209 is on and the breaker 221 is on, and the lower bus 230 is connected because the disconnector 237 is on and the breaker 225 is on. It is connected to the.

  The transformer 218 is connected to the upper bus 202 because the disconnector 211 is in the on state and the breaker 222 is in the on state, the disconnector 239 is in the on state, and the breaker 226 is in the on state to the lower bus 230. It is connected. The transformer 219 is connected to the upper bus 202 with the disconnector 213 in the on state and the breaker 223 in the on state, and is connected to the lower bus 230 with the disconnector 241 in the on state and the breaker 227 in the on state. It is connected.

  Here, since the circuit breaker 246 for separating the bus 202 to the left and right is in the on state and the circuit breaker 248 for separating the bus 230 to the left and right is in the on state, as a result, the three transformers 217 to 219 have the same bus 202, 230. It is connected. Furthermore, the tap values (301 to 303) of the on-load tap switching operation mechanism attached to each of the transformers 217 to 219 are the same numbers as “5”. The above state is defined as a parallel operation state of the transformers 217, 218, and 219.

  On the other hand, in the transformer 220, the disconnector 214 is in the on state, the breaker 224 is in the on state on the upper side, the disconnector 242 is in the on state, and the breaker 228 is on in the lower side. Are connected to the bus bar 229, but the circuit breakers 245 and 247 for separating the bus bar 201 and the bus bar 229 to the left and right are in a cut-off state. For this reason, the transformer 220 is completely separated from the other transformers 217, 218, and 219. Therefore, in FIG. 3, the tap value of the transformer 220 is “8”, but the transformer 220 is not operated in parallel with the transformers 217, 218, and 219, and thus is not affected by the difference in tap values.

[Case where transformer tap value is different]
Next, the system configuration of the substation in two cases in which problems occur when the transformers are in parallel operation will be described. The system configuration of FIG. 4 shows a state where the tap values of the transformers that are operated in parallel and parallel are different. As shown in FIG. 4, the three transformers 217, 218, and 219 are connected to the same bus 202 and 230 and are operating in parallel. Among these, the tap values of the transformers 217 and 219 are both “5”. On the other hand, the tap value of the transformer 218 is “3”.

  In such a parallel operation state, a voltage difference is directed from the transformers 217 and 219 having a large tap value (high voltage conversion rate) toward the transformer 218 having a small tap value (low voltage conversion rate). Circulation currents 402 and 403 are generated due to the above. That is, the circulating currents 402 and 403 are added to the original passing current, and the respective transformers 217, 218, and 219 generate extra heat.

  As a result, the transformers 217, 218, and 219 may eventually be damaged by heat. In FIG. 4, the tap value of the transformer 220 is “8”. However, since the transformer 220 is not operated in parallel with the transformers 217, 218, and 219, There is no worry about the above effects.

[Case where the number of transformers operated in parallel exceeds the preset number]
Next, another case that causes a problem when the transformers are in parallel operation is when the number of transformers that are operated in parallel exceeds a preset maximum allowable number. The substation system configuration in this case will be described with reference to FIG. In the state of FIG. 5, the transformers 217, 218 and 219 are connected to the same buses 202 and 230 and are in a parallel operation state.

  As for the connection state of the transformer 220, the disconnector 215 is in the on state and the circuit breaker 224 is in the on state in the upper voltage class, and is connected to the bus 202 as in the other transformers 217, 218, and 219. On the other hand, the lower voltage class is connected to the bus 230 because the disconnector 243 is in the on state, but the parallel connection with the other transformers 217, 218, 219 is established because the breaker 228 is in the off state. The transformer 220 is not operating.

  When the set number (maximum allowable number) of transformers to be operated in parallel is three due to restrictions of the substation and the like, parallel operation has already been performed with three of the transformers 217 to 219. Therefore, in this state, if the circuit breaker 228 connected to the transformer 220 is turned on, the transformer 220 is also operated in parallel with the transformers 217 to 219 and exceeds the set three units.

[Processing flow 1: Parallel operation judgment]
Assuming that there are two cases where problems occur during the parallel operation state of the transformer as described above, the transformer parallel operation prevention device according to this embodiment performs the following processing flow. Yes. As shown in the flowchart of FIG. 6, first, the determination unit 11 determines whether the transformers in the substation are operated in parallel. That is, this process starts with the activation of the apparatus (S901), and thereafter basically loops periodically or some state change to a kick (S902, S906).

  Subsequently, it is determined whether or not the transformer parallel operation preventing apparatus itself according to the present embodiment has an abnormality (S903), and if the apparatus has an abnormality (Yes in S903), there is no point in continuing the determination process. Therefore, the process ends. If the transformer parallel operation prevention device is normal (No in S903), the process proceeds to a process of confirming the bus connection state of the transformer (S904). Then, the result data of the confirmed bus connection state of the transformer is stored in a predetermined memory (S905).

[Processing flow 2: Lock command output from number / tap value judgment]
Subsequently, the determination unit 11 determines whether or not the number of transformers to be operated in parallel is equal to or greater than the set number, and whether or not all the tap values of the transformers match even if the number is equal to or less than the set number. . In addition, if the determination result of the determination unit 11 exceeds the set number and does not match the tap value, receive this determination result. The output unit 13 outputs a lock command to a predetermined device.

  Processing of the lock command output from the above-described number / tap value determination will be described with reference to the flowchart of FIG. As shown in FIG. 7, the transformer parallel operation preventing apparatus according to the present embodiment is started periodically or with some state change as a kick (S10011), and checks all the devices installed in the substation. (S1002, S1017).

  Here, as in the processing flow of FIG. 6, it is determined whether or not the transformer parallel operation preventing device itself has an abnormality (S1003). If there is an abnormality (Yes in S1003), the determination process is continued. Because there is no more, it ends. Next, the devices constituting the substation system are selected one by one (S1004).

  It is confirmed whether or not the selected device is mounted (S1005), and further whether or not the device is off (S1007). When the device is not mounted (No in S1005) or in the on state (No in S1007), since there is no meaning to determine, the process of selecting the next device is executed (S1006, the next in FIG. 8). Example of checking a circuit breaker), the process returns to S1003.

  When the selected device is mounted (Yes in S1005) and in the off state (Yes in S1007), it is assumed that the device has been turned on, and what happens to the parallel operation state of the transformers? The process to simulate is entered (S1008). First, the connection data to the bus of the transformer stored in the memory at the end of the process shown in FIG. 7 is acquired (S1009), and the substation system state becomes parallel operation when it is assumed that the device is inserted. The determination unit 11 determines whether or not this will occur (S1010). If the determination unit 11 determines that the transformer does not operate in parallel when the device is inserted (No in S1010), the output unit 13 does not output a lock command (S1014).

  On the other hand, when the determination unit 11 determines that the transformer is operated in parallel when the device is inserted (Yes in S1010), the process proceeds to S1011. In S1011, the determination unit 11 determines whether or not the number of transformers in parallel operation exceeds the set maximum number of parallel operations. As a premise of such determination, the determination unit 11 grasps the substation system state and the connection state of the transformer based on the on / off state of the system component device indicated by the contact information. A logic expression is used as a method for grasping the on / off state.

Here, the logic formula will be described with reference to Tables 1 and 2. Table 1 is a parallel operation determination table for three transformers on the upper voltage class (here, 400 kV) side, and Table 2 is an operation determination table for three transformers on the lower voltage class (here, 132 kV) side.

  The transformer parallel strip operation judgment table shown in Tables 1 and 2 is defined by using AND and OR logic expressions for all patterns of the on / off state of the equipment. Set to. Based on the contact information acquired from the input unit 12 and the information operated / set by the HMI unit 14, the determination unit 11 checks which pattern is applicable to the on / off state of the system component device. Thus, the number of operating transformers that are operated in parallel is determined.

  Applying the examples of the logic equations shown in Tables 1 and 2 to the system in which the number of transformers operated in parallel shown in FIG. 5 is exceeded, No. 19 in Table 1 and No. 19 in Table 2 Since the disconnectors 209, 211, 213, 237, 239, 241 and the circuit breakers 246, 248 are in the on state according to the logic formula, it is determined that the three transformers 217 to 219 have already been operated in parallel. 11 judges.

  In this state, when the maximum allowable number of transformers to be operated in parallel is set to 3, when the circuit breaker 228 is selected in S1004 as an example, if the circuit breaker 228 is turned on, the transformer 220 is The transformers 217 to 219 are operated in parallel. That is, the number of transformers operated in parallel is four, and the determination unit 11 determines that the number of transformers operated in parallel exceeds the set number (No in S1011). The determination unit 11 sends such a determination result to the output unit 13.

  In response to the determination result of the determination unit 11, the output unit 13 outputs a lock command for the closing operation to the device selected in S1004, here, the circuit breaker 228 assuming the closing operation (S1016). By the output of this lock command, the closing operation of the circuit breaker 228 connected to the transformer 220 is locked. As a result, even if the operator performs an operation to turn on the circuit breaker 228, the turning operation becomes invalid, and it is possible to reliably avoid the transformer 220 from being operated in parallel with the transformers 217 to 219.

  Here, the lock command from the output unit 13 is for preventing the transformer 220 from being connected to the bus 202 and the bus 230. Therefore, the determination unit 11 needs to create all the system conditions that can be considered when four transformers are operated in parallel in the same manner as in Tables 1 and 2 with respect to preventing connection of the transformer 220. . In this way, the determination unit 11 grasps a device that is a failure condition of a transformer that is operated in parallel, so that the output unit 13 can output a lock command for a closing operation for the device. The above is the processing when the number of transformers operated in parallel exceeds the set number.

  On the other hand, if the determination unit 11 determines that the number of transformers that are operated in parallel falls within three or less of the set number even when the device selected in S1004 is turned on, the determination unit 11 continues. Compares whether the tap values of the transformers operated in parallel match each other (S1012). Here, if all the tap values of the transformers operated in parallel match with each other, when the determination unit 11 determines (Yes in S1013), the output unit 13 does not output a lock command (S1014).

  On the other hand, when the determination unit 11 determines that the tap values of the transformers operated in parallel do not match (No in S1013), the output unit 13 receives the result to the device selected in S1004. An operation lock command is output (S1016). Taking the system shown in FIG. 4 as an example, when the transformer 218 with the tap value “3” is operated in parallel with the transformers 217 and 219 with the tap value “5”, the tap values do not match.

  Therefore, if the circuit breaker 222 or 226 connected to the transformer 218 is selected in S1004, the determination unit 11 determines that the tap values do not match. The output unit 13 that has received the determination result from the determination unit 11 outputs a lock command to the circuit breaker 222 or 226.

  As a result, even if the operator performs the closing operation of the circuit breaker 222 or 226, the closing operation becomes invalid, and the transformer 218 having the tap value “3” is replaced by the transformer 217 having the tap value “5”. 219 is not operated in parallel. Finally, it is determined whether all the devices constituting the substation have been checked (S1015). If there are remaining unchecked devices, a loop (S1017) is performed, and once the checked devices are exhausted, The process ends.

[Function and effect]
As described above, according to the first embodiment, when a device for performing a closing operation is selected for a device in a cut-off state, transformers having different tap values are operated in parallel by the operation of the device. If it is determined that the transformers are operated in parallel exceeding the set number, the lock command for the closing operation can be automatically output to the device.

  Therefore, it is possible to lock the input operation to the selected device, and it is possible to reliably prevent the parallel operation of the transformer that may cause a malfunction. As described above, in the prior art, when performing system operation, a confirmation operation such as whether transformers having different tap values are not operated in parallel or whether more than a set number of transformers are operated in parallel is performed for each human operation. There is a possibility of human error.

  Therefore, in the present embodiment, the determination unit 11 grasps the operating state of the transformer based on the contact information of the system component devices. Therefore, as long as the maximum allowable number of transformers is set in the HMI unit 14, the determination unit 11 can determine the equipment that causes the parallel operation of the transformer exceeding the set number without leaving to human judgment. It is.

  Whether or not the transformers with different tap values are operated in parallel does not have to wait for the determination of the human system at the time of selecting the device to be operated, and the determination unit 11 immediately determines this. Can do. That is, in the first embodiment, the determination unit 11 determines the operating state of the transformer, so that a confirmation error due to a human system can be accurately eliminated.

  Then, if the determination unit 11 determines that the number of transformers operated in parallel or the tap value mismatch occurs when the operator selects the device selected, the output unit 13 receives the determination and performs the operation. Outputs a lock command. Therefore, even if an operation error occurs, parallel operation of transformers exceeding the set number or parallel operation of transformers having different tap values can be reliably prevented.

  According to the transformer parallel operation preventing apparatus as described above, stable parallel operation of transformers can be performed even if the number of transformers is increased in order to increase the amount of energy handled at the substation. Therefore, it is suitable for a transformer with a large number of transformers, and can contribute to improving the reliability of the substation. In addition, when outputting the system operation lock command at the output unit 13, if an alarm or a display of the alarm content is output, the operator can be alerted. Therefore, it is possible to suppress human system judgment errors and operation errors.

(2) Second Embodiment [Configuration]
Next, a transformer parallel operation preventing apparatus according to the second embodiment will be described. The second embodiment is characterized by processing for grasping the state of the substation system and the connection state of the transformer, and the basic configuration is the same as that of the first embodiment.

  The determination unit 11 according to the second embodiment is characterized in that a topology method is employed as a method for grasping and processing the on / off state of the system component devices. The principle of this topology method will be specifically described with reference to FIGS. 8 and 9 are examples of a substation system for explaining the topology method.

  The buses 201, 202, 229, and 230, which are the basics of the substation system, are divided into left and right by intermediate circuit breakers 245, 246, 247, and 248. The buses 203 and 204, the buses 205 and 206, and the buses 231 and 231 respectively. 232 and buses 233 and 234. In this state, a phase number (number surrounded by a dotted circle in FIGS. 8 and 9) is assigned to each of the divided buses to make an initial state.

  In the example shown in FIG. 8, the phase number 1 is on the bus 203, the phase number 3 is on the bus 204, the phase number 2 is on the bus 205, the phase number 4 is on the bus 206, and the phase number is on the bus 231. 10, the bus 232 is assigned the phase number 30, the bus 233 is assigned the phase number 20, and the bus 234 is assigned the phase number 40.

  Based on this, it is checked which bus is connected to the transformer according to the on / off status of the devices that make up the actual substation system. And the parallel state of a transformer is confirmed by allocating the setting number of the connected bus to a transformer. In the topology method, the connection state of the transformer can be grasped as described above.

  Next, a normal operation when the determination unit 11 adopts the topology determination method will be described with reference to FIG. In the example shown in FIG. 9, the circuit breaker 246 that divides the bus 202 into left and right is in an on state. Therefore, the phase numbers of the bus 205 and the bus 206 are the same. Here, the younger phase number is given priority. Therefore, the phase number 2 on the bus 205 side is also applied to the bus 206 side. That is, the phase number of the bus 206 is 2 instead of 4. Similarly, since the circuit breaker 248 that divides the bus 230 into left and right is in the on state, the phase numbers of the bus 233 and the bus 234 are the same. At this time, since the younger phase number is prioritized, the phase number 20 on the bus 233 side is also applied to the bus 234 side, and the phase number of the bus 234 is changed from 40 to 20.

  Next, the connection state of each transformer is confirmed, and the phase number of the transformer is assigned. In the upper voltage class, the disconnector 208 is in the disconnected state, the disconnector 209 and the breaker 221 are in the on state, the disconnector 210 is in the disconnected state, and the disconnector 211 and the breaker 222 are in the on state. For this reason, the transformers 217 and 218 are both connected to the bus 205 side, and the phase number in the upper voltage class is 2. Moreover, since the disconnector 212 is in a disconnected state and the disconnector 213 and the circuit breaker 223 are in an on state, the transformer 219 is connected to the bus 206 side. Therefore, the phase number in the upper voltage class of the transformer 219 is also 2.

  On the other hand, since the circuit breaker 245 that divides the bus 201 into the left and right is in a cut-off state, the phase numbers of the bus 203 and the bus 204 remain in the initial state, the former phase number is 1, and the latter phase number is 3. At this time, since the disconnector 214 and the circuit breaker 224 are in the on state and the disconnector 215 is in the off state, the transformer 220 is connected to the bus 204 side and its phase number is 3.

  On the other hand, in the lower voltage class, since the disconnector 236 is in the disconnected state and the disconnector 237 and the breaker 225 are in the on state, the transformer 217 is connected to the bus 233 side and the phase number is 20. Further, since the disconnector 238 is in the disconnected state and the disconnector 239 and the breaker 226 are in the on state, the transformer 218 is connected to the bus 233 side, and the phase number is also 20. Furthermore, since the disconnector 240 is in the disconnected state and the disconnector 241 and the circuit breaker 227 are in the on state, the transformer 219 is connected to the bus 234 side, and therefore the phase number of the transformer 219 is also 20.

  On the other hand, since the circuit breaker 247 that divides the bus 229 into left and right is in the cut state, the phase numbers of the bus 231 and the bus 232 remain in the initial state, the former phase number is 10, and the latter phase number is 30. is there. At this time, since the disconnector 242 and the circuit breaker 228 are in the on state and the disconnector 243 is in the off state, the transformer 220 is connected to the bus 232 side. For this reason, the phase number of the transformer 220 is 30.

  In the above topology method, it is finally determined whether or not the transformers are operating in parallel depending on whether the values obtained by adding the numbers of the phase numbers of the upper voltage class and the lower voltage class match. That is, since the total value of the phase numbers of the transformers 217 to 219 is 2 + 20 = 22, the determination unit 11 determines that these three transformers are operated in parallel. On the other hand, the total value of the phase numbers of the transformer 220 is 3 + 30 = 33, and the determination unit 11 determines that the transformers 217 to 219 whose total number of phase numbers is 22 are not operated in parallel.

  By determining the total value of the phase numbers as described above, the determination unit 11 of the second embodiment can determine the number of transformers that are operated in parallel. Here, when the number of set units is 3 and the number of determined transformers is 3, when selecting a device in which the total value of the phase numbers of the transformer 220 is 22, the first implementation described above. Similar to the configuration, the output unit 13 outputs a lock command to the device. Thereby, the increase in the number of the transformers operated in parallel can be suppressed.

[Function and effect]
The second embodiment has the following unique operational effects in addition to the operational effects of the first embodiment. That is, in the second embodiment, by adopting the topology method when determining the transformers to be operated in parallel, it is only necessary to set the phase number of the device and the initial bus, and the transformer based on the on / off state of the device. It is possible to grasp the parallel operation state.

  That is, since the determination unit 11 according to the first embodiment uses a logic equation, it is indispensable to previously logicize the parallel operation conditions of the transformers in the substation. Therefore, every time the system condition is changed, it is necessary to review the logic expression set in the determination unit 11. On the other hand, in the second embodiment, all the system states of the parallel operation conditions are not expressed as logic expressions in the first place, so that even if the system conditions are changed, it is not necessary to change the logic expression in the determination unit 11. Yes, it can demonstrate excellent maintainability.

(3) Third Embodiment [Configuration]
Hereinafter, the third embodiment will be specifically described with reference to FIG. The third embodiment is a substation monitoring and control system 10 using the transformer parallel operation prevention device 1, and as shown in FIG. 10, the transformer parallel operation prevention device 1, the transmission line 16, and the substation. And n line terminals 181 to 18n for interfacing with the equipment 17 of the substation. Note that the substation equipment 17 includes disconnectors and circuit breakers, which are system components of the substation illustrated in FIG. 2 and the like, and further a transformer.

  The transformer parallel operation preventing apparatus 1 according to the third embodiment is characterized in that a communication unit 15 is provided in addition to the determination unit 11, the output unit 13, and the HMI unit 14 described in FIG. The HMI unit 14 and the communication unit 15 on the transformer parallel operation preventing device 1 side are coupled to the transmission line 16. In addition, line terminals 181 to 18n of the substation equipment 17 are coupled to the transmission line 16. The information flowing on the transmission line 16 includes various information of the substation equipment 17 such as the on / off state of each equipment and the tap value of the transformer, and these are the transmission data on the side of the transformer parallel operation preventing apparatus 1 side. It is sent to the communication unit 15.

  In the third embodiment, an operation command to the substation equipment 17 implemented by the HMI unit 14 is transmitted as operation data to the line terminals 181 to 18n via the transmission line 16. The line terminals 181 to 18n are configured to output the received operation data to the substation equipment 17. A predetermined operation is performed at the substation equipment 17 based on operation data from the line terminals 181 to 18n.

[Function and effect]
In 3rd Embodiment which has such a structure, the communication part 15 makes various information (the on / off state of each device, the tap value of the transformer) of the device 17 of the substation flowing on the transmission line 16, It can be taken into the transformer parallel operation prevention device 1 side as transmission data.

  Then, the communication unit 15 sends the transmission data to the determination unit 11. Therefore, as in the first and second embodiments, the determination unit 11 grasps the operating state of the transformer, and in accordance with the determination of the determination unit 11, an operation lock command for the substation equipment 17 (for example, a circuit breaker). Can be output from the output unit 13 as a contact.

  According to the third embodiment as described above, the input unit 12 of the transformer parallel operation preventing apparatus 1 shown in FIG. 1 can be omitted. Therefore, simplification of the transformer parallel operation preventing device 1 can be promoted. Moreover, the cable which connects the input part 12 and the apparatus 17 of a substation becomes unnecessary, and can reduce the number of cables. Therefore, it can also contribute to simplification of the substation monitoring and control system 10 as a whole.

(4) Fourth Embodiment [Configuration]
Next, the substation monitoring and control system 10 according to the fourth embodiment will be specifically described with reference to FIG. As shown in FIG. 11, the basic configuration of the fourth embodiment is the same as that of the third embodiment. However, in the fourth embodiment, the output unit 13 on the transformer parallel operation preventing device 1 side is omitted. A feature is that a lock command is output using the line terminals 181 to 18n.

  That is, the determination unit 11 on the transformer parallel operation preventing device 1 side outputs the determination result to the line terminals 181 to 18n via the transmission line 16. The line terminals 181 to 18n receive the determination result of the determination unit 11 and output a lock command to the substation equipment 17 connected to the line terminals 181 to 18n.

  Also in the fourth embodiment, the operation command to the substation equipment 17 implemented by the HMI unit 14 is transmitted as operation data to the line terminals 181 to 18n via the transmission line 16. The line terminals 181 to 18n output the received operation data to the substation equipment 17, and the substation equipment 17 performs a predetermined operation based on the operation data.

[Function and effect]
In the fourth embodiment having the above configuration, since the transformer parallel operation preventing device 1 is connected to the transmission line 16 via the communication unit 15, the device operation lock command is sent to the HMI via the transmission line 16. It can be transmitted to the unit 14 or transmitted to the line terminals 181 to 18n.

  That is, according to the fourth embodiment, the input of the system information and the output of the operation lock command can be exchanged via the communication unit 15, and the input unit 12 and the output unit 13 are not necessary. Therefore, it is possible to further simplify the configuration of the transformer parallel operation preventing device 1. In addition, a cable between the output unit 13 and the substation equipment 17 is not necessary, and the number of cables in the system can be further reduced.

(5) Other Embodiments In the transformer parallel operation preventing apparatus described above, it is possible to grasp the substation system, thereby preventing transformer parallel operation exceeding the set number, and transformers having different tap values. Prevents parallel operation.

  In order to prevent transformer operation, a lock command that locks the operation command of the device is output.If the lock command can be output, other commands can be output using this output function. is there. That is, when a transformer operated in parallel is disconnected from parallel due to a system fault or operation, it is possible to output an operation command for operating other sound and independent operation transformers in parallel.

  Here, a transformer parallel operation preventing apparatus configured to output an operation command when parallel operated transformers are disconnected will be described with reference to FIGS. FIG. 12 is an example of the initial state of substation operation. In this figure, the transformers 217, 218, 219 all have the same tap value and are operated in parallel via the buses 202, 230.

  The transformer 220 is in a stopped state because the circuit breaker 228 is off. The tap value of the transformer 220 is “8”. From the state shown in FIG. 12, when a system fault occurs in the transformer 219 as shown in FIG. 13, the circuit breakers 223 and 227 are turned off, and the transformer 219 is stopped.

  Therefore, there are two transformers 217 and 218 that are operated in parallel, and the energy that can be transmitted from the bus 202 to the bus 230 is naturally reduced. Therefore, in order to compensate for this, the output unit 13 of the transformer parallel operation prevention device 1 replaces the transformer 220 that has stopped with the bus 202 based on the fact that the number of transformers in parallel operation before the occurrence of the accident was three. , 230 is operated to output an operation command.

  Specifically, the transformer 220 is connected to the bus 202 on the higher voltage class side by turning off the disconnector 214, turning on the disconnector 215, and turning on the breaker 224. The disconnector 242 is turned off and the disconnector 243 is turned on. However, in the state shown in FIG. 13, the circuit breaker 228 is not included, the transformer 220 is not connected to the bus 202 on the lower voltage class side, and the transformer 220 is still stopped.

  Therefore, the output unit 13 of the transformer parallel operation preventing apparatus 1 outputs a command for resetting the tap value to the transformer 220. Based on this command, the transformer 220 operates the tap to set the tap value to “8”. To “5” which is the same as the other transformers 217 and 218. After that, as shown in FIG. 14, the circuit breaker 228 is turned on, and finally, three units of the transformers 217, 218, and 220 are operated in parallel. As a result, the energy transmitted from the bus 202 to the bus 230 can be recovered.

  According to such another embodiment, when the number of transformers in parallel operation is reduced due to a grid fault or operation at a substation, other transformers can be automatically added to parallel operation. it can. Thereby, stable energy supply is always possible without depending on the operation by the human system.

DESCRIPTION OF SYMBOLS 1 ... Transformer parallel operation prevention apparatus 10 ... Substation monitoring control system 11 ... Determination part 12 ... Input part 13 ... Output part 14 ... HMI part 15 ... Communication part 16 ... Transmission path 17 ... Substation equipment 181-18n ... Line Terminals 201-206, 229-234 ... Busbars 207, 216, 221-228, 235, 244 ... Breakers 208-215, 236-243 ... Disconnectors 217-220 ... Transformers

Claims (8)

A plurality of substation systems having different voltage classes are provided, and the substation system is composed of a bus and a system component device including a disconnector and a circuit breaker, and the substation systems having different voltage classes are coupled by a transformer, In a substation where the transformers are connected in parallel,
As input data for determining the state of the substation system and the connection state of the transformer, input means for inputting contact information representing the on / off state of the system component equipment,
Interface means for implementing an interface with an operator who performs on / off operation of the system component device;
Assuming that an operator operates any of the system components in the interface means, the number of transformers operated in parallel with the operation exceeds the preset number or is set Determination means for determining whether the number is less than the number based on the contact information input by the input means;
A transformer parallel operation preventing apparatus, comprising: an output unit that outputs a lock command for the operation when the determination unit determines that the number of units is exceeded. The input means is configured to input a tap value from a load tap switching mechanism attached to the transformer,
The determination means is configured to determine whether the tap values of the transformers match based on the tap value input by the input means,
Assuming that an operator operates any of the system components in the interface means, the number of transformers operated in parallel is equal to or less than the set number, but the tap values of the transformers do not match. 2. The transformer parallel operation preventing apparatus according to claim 1, wherein when the determination means determines, the output means outputs a lock command for the operation.   When the parallel operation state of the transformers that have been operated in parallel is canceled, the output means is configured to output an operation command that causes a healthy and isolated operation of the transformer to participate in parallel operation. The transformer parallel operation prevention device according to claim 1 or 2, characterized by the above.   The determination unit is configured to preliminarily define a pattern of an on / off state of the system component device using a logic expression, and to execute a determination process using the pattern. The transformer parallel operation preventing device according to any one of?   The determination means preliminarily assigns an identification number to the bus, and performs a determination process by a topology method that determines the number of transformers operated in parallel depending on which identification number the transformer is connected to the bus. It is comprised so that it may perform, The transformer parallel operation prevention apparatus of any one of Claims 1-3 characterized by the above-mentioned.   The transformer parallel according to any one of claims 1 to 5, wherein the output means is configured to output an alarm for alerting an operator separately from the lock command. Driving prevention device. A substation monitoring and control system using the transformer parallel operation preventing device according to claim 1,
In the substation monitoring and control system, a line terminal that implements an interface with system components of the substation and an interface means that implements an interface with an operator are coupled by a transmission line.
Various information possessed by the system component equipment is passed through the transmission path as transmission data,
The transformer parallel operation preventing device is provided with communication means connected to the transmission path,
The substation monitoring and control system, wherein the communication means is configured to take in various pieces of information of substation equipment flowing on the transmission path as transmission data. The determination means is connected to the communication means,
The communication means is configured to transmit the determination result of the determination means to the interface means or the line terminal via the transmission path,
The substation monitoring and control system according to claim 7, wherein the interface unit or the line terminal is configured to be able to output an operation lock command to equipment constituting the substation.

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