Feeding voltage control system and feeding voltage control method

Abstract

The feeding voltage control system controls a feeding voltage for trains traveling on a route, in order to adjust a delivery voltage from a substation without being affected by a delay or the like of a train diagram, and to achieve stable transportation and energy saving due to regenerative effectiveness. The system is provided with: a route power state determination unit that, on the basis of a voltage-power relationship diagram indicating the relationship between the train voltage and the train power of trains that have traveled on a route, and on train voltage information and train power information obtained from each train traveling on the route, determines the current power state of the route; and an adjustment unit that adjusts, on the basis of the current power state of the route determined by the route power state determination unit, the delivery voltage from the substation that supplies power to the route.

Description

Feeder voltage control system and feeding voltage control method

[0001] The present invention relates to a feeding voltage control system and a feeding voltage control method for controlling a substation voltage.

[0002] Railway systems are required to provide stable transportation without delays and to be energy-efficient. As a method for achieving this, for example, the following two methods are disclosed in prior art documents.

[0003] First, Patent Document 1 discloses the following method: A simulation is performed using historical information for each train (historical information related to date and time, location, power, events, etc.), the location and power obtained from the historical information, and a circuit model required for power feeding calculations, and the sending voltage from the substation that minimizes power consumption is calculated in advance. Then, based on the date and time, location, power, and events on the relevant date and time obtained from the train, the corresponding historical information is searched for, and the sending voltage from the substation set in the searched historical information is set.

[0004] Furthermore, Patent Document 2 discloses the following method: A train behavior is predicted based on train position and train power information, and the prediction accuracy is calculated, and a voltage command fluctuation range is determined based on the prediction accuracy. At the same time, the train position, train power, and circuit constants and train models required for feeder calculations are used to solve an electric circuit with the determined voltage command fluctuation range as a constraint, thereby setting the voltage sent from the substation.

[0005] International Publication No. 2018 / 225194 Japanese Patent Application Laid-Open No. 2019-188887

[0006] The technology disclosed in Patent Document 1 cannot respond to cases where there is no data related to the relevant event. For example, if a delay occurs, the position and power are different from normal, making it impossible to adjust the voltage. Furthermore, even if a similar situation is used, the situation is not necessarily the same, so there is a possibility that regeneration cancellation will occur.

[0007] Furthermore, with regard to the technology disclosed in Patent Document 2, prediction of train behavior is based on the assumption that the timetable is fixed, and therefore, in cases where the timetable changes due to delays or other reasons, the accuracy of the prediction is likely to drop significantly.

[0008] Therefore, an object of the present invention is to provide a technology for adjusting the voltage sent from a substation based on the current power status of the line without being affected by delays in train schedules, etc.

[0009] In order to solve the above problems, one representative feeder voltage control system of the present invention is a feeder voltage control system that controls the feeder voltage for trains traveling on a line, and is equipped with a line power state determination unit that determines the current power state of the line based on a voltage-power relationship diagram that shows the relationship between the train voltage and train power of trains that have traveled on the line and train voltage information and train power information obtained from each train traveling on the line, and an adjustment unit that adjusts the sending voltage from the substation that supplies power to the line based on the current power state of the line determined by the line power state determination unit.

[0010] According to the present invention, stable transportation and energy savings due to regeneration can be achieved by setting the sending voltage of the substation to an appropriate value for the line based on data related to the running vehicles, without being affected by delays in the train schedule, etc. Problems, configurations, and effects other than those described above will become clear from the description of the following embodiments.

[0011] 1 is a diagram showing an example of the configuration of a feeding voltage control system of Example 1. FIG. 2 is a diagram showing an example of the configuration of a voltage control system. FIG. 3 is a graph showing an example of a voltage-power relationship diagram. FIG. 4 is a diagram showing an example of the characteristics of a high-voltage limiter. FIG. 5 is a diagram showing an example of the characteristics of a low-voltage limiter. FIG. 6 is a diagram showing an example of the configuration of a line power state determination unit. FIG. 7 is a diagram showing an example of a flowchart of processing executed by each train state determination unit. FIG. 8 is a table showing line power states according to majority vote states. FIG. 9 is a diagram showing an example of the configuration of a feeding voltage control system of Example 2. FIG. 10 is a diagram showing an example of the configuration of a voltage control system. FIG. 11 is a diagram showing an example of the configuration of a substation section state determination unit. FIG. 12 is a diagram showing an example of data stored in a substation location table. FIG. 13 is a diagram showing an example of the configuration of a feeding voltage control system of Example 1. FIG. 14 is a diagram showing an example of the configuration of a voltage control system. FIG. 15 is a diagram showing an example of the configuration of a line power state determination unit. FIG. 16 is a diagram showing an example of a flowchart of processing executed by each train voltage adjustment width calculation unit.

[0012] Hereinafter, with reference to the drawings, a first to third embodiments of the present invention will be described as embodiments for carrying out the present invention. Note that the present invention is not limited to these embodiments. In addition, in the drawings, the same parts are denoted by the same reference numerals.

[0013] 1 is a diagram showing an example of the configuration of a feeding voltage control system according to a first embodiment of the present invention. Substations 103A and 103B supply power to trains 101A, 101B, and 101C through an overhead line 102.

[0014] The feeding voltage control system 104 determines sending voltages 152A and 152B of the substations 103A and 103B, respectively, based on voltage and power information 151A, 151B, and 151C of the trains 101A, 101B, and 101C, respectively.

[0015] 1, the number of trains is shown as three and the number of substations as two, but this is not limited to these. In the following description, trains 101A, 101B, and 101C may be collectively referred to as train 101, substations 103A and 103B may be collectively referred to as substation 103, voltage and power information 151A, 151B, and 151C may be collectively referred to as voltage and power information 151, and sending voltages 152A and 152B may be collectively referred to as sending voltage 152.

[0016] 2 is a diagram showing an example of the configuration of the feeding voltage control system 104. The feeding voltage control system 104 is composed of a voltage-power relationship creation unit 201 that receives past information on voltage and power 151 from the train 101 as input and outputs a voltage-power relationship diagram 251, a line power state determination unit 202 that receives the voltage and power information 151 and the voltage-power relationship diagram 251 as input and determines and outputs a line power state 252, and a sending voltage adjustment unit 203 that receives the line power state 252 as input and determines and outputs a substation sending voltage 152. Here, the line power state 252 has three modes: excessive powering, excessive regeneration, and a balanced state.

[0017] 3 is a graph showing an example of the voltage-power relationship diagram 251. In Fig. 3, the horizontal axis represents train power, the vertical axis represents train voltage, and the horizontal axis represents train power, with traction power being positive and regenerative power being negative. Each dot represents past voltage and power information 151 for each train.

[0018] When the voltage-power relationship diagram 251 is created in this way, the relationship between train power and train voltage tends to slope downward to the right, since current flows from high voltage to low voltage. Also shown in Figure 3 are region boundary line 1 (301), region boundary line 2 (302), high voltage limiter start voltage, and low voltage limiter start voltage. Each of these will be explained below.

[0019] The following describes region boundary line 1 and region boundary line 2. Region boundary line 1 is a line used to determine whether the train's power state is excessively regenerative, and is calculated, for example, using the following method. A gradient R is calculated using the least squares method based on the cloud of points shown in Figure 3, with the horizontal axis representing train power and the vertical axis representing train voltage. Using the calculated gradient R, a straight line passing through the cloud of points formed by the high-voltage limiter start voltage and the maximum regenerative power is created as region boundary line 1.

[0020] On the other hand, region boundary line 2 is a line used to determine whether the train's power state is excessively powered, and is calculated, for example, by the following method. A straight line passing through the group of points formed by the low voltage limiter start voltage and the maximum power running power with the above-mentioned gradient R is created as region boundary line 2. Here, the voltage-power relationship diagram divided into zones by region boundary line 1 and region boundary line 2 is referred to as the "power judgment map."

[0021] 4 is a diagram showing an example of the characteristics of a high-voltage limiter. The high-voltage limiter, with train voltage on the horizontal axis and regenerative current on the vertical axis, allows regeneration with the maximum regenerative current up to the high-voltage limiter start voltage relative to the train voltage, and the regenerative current becomes zero at a high-voltage limiter end voltage that is equal to or greater than the high-voltage limiter start voltage. This means that the regenerative current is throttled down when the train voltage exceeds the high-voltage limiter start voltage.

[0022] 5 is a diagram showing an example of the characteristics of the low-voltage limiter. The low-voltage limiter has characteristics with the horizontal axis representing the train voltage and the vertical axis representing the powering current. For the train voltage, powering is possible with the maximum powering current from the high voltage to the low-voltage limiter start voltage, and the powering current becomes zero at the low-voltage limiter end voltage, which is equal to or lower than the low-voltage limiter start voltage. This means that the powering current is reduced when the train voltage becomes lower than the low-voltage limiter start voltage.

[0023] 6 is a diagram showing an example of the configuration of the line power state determination unit 202. The line power state determination unit 202 is composed of an individual train state determination unit 601 that receives voltage and power information 151 and a voltage-power relationship diagram 251 as input, determines a train power state 651 (hereinafter abbreviated as "train power state 651") for each train, and outputs the determined train power state, and a power state determination unit 602 that receives the train power state 651 as input, and determines a line power state 252 and outputs the determined line power state.

[0024] 7 is a diagram showing an example of a flowchart of the processing executed by each train state determination unit 601. The processing entity of each processing step is each train state determination unit 601, but the description of that entity will be omitted below.

[0025] In step 701 (S701), it is determined whether the train power and train voltage indicated by the voltage and power information 151 are above the area boundary line 1 in the voltage-power relationship diagram 251 shown in Fig. 3. If the answer is Yes, the process proceeds to step 702 (S702). If the answer is No, the process proceeds to step 703 (S703).

[0026] In step 702 (S702), the train power state 651 is determined to be excessively regenerated, and the process ends. In step 703 (S703), it is determined whether the train power and train voltage indicated by the voltage and power information 151 are above the region boundary line 2 in the voltage-power relationship diagram 251 shown in Figure 3. If the answer is Yes, the process proceeds to step 704 (S704). If the answer is No, the process proceeds to step 705 (S705).

[0027] In step 704 (S704), the train power state 651 is determined to be in a balanced state, and the process ends. In step 705 (S705), the train power state 651 is determined to be in an excessive powering state, and the process ends.

[0028] Next, we will explain the operation of the power state determination unit 602. There are as many train power states 651 as there are trains on the line. Therefore, it is necessary to determine the line power state 252 after taking all of the train power states 651 into consideration.

[0029] If all train power states 651 are the same, the line power state 252 is also set to the same state. If the train power states 651 are different, the line power state 252 is determined taking into consideration the priority of the line. For example, during rush hour, if the train power states 651 include excessive powering, a method can be considered in which excessive powering is given priority as the line power state 252 in order to reduce the impact on punctuality.

[0030] Alternatively, there is a method of determining the line power state 252 by majority vote. FIG. 8 is a table showing the line power state 252 according to the state of majority vote. When determining by majority vote, if there is only one state of majority vote, that state can be used. On the other hand, if multiple candidates are obtained, for example, the following can be done. If there is excessive powering and a balanced state, adjustment is made as excessive powering. If there is excessive regeneration and a balanced state, adjustment is made as excessive regeneration. In all other cases, since excessive powering and excessive regeneration coexist, and changing to either state would affect energy conservation, punctuality, etc., adjustment is made as a balanced state.

[0031] Next, a description will be given of the operation of the sending voltage adjustment unit 203. The sending voltage adjustment unit 203 adjusts the substation sending voltage 152 based on the line power state 252 output from the power state determination unit 602 included in the line power state determination unit 202.

[0032] If the line power state 252 is a balanced state, the substation sending voltage 152 is not changed. If the line power state 252 is excessive powering, the line voltage is considered to be low, so the substation sending voltage 152 is increased by +α [V]. If the line power state 252 is excessive regeneration, the line voltage is considered to be high, so the substation sending voltage 152 is decreased by β [V].

[0033] Here, any numerical values ​​may be used for the values ​​α and β. However, depending on the substation equipment, the voltage range that can be changed may be limited. For example, in a substation configured with a general rectifier, the sending voltage of the substation can only be controlled by switching the tap on the receiving side of the substation. Furthermore, the voltage range will be a relatively large value, such as 30 V, for a DC 1500 V line. In such cases, control is performed using the voltage change range.

[0034] As a result, it is possible to determine the voltage sent from the substation taking into account the line power status. By using this sending voltage for control, it is possible to contribute to improving punctuality by making effective use of regeneration and avoiding low voltage conditions.

[0035] 9 is a diagram showing an example of the configuration of a feeding voltage control system according to a second embodiment of the present invention. Substations 103A and 103B supply power to trains 101A, 101B, and 101C through an overhead line 102.

[0036] The feeding voltage control system 901 determines the sending voltages 152A and 152B of the substations 103A and 103B, respectively, based on the voltage and power information 151A, 151B and 151C of the trains 101A, 101B and 101C, respectively, and the train positions 951A, 951B and 951C, respectively.

[0037] 9, the number of trains is shown as 3 and the number of substations is shown as 2, but the numbers are not limited to these. In the following description, train positions 951A, 951B, and 951C may be collectively referred to as train position 951.

[0038] 10 is a diagram showing an example of the configuration of a feeding voltage control system 901. The feeding voltage control system 901 is made up of a voltage-power relationship creation unit 201 that receives as input past information on voltage and power 151 from a train 101 and outputs a voltage-power relationship diagram 251, a substation section state determination unit 1001 that receives as input the voltage and power information 151 from the train 101, a train position 951, and the voltage-power relationship diagram 251 and determines and outputs a line power state 252 and a regulating substation 1051, and a substation sending voltage adjustment unit 1002 that receives as input the line power state 252 and the regulating substation 1051 and determines and outputs a substation sending voltage 152.

[0039] 11 is a diagram showing an example of the configuration of the substation section state determination unit 1001. The substation section state determination unit 1001 is composed of: each train state determination unit 601 that receives voltage and power information 151 and a voltage-power relationship diagram 251 as input and determines and outputs a train power state 651; a power state determination unit 602 that receives the train power state 651 as input and determines and outputs a line power state 252; and a regulation substation determination unit 1102 that receives a train position 951 and substation location information 1151 stored in a substation location table 1101 as input and determines and outputs a regulation substation 1051. Here, the processing modes of each train state determination unit 601 and the power state determination unit 602 are the same as those in the first embodiment.

[0040] 12 is a diagram showing an example of data stored in the substation location table 1101. For example, the data stores the relationship between the substation name and the substation location. The data may also be in the form of a map showing the substation location.

[0041] Next, the processing mode of the adjustment substation determination unit 1102 will be described. This processing is processing for extracting the substation closest to the train position 951. For example, in the substation position data shown in FIG. 12 , if the train position 951 is 5.0 [km], substation A may be extracted. Note that, for example, if the train position 951 is 5.5 [km], either substation A or substation B may be selected because the train is at the midpoint between substation A and substation B. Also, for example, information about line stations may be taken into consideration and substations in a section with a large number of line stations may be included. The reason for including substations in a section with a large number of line stations is that an increase in the number of departures or arrivals from stations increases acceleration / deceleration, making the train more susceptible to the effects of powering / regeneration.

[0042] Next, the processing mode of the substation sending voltage adjuster 1002 will be described. When the regulation substation 1051 obtained from the regulation substation determination unit 1102 in the substation section state determiner 1001 and the line power state 252 obtained from the power state determiner 602 in the substation section state determiner 1001, which indicates the power state of the output range of the regulation substation 1051, are in a balanced state, the substation sending voltage 152 is not changed. When the line power state 252 is excessive powering, the line voltage is considered to be low, so the substation sending voltage 152 is increased by +α [V]. On the other hand, when the line power state 252 is excessive regeneration, the line voltage is considered to be high, so the substation sending voltage 152 is decreased by β [V].

[0043] Here, as in the first embodiment, any numerical values ​​may be used for the values ​​α and β. However, depending on the substation equipment, the voltage range that can be changed may be limited. For example, in a substation configured with a general rectifier, the sending voltage of the substation can only be controlled by switching the tap on the receiving side of the substation. Furthermore, the voltage range is also relatively large, such as 30 V, for a DC 1500 V line. In such cases, control is performed using the voltage change range.

[0044] As a result, it is possible to determine the sending voltage of the substation while taking into consideration the line power status and the relative positions of the train and the substation. By using this sending voltage for control, it is possible to contribute to improving punctuality by making effective use of regeneration and avoiding low voltage conditions.

[0045] 13 is a diagram showing an example of the configuration of a feeding voltage control system according to a third embodiment of the present invention. The difference from the first embodiment shown in FIG. 1 is that the feeding voltage control system 104 of the first embodiment is changed to a feeding voltage control system 1301.

[0046] The feeding voltage control system 1301 determines the sending voltages 152A and 152B of the substations 103A and 103B, respectively, based on the substations 103A and 103B that supply power to the trains 101A, 101B, and 101C through the overhead wires 102, and the voltage and power information 151A, 151B, and 151C of the trains 101A, 101B, and 101C.

[0047] 14 is a diagram showing an example of the configuration of a feeding voltage control system 1301. The feeding voltage control system 1301 is composed of a voltage-power relationship creation unit 201 that receives as input past information on voltage and power 151 from the train 101 and outputs a voltage-power relationship diagram 251, a line power state determination unit 1401 that receives as input the voltage and power information 151 and the voltage-power relationship diagram 251 and determines and outputs a specific voltage adjustment amount 1451, and a sending voltage adjustment unit 1402 that receives as input the voltage adjustment amount 1451 and determines and outputs a substation sending voltage 152.

[0048] 15 is a diagram showing an example of the configuration of the line power state determination unit 1401. The line power state determination unit 1401 includes a train voltage adjustment range calculation unit 1501 that receives voltage and power information 151 and a voltage-power relationship diagram 251 as input and calculates a train power state 651 and a voltage adjustment range 1551, a power state determination unit 602 that receives the train power state 651 as input and determines and outputs a line power state 252, and a line voltage determination unit 1502 that receives the line power state 252 and the voltage adjustment range 1551 for each train as input and determines a voltage adjustment amount 1451. The function of the power state determination unit 602 is the same as in the first embodiment.

[0049] Fig. 16 is a diagram showing an example of a flowchart of the processing executed by each train voltage adjustment range calculation unit 1501. Here, the same numbers are used for steps that execute processing with the same content as the processing steps executed by each train state determination unit 601 of the first embodiment shown in Fig. 7. Furthermore, the processing entity of each processing step is each train voltage adjustment range calculation unit 1501, but the description of that entity will be omitted below.

[0050] In step 701 (S701), it is determined whether the train power and train voltage indicated by the voltage and power information 151 are above the area boundary line 1 in the voltage-power relationship diagram 251 shown in Fig. 3. If the answer is Yes, the process proceeds to step 702 (S702). If the answer is No, the process proceeds to step 703 (S703).

[0051] In step 702 (S702), the train power state 651 is determined to be excessively regenerated, and the process proceeds to step 1601 (S1601).

[0052] In step 1601 (S1601), the voltage when the power of the relevant train indicated by the voltage and power information 151 is assumed to be on the area boundary line 1 of the voltage-power relationship diagram 251 is calculated as boundary voltage 1, and the process proceeds to step 1602 (S1602).

[0053] In step 1602 (S1602), the voltage of the train indicated by the voltage and power information 151 is subtracted from the boundary voltage 1 to obtain the voltage adjustment range A, and the voltage adjustment range B is set to 999999. This completes the process.

[0054] On the other hand, in step 703 (S703), it is determined whether the train power and train voltage indicated by the voltage and power information 151 are above the area boundary line 2 in the voltage-power relationship diagram 251 shown in Fig. 3. If the answer is Yes, proceed to step 704 (S704). If the answer is No, proceed to step 705 (S705).

[0055] In step 704 (S704), the train power state 651 is set to the balanced state, and the process proceeds to step 1603 (S1603).

[0056] In step 1603 (S1603), the voltage when the power of the relevant train indicated by the voltage and power information 151 is assumed to be on the area boundary line 1 of the voltage-power relationship diagram 251 is calculated as boundary voltage 1, and the process proceeds to step 1604 (S1604).

[0057] In step 1604 (S1604), the voltage when the power of the relevant train indicated by the voltage and power information 151 is assumed to be on the area boundary line 2 in the voltage-power relationship diagram 251 is calculated as boundary voltage 2, and the process proceeds to step 1605 (S1605).

[0058] In step 1605 (S1605), the voltage of the train indicated by the voltage and power information 151 is subtracted from the boundary voltage 2 to obtain a voltage adjustment range A, and the voltage of the train indicated by the voltage and power information 151 is subtracted from the boundary voltage 1 to obtain a voltage adjustment range B. This completes the process.

[0059] In step 705 (S705), the train power state 651 is determined to be excessive powering, and the process proceeds to step 1606 (S1606).

[0060] In step 1606 (S1606), the voltage when the power of the relevant train indicated by the voltage and power information 151 is assumed to be on the area boundary line 2 of the voltage-power relationship diagram 251 is calculated as boundary voltage 2, and the process proceeds to step 1607 (S1607).

[0061] In step 1607 (S1607), the voltage of the train indicated by the voltage and power information 151 is subtracted from the boundary voltage 2 to obtain the voltage adjustment range B, and the voltage adjustment range A is set to -999999. This completes the process.

[0062] The voltage adjustment range A and voltage adjustment range B obtained in the above processing steps are output as the voltage adjustment range 1551. Here, if the line power state 252 is excessively regenerated, the voltage adjustment range A indicates the amount of voltage reduction required to change this power state to a balanced state, and if the line power state 252 is in any other state, it indicates how much room there is to lower the voltage (however, lowering the voltage does not change the line power state). Here, the voltage adjustment range A≦0.

[0063] On the other hand, the voltage adjustment range B indicates the voltage increase range required to change the line power state 252 to a balanced state if the line power state 252 is excessive powering, and indicates how much room there is to increase the voltage if the line power state 252 is in any other state (however, increasing the voltage does not change the line power state). Here, the voltage adjustment range B is equal to or greater than 0.

[0064] Therefore, by taking the maximum value for the voltage adjustment range A, the voltage can be reduced without changing any conditions other than excessive regeneration, and by taking the minimum value for the voltage adjustment range B, the voltage can be increased without changing any conditions other than excessive power running.

[0065] Taking these points into consideration, the function of the line voltage determination unit 1502 will be described. Fig. 17 is a diagram showing an example of a flowchart of processing executed by the line voltage determination unit 1502. The line voltage determination unit 1502 is responsible for the processing of each processing step, but a description of this unit will be omitted below.

[0066] In step 1701 (S1701), it is determined whether the line power state 252 is in a balanced state. If Yes, the process proceeds to step 1702 (S1702). If No, the process proceeds to step 1703 (S1703).

[0067] In step 1702 (S1702), since the line power state 252 is in a balanced state, the voltage adjustment amount 1451 is set to 0, and the process ends. In step 1703 (S1703), it is determined whether the line power state 252 is excessive powering. If the result is Yes, the process proceeds to step 1704 (S1704). If the result is No, the process proceeds to step 1705 (S1705).

[0068] In step 1704 (S1704), since the line power state 252 is excessive powering, the voltage adjustment amount 1451 = min(B(i)) (where i = 1, 2, ... n) is calculated based on the voltage adjustment range B, which is the voltage adjustment range 1551, and the process ends. i indicates any train currently on the line, and among the voltage adjustment ranges B of each train, the minimum voltage adjustment range B is used, as described above.

[0069] In step 1705 (S1705), since the line power state 252 is excessively regenerative, the voltage adjustment amount 1451 = max(A(i)) (where i = 1, 2, ... n) is calculated based on the voltage adjustment range A, which is the voltage adjustment range 1551, and the process ends. i indicates any train currently on the line, and among the voltage adjustment ranges A of each train, the maximum voltage adjustment range A is used, as described above.

[0070] Next, we will explain the function of the sending voltage adjustment unit 1402. The sending voltage adjustment unit 1402 adjusts the substation sending voltage 152 so that it becomes equal to the input voltage adjustment amount 1451. However, as mentioned above, the voltage range that can be changed is limited depending on the substation equipment, so the substation sending voltage 152 is changed to a voltage range close to the voltage adjustment amount 1451.

[0071] As described above, in the third embodiment, it is possible to determine the sending voltage of the substation taking into consideration the line power state and the voltage adjustment of each train, and control can be performed using the sending voltage. As a result, it is possible to contribute to improving punctuality by making effective use of regeneration and avoiding low voltage conditions.

[0072] Although the first to third embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the present invention.

[0073] 101A, 101B, 101C...train, 102...overhead line, 103A, 103B...substation, 104, 901, 1301...feed voltage control system, 201...voltage power relation creation unit, 202, 1401...line power state determination unit, 203, 1402...sending voltage adjustment unit, 601...each train state determination unit, 602...power state determination unit, 1001...substation section state determination unit, 1002...substation sending voltage adjustment unit, 1101...substation location table, 1102...adjustment substation determination unit, 1501...each train voltage adjustment range calculation unit, 1502...line voltage determination unit

Claims

1. A feeding voltage control system that controls the feeding voltage for trains traveling on a line, comprising: a line power state determination unit that determines the current power state of the line based on a voltage-power relationship diagram that shows the relationship between the train voltage and train power of the train that has traveled on the line and train voltage information and train power information obtained from each train traveling on the line; and an adjustment unit that adjusts the sending voltage from a substation that supplies power to the line based on the current power state of the line determined by the line power state determination unit.

2. A feeding voltage control system as described in claim 1, characterized in that the voltage-power relationship diagram includes a first area boundary line indicating whether the power state of the train is excessively regenerative or not, and a second area boundary line indicating whether the power state of the train is excessively powered or not.

3. A feeding voltage control system as claimed in claim 1 or 2, further comprising a voltage-power relationship creating unit that creates the voltage-power relationship diagram based on train voltage information and train power information of trains that have previously travelled on the line.

4. A feeding voltage control system as described in claim 2 or 3, characterized in that the line power state determination unit determines whether the power state of each of the trains is excessively regenerative or excessively powered depending on whether the train voltage information and the train power information for the number of trains traveling on the line are included in the area between the first area boundary line and the second area boundary line included in the voltage-power relationship diagram, and determines the current power state of the line based on the determined power state of each of the trains.

5. A feeding voltage control system according to claim 4, characterized in that the line power condition determination unit determines the current power condition of the line according to a majority vote or priority of the power conditions of each of the trains.

6. A feeding voltage control system as described in claim 4 or 5, characterized in that the adjustment unit increases the sending voltage from the substation when the line power state determination unit determines that the current power state of the line is excessive powering, and decreases the sending voltage from the substation when the line power state determination unit determines that the current power state of the line is excessive regeneration.

7. A feeding voltage control system as claimed in any one of claims 1 to 6, characterized in that, when there are multiple substations, the line power condition determination unit determines the substation to be adjusted based on the position of the train, and the adjustment unit adjusts the sending voltage from the substation determined by the line power condition determination unit based on the current power condition of the line.

8. A feeding voltage control system as described in claim 4, characterized in that the line power condition determination unit calculates a voltage adjustment range for each train from the power condition of the train, and calculates a voltage adjustment amount for the line based on the current power condition of the line determined by the line power condition determination unit and the voltage adjustment range, and the adjustment unit adjusts the sending voltage from a substation supplying power to the line based on the voltage adjustment amount for the line calculated by the line power condition determination unit.

9. A feeding voltage control system as described in claim 8, characterized in that, when calculating the voltage adjustment range, the line power state determination unit sets the voltage drop range required to eliminate excessive regeneration when the power state of each train is excessive regeneration as a first voltage adjustment range, and sets the voltage increase range required to eliminate excessive powering when the power state of each train is excessive powering as a second voltage adjustment range.

10. A feeding voltage control system as described in claim 9, characterized in that the line power state determination unit determines the minimum value of the second voltage adjustment range as the voltage adjustment amount when the current power state of the line is excessive powering, and determines the maximum value of the first voltage adjustment range as the voltage adjustment amount when the current power state of the line is excessive regeneration.

11. A feeding voltage control method for controlling feeding voltage for trains traveling on a line, comprising the steps of: creating a voltage-power relationship diagram showing the relationship between the train voltage and train power of the trains that have traveled on the line based on the train voltage and train power of the trains that have traveled on the line in the past; determining the current power condition of the line based on the voltage-power relationship diagram and train voltage information and train power information obtained from each train currently traveling on the line; and adjusting the sending voltage from a substation that supplies power to the line based on the determined current power condition of the line.

12. A feeding voltage control method as described in claim 11, characterized in that it determines whether the train voltage information and the train power information for the number of trains traveling on the line are included in a region sandwiched between a first region boundary line included in the voltage-power relationship diagram, which indicates whether the power state of the train is excessively regenerative or excessively powered, and determines whether the power state of each of the trains is excessively regenerative or excessively powered, and determines the current power state of the line based on the determined power state of each of the trains.

13. A feeding voltage control method as claimed in claim 11 or 12, characterized in that, when the current power state of the line is judged to be excessive powering, the sending voltage from the substation is increased, and when the current power state of the line is judged to be excessive regeneration, the sending voltage from the substation is decreased.

14. A method of controlling a feeding voltage according to any one of claims 11 to 13, characterized in that, when there are a plurality of substations, a substation to be adjusted is determined based on the position of the train, and the sending voltage from the determined substation is adjusted based on the current power condition of the line.

15. A feeding voltage control method as claimed in claim 12, characterized in that it comprises: calculating a voltage adjustment range for each train from the power state of the train; determining a voltage adjustment amount for the line based on the calculated voltage adjustment range and the current power state of the line; and adjusting the sending voltage from a substation supplying power to the line based on the determined voltage adjustment amount for the line.

Images