Feeding voltage control system and feeding voltage control method

Abstract

To achieve stable transportation and energy saving utilizing regenerative effectiveness by adjusting a delivery voltage from a substation without being affected by a delay or the like of a train diagram.SOLUTION: There is provided a feeding voltage control system configured to control a feeding voltage for trains traveling on a route. The feeding voltage control system comprises: a route power state determination unit that, on the basis of a voltage-power relationship diagram indicating a relationship between a train voltage and a train power of trains that have traveled on the route, and on the basis of train voltage information and train power information obtained from each train traveling on the route, determines a 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, a delivery voltage from a substation that supplies power to the route.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Railway systems are required to provide stable transportation performance without delays and to be energy efficient. As one 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 history information for each train (history information related to date and time, position, power, events, etc.), the position and power obtained from the history 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, position, power, and events on the relevant date and time obtained from the train, the corresponding history information is searched for, and the sending voltage from the substation set in the searched history information is set.

[0004] Patent Document 2 also 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 power feeding calculations are used to solve the electric circuit with the determined voltage command fluctuation range as a constraint, thereby setting the sending voltage from the substation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2018 / 225194 [Patent Document 2] JP 2019-188887 A Summary of the Invention [Problem to be solved by the invention]

[0006] The technology disclosed in Patent Document 1 cannot respond to cases where there is no data related to the relevant event. For example, when a delay occurs, the position and power are different from the steady state, so the voltage cannot be adjusted. Even if a similar situation is used, the situation is not the same, so there is a possibility that regeneration cancellation will occur.

[0007] In addition, with regard to the technology disclosed in Patent Document 2, predictions of train behavior are based on the assumption that the timetable is fixed, and so the accuracy of the predictions is likely to drop significantly in cases where the timetable changes due to delays, etc.

[0008] Therefore, an object of the present invention is to provide a technique for adjusting the sending voltage from a substation based on the current power condition of the line, without being affected by delays in train schedules, etc. [Means for solving the problem]

[0009] In order to solve the above problems, one representative feeding voltage control system of the present invention is a feeding voltage control system that controls the feeding 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 showing 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. Effect of the Invention

[0010] According to the present invention, the substation's sending voltage can be set to an appropriate value for the route based on data on running vehicles, without being affected by delays in train schedules, etc., thereby achieving stable transportation and energy savings through effective regeneration. Problems, configurations and effects other than those described above will become apparent from the description of the following embodiments. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram illustrating an example of a configuration of a feeding voltage control system according to a first embodiment. [Diagram 2] FIG. 1 is a diagram illustrating an example of a configuration of a voltage control system. [Diagram 3] 1 is a graph showing an example of a voltage-power relationship diagram; [Figure 4] FIG. 4 is a diagram showing an example of the characteristics of a high voltage limiter. [Diagram 5] FIG. 4 is a diagram showing an example of the characteristics of a low voltage limiter. [Figure 6] FIG. 2 is a diagram illustrating an example of the configuration of a line power state determination unit. [Figure 7] FIG. 4 is a diagram showing an example of a flowchart of processing executed by each train state determination unit. [Figure 8] 11 is a table showing line power states according to majority vote states. [Figure 9] FIG. 11 is a diagram illustrating an example of the configuration of a feeding voltage control system according to a second embodiment. [Figure 10] FIG. 1 is a diagram illustrating an example of a configuration of a voltage control system. [Figure 11] FIG. 2 is a diagram illustrating an example of the configuration of a substation section state determination unit. [Figure 12] FIG. 11 is a diagram illustrating an example of data stored in a substation location table. [Figure 13] FIG. 11 is a diagram illustrating an example of the configuration of a feeding voltage control system according to a third embodiment. [Figure 14] FIG. 1 is a diagram illustrating an example of a configuration of a voltage control system. [Figure 15] FIG. 2 is a diagram illustrating an example of the configuration of a line power state determination unit. [Figure 16] FIG. 11 is a diagram illustrating an example of a flowchart of a process executed by a train voltage adjustment range calculation unit. [Figure 17] FIG. 4 is a diagram illustrating an example of a flowchart of a process executed by a line voltage determination unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, with reference to the drawings, a description will be given of examples 1 to 3 as modes for carrying out the present invention. Note that the present invention is not limited to these examples. In addition, in the description of the drawings, the same parts are denoted by the same reference numerals. EXAMPLES

[0013] FIG. 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 through overhead lines 102 to trains 101A, 101B and 101C.

[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 is shown 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] FIG. 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] FIG. 3 is a graph showing an example of the voltage-power relationship diagram 251. 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 point 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 higher voltage to lower voltage. Also shown in Fig. 3 are area boundary line 1 (301), area boundary line 2 (302), high voltage limiter start voltage, and low voltage limiter start voltage. Each of these will be explained below.

[0019] We will now explain area boundary line 1 and area boundary line 2. Area boundary line 1 is a line that determines whether the power state of the train is excessively regenerative or not, and is calculated, for example, by the following method. The slope R is calculated by the least squares method based on the point cloud shown in Fig. 3, where the horizontal axis is train power and the vertical axis is train voltage. With the calculated slope R, a straight line that passes through the point cloud consisting of the high voltage limiter start voltage and the maximum regenerative power is created as area boundary line 1.

[0020] On the other hand, the region boundary line 2 is a line for determining whether the power state of the train is excessive powering or not, and is calculated, for example, by the following method. A straight line passing through the points formed by the low voltage limiter start voltage and the maximum powering power with the above-mentioned gradient R is created as the region boundary line 2. Here, the voltage-power relationship diagram divided into areas by the above-mentioned area boundary line 1 and area boundary line 2 is referred to as a "power judgment MAP."

[0021] FIG. 4 is a diagram showing an example of the characteristics of a high voltage limiter. The characteristics of the high voltage limiter, with the horizontal axis representing the train voltage and the vertical axis representing the regenerative current, are such that regeneration is possible with the maximum regenerative current up to the high voltage limiter start voltage for each train voltage, and the regenerative current becomes 0 at the high voltage limiter end voltage, which is equal to or higher than the high voltage limiter start voltage. In other words, this means that the regenerative current is reduced when the train voltage becomes greater than the high voltage limiter start voltage.

[0022] FIG. 5 is a diagram showing an example of the characteristics of a low voltage limiter. The low-voltage limiter has the following characteristics when the horizontal axis is train voltage and the vertical axis is powering current: powering is possible with maximum powering current from high voltage to the low-voltage limiter start voltage for the train voltage, and the powering current becomes 0 at the low-voltage limiter end voltage which is below the low-voltage limiter start voltage. In other words, this means that the powering current is reduced when the train voltage becomes smaller than the low-voltage limiter start voltage.

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

[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 the 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 of the voltage-power relationship diagram 251 shown in Fig. 3. If the answer is Yes, proceed to step 702 (S702). If the answer is No, proceed to step 703 (S703).

[0026] In step 702 (S702), the train power state 651 is determined to be excessive regeneration 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 area boundary line 2 of 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).

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

[0028] Next, the operation of the power state determination unit 602 will be described. 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 into consideration all of the train power states 651.

[0029] If all train power states 651 are in the same state, then the line power states 252 are also set to the same state. If the train power state 651 is a different state, the line power state 252 is determined taking into account the priority of the line. For example, during rush hour, if the train power state 651 includes 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, the line power state 252 may be determined by majority vote. FIG. 8 is a table showing line power states 252 according to the state of majority vote. When deciding by majority vote, if there is 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 either change would have an impact on energy conservation or punctuality, adjustment is made as a balanced state.

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

[0032] If the line power condition 252 is in a balanced state, the substation delivery 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]. 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].

[0033] Here, any numerical value 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 that is 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 a relatively large value, such as 30V, for a DC 1500V line. In such cases, control is performed using the voltage change range.

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

[0035] FIG. 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 through overhead lines 102 to trains 101A, 101B and 101C.

[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 3 and the number of substations is 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] FIG. 10 is a diagram showing an example of the configuration of a feeding voltage control system 901. The feeding voltage control system 901 is composed of a voltage-power relationship creation unit 201 that takes as input past information on voltage and power information 151 from the train 101 and outputs a voltage-power relationship diagram 251, a substation section state determination unit 1001 that takes as input the voltage and power information 151 from the train 101, the 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 takes as input the line power state 252 and the regulating substation 1051 and determines and outputs a substation sending voltage 152.

[0039] FIG. 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 an individual train state determination unit 601 which receives voltage and power information 151 and a voltage-power relationship diagram 251 as input to determine and output a train power state 651, a power state determination unit 602 which receives the train power state 651 as input to determine and output a line power state 252, and a regulation substation determination unit 1102 which receives the train position 951 and substation position information 1151 stored in a substation position table 1101 as input to determine and output a regulation substation 1051. Here, the processing modes in 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 regulation substation determination unit 1102 will be described. This process is a process for extracting the substation closest to the train position 951. For example, in the substation position data shown in FIG. 12, when the train position 951 is 5.0 [km], substation A may be extracted. Note that when the train position 951 is 5.5 [km], for example, either substation A or substation B may be selected since the train position is at the midpoint between substation A and substation B. Also, for example, information on line stations may be taken into consideration and the substation may be included in a section with a large number of line stations. The reason for including the substation in a section with a large number of line stations is that an increase in events of departure or arrival from a station increases acceleration / deceleration, making it more susceptible to the effects of powering / regeneration.

[0042] Next, the processing mode of the substation sending voltage adjusting unit 1002 will be described. When the regulation substation 1051 obtained from the regulation substation determination unit 1102 in the substation section state determination unit 1001 and the line power state 252 obtained from the power state determination unit 602 in the substation section state determination unit 1001 indicating 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 value 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. In addition, the voltage range is a relatively large value, such as 30V, for a line of 1500V DC. In that case, the voltage change range is used for control.

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

[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 line 102, and the voltage and power information 151A, 151B, and 151C of the trains 101A, 101B, and 101C, respectively.

[0047] FIG. 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 which 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 1401 which receives inputs of 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 which receives input of the voltage adjustment amount 1451 and determines and outputs a substation sending voltage 152.

[0048] FIG. 15 is a diagram showing an example of the configuration of the line power state determination unit 1401. As shown in FIG. The line power state determination unit 1401 is composed of an individual train voltage adjustment range calculation unit 1501 that receives as input voltage and power information 151 and voltage-power relationship diagram 251 to calculate train power state 651 and voltage adjustment range 1551, a power state determination unit 602 that receives as input train power state 651 to determine and output line power state 252, and a line voltage determination unit 1502 that receives as input line power state 252 and voltage adjustment range 1551 for each train to determine voltage adjustment amount 1451. The function of the power state determination unit 602 is similar to that of the first embodiment.

[0049] Fig. 16 is a diagram showing an example of a flowchart of the process executed by the each train voltage adjustment range calculation unit 1501. Here, the same numbers are used for steps that execute processes similar to those of the process steps executed by the each train state determination unit 601 of the first embodiment shown in Fig. 7. Also, the subject of each process step is the each train voltage adjustment range calculation unit 1501, but the description of the subject 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 of the voltage-power relationship diagram 251 shown in Fig. 3. If the answer is Yes, proceed to step 702 (S702). If the answer is No, proceed to step 703 (S703).

[0051] In step 702 (S702), the train power state 651 is determined to be excessive regeneration, 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 exists 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 ends 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 exists 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 exists 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 corresponding 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 corresponding train indicated by the voltage and power information 151 is subtracted from the boundary voltage 1 to obtain a voltage adjustment range B. This ends 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 exists 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 ends the process.

[0062] The voltage adjustment range A and the voltage adjustment range B obtained in the above processing steps are output as the voltage adjustment range 1551. Here, the voltage adjustment range A indicates the voltage drop required to change the line power state 252 to a balanced state if the line power state 252 is excessively regenerative, and indicates how much room there is to lower the voltage if the line power state 252 is in any other state (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≧0.

[0064] Therefore, by taking the maximum value for voltage adjustment range A, the voltage can be dropped without changing any conditions other than excessive regeneration, and by taking the minimum value for 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. 17 is a diagram showing an example of a flowchart of processing executed by the line voltage determination unit 1502. The processing entity of each processing step is the line voltage determination unit 1502, but description of the entity will be omitted below.

[0066] In step 1701 (S1701), it is determined whether the line power state 252 is in a balanced state. If it is Yes, the process proceeds to step 1702 (S1702). If it is 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 Yes, the process proceeds to step 1704 (S1704). If 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 an arbitrary train currently located on the line, and among the voltage adjustment ranges B of each train, the minimum voltage adjustment range B is adopted as described above.

[0069] In step 1705 (S1705), because the line power state 252 is excessive regeneration, 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 an arbitrary train currently on the line, and among the voltage adjustment ranges A of each train, the maximum voltage adjustment range A is adopted as described above.

[0070] Next, the function of the sending voltage adjustment unit 1402 will be described. 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 described above, since the voltage range that can be changed is limited depending on the substation equipment, the sending voltage is changed to a voltage range close to the voltage adjustment amount 1451 to become the substation sending voltage 152.

[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 the effective use of regeneration and the improvement of punctuality by avoiding a state where low voltage occurs.

[0072] According to the above-mentioned first to third embodiments, the present invention includes at least the following aspects. <Aspect 1> A feeding voltage control system for controlling a feeding voltage for a train traveling on a line, The system 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 showing the relationship between 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 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.

[0073] <Aspect 2> The feeding voltage control system according to the first aspect, The voltage-power relationship diagram includes a first area boundary line for determining whether the power state of the train is excessively regenerative or not, and a second area boundary line for determining whether the power state of the train is excessively powered or not.

[0074] <Aspect 3> The feeding voltage control system according to the first or second aspect, The system further includes a voltage-power relationship creating unit that creates a voltage-power relationship diagram based on train voltage information and train power information of trains that have previously run on the line.

[0075] <Aspect 4> The feeding voltage control system according to the above aspect 2 or 3, The line power condition determination unit determines whether the power condition of each train is excessively regenerative or excessively powered based on whether the train voltage information and 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 condition of the line based on the determined power condition of each train.

[0076] <Aspect 5> The feeding voltage control system according to the fourth aspect, 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 train.

[0077] <Aspect 6> The feeding voltage control system according to the fourth or fifth aspect, The adjustment unit increases the sending voltage from the substation when the line power condition determination unit determines that the current power condition of the line is excessive powering, and decreases the sending voltage from the substation when the line power condition determination unit determines that the current power condition of the line is excessive regeneration.

[0078] <Aspect 7> The feeding voltage control system according to any one of the first to sixth aspects, 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 output voltage from the substation determined by the line power condition determination unit based on the current power condition of the line.

[0079] <Aspect 8> The feeding voltage control system according to the fourth aspect, The line power condition determination unit calculates a voltage adjustment range for each train from the power condition of that train, and determines a voltage adjustment amount for that line based on the current power condition and voltage adjustment range of the line that it has determined, and the adjustment unit adjusts the output voltage from the substation that supplies power to the line based on the voltage adjustment amount for the line determined by the line power condition determination unit.

[0080] <Aspect 9> The feeding voltage control system according to the eighth aspect, When calculating the voltage adjustment range, the line power condition determination unit sets the voltage drop range required to eliminate excessive regeneration when the power condition 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 condition of each train is excessive powering as a second voltage adjustment range.

[0081] <Aspect 10> The feeding voltage control system according to the ninth aspect, The line power condition determination unit determines the minimum value of the second voltage adjustment range as the voltage adjustment amount when the current power condition 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 condition of the line is excessive regeneration.

[0082] <Aspect 11> A feeding voltage control method for controlling a feeding voltage for a train traveling on a line, comprising: A voltage-power relationship diagram is created based on the train voltage and train power of trains that have previously run on the line, showing the relationship between the train voltage and train power of trains that have run on the line, and the current power condition of the line is determined based on the voltage-power relationship diagram and train voltage information and train power information obtained from each train currently running on the line, and the sending voltage from the substation that supplies power to the line is adjusted based on the determined current power condition of the line.

[0083] <Aspect 12> The feeding voltage control method according to the above aspect 11, The system determines whether the train voltage information and train power information for the number of trains traveling on the line are included in the area between a first area 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 a second area boundary line, which indicates whether the power state of the train is excessively regenerative or excessively powered, and judges the current power state of the line based on the determined power state of each train.

[0084] <Aspect 13> The feeding voltage control method according to the above aspect 11 or 12, If the current power state of the line is determined to be excessive powering, the sending voltage from the substation is increased, and if the current power state of the line is determined to be excessive regeneration, the sending voltage from the substation is decreased.

[0085] <Aspect 14> The feeding voltage control method according to any one of the above aspects 11 to 13, When there are multiple substations, the 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.

[0086] <Aspect 15> The feeding voltage control method according to the twelfth aspect, A voltage adjustment range for each train is calculated from the power state of the train, a voltage adjustment amount for the line is determined based on the calculated voltage adjustment range and the current power state of the line, and the sending voltage from the substation that supplies power to the line is adjusted based on the determined voltage adjustment amount for the line.

[0087] 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 without departing from the gist of the present invention. [Explanation of symbols]

[0088] 101A, 101B, 101C... train, 102... overhead line, 103A, 103B... substation, 104, 901, 1301... Feeder voltage control system, 201... Voltage and power relation creation unit, 202, 1401... line power state determination unit, 203, 1402... sending voltage adjustment unit, 601: Train status determination unit; 602: Power status 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 width calculation unit, 1502: Line voltage determination unit

Claims

1. A feeding voltage control system for controlling a feeding voltage for a train traveling on a line, a line power state determination unit that determines a current power state of the line based on a voltage-power relationship diagram showing a 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; an adjustment unit that adjusts a 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; A feeding voltage control system comprising:

2. The feeding voltage control system according to claim 1, The voltage-power relationship diagram includes a first region boundary line indicating whether the power state of the train is excessively regenerative or not and a second region boundary line indicating whether the power state of the train is excessively powered or not. A feeding voltage control system characterized by:

3. The feeding voltage control system according to claim 1 or 2, a voltage-power relationship creating unit that creates the voltage-power relationship diagram based on train voltage information and train power information of the trains that have previously run on the line; It also has a feeding voltage control system.

4. The feeding voltage control system according to claim 2, The line power state determination unit determines whether the power state of each of the trains is excessively regenerated 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. A feeding voltage control system characterized by:

5. The feeding voltage control system according to claim 4, The line power state determination unit determines the current power state of the line according to a majority vote or a priority of the power states of the trains. A feeding voltage control system characterized by:

6. The feeding voltage control system according to claim 4, The adjustment unit increases a 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 a sending voltage from the substation when the line power state determination unit determines that the current power state of the line is excessive regeneration. A feeding voltage control system characterized by:

7. A feeding voltage control system according to any one of claims 1 to 6, the line power state determination unit determines a substation to be adjusted based on a position of the train when there are a plurality of substations; The adjustment unit adjusts the voltage sent from the substation determined by the line power condition determination unit based on the current power condition of the line. A feeding voltage control system characterized by:

8. The feeding voltage control system according to claim 4, 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 unit and the voltage adjustment range; The adjustment unit adjusts a voltage sent from a substation that supplies power to the line based on a voltage adjustment amount of the line calculated by the line power state determination unit. A feeding voltage control system characterized by:

9. The feeding voltage control system according to claim 8, When calculating the voltage adjustment range, the line power state determination unit determines a 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 determines a voltage increase range required to eliminate excessive powering when the power state of each train is excessive powering as a second voltage adjustment range. A feeding voltage control system characterized by:

10. The feeding voltage control system according to claim 9, 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. A feeding voltage control system characterized by:

11. A feeding voltage control method for controlling a feeding voltage for a train traveling on a line, comprising: creating a voltage-power relationship diagram showing a relationship between the train voltage and the train power of the train that has traveled on the line in the past based on the train voltage and the train power of the train that has traveled on the line in the past; determining a 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 running on the line; Based on the determined current power condition of the line, the sending voltage from the substation that supplies power to the line is adjusted. A feeding voltage control method comprising:

12. The feeding voltage control method according to claim 11, determining whether the train voltage information and the train power information for the number of trains traveling on the line are included in an area between a first area 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 a second area boundary line included in the voltage-power relationship diagram, which indicates whether the power state of the train is excessively regenerative or excessively powered; A current power status of the line is determined based on the determined power status of each train. A feeding voltage control method comprising:

13. The feeding voltage control method according to claim 12, When the current power condition of the line is judged to be excessively powered, the sending voltage from the substation is increased; When the current power condition of the line is judged to be excessively regenerated, the sending voltage from the substation is lowered. A feeding voltage control method comprising:

14. A feeding voltage control method according to any one of claims 11 to 13, When there are a plurality of the substations, a substation to be adjusted is determined based on a position of the train; The determined sending voltage from the substation is adjusted based on the current power condition of the line. A feeding voltage control method comprising:

15. The feeding voltage control method according to claim 12, calculating a voltage adjustment range for each train based on the power state of the train; determining a voltage adjustment amount for the line based on the calculated voltage adjustment range and a current power state of the line; The voltage sent from a substation that supplies power to the line is adjusted based on the determined voltage adjustment amount for the line. A feeding voltage control method comprising:

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