Real-time dynamic cloud capacity algorithm for traction power supply system transformer
By combining real-time dynamic cloud capacity algorithms with existing equipment, the problems of high cost and long cycle of transformer capacity expansion in electrified railways have been solved, realizing real-time dynamic capacity expansion of transformers and adapting to the development needs of high-speed and heavy-load railways.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAN KAITIAN RAILWAY ELECTRICAL
- Filing Date
- 2022-06-06
- Publication Date
- 2026-06-12
Smart Images
Figure CN115133523B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of electrified railway control technology and relates to a real-time dynamic cloud capacity algorithm for transformers in traction power supply systems. Background Technology
[0002] The development trend of railways is towards heavier freight loads and higher passenger speeds. Heavy freight transport requires increased train traction capacity, while high-speed passenger transport demands higher train speeds. For electrified railways, both scenarios necessitate increased traction power from electric locomotives or electric multiple units (EMUs), thus forcing the traction power supply system to increase the capacity of transformers in traction substations. Once the electrified railway is completed, the transformer capacity of the traction substation is fixed. Since transformers are the core equipment of traction substations, replacing them with larger capacity transformers is extremely costly and involves a long construction period, disrupting normal railway operations. Therefore, researching green and efficient methods for expanding the capacity of traction substation transformers is essential. Summary of the Invention
[0003] The purpose of this invention is to provide a real-time dynamic cloud capacity algorithm for traction power supply system transformers. This algorithm compares the load power of the left and right power supply arms with the rated power of the left and right windings of the transformer in real time to determine whether capacity expansion is needed and how to proceed. The algorithm utilizes power compensation resources such as the left and right windings of the transformer itself, the right and left windings of neighboring transformers, and energy storage devices. Based on a compensation strategy prioritizing these resources, it calculates in real time the compensation power that each resource should provide at any given moment. It then controls the corresponding energy-saving devices to output the appropriate compensation power in real time, thus achieving real-time dynamic capacity expansion of the transformer. Using this algorithm, traction substations do not need to replace their transformers with larger ones; they can simply utilize existing high-power power electronic energy-saving devices and achieve real-time dynamic capacity expansion of the traction substation transformers through a cloud-based algorithm.
[0004] The technical solution adopted in this invention is a real-time dynamic cloud capacity algorithm for transformers in a traction power supply system. The real-time dynamic capacity expansion factor of the transformers in the traction power supply system is specifically calculated using the following formula:
[0005] (1)
[0006] In the formula, the rated power of the left winding of the traction power supply system transformer is P. A The rated power P of the right winding of the traction power supply system transformer B The real-time dynamic cloud capacity of the traction power supply system transformer is p. Y The actual rated capacity P of the transformer in the traction power supply system.
[0007] The invention is further characterized by:
[0008] The specific implementation process of the real-time dynamic cloud capacity algorithm for transformers in the traction power supply system is as follows:
[0009] The load power of the left and right power supply arms is compared with the rated power of the left and right windings in real time, and the following steps are performed based on the judgment:
[0010] Step 1: If the load power of the left and right power supply arms is not greater than the rated power of the left and right windings at the same time, it is not necessary to expand the capacity of the transformer.
[0011] Step 2: Otherwise, if it is determined again that the load power of the left power supply arm is greater than the rated power of the left winding and the load power of the right power supply arm is less than the rated power of the right winding, then it is only necessary to expand the capacity of the left winding of the transformer.
[0012] Step 3: Otherwise, if it is determined again that the load power of the left power supply arm is less than the rated power of the left winding and the load power of the right power supply arm is greater than the rated power of the right winding, then it is only necessary to expand the capacity of the right winding of the transformer.
[0013] Step 4: Otherwise, if it is determined again that the load power of the left and right power supply arms is greater than the rated power of the left and right windings at the same time, the capacity of the left and right windings of the transformer needs to be expanded simultaneously.
[0014] In step 1, it is determined that the load power of both the left and right power supply arms does not exceed the rated power of the left and right windings, i.e., the instantaneous power p of the electric locomotive / motor vehicle load of the left power supply arm. AL Not exceeding the rated power P of the left winding of the transformer in the traction substation A p AL ≤P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL The rated power P of the right winding of the transformer in the traction substation shall not exceed B p BL ≤P B If the judgment result is true, then execute subroutine number one; if the judgment result is false, then execute step 2.
[0015] The first subroutine specifically states that if the judgment result is true, no capacity expansion is needed, and the load power of the left and right power supply arms is generated by the output power of the left and right windings of the traction substation transformer, respectively. A =p AL p B =p BL ;
[0016] In step 2, it is determined that the load power of the left power supply arm is greater than the rated power of the left winding, and the load power of the right power supply arm is less than the rated power of the right winding. That is, the instantaneous power p of the electric locomotive / motor vehicle load of the left power supply arm is... AL Greater than the rated power P of the left winding of the transformer in the traction substation A p AL >PA Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL Less than the rated power P of the right winding of the transformer in the traction substation B p BL <P B If the judgment result is true, then execute subroutine number two; if the judgment result is false, then execute step 3.
[0017] The second subroutine specifically states: when the load power of the left power supply arm is greater than the rated power of the left winding and the load power of the right power supply arm is less than the rated power of the right winding, the load power of the left power supply arm is compensated in real time to realize the dynamic capacity expansion of the traction substation transformer, according to the strategy of prioritizing the right winding of the transformer, followed by the right winding of the transformer of the left neighboring substation, thirdly the left winding of the transformer of the right neighboring substation, and fourthly the energy storage device.
[0018] In step 3, it is determined that the load power of the left power supply arm is less than the rated power of the left winding, and the load power of the right power supply arm is greater than the rated power of the right winding, i.e., the instantaneous power p of the electric locomotive / motor vehicle load of the left power supply arm. AL Less than the rated power P of the left winding of the transformer in the traction substation A p AL <P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL The rated power P of the right winding of the transformer in the traction substation is greater than that of the transformer in the traction substation. B p BL >P B If the judgment result is true, then execute subroutine number three; if the judgment result is false, then execute step 4.
[0019] The third subroutine specifically states: when the load power of the left power supply arm is less than the rated power of the left winding and the load power of the right power supply arm is greater than the rated power of the right winding, the load power of the right power supply arm is compensated in real time to realize the dynamic capacity expansion of the traction substation transformer, according to the strategy of prioritizing the left winding of the transformer, followed by the left winding of the transformer of the right neighboring substation, then the right winding of the transformer of the left neighboring substation, and finally the energy storage device.
[0020] In step 4, it is determined that the load power of both the left and right power supply arms exceeds the rated power of the left and right windings, i.e., the instantaneous load power p of the electric locomotive / motor vehicle on the left power supply arm. AL Exceeding the rated power P of the left winding of the traction substation transformer A p AL ≥P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL Exceeding the rated power P of the right winding of the traction substation transformer B p BL ≥P B Execute subroutine number four;
[0021] The fourth subroutine is as follows: when the load power of both the left and right power supply arms exceeds the rated power of the left and right windings, the power compensation of the load power of the left and right power supply arms is carried out simultaneously according to the strategy of prioritizing the right and left windings of the adjacent transformer and the energy storage equipment, so as to realize the real-time dynamic capacity expansion of the transformer of the traction substation.
[0022] The beneficial effects of this invention are:
[0023] The real-time dynamic cloud capacity algorithm for traction power supply system transformers of the present invention utilizes existing regenerative energy-saving equipment installed in railway traction substations and sectioning stations in terms of hardware, and utilizes existing cloud platform system software of regenerative energy system in terms of software, adding application software functional modules for real-time dynamic cloud capacity of traction substation transformers, so as to realize the real-time dynamic improvement of the equivalent capacity of railway traction substation transformers, adapt to the development needs of high-speed and heavy-load railways, and has good economic and practical value. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the equipment configuration and calculation circuit in the real-time dynamic cloud capacity algorithm of the traction power supply system transformer of the present invention;
[0025] Figure 2 This is a flowchart of the real-time dynamic cloud capacity algorithm steps for the transformer in the traction power supply system of the present invention;
[0026] Figure 3 This is a flowchart of subroutine 1 in the real-time dynamic cloud capacity algorithm for the transformer in the traction power supply system of the present invention;
[0027] Figure 4 This is a flowchart of subroutine 2 in the real-time dynamic cloud capacity algorithm for the transformer in the traction power supply system of the present invention;
[0028] Figure 5 This is a flowchart of subroutine 3 in the real-time dynamic cloud capacity algorithm for the transformer in the traction power supply system of the present invention;
[0029] Figure 6 This is the flowchart of subroutine 4 in the real-time dynamic cloud capacity algorithm of the traction power supply system transformer of the present invention. Detailed Implementation
[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0031] This invention provides a real-time dynamic cloud capacity algorithm for transformers in traction power supply systems, based on the following conditions:
[0032] Condition 1: AC drive locomotives / EMUs are used as traction loads, and their power factor is high, close to 1. Therefore, this algorithm ignores the reactive power part and only needs to calculate the active power part.
[0033] Condition 2: This algorithm does not take into account the efficiency and margin of each device. In actual calculations, the efficiency and margin of each device can be taken into account according to its specific situation.
[0034] Define the real-time dynamic capacity expansion ratio of the transformer in the traction substation as:
[0035] (1)
[0036] like Figure 1 As shown, based on the existing typical equipment configuration and calculation circuit of the traction power supply system, such as Figure 2 As shown, the specific calculations are performed according to the following steps:
[0037] Step 1: Determine if the load power of both left and right power supply arms does not exceed the rated power of the left and right windings, i.e., the instantaneous power p of the electric locomotive / motor vehicle load on the left power supply arm. AL Not exceeding the rated power P of the left winding of the transformer in the traction substation A p AL ≤P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL The rated power P of the right winding of the transformer in the traction substation shall not exceed B p BL ≤P B If the judgment result is true, then execute subroutine 1; if the judgment result is false, then execute step 2.
[0038] Subroutine 1: such as Figure 3 As shown, in this case, no capacity expansion is needed, and all renewable energy energy-saving devices do not require power output. A1 =0, p A2 =0, p B1 =0, p B2 =0, p S =0, the load power of the left and right power supply arms is output from the left and right windings of the traction substation transformer, respectively, p A =p AL p B =p BL ;
[0039] Step 2: Determine if the load power of the left power supply arm is greater than the rated power of the left winding, and the load power of the right power supply arm is less than the rated power of the right winding, i.e., the instantaneous power p of the electric locomotive / motor vehicle load of the left power supply arm. AL Greater than the rated power P of the left winding of the transformer in the traction substation A p AL >P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BLLess than the rated power P of the right winding of the transformer in the traction substation B p BL <P B If the judgment result is true, then execute subroutine 2; if the judgment result is false, then execute step 3.
[0040] Subroutine 2: such as Figure 4 As shown, in step 2, when it is determined that the load power of the left power supply arm is greater than the rated power of the left winding and the load power of the right power supply arm is less than the rated power of the right winding, the load power of the left power supply arm is compensated in real time to realize the dynamic capacity expansion of the transformer in the traction substation, according to the strategy of prioritizing the right winding of the transformer, followed by the right winding of the transformer in the left adjacent substation, then the left winding of the transformer in the right adjacent substation, and finally the energy storage device.
[0041] Step 3: Determine if the load power of the left power supply arm is less than the rated power of the left winding, and the load power of the right power supply arm is greater than the rated power of the right winding, i.e., the instantaneous power p of the electric locomotive / motor vehicle load of the left power supply arm. AL Less than the rated power P of the left winding of the transformer in the traction substation A p AL <P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL The rated power P of the right winding of the transformer in the traction substation is greater than that of the transformer in the traction substation. B p BL >P B If the judgment result is true, then execute subroutine 3; if the judgment result is false, then execute step 4.
[0042] Subroutine 3: such as Figure 5 As shown, in step 3, when it is determined that the load power of the left power supply arm is less than the rated power of the left winding and the load power of the right power supply arm is greater than the rated power of the right winding, the load power of the right power supply arm is compensated in real time to realize the dynamic capacity expansion of the traction substation transformer, according to the strategy of prioritizing the left winding of the transformer, followed by the left winding of the transformer of the right adjacent substation, the right winding of the transformer of the left adjacent substation, and the energy storage device.
[0043] Step 4: After the first three steps, we arrive at this step, indicating that the load power of both the left and right power supply arms exceeds the rated power of the left and right windings. Specifically, the instantaneous load power p of the electric locomotive / motor vehicle on the left power supply arm is... AL Exceeding the rated power P of the left winding of the traction substation transformer A p AL ≥P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL Exceeding the rated power P of the right winding of the traction substation transformer B p BL ≥P B The result of this judgment must be true, so subroutine 4 will be executed directly;
[0044] Subroutine 4: such as Figure 6 As shown, in step 4, when the load power of both the left and right power supply arms exceeds the rated power of the left and right windings, the power compensation of the load power of the left and right power supply arms is carried out simultaneously according to the strategy of prioritizing the right and left windings of the adjacent transformer and the energy storage device, so as to realize the real-time dynamic capacity expansion of the transformer of the traction substation.
[0045] Example 1
[0046] Suppose at a certain moment, there are two power supply arms on the left and right sides of the traction substation, and two power supply arms on the left and right adjacent substations, for a total of four power supply arms. The instantaneous power of the electric locomotive / motor vehicle load are as follows:
[0047] p AL =26.8MW; p BL =18.3MW; p AL1 =17.4MW; p BL1 =19.1MW
[0048] According to step 2, we know that: p AL =26.8MW>P A =20MW; p BL =18.3MW<P B =20MW, then execute subroutine 2, and make judgments and calculations according to the strategy of prioritizing the right winding of the transformer, followed by the right winding of the transformer in the left adjacent station, then the left winding of the transformer in the right adjacent station, and finally the energy storage device, as follows:
[0049] The total compensation power required for the left power supply arm of the substation is:
[0050]
[0051] The compensation power that the right winding of the transformer can provide is:
[0052]
[0053] The compensation power that the right winding of the transformer in the left adjacent station can provide is:
[0054]
[0055] The compensation power that the left winding of the transformer in the adjacent right substation can provide is:
[0056]
[0057] The compensation power required by the energy storage device is:
[0058]
[0059] Therefore, the instantaneous power of each renewable energy energy-saving device is as follows:
[0060]
[0061]
[0062]
[0063]
[0064] The real-time dynamic cloud capacity of the transformer in the traction substation is:
[0065]
[0066] The real-time dynamic capacity expansion ratio of the transformer is:
[0067]
[0068]
[0069] (times).
[0070] Table 1 lists the equipment codes and names used in the method of this invention.
[0071]
[0072] Table 2 shows the rated capacity or rated power of the equipment of the present invention and its embodiments.
[0073]
[0074] Table 3 shows the real-time dynamic cloud capacity or instantaneous power of the present invention.
[0075]
Claims
1. A real-time dynamic cloud capacity algorithm for transformers in a traction power supply system, characterized in that, The specific implementation process is as follows: The load power of the left and right power supply arms is compared with the rated power of the left and right windings in real time, and the following steps are performed based on the judgment: Step 1: If the load power of the left and right power supply arms is not greater than the rated power of the left and right windings at the same time, it is not necessary to expand the capacity of the transformer. Step 2: Otherwise, if it is determined again that the load power of the left power supply arm is greater than the rated power of the left winding and the load power of the right power supply arm is less than the rated power of the right winding, then it is only necessary to expand the capacity of the left winding of the transformer. In step 2, it is determined that the load power of the left power supply arm is greater than the rated power of the left winding, and the load power of the right power supply arm is less than the rated power of the right winding, i.e., the instantaneous power p of the electric locomotive / motor vehicle load of the left power supply arm. AL Greater than the rated power P of the left winding of the transformer in the traction substation A p AL >P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL Less than the rated power P of the right winding of the transformer in the traction substation B p BL <P B If the judgment result is true, then execute subroutine number two; if the judgment result is false, then execute step 3. The second subroutine is as follows: when it is determined that the load power of the left power supply arm is greater than the rated power of the left winding and the load power of the right power supply arm is less than the rated power of the right winding, the load power of the left power supply arm is compensated in real time to realize the dynamic capacity expansion of the transformer in the traction substation, according to the strategy of prioritizing the right winding of the transformer, followed by the right winding of the transformer in the left neighboring substation, then the left winding of the transformer in the right neighboring substation, and finally the energy storage device. Step 3: Otherwise, if it is determined again that the load power of the left power supply arm is less than the rated power of the left winding and the load power of the right power supply arm is greater than the rated power of the right winding, then it is only necessary to expand the capacity of the right winding of the transformer. Step 4: Otherwise, if it is determined again that the load power of the left and right power supply arms is greater than the rated power of the left and right windings at the same time, the capacity of the left and right windings of the transformer needs to be expanded simultaneously. In step 4, it is determined that the load power of both the left and right power supply arms exceeds the rated power of the left and right windings, i.e., the instantaneous load power p of the electric locomotive / motor vehicle on the left power supply arm. AL Exceeding the rated power P of the left winding of the traction substation transformer A p AL ≥P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL Exceeding the rated power P of the right winding of the traction substation transformer B p BL ≥P B Execute subroutine number four; The fourth subroutine is as follows: when the load power of both the left and right power supply arms exceeds the rated power of the left and right windings, the power compensation of the load power of the left and right power supply arms is carried out simultaneously according to the strategy of prioritizing the right and left windings of the adjacent transformer and the energy storage device, so as to realize the real-time dynamic capacity expansion of the transformer of the traction substation. The real-time dynamic capacity expansion factor of the transformer in the traction power supply system is calculated using the following formula: （1） In the formula, the rated power of the left winding of the traction power supply system transformer is P. A The rated power P of the right winding of the traction power supply system transformer B The real-time dynamic cloud capacity of the traction power supply system transformer is p. Y The actual rated capacity of the transformer in the traction power supply system is P.
2. The real-time dynamic cloud capacity algorithm for traction power supply system transformers according to claim 1, characterized in that, In step 1, it is determined that the load power of both the left and right power supply arms does not exceed the rated power of the left and right windings, i.e., the instantaneous load power p of the electric locomotive / motor vehicle on the left power supply arm. AL Not exceeding the rated power P of the left winding of the transformer in the traction substation A p AL ≤P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL The rated power P of the right winding of the transformer in the traction substation shall not exceed B p BL ≤P B If the judgment result is true, then execute subroutine number one; if the judgment result is false, then execute step 2.
3. The real-time dynamic cloud capacity algorithm for traction power supply system transformers according to claim 2, characterized in that, The first subroutine specifically states that if the judgment result is true, no capacity expansion is needed. The load power of the left and right power supply arms is generated by the output power of the left and right windings of the traction substation transformer, respectively, and the instantaneous power p output by the left winding of the traction substation transformer is... A =Instantaneous power p of electric locomotive / motor vehicle load on the left power supply arm AL The instantaneous output power p of the right winding of the transformer in the traction substation B =Instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL .
4. The real-time dynamic cloud capacity algorithm for traction power supply system transformers according to claim 2, characterized in that, In step 3, it is determined that the load power of the left power supply arm is less than the rated power of the left winding, and the load power of the right power supply arm is greater than the rated power of the right winding, i.e., the instantaneous power p of the electric locomotive / motor vehicle load of the left power supply arm. AL Less than the rated power P of the left winding of the transformer in the traction substation A p AL <P A Meanwhile, the instantaneous power p of the electric locomotive / motor vehicle load on the right power supply arm BL The rated power P of the right winding of the transformer in the traction substation is greater than that of the transformer in the traction substation. B p BL >P B If the judgment result is true, then execute subroutine number three; if the judgment result is false, then execute step 4.
5. The real-time dynamic cloud capacity algorithm for traction power supply system transformers according to claim 4, characterized in that, The third subroutine specifically involves: determining that when the load power of the left power supply arm is less than the rated power of the left winding and the load power of the right power supply arm is greater than the rated power of the right winding, the right power supply arm load power is compensated in real time to achieve dynamic capacity expansion of the traction substation transformer, following the strategy of prioritizing the left winding of the transformer, followed by the left winding of the transformer in the adjacent right substation, then the right winding of the transformer in the adjacent left substation, and finally the energy storage device.