CN114290903A - Simplified design method of overvoltage protection resistor suitable for locomotive and motor car converter - Google Patents
Simplified design method of overvoltage protection resistor suitable for locomotive and motor car converter Download PDFInfo
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- CN114290903A CN114290903A CN202111580492.2A CN202111580492A CN114290903A CN 114290903 A CN114290903 A CN 114290903A CN 202111580492 A CN202111580492 A CN 202111580492A CN 114290903 A CN114290903 A CN 114290903A
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Abstract
The invention relates to a model selection method of overvoltage protection resistors on a current transformer of an electric transmission system, in particular to a simplified design method of the overvoltage protection resistors suitable for a current transformer of a locomotive and a motor vehicle. The overvoltage protection resistor provides a simplified design idea of a single overvoltage protection resistor according to a simplified form of an application main circuit, reduces the type selection types and models, shortens the development period, improves the reliability of the resistor and simultaneously improves the operation stability of a converter system; the structural design of the single overvoltage protection resistor is beneficial to product integration and reduces the design complexity of the cabinet body; the overvoltage protection resistor small component is structurally designed, so that the cabinet body is convenient to arrange, install, repair and maintain.
Description
Technical Field
The invention relates to a model selection method of overvoltage protection resistors on a current transformer of an electric transmission system, in particular to a simplified design method of the overvoltage protection resistors suitable for a current transformer of a locomotive and a motor vehicle.
Background
At present, the railway industry develops rapidly, and the resistor is used as an important power component on a converter of an electric transmission system and plays a role in consuming redundant energy in the operation of the converter system. The overvoltage protection resistor is mainly used for releasing instantaneous overvoltage energy in a circuit by switching on a chopper circuit when the voltage of a main circuit direct-current bus is higher than a set protection action value when a system is braked, idled, slided, suddenly cut by a load, distorted by a network voltage and the like. The overvoltage protection resistor is used as a power device for protecting a vehicle current transformation device from being damaged by system overvoltage impact, and the problem that the resistor models of various vehicle types are specially designed exists in part type selection design. In the past, the resistor parts used by the locomotive vehicle converter system are various in disorder and poor in interchangeability, the modularization and the universalization of the overall design of a train are not facilitated, and meanwhile, the difficulty is increased for the production, the storage and the maintenance of the converter.
Generally, the overvoltage protection resistor electrical parameter selection and the structure type selection are respectively carried out according to the system requirements of converters of different vehicle types, and the method has the following defects:
1. the main circuits of the locomotive and motor car converters are different in topological forms and different in electrical parameters, so that the types and the quantity of overvoltage protection resistors subjected to model selection are large, and the in-plant accumulated pressure inventory is large, so that the reuse of products is not facilitated;
2. the size difference of the resistor structures is large, the installation interfaces are in many forms, the installation position of the overvoltage protection resistor in the converter cabinet body is not fixed, the installation is inconvenient, and the troubleshooting and maintenance of faults are not facilitated;
3. the overvoltage protection resistor has multiple models, each designed resistor model needs to be subjected to a type test, the reliability is low, and the product cost is high.
Disclosure of Invention
The invention provides a method for designing a single overvoltage protection resistor based on simplification of components of a rail transit converter, which adopts a combination mode of a series-parallel single resistor structure, is suitable for different voltage levels and topological circuits of a high-power electric locomotive and a motor car, reduces the complexity of the type selection design of the overvoltage protection resistor applied to the converter, controls the design and production cost, and improves the availability of the overvoltage protection resistor applied to the converter system.
The invention is realized by adopting the following technical scheme: a simplified design method of overvoltage protection resistors suitable for a locomotive and motor car converter is characterized in that overvoltage protection resistor type selection calculation is carried out according to a topological structure of a traction main circuit, voltage grade of an intermediate direct-current link, shaft power, current carrying bearing capacity of an IGBT device, whether an auxiliary main circuit shares an intermediate circuit and capacity of the auxiliary main circuit, and the simplified design of the overvoltage protection resistors is carried out by utilizing single overvoltage protection resistors in combination with practical application.
The overvoltage protection resistor is designed to meet the resistance value calculation range.
The method for designing the overvoltage protection resistor suitable for the locomotive and motor car converter is simplified, the energy which can be borne by the single overvoltage protection resistor is limited, the current carrying capacity is limited, and the single overvoltage protection resistors are connected in series and in parallel for combined use.
According to the simplified design method of the overvoltage protection resistor suitable for the locomotive and motor car converter, the single resistors with different specifications are connected in series and in parallel, the internal aging progress of the resistor is unbalanced, the resistor is possibly damaged, the single overvoltage protection resistors with the same specification are connected in series and in parallel, structural symmetrical matching is guaranteed, and the reliability of the resistor is improved.
The simplified design method of the overvoltage protection resistor suitable for the locomotive and motor car converter is finally used for designing the overvoltage protection resistor in a simplified mode to be a single overvoltage protection resistor with the specification of 1.5 omega-150 kJ.
The simplified design method of the overvoltage protection resistor suitable for the locomotive and motor vehicle converter is characterized in that the single overvoltage protection resistor is in an open type spiral band structure type.
The overvoltage protection resistor is integrated on different traction shafts, and is fixedly arranged in a converter cabinet body in a small assembly mode.
The design and the application of the overvoltage protection resistor have the following beneficial effects:
1. the overvoltage protection resistor is designed in a simplified manner, the types of resistors are reduced, the development period is shortened, and the design cost is reduced;
2. the overvoltage protection resistor is designed in a simplified manner, so that the reliability of the resistor is improved, and the running stability of a system is improved;
3. the overvoltage protection resistor is designed in a simplified manner, so that resistors of different items can be conveniently exchanged and used, and the problem of easy overstock of the stock is solved;
4. the structural design of the single overvoltage protection resistor improves the product integration and the overall structural compactness of the cabinet body;
5. the structural design of the small overvoltage protection resistor component reduces the design complexity of the cabinet body, and facilitates the layout, installation and maintenance of the cabinet body.
Drawings
Fig. 1 is a schematic diagram of a single overvoltage protection resistor.
FIG. 2 is a schematic diagram of a single overvoltage protection resistor with two parallel strings forming a 1.5 Ω -600kJ resistor.
Fig. 3 is a schematic diagram of a resistor of 6 omega-600 kJ formed by four strings of single overvoltage protection resistors.
Fig. 4 is a diagram of the topology of the main circuit applying the overvoltage protection resistor.
Detailed Description
Main circuit simplified design for overvoltage protection resistor application
The selection calculation of the overvoltage protection resistor needs to consider the topology of a main circuit of the system, the voltage grade of an intermediate direct-current link, the maximum power requirement and the current carrying bearing capacity of an IGBT device.
According to the application requirements of the electric transmission system, the topological structure of the main circuit of the traction system is simplified into four forms of a one-integral-one-inverse independent intermediate circuit, two-integral-two-inverse-common intermediate circuit, two-integral-three-inverse-common intermediate circuit and three-integral-three-inverse-common intermediate circuit. The main circuit topological structure of the auxiliary system is simplified into two forms of secondary side electricity taking and intermediate loop electricity taking of the transformer. The main circuit form suitable for the overvoltage protection resistor after the simplification is shown in the attached figure 4.
The current locomotive and motor car converter main circuit topology simplifies the intermediate voltage level into two forms of 1800V and 3600V. The voltage grades of the IGBTs in the system are 3300V and 6500V respectively corresponding to the two intermediate voltage grades, and the specifications of 3300V/1500A and 6500V/750A are recommended to be selected for the IGBTs.
According to the number, the axle weight, the axle power and the like of traction axles of electric locomotives and motor cars applied in the current market and by combining the factors such as low-speed heavy load of vehicles, safety margin, highest running speed of travelling vehicles and the like, finally the axle power of a traction system of the electric locomotives is simplified into 1200kW, 1400kW and 1600kW, the axle power of a traction system of the motor cars is simplified into 350kW and 650kW, the system type auxiliary capacity of an auxiliary converter with the axle power of 1200kW vehicle type is 180kVA, and the system type auxiliary capacity of the auxiliary converter with the axle power of more than 1400kW vehicle type is 270 kVA.
Simplified design method of overvoltage protection resistor
Synthesizing a main circuit simple system result: the overvoltage protection resistor type selection calculation method has the advantages that the topology of a traction main circuit is four, the shaft power is five, the IGBT models are two, the auxiliary circuit is two in the condition whether to share the middle circuit, the auxiliary capacity is two, the overvoltage protection resistor type selection calculation is carried out under the arrangement and combination of the above conditions, the overvoltage protection resistor is combined with practical application, specification and model are messy and various, the overvoltage protection resistor is inconvenient to use and manage, and the overvoltage protection resistor needs to be designed simply. The invention provides a design idea of simplifying the overvoltage protection resistor by using the single overvoltage protection resistor, optimizes the model selection design step and reduces the model selection specification and model.
1) Counting the type of the application resistor of the existing project, and analyzing the simple system to the applicability of the single resistor by combining electrical parameters and structural parameters;
2) the specification and model of the calculated maximum energy resistor are simply used as the simple and systematic selection of the single overvoltage protection resistor, so that the resistor is easy to have large volume and overlarge energy redundancy, and the product cost is increased;
3) the resistance value of the overvoltage protection resistor is limited to the maximum and minimum boundary values by the total power, the voltage grade and the current carrying capacity of the IGBT, and the designed single overvoltage protection resistor needs to meet the resistance value calculation range;
4) the energy which can be borne by the single resistor is limited, the current carrying capacity is limited, and the combination use of series connection and parallel connection can be considered;
5) different specifications of monomer resistors are connected in series-parallel to cause unbalanced aging progress inside the resistors, the resistors have the possibility of being damaged, the same monomer is required to be connected in series-parallel during design, structural symmetrical matching is guaranteed, and the reliability of the resistors is improved.
Considering the factors, and combining the main circuit simplification result, the overvoltage protection resistor is designed to be 1.5 omega-150 kJ specification type of a single body in a simplified mode finally. According to the power requirements of different main circuit topologies of the existing motor vehicle and motor vehicle, the requirements of resistance values and energy required by different projects can be met by connecting the single overvoltage protection resistors in series and in parallel in combination with the IGBT model selection result.
Simplified design of overvoltage protection resistor structure
The existing electric locomotive used resistors have various structural types such as square tube aluminum shell structure, round tube winding structure, open spiral band structure, steel sheet type structure, planar film type structure, cylindrical film type structure and the like. Because square pipe aluminum hull resistance is small, and protection level is high therefore with higher costs, the radiator need be increased to diaphragm type resistance, and steel sheet formula resistance is bulky, and the reliability is low, and open formula spiral band structure resistance compares down in heat radiating area, save space and cost aspect have the advantage, and mature the application in batches on a plurality of projects, consequently the simple monomer overvoltage protection resistance of unifying selects open formula spiral band structure type.
The structural size of the 1.5 omega-150 kJ single overvoltage protection resistor with the final simplified and selected design is shown in figure 1.
The single overvoltage protection resistors can be combined into different resistor models in a series-parallel connection mode to meet the requirements of different main circuits and project application resistors, and the resistor models combined in series-parallel connection are shown in the schematic structure of fig. 2 and 3.
In order to save space, overvoltage protection resistors on different traction shafts are integrated into a whole during integral design, and the overvoltage protection resistors are fixedly arranged in the converter cabinet body in a small assembly mode, so that the overall layout of the cabinet body is facilitated.
Detailed description of the preferred embodiment
According to the principle that the short-time impact energy applied to the overvoltage protection resistor does not exceed the maximum impact energy borne by the resistor, the maximum resistance value of the overvoltage protection resistor is determined by the total power and the voltage grade of the intermediate link borne by the main circuit, and the minimum resistance value of the overvoltage protection resistor is determined by the maximum current limiting value borne by the IGBT. The requirements of each system project are met by using the simple and systematic design of the single overvoltage protection resistors in series-parallel connection, and the application conditions of the single overvoltage protection resistors are shown in table 1.
TABLE 1 simple application of single overvoltage protection resistor
It can be seen from table 1 that the 1.5 Ω -150kJ single overvoltage protection resistor designed by the invention can meet the resistance requirement of the 1800V voltage class platform of the main circuit by forming 3 Ω -300kJ and 1.5 Ω -600kJ specification resistor types by 2 strings and two parallel 2 strings, and meet the resistance requirement of the 3600V voltage class platform of the main circuit by forming 6 Ω -600kJ specification resistor types by 4 series. Compared with five items of overvoltage protection resistor models and different structural types in car loading and running, the design method has the advantages that the 1.5 omega-150 kJ single overvoltage protection resistors can replace the originally applied resistor models of the items in a combined mode, the simple single overvoltage protection resistors provide the interchange possibility of different item products, and the resistor utilization rate is improved.
When the cabinet body is designed, in order to improve the installation compactness of the cabinet body, the overvoltage protection resistor small component is utilized to save space.
The overvoltage protection resistor for the locomotive motor car converter provides a simplified design idea of a single overvoltage protection resistor according to a simplified form of an application main circuit, reduces the type selection types and models, shortens the development period, reduces the design cost, improves the reliability of the resistor and simultaneously improves the operation stability of a converter system; the structural design of the single overvoltage protection resistor is beneficial to product integration and reduces the design complexity of the cabinet body; the overvoltage protection resistor small component is structurally designed, so that the cabinet body is convenient to arrange, install, repair and maintain.
Claims (7)
1. A simplified design method of an overvoltage protection resistor suitable for a locomotive and motor car converter is characterized by comprising the following steps: and performing overvoltage protection resistance type selection calculation according to the topological structure of the traction main circuit, the voltage grade of the intermediate direct-current link, the shaft power, the current-carrying bearing capacity of the IGBT device, whether the auxiliary main circuit shares the intermediate circuit and the capacity of the auxiliary main circuit, and performing simplified design of the overvoltage protection resistance by using the single overvoltage protection resistance in combination with practical application.
2. The method for designing the overvoltage protection resistor in a simplified manner, which is suitable for a locomotive and motor vehicle converter, according to claim 1, is characterized in that: the resistance value of the overvoltage protection resistor is limited to the maximum and minimum boundary values by the total power, the voltage grade and the current carrying bearing capacity of the IGBT device, and the designed single overvoltage protection resistor meets the resistance value calculation range.
3. The method for designing the overvoltage protection resistor in a simplified manner for the current transformer of the locomotive and motor vehicle according to claim 2, wherein the method comprises the following steps: the single overvoltage protection resistor is limited in energy and current carrying capacity, and is used in combination in series and parallel.
4. The method for designing the overvoltage protection resistor in a simplified manner for the current transformer of the locomotive and motor vehicle according to claim 3, wherein the method comprises the following steps: the resistor internal aging progress is unbalanced due to the fact that the resistor single resistors of different specifications are connected in series and in parallel, the resistor is likely to be damaged, series and parallel connection is conducted through the same specification of single overvoltage protection resistors, structural symmetrical matching is guaranteed, and the reliability of the resistor is improved.
5. The method for designing the overvoltage protection resistor in a simplified manner for the current transformer of the locomotive and motor vehicle according to claim 4, wherein the method comprises the following steps: finally, the overvoltage protection resistor is designed to be a single overvoltage protection resistor with the specification and model number of 1.5 omega-150 kJ in a simplified mode.
6. The method for designing the overvoltage protection resistor in a simplified manner for the current transformer of the locomotive and motor vehicle according to claim 5, wherein the method comprises the following steps: the single overvoltage protection resistor is in an open type spiral belt structure type.
7. The simplified design method of the overvoltage protection resistor suitable for the locomotive motor vehicle converter according to claim 4 or 5, characterized in that: overvoltage protection resistors on different traction shafts are integrated into a whole and fixedly arranged in the converter cabinet body in a small assembly mode.
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| CN202111580492.2A CN114290903A (en) | 2021-12-22 | 2021-12-22 | Simplified design method of overvoltage protection resistor suitable for locomotive and motor car converter |
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| CN202111580492.2A CN114290903A (en) | 2021-12-22 | 2021-12-22 | Simplified design method of overvoltage protection resistor suitable for locomotive and motor car converter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090096562A1 (en) * | 2006-04-20 | 2009-04-16 | Toshihiro Nakadai | High-voltage transformer |
| CN206022005U (en) * | 2016-09-14 | 2017-03-15 | 株洲中车时代电气股份有限公司 | A kind of copped wave resistor assembly and its current transformer |
| CN206947961U (en) * | 2017-06-21 | 2018-01-30 | 株洲中车时代电气股份有限公司 | A kind of PWM rectifier direct current supply pilot system based on multiplex |
| CN208027839U (en) * | 2017-12-25 | 2018-10-30 | 比亚迪股份有限公司 | A kind of overvoltage protection resistance box and the rail vehicle with it |
| CN208793197U (en) * | 2018-08-07 | 2019-04-26 | 深圳市蓝丝腾科技有限公司 | A kind of railcar air compressor machine Auto-drainage control circuit |
| CN109767887A (en) * | 2019-02-12 | 2019-05-17 | 成都凯天电子股份有限公司 | The series-parallel method for combining given output resistance |
| CN112953249A (en) * | 2021-04-21 | 2021-06-11 | 株洲中车时代电气股份有限公司 | Current transformer |
-
2021
- 2021-12-22 CN CN202111580492.2A patent/CN114290903A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090096562A1 (en) * | 2006-04-20 | 2009-04-16 | Toshihiro Nakadai | High-voltage transformer |
| CN206022005U (en) * | 2016-09-14 | 2017-03-15 | 株洲中车时代电气股份有限公司 | A kind of copped wave resistor assembly and its current transformer |
| CN206947961U (en) * | 2017-06-21 | 2018-01-30 | 株洲中车时代电气股份有限公司 | A kind of PWM rectifier direct current supply pilot system based on multiplex |
| CN208027839U (en) * | 2017-12-25 | 2018-10-30 | 比亚迪股份有限公司 | A kind of overvoltage protection resistance box and the rail vehicle with it |
| CN208793197U (en) * | 2018-08-07 | 2019-04-26 | 深圳市蓝丝腾科技有限公司 | A kind of railcar air compressor machine Auto-drainage control circuit |
| CN109767887A (en) * | 2019-02-12 | 2019-05-17 | 成都凯天电子股份有限公司 | The series-parallel method for combining given output resistance |
| CN112953249A (en) * | 2021-04-21 | 2021-06-11 | 株洲中车时代电气股份有限公司 | Current transformer |
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