CN115085563B - Resistance type high-voltage shunt system - Google Patents
Resistance type high-voltage shunt system Download PDFInfo
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- CN115085563B CN115085563B CN202210689598.4A CN202210689598A CN115085563B CN 115085563 B CN115085563 B CN 115085563B CN 202210689598 A CN202210689598 A CN 202210689598A CN 115085563 B CN115085563 B CN 115085563B
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- 239000003990 capacitor Substances 0.000 claims description 51
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 17
- 229910052710 silicon Inorganic materials 0.000 abstract description 17
- 239000010703 silicon Substances 0.000 abstract description 17
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- 230000009286 beneficial effect Effects 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/064—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode with several outputs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of high-voltage shunt boxes, solves the technical problems that a silicon stack of the existing high-voltage shunt box is easy to damage and a diode is high in cost, and particularly relates to a resistive high-voltage shunt system, which comprises: the first 40-path positive and negative 65KV high-voltage power supply and the second 40-path positive and negative 65KV high-voltage power supply are used for converting three-phase alternating current into positive and negative 65KV high-voltage direct current; the remote monitoring unit is used for completing multi-path charging tasks, and controlling the overall operation of the first 40-path positive and negative 65KV high-voltage power supply and the second 40-path positive and negative 65KV high-voltage power supply, carrying out information centralized monitoring, recording and displaying operation data and carrying out safety alarming. The invention achieves the aim of effectively reducing the cost on the basis of improving the reliability of the shunt box, enhances the reliability of the high-voltage shunt and reduces the influence of the high-frequency oscillation change of the discharge voltage on the series voltage equalizing of the diodes.
Description
Technical Field
The invention relates to the technical field of high-voltage shunt boxes, in particular to a resistive high-voltage shunt system.
Background
In the high voltage field, when large-device large-system tests are carried out, the variety of equipment is various, one charging device is often used for simultaneously carrying out high-voltage charging on a plurality of sets of equipment, and a set of high-voltage branching device is usually arranged at the rear end of the charging device to carry out high-voltage branching, so that the high-voltage branching can be understood to be similar to household row-to-row 220v power distribution power supply, but the high-voltage branching is carried out in a high-voltage environment, the working voltage is often above dozens of KV, and high requirements are set for stability, reliability, high-voltage tolerance and the like of the device.
The traditional branching mode adopts a silicon stack or a diode mode to carry out branching: the silicon stack mode has limited withstand voltage, and high-frequency vibration is induced after the capacitor discharges, so that the silicon stack is easy to damage; the diode mode is more reliable, but the corresponding cost is also significantly increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a resistive high-voltage shunt system, solves the technical problems that the silicon stack of the existing high-voltage shunt box is easy to damage and the cost of a diode is high, achieves the aim of effectively reducing the cost on the basis of improving the reliability of the shunt box, enhances the reliability of the high-voltage shunt, and reduces the influence of high-frequency oscillation change of discharge voltage on series voltage equalizing of the diode.
In order to solve the technical problems, the invention provides the following technical scheme: a resistive high voltage shunt system comprising:
a 40-path positive and negative 65KV high-voltage power supply I and a 40-path positive and negative 65KV high-voltage power supply II,
The first 40-path positive and negative 65KV high-voltage power supply and the second 40-path positive and negative 65KV high-voltage power supply are used for converting three-phase alternating current into positive and negative 65KV high-voltage direct current;
the remote monitoring unit is used for completing multi-path charging tasks, and controlling the overall operation of the first 40 positive and negative 65KV high-voltage power supply and the second 40 positive and negative 65KV high-voltage power supply, carrying out information centralized monitoring, recording and displaying operation data and carrying out safety alarming;
the first 40-path positive and negative 65KV high-voltage power supply comprises a positive 65KV high-voltage charger and a negative 65KV high-voltage charger which are used for being connected with three-phase alternating current and outputting high-voltage direct current, and further comprises a load capacitor;
The positive 65KV high-voltage charger, the negative 65KV high-voltage charger and the load capacitor are connected through 40 paths of positive and negative 65KV shunt modules, and the 40 paths of positive and negative 65KV shunt modules are used for realizing the charging of the 40 paths of load capacitors and providing energy release channels.
Further, the 40 paths of positive and negative 65KV shunt modules comprise 20 paths of positive 65KV and 20 paths of negative 65KV, the 20 paths of positive 65KV are used for connecting a positive 65KV high-voltage charger and 20 paths of load capacitors, and the 20 paths of negative 65KV are used for connecting a negative 65KV high-voltage charger and other 20 paths of load capacitors.
Further, the 20 paths of the positive 65KV and the 20 paths of the negative 65KV are formed by the same circuit, and the 20 paths of the positive 65KV comprise a supporting capacitor C7 connected to the output end of the high-voltage charger;
the high-voltage battery charger further comprises shunt resistors R1-R20 used for connecting the 20 paths of load capacitors with the high-voltage battery charger respectively, and the shunt resistors R1-R20 are used for charging the 20 paths of load capacitors and providing energy release channels respectively.
Further, the supporting capacitor C7 is used for reducing voltage ripple output by the high-voltage charger, the 20-path shunt of positive 65KV further comprises a resistor R21 connected to the tail end of the shunt and used for avoiding short-circuit discharge of the supporting capacitor C7 when energy is discharged, and the resistor R21 is grounded through HvRly.
Further, the 40-path positive and negative 65KV high-voltage power supply I further comprises a positive high-voltage energy release module and a negative high-voltage energy release module, wherein the positive high-voltage energy release module is connected with a positive 65KV high-voltage charger, and the negative high-voltage energy release module is connected with a negative 65KV high-voltage charger.
Further, the positive high voltage energy release module is used for positive high voltage isolation and energy release of a positive 65KV high voltage charger;
the negative high-voltage energy release module is used for negative high-voltage isolation and energy release of a negative 65KV high-voltage charger.
Further, the first 40-path positive and negative 65KV high-voltage power supply and the second 40-path positive and negative 65KV high-voltage power supply are formed by the same structure.
Further, each of the 40 paths of load capacitors is grounded.
By means of the technical scheme, the invention provides a resistive high-voltage shunt system, which has at least the following beneficial effects:
1. the reliability of the high-voltage shunt is enhanced, and the influence of the high-frequency oscillation change of the discharge voltage on the voltage equalizing of the diode series connection is reduced.
2. The design is simplified, the shunt resistance can be used as a part of the energy discharging resistance at the same time, and the internal structure design can be simplified.
3. The cost is reduced, the cost can be reduced to 70% of the existing cost by adopting a resistance shunt mode, and meanwhile, the energy leakage branch can be reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic block diagram of a resistive high voltage shunt system of the present invention;
FIG. 2 is a schematic circuit diagram of a 20-way positive 65KV high-voltage power supply I according to the invention;
FIG. 3 is a schematic circuit diagram of an n-way positive 65KV high-voltage power supply I according to the invention;
FIG. 4 is a circuit diagram of the circuit topology of the positive 65kV high-voltage charger of the present invention;
FIG. 5 is a discharge simulation diagram of a load capacitor of the present invention;
FIG. 6 is a waveform diagram of the voltage across the load capacitor and resistor shunt of the present invention;
Fig. 7 is a circuit diagram of a prior art diode shunt.
In the figure: 100. a remote monitoring unit; 200. 40 paths of positive and negative 65KV high-voltage power supply I; 300. 40 paths of positive and negative 65KV high-voltage power supply II; 201. a positive 65KV high-voltage charger; 202. a positive high-voltage energy release module; 203. negative 65KV high-voltage charger; 204. a negative high-pressure energy release module; 205. 40 paths of positive and negative 65KV shunt modules; 206. load capacitance.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. Therefore, the realization process of how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
For a further understanding of the prior art, the following explanation is now made: the silicon stack selected by the existing silicon stack shunt box is a 100kV/1A silicon stack of the Anshan Lei Cheng, the silicon stack is damaged in the use process, and after fault analysis, the silicon stack is mainly caused by the following two reasons:
The silicon stack selection withstand voltage is insufficient. In the actual discharging process, the problems of continuous back pressure and oscillation exist, the maximum back pressure can reach 1 time of charging voltage, the maximum voltage applied to the shunt silicon stack can reach 50kV-60kV according to the current test condition, the currently selected silicon stack is 100kV/1A, and the remaining voltage-withstanding allowance is insufficient.
Dynamic pressure equalizing. Considering that the current has a high-frequency oscillation of 150k after the capacitor discharges, the current also has a high-frequency voltage fluctuation at two ends of the shunt silicon stack, which has high requirements on the dynamic voltage equalizing performance of the series diodes in the silicon stack.
Referring to fig. 7, a shunt box for shunting by using a diode is usually used in the prior art in the form of a PCB with diodes connected in series, and then is encapsulated (in series with MUR 2100). The method of diode redundancy series connection is adopted, namely, a mode of reserving a larger voltage level than the current actual working voltage is adopted, the maximum voltage at two ends of the silicon stack reaches 80kV according to the current actual maximum working voltage of 40kV and the back pressure of one time is considered, and the maximum voltage at two ends of the silicon stack is considered according to the 3-time allowance, namely 240kV, so that when a dynamic discharge test is carried out, even if a certain dynamic voltage equalizing characteristic is poor, breakdown phenomenon occurs in the small diodes connected in series, the small diodes are eliminated, the whole can still meet the withstand voltage use requirement, and the whole damage can not be caused.
Meanwhile, through structural improvement, the volume of the shunt box is reduced, the problem that fire striking exists between the outer frame of the shunt box and the diode valve bank is solved, and through structural improvement of high-voltage aviation plug, the aviation plug of the shunt box is not tight enough in connection and is inconvenient to plug.
The improved shunt box has a great increase in cost compared with the prior art, and is mainly characterized by the following aspects:
a. Diode price rises rapidly and the situation of goods period tension occurs, the An Senmei MUR2100 used in the earlier stage is from the price rise of 0.7 yuan/each of the past year to the current price rise of 1.6 yuan/each, and 8 diodes are needed to be connected in series with a PCB (240 diodes on a single board) for a single shunt box;
b. The improvement of the high-voltage aviation plug structure design increases the connection reliability, but the cost is synchronously increased by about 1.5 times;
c. The cost of the pouring sealant is obviously increased, the original pouring sealant is 30 kg more, the current pouring sealant is increased to about 60 kg, and the current new shunt box needs more glue due to the redundancy of the diode than the original one.
In conclusion, compared with the prior shunt box, the performance index of the novel shunt box is greatly improved, the pressure resistance level is improved, the reliability is improved, and the overall cost is improved by about 2 times compared with that of the prior shunt box.
Therefore, the invention provides a resistive high-voltage shunt system, which can effectively reduce the cost of a shunt box on the basis of improving the shunt reliability. Considering the actual situation of diode branching, the embodiment provides a new stable and reliable branching mode in consideration of branching reliability and comprehensive cost, and effectively controls cost, and realizes greater economic benefit, so that the branching is performed by adopting a resistance branching mode.
Referring to fig. 1-7, a resistive high voltage shunt system of the present embodiment is shown.
Referring to fig. 1, a schematic block diagram of a whole resistive high-voltage shunt system is shown, wherein a first 40 positive and negative 65KV high-voltage power supply 200 and a second 40 positive and negative 65KV high-voltage power supply 300 are formed by the same structure, and the first 40 positive and negative 65KV high-voltage power supply 200 and the second 40 positive and negative 65KV high-voltage power supply 300 are both used for converting three-phase alternating current into positive and negative 65KV high-voltage direct current;
the remote monitoring unit 100 is used for completing multiple paths of charging tasks, and controlling the overall operation of the first 40 paths of positive and negative 65KV high-voltage power supply 200 and the second 40 paths of positive and negative 65KV high-voltage power supply 300, carrying out information centralized monitoring, recording and displaying operation data and carrying out safety alarming;
The first 40-path positive and negative 65KV high-voltage power supply 200 comprises a positive 65KV high-voltage charger 201 and a negative 65KV high-voltage charger 203 which are used for being connected with three-phase alternating current and outputting high-voltage direct current, and further comprises a load capacitor 206, wherein the positive 65KV high-voltage charger 201, the negative 65KV high-voltage charger 203 and the load capacitor 206 are connected through a 40-path positive and negative 65KV shunt module 205, the 40-path positive and negative 65KV shunt module 205 is used for realizing charging and energy discharging channels of the 40-path load capacitor, and each path of the 40-path load capacitor 206 is grounded.
The 40-path positive and negative 65KV shunt module 205 comprises a 20-path shunt of positive 65KV and a 20-path shunt of negative 65KV, wherein the 20-path shunt of positive 65KV is used for connecting the positive 65KV high-voltage charger 201 and the 20-path load capacitor, and the 20-path shunt of negative 65KV is used for connecting the negative 65KV high-voltage charger 203 and the other 20-path load capacitor.
The 40-path positive and negative 65KV branching module 205 is designed based on the design and operation experience of the historically relevant branching, and the technical, structural, technological, production, operation, safety, maintenance and other aspects adopted by the existing branching module are analyzed and summarized in detail before the scheme is designed, and the design is carried out by summarizing the design index and the performance requirement of the project. The scheme design ensures the safe, stable and reliable operation of the shunt module. The main design ideas and rules of the design principle of the branching module are as follows:
(1) Adopting a resistive shunt scheme (a shunt module adopting the resistive scheme is called as a resistive shunt for short)
A. The resistance shunt has excellent static and dynamic voltage equalizing characteristics;
B. the resistance shunt has extremely strong voltage shock resistance and reliability;
C. when the multi-branch circuit is charged, the charging voltage difference of each load capacitor is small;
(2) Using modular design
A. The modularized design is adopted, so that the whole structure is compact and easy to move;
B. adopting a dry type encapsulating process, selecting a high-quality insulating encapsulating material, and ensuring that the module has high pressure resistance and no cracking;
C. the difficulty of design and realization is reduced, and the stable and reliable operation of the branching module can be ensured;
D. each branching module has interchangeability; and the expansion and maintenance of the branching module are facilitated.
(3) Simplified design
A. The integrated design is adopted, and a resistor shunt, a voltage divider and a high-voltage aviation plug are built in, so that no external device exists;
B. the resistor shunt has the functions of charging and discharging energy, and fault risk points are reduced, so that reliability is improved.
(4) Maintainability design
A. The modular design has strong interchangeability, is convenient for field replacement, and realizes quick maintenance;
B. the high-voltage aviation plug interface is adopted, so that the disassembly is convenient, and the on-site operation is facilitated;
(5) Security design
A. The thick film high-voltage resistor with extremely strong voltage impact resistance is selected, and the safety of the shunt module is greatly enhanced by matching with the design and selection of reasonable parameters;
B. When the load capacitance is short-circuited, flashover or discharge is asynchronous, the resistance shunt can bear extremely strong transient voltage impact, and the load capacitance is effectively isolated and protected;
C. when discharging back pressure, the high-voltage charger rectifier bridge can be effectively protected to run safely and reliably due to the larger shunt resistance value.
Referring to fig. 2, a positive 65KV 20 shunt and a negative 65KV 20 shunt form a 40 positive and negative 65KV shunt module 205 together, and the positive 65KV 20 shunt includes a supporting capacitor C7 connected to an output terminal of the high voltage charger; the high-voltage battery charger also comprises shunt resistors R1-R20 used for connecting the 20 paths of load capacitors with the high-voltage battery charger respectively, and the shunt resistors R1-R20 are used for charging the 20 paths of load capacitors and providing energy release channels respectively. The supporting capacitor C7 is used for reducing voltage ripple output by the high-voltage charger, and the 20-path shunt of positive 65KV further comprises a resistor R21 which is connected to the tail end of the shunt and used for avoiding short-circuit discharge of the supporting capacitor C7 when energy is discharged, and the resistor R21 is grounded through HvRly.
The main functions of the 40-way positive and negative 65KV shunt module 205 are as follows:
1. the high-voltage charger is connected with the load capacitor to provide a charging and energy discharging channel;
2. When the load capacitor has short circuit and flashover fault, the resistance shunt bears high voltage, and the isolation protection function of the load capacitor is realized;
3. When the load capacitor discharges asynchronously, the resistance shunt bears high voltage, and the isolation protection function of the load capacitor is realized;
4. when the load capacitor discharges and has back pressure, the high-voltage rectifier bridge in the high-voltage charger can be effectively protected;
5. And the energy is consumed and discharged, so that the energy discharging function of the load capacitor is realized.
The resistive shunt form using the 40-way plus or minus 65KV shunt module 205 has the following advantages:
1. the shunt reliability is enhanced, and the influence of high-frequency oscillation change of the discharge voltage on the voltage equalizing of the diode series connection is reduced.
2. The design is simplified, the shunt resistance can be used as a part of the energy discharging resistance at the same time, and the internal structure design can be simplified.
3. The cost is reduced, the existing resistance shunt mode is adopted, the cost can be reduced to 70% of the existing cost, and meanwhile, the energy leakage branch can be reduced.
The 40-path positive and negative 65KV high-voltage power supply I200 also comprises a positive high-voltage energy release module 202 and a negative high-voltage energy release module 204, wherein the positive high-voltage energy release module 202 is connected with a positive 65KV high-voltage charger 201, and the negative high-voltage energy release module 204 is connected with a negative 65KV high-voltage charger 203. The positive high voltage energy release module 202 is used for positive high voltage isolation and energy release of the positive 65KV high voltage charger 201; the negative high voltage energy release module 204 is used for negative high voltage isolation and energy release of the negative 65KV high voltage charger 203.
To ensure the safe, stable and reliable operation of the positive and negative 65KV high-voltage chargers. The main design ideas and rules of the design principle are as follows:
(1) Using modular design
A. The positive and negative 65KV high-voltage charger adopts a modularized design idea, and the reliable operation of the high-power high-voltage charger is realized.
B. the difficulty of design and realization is reduced, and the stable and reliable operation of the high-power supply is facilitated;
C. the power loop is modularized, so that the loop distribution parameters are reduced, and the electromagnetic interference is reduced;
D. the number of internal interfaces is reduced, the volume is reduced, the weight is reduced, and the power density is improved;
E. The conventional power components easy to purchase can be selected, so that the design flexibility is greatly improved;
F. By adopting the technologies of laminated buses, copper bars, magnetic integration and the like and combining with reasonable structural design, the optimal design of a power loop is realized, and meanwhile, the installation difficulty of components in a module is greatly reduced;
G. the system is beneficial to expandability and maintainability, and the use operation is very humanized.
(2) Power topology scheme employing full-bridge LC series resonance
The main circuit of the high-voltage charger adopts a full-bridge LC series resonance power topology (hereinafter referred to as series resonance topology), and the power topology has the following advantages:
1) Series resonant soft switching power topology
A. The power topology soft switch operates, the scheme is mature and reliable, and the power topology soft switch is widely applied to high-voltage high-power occasions;
B. the topology has the characteristic of normal operation of short circuit, and can ensure that the high-voltage charger is intact under the condition of short circuit;
The on and off of the IGBT are soft switches, so that the voltage stress of the IGBT is reduced, and the safety is improved;
D. The high-voltage rectifier bridge works in a natural commutation state, so that the voltage stress of the rectifier diode is reduced, and the safety of the rectifier diode is improved;
E. Electromagnetic interference of the module power supply to the power supply controller and external equipment is reduced;
F. the soft switch is beneficial to high-frequency design, reduces the loss of a power device and improves the power density of the module;
G. The insulation requirement on the transformer is reduced.
2) High-reliability high-efficiency dry-type high-frequency high-voltage transformer
A. The high-voltage transformer adopts a magnetic integration technology: integrating resonant inductance parameters into leakage inductance of the transformer by optimizing the parameters;
B. The novel magnetic core is adopted, so that the winding space of the primary winding and the secondary winding is multiplied, and the parasitic capacitance of the winding of the high-frequency high-transformation-ratio transformer is greatly reduced;
C. The secondary sub-packaging design further reduces the parasitic capacitance of the transformer winding and improves the efficiency of the transformer;
D. the secondary adopts a scheme of packet rectification and series connection, and is matched with a voltage equalizing circuit, so that the reliability and the safety of the secondary rectifying diode are greatly improved.
(3) Maintainability design
A. the operation is simplified, the design is parameterized, and the software end can be configured with a power supply;
B. The interface is optimally designed, the same side of the interface faces outwards, the marks are clear, and wiring and personnel operation are convenient;
C. the modular design has strong interchangeability and is convenient to replace;
D. The high-voltage charger can display fault content and is convenient for fault positioning.
(4) Security design
A. The safety of the high-voltage charger is ensured by the measures of reliable grounding, high-voltage and low-voltage partition, isolation filtering and the like;
B. the series resonance power topology is adopted, and the high-voltage charger can be in short circuit normal operation, so that the safety of the module is fundamentally ensured;
C. the slow power-on and T-shaped protection loop is adopted, so that the safety of the module in the whole working period is ensured;
D. the power components leave enough safety margin;
E. The high voltage and the low voltage in the high voltage charger adopt partition design, and measures such as isolation filtering design ensure safe and reliable operation of a control circuit;
F. The system has a perfect protection control mechanism, and protects the safe and reliable operation of a power supply;
G. the remote monitoring end adopts optical fiber communication, so that strong electricity is effectively isolated, and the safety of operators is ensured.
(5) Positive and negative synchronous output design of high-voltage charger
A. the key signal sharing among all chargers is realized by adopting a high-reliability CAN communication scheme (the content of the charger needs to be further supplemented);
B. The starting and stopping actions of all the chargers are synchronized;
C. realizing real-time synchronous change of the given value of the output voltage of each charger;
D. checking 40 paths of output voltages, and adjusting the synchronism of positive and negative chargers in real time;
E. when the output voltage is asynchronous due to load faults, the system is stopped and the alarm is protected.
And (3) main power topology design of the high-voltage charger:
The power topology of the high-voltage charger consists of a slow power-on part, an input LC filter part, a series resonance part, a high-voltage direct current rectifying filter part, an output T-shaped loop part, a sampling, protecting and driving control circuit part and the like, and takes a positive 65kV high-voltage charger as an example (a negative 65kV high-voltage charger is similar), and the topology design is shown in figure 4.
The high-voltage charger adopts full-bridge LC series resonance power topology, adopts a PFM modulation mode, designs a closed-loop controller, controls the output to be constant current or limited power, and has the advantages of simple control, mature technology, safety, reliability and the like. And closed-loop control is adopted, and after the charging voltage is set, the module charging index requirement can be met.
The diode shunt scheme is compared to the resistive shunt scheme:
The shunt module mainly adopts two schemes of a diode scheme (called diode shunt for short) and a resistance scheme (called resistance shunt for short).
The resistor shunt is formed by connecting basic resistor units with voltage shock resistance in series and parallel, has good dynamic and static voltage equalizing performance, and can be used when transient high voltage shock exists and does not exist; the diode module of the diode shunt is formed by connecting a plurality of diodes (such as 1kV or 1.2kV diodes) in series, and has the advantages of general static voltage equalizing property, poor dynamic voltage equalizing property and no transient voltage impact. The comparison of the diode shunt and the resistive shunt is shown in table 1.
Because the load capacitance is discharged in the field working condition and is not synchronous to generate high back pressure, the voltage equalizing characteristic of the shunt module is extremely tested, and the resistor shunt is selected as the shunt module.
Table 1 comparison of the major characteristics of diode shunt and resistor shunt
For example, a resistive shunt and a diode shunt, also nominally 200kV, the resistive shunt fully withstanding 200kV transient voltage surges; and repeated surges of transient 100kV voltage may cause the diode shunt to break down.
The high-voltage resistor is selected as a main component of the shunt module, and the stability of the resistor shunt is obviously better than that of the diode shunt when proper resistance parameters are selected due to excellent static and dynamic voltage equalizing characteristics of the resistor shunt.
Simulation experiment:
The 40 paths of high-voltage power supplies are respectively connected with 40 paths of load capacitors through 40 paths of resistor shunts by two positive and negative 65kV high-voltage chargers. In the 20-way positive 65kV principle schematic diagram of fig. 2, the resistor shunt bears a large surge voltage in the following two working states:
1) When the load capacitor is short-circuited or flashover, the maximum impulse voltage born by the resistance shunt is 65kV;
2) When the load capacitor discharges asynchronously: the maximum impulse voltage of the resistor shunt is: 65kv+65kv×0.7=110.5 kV;
In the load capacitor discharging simulation diagram of fig. 5, when the load capacitor C2 is discharged first, since the maximum back pressure of the load capacitor during discharging is 70% of the charging voltage, at this time, as shown in fig. 6, the voltage waveform Vm2 at two ends of the load capacitor C2 and the voltage waveform Vm1 at two ends of the resistor shunt R2 have microsecond transient surge voltages at two ends of the resistor shunt, the peak voltage is 110.5kV, and the resistor shunt scheme with extremely strong voltage surge resistance is required to be selected for extremely testing the voltage surge resistance of the shunt module.
The high-voltage resistor is selected as a main component of the shunt module, and the stability of the resistor shunt is obviously better than that of the diode shunt when proper resistance parameters are selected due to excellent static and dynamic voltage equalizing characteristics of the resistor shunt.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For each of the above embodiments, since it is substantially similar to the method embodiment, the description is relatively simple, and reference should be made to the description of the method embodiment for relevant points.
The foregoing embodiments have been presented in a detail description of the invention, and are presented herein with a particular application to the understanding of the principles and embodiments of the invention, the foregoing embodiments being merely intended to facilitate an understanding of the method of the invention and its core concepts; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (8)
1. A resistive high voltage shunt system, comprising:
40 paths of positive and negative 65KV high-voltage power supply I (200) and 40 paths of positive and negative 65KV high-voltage power supply II (300),
The 40 paths of positive and negative 65KV high-voltage power supply I (200) and the 40 paths of positive and negative 65KV high-voltage power supply II (300) are both used for converting three-phase alternating current into positive and negative 65KV high-voltage direct current;
the remote monitoring unit (100) is used for completing multiple paths of charging tasks, and controlling the overall operation of the first 40 paths of positive and negative 65KV high-voltage power supply (200) and the second 40 paths of positive and negative 65KV high-voltage power supply (300), carrying out information centralized monitoring, recording and displaying operation data and carrying out safety alarming;
The first 40-path positive and negative 65KV high-voltage power supply (200) comprises a positive 65KV high-voltage charger (201) and a negative 65KV high-voltage charger (203) which are used for being connected with three-phase alternating current and outputting high-voltage direct current, and further comprises a load capacitor (206);
The positive 65KV high-voltage charger (201), the negative 65KV high-voltage charger (203) and the load capacitor (206) are connected through 40 paths of positive and negative 65KV shunt modules (205), and the 40 paths of positive and negative 65KV shunt modules (205) are used for realizing charging of 40 paths of load capacitors and providing an energy release channel.
2. The resistive high voltage shunt system according to claim 1, wherein: the 40-path positive and negative 65KV shunt module (205) comprises a 20-path shunt of positive 65KV and a 20-path shunt of negative 65KV, wherein the 20-path shunt of positive 65KV is used for connecting a positive 65KV high-voltage charger (201) and a 20-path load capacitor, and the 20-path shunt of negative 65KV is used for connecting a negative 65KV high-voltage charger (203) and another 20-path load capacitor.
3. The resistive high voltage shunt system according to claim 2, wherein: the 20 paths of positive 65KV and the 20 paths of negative 65KV are formed by the same circuit, and the 20 paths of positive 65KV comprise a supporting capacitor C7 connected to the output end of the high-voltage charger;
the high-voltage battery charger further comprises shunt resistors R1-R20 used for connecting the 20 paths of load capacitors with the high-voltage battery charger respectively, and the shunt resistors R1-R20 are used for charging the 20 paths of load capacitors and providing energy release channels respectively.
4. A resistive high voltage shunt system according to claim 3, wherein: the supporting capacitor C7 is used for reducing voltage ripple output by the high-voltage charger, the 20-path shunt of positive 65KV further comprises a resistor R21 which is connected to the tail end of the shunt and used for avoiding short-circuit discharge of the supporting capacitor C7 when energy is discharged, and the resistor R21 is grounded through HvRly.
5. The resistive high voltage shunt system according to claim 1, wherein: the first 40-path positive and negative 65KV high-voltage power supply (200) further comprises a positive high-voltage energy release module (202) and a negative high-voltage energy release module (204), wherein the positive high-voltage energy release module (202) is connected with a positive 65KV high-voltage charger (201), and the negative high-voltage energy release module (204) is connected with a negative 65KV high-voltage charger (203).
6. The resistive high voltage shunt system according to claim 5, wherein: the positive high-voltage energy release module (202) is used for positive high-voltage isolation and energy release of a positive 65KV high-voltage charger (201);
the negative high-voltage energy release module (204) is used for negative high-voltage isolation and energy release of the negative 65KV high-voltage charger (203).
7. The resistive high voltage shunt system according to claim 1, wherein: the 40-path positive and negative 65KV high-voltage power supply I (200) and the 40-path positive and negative 65KV high-voltage power supply II (300) are formed by the same structure.
8. The resistive high voltage shunt system according to claim 1, wherein: each of the 40 paths of load capacitance (206) is grounded.
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| CN208623563U (en) * | 2018-08-22 | 2019-03-19 | 武汉智瑞捷电气技术有限公司 | A kind of square-wave voltage source being isolated using high-voltage relay |
| US11190008B1 (en) * | 2019-03-26 | 2021-11-30 | Apple Inc. | Capacitance pre-charging |
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| JP2007288992A (en) * | 2006-03-20 | 2007-11-01 | Hitachi Ltd | Semiconductor circuit |
| CN104410131B (en) * | 2014-12-17 | 2016-09-14 | 安徽安凯汽车股份有限公司 | A kind of vehicle-mounted mobile charging system and mobile charging control method thereof |
| DE102015225856A1 (en) * | 2015-12-18 | 2017-06-22 | Audi Ag | Charging device and charging method for a high-voltage battery of a motor vehicle |
| CN206422581U (en) * | 2017-02-13 | 2017-08-18 | 陕西柯蓝电子有限公司 | Battery multi-way intelligence charger |
| CN107453462A (en) * | 2017-09-06 | 2017-12-08 | 广东万城万充电动车运营股份有限公司 | A kind of High-reliability large-power DC charging motor |
| CN210041410U (en) * | 2019-07-29 | 2020-02-07 | 武汉智瑞捷电气技术有限公司 | Positive and negative high voltage charger |
| CN114465116B (en) * | 2020-11-10 | 2024-04-19 | 许继电源有限公司 | Multi-output adjustable +/-100 kV high-voltage constant-current system |
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| CN208623563U (en) * | 2018-08-22 | 2019-03-19 | 武汉智瑞捷电气技术有限公司 | A kind of square-wave voltage source being isolated using high-voltage relay |
| US11190008B1 (en) * | 2019-03-26 | 2021-11-30 | Apple Inc. | Capacitance pre-charging |
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