CN102097925A - Concatenated high voltage frequency converter bypassing processing method - Google Patents
Concatenated high voltage frequency converter bypassing processing method Download PDFInfo
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Abstract
The invention discloses a concatenated high voltage frequency converter bypassing processing method, which comprises the following steps of: 1) when a frequency conversion main control system detects a bypassing failure of a certain module, stopping the output of the module, triggering bypassing, simultaneously bypassing the modules of the other two phases of a corresponding stage, keeping three phases of output voltages balanced and keeping a phase angle invariable; and 2) when another module of a different phase and a different stage has the bypassing failure, stopping the output of the module, triggering the bypassing, simultaneously stopping bypassing a bypassed module of the same phase as the module, recovering voltage output, keeping balanced the three phases of output voltages and keeping invariable the phase angle. The bypassing state of a healthy power unit is selectively controlled by a look-up table method, so the method ensures the equal number of three-phase power units providing power output to further fulfill the aim of keeping balanced the three phases of output voltages. Simultaneously, the look-up table method reduces the influence of the failures of the power units on the voltage output capacity of the whole frequency converter system as much as possible.
Description
Technical field
The present invention relates to a kind of high-voltage high-power frequency transformator, in particular, relate to a kind of unit cascade type high voltage big-power transducer, a kind of bypass processing method when one or more power cell fault is provided.
Background technology
Unit cascade type high voltage frequency changer has become a class staple product in high voltage converter field, and the frequency converter of this structure adopts several independently modes of PWM frequency conversion power unit series connection, to realize multi-level high-voltage output, improves output voltage waveforms.Multipleization of the phase shift isolating transformer of many secondary is adopted in the frequency converter input, reaches harmonic cancellation when powering for each power cell respectively, improves input current waveform, improves the purpose of input power factor.This frequency converter can also can also be fully loaded with frequency converter or the derate operation by control system with fault power unit auto by pass under the situation of one or more power cell faults, improved the reliability of system greatly.
But the output order of three-phase converter module is balanced when normally moving, and hinders for some reason and when being in by-path running status, can cause the output of frequency converter three-phase uneven as one or more power cells.At present, for the problem of the time output balance that solves fault power unit by-pass operation, the method for more employing is with the other two-phase power cell bypass of fault power unit with one-level, reaches the purpose of three-phase output voltage balance.But this method has been sacrificed the fan-out capability of normal power unit, has reduced exerting oneself of frequency converter.
With m level series-connected stage connection type high-voltage frequency converter is example, when a power cell fault, adopts above-mentioned bypass processing method, and then output voltage becomes (the m-1)/m of rated voltage; If two power cell faults not at the same level are arranged; then frequency converter will be in the state that has only the operation of m-2 level power unit cascade; output voltage only is (the m-2)/m of rated voltage, and this moment, the on-load ability of frequency converter reduced greatly, under some occasion even can cause output overcurrent and shut down.
Summary of the invention
In view of the foregoing, the purpose of this invention is to provide a kind of new bypass processing method, make, still can keep higher output voltage and load capacity when cascaded high-voltage frequency converter during because of power cell fault by-pass operation.
For achieving the above object, the present invention by the following technical solutions, in that the power cell failure is arranged during by-pass operation, when guaranteeing three-phase output balance, farthest reduce the bypass quantity of " health " power cell, reduce the influence that fault power unit by-pass operation is exerted oneself to frequency converter.
A kind of cascaded high-voltage frequency converter bypass processing method may further comprise the steps:
1) certain power cell i breaks down, and blocks output automatically, and triggers shunting device, guarantees being electrically connected of other " health " power cells;
2) frequency conversion master control system read failure power cell state information, the bypass sign of the corresponding power cell of set, and inquire about the bypass sign of other power cells;
3) if all normally operations of other power cells, then master control system control is exported no-voltages with other two-phase power cells of trouble unit peer, and other power cells are normally operation all, guarantees the three-phase output voltage balance, the voltage fan-out capability reduces 1/m, and m is the total progression of power cell;
4) if other power cells have certain power cell j to have the bypass fault, and be in the by-pass operation state, then by predefined question blank judge this unit whether with new trouble unit homophase;
5) if fruit i and j homophase then 3 handle set by step, have in the system this moment two-stage totally 6 power cells be in the by-pass operation state, voltage fan-out capability reduction 2/m;
6) if i and j homophase not, then reopen with power cell i at the same level and with " health " power cell of power cell j homophase, other cell operation states are constant, have only 3 power cells to be in by-pass operation state in the system this moment, effectively bypass progression is 1, and the voltage fan-out capability reduces 1/m.
Aforesaid cascaded high-voltage frequency converter bypass processing method, it is characterized in that: improve system's output voltage by increasing the given method of each power cell output voltage of three-phase, voltage fan-out capability after the fault is not reduced or few the reduction, concrete grammar is, when the effective bypass progression of frequency converter was n, the instruction of operate as normal power cell output voltage was adjusted into:
(V '≤V
Max), power cell output voltage instruction when wherein V is normal the operation, V ' is that master control system improves the instruction of power cell output voltage, V after the bypass fault
MaxBe the instruction of power cell maximum output voltage, when V ' greater than V
MaxThe time, V is got in the instruction of power cell output voltage
Max
The present invention is by the method for question blank, and optionally the bypass state of control " health " power cell guarantees to provide the three-phase converter module quantity of power output to equate, thereby reaches the purpose of three-phase voltage output balance.Simultaneously, adopt the method for question blank after, reduced of the influence of power cell fault to whole frequency convertor system voltage fan-out capability as far as possible, especially when a plurality of power cell fault, the advantage of the method is more obvious.
Description of drawings
Fig. 1 cascade high voltage transformer power unit circuit structure diagram;
Fig. 2 cascade high voltage transformer constitutes schematic diagram;
The common bypass processing method of Fig. 3 schematic diagram;
Fig. 4 question blank bypass processing method schematic diagram;
Fig. 5 power cell by bypass after, improve the schematic diagram of system's output voltage by the method that increases each power cell voltage given;
Fig. 6 one embodiment of the present of invention flow chart.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
The present invention reaches the control method of the optimum output of output voltage balance by judging phase place and module progression, is applicable to unit module tandem type frequency converter, and individual module has output single phase alternating current (A.C.) voltage function and fault bypass function, may further comprise the steps:
When (1) the frequency conversion master control system detects a certain module bypass class fault Ax_ERR, stop the output of Ax module, and trigger bypass, with other two-phases Bx of corresponding progression, the Cx bypass keeps output three-phase line voltage balance simultaneously, and the phase angle is constant;
(2) when homophase not takes place once more but during the module bypass class fault By_ERR of different progression, stop the output of By module, and trigger bypass.To stop bypass with the bypass module of By homophase simultaneously, recovery voltage output keeps output three-phase line voltage balance, and the phase angle is constant, guarantees that simultaneously the bypass number of modules of each phase is identical, and other do not have the module of bypass to keep normal output.
Fig. 1 is the formation schematic diagram of frequency convertor system, is example with 6 grades of 6KV, and the frequency converter three-phase is made up of 6 grades of power unit cascades respectively, and each power cell is by the control of control cabinet, and control signal adopts optical fiber to isolate between power cell and the control cabinet.
Fig. 2 is power cell main circuit structure figure, is made up of diode rectification, DC filtering, IGBT inverter bridge, controllable silicon bypass four parts.Power cell just often, the bypass segment controllable silicon turn-offs, the IGBT inverter bridge provides the loop for power delivery.During the power cell fault, the IGBT inverter bridge is turn-offed, the conducting of bypass controllable silicon, and bypass segment provides the loop for power delivery, and this moment, this fault power unit output voltage was 0V.
When frequency converter normally moves, the equal operate as normal of three-phase converter module, the power cell output amplitude of master control system control three-phase is identical, the voltage of phase place mutual deviation 120 electrical degrees.When certain power cell work occurs when unusual, will adopt following method to guarantee the balance of three-phase output and reduce the influence of fault to greatest extent output voltage amplitude:
(1), a power cell fault is only arranged
1) fault power unit IGBT inverter bridge is closed, the conducting of bypass controllable silicon, and bypass circulation work is to guarantee being electrically connected of the superior and the subordinate's power cell;
2) master control system monitor power location mode, will with the output voltage instruction zero setting of the other two-phase power cell of fault power unit peer, to guarantee three-phase voltage output balance;
3) master control system improves the output voltage instruction of all the other " health " at different levels power cells to greatest extent according to current running frequency and by-pass operation progression, to improve three-phase voltage output.
With A4 power cell fault is example, shown in figure four, and A4 unit by-pass operation, 0 voltage is exported in B4 and C4 unit, guarantees the three-phase output voltage balance; All the other " health " power cell output voltage phase invariants, amplitude improves, shown in figure three.At this moment, 5 grades of power unit cascade operations of frequency converter, the three-phase output voltage balance, and kept output voltage amplitude to greatest extent.
(2), two-stage or more power cell faults
When frequency converter failure power cell number more than or equal to 2 the time, frequency converter adopts the mode of question blank to carry out the bypass management, optionally, under the prerequisite that guarantees the three-phase output voltage balance, reduce " health " power cell quantity of output no-voltage with " health " power cell output voltage instruction zero setting as far as possible:
Fault power unit by-pass operation, master control system is inquired about other power cell running status, if frequency converter has been in the by-pass operation state, then master control system judges whether new trouble unit place level has been in the by-pass operation state: if be in the by-pass operation state, then do not handle; If be not in the by-pass operation state, then recovery and the newly voltage instruction of " health " power cell of the output zero level of trouble unit homophase again, it is constant that all the other power cells are kept former running status.
Therefore, by the bypass way to manage of question blank,, " health " power cell output no-voltage is only arranged, the reduction of voltage output when having reduced the power cell fault when two not when homophase and power cell fault not at the same level.
With A4, B2 power cell fault is example:
Shown in figure four, according to bypass way to manage commonly used, when A4 power cell fault, A4, B4, C4 power cell output no-voltage, three-phase output voltage balance; Thereafter during B2 power cell fault, B2, C2, A2 power cell output no-voltage.At this moment, frequency converter is in 4 grades of power unit cascade operations, if do not improve each power cell output voltage instruction, then output voltage is reduced to 2/3 of former output voltage;
Shown in figure five, adopt the bypass way to manage of question blank, during A4 power cell fault, A4, B4, C4 power cell output no-voltage, three-phase output voltage balance; Thereafter during B2 power cell fault, B2 power cell by-pass operation, master control system is recovered the instruction of B4 power cell output voltage, and all the other power cells keep former running status constant.At this moment, A4, B2, C4 power cell output zero level, frequency converter is in 5 grades of power unit cascade operations, does not consider to improve under " health " power cell output voltage instruction situation, and output voltage is reduced to 5/6 of former output voltage.
Same processing mode when having power cell to break down again, is still adopted and is carried out the bypass processing in the same way.
Obviously, adopt the bypass way to manage of question blank, significantly reduced " health " power cell quantity of output no-voltage, the output voltage when having improved fault.
Claims (2)
1. a cascaded high-voltage frequency converter bypass processing method is characterized in that, may further comprise the steps:
1) certain power cell i breaks down, and blocks output automatically, and triggers shunting device, guarantees being electrically connected of other " health " power cells;
2) frequency conversion master control system read failure power cell state information, the bypass sign of the corresponding power cell of set, and inquire about the bypass sign of other power cells;
3) if all normally operations of other power cells, then master control system control is exported no-voltages with other two-phase power cells of trouble unit peer, and other power cells are normally operation all, guarantees the three-phase output voltage balance, the voltage fan-out capability reduces 1/m, and m is the total progression of power cell;
4) if other power cells have certain power cell j to have the bypass fault, and be in the by-pass operation state, then by predefined question blank judge this unit whether with new trouble unit homophase;
5) if fruit i and j homophase then 3 handle set by step, have in the system this moment two-stage totally 6 power cells be in the by-pass operation state, voltage fan-out capability reduction 2/m;
6) if i and j homophase not, then reopen with power cell i at the same level and with " health " power cell of power cell j homophase, other cell operation states are constant, have only 3 power cells to be in by-pass operation state in the system this moment, effectively bypass progression is 1, and the voltage fan-out capability reduces 1/m.
2. cascaded high-voltage frequency converter bypass processing method according to claim 1, it is characterized in that: improve system's output voltage by increasing the given method of each power cell output voltage of three-phase, when the effective bypass progression of frequency converter was n, the instruction of operate as normal power cell output voltage was adjusted into:
And V '≤V
Max, power cell output voltage instruction when wherein V is normal the operation, V ' is that master control system improves the instruction of power cell output voltage, V after the bypass fault
MaxBe the instruction of power cell maximum output voltage, when V ' greater than V
MaxThe time, V is got in the instruction of power cell output voltage
Max
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Cited By (6)
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| CN102684467A (en) * | 2012-05-17 | 2012-09-19 | 华为技术有限公司 | Bypass processing method and controller for power unit of H-bridge cascade type equipment |
| CN103078483A (en) * | 2011-10-26 | 2013-05-01 | 乐星产电(无锡)有限公司 | High-voltage inverter device and control method thereof |
| CN103457493A (en) * | 2012-05-31 | 2013-12-18 | 台达电子工业股份有限公司 | Control device and control method in bypassing of power unit |
| CN111509958A (en) * | 2020-04-28 | 2020-08-07 | 广东明阳龙源电力电子有限公司 | Cascade type frequency converter bypass method and cascade type frequency converter |
| EP3796536A4 (en) * | 2018-05-16 | 2021-05-05 | Mitsubishi Electric Corporation | Power conversion device |
| CN112924797A (en) * | 2021-02-07 | 2021-06-08 | 东方日立(成都)电控设备有限公司 | Fault positioning method and system for high-voltage frequency conversion system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078483A (en) * | 2011-10-26 | 2013-05-01 | 乐星产电(无锡)有限公司 | High-voltage inverter device and control method thereof |
| CN103078483B (en) * | 2011-10-26 | 2015-07-01 | 乐星产电(无锡)有限公司 | High-voltage inverter device and control method thereof |
| CN102684467A (en) * | 2012-05-17 | 2012-09-19 | 华为技术有限公司 | Bypass processing method and controller for power unit of H-bridge cascade type equipment |
| CN102684467B (en) * | 2012-05-17 | 2016-05-25 | 华为技术有限公司 | A kind of power unit by-pass processing method and controller of H bridge cascade connection type equipment |
| CN103457493A (en) * | 2012-05-31 | 2013-12-18 | 台达电子工业股份有限公司 | Control device and control method in bypassing of power unit |
| CN103457493B (en) * | 2012-05-31 | 2016-08-03 | 台达电子工业股份有限公司 | Control device during a kind of power unit by-pass and control method |
| EP3796536A4 (en) * | 2018-05-16 | 2021-05-05 | Mitsubishi Electric Corporation | Power conversion device |
| US11515778B2 (en) | 2018-05-16 | 2022-11-29 | Mitsubishi Electric Corporation | Power conversion device |
| CN111509958A (en) * | 2020-04-28 | 2020-08-07 | 广东明阳龙源电力电子有限公司 | Cascade type frequency converter bypass method and cascade type frequency converter |
| CN112924797A (en) * | 2021-02-07 | 2021-06-08 | 东方日立(成都)电控设备有限公司 | Fault positioning method and system for high-voltage frequency conversion system |
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| CN102097925B (en) | 2013-04-10 |
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