CN109802571A - A kind of redundancy control system and method applied to three-phase solid transformer - Google Patents
A kind of redundancy control system and method applied to three-phase solid transformer Download PDFInfo
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Abstract
The present invention relates to a kind of redundancy control systems and method applied to three-phase solid transformer, its technical characterstic is: 1, a kind of redundancy control system applied to three-phase solid transformer, it is characterized by comprising: A, multiple power modules and a redundant power module in B, C three-phase, it is cascaded in series between multiple power modules using input stage, the connection type of output stage parallel cascade；A, B, C three-phase share a redundant power module, which is divided into three input stage, isolation level and output stage parts, and input stage connects three high pressure half control by-pass switch SR_1‑SR_3, output stage connect three low pressure control switch S entirelyR_4‑SR_6；Input stage is the rectification unit of 6 switching tubes composition, and output stage is the inversion unit that 4 switching tubes are constituted.The present invention reduces the number of applications of redundant power module, reduce the transit time of replacement fault power module, effectively increase the operational reliability of system.
Description
Technical field
The invention belongs to power distribution network AC and DC interface class solid-state transformer technical fields, especially a kind of to be applied to three-phase solid
The redundancy control system and method for state transformer.
Background technique
Application further extensive, the power train of power electronics of the power electronic equipment in electric system links in recent years
System has become a predictable trend of the following power network development.The problems such as sustainable growth of energy demand, environmental pollution
The increasingly serious Energy restructuring advanced centered on electricity, characterized by cleaning, to the development and utilization of clean energy resource at
For the common choice of Main Countries.In the urban power distribution network process of power electronics, AC and DC interface class power electronics
Equipment is the interconnection of transmission & distribution net, alternating current-direct current distribution interconnection and distribution based on converters in occupation of very big specific gravity
The formula energy and the access of various forms load etc., provide standard interface, are the energy conversion hinges of intelligent network distribution system.
Wherein, solid-state transformer, also known as be electric power electric transformer, it is the important composition portion of AC and DC interface class equipment
Point.It can also complete waveform control, electric energy matter while completing the functions such as conventional transformer transformation, isolation, energy transmission
The functions such as amount adjusting, power flowcontrol and system stability contorting.As a kind of novel power transformer, solid-state transformer will be not
Advantage is gradually occupied in the smart grid come, becomes mainstream development trend.
In the practical application of solid-state transformer, reliability is a main Consideration, and event occurs inside equipment
When barrier, seamless power supply is quickly provided and is had very important significance.For such problem, Redundant Control is a kind of effective promotion
The solution of equipment operational reliability.
Traditional the technique on redundant control is divided into hot and cold Redundant Control.Under nominal situation, redundant power mould in hot Redundant Control
Block and other power modules work together.When a failure occurs it, fault power module will be removed, and other power modules are adaptive
The adjustment answered is up to new functioning equalization point.In cold redundancy control, redundant power module is after fault power module is removed
It is charging to work, and then is extending transit time.Thus there may be certain surge current, influence equipment and
The safety of system.In addition, such cold and hot Redundant Control needs three redundant power modules for three-phase solid transformer, by
This improves the redundancy cost of equipment.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose a kind of design rationally, rapid dynamic response speed and
The redundancy control system and method applied to three-phase solid transformer of high reliablity.
The present invention solves its realistic problem and adopts the following technical solutions to achieve:
A kind of redundancy control system applied to three-phase solid transformer, comprising: in A, B, C three-phase multiple power modules and
One redundant power module is cascaded in series between multiple power modules, the connection type of output stage parallel cascade using input stage；
A, B, C three-phase share a redundant power module, which is divided into three input stage, isolation level and output stage portions
Point, input stage connects three high pressure half control by-pass switch SR_1-SR_3, output stage connect three low pressure control switch S entirelyR_4-SR_6；
Input stage is the rectification unit of 6 switching tubes composition, and output stage is the inversion unit that 4 switching tubes are constituted.
A kind of redundancy control method applied to three-phase solid transformer, comprising the following steps:
Step 1, starting solid-state transformer carry out uncontrollable rectification to redundant power module low-voltage direct side, and then will hand over
Galvanic electricity is transformed to direct current needed for isolation level；
After step 2, solid-state transformer complete starting, redundant power module low-voltage direct side is charged and maintained, is made
Redundant power module low-pressure side DC voltage maintains reference value；
Step 3, charging and maintenance to redundant power module high voltage DC side make redundant power module high voltage side direct current
Pressure maintains reference value；When the high pressure of redundant power module and low-voltage direct link voltage maintain at a reference value, redundancy function
Rate module prepares to replace faulty power module；
Step 4, when there is a normal power module to break down, carry out the excision of malfunctioning module；
Switch transistor T in step 5, shutdown input stage1And T4, switch transistor T2、T3And T5、T6Enter PWM mode, into H
Bridge rectification；
Step 6 connects S at this timeR_1To connect the three-phase dummy neutral in input stage, SR_4And SR_5Off state is maintained,
SR_6Conducting makes redundant power module output stage parallel connection access C phase；
Step 7, redundant power module inherit the operating parameter of fault power module, complete the replacement of fault power module
Journey.
Moreover, the specific steps that redundant power module low-voltage direct side is charged and maintained of the step 2 include:
(1) by control two targets of controlling angled a and modulation ratio m, inverter is eliminated while realizing balance DC voltage
Reactive circular power flow；
(2) it is charged by low-voltage direct link of the constant-current charge controller to redundant power module, when redundant power mould
When the value of the low-voltage direct link of block is close to reference value, redundant power module is carried out by single phase low voltage DC link balance controller
Control；
(3) the independent active power of output of shunt chopper is adjusted by single phase low voltage DC link balance controller, with
Balance low-voltage direct link；
Moreover, the charging to redundant power module high voltage DC side of the step 3 includes: with the specific steps maintained
(1) it is charged by high voltage dc bus link of the constant peak current charge controller to redundant power module,
By following formula it is found that permanent peak point current charge controller can be by defining different iTL_R_peakReference value is realized different
Charging rate；When the value of the high voltage direct current link of redundant power module is close to reference value, redundant power module will be by independent
High voltage dc bus balance controller control；
dRAnd iTL_RPeak point current iTL_R_peakRelationship are as follows:
In formula, dRFor the duty ratio of low-pressure side H bridge inverter work；iTL_RIt is redundant power module high voltage side intermediate frequency transformation
The electric current of device；iTL_R_peakFor iTL_RPeak point current；l'sIt is the leakage inductance of high-pressure side intermediate-frequency transformer；V'DcL_1 ... .n, RIt is equivalent
Low-voltage direct link voltage；V'DcL_1 ... .n, RIt is high voltage direct current link voltage；
(2) high voltage direct current link is balanced by adjusting the single-phase phase shifting angle of the double active H bridges of isolation level；
Moreover, the specific steps of the step 7 include:
(1) for short trouble, redundant power module can directly inherit the single DC link balance of fault power module
The result of controller；
(2) for open-circuit fault,
When open-circuit fault occurs in input stage cascaded H-bridges, when Diagnostic Time is less than a basic cycle, redundant power module
The result of the single DC link balance controller of fault power module can directly be inherited；
When open-circuit fault occurs in the single H bridge of isolation level, and Diagnostic Time is less than a switch periods, redundant power
Module can directly inherit the result of the single DC link balance controller of fault power module；
When open-circuit fault occurs in output stage parallel connection H bridge, Diagnostic Time be in several milliseconds to 1.5 basic cycles it
Between, the result of single DC link balance controller is by a basic cycle previously stored data cover.
The advantages of the present invention:
1, the present invention is based on three-phase Cascade H bridge type solid-state transformer, a kind of novel redundancy control method is had studied, is adopted
The system and method that a redundant power module is shared with three-phase solid transformer, are effectively saved design and cost of manufacture.This
Outside, the present invention also passes through corresponding controller and adjusts, and the high and low pressure DC link of redundant power module is made to be able to carry out precharge
Certain reference value is operated and be maintained at, the transit time of replacement fault power module is thereby reduced, effectively increases system
Operational reliability.
2, it the present invention is based on the three-phase solid transformer that medium voltage network uses, proposes a kind of applied to solid-state transformer
The redundancy control method of high reliability, three-phase solid transformer shares a redundant power module in this control method, when any
When one original power module breaks down, malfunctioning module will be replaced by redundant power module, this is effectively saved redundancy cost.
In addition, relying on controller, the high and low pressure DC link of redundant power module can be realized precharge operation and can maintain rationally
Referential data, reduce transient state transit time, realize quick dynamic response.
3, the present invention realizes the replacement process of the fault power module almost without transition, with cold and hot redundancy scheme phase
Than without prolonged charging process during fault power module replacing, there is no surge input current, increasing without DC voltage
Amount, also not complicated control algolithm.
4, the present invention only needs a redundant power module and one group of switch that can realize three-phase Redundant Control, drops significantly
Low redundancy cost.
5, the present invention can control the charging rate of redundant power module, this charging method is applied in cold redundancy scheme
When, flexible modulation may be implemented in charging rate at different conditions.When solid-state transformer is in full load condition, charging rate
It can be set in a relatively low value, to inhibit the electric current of policy normal power module.When solid-state transformer be in it is unloaded or
When light condition, charging rate may be configured as high level, to replace fault power module as early as possible.
Detailed description of the invention
Fig. 1 is novel redundancy control system structure chart of the invention；
Fig. 2 (a) is the precharge process flow diagram of redundant power module of the invention；
Fig. 2 (b) is the replacement process flow diagram of fault power module of the invention；
Fig. 3 (a) is the output voltage controller circuit diagram that output stage phase of the invention controls；
Fig. 3 (b) is the working principle diagram for the output voltage controller that output stage phase of the invention controls；
Fig. 3 (c) is the working principle for the output reactive current balance controller that output stage phase of the invention controls
Figure；
Fig. 3 (d) is that the single low-voltage DC including charging process that output stage phase of the invention controls flattens
The working principle diagram of weighing apparatus controller；
Fig. 3 (e) is the synthesis of independent output reference voltage and PWM generator that output stage phase of the invention controls
Working principle diagram；
Fig. 4 (a) is the equivalent circuit diagram for the isolation level that isolation level phase of the invention controls；
Fig. 4 (b) is that the single low-voltage DC including charging process that isolation level phase of the invention controls flattens
The working principle diagram of weighing apparatus controller；
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing:
A kind of redundancy control system applied to three-phase solid transformer, it is characterised in that: include: that its topological structure includes
A, multiple power modules and a redundant power module in B, C three-phase are cascaded in series between multiple power modules using input stage,
The connection type of output stage parallel cascade；In addition, A, B, C three-phase share a redundant power module, the redundant power module point
For three input stage, isolation level and output stage parts, input stage connects three high pressure half control by-pass switch SR_1-SR_3, output
Three low pressure of grade connection control switch S entirelyR_4-SR_6；Input stage is the rectification unit of 6 switching tubes composition, and output stage is 4 switches
The inversion unit that pipe is constituted.
The working principle of redundancy control system applied to three-phase solid transformer of the invention is:
A kind of redundancy control system applied to three-phase solid transformer, including it is respectively provided at each phase in A, B, C three-phase
It all include N number of power module.It uses input stage to be cascaded in series for, the mode of output stage parallel cascade.Furthermore three-phase is one shared
Redundant power module, this redundant power module are divided into three input stage, isolation level and output stage parts.Its input stage connects three
High pressure half control by-pass switch SR_1And SR_3, output stage connect three low pressure control switch S entirelyR_4-SR_6.When there is a power mould in A phase
When block breaks down, T is turned off3And T6, T1、T2And T4、T5Enter PWM mode, completes rectification work.S is connectedR_2, turn off SR_1-
SR_3To connect the three-phase dummy neutral in input stage.S is connectedR_4, turn off SR_5-SR_6To connect redundant power module to output
Grade.B, when C two-phase power module breaks down, the movement of switching tube is similar with the movement of switching tube of breaking down of A phase, is not going to live in the household of one's in-laws on getting married
It states.
A kind of redundancy control method applied to solid-state transformer of the invention, is divided into two stages.First is that redundant power
The pre-charge process of module, second is that the replacement process of fault power module.Wherein, the flow chart of pre-charge process such as Fig. 2 (a) institute
Show (it is assumed that pre-charge process is carried out in C phase)；(assuming that C Xiang Youyi power shown in fault power module replacement process such as Fig. 2 (b)
Module breaks down).
A kind of redundancy control method applied to solid-state transformer is carried out so that C Xiang Youyi power module breaks down as an example
Explanation, comprising the following steps:
Step 1, starting solid-state transformer carry out uncontrollable rectification to redundant power module low-voltage direct side, and then will hand over
Galvanic electricity is transformed to direct current needed for isolation level；
In the present embodiment, before the step 1, SR_1-SR_5It is in an off state, SR_6It is in the conductive state, redundancy
Power module output stage is in parallel with C to be connect；At this point, T1-T3It is in the conductive state, T4-T18In off state, solid-state is completed
Convert alternating current is needed for isolation level by the starting of transformer and the uncontrollable switching process of redundant power module low-voltage direct side
Direct current.After step 1, by anti-paralleled diode the low-voltage dc voltage of redundant power module is maintained in output stage defeated
The peak value of voltage out.
After step 2, solid-state transformer complete starting, redundant power module low-voltage direct side is charged and maintained, is made
Redundant power module low-pressure side DC voltage maintains reference value；
In the present embodiment, after solid-state transformer completes starting, 2 are entered step, carries out redundant power module low-voltage direct
The charging of side and maintenance process, shown in detailed control process such as Fig. 3 (a)-Fig. 3 (e).Hereafter, redundant power module low-pressure side is straight
Galvanic electricity pressure maintains reference value.
The specific steps that redundant power module low-voltage direct side is charged and maintained include:
(1) by control two targets of controlling angled a and modulation ratio m, inverter is eliminated while realizing balance DC voltage
Reactive circular power flow；
(2) it is charged by low-voltage direct link of the constant-current charge controller to redundant power module, when redundant power mould
When the value of the low-voltage direct link of block is close to reference value, redundant power module is carried out by single phase low voltage DC link balance controller
Control；
(3) the independent active power of output of shunt chopper is adjusted by single phase low voltage DC link balance controller, with
Balance low-voltage direct link；
Step 3, charging and maintenance to redundant power module high voltage DC side make redundant power module high voltage side direct current
Pressure maintains reference value；When the high pressure of redundant power module and low-voltage direct link voltage maintain at a reference value, redundancy function
Rate module prepares to replace faulty power module；
In the present embodiment, after charging and the maintenance process of completing redundant power module low-voltage direct side, 3 are entered step,
Charging and the maintenance process for carrying out redundant power module high voltage DC side, shown in detailed control process such as Fig. 4 (a)-Fig. 4 (b).Step
After rapid 3, T7-T18In pulsewidth modulation (PWM) mode, and the high pressure of redundant power module and low-voltage direct link voltage are tieed up
It holds at a reference value, this indicates that redundant power module prepares to replace faulty power module.
The step 3 to redundant power module high voltage DC side charging with maintenance specific steps include:
(1) it is charged by high voltage dc bus link of the constant peak current charge controller to redundant power module,
By following formula it is found that permanent peak point current charge controller can be by defining different iTL_R_peakReference value is realized different
Charging rate；When the value of the high voltage direct current link of redundant power module is close to reference value, redundant power module will be by independent
High voltage dc bus balance controller control；
dRAnd iTL_R_peakRelationship are as follows:
In formula, dRFor the duty ratio of low-pressure side H bridge inverter work；iTL_RIt is redundant power module high voltage side intermediate frequency transformation
The electric current of device；iTL_R_peakFor iTL_RPeak point current；l'sIt is the leakage inductance of high-pressure side intermediate-frequency transformer；V'DcL_1 ... .n, RIt is equivalent
Low-voltage direct link voltage；V'DcL_1 ... .n, RIt is high voltage direct current link voltage.
(2) high voltage direct current link is balanced by adjusting the single-phase phase shifting angle of the double active H bridges of isolation level；
Step 4, when there is a normal power module to break down, carry out the excision of malfunctioning module；
Switch transistor T in step 5, shutdown input stage1And T4, switch transistor T2、T3And T5、T6Enter PWM mode, into H
Bridge rectification；
Step 6 connects S at this timeR_1To connect the three-phase dummy neutral in input stage, SR_4And SR_5Off state is maintained,
SR_6Conducting makes redundant power module output stage parallel connection access C phase；
Step 7, redundant power module inherit the operating parameter of fault power module, complete the replacement of fault power module
Journey.
The specific steps of the step 7 include:
(1) for short trouble, redundant power module can directly inherit the single DC link balance of fault power module
The result of controller；
(2) for open-circuit fault,
When open-circuit fault occurs in input stage cascaded H-bridges, when Diagnostic Time is less than a basic cycle, redundant power module
The result of the single DC link balance controller of fault power module can directly be inherited；
When open-circuit fault occurs in the single H bridge of isolation level, and Diagnostic Time is less than a switch periods, redundant power
Module can directly inherit the result of the single DC link balance controller of fault power module；
When open-circuit fault occurs in output stage parallel connection H bridge, Diagnostic Time be in several milliseconds to 1.5 basic cycles it
Between, the result of single DC link balance controller is by a basic cycle previously stored data cover.
In the present embodiment, the charging and maintenance, redundancy function of redundant power module low-voltage direct bus link are told about in detailed annotation
The charging of rate module high voltage DC bus link and three parts of control parameter for maintaining and inheriting fault power module.Mainly
Corresponding to the step 2 in Fig. 2, step 3 and step 7.
1, the charging and maintenance of redundant power module low-voltage direct bus link
The charging process of redundant power module can carry out in any stage of three-phase EPT.Fig. 3 (a) is shown comprising superfluous
The phase of the output end of remaining power module.Fig. 3 (b) output voltage controller.Fig. 3 (c) indicates single output reactive current balance
Controller, Fig. 3 (d) indicate single low-voltage direct link balance controller.VDcL_1 ... .n, RIt is equivalent low-voltage direct link electricity
Pressure, iO1 ... .n, RIt is the output electric current of output end, vonFor output voltage.α1 ... .n, RFor pilot angle, m1 ... .n, RFor modulation ratio.Pass through
Two targets of controlling angled a and modulation ratio m are controlled, eliminate inverter reactive circular power flow while realizing balance DC voltage.
After step 1, the low-voltage direct link of redundant power module is maintained at the peak value of output voltage, and other power moulds
The low-voltage direct link of block is maintained at reference value by single phase low voltage DC link balance controller.After step 2 starts, redundancy function
The low-voltage direct link of rate module is charged (i by constant-current charge controller* oR-_dIt is a reference value of charging current) to inhibit wave
Gush electric current.When the value of the low-voltage direct link of redundant power module is close to reference value, redundant power module is straight by single phase low voltage
Stream link balance controller is controlled.
In Fig. 3 (c), balance controller adjusts the independent active power of output of shunt chopper, to balance low-voltage direct
Link.Next, with VdcL_1For illustrate the adjustment process of controller.Work as VdcL_1Value be less than other inverters value when, should
The active power of inverter transmitting will be less than other inverters, and then promote VdcL_1, which will continue to VdcL_1It is restored to flat
Mean value.VdcL_avg1And VdcL_avg2It is the average value of low-voltage dc voltage, wherein VdcL_avg2Low-pressure direct comprising redundant power module
The voltage value of stream link, and VdcL_avg1Do not include.At the end of the constant-current charge process of redundant power module, low-voltage direct link
Average value will be from VdcL_avg1It is switched to VdcL_avg2。
2, the charging and maintenance of redundant power module high voltage DC bus link
Fig. 4 (a) shows the equivalent circuit of the isolation level of the phase comprising take high-pressure side as the redundant power mould of reference
Block.V'DcL_1 ... .n, RIt is equivalent low-voltage direct link voltage, V 'DcH_1 ... .n, RIt is high voltage direct current link voltage, iTL_1 ... .n, RIt is
The electric current of high-pressure side intermediate-frequency transformer, l 'sRefer to the leakage inductance of high-pressure side intermediate-frequency transformer.
Isolation stage uses phase shift strategy.After step 2, the high voltage dc bus voltage of redundant power module is remained
Zero, and the high voltage dc bus of other power modules is maintained at a reference value by individual high voltage direct current link balance controller.
After step 3 starts, the high voltage dc bus link of redundant power module is charged by constant peak current charge controller to inhibit
It shoves.When the value of the high voltage direct current link of redundant power module is close to reference value, redundant power module will be by individual high pressure
The control of DC bus balance controller.
Fig. 4 (b) is single high voltage dc bus balance controller.By the single-phase shifting for adjusting the double active H bridges of isolation level
Phase angle balances high voltage direct current link.VdcH_avg1And VdcH_avg2It is the average value of high voltage direct current link, wherein VdcH_avg2Comprising superfluous
The value of complementary work rate module high voltage DC link, and VdcH_avg1Do not include.When the permanent peak current charging process knot of redundant power module
Shu Shi, the average value of high voltage direct current link is from VdcH_avg1It is switched to VdcH_avg2。
During the charging process, on high-tension side H bridge by can not control rectifier work, and the H bridge of low-pressure side serve as have it is variable
Pulse width dRInverter work, wherein " R " indicate redundant power module.iTL_RExpression formula is as follows:
dRValue are as follows:
In turn, dRAnd iTL_R_peakRelationship are as follows:
In formula, dRFor the duty ratio of low-pressure side H bridge inverter work；iTL_RIt is redundant power module high voltage side intermediate frequency transformation
The electric current of device；iTL_R_peakFor iTL_RPeak point current；l'sIt is the leakage inductance of high-pressure side intermediate-frequency transformer；V'DcL_1 ... .n, RIt is equivalent
Low-voltage direct link voltage；V'DcL_1 ... .n, RIt is high voltage direct current link voltage.
Permanent peak point current charge controller can be by defining different iTL_R_peakReference value realizes different charging speed
Degree.
3, the control parameter of fault power module is inherited
When fault power module is substituted by redundant power module, need to inherit fault power module by redundant power module
Control parameter, to reduce transient swing.However, for different types of failure, different abort situation and different failures
The movement of Diagnostic Time, redundant power module is different.
In the failure of numerous types, switch block (for example, IGBT) failure is one of most common type.IGBT failure
It is broadly divided into open-circuit fault or short trouble.Short-circuit hardware protection is the preferred circuit of most of IGBT drivers.Hardware package
The entire time of shield (less than 10 μ s) and fault power replacement process (for example, 20 μ s) is likely less than between the regulating time of controller
Every.Therefore, redundant power module can directly inherit the single DC link balance controller of fault power module as a result, to keep away
Exempt from transient wave.
Open-circuit fault is likely to occur in the single H bridge of input stage cascaded H-bridges, isolation level and output stage parallel connection H bridge.Redundant power
The movement of module should change with different open-circuit positions and different Diagnostic Times, to avoid transient wave.Work as open circuit
Failure occurs in input stage cascaded H-bridges, and when Diagnostic Time is less than a basic cycle, redundant power module can directly inherit failure
The result of the single DC link balance controller of power module.When open-circuit fault occur in the single H bridge of isolation level, diagnosis
When time is less than a switch periods, redundant power module can directly inherit the single DC link balance control of fault power module
The result of device processed.When open-circuit fault occurs in output stage parallel connection H bridge, Diagnostic Time is substantially all in several milliseconds to 1.5
Between phase, the result of single DC link balance controller is by a basic cycle previously stored data (it is assumed that fault identification
Time with positioning is a basic cycle) covering.At this point, redundant power module and other power modules operated normally will be after
Hold new result.
The working principle of the invention is:
A kind of redundancy control system and method applied to three-phase solid transformer, shared one, three-phase solid transformer superfluous
Remaining power module；When thering is a power module to break down in any phase in three-phase solid transformer, available redundancy power mould
Block replaces fault power module in time.Its course of work mainly includes two stages: pre-charging stage and fault power module are replaced
Change process.For having a power module to break down in C phase, detailed work steps are as follows: step 1, starting solid-state transformer,
Uncontrollable rectification is carried out to redundant power module low-voltage direct side；Step 2 makes redundant power module low-pressure side be charged and be tieed up
Its DC voltage is held in reference value；Step 3 makes redundant power module high voltage side be charged and its DC voltage is maintained to refer to
Value；Step 4, the excision for carrying out malfunctioning module；Step 5, T1、T4Shutdown, T2、T3And T5、T6Enter PWM operating mode；Step
6, redundant power module output stage parallel connection is made to access C phase；Step 7, redundant power module inherit the operation ginseng of fault power module
Number completes the replacement process of fault power module.The present invention reduces the number of applications of redundant power module, reduce replacement event
The transit time for hindering power module, effectively increase the operational reliability of system.
It is emphasized that embodiment of the present invention be it is illustrative, without being restrictive, therefore the present invention includes
It is not limited to embodiment described in specific embodiment, it is all to be obtained according to the technique and scheme of the present invention by those skilled in the art
Other embodiments, also belong to the scope of protection of the invention.
Claims (5)
1. a kind of redundancy control system applied to three-phase solid transformer, it is characterised in that: include: multiple in A, B, C three-phase
Power module and a redundant power module are cascaded in series between multiple power modules, output stage parallel cascade using input stage
Connection type；A, B, C three-phase share a redundant power module, which is divided into input stage, isolation level and defeated
Three parts of grade out, input stage connect three high pressure half control by-pass switch SR_1-SR_3, three low pressure of output stage connection are controlled entirely to be opened
Close SR_4-SR_6；Input stage is the rectification unit of 6 switching tubes composition, and output stage is the inversion unit that 4 switching tubes are constituted.
2. a kind of control method of the redundancy control system applied to three-phase solid transformer as described in claim 1, special
Sign is: the following steps are included:
Step 1, starting solid-state transformer carry out uncontrollable rectification to redundant power module low-voltage direct side, and then by alternating current
It is transformed to direct current needed for isolation level；
After step 2, solid-state transformer complete starting, redundant power module low-voltage direct side is charged and maintained, redundancy is made
Power module low-pressure side DC voltage maintains reference value；
Step 3, charging and maintenance to redundant power module high voltage DC side tie up redundant power module high voltage side DC voltage
It holds in reference value；When the high pressure of redundant power module and low-voltage direct link voltage maintain at a reference value, redundant power mould
Block prepares to replace faulty power module；
Step 4, when there is a normal power module to break down, carry out the excision of malfunctioning module；
Switch transistor T in step 5, shutdown input stage1And T4, switch transistor T2、T3And T5、T6Enter PWM mode, it is whole into H bridge
Stream；
Step 6 connects S at this timeR_1To connect the three-phase dummy neutral in input stage, SR_4And SR_5Maintain off state, SR_6
Conducting makes redundant power module output stage parallel connection access C phase；
Step 7, redundant power module inherit the operating parameter of fault power module, complete the replacement process of fault power module.
3. a kind of redundancy control method applied to three-phase solid transformer according to claim 2, it is characterised in that: institute
The specific steps that redundant power module low-voltage direct side is charged and maintained for stating step 2 include:
(1) it is idle that inverter is eliminated by control two targets of controlling angled a and modulation ratio m, while realizing balance DC voltage
Circulation；
(2) it is charged by low-voltage direct link of the constant-current charge controller to redundant power module, when redundant power module
When the value of low-voltage direct link is close to reference value, redundant power module is controlled by single phase low voltage DC link balance controller
System；
(3) the independent active power of output of shunt chopper is adjusted, by single phase low voltage DC link balance controller with balance
Low-voltage direct link.
4. a kind of redundancy control method applied to three-phase solid transformer according to claim 2, it is characterised in that: institute
State step 3 to redundant power module high voltage DC side charging with maintenance specific steps include:
(1) it is charged, is passed through by high voltage dc bus link of the constant peak current charge controller to redundant power module
Following formula are it is found that permanent peak point current charge controller can be by defining different iTL_R_peakReference value realizes different fill
Electric speed；When the value of the high voltage direct current link of redundant power module is close to reference value, redundant power module will be by individually high
Press the control of DC bus balance controller；
dRAnd iTL_RPeak point current iTL_R_peakRelationship are as follows:
In formula, dRFor the duty ratio of low-pressure side H bridge inverter work；iTL_RIt is redundant power module high voltage side intermediate-frequency transformer
Electric current；iTL_R_peakFor iTL_RPeak point current；l'sIt is the leakage inductance of high-pressure side intermediate-frequency transformer；V'DcL_1 ... .n, RIt is equivalent low
Press DC tache voltage；V'DcL_1 ... .n, RIt is high voltage direct current link voltage；
(2) high voltage direct current link is balanced by adjusting the single-phase phase shifting angle of the double active H bridges of isolation level.
5. a kind of redundancy control method applied to three-phase solid transformer according to claim 2, it is characterised in that: institute
The specific steps for stating step 7 include:
(1) for short trouble, redundant power module can directly inherit the single DC link balance control of fault power module
The result of device；
(2) for open-circuit fault,
When open-circuit fault occurs in input stage cascaded H-bridges, when Diagnostic Time is less than a basic cycle, redundant power module can be straight
Succeed the result for holding the single DC link balance controller of fault power module；
When open-circuit fault occurs in the single H bridge of isolation level, and Diagnostic Time is less than a switch periods, redundant power module
The result of the single DC link balance controller of fault power module can directly be inherited；
When open-circuit fault occurs in output stage parallel connection H bridge, Diagnostic Time was between several milliseconds to 1.5 basic cycles,
The result of single DC link balance controller is by a basic cycle previously stored data cover.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111600467A (en) * | 2020-03-21 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | System operation method for improving stability of energy router |
| CN111769536A (en) * | 2020-05-26 | 2020-10-13 | 华为技术有限公司 | Power supply device and power supply method |
| CN112600399A (en) * | 2020-12-15 | 2021-04-02 | 国网湖北省电力有限公司电力科学研究院 | Cascaded H-bridge type medium-voltage UPS power unit bypass control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600467A (en) * | 2020-03-21 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | System operation method for improving stability of energy router |
| CN111600467B (en) * | 2020-03-21 | 2022-07-29 | 青岛鼎信通讯股份有限公司 | System operation method for improving stability of energy router |
| CN111769536A (en) * | 2020-05-26 | 2020-10-13 | 华为技术有限公司 | Power supply device and power supply method |
| CN112600399A (en) * | 2020-12-15 | 2021-04-02 | 国网湖北省电力有限公司电力科学研究院 | Cascaded H-bridge type medium-voltage UPS power unit bypass control method |
| CN112600399B (en) * | 2020-12-15 | 2022-01-04 | 国网湖北省电力有限公司电力科学研究院 | Cascaded H-bridge type medium-voltage UPS power unit bypass control method |
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Application publication date: 20190524 |