CN104079153B - A kind of method improving series connection chain type convertor equipment dynamic response - Google Patents
A kind of method improving series connection chain type convertor equipment dynamic response Download PDFInfo
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- CN104079153B CN104079153B CN201310109779.6A CN201310109779A CN104079153B CN 104079153 B CN104079153 B CN 104079153B CN 201310109779 A CN201310109779 A CN 201310109779A CN 104079153 B CN104079153 B CN 104079153B
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Abstract
The present invention discloses a kind of method improving series connection chain type convertor equipment dynamic response, and convertor equipment based on serial module structure topology, described topology includes at least 2 serial module structures being sequentially connected in series；Serial module structure in whole topological structure is circulated successively as redundant module, carry out bypass process: valve base controls device and issues the bypass commands serial module structure internal control plate to wherein one or more modules, serial module structure internal control plate directly controls the controllable devices pulse of serial module structure, makes this module be in bypass condition, redundancy standby；After certain interval of time, valve base controls device and regains the bypass commands issuing this module, and issues the bypass commands serial module structure internal control plate to next or multiple modules, it is achieved shift cycle redundancy successively.The method can meet reliability and the dynamic response performance of series connection chain type convertor equipment, controls simple, and avoids the system voltage rush of current to equipment.
Description
Technical field
The invention belongs to Electric Power Automation Equipment and control technical field, use cyclic redundancy technology particularly to one
The method improving series connection chain type convertor equipment dynamic response.
Background technology
In the convertor equipment topology of serial module structure, how electric such as chain static synchronous compensator, half-bridge moduleization be
Flat current transformer, full-bridge modules Multilevel Inverters, cascade connection type two level/Multilevel Inverters etc., in order to carry
High equipment operational reliability, generally arranges at least one redundant module, and these modules are in side when normal work
Line state, does not affect the equipment method of operation, is thrown by redundant module when certain module of series connection breaks down
Enter, malfunctioning module is bypassed, it is achieved that the excision of fault.
Under tradition redundant mode, the control to redundant module uses static mode, i.e. selected redundant module to begin
It is in bypass condition eventually, although by refetching the normal receiving and transmitting signal that can guarantee that this module, but electricity can be controlled more
Road, drive circuit and power device are chronically at same operating mode, easily cause device aging and stress fatigue,
Reduce equipment operational reliability.
Under tradition redundant mode, redundant module is chronically at bypass condition, and its DC capacitor voltage is zero, this
The control power supply of module cannot obtain from self, it is necessary to obtains from other modules so that the load of serial module structure is not
Symmetry, exacerbates the imbalance of serial module structure voltage, it is necessary to be acted upon in the controlling, adds answering of control
Polygamy, reduces robustness.
Under tradition redundant mode, redundant module DC capacitor voltage is zero, when other module failures by redundancy
Module puts into, and is now zero due to redundant module DC voltage, thus the output of the voltage source of equivalence has a breach,
Can cause the system voltage rush of current to equipment, and then there will be the toning of DC voltage, be unfavorable for that equipment is pacified
Entirely.
Dynamically ring in consideration of it, the present inventor proposes a kind of employing cyclic redundancy technology raising series connection chain type convertor equipment
The method answered, this case thus produces.
Summary of the invention
The purpose of the present invention, is to provide a kind of method improving series connection chain type convertor equipment dynamic response, and it can
Meet reliability and the dynamic response performance of series connection chain type convertor equipment, control simple, and avoid system voltage
Rush of current to equipment.
In order to reach above-mentioned purpose, the solution of the present invention is:
A kind of method improving series connection chain type convertor equipment dynamic response, convertor equipment based on serial module structure is opened up
Flutterring, described topology comprises at least 2 serial module structures being sequentially connected in series, each serial module structure all include 4 switching tubes,
One DC capacitor and a discharge resistance, the emitter stage of the first switching tube connects the colelctor electrode of the 3rd switching tube,
The emitter stage of second switch pipe connects the colelctor electrode of the 4th switching tube, and the colelctor electrode of first and second switching tube is common
Connecting the positive pole of DC capacitor, the negative pole of DC capacitor connects the emitter stage of third and fourth switching tube respectively, described
Discharge resistance is attempted by the two ends of DC capacitor；The tie point of described first and third switching tube is drawn a terminal and is made
For the input of serial module structure, the tie point of second, four switching tubes draws defeated as serial module structure of a terminal
Going out end, described each serial module structure is linked in sequence and forms convertor equipment based on serial module structure topology；By whole topology
Serial module structure in structure circulates successively as redundant module, carries out bypass process: valve base controls device and issues side
Road order is to the serial module structure internal control plate of wherein one or more modules, and serial module structure internal control plate is direct
Control the controllable devices pulse of serial module structure, make this module be in bypass condition, redundancy standby；When being spaced one section
After between, valve base controls device and regains the bypass commands issuing this module, and issues bypass commands to next or many
The serial module structure internal control plate of individual module, it is achieved shift cycle redundancy successively.
Above-mentioned interval time, span was 0.1ms～200ms.
Switching tube in above-mentioned each serial module structure uses controlled shutoff device or bidirectional thyristor.
After using such scheme, the present invention makes serial module structure be in redundant state in turn, controls simple, whole solution
Impact when redundant module of having determined puts into and overshoot problem, it is to avoid redundant module is in static stand-by state for a long time
Unreliability, improve series connection chain type convertor equipment operational reliability and dynamic response performance, and avoid and be
The system voltage rush of current to equipment.Present invention may apply to all topological structures containing serial module structure, bag
Include chain static synchronous compensator, half-bridge module Multilevel Inverters, full-bridge modules Multilevel Inverters,
Cascade connection type two level/Multilevel Inverters etc., do not change because of the basic structure of module；And be applicable to include respectively
Kind of capacity, the application of various electric pressure, including and be not limited to 6kV, 10kV, 20kV, 33kV, 66kV,
110kV, 220kV, 330kV, 500kV electric pressure, can meet different scales, the chain of different electric pressure
The Redundant Control of formula cascaded structure needs, and does not increase equipment cost, and control performance optimizes substantially.
Accompanying drawing explanation
Fig. 1 is the cyclic redundancy scheme pulse cycle schematic diagram that the present invention provides；
Fig. 1 (a) is the structural representation of single serial module structure；
Fig. 2 is the optimal PWM sequential chart that the present invention provides；
Fig. 3 is that cyclic redundancy controls lower redundant instruction and voltage oscillogram；
Wherein, the abscissa of 3 subgraphs is consistent, is all time shaft, unit: ms；First subgraph (a)
Ordinate be serial module structure number, without unit；The ordinate of second subgraph (b) is A phase 1# module
DC voltage, unit: V；The ordinate of the 3rd subgraph is that A phase module runs total voltage, unit: V；
Fig. 4 is the dynamic response figure that cyclic redundancy controls lower failure bypass；
Wherein, the abscissa of 3 subgraphs is consistent, is all time shaft, unit: ms；First subgraph (a)
Ordinate be module DC voltage perunit value, without unit；The ordinate of second subgraph (b) is serial chain
The alternating voltage of formula convertor equipment access point and electric current without value of symbol, without unit；The ordinate of the 3rd subgraph
It is meritorious/reactive power, unit: MVA.
Detailed description of the invention
Below with reference to accompanying drawing, technical scheme is described in detail.
The present invention provides a kind of method improving series connection chain type convertor equipment dynamic response, and the present invention is based on series connection mould
The convertor equipment topology of block, including at least 2 serial module structures being sequentially connected in series, is string shown in Fig. 1 (a)
The structural representation of gang mould block, described each serial module structure all includes 4 switching tubes, a DC capacitor C and
Individual discharge resistance R, described switching tube can use controlled shutoff device (IGBT) or bidirectional thyristor, adopt in figure
Connect the colelctor electrode of T3 with the emitter stage of 4 IGBT T1-T4, described T1, the emitter stage of T2 connects T4's
Colelctor electrode, and the colelctor electrode of T1 and T2 connects the positive pole of DC capacitor C jointly, the negative pole of DC capacitor C divides
Not Lian Jie the emitter stage of T3 and T4, described discharge resistance R is attempted by the two ends of DC capacitor C.Described T1
Drawing the terminal input as serial module structure with the tie point of T3, the tie point of T2 and T4 draws one
Individual terminal is as the output of serial module structure, and the output of described each serial module structure is connected with rear adjacent mould successively
The input of block connects, and der group becomes cascaded structure, forms convertor equipment based on serial module structure topology.
The improvement of the present invention is: circulate the serial module structure in whole topological structure as redundancy mould successively
Block, carries out bypass process: valve base controls device and issues the bypass commands series connection mould to wherein one or more modules
Block internal control plate, serial module structure internal control plate directly controls the controllable devices pulse of serial module structure, makes this mould
It is standby that block is in bypass condition, redundancy；After certain interval of time, valve base controls device withdrawal and issues this module
Bypass commands, and issue the bypass commands serial module structure internal control plate to next or multiple modules, it is achieved depend on
Secondary shift cycle redundancy.
Redundant module in whole topological structure is in certain module dynamic circulation rather than fixing.Profit
Directly issue the pulse of cyclic shift with control device, directly control multiple controllable devices of serial module structure.
Above-mentioned interval time, span was 0.1ms～200ms.Owing to interval time is the shortest, each module
DC voltage is held at controlling value, thus improves the equipment security reliability of convertor equipment.
Above-mentioned serial module structure is the elementary cell of chain static synchronous compensator under each electric pressure.
In Fig. 1, the basic structure of each serial module structure be by 4 IGBT (T1～T4), 1 DC capacitor C,
1 discharge resistance R and internal control plate composition, as a example by being applied to 10kV system, A is in series number of modules
Being 12, wherein redundant module 1, Ga1～Ga12 is that A is in series the driving signal of module.Assume to work as
Front redundant module is 12#, and now 1#～11# module carries out phase shift modulation according to sine wave, and 12# module drive is
Bypass pulse, i.e. T1 and T2 turns on, electric current electric capacity is not carried out discharge and recharge.It is spaced through a circulation timei
T, span is at 0.1ms～200ms, and redundant instruction is recycled to 1# module, now 2#～12# module according to
Sine wave carries out phase shift modulation, and the DC voltage of 1# module discharges via discharge resistance R, owing to discharge time is normal
Number is far longer than and is spaced T circulation timei, so the DC voltage of redundant module is substantially free of change.
In Fig. 2, list A phase each serial module structure optimal PWM sequential of 10kV system, t0 table in figure
Showing arbitrary initial time, Ts represents switching frequency, use phase shift carrier Control mode Ts/22 be one basic
Phase shift interval time, T represents that circulation timei is spaced.#A1 module does not has time delay, #A2 mould in t0 moment pulse
Block time delay 1 phase shift interval time, #A12 module time delay 12*1 phase shift interval time, circulate at the next one
When time interval T arrives, phase shift time interval adds 1, i.e. #A1 module is in t0+T moment pulse delay 1 shifting
Time separately, #A2 module time delay 2 phase shift interval time, #A12 module time delay 0 phase shift interval time.
By that analogy, it is spaced T through 12 circulation timeis and completes A phase each serial module structure optimal PWM.
In Fig. 3, the static reacance generator listing 10kV absorbs the RTDS of 6Mvar under cyclic redundancy control
Result of the test, a) shows the track that A phase cyclic redundancy module is numbered, and 12 serial module structures sequentially enter superfluous
Remaining bypass condition；B) the DC voltage fluctuation situation of now A phase 1# module is shown, by 1# module redundancy
During road (in corresponding a, numerical value is a section of zero), this module voltage is constant, as schemed the part of level in b, its
Remaining moment 1# module is in running order, there is the discharge and recharge of electric capacity, the friendship of superposition 100Hz on DC voltage
Stream pulsation；C) show A phase all modules voltage and, it appeared that voltage and value are also on DC voltage
, there is not the fluctuation of sudden change, fully meets the control needs under normal mode in superposition 100Hz AC ripple.
In Fig. 4, the static reacance generator listing 10kV controls to issue the RTDS of 10Mvar at cyclic redundancy
Result of the test, A phase 1# module failure during 500ms, a) show that 1# module DC voltage is opened due to bypass
Beginning to decline, remaining module DC voltage still follow current fluctuates；B) electricity of equipment output before and after fault is shown
Pressure and electric current are undistorted, the phenomenon of rush of current do not occur；C) show equipment output before and after fault has
, there are not unusual fluctuations in merit and idle.
Fig. 3 and Fig. 4 illustrates, a kind of employing cyclic redundancy technology that the present invention provides improves series connection chain type unsteady flow and sets
The method of standby dynamic response, the whole impact solved when redundant module puts into and overshoot problem, improve equipment
Operation state response performance, and avoid the system voltage rush of current to equipment.
Finally should be noted that: combine above-described embodiment and only technical scheme is described rather than to its limit
System.Those of ordinary skill in the field are to be understood that: those skilled in the art can concrete to the present invention
Embodiment is modified or equivalent, but the claim protection that these amendments or change are all awaited the reply in application
Among scope.
Above example is only the technological thought that the present invention is described, it is impossible to limit protection scope of the present invention with this,
Every technological thought proposed according to the present invention, any change done on the basis of technical scheme, each fall within this
Within invention protection domain.
Claims (3)
1. the method improving series connection chain type convertor equipment dynamic response, convertor equipment based on serial module structure
Topology, described topology includes at least 2 serial module structures being sequentially connected in series, and each serial module structure all includes 4 switches
Pipe, a DC capacitor and a discharge resistance, the emitter stage of the first switching tube connects the current collection of the 3rd switching tube
Pole, the colelctor electrode of emitter stage connection the 4th switching tube of second switch pipe, and the colelctor electrode of first and second switching tube
The common positive pole connecting DC capacitor, the negative pole of DC capacitor connects the emitter stage of third and fourth switching tube respectively,
Described discharge resistance is attempted by the two ends of DC capacitor；The tie point of described first and third switching tube draws an end
Son is as the input of serial module structure, and the tie point of second, four switching tubes draws a terminal as serial module structure
Output, described each serial module structure be linked in sequence formation convertor equipment based on serial module structure topology；Its feature
It is: the serial module structure in whole topological structure is circulated successively as redundant module, carries out bypass process: valve
Base controls device and issues bypass commands to wherein one or more serial module structure internal control plates, inside serial module structure
Control panel directly controls the controllable devices pulse of serial module structure, makes this redundant module be in bypass condition, redundancy standby
With；After certain interval of time, valve base controls device and regains the bypass commands issuing this redundant module, and issues side
Road order is to next or multiple serial module structure internal control plates, it is achieved shift cycle redundancy successively.
A kind of method improving series connection chain type convertor equipment dynamic response the most as claimed in claim 1, it is special
Levy and be: described interval time, span was 0.1ms～200ms.
A kind of method improving series connection chain type convertor equipment dynamic response the most as claimed in claim 1, it is special
Levy and be: the switching tube in described each serial module structure uses controlled shutoff device or bidirectional thyristor.
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| CN108347158B (en) | 2017-01-25 | 2021-06-15 | 通用电气公司 | Circuit protection system and method |
| CN109004814B (en) * | 2018-08-13 | 2020-03-24 | 南昌工程学院 | Submodule capacitor voltage balance control system for MMC |
| CN109039124B (en) * | 2018-08-13 | 2020-06-09 | 南昌工程学院 | MMC capacitor voltage balance control method based on phase-shift space vector modulation |
| CN114094834A (en) * | 2021-10-29 | 2022-02-25 | 深圳供电局有限公司 | Switched capacitor access type direct current transformer and control method thereof |
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| CN101268606A (en) * | 2005-09-21 | 2008-09-17 | 西门子公司 | Control process for redundancy use in the event of a fault of a polyphase power converter having distributed energy stores |
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