CN107591823A - A kind of angle-style chain type SVG and its compensating control method - Google Patents
A kind of angle-style chain type SVG and its compensating control method Download PDFInfo
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- CN107591823A CN107591823A CN201711029790.6A CN201711029790A CN107591823A CN 107591823 A CN107591823 A CN 107591823A CN 201711029790 A CN201711029790 A CN 201711029790A CN 107591823 A CN107591823 A CN 107591823A
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Abstract
The invention provides a kind of angle-style chain type SVG, the SVG is that a kind of series filtering formula cascades SVG, including three branch roads being in series by Cascade H bridge chain and filter inductance, three branch roads connect into triangular net；Three tie points of the triangular net access power network by the filter capacitor and/or filter inductance of series connection, and the Cascade H bridge chain includes the unit module of multiple series connection.Present invention also offers the compensating control method of SVG applications, and using the front and rear current waveform of present invention contrast compensation, the practical proof validity of the invention compensated.
Description
Technical field
The present invention relates to cascade STATCOM (Static Var Generator, SVG), a kind of especially angle-style
Chain type SVG and its compensating control method.
Background technology
Substantial amounts of uneven industrial load and some single-phase Large Copacity loads, such as industry exchange in power system be present
Electric arc furnaces, electric railway etc..Idle and negative-sequence current caused by these uncompensated loads causes the loss of system power, and
And be on the rise, threaten safety and the economical operation of power system.Suitable for the negative sequence compensation scheme point of mesohigh power distribution network
For two classes：Energy circulation type current transformer scheme, idle and negative phase-sequence comprehensive benefit is carried out using the current transformer with public direct-current side
Repay, with railway power regulator (Railway Power Conditioner, RPC) and isolated form static reacance generator for generation
Table, isolating transformer is required to, has influence on device volume, weight and cost；Angle-style Scheme of Reactive Power Compensation, according to Steinmetz
Principle, the idle and comprehensive compensation of negative phase-sequence is carried out using pure idle branch, with the angle-style SVC based on IGCT
(Static Var Compensator, SVC) and angle-style chain type SVG are representative.In angle-style Scheme of Reactive Power Compensation, SVC is using brilliant
Brake tube serial connection technology, mesohigh power distribution network can be directly hung on, but it is based on phase control techniques, and response speed is slow, can produce a large amount of humorous
Ripple electric current.Chain type SVG uses cascading multiple electrical level technology, can directly be hung on mesohigh power distribution network, is a kind of preferably compensation side
Case, there is advantages below：Fast response time；The comprehensive regulation of idle negative phase-sequence harmonic can be carried out；Using cascade connection multi-level knot
Structure, devices switch frequency is low, and running wastage is small, is easy to modularization, is easy to extend.
In angle-style Scheme of Reactive Power Compensation, relied on frequently with based on Steinmetz principles, this method based on Periodic Mean
Phasor it is theoretical, method applicability is bad, and algorithm is complicated, precision is not high.
The content of the invention
One aspect of the present invention provides a kind of angle-style chain type SVG, and the SVG is that a kind of series filtering formula cascades SVG, including
Three branch roads being in series by Cascade H bridge chain and filter inductance, three branch roads connect into triangular net；The triangle
Three tie points of network access power network by the filter capacitor and filter inductance of series connection, and the Cascade H bridge chain includes multiple
The unit module of series connection.
Meanwhile it also offers a kind of angle-style chain type SVG compensating control method, it is characterised in that comprises the following steps：
1) the DC capacitor voltage value of a phase Cascade H bridge chain each unit modules is detected, it is straight to ask for a phase Cascade H bridge chains
Flow the normalizing value uavea of lateral capacitance magnitude of voltage：Uaveab=∑s udaby/N, uavebc=∑ udbcy/N, uaveca=∑
udcay/N；Wherein uday represents the DC voltage value of y-th of unit module of a phase Cascade H bridge chains respectively, and N is per phase level
The unit module cascade quantity of connection type H bridge chains；Then the normalizing value of all unit module total voltages of a phase Cascade H bridge chains is tried to achieve：
Uave=(uaveab+uavebc+uaveca)/3；Wherein, a ∈ [ab, bc, ca], ab, bc, ca represent SVG three-phase respectively；
2) DC voltage reference signal u* and uave is subtracted each other, then carries out PI regulations, export IP, by IP and ab, bc,
The voltage follow signal syna of ca three-phases is multiplied, and obtains ab, bc, the regulating command ipa of the DC voltage of ca three-phases；
3) uave is subtracted each other with ab, bc, the DC capacitor voltage normalizing value uavea of ca three-phase Cascade H bridge chains respectively,
Then PI regulations are carried out, export IZa, IZa is multiplied with ab, bc, the voltage follow signal syna of ca three-phases respectively, obtains three-phase level
The DC voltage regulating command iZa of connection type H bridge chains；
4) by DC voltage regulating command ipa and desired three-phase is idle and zero sequence command signalIZa, Iref are successively
After superposition, the current inner loop reference instruction signal of three-phase Cascade H bridge chain is obtainedI.e.：Wherein
The DC loop-current reference that the voltage balancing control of Cascade H bridge chain is superimposed in SVG when Iref represents to realize compensation zero-sequence current
Signal；
5) by current inner loop reference instruction signalSubtract each other with the three-phase output current ia detected, obtain current tracking mistake
Difference signal Δ ia；Current track error signal is adjusted through overcurrent controller, obtains ab, bc, the tune of ca three-phase Cascade H bridge chains
Ripple signal ura processed；
6) by each phase DC voltage normalizing value uavea respectively with y-th of unit module DC capacitor voltage in this phase
Uday subtracts each other, and the error after subtracting each other carries out P regulations, is then multiplied with the output current ia of this phase, obtains y-th of unit of this phase
The DC voltage regulating command Δ uay of module；
7) tune of this phase that the DC voltage regulating command Δ uay of y-th of unit module of Cascade H bridge chain is added to
On ripple signal ura processed, the actual modulated ripple signal may of y-th of unit module of this phase is obtained；
8) ab, the actual modulated ripple signal may of bc, ca y-th of unit of each phase are sent into phase shift carrier modulation unit, obtained
The pwm signal of ab, bc, ca three-phase unit module, driving power switching tube export desired voltage and current signal.
Brief description of the drawings
Fig. 1 is the angle-style chain type SVG connection figures of one embodiment of the invention.
Embodiment
Embodiment one.
One aspect of the present invention provides a kind of angle-style chain type SVG, and the SVG is that a kind of series filtering formula cascades SVG, including
Three branch roads being in series by Cascade H bridge chain and filter inductance, three branch roads connect into triangular net；The triangle
Three tie points of network access power network by the filter inductance (referring to Fig. 1) of series connection, and the Cascade H bridge chain includes multiple strings
The unit module of connection.
Its compensating control method comprises the following steps：
1) the DC capacitor voltage value of a phase Cascade H bridge chain each unit modules is detected, it is straight to ask for a phase Cascade H bridge chains
Flow the normalizing value uavea of lateral capacitance magnitude of voltage：Uaveab=∑s udaby/N, uavebc=∑ udbcy/N, uaveca=∑
udcay/N；Wherein uday represents the DC voltage value of y-th of unit module of a phase Cascade H bridge chains respectively, and N is per phase level
The unit module cascade quantity of connection type H bridge chains；Then the normalizing value of all unit module total voltages of a phase Cascade H bridge chains is tried to achieve：
Uave=(uaveab+uavebc+uaveca)/3；Wherein, a ∈ [ab, bc, ca], ab, bc, ca represent SVG three-phase respectively；
2) DC voltage reference signal u* and uave is subtracted each other, then carries out PI regulations, export IP, by IP and ab, bc,
The voltage follow signal syna of ca three-phases is multiplied, and obtains ab, bc, the regulating command ipa of the DC voltage of ca three-phases；
3) uave is subtracted each other with ab, bc, the DC capacitor voltage normalizing value uavea of ca three-phase Cascade H bridge chains respectively,
Then PI regulations are carried out, export IZa, IZa is multiplied with ab, bc, the voltage follow signal syna of ca three-phases respectively, obtains three-phase level
The DC voltage regulating command iZa of connection type H bridge chains；
4) by DC voltage regulating command ipa and desired three-phase is idle and zero sequence command signalIZa, Iref are successively
After superposition, the current inner loop reference instruction signal of three-phase Cascade H bridge chain is obtainedI.e.：Wherein
The DC loop-current reference that the voltage balancing control of Cascade H bridge chain is superimposed in SVG when Iref represents to realize compensation zero-sequence current
Signal；
5) by current inner loop reference instruction signalSubtract each other with the three-phase output current ia detected, obtain current tracking mistake
Difference signal Δ ia；Current track error signal is adjusted through overcurrent controller, obtains ab, bc, the tune of ca three-phase Cascade H bridge chains
Ripple signal ura processed；
6) by each phase DC voltage normalizing value uavea respectively with y-th of unit module DC capacitor voltage in this phase
Uday subtracts each other, and the error after subtracting each other carries out P regulations, is then multiplied with the output current ia of this phase, obtains y-th of unit of this phase
The DC voltage regulating command Δ uay of module；
7) tune of this phase that the DC voltage regulating command Δ uay of y-th of unit module of Cascade H bridge chain is added to
On ripple signal ura processed, the actual modulated ripple signal may of y-th of unit module of this phase is obtained；
8) ab, the actual modulated ripple signal may of bc, ca y-th of unit of each phase are sent into phase shift carrier modulation unit, obtained
The pwm signal of ab, bc, ca three-phase unit module, driving power switching tube export desired voltage and current signal.
Embodiment two.
One aspect of the present invention provides a kind of angle-style chain type SVG, and the SVG is that a kind of series filtering formula cascades SVG, including
Three branch roads being in series by Cascade H bridge chain and filter inductance, three branch roads connect into triangular net；The triangle
Three tie points of network access power network by the filter capacitor of series connection, and the Cascade H bridge chain includes the unit of multiple series connection
Module.Its compensating control method comprises the following steps：
1) the DC capacitor voltage value of a phase Cascade H bridge chain each unit modules is detected, it is straight to ask for a phase Cascade H bridge chains
Flow the normalizing value uavea of lateral capacitance magnitude of voltage：Uaveab=∑s udaby/N, uavebc=∑ udbcy/N, uaveca=∑
udcay/N；Wherein uday represents the DC voltage value of y-th of unit module of a phase Cascade H bridge chains respectively, and N is per phase level
The unit module cascade quantity of connection type H bridge chains；Then the normalizing value of all unit module total voltages of a phase Cascade H bridge chains is tried to achieve：
Uave=(uaveab+uavebc+uaveca)/3；Wherein, a ∈ [ab, bc, ca], ab, bc, ca represent SVG three-phase respectively；
2) DC voltage reference signal u* and uave is subtracted each other, then carries out PI regulations, export IP, by IP and ab, bc,
The voltage follow signal syna of ca three-phases is multiplied, and obtains ab, bc, the regulating command ipa of the DC voltage of ca three-phases；
3) uave is subtracted each other with ab, bc, the DC capacitor voltage normalizing value uavea of ca three-phase Cascade H bridge chains respectively,
Then PI regulations are carried out, export IZa, IZa is multiplied with ab, bc, the voltage follow signal syna of ca three-phases respectively, obtains three-phase level
The DC voltage regulating command iZa of connection type H bridge chains；
4) by DC voltage regulating command ipa and desired three-phase is idle and zero sequence command signalIZa, Iref are successively
After superposition, the current inner loop reference instruction signal of three-phase Cascade H bridge chain is obtainedI.e.：Wherein
The DC loop-current reference that the voltage balancing control of Cascade H bridge chain is superimposed in SVG when Iref represents to realize compensation zero-sequence current
Signal；
5) by current inner loop reference instruction signalSubtract each other with the three-phase output current ia detected, obtain current tracking mistake
Difference signal Δ ia；Current track error signal is adjusted through overcurrent controller, obtains ab, bc, the tune of ca three-phase Cascade H bridge chains
Ripple signal ura processed；
6) by each phase DC voltage normalizing value uavea respectively with y-th of unit module DC capacitor voltage in this phase
Uday subtracts each other, and the error after subtracting each other carries out P regulations, is then multiplied with the output current ia of this phase, obtains y-th of unit of this phase
The DC voltage regulating command Δ uay of module；
7) tune of this phase that the DC voltage regulating command Δ uay of y-th of unit module of Cascade H bridge chain is added to
On ripple signal ura processed, the actual modulated ripple signal may of y-th of unit module of this phase is obtained；
8) ab, the actual modulated ripple signal may of bc, ca y-th of unit of each phase are sent into phase shift carrier modulation unit, obtained
The pwm signal of ab, bc, ca three-phase unit module, driving power switching tube export desired voltage and current signal.
Embodiment two.
One aspect of the present invention provides a kind of angle-style chain type SVG, and the SVG is that a kind of series filtering formula cascades SVG, including
Three branch roads being in series by Cascade H bridge chain and filter inductance, three branch roads connect into triangular net；The triangle
Three tie points of network access power network by the filter capacitor and inductance of series connection, and the Cascade H bridge chain includes multiple series connection
Unit module.
Its compensating control method comprises the following steps：
1) the DC capacitor voltage value of a phase Cascade H bridge chain each unit modules is detected, it is straight to ask for a phase Cascade H bridge chains
Flow the normalizing value uavea of lateral capacitance magnitude of voltage：Uaveab=∑s udaby/N, uavebc=∑ udbcy/N, uaveca=∑
udcay/N；Wherein uday represents the DC voltage value of y-th of unit module of a phase Cascade H bridge chains respectively, and N is per phase level
The unit module cascade quantity of connection type H bridge chains；Then the normalizing value of all unit module total voltages of a phase Cascade H bridge chains is tried to achieve：
Uave=(uaveab+uavebc+uaveca)/3；Wherein, a ∈ [ab, bc, ca], ab, bc, ca represent SVG three-phase respectively；
2) DC voltage reference signal u* and uave is subtracted each other, then carries out PI regulations, export IP, by IP and ab, bc,
The voltage follow signal syna of ca three-phases is multiplied, and obtains ab, bc, the regulating command ipa of the DC voltage of ca three-phases；
3) uave is subtracted each other with ab, bc, the DC capacitor voltage normalizing value uavea of ca three-phase Cascade H bridge chains respectively,
Then PI regulations are carried out, export IZa, IZa is multiplied with ab, bc, the voltage follow signal syna of ca three-phases respectively, obtains three-phase level
The DC voltage regulating command iZa of connection type H bridge chains；
4) by DC voltage regulating command ipa and desired three-phase is idle and zero sequence command signalIZa, Iref are successively
After superposition, the current inner loop reference instruction signal of three-phase Cascade H bridge chain is obtainedI.e.：Wherein
The DC loop-current reference that the voltage balancing control of Cascade H bridge chain is superimposed in SVG when Iref represents to realize compensation zero-sequence current
Signal；
5) by current inner loop reference instruction signalSubtract each other with the three-phase output current ia detected, obtain current tracking mistake
Difference signal Δ ia；Current track error signal is adjusted through overcurrent controller, obtains ab, bc, the tune of ca three-phase Cascade H bridge chains
Ripple signal ura processed；
6) by each phase DC voltage normalizing value uavea respectively with y-th of unit module DC capacitor voltage in this phase
Uday subtracts each other, and the error after subtracting each other carries out P regulations, is then multiplied with the output current ia of this phase, obtains y-th of unit of this phase
The DC voltage regulating command Δ uay of module；
7) tune of this phase that the DC voltage regulating command Δ uay of y-th of unit module of Cascade H bridge chain is added to
On ripple signal ura processed, the actual modulated ripple signal may of y-th of unit module of this phase is obtained；
8) ab, the actual modulated ripple signal may of bc, ca y-th of unit of each phase are sent into phase shift carrier modulation unit, obtained
The pwm signal of ab, bc, ca three-phase unit module, driving power switching tube export desired voltage and current signal.
From practice and the experiment of the present invention as can be seen that load current has phase difference with voltage, asymmetrical three-phase, contain
Harmonic components, power quality problem protrude；Current on line side and line voltage same-phase after compensation, three-phase symmetrical, harmonic content
Reduce, close to unity power factor.Contrast compensation front and rear current waveform, practical proof effectiveness of the invention.
Claims (2)
1. a kind of angle-style chain type SVG, the SVG, which are a kind of series filtering formula, cascades SVG, including three by Cascade H bridge chain and
The branch road that filter inductance is in series, three branch roads connect into triangular net；Three tie points of the triangular net lead to
The filter capacitor and/or filter inductance access power network, the Cascade H bridge chain for crossing series connection include the unit module of multiple series connection.
2. a kind of angle-style chain type SVG compensating control method, it is used for angle-style chain type SVG as claimed in claim 1, its feature
It is, comprises the following steps：
1) the DC capacitor voltage value of a phase Cascade H bridge chain each unit modules is detected, asks for a phase Cascade H bridge chain DC sides
The normalizing value u of capacitance voltage valueavea：uaveab=∑ udaby/ N, uavebc=∑ udbcy/ N, uaveca=∑ udcay/N；Wherein udayPoint
Not Biao Shi a phase Cascade H bridge chains y-th of unit module DC voltage value, N is the unit mould per phase Cascade H bridge chain
Block cascades quantity；Then the normalizing value of all unit module total voltages of a phase Cascade H bridge chains is tried to achieve：uave=(uaveab+uavebc+
uaveca)/3；Wherein, a ∈ [ab, bc, ca], ab, bc, ca represent SVG three-phase respectively；
2) by DC voltage reference signal u*With uaveSubtract each other, then carry out PI regulations, export IP, by IPWith ab, bc, ca three-phases
Voltage follow signal synaIt is multiplied, obtains ab, bc, the regulating command i of the DC voltage of ca three-phasespa；
3) by uaveRespectively with ab, bc, the DC capacitor voltage normalizing value u of ca three-phase Cascade H bridge chainsaveaSubtract each other, Ran Houjin
Row PI is adjusted, and exports IZa, IZaRespectively with ab, bc, the voltage follow signal syn of ca three-phasesaIt is multiplied, obtains three-phase Cascade H bridge
The DC voltage regulating command i of chainZa；
4) by DC voltage regulating command ipaWith desired three-phase is idle and zero sequence command signaliZa、IrefIt is sequentially overlapped it
Afterwards, the current inner loop reference instruction signal of three-phase Cascade H bridge chain is obtainedI.e.：Wherein IrefTable
Show the DC loop-current reference signal that the voltage balancing control of Cascade H bridge chain when realizing compensation zero-sequence current is superimposed in SVG；
5) by current inner loop reference instruction signalWith the three-phase output current i detectedaSubtract each other, obtain current track error signal
Δia；Current track error signal is adjusted through overcurrent controller, obtains ab, bc, the modulating wave letter of ca three-phase Cascade H bridge chains
Number ura；
6) by each phase DC voltage normalizing value uaveaRespectively with y-th of unit module DC capacitor voltage u in this phasedayPhase
Subtract, error after subtracting each other carries out P regulations, then with the output current i of this phaseaIt is multiplied, obtains y-th of unit module of this phase
DC voltage regulating command Δ uay；
7) by the DC voltage regulating command Δ u of y-th of unit module of Cascade H bridge chainayThe modulating wave of this phase that is added to
Signal uraOn, obtain the actual modulated ripple signal m of y-th of unit module of this phaseay；
8) by ab, the actual modulated ripple signal m of bc, ca y-th of unit of each phaseayPhase shift carrier modulation unit is sent into, obtains ab,
The pwm signal of bc, ca three-phase unit module, driving power switching tube export desired voltage and current signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446868A (en) * | 2020-05-07 | 2020-07-24 | 福州大学 | Self-coupling power electronic transformer circuit topology and control method thereof |
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|---|---|---|---|---|
| CN102624006A (en) * | 2012-03-29 | 2012-08-01 | 湖南大学 | Control method for single-phase cascade type static synchronous compensator |
| CN102842912A (en) * | 2012-09-12 | 2012-12-26 | 湖南大学 | Single carrier control method applicable to cascaded SVG |
| CN103151783A (en) * | 2013-04-09 | 2013-06-12 | 马伏军 | Three-phase high-voltage cascading mixing power compensator and control method thereof |
| CN104135015A (en) * | 2014-07-12 | 2014-11-05 | 中国矿业大学 | Soft starting method improved based on H-bridge cascade STATCOM (Static Synchronous Compensator) |
| CN105356479A (en) * | 2015-11-13 | 2016-02-24 | 湖南大学 | C-type series filtering cascaded SVG and negative sequence compensation control method thereof |
-
2017
- 2017-10-27 CN CN201711029790.6A patent/CN107591823A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624006A (en) * | 2012-03-29 | 2012-08-01 | 湖南大学 | Control method for single-phase cascade type static synchronous compensator |
| CN102842912A (en) * | 2012-09-12 | 2012-12-26 | 湖南大学 | Single carrier control method applicable to cascaded SVG |
| CN103151783A (en) * | 2013-04-09 | 2013-06-12 | 马伏军 | Three-phase high-voltage cascading mixing power compensator and control method thereof |
| CN104135015A (en) * | 2014-07-12 | 2014-11-05 | 中国矿业大学 | Soft starting method improved based on H-bridge cascade STATCOM (Static Synchronous Compensator) |
| CN105356479A (en) * | 2015-11-13 | 2016-02-24 | 湖南大学 | C-type series filtering cascaded SVG and negative sequence compensation control method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446868A (en) * | 2020-05-07 | 2020-07-24 | 福州大学 | Self-coupling power electronic transformer circuit topology and control method thereof |
| CN111446868B (en) * | 2020-05-07 | 2021-06-22 | 福州大学 | Self-coupling power electronic transformer circuit topology and control method thereof |
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Application publication date: 20180116 |