CN109672151A - A kind of flexible ring net controller under island state with the fitting method of harmonics - Google Patents
A kind of flexible ring net controller under island state with the fitting method of harmonics Download PDFInfo
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- CN109672151A CN109672151A CN201710950146.6A CN201710950146A CN109672151A CN 109672151 A CN109672151 A CN 109672151A CN 201710950146 A CN201710950146 A CN 201710950146A CN 109672151 A CN109672151 A CN 109672151A
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- overcurrent protection
- sections
- bridge arm
- alternating current
- inverter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Protection Of Static Devices (AREA)
Abstract
The present invention disclose a kind of flexible ring net controller under island state with the fitting method of harmonics; inverter output size of current and alternating current circuit overcurrent protection movement definite value are cooperated; after detection connection fault in ac transmission system; it sets the limitation of Inverter circuit output order and is more than or equal to alternating current circuit overcurrent protection II number of segment value, and be less than overcurrent protection I number of segment value；Overcurrent protection I sections of definite value settings in alternating current circuit are lower than I sections of definite values of converter bridge arm overcurrent protection; overcurrent protection II sections of definite value settings in proximal end alternating current circuit are higher than II sections of definite values of converter bridge arm overcurrent protection; II sections of converter bridge arm overcurrent protection are used as standby; II sections of the overcurrent protection of distal end alternating current circuit settings are lower than II sections of definite values of converter bridge arm overcurrent protection, and II sections of converter bridge arm overcurrent protection are used as remote standby.Such method can cut off failure using harmonics, while not influencing inverter under fault condition and running.
Description
Technical field
The invention belongs to direct current transportation field, in particular to a kind of flexible ring net controller operates in failure under island state
Current limited Control and protection cooperation method.
Background technique
Voltage source converter type direct current transportation (voltage source converter based high voltage
Direct current, VSC-HVDC) using power electronic devices can be turned off, commutation can be realized without external power supply,
Therefore has the ability powered to passive network.In operation of power networks, for the power supply reliability for enhancing important load, it can be used soft straight
It supplies power with double circuit with alternating current circuit for important load, supplies power with double circuit under normal circumstances, it is single by soft straight or alternating current circuit in special circumstances
Road powers, when using soft straight independent power supply mode, when exchange side is broken down, and the excision event of harmonics tripping faulty line
Barrier, soft lineal system hold continuous service, but in special circumstances, and soft lineal system does not cooperate with harmonics and soft straight isolated island fortune
There is no current limiting measures in row situation, in fact it could happen that first tripping is exited under soft lineal system external area error, harmonics be failure to actuate or
After act, do not make full use of soft straight inverter instantaneous overload and output current limit capability, formed alternating current-direct current protection between
Cooperation, harmonics are generally arranged I, II sections or III sections of overcurrent protection, soft straight inverter have I, II sections of bridge arm overcurrent protection or
III sections of person, is cooperated by definite value between setting AC/DC overcurrent protection, in inverter external area error, can use inverter
Current limit capability is exported, given size of current is exported when reaching failure, partial short circuit electric current is provided, on the one hand can use friendship
Stream protection excision failure, on the other hand nor affects on inverter under fault condition and runs.
Chinese patent " a kind of flexible HVDC transmission system from the smooth-switching method for switching to isolated operation side by side ", application number
201310220297.8: flexible HVDC transmission system being detected by system electrical amount variation characteristic and is in alternating current-direct current paired running mould
Formula or isolated operation mode, and automatically by control mode switch to being corresponding to it after judgement system is in decoupled mode
Control strategy, but do not tell about break down under isolated operation mode after and harmonics cooperation." MMC-HVDC networking and orphan
Island running state conversion strategy " 2015,35 (9): mono- text of 2152-2161 teaches soft lineal system in connected state and island state
Between stablize switching strategy, but without reference to protection failure lower control limit stream method and AC system protection cooperation mode.
Summary of the invention
The purpose of the present invention is to provide a kind of cooperation side of flexible ring net controller under island state with harmonics
Method cuts off failure using harmonics, while not influencing inverter under fault condition and running.
In order to achieve the above objectives, solution of the invention is:
A kind of flexible ring net controller under island state with the fitting method of harmonics, including following content: the change of current
Device output size of current and alternating current circuit overcurrent protection movement definite value are cooperated, and fit system is detection connection AC system event
After barrier, setting Inverter circuit output order limitation Imax is more than or equal to alternating current circuit overcurrent protection II number of segment value, and is less than
Stream protection I number of segment value；Overcurrent protection I sections of definite value settings in alternating current circuit are lower than I sections of definite values of converter bridge arm overcurrent protection, and proximal end is handed over
II sections of definite value settings of Flow Line overcurrent protection are higher than II sections of definite values of converter bridge arm overcurrent protection, are delayed compared with converter bridge arm overcurrent
Protection is II sections short, and II sections of converter bridge arm overcurrent protection are used as standby, and the change of current is compared in II sections of the overcurrent protection of distal end alternating current circuit settings
II sections of definite values of device bridge arm overcurrent protection are low, and II sections of converter bridge arm overcurrent protection are used as remote standby；Alternating current circuit overcurrent protection III
Section definite value is set as inverter chromic trouble running current limitation numerical value, and III sections of alternating current circuit overcurrent protection delays are compared with inverter
III sections of bridge arm overcurrent protection short, III sections of converter bridge arm overcurrent protection are used as the great distance standby of distal end AC line.
Real-time detection voltage on line side amplitude size, once detection low-voltage state, it is believed that it is that alternating current circuit is broken down,
Imax allows to export electric current multiple from inverter under normal circumstances and is switched to AC line protection II sections or III number of segment under failure
Value.
After the failure vanishes of inverter line side, current-order limitation Imax restores to inverter under normal circumstances to allow to export
Electric current multiple judges the method for net side failure vanishes for UL≥UN, UNFor voltage rating.
Outer ring integral action is controlled using voltage on line side, so that current-order is rapidly reached limitation under low voltage condition
Imax。
The value range of Imax is 0.0~1.5 under fault condition.
Above-mentioned Imax allows to export electric current multiple from inverter under normal circumstances and is switched to AC line protection II under failure
The method of section or III number of segment value is: presetting n group (ULj, Imaxj) two Dimension Numerical Value series or curve, ULFor net side electricity
Pressure, j=1,2 ... n, according to current detection ULjSize obtains limit value Imax using interpolation method or look-up method.
It limits current to instructIt is instructed as inner ring current controller input current.
After adopting the above scheme, the invention has the benefit that
(1) flexible ring net controller instantaneous overload and output current limit capability are made full use of, alternating current-direct current protection is formed
Between cooperate, can use inverter output current limit capability, exported when reaching failure to constant current, provide partial short circuit electricity
On the one hand stream can use harmonics excision failure, on the other hand nor affect on inverter under fault condition and run；
(2) cooperated by the overcurrent protection of flexible ring net controller bridge arm and harmonics, near terminal fault passes through alternating current circuit
I sections of quick-actions of protection quickly cut off failure, converter bridge arm overcurrent protection and distal line protection cooperation, as island operation state
Lower distal line protects remote standby, can make full use of inverter overload capacity in this way, and inverter is after reforwarding after cutting off far-end fault
Row.
Detailed description of the invention
Inverter Current limited Control scheme schematic diagram when Fig. 1 is flexible ring net controller isolated operation；
Fig. 2 is flexible ring net controller inner ring current limit Imax according to alternating voltage ULHandoff relation curve graph.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail.
The present invention provide a kind of flexible ring net controller under island state with the fitting method of harmonics, flexible looped network
When controller connects AC system isolated operation, size of current is exported by limitation inverter when AC system breaks down and is reached
Partial short circuit electric current is provided, corresponding inverter is switched according to current alternating voltage detected amplitude and is exported, is cut by harmonics
Except alternating current circuit failure, while inverter normal operation is not influenced again, Imax restores to normal condition after exchanging side failure removal
Lower inverter allows to export electric current multiple.
Particular content of the invention is: inverter output size of current and alternating current circuit overcurrent protection movement definite value are matched
It closes, fit system is that setting Inverter circuit output order limitation Imax, which is more than or equal to, to be handed over after detection connects fault in ac transmission system
Flow Line overcurrent protection II number of segment value, and it is less than overcurrent protection I number of segment value.Overcurrent protection I sections of definite value setting ratios in alternating current circuit change
It is low to flow I sections of definite values of device bridge arm overcurrent protection, I sections of consideration inverter momentary overload capacities of converter bridge arm overcurrent protection, proximal end is handed over
II sections of definite value settings of Flow Line overcurrent protection are higher than II sections of definite values of converter bridge arm overcurrent protection, are delayed compared with converter bridge arm overcurrent
Protection is II sections short, and II sections of converter bridge arm overcurrent protection are used as standby, and the change of current is compared in II sections of the overcurrent protection of distal end alternating current circuit settings
II sections of definite values of device bridge arm overcurrent protection are low, and II sections of converter bridge arm overcurrent protection are used as remote standby.
Overcurrent protection III sections of definite values in alternating current circuit are set as inverter chromic trouble running current limitation numerical value, AC line
III sections of road overcurrent protection delays are short compared with III sections of converter bridge arm overcurrent protection, and III sections of converter bridge arm overcurrent protection as remote
Hold the standby of AC line great distance.
Control system real-time detection voltage on line side amplitude size, once detection low-voltage state, i.e. UL≤0.8UN, UNFor volume
Constant voltage, then it is assumed that be that alternating current circuit is broken down, Imax allows to export electric current multiple from inverter under normal circumstances and is switched to
AC line protection II sections or III number of segment value under failure.After the failure vanishes of inverter line side, current-order limits Imax
Restore to inverter under normal circumstances to allow to export electric current multiple, judges the method for net side failure vanishes for UL≥UN。
It is controlled and is inputted as outer ring PI using alternating voltage, as shown in Figure 1, being made using voltage on line side control outer ring integral
With it is fast to be conducive under failure inverter output size of current so that current-order is rapidly reached limitation Imax under low voltage condition
Speed reaches II sections of AC line protection or III number of segment value.Imax value range is 0.0~1.5 under fault condition.
The method for being switched to failure Imax from normal Imax is as shown in Figure 2: presetting n group (ULj, Imaxj) (j=1,
2 ... n) two Dimension Numerical Value series or curve, ULFor voltage on line side, Imax allows to export electric current times from inverter under normal circumstances
Number is switched under failure AC line protection II sections or III sections of numerical methods, according to current detection ULjSize uses interpolation
Mode or look-up method obtain limit value Imax.
In the present embodiment, current limit instructsIt is instructed as inner ring current controller input current.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (7)
1. a kind of flexible ring net controller under island state with the fitting method of harmonics, it is characterised in that in following
Hold: inverter output size of current and alternating current circuit overcurrent protection movement definite value are cooperated, and fit system is that detection connection is handed over
After streaming system failure, setting Inverter circuit output order limitation Imax is more than or equal to alternating current circuit overcurrent protection II number of segment value,
And it is less than overcurrent protection I number of segment value；Overcurrent protection I sections of definite value settings in alternating current circuit are than I sections of definite values of converter bridge arm overcurrent protection
Low, overcurrent protection II sections of definite value settings in proximal end alternating current circuit are higher than II sections of definite values of converter bridge arm overcurrent protection, are delayed compared with the change of current
Device bridge arm overcurrent protection is II sections short, II sections of converter bridge arm overcurrent protection be used as standby, II sections of the overcurrent protection of distal end alternating current circuit
Setting is lower than II sections of definite values of converter bridge arm overcurrent protection, and II sections of converter bridge arm overcurrent protection are used as remote standby；Alternating current circuit
III sections of definite values of overcurrent protection are set as inverter chromic trouble running current limitation numerical value, and III sections of alternating current circuit overcurrent protection are prolonged
When it is short compared with III sections of converter bridge arm overcurrent protection, III sections of converter bridge arm overcurrent protection be used as the great distance standby of distal end AC line.
2. a kind of flexible ring net controller as described in claim 1 under island state with the fitting method of harmonics,
It is characterized in that: real-time detection voltage on line side amplitude size, once detection low-voltage state, it is believed that it is that alternating current circuit is broken down,
Imax allows to export electric current multiple from inverter under normal circumstances and is switched to AC line protection II sections or III number of segment under failure
Value.
3. a kind of flexible ring net controller as claimed in claim 2 under island state with the fitting method of harmonics,
Be characterized in that: after the failure vanishes of inverter line side, current-order limitation Imax restores to inverter under normal circumstances to allow defeated
Electric current multiple out judges the method for net side failure vanishes for UL≥UN, UNFor voltage rating.
4. a kind of flexible ring net controller as claimed in claim 2 under island state with the fitting method of harmonics,
It is characterized in that: outer ring integral action is controlled using voltage on line side, so that current-order is rapidly reached limitation under low voltage condition
Imax。
5. a kind of flexible ring net controller as claimed in claim 2 under island state with the fitting method of harmonics,
Be characterized in that: the value range of Imax is 0.0~1.5 under fault condition.
6. a kind of flexible ring net controller as claimed in claim 2 under island state with the fitting method of harmonics,
Be characterized in that: the Imax allows to export electric current multiple from inverter under normal circumstances and is switched to AC line protection II under failure
The method of section or III number of segment value is: presetting n group (ULj, Imaxj) two Dimension Numerical Value series or curve, ULFor net side electricity
Pressure, j=1,2 ... n, according to current detection ULjSize obtains limit value Imax using interpolation method or look-up method.
7. a kind of flexible ring net controller as claimed in claim 2 under island state with the fitting method of harmonics,
It is characterized in that: limiting current to instructIt is instructed as inner ring current controller input current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710950146.6A CN109672151A (en) | 2017-10-13 | 2017-10-13 | A kind of flexible ring net controller under island state with the fitting method of harmonics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710950146.6A CN109672151A (en) | 2017-10-13 | 2017-10-13 | A kind of flexible ring net controller under island state with the fitting method of harmonics |
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| CN201710950146.6A Pending CN109672151A (en) | 2017-10-13 | 2017-10-13 | A kind of flexible ring net controller under island state with the fitting method of harmonics |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102219318A (en) * | 2011-04-14 | 2011-10-19 | 中国水利水电科学研究院 | Apparatus and method of independent wind power driven seawater desalination |
| WO2012049294A1 (en) * | 2010-10-14 | 2012-04-19 | Abb Research Ltd | Fault direction parameter indicator device using only current and related methods |
| CN108023337A (en) * | 2016-10-31 | 2018-05-11 | 南京南瑞继保电气有限公司 | A kind of flexible direct current power transmission system transverter operates in failure current limit control and protection fitting method under island state |
-
2017
- 2017-10-13 CN CN201710950146.6A patent/CN109672151A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012049294A1 (en) * | 2010-10-14 | 2012-04-19 | Abb Research Ltd | Fault direction parameter indicator device using only current and related methods |
| CN102219318A (en) * | 2011-04-14 | 2011-10-19 | 中国水利水电科学研究院 | Apparatus and method of independent wind power driven seawater desalination |
| CN108023337A (en) * | 2016-10-31 | 2018-05-11 | 南京南瑞继保电气有限公司 | A kind of flexible direct current power transmission system transverter operates in failure current limit control and protection fitting method under island state |
Non-Patent Citations (1)
| Title |
|---|
| 李斌等: "高压输电线路直流融冰装置故障特性及过流保护", 《电力系统自动化》 * |
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