CN106058842A - DC power grid voltage control method - Google Patents
DC power grid voltage control method Download PDFInfo
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- CN106058842A CN106058842A CN201610591317.6A CN201610591317A CN106058842A CN 106058842 A CN106058842 A CN 106058842A CN 201610591317 A CN201610591317 A CN 201610591317A CN 106058842 A CN106058842 A CN 106058842A
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- Prior art keywords
- voltage
- current conversion
- conversion station
- control
- station
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
Abstract
The present invention provides a DC power grid voltage control method. According to whether the converter station has an ability to regulate voltage or not, the converter station is divided into three categories, namely a voltage control converter station, an auxiliary voltage control converter station, and a power control converter station. The voltage control converter station works in a constant voltage control mode or a current limit control mode; the auxiliary voltage control converter station works in an auxiliary voltage control mode, a constant DC voltage control mode or a power control mode; the power control converter station works in a constant power control mode. Through the adoption of the voltage control method disclosed by the invention, the DC voltage and the power can be controlled accurately in a steady state, and the voltage and the power can be stabilized in a transient state.
Description
Technical field
The invention belongs to direct current network field, particularly to a kind of voltage-controlled method of direct current network.
Background technology
Along with the continuous progress of Power Electronic Technique, flexible direct current power transmission and distribution technology is as the direct current transmission and distribution skill of a new generation
Art can solve currently to exchange the problems that power transmission and distribution technology exists, and along with the expansion of direct current transportation scale, direct current network also becomes
For possible.
In direct current network, the status of DC voltage can analogize to the status of AC network medium frequency, DC voltage
Stably it is directly connected to stablizing of DC power flow, is related to the safe and stable operation of direct current network.Therefore, straight in direct current network
The control of stream voltage is of crucial importance.Multiple current conversion station is often had to have DC voltage control ability in direct current network, according to same
One moment participated in controlling the quantity of the current conversion station of DC voltage and the most common DC voltage control method can be divided into single-point
Voltage control method and multipoint voltage control methods.
The single point voltage control methods single current conversion station of employing is as DC voltage control station, owing to synchronization only one of which is changed
Stream station controls DC voltage, therefore can realize the accurate control of DC voltage, if this current conversion station fault or power are out-of-limit
Thus lose DC voltage control ability, then the current conversion station adapter DC voltage of DC voltage control ability will be had by other
Control.Adapting method is according to whether rely on communication and be divided into zero deflection control methods based on communication and be not based on the deviation control that communicates
Preparation method.Zero deflection control methods depends on communication between quickly standing and realizes the conversion of DC voltage control power, when DC voltage control station
Standby current conversion station is made to realize the adapter of DC voltage control power by communication between quickly station after fault is out of service, but this
Method proposes the highest requirement, if communication time delay is longer, at DC voltage control to speed and the reliability of communication between station
Likely have little time in the case of station failure to realize the adapter of DC voltage control power so that whole straight-flow system is stopped transport.With
Time when direct current network scale is gradually increased, standby current conversion station also will gradually increase, the setting of the priority of DC voltage control
Also will become the most complicated, high-speed communication network also will gradually change complexity, and these defects make zero deflection based on communication control
There is certain difficulty in method popularization and application in direct current network.
DC voltage error method is a kind of control mode without interior communication, i.e. moves back at DC voltage control station failure
Going out after running, the DC voltage control station of standby is able to detect that the relatively large deviation of DC voltage and proceeds to constant DC voltage control
Pattern, it is ensured that stablizing of DC voltage, but multiple standby current conversion station needs multiple priority, adds answering of controller design
Miscellaneous degree, when direct current network scale is gradually increased, standby current conversion station also will increase, owing to the DC voltage of direct current network exists one
Fixed range of operation, therefore deviation can not exceed DC voltage range of operation, which limits the differential and progression that deviation controls,
These defects make the popularization and application in direct current network of the deviation control methods there is certain difficulty.
Multipoint voltage control methods, i.e. synchronization direct current network there is multiple current conversion station control DC voltage, common many
Point voltage control methods is slope voltage control methods.The multiple slope voltage of this method controls the meritorious of current conversion station and exerts oneself with AC line
The impedance on road also has respective slope relevant, and DC voltage and active power all can not accomplish accurately to control.
Summary of the invention
The purpose of the present invention, is to provide a kind of voltage-controlled method of direct current network, can accurately control straight during stable state
Stream voltage, can suppress DC voltage deviation during transient state.
In order to reach above-mentioned purpose, the technical solution used in the present invention is:
Whether a kind of voltage-controlled method of direct current network, have pressure regulation ability by changing in direct current network according to current conversion station
Stream station is divided three classes, i.e. Control of Voltage current conversion station, boost voltage controls current conversion station, power control current conversion station, the Control of Voltage change of current
Station is operated in determines voltage mode control or Current limited Control pattern, and boost voltage controls current conversion station and is operated in boost voltage control mould
Formula or constant DC voltage control pattern or power control mode, power controls current conversion station and is operated in constant dc power control pattern.
The voltage-controlled method of above-mentioned direct current network, described boost voltage controls current conversion station, according to current conversion station rated power
Size, it carries out assist control and has priority difference voltage, and the big priority of rated power is high.
The control method of above-mentioned direct current network voltage, when DC voltage control station is operated in constant DC voltage control pattern
Time, boost voltage control station can be operated in constant dc power control pattern；When DC voltage control station is operated in current-limit mode, auxiliary
Control of Voltage current conversion station is helped to be operated in boost voltage control mode；When the locking of DC voltage control station when, priority is high
Boost voltage controls current conversion station and is operated in constant DC voltage control mode；
The voltage-controlled method of above-mentioned direct current network, the implementation method of described boost voltage control model is:
(1) boost voltage control current conversion station 2 detects DC voltage Udc；
(2) boost voltage control current conversion station 2 calculates DC voltage UdcWith rated direct voltage UdcNDeviation delta U2=| Udc-
UdcN|；Boost voltage controls current conversion station 2 and voltage deviation value Δ U detected2>ΔUe1(ΔUe1Voltage deviation for current conversion station 2 is fixed
Value) time, it is believed that DC voltage control station current conversion station 1 can not stability contorting DC voltage, boost voltage control current conversion station 2 then work
Make in boost voltage control model；
(3) boost voltage control current conversion station 3 calculates DC voltage UdcWith rated direct voltage UdcNDeviation delta U3=| Udc-
UdcN|；Boost voltage controls current conversion station 3 and voltage deviation value Δ U detected3>ΔUe2Time (Δ Ue2Voltage deviation for current conversion station 2 is fixed
Value), it is believed that DC voltage control current conversion station 1 and boost voltage control current conversion station 2 can not stability contorting DC voltage, auxiliary electricity
Voltage-controlled current conversion station processed 3 is then operated in boost voltage control model, wherein Δ Ue2>ΔUe1。
After using such scheme, the invention have the benefit that
(1) DC voltage and power can accurately be controlled during stable state；
(2) can be with stable DC voltage and power during transient state.
Accompanying drawing explanation
Fig. 1 is the typical control model of direct current network inverter, and (a) is constant dc power control pattern, and (b) is boost voltage control
Molding formula, (c) is to determine voltage mode control；
Fig. 2 is the voltage-controlled embodiment of direct current network.
Detailed description of the invention
Below with reference to drawings and the specific embodiments, technical scheme is described in detail.
A kind of voltage-controlled method of direct current network, it is characterised in that whether having pressure regulation ability according to current conversion station will be straight
Current conversion station in stream electrical network is divided three classes, i.e. Control of Voltage current conversion station, boost voltage controls current conversion station, power control current conversion station,
Control of Voltage current conversion station is operated in determines voltage mode control or Current limited Control pattern, and boost voltage controls current conversion station and is operated in auxiliary
Helping voltage mode control or constant DC voltage control pattern or power control mode, power control current conversion station is operated in determines merit
Rate control model.
The voltage-controlled method of above-mentioned direct current network, it is characterised in that described boost voltage controls current conversion station, according to the change of current
Standing the size of rated power, it carries out assist control and has priority difference voltage, and the priority that rated power is big is high.
The control method of above-mentioned direct current network voltage, it is characterised in that determine DC voltage when DC voltage control station is operated in
During control model, boost voltage control station can be operated in constant dc power control pattern；When DC voltage control station is operated in current limliting
During pattern, boost voltage controls current conversion station and is operated in boost voltage control mode；When the locking of DC voltage control station when, excellent
The boost voltage that first level is high controls current conversion station and is operated in constant DC voltage control mode；
The voltage-controlled method of above-mentioned direct current network, it is characterised in that the implementation method of described boost voltage control model
For:
(1) boost voltage control current conversion station 2 detects DC voltage Udc；
(2) boost voltage control current conversion station 2 calculates DC voltage UdcWith rated direct voltage UdcNDeviation delta U2=| Udc-
UdcN|；Boost voltage controls current conversion station 2 and voltage deviation value Δ U detected2>ΔUe1(ΔUe1Voltage deviation for current conversion station 2 is fixed
Value) time, it is believed that DC voltage control station current conversion station 1 can not stability contorting DC voltage, boost voltage control current conversion station 2 then work
Make in boost voltage control model；
(3) boost voltage control current conversion station 3 calculates DC voltage UdcWith rated direct voltage UdcNDeviation delta U3=| Udc-
UdcN|；Boost voltage controls current conversion station 3 and voltage deviation value Δ U detected3>ΔUe2Time (Δ Ue2Voltage deviation for current conversion station 2 is fixed
Value), it is believed that DC voltage control current conversion station 1 and boost voltage control current conversion station 2 can not stability contorting DC voltage, auxiliary electricity
Voltage-controlled current conversion station processed 3 is then operated in boost voltage control model, wherein Δ Ue2>ΔUe1。
Fig. 1 is the typical control model of direct current network inverter, and wherein (a) is constant dc power control pattern, and (b) is auxiliary electricity
Pressure control model, (c) is to determine voltage mode control.
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
The technological thought proposed according to the present invention, any change done on the basis of technical scheme, each fall within scope
Within.
Claims (4)
1. the voltage-controlled method of direct current network, it is characterised in that whether there is pressure regulation ability by direct current according to current conversion station
Current conversion station in electrical network is divided three classes, i.e. Control of Voltage current conversion station, boost voltage controls current conversion station, power control current conversion station, electricity
Voltage-controlled current conversion station processed is operated in determines voltage mode control or Current limited Control pattern, and boost voltage controls current conversion station and is operated in auxiliary
Voltage mode control or constant DC voltage control pattern or power control mode, power controls current conversion station and is operated in and determines power
Control model.
2. a kind of voltage-controlled method of direct current network as claimed in claim 1, it is characterised in that: described boost voltage controls
Current conversion station, according to the size of current conversion station rated power, it carries out assist control and has priority difference voltage, and rated power is big
Priority high.
The control method of a kind of direct current network voltage the most as claimed in claim 1, it is characterised in that: when DC voltage control station
When being operated in constant DC voltage control pattern, boost voltage control station is operated in constant dc power control pattern；Work as DC voltage control
When station is operated in current-limit mode, boost voltage controls current conversion station and is operated in boost voltage control mode；When DC voltage control station
The when of locking, the boost voltage that priority is high controls current conversion station and is operated in constant DC voltage control mode.
4. a kind of voltage-controlled method of direct current network as claimed in claim 1, it is characterised in that: described boost voltage controls
The implementation method of pattern is:
(1) boost voltage control current conversion station 2 detects DC voltage Udc；
(2) boost voltage control current conversion station 2 calculates DC voltage UdcWith rated direct voltage UdcNDeviation delta U2=| Udc-UdcN
|；
Boost voltage controls current conversion station 2 and voltage deviation value Δ U detected2>ΔUe1Time, Δ Ue1Voltage deviation for current conversion station 2 is fixed
Value, it is believed that DC voltage control station current conversion station 1 can not stability contorting DC voltage, boost voltage control current conversion station 2 then work
In boost voltage control model；
(3) boost voltage control current conversion station 3 calculates DC voltage UdcWith rated direct voltage UdcNDeviation delta U3=| Udc-UdcN
|；
Boost voltage controls current conversion station 3 and voltage deviation value Δ U detected3>ΔUe2Time, Δ Ue2Voltage deviation for current conversion station 2 is fixed
Value, it is believed that DC voltage control current conversion station 1 and boost voltage control current conversion station 2 can not stability contorting DC voltage, auxiliary electricity
Voltage-controlled current conversion station processed 3 is then operated in boost voltage control model, wherein Δ Ue2>ΔUe1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610591317.6A CN106058842A (en) | 2016-07-25 | 2016-07-25 | DC power grid voltage control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610591317.6A CN106058842A (en) | 2016-07-25 | 2016-07-25 | DC power grid voltage control method |
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| CN106058842A true CN106058842A (en) | 2016-10-26 |
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| CN201610591317.6A Pending CN106058842A (en) | 2016-07-25 | 2016-07-25 | DC power grid voltage control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106374451A (en) * | 2016-11-18 | 2017-02-01 | 合肥工业大学 | DC residential energy router based on multi-port converter and control method thereof |
| CN106786481A (en) * | 2017-01-23 | 2017-05-31 | 全球能源互联网研究院 | A kind of direct current network multipoint voltage control method |
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| CN104022522A (en) * | 2014-06-09 | 2014-09-03 | 山东大学 | Method for cooperatively controlling multiport flexible DC power transmission system |
| WO2015131602A1 (en) * | 2014-03-04 | 2015-09-11 | 国家电网公司 | Method for coordinating and controlling multi-terminal flexible direct current transmission system |
| CN105552946A (en) * | 2015-12-30 | 2016-05-04 | 国网辽宁省电力有限公司电力科学研究院 | DC voltage control method of flexible ring network controller and control system thereof |
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2016
- 2016-07-25 CN CN201610591317.6A patent/CN106058842A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015131602A1 (en) * | 2014-03-04 | 2015-09-11 | 国家电网公司 | Method for coordinating and controlling multi-terminal flexible direct current transmission system |
| CN104022522A (en) * | 2014-06-09 | 2014-09-03 | 山东大学 | Method for cooperatively controlling multiport flexible DC power transmission system |
| CN105552946A (en) * | 2015-12-30 | 2016-05-04 | 国网辽宁省电力有限公司电力科学研究院 | DC voltage control method of flexible ring network controller and control system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374451A (en) * | 2016-11-18 | 2017-02-01 | 合肥工业大学 | DC residential energy router based on multi-port converter and control method thereof |
| CN106786481A (en) * | 2017-01-23 | 2017-05-31 | 全球能源互联网研究院 | A kind of direct current network multipoint voltage control method |
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Application publication date: 20161026 |