CN106936141A - The active power controller method and its control system of a kind of flexible ring net controller - Google Patents
The active power controller method and its control system of a kind of flexible ring net controller Download PDFInfo
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- CN106936141A CN106936141A CN201511023217.5A CN201511023217A CN106936141A CN 106936141 A CN106936141 A CN 106936141A CN 201511023217 A CN201511023217 A CN 201511023217A CN 106936141 A CN106936141 A CN 106936141A
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- voltage
- active power
- conversion station
- current conversion
- controller
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Rectifiers (AREA)
Abstract
The present invention relates to the active power controller method and its control system of a kind of flexible ring net controller, including：Determine active power side current conversion station into watt current reference valueDetermine the watt current reference value of active power side current conversion stationOffside current conversion station is transferred to by communication optical fiber, that is, determines DC voltage side current conversion station；Determine the reference signal U that DC voltage side current conversion station generates DC voltagedcref；Communicated using between station, the DC voltage controller for determining DC voltage side current conversion station receives watt current reference valueThrough introducing additional signalThe generation of outer shroud DC voltage controller determine the positive sequence d shaft current reference values of DC voltage side current conversion stationThe technical scheme that the present invention is provided is communicated using between station, the watt current reference value for determining the generation of active power current conversion station is introduced in the DC voltage controller for determining DC voltage side current conversion station as additional signal, controlled by the coordination of two ends current conversion station, realize the quick regulation to flexible ring net controller transmitting active power.
Description
Technical field
The present invention relates to the control strategy of flexible ring net controller, and in particular to a kind of active power controller of flexible ring net controller
Method and its control system.
Background technology
Flexible ring net controller is back-to-back flexible direct current, and its Control system architecture is symmetrical, mainly by inner ring current controller, outer
Several part compositions such as ring power controller, Phase-Locked Synchronous link and trigger pulse generation link.Wherein, conventional outer shroud control
Device form has：Constant DC voltage control, determine active power controller, determine Reactive Power Control, determine alternating voltage control etc..Outer shroud
The given reference signal of controller tracking system level controller.In order to keep the active power balance of system, system must have side
Current conversion station uses constant DC voltage control, and opposite side current conversion station is used and determines active power controller.
When needing to be lifted in the flexible ring net controller short time or time drop connects the active power that two ends AC system is transmitted,
Determine higher level's active power command value Pset that power side current conversion station received to change, original control strategy relies solely on surely active
The current conversion station of power side completes regulation：There is a fixed response time, the change of another aspect active power in the response change of one side active power
DC voltage can be made to produce larger fluctuation, therefore when flexible ring net controller needs to provide active power support, this kind of control rings
The drawbacks of answering time delay to have certain.
The content of the invention
To solve above-mentioned deficiency of the prior art, it is an object of the invention to provide a kind of active power control of flexible ring net controller
Method processed and its control system, the method for the present invention are that a kind of flexible ring net controller active power based on communication between station is quickly assisted
The method for regulating and controlling system.
The purpose of the present invention is realized using following technical proposals：
The present invention provides a kind of active power controller method of flexible ring net controller, and it is theed improvement is that, methods described includes
Following step：
(1) active power side current conversion station generation watt current reference value is determined；
(2) active power reference value of active power side current conversion station is determinedOffside current conversion station is transferred to by communication optical fiber, i.e., it is fixed
DC voltage side current conversion station；
(3) the reference signal U that DC voltage side current conversion station generates DC voltage is determineddcref；
(4) the DC voltage control module for determining DC voltage side current conversion station is receivedSignal；
(5) DC voltage side current conversion station generation positive sequence d shaft current reference values are determined
Further, in the step (1), the active power controller module reception higher level for determining active power controller side current conversion station has
Work(power command value Pset, active power command value PsetWith for power oscillation damping and realize the purposes such as emergency DC power support modulate
Marker signal PmBy active power regulation link, according to AC system running status, generation active power reference value Pref_opp,
Different active instruction governing loop and upper lower limit values are designed as needed；Outer shroud Active Power Controller is according to active power reference
Value Pref_oppGeneration active power current reference value；
Under three-phase power grid voltage equilibrium condition, the direction of power taking net voltage vector Us is d direction of principal axis, designs outer shroud active power
Controller, generates watt current reference value；
Wherein：Us、isd, P alternating voltages, watt current and active power.
Further, in the step (3), the DC voltage control module for determining DC voltage side current conversion station receives higher level's direct current
Pressure dispatch command Udcset, the reference signal U of DC voltage is generated by DC voltage regulation linkdcref；Design as needed different
DC voltage regulation link and upper lower limit value.
Further, in the step (4), active power side is determined in the DC voltage controller reception for determining DC voltage side current conversion station
The watt current reference value of current conversion station, as additional control signals.
Further, in the step (5), the reference signal Udcref of DC voltage is by after outer shroud DC voltage controller
The signal and additional control signals of generationIt is added, then by amplitude limit link and transform part, generation is determined DC voltage side and is changed
Flow the positive sequence d shaft current reference values at station
Further, using constant DC voltage control pattern transverter be used for balance straight-flow system it is active and keep DC voltage
Stabilization；When R is ignored and transverter is lost, the active holding balance of the transverter alternating current-direct current both sides of constant DC voltage control pattern,
I.e.：
During stable state：
When VSC alternating current-direct currents both sides it is active uneven when, the fluctuation of DC voltage will be caused, now watt current then will be to direct current
Lateral capacitance charge or discharge, until DC voltage stability is in setting value；For the transverter of constant DC voltage control, quite
In an active balance node；In designed constant DC voltage control device, DC voltage and DC voltage instruct deviation through PI
As the reference value of watt current after regulation
Wherein：Us、isd、Pdc、udc、idcDifference alternating voltage, watt current, dc power, DC voltage and direct current
Stream.
The present invention provides a kind of control system of the active power controller method of flexible ring net controller, and it is theed improvement is that, institute
Determining of stating that control system includes being communicated successively and determines DC voltage side current conversion station at active power side current conversion station；
It is described to determine active power controller side current conversion station and include the active power controller module that is communicated successively and outer shroud active power control
Device module processed；Active power controller module is used to receive higher level's active power command value Pset, active power reference value generation module use
In generation active power reference value Pref；Outer shroud Active Power Controller module is according to active power reference value PrefGeneration watt current
Reference value；
It is described to determine DC voltage side current conversion station including DC voltage control module；The DC voltage control module is used to receive higher level
DC voltage dispatch command Udcset；And generate the reference signal U of DC voltagedcref。
Compared with immediate prior art, the excellent effect that the technical scheme that the present invention is provided has is：
Introduce fixed using in the DC voltage controller for determining DC voltage side current conversion station based on communication between station the invention provides a kind of
The intermediate control signal of active power side current conversion station realizes the coordination control to transmitting active power quick regulation as additional signal
Method, with following remarkable result：
1. the method using station between will determine active power side current conversion station according to active power command value generation constant DC voltage control
The additional signal of the DC voltage controller of side current conversion station, simulation result shows that the method can be by flexible ring net controller active power
Regulating time reduction about 30ms, hence it is evident that improve control response speed.
2. that the task of regulation and control active power is undertaken institute by single current conversion station is different for the method and general control strategy, and it is by wattful power
Rate regulates and controls task by two current conversion station shareds, improves the flexibility of control, enhances the ability of system stable operation, carries
High economy and security.
3. the method introduces the signal that offside active power command value is generated in DC voltage controller, makes DC voltage
Control is also more stablized, and can effectively stabilize the fluctuation of DC voltage in active power change procedure, by DC voltage fluctuation by ± 6%~
± 7% control is arrived within ± 1%.
Brief description of the drawings
Fig. 1 is the flow chart of the active power controller method of the flexible ring net controller that the present invention is provided；
Fig. 2 be the present invention provide active power side additional signal determined based on communication between station be incorporated into determine DC voltage side controller and patrol
Collect figure；
Fig. 3 is the simulation result figure of the active power controller that the present invention is provided, wherein：A () higher level active power command value is emulated
As a result；(b) DC current simulation result；(c) DC voltage simulation result；
Fig. 4 is the logic chart of the generation active power reference value that the present invention is provided；
Fig. 5 is the logic chart of the reference signal of the generation DC voltage that the present invention is provided；
Fig. 6 is the logic chart of the outer shroud DC voltage controller that the present invention is provided；
Fig. 7 is the logic chart of the outer shroud Active Power Controller that the present invention is provided.
Specific embodiment
Specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to put into practice it
.Other embodiments can include structure, logic, it is electric, process and it is other changes.Embodiment only generation
The possible change of table.Unless explicitly requested, otherwise single component and function are optional, and the order for operating can change.
The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.Implementation of the invention
The gamut of the scope of scheme including claims, and claims all obtainable equivalent.Herein,
These embodiments of the invention can individually or generally be represented that it is convenient that this is used for the purpose of with term " invention ", and
And if in fact disclosing the invention more than, the scope for being not meant to automatically limit the application is any single invention or hair
Bright design.
Flexible ring net controller be two voltage source converters in back-to-back form, be attached in AC network transmission line of electricity, pass through
Independent control active to AC system, idle, realizes the functions such as electromagnetic looped network off-the-line, Fault Isolation, reactive power support.
In order to improve regulation and control speed of the flexible ring net controller to active power, the invention provides a kind of fast based on what is communicated between station
Fast active power controller method, its flow chart is as shown in figure 1, specifically include following steps：
Step (1)：The active power controller module for determining active power controller side current conversion station receives higher level's active power command value Pset,
Active power command value PsetWith for power oscillation damping and realize the purposes such as emergency DC power support modulation marker signal PmBy having
Work(power adjusting link, according to AC system running status, generation active power reference value Pref, design different has as needed
Work(instructs governing loop and upper lower limit value.Based between station communication determine active power side additional signal be incorporated into determine DC voltage side control
Device logic chart is as shown in Figure 2.Outer shroud Active Power Controller is according to active power reference value PrefGeneration watt current reference value.The logic chart of outer shroud Active Power Controller is as shown in Figure 7.Under three-phase power grid voltage equilibrium condition, line voltage is taken
Vector UsDirection be d direction of principal axis, design outer shroud Active Power Controller, generate watt current reference value；Generation has
The logic chart of work(value and power reference is as shown in Figure 4：
Wherein：Us、isd, P alternating voltages, watt current and active power.Simulation result figure such as Fig. 3 of active power controller
It is shown, wherein：(a) higher level active power command value simulation result；(b) DC current simulation result；C () DC voltage is imitated
True result；
Step (2)：Active power side current conversion station is determined by the active power reference value in step (1)Transmitted by communication optical fiber
To offside current conversion station, that is, determine DC voltage side current conversion station.
Step (3)：The DC voltage control module for determining DC voltage side current conversion station receives DC voltage dispatch command Udcset, pass through
DC voltage regulation link generates the reference signal U of DC voltagedcref.Generate logic chart such as Fig. 5 of the reference signal of DC voltage
It is shown.
Step (4)：In determining the DC voltage controller receiving step (2) of DC voltage side current conversion station, as additional
Control signal.The logic chart of outer shroud DC voltage controller is as shown in Figure 6.
Step (5)：U in step (3)dcrefBy the control signal and step (4) that are produced after Active Power Controller PI links
In additional control signalsIt is added, then by amplitude limit link and transform part, the positive sequence d axles of DC voltage side are determined in generation
Current reference value
Using constant DC voltage control pattern transverter be used for balance straight-flow system it is active and keep DC-side Voltage Stabilization；Neglecting
When slightly R and transverter are lost, the active holding balance of transverter alternating current-direct current both sides, i.e.,：
During stable state：
When VSC alternating current-direct currents both sides it is active uneven when, the fluctuation of DC voltage will be caused, now watt current then will be to direct current
Lateral capacitance charge or discharge, until DC voltage stability is in setting value；For the transverter of constant DC voltage control, quite
In an active balance node；In designed constant DC voltage control device, DC voltage and DC voltage instruct deviation through PI
After regulation, with additional control signalsAfter addition, as the reference value of watt current
The present invention also provides a kind of control system of the active power controller method of flexible ring net controller, and control system is included successively
Determining of being communicated and determines DC voltage side current conversion station at active power side current conversion station；
Determining active power controller side current conversion station includes the active power controller module and outer shroud Active Power Controller that are communicated successively
Module；Active power controller module is used to receive higher level's active power command value Pset, generation module is for generating active power reference
Value Pref；Outer shroud Active Power Controller module is according to active power reference value PrefGeneration watt current reference value。
Determining DC voltage side current conversion station includes the DC voltage control module that communicates successively (DC voltage regulation link is (i.e. described
Generate DC voltage referrer module) be DC voltage control module a part)；The DC voltage control module is used
In reception higher level's DC voltage dispatch command Udcset；And generate the reference signal U of DC voltagedcref；
The present invention is used to be introduced in the DC voltage controller for determining DC voltage side current conversion station and determines active power side based on communication between station
The watt current reference value that current conversion station is produced and then realizes the quick of transmitting active power as the control method for coordinating of additional signal
Regulation, the regulating time needed for simulation result shows can reduce at least about 30ms.On the other hand, changed in transimission power
During, under former control strategy DC voltage produce fluctuation ± 6%~± 7% or so, the ripple of DC voltage under new control strategy
Move not over ± 1%.The present invention improves the ability of flexible ring net controller system stable operation, reduces the requirement to equipment,
Improve Technical Economy and security.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations, although with reference to above-described embodiment to the present invention
Be described in detail, those of ordinary skill in the art specific embodiment of the invention can still be modified or
Person's equivalent, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent
Within bright claims.
Claims (7)
1. a kind of active power controller method of flexible ring net controller, it is characterised in that methods described comprises the steps：
(1) active power side current conversion station generation watt current reference value is determined
(2) active power reference value of active power side current conversion station is determinedOffside current conversion station, offside are transferred to by communication optical fiber
Current conversion station is to determine DC voltage side current conversion station；
(3) the reference signal U that DC voltage side current conversion station generates DC voltage is determineddcref；
(4) the DC voltage control module for determining DC voltage side current conversion station is receivedSignal；
(5) DC voltage side current conversion station generation positive sequence d shaft current reference values are determined
2. active power controller method as claimed in claim 1, it is characterised in that in the step (1), determine wattful power
The active power controller module of rate control side current conversion station receives higher level's active power command value Pset, active power command value PsetWith with
In power oscillation damping and realize the purposes such as emergency DC power support modulation marker signal PmBy active power regulation link, according to friendship
Streaming system running status, generation active power reference value Pref_opp, design as needed different active instruction governing loop and on
Lower limit；Outer shroud Active Power Controller is according to active power reference value Pref_oppGeneration active power current reference value
Under three-phase power grid voltage equilibrium condition, the direction of power taking net voltage vector Us is d direction of principal axis, designs outer shroud active power
Controller, generates watt current reference value
Wherein：Us、isd, P alternating voltages, watt current and active power.
3. active power controller method as claimed in claim 1, it is characterised in that in the step (3), determine direct current
The DC voltage control module of side current conversion station is pressed to receive higher level's DC voltage dispatch command Udcset, given birth to by DC voltage regulation link
Into the reference signal U of DC voltagedcref；Different DC voltage regulation link and upper lower limit values are designed as needed.
4. active power controller method as claimed in claim 1, it is characterised in that in the step (4), determine direct current
The DC voltage controller of side current conversion station is pressed to receive the watt current reference value for determining active power side current conversion stationAs additional
Control signal.
5. active power controller method as claimed in claim 1, it is characterised in that in the step (5), DC voltage
Reference signal Udcref by after outer shroud DC voltage controller produce signal and additional control signalsIt is added, then passes through
Amplitude limit link and transform part are crossed, the positive sequence d shaft current reference values of DC voltage side current conversion station are determined in generation
6. active power controller method as claimed in claim 5, it is characterised in that using changing for constant DC voltage control pattern
Stream device be used for balance straight-flow system it is active and keep DC-side Voltage Stabilization；When R is ignored and transverter is lost, DC voltage is determined
The active holding balance of the transverter alternating current-direct current both sides of control model, i.e.,：
During stable state：
When VSC alternating current-direct currents both sides it is active uneven when, the fluctuation of DC voltage will be caused, now watt current then will be to direct current
Lateral capacitance charge or discharge, until DC voltage stability is in setting value；For the transverter of constant DC voltage control, quite
In an active balance node；In designed constant DC voltage control device, DC voltage and DC voltage instruct deviation through PI
As the reference value of watt current after regulation
Wherein：Us、isd、Pdc、udc、idcDifference alternating voltage, watt current, dc power, DC voltage and direct current
Stream, iLDC current during for stable state.
7. the control system of a kind of active power controller method of flexible ring net controller as described in claim any one of 1-6,
Characterized in that, the control system determining of including being communicated successively and determines DC voltage side current conversion station at active power side current conversion station；
It is described to determine active power controller side current conversion station and include the active power controller module that is communicated successively and outer shroud active power control
Device module processed；Active power controller module is used to receive higher level's active power command value Pset, active power reference value generation module use
In generation active power reference value Pref；Outer shroud Active Power Controller module is according to active power reference value PrefGeneration watt current
Reference value
It is described to determine DC voltage side current conversion station including DC voltage control module；The DC voltage control module is used to receive higher level
DC voltage dispatch command Udcset；And generate the reference signal U of DC voltagedcref。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511023217.5A CN106936141B (en) | 2015-12-30 | 2015-12-30 | Active power control method and control system of flexible ring network controller |
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|---|---|---|---|
| CN201511023217.5A CN106936141B (en) | 2015-12-30 | 2015-12-30 | Active power control method and control system of flexible ring network controller |
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| CN106936141A true CN106936141A (en) | 2017-07-07 |
| CN106936141B CN106936141B (en) | 2020-10-13 |
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Cited By (2)
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| CN109120016A (en) * | 2018-10-26 | 2019-01-01 | 贵州电网有限责任公司 | A kind of dc power modulated in real time method of the load balancing control based on DDC |
| WO2021022949A1 (en) * | 2019-08-02 | 2021-02-11 | 全球能源互联网研究院有限公司 | Looped network controller and control method |
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| WO2021022949A1 (en) * | 2019-08-02 | 2021-02-11 | 全球能源互联网研究院有限公司 | Looped network controller and control method |
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| Publication number | Publication date |
|---|---|
| CN106936141B (en) | 2020-10-13 |
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