CN109494780A - A kind of DC transmission system power turns for method and system - Google Patents
A kind of DC transmission system power turns for method and system Download PDFInfo
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- CN109494780A CN109494780A CN201811376496.7A CN201811376496A CN109494780A CN 109494780 A CN109494780 A CN 109494780A CN 201811376496 A CN201811376496 A CN 201811376496A CN 109494780 A CN109494780 A CN 109494780A
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- 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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Abstract
A kind of DC transmission system power turns for method and system, when there are when converter station valve group operating condition out of service for the Hybrid HVDC system under asymmetric topology operating condition: calculating the power of each valve group before converter station valve group exits based on current commutation station total power value；Preceding each valve group power is exited based on valve group and exits the value and power reference that valve group quantity resets the converter station, the flexibility of system operation is improved, reduces system power loss to greatest extent to the greatest extent, reduces, machine, cutting load are cut in mains frequency variation, reduction.
Description
Technical field
The present invention relates to high-voltage dc transmission electrical domains, and in particular to a kind of DC transmission system power turns Dai Fangfa and is
System.
Background technique
High voltage dc transmission technology (VSC-HVDC) based on voltage source converter has extensively in direct current transportation field
General application.Compared with the high voltage dc transmission technology (LCC-HVDC) based on line commutation inverter, VSC-HVDC has knot
Structure is compact, active and reactive power is separately adjustable, without commutation failure risk, black start-up ability, the passive or weak AC system of access
The advantages that.High voltage dc transmission technology (MMC-HVDC) based on modularization multi-level converter is the one kind for realizing VSC-HVDC
Important way.
With the continuous maturation of MMC-HVDC technology, MMC-HVDC has marched toward (± 800kV) extra-high voltage grade, this makes
The interconnection for obtaining LCC-HVDC and MMC-HVDC is possibly realized.LCC-HVDC by the different modes of connection and is opened up from MMC-HVDC
It flutters and is combined, form Hybrid HVDC system, it can be in conjunction with the advantages of the two, in remote, bulk power transmission occasion
It has a good application prospect.
In DC transmission system, the reliability and flexibility of system can be improved using bipolar wiring.Dipolar configuration
Feature is: positive and negative anodes possess independent converter, transmission line of electricity and control system, and positive and negative anodes can be used as two independent systems
System operation.To reduce the electrical stress of primary equipment, improving system availability, reduction converter power transformer manufacture difficulty, in positive and negative anodes
LCC and MMC should all be using high-end valve group and the concatenated mode of connection of low side valve group, and be equipped with high speed by-pass switch, bypass every
Leave pass etc..
In DC transmission system, inverter will appear some valve group in longtime running and break down or exit because of maintenance
The case where operation, at this moment pole power will cause loss where the valve group.
Summary of the invention
In order to solve the problems of in the prior art, the present invention provides a kind of DC transmission system power and turns Dai Fangfa
And system.
Present invention provide the technical scheme that
A kind of DC transmission system power turns Dai Fangfa, which comprises
When the operating condition that the Hybrid HVDC system under asymmetric topology operating condition is out of service there are converter station valve group
When:
The power of each valve group before converter station valve group exits is calculated based on current commutation station total power value；
Preceding each valve group power is exited based on valve group and exits the power reference that valve group quantity resets the converter station
Value.
Preferably, it is described exited based on valve group before each valve group power and exit valve group quantity and reset the converter station
Value and power reference, comprising:
The operating condition of each pole of the converter station is determined according to the quantity for exiting valve group；
Each valve group power before being exited according to the quantity and valve group that exit valve group, determines the power reference of each pole of the converter station
Value；
The value and power reference of the converter station is determined based on the value and power reference of each pole of the converter station；
Wherein, each valve group power of the converter station is equal.
Preferably, the quantity that the basis exits valve group determines the operating condition of each pole of the converter station, comprising:
When there is one group of valve group to exit, total pressure operation in pole where the valve group that exits switchs to the operation of half pressure, it is another extremely
Total pressure operation；
When there is two groups of valve groups to exit, if pole stops fortune where the valve group that the valve group exited in same pole, exits
Row, another extremely total pressure operation；Otherwise, the two poles of the earth of the converter station switch to the operation of half pressure by total pressure operation simultaneously；
When there is three groups of valve groups to exit, the place that two groups of valve groups all exit is extremely out of service, and another pole is turned by total pressure operation
For half pressure operation.
Preferably, the basis exits the quantity of valve group and valve group exits preceding each valve group power, determines that the converter station is each
The value and power reference of pole, comprising:
When thering is one group of valve group to exit:
WhenWhen, the value and power reference of pole is set as 2P where half pressure operation0, the function of pole where total pressure operation
Rate reference value is constant；
WhenWhen, the value and power reference of pole is set as P where half pressure operationrated, pole where total pressure operation
Value and power reference is set as 4P0-Prated；
WhenWhen, the performance number of pole is set as P where half pressure operationrated, pole where total pressure operation
Performance number reference value is set as 2Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power, P0≤Prated。
Preferably, the basis exits the quantity of valve group and valve group exits preceding each valve group power, determines that the converter station is each
The value and power reference of pole, comprising:
When thering are two groups of valve groups to exit:
If the valve group exited in same pole, whenWhen, pole value and power reference where total pressure operation is set as 4P0；
WhenWhen, pole value and power reference where total pressure operation is set as 2Prated；
If the valve group exited not in same pole, whenWhen, the two poles of the earth value and power reference is disposed as 2P0；
WhenWhen, the two poles of the earth value and power reference is disposed as 2Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power, P0≤Prated。
Preferably, the basis exits the quantity of valve group and valve group exits preceding each valve group power, determines that the converter station is each
The value and power reference of pole, comprising:
When thering are three groups of valve groups to exit:
WhenWhen, pole value and power reference where half pressure operation is set as 4P0；
WhenWhen, pole value and power reference where half pressure operation is set as Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power, P0≤Prated。
Preferably, the power that each valve group of converter station is calculated based on current commutation station total power value, calculating formula is such as
Under:
In formula, P0Each valve group power before being exited for converter station valve group；PAlwaysFor converter station general power.
A kind of DC transmission system power turns for system, the system comprises:
Computing module: for there are converter station valve groups to move back when the Hybrid HVDC system under asymmetric topology operating condition
When the operating condition run out；
The performance number of each valve group before converter station valve group exits is calculated based on current commutation station performance number；
Setup module: the change of current is reset for exiting preceding each valve group power based on valve group and exiting valve group quantity
The value and power reference stood.
Preferably, set module, comprising: first determines that submodule, second determine that submodule and third determine submodule；
Described first determines submodule, for determining the operation feelings of each pole of the converter station according to the quantity for exiting valve group
Condition；
Described second determines submodule, exits the quantity of valve group for basis and valve group exits preceding each valve group power, determine
The value and power reference of each pole of converter station；
The third determines submodule, for determining the converter station based on the value and power reference of each pole of the converter station
Value and power reference；
Wherein, each valve group power of the converter station is equal.
Preferably, described second submodule is determined, comprising: first exits unit, second exits unit and third exits list
Member；
Described first exits unit, total pressure operation in pole where the valve group for exiting when there is one group of valve group to exit
Switch to the operation of half pressure, another extremely total pressure operation；
Described second exits unit, for when there is two groups of valve groups to exit, if the valve group exited is exited in same pole
It is extremely out of service where the valve group, another extremely total pressure operation；Otherwise, the two poles of the earth of the converter station are turned by total pressure operation simultaneously
For half pressure operation；
The third exits unit, stops fortune for the place pole that when there is three groups of valve groups to exit, two groups of valve groups are all exited
Row, another pole switch to half pressure by total pressure operation and run.
Compared with prior art, the invention has the benefit that
A kind of DC transmission system power turns for method and system, when the mixed DC under asymmetric topology operating condition is defeated
There are when converter station valve group operating condition out of service for electric system: calculating converter station valve group based on current commutation station total power value and exits
The power of preceding each valve group；Preceding each valve group power is exited based on valve group and exits the function that valve group quantity resets the converter station
Rate reference value improves the flexibility of system operation, reduces system power loss to greatest extent to the greatest extent, reduces, power grid frequency
Machine, cutting load are cut in rate variation, reduction.
Detailed description of the invention
Fig. 1 is that DC transmission system power of the invention turns for method flow diagram；
Fig. 2 is DC transmission system dipolar configuration schematic diagram of the invention；
Fig. 3 is that DC transmission system total pressure dress of the invention partly presses postrun structural schematic diagram.
Specific embodiment
For a better understanding of the present invention, the contents of the present invention are done further with example with reference to the accompanying drawings of the specification
Explanation.
Change to reduce sending end and receiving end grid power vacancy and mains frequency, machine, cutting load are cut in reduction, and the present invention proposes
A kind of power after valve group part is out of service in Hybrid HVDC system turns generation strategy, can exit fortune in valve group part
After row, in the case where equipment through-current capability allows, the function for valve group out of service is turned by half pressure operation pole and total pressure operation pole
Rate, so that system power loss be effectively reduced.
Power proposed by the invention turns generation strategy substantially, is to open up at bipolar Hybrid HVDC system asymmetric
In the case where flutterring, positive and negative electrode systems are independently controlled, to reduce system power loss to the maximum extent, system is being received
After certain converter station inner part valve group needs order out of service, the valve group may be implemented with grid switching operation by a series of controls
Half pressure operation of place pole, after system reaches stable state, it is contemplated that converter station generally has certain power margin, should mention immediately
The value and power reference for being in half pressure operation pole and another total pressure operation pole is risen, is turned for some or all of valve group out of service function
Rate, as shown in Figure 1, the specific steps are as follows:
Step 1: when there are converter station valve group is out of service for the Hybrid HVDC system under asymmetric topology operating condition
Operating condition when:
The power of each valve group before converter station valve group exits is calculated based on current commutation station total power value；
Step 2: exiting preceding each valve group power based on valve group and exits the function that valve group quantity resets the converter station
Rate reference value.
Embodiment 1:
Step 1: when there are converter station valve group is out of service for the Hybrid HVDC system under asymmetric topology operating condition
Operating condition when:
The power of each valve group before converter station valve group exits is calculated based on current commutation station total power value；
As shown in Fig. 2, the direct current system uses dipolar configuration, wherein the converter station of sending end is LCC, and the converter station of receiving end is
MMC.Each pole of sending end converter station is composed in series by two 12 pulsation LCC, is connected directly with DC line 111-1
LCC101 is high-end valve group, and the LCC102 close to earthing pole 107 is low side valve group；Each 12 pulsation LCC is by two six arteries and veins
Dynamic LCC is composed in series, each six pulsation LCC is coupled by AC transformer with AC network.Each pole of receiving end converter station
It is composed in series by two MMC, is high-end valve group with the MMC103 that DC line 111-1 is connected directly, close to earthing pole 108
MMC104 is low side valve group；Each MMC is coupled by AC transformer with AC network.
As shown in figure 3, that is, anode only has low side valve group LCC102, MMC104 and electricity so that high-end valve group is out of service as an example
Road 111-1 puts into operation, LCC105, and MMC106 and route 111-2 are that total pressure runs pole.Obtain converter station performance number.
Assuming that the power of each valve group of converter station is identical and is P before positive total pressure turns half pressure operation0, then each pole
Power is 2P0, converter station general power is 4P0.If the rated power of each valve group is Prated, then should have P0≤Prated。
Described calculated based on the converter station performance number is turned for performance number, and calculating formula is as follows:
P=nP0
In formula, P is to turn for power；N is the valve group number exited, n=1,2,3；P0Each valve group before being exited for converter station valve group
Power.
The converter station valve group exits preceding each valve group power, and calculating formula is as follows:
In formula, P0Power before being exited for valve group；PAlwaysFor converter station general power；PPoleFor positive or negative pole power；P0≤
Prated, PratedFor valve group rated power.
Step 2: exiting preceding each valve group power based on valve group and exits the function that valve group quantity resets the converter station
Rate reference value.
The operating condition of each pole of the converter station is determined according to the quantity for exiting valve group；
Each valve group power before being exited according to the quantity and valve group that exit valve group, determines the power reference of each pole of the converter station
Value；
The value and power reference of the converter station is determined based on the value and power reference of each pole of the converter station；
Wherein, each valve group power of the converter station is equal.
Each valve group power before being exited according to the quantity and valve group that exit valve group, determines the operating condition of each pole of the converter station
With value and power reference, comprising:
When there is one group of valve group to exit, total pressure operation in pole where the valve group that exits switchs to the operation of half pressure, it is another extremely
Total pressure operation；
When there is two groups of valve groups to exit, if pole stops fortune where the valve group that the valve group exited in same pole, exits
Row, another extremely total pressure operation；Otherwise, the two poles of the earth of the converter station switch to the operation of half pressure by total pressure operation simultaneously；
When there is three groups of valve groups to exit, the place that two groups of valve groups all exit is extremely out of service, and another pole is turned by total pressure operation
For half pressure operation.
When there is one group of valve group to exit, the value and power reference of each pole of the converter station is determined, comprising:
WhenWhen, the value and power reference of pole is set as 2P where half pressure operation0, the function of pole where total pressure operation
Rate reference value is constant；
WhenWhen, the value and power reference of pole is set as P where half pressure operationrated, pole where total pressure operation
Value and power reference is set as 4P0-Prated；
WhenWhen, the performance number of pole is set as P where half pressure operationrated, pole where total pressure operation
Performance number reference value is set as 2Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power.
When there are two groups of valve groups to exit, the value and power reference of each pole of the converter station is determined, comprising:
If the valve group exited in same pole, whenWhen, pole value and power reference where total pressure operation is set as 4P0；
WhenWhen, pole value and power reference where total pressure operation is set as 2Prated；
If the valve group exited not in same pole, whenWhen, the two poles of the earth value and power reference is disposed as 2P0；
WhenWhen, the two poles of the earth value and power reference is disposed as 2Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power.
When there are three groups of valve groups to exit, the value and power reference of each pole of the converter station is determined, comprising:
WhenWhen, pole value and power reference where half pressure operation is set as 4P0；
WhenWhen, pole value and power reference where half pressure operation is set as Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power, P0≤Prated。
By taking high-end valve group is out of service as an example, i.e., anode only has low side valve group LCC102, MMC104 and circuit 111-1 investment
Operation, LCC105, MMC106 and route 111-2 are that total pressure runs pole, and it is as follows that specific power turns generation strategy:
1) if the power before half pressure operation meets P0≤1/2Prated, then by the power of the half pressure operation valve group LCC102
Reference value is set as 2P0, the total pressure operation pole LCC105 power is constant, and the converter station wasted power is zero at this time.
2) if the power before half pressure operation meets P0>1/2Prated, then the power of the half pressure operation valve group LCC102 is joined
It examines value and is set as Prated, turn the power in generation via LCC102 at this time as (Prated-P0), dump power P0-(Prated-P0)=
(2P0-Prated), the operation of the total pressure as described in converter station pole LCC105 is turned generation by this some residual power.
3) the total pressure operation pole LCC105 original operation power is also 2P0If required turn meets (2P for power0-Prated)+
2P0≤2Prated, i.e. P0≤3/4Prated, then (4P is set by the value and power reference of total pressure operation pole LCC1050-
Prated), the converter station wasted power is zero at this time.
4) if the power before half pressure operation meets 3/4Prated<P0≤Prated, then by the half pressure operation valve group LCC102's
Value and power reference is set as Prated, the value and power reference of total pressure operation pole LCC105 is set as 2Prated, the change of current at this time
Wasted power of standing is (4P0-3Prated)。
The power turns to be summarized as shown in table 1 for strategy.
Table 1
Be calculated turn for value and power reference after, the power of converter station each in system is adjusted, thus complete
Success rate turns for process.
Embodiment 2:
Based on same inventive concept, the present invention also provides a kind of DC transmission system power to turn for system, the system
System includes:
Computing module: for there are converter station valve groups to move back when the Hybrid HVDC system under asymmetric topology operating condition
When the operating condition run out；
The performance number of each valve group of converter station is calculated based on current commutation station total power value, and is calculated and turned for performance number；
Setup module: for the value and power reference of the converter station to be arranged for performance number based on described turn.
Set module, comprising: first determines that submodule, second determine that submodule and third determine submodule；
Described first determines submodule, for determining the operation feelings of each pole of the converter station according to the quantity for exiting valve group
Condition；
Described second determines submodule, exits the quantity of valve group for basis and valve group exits preceding each valve group power and determines institute
State the value and power reference of each pole of converter station；
The third determines submodule, for determining the converter station based on the value and power reference of each pole of the converter station
Value and power reference；
Wherein, each valve group power of the converter station is equal.
Described second determines submodule, comprising: first exits unit, second exits unit and third exits unit；
Described first exits unit, total pressure operation in pole where the valve group for exiting when there is one group of valve group to exit
Switch to the operation of half pressure, another extremely total pressure operation；
Described second exits unit, for when there is two groups of valve groups to exit, if the valve group exited is exited in same pole
It is extremely out of service where the valve group, another extremely total pressure operation；Otherwise, the two poles of the earth of the converter station are turned by total pressure operation simultaneously
For half pressure operation；
The third exits unit, stops fortune for the place pole that when there is three groups of valve groups to exit, two groups of valve groups are all exited
Row, another pole switch to half pressure by total pressure operation and run.
First exits unit, comprising: and it is described when there is one group of valve group to exit, determine the power reference of each pole of the converter station
Value, comprising:
WhenWhen, the value and power reference of pole is set as 2P where half pressure operation0, the function of pole where total pressure operation
Rate reference value is constant；
WhenWhen, the value and power reference of pole is set as P where half pressure operationrated, the function of pole where total pressure operation
Rate reference value is set as 4P0-Prated；
WhenWhen, the performance number of pole is set as P where half pressure operationrated, pole where total pressure operation
Performance number reference value is set as 2Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power.
Second exits unit, comprising: and it is described when there is two groups of valve groups to exit, determine the power reference of each pole of the converter station
Value, comprising:
If the valve group exited in same pole, whenWhen, pole value and power reference where total pressure operation is set as 4P0；
WhenWhen, pole value and power reference where total pressure operation is set as 2Prated；
If the valve group exited not in same pole, whenWhen, the two poles of the earth value and power reference is disposed as 2P0；
WhenWhen, the two poles of the earth value and power reference is disposed as 2Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power.
Third exits unit, comprising: and it is described when there is three groups of valve groups to exit, determine the power reference of each pole of the converter station
Value, comprising:
WhenWhen, pole value and power reference where half pressure operation is set as 4P0；
WhenWhen, pole value and power reference where half pressure operation is set as Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power, P0≤Prated。
Computing module, comprising: the power that each valve group of converter station is calculated based on current commutation station performance number, and count
It calculates and turns for performance number, calculating formula is as follows:
In formula, P0Power before being exited for valve group；P is to turn for power；PAlwaysFor converter station general power；N is the valve group exited
Number, n=1,2,3.
Obviously, described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, all other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above is only the embodiment of the present invention, are not intended to restrict the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (10)
1. a kind of DC transmission system power turns Dai Fangfa, which is characterized in that the described method includes:
When there are when converter station valve group operating condition out of service for the Hybrid HVDC system under asymmetric topology operating condition:
The power of each valve group before converter station valve group exits is calculated based on current commutation station total power value；
Preceding each valve group power is exited based on valve group and exits the value and power reference that valve group quantity resets the converter station.
2. DC transmission system power as described in claim 1 turns Dai Fangfa, which is characterized in that it is described exited based on valve group before
Each valve group power and exit the value and power reference that valve group quantity resets the converter station, comprising:
The operating condition of each pole of the converter station is determined according to the quantity for exiting valve group；
Each valve group power before being exited according to the quantity and valve group that exit valve group, determines the value and power reference of each pole of the converter station；
The value and power reference of the converter station is determined based on the value and power reference of each pole of the converter station；
Wherein, each valve group power of the converter station is equal.
3. DC transmission system power as claimed in claim 2 turns Dai Fangfa, which is characterized in that the basis exits valve group
Quantity determines the operating condition of each pole of the converter station, comprising:
When there is one group of valve group to exit, total pressure operation in pole switchs to the operation of half pressure, another extremely total pressure where the valve group exited
Operation；
When there is two groups of valve groups to exit, if extremely out of service where the valve group that the valve group exited in same pole, exits, separately
One extremely total pressure is run；Otherwise, the two poles of the earth of the converter station switch to the operation of half pressure by total pressure operation simultaneously；
When there is three groups of valve groups to exit, the place that two groups of valve groups all exit is extremely out of service, and another pole switchs to half by total pressure operation
Pressure operation.
4. DC transmission system power as claimed in claim 3 turns Dai Fangfa, which is characterized in that the basis exits valve group
Quantity and valve group exit preceding each valve group power, determine the value and power reference of each pole of the converter station, comprising:
When thering is one group of valve group to exit:
WhenWhen, the value and power reference of pole is set as 2P where half pressure operation0, the power reference of pole where total pressure operation
It is worth constant；
WhenWhen, the value and power reference of pole is set as P where half pressure operationrated, the power ginseng of pole where total pressure operation
It examines value and is set as 4P0-Prated；
WhenWhen, the performance number of pole is set as P where half pressure operationrated, the power of pole where total pressure operation
Value reference value is set as 2Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power, P0≤Prated。
5. DC transmission system power as claimed in claim 3 turns Dai Fangfa, which is characterized in that the basis exits valve group
Quantity and valve group exit preceding each valve group power, determine the value and power reference of each pole of the converter station, comprising:
When thering are two groups of valve groups to exit:
If the valve group exited in same pole, whenWhen, pole value and power reference where total pressure operation is set as 4P0；
WhenWhen, pole value and power reference where total pressure operation is set as 2Prated；
If the valve group exited not in same pole, whenWhen, the two poles of the earth value and power reference is disposed as 2P0；
WhenWhen, the two poles of the earth value and power reference is disposed as 2Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power, P0≤Prated。
6. DC transmission system power as claimed in claim 3 turns Dai Fangfa, which is characterized in that the basis exits valve group
Quantity and valve group exit preceding each valve group power, determine the value and power reference of each pole of the converter station, comprising:
When thering are three groups of valve groups to exit:
WhenWhen, pole value and power reference where half pressure operation is set as 4P0；
WhenWhen, pole value and power reference where half pressure operation is set as Prated；
Wherein, P0Each valve group power before being exited for converter station valve group；PratedFor valve group rated power, P0≤Prated。
7. DC transmission system power as described in claim 1 turns Dai Fangfa, which is characterized in that described currently to be changed based on described
Stream station total power value calculates the power of each valve group of converter station, and calculating formula is as follows:
In formula, P0Each valve group power before being exited for converter station valve group；PAlwaysFor converter station general power.
8. a kind of DC transmission system power turns for system, which is characterized in that the system comprises:
Computing module: for there are converter station valve groups to exit fortune when the Hybrid HVDC system under asymmetric topology operating condition
When capable operating condition；
The performance number of each valve group before converter station valve group exits is calculated based on current commutation station performance number；
Setup module: the converter station is reset for exiting preceding each valve group power based on valve group and exiting valve group quantity
Value and power reference.
9. DC transmission system power as claimed in claim 8 turns for system, which is characterized in that set module, comprising: the
One determines that submodule, second determine that submodule and third determine submodule；
Described first determines submodule, for determining the operating condition of each pole of the converter station according to the quantity for exiting valve group；
Described second determines submodule, for according to exit the quantity of valve group and valve group exit before each valve group power, determine described in
The value and power reference of each pole of converter station；
The third determines submodule, for determining the power of the converter station based on the value and power reference of each pole of the converter station
Reference value；
Wherein, each valve group power of the converter station is equal.
10. DC transmission system power as claimed in claim 9 turns for system, which is characterized in that described second determines submodule
Block, comprising: first exits unit, second exits unit and third exits unit；
Described first exits unit, and total pressure operation in pole switchs to where the valve group for exiting when there is one group of valve group to exit
Half pressure operation, another extremely total pressure operation；
Described second exits unit, for when there is two groups of valve groups to exit, if the valve group exited, in same pole, that exits is described
It is extremely out of service where valve group, another extremely total pressure operation；Otherwise, the two poles of the earth of the converter station switch to half by total pressure operation simultaneously
Pressure operation；
The third exits unit, for when there is three groups of valve groups to exit, the place that two groups of valve groups all exit to be extremely out of service, separately
One pole switchs to the operation of half pressure by total pressure operation.
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