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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
power
valve group
pole
converter station
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201811376496.7A
Other languages
Chinese (zh)
Other versions
CN109494780B (en
Inventor
李�根
安婷
陆晶晶
梁军
蓝元良
杨杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
State Grid Liaoning Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
State Grid Liaoning Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Global Energy Interconnection Research Institute, State Grid Liaoning Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201811376496.7A priority Critical patent/CN109494780B/en
Publication of CN109494780A publication Critical patent/CN109494780A/en
Application granted granted Critical
Publication of CN109494780B publication Critical patent/CN109494780B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

一种直流输电系统功率转代方法及系统，当处于非对称拓扑工况下的混合直流输电系统存在换流站阀组退出运行的工况时：基于当前换流站总功率值计算换流站阀组退出前各阀组的功率；基于阀组退出前各阀组功率以及退出阀组数量重新设置所述换流站的功率参考值，提高了系统运行的灵活性，尽最大限度的减少了系统功率损失，减少了，电网频率变化，减少切机、切负荷。

A method and system for power generation of a direct current transmission system, when a hybrid direct current transmission system under an asymmetric topology condition has a condition in which a valve group of a converter station is out of operation: calculating the converter station based on the current total power value of the converter station The power of each valve group before the valve group exits; the power reference value of the converter station is reset based on the power of each valve group before the valve group exits and the number of exit valve groups, which improves the flexibility of system operation and minimizes the The power loss of the system is reduced, the frequency of the power grid changes, and the machine cut and load cut are reduced.

Description

A kind of DC transmission system power turns for method and system
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)

1.一种直流输电系统功率转代方法，其特征在于，所述方法包括：1. A method for power generation in a direct current transmission system, characterized in that the method comprises: 当处于非对称拓扑工况下的混合直流输电系统存在换流站阀组退出运行的工况时：When the hybrid HVDC transmission system under asymmetric topology conditions has the condition that the valve group of the converter station is out of operation: 基于当前换流站总功率值计算换流站阀组退出前各阀组的功率；Calculate the power of each valve group before the valve group of the converter station exits based on the current total power value of the converter station; 基于阀组退出前各阀组功率以及退出阀组数量重新设置所述换流站的功率参考值。The power reference value of the converter station is reset based on the power of each valve group before the valve group is withdrawn and the number of withdrawn valve groups. 2.如权利要求1所述的直流输电系统功率转代方法，其特征在于，所述基于阀组退出前各阀组功率以及退出阀组数量重新设置所述换流站的功率参考值，包括：2 . The method for power generation in a DC power transmission system according to claim 1 , wherein the power reference value of the converter station is reset based on the power of each valve group before the valve group exits and the number of exit valve groups, comprising: 2 . : 根据退出阀组的数量确定所述换流站各极的运行情况；Determine the operation status of each pole of the converter station according to the number of exit valve groups; 根据退出阀组的数量和阀组退出前各阀组功率，确定所述换流站各极的功率参考值；Determine the power reference value of each pole of the converter station according to the number of exiting valve groups and the power of each valve group before the valve group exits; 基于所述换流站各极的功率参考值确定所述换流站的功率参考值；determining the power reference value of the converter station based on the power reference value of each pole of the converter station; 其中，所述换流站各阀组功率相等。Wherein, the power of each valve group of the converter station is equal. 3.如权利要求2所述的直流输电系统功率转代方法，其特征在于，所述根据退出阀组的数量确定所述换流站各极的运行情况，包括：3. The method for power generation in a direct current transmission system according to claim 2, wherein the determining the operation status of each pole of the converter station according to the number of exit valve groups, comprising: 当有一组阀组退出时，退出的所述阀组所在极全压运行转为半压运行，另一极为全压运行；When one group of valve groups exits, the operation of the exiting valve group at the pole of full pressure is changed to the operation of half pressure, and the operation of the other pole of full pressure; 当有两组阀组退出时，若退出的阀组在同一极，则退出的所述阀组所在极停止运行，另一极为全压运行；否则，所述换流站的两极同时由全压运行转为半压运行；When two groups of valve groups exit, if the exiting valve groups are in the same pole, the exiting valve group stops running at the pole where the exiting valve group is located, and the other pole runs at full pressure; otherwise, the two poles of the converter station are simultaneously operated by full pressure. The operation is changed to half pressure operation; 当有三组阀组退出时，两组阀组都退出的所在极停止运行，另一极由全压运行转为半压运行。When three groups of valve groups exit, the pole where the two groups of valve groups exit will stop running, and the other pole will change from full-pressure operation to half-pressure operation. 4.如权利要求3所述的直流输电系统功率转代方法，其特征在于，所述根据退出阀组的数量和阀组退出前各阀组功率，确定所述换流站各极的功率参考值，包括：4 . The method for power generation in a DC transmission system according to claim 3 , wherein the power reference of each pole of the converter station is determined according to the number of exiting valve groups and the power of each valve group before the valve group exits. 5 . values, including: 有一组阀组退出时：When one group of valve groups is withdrawn: 当时，半压运行所在极的功率参考值设置为2P0，全压运行所在极的功率参考值不变；when When , the power reference value of the pole where the half-voltage operation is located is set to 2P 0 , and the power reference value of the pole where the full-voltage operation is located remains unchanged; 当时，半压运行所在极的功率参考值设置为Prated，全压运行所在极的功率参考值设置为4P0-Prated；when When , the power reference value of the pole where the half-voltage operation is located is set to P rated , and the power reference value of the pole where the full-voltage operation is located is set to 4P 0 -P rated ; 当时，半压运行所在极的功率值设置为Prated，全压运行所在极的功率值参考值设置为2Prated；when When , the power value of the pole where the half-voltage operation is located is set to P rated , and the reference value of the power value of the pole where the full-voltage operation is located is set to 2P rated ; 其中，P0为换流站阀组退出前各阀组功率；Prated为阀组额定功率，P0≤Prated。Among them, P 0 is the power of each valve group before the valve group of the converter station exits; P rated is the rated power of the valve group, P 0 ≤P rated . 5.如权利要求3所述的直流输电系统功率转代方法，其特征在于，所述根据退出阀组的数量和阀组退出前各阀组功率，确定所述换流站各极的功率参考值，包括：5 . The method for power generation in a direct current transmission system according to claim 3 , wherein the power reference of each pole of the converter station is determined according to the number of exiting valve groups and the power of each valve group before the valve group exits. 6 . values, including: 有两组阀组退出时：When there are two groups of valve groups withdrawn: 若退出的阀组在同一极，当时，全压运行所在极功率参考值设置为4P0；If the exiting valve group is in the same pole, when When , the reference value of the pole power where the full voltage operation is located is set to 4P 0 ; 当时，全压运行所在极功率参考值设置为2Prated；when When , the power reference value of the pole where full voltage operation is located is set to 2P rated ; 若退出的阀组不在同一极，当时，两极功率参考值均设置为2P0；If the exiting valve group is not in the same pole, when When the power reference value of both poles is set to 2P 0 ; 当时，两极功率参考值均设置为2Prated；when , both poles power reference value is set to 2P rated ; 其中，P0为换流站阀组退出前各阀组功率；Prated为阀组额定功率，P0≤Prated。Among them, P 0 is the power of each valve group before the valve group of the converter station exits; P rated is the rated power of the valve group, P 0 ≤P rated . 6.如权利要求3所述的直流输电系统功率转代方法，其特征在于，所述根据退出阀组的数量和阀组退出前各阀组功率，确定所述换流站各极的功率参考值，包括：6 . The method for power generation in a DC power transmission system according to claim 3 , wherein the power reference of each pole of the converter station is determined according to the number of exiting valve groups and the power of each valve group before the valve group exits. 7 . values, including: 有三组阀组退出时：When there are three groups of valve groups withdrawn: 当时，半压运行所在极功率参考值设置为4P0；when , the reference value of the pole power where the half-voltage operation is located is set to 4P 0 ; 当时，半压运行所在极功率参考值设置为Prated；when When , the power reference value of the pole where the half-voltage operation is located is set to P rated ; 其中，P0为换流站阀组退出前各阀组功率；Prated为阀组额定功率，P0≤Prated。Among them, P 0 is the power of each valve group before the valve group of the converter station exits; P rated is the rated power of the valve group, P 0 ≤P rated . 7.如权利要求1所述的直流输电系统功率转代方法，其特征在于，所述基于所述当前换流站总功率值计算换流站各阀组的功率，计算式如下：7. The method for power generation in a direct current transmission system according to claim 1, wherein the calculation of the power of each valve group of the converter station based on the total power value of the current converter station, the calculation formula is as follows: 式中，P0为换流站阀组退出前各阀组功率；P总为换流站总功率。In the formula, P 0 is the power of each valve group before the valve group of the converter station exits; P is the total power of the converter station. 8.一种直流输电系统功率转代系统，其特征在于，所述系统包括：8. A power generation system for a direct current transmission system, wherein the system comprises: 计算模块：用于当处于非对称拓扑工况下的混合直流输电系统存在换流站阀组退出运行的工况时；Calculation module: used when the hybrid HVDC transmission system under asymmetric topology conditions has the condition that the valve group of the converter station is out of operation; 基于当前换流站功率值计算换流站阀组退出前各阀组的功率值；Calculate the power value of each valve group before the exit of the converter station valve group based on the current converter station power value; 设置模块：用于基于阀组退出前各阀组功率以及退出阀组数量重新设置所述换流站的功率参考值。Setting module: used to reset the power reference value of the converter station based on the power of each valve group before the valve group exits and the number of exit valve groups. 9.如权利要求8所述的直流输电系统功率转代系统，其特征在于，所设置模块，包括：第一确定子模块、第二确定子模块和第三确定子模块；9 . The power generation system of a DC power transmission system according to claim 8 , wherein the set module comprises: a first determination sub-module, a second determination sub-module and a third determination sub-module; 10 . 所述第一确定子模块，用于根据退出阀组的数量确定所述换流站各极的运行情况；The first determination sub-module is used for determining the operation status of each pole of the converter station according to the number of exit valve groups; 所述第二确定子模块，用于根据退出阀组的数量和阀组退出前各阀组功率，确定所述换流站各极的功率参考值；The second determination sub-module is configured to determine the power reference value of each pole of the converter station according to the number of withdrawn valve groups and the power of each valve group before the valve group exits; 所述第三确定子模块，用于基于所述换流站各极的功率参考值确定所述换流站的功率参考值；the third determination sub-module, configured to determine the power reference value of the converter station based on the power reference value of each pole of the converter station; 其中，所述换流站各阀组功率相等。Wherein, the power of each valve group of the converter station is equal. 10.如权利要求9所述的直流输电系统功率转代系统，其特征在于，所述第二确定子模块，包括：第一退出单元、第二退出单元和第三退出单元；10 . The power generation system of a DC power transmission system according to claim 9 , wherein the second determination sub-module comprises: a first withdrawal unit, a second withdrawal unit and a third withdrawal unit; 10 . 所述第一退出单元，用于当有一组阀组退出时，退出的所述阀组所在极全压运行转为半压运行，另一极为全压运行；The first exit unit is used for, when one group of valve groups exits, the operation of the exited valve group at the pole of full pressure is changed to the operation of half pressure, and the operation of the other pole of full pressure; 所述第二退出单元，用于当有两组阀组退出时，若退出的阀组在同一极，则退出的所述阀组所在极停止运行，另一极为全压运行；否则，所述换流站的两极同时由全压运行转为半压运行；The second exit unit is used for when two groups of valve groups exit, if the exiting valve groups are in the same pole, the exiting valve group stops running at the pole where the exiting valve group is located, and the other pole runs at full pressure; otherwise, the The two poles of the converter station are changed from full pressure operation to half pressure operation at the same time; 所述第三退出单元，用于当有三组阀组退出时，两组阀组都退出的所在极停止运行，另一极由全压运行转为半压运行。The third exit unit is used to stop the operation of the pole where the two groups of valve groups exit when three groups of valve groups exit, and the other pole changes from full-pressure operation to half-pressure operation.
CN201811376496.7A 2018-11-19 2018-11-19 A method and system for power generation in a direct current transmission system Active CN109494780B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811376496.7A CN109494780B (en) 2018-11-19 2018-11-19 A method and system for power generation in a direct current transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811376496.7A CN109494780B (en) 2018-11-19 2018-11-19 A method and system for power generation in a direct current transmission system

Publications (2)

Publication Number Publication Date
CN109494780A true CN109494780A (en) 2019-03-19
CN109494780B CN109494780B (en) 2022-10-25

Family

ID=65696979

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811376496.7A Active CN109494780B (en) 2018-11-19 2018-11-19 A method and system for power generation in a direct current transmission system

Country Status (1)

Country Link
CN (1) CN109494780B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112054546A (en) * 2019-06-05 2020-12-08 西安许继电力电子技术有限公司 Power coordination method, device and storage medium for multi-drop hybrid DC power transmission system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101647188A (en) * 2007-03-15 2010-02-10 Abb技术有限公司 Method and device for inverting power flow in direct current transmission system
CN104518524A (en) * 2014-12-29 2015-04-15 南京南瑞继保电气有限公司 Method and device for controlling power of withdrawn hierarchically connected direct-current transmission valve group
CN104638665A (en) * 2015-03-06 2015-05-20 南京南瑞继保电气有限公司 Power reversal control method and power reversal control device for hybrid direct-current power transmission system
CN106487033A (en) * 2016-12-15 2017-03-08 南方电网科学研究院有限责任公司 Conversion method and system for converting full voltage into half voltage operation in hybrid direct current transmission system
US20170331390A1 (en) * 2015-08-26 2017-11-16 Zhejiang University An lcc and mmc series-connected hvdc system with dc fault ride-through capability
CN108418228A (en) * 2018-03-28 2018-08-17 许继电气股份有限公司 Active power control method and flexible direct current grid when converter fails
CN108521136A (en) * 2018-04-24 2018-09-11 东南大学 A multi-objective cooperative control method based on true bipolar flexible direct current transmission system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101647188A (en) * 2007-03-15 2010-02-10 Abb技术有限公司 Method and device for inverting power flow in direct current transmission system
CN104518524A (en) * 2014-12-29 2015-04-15 南京南瑞继保电气有限公司 Method and device for controlling power of withdrawn hierarchically connected direct-current transmission valve group
CN104638665A (en) * 2015-03-06 2015-05-20 南京南瑞继保电气有限公司 Power reversal control method and power reversal control device for hybrid direct-current power transmission system
US20170331390A1 (en) * 2015-08-26 2017-11-16 Zhejiang University An lcc and mmc series-connected hvdc system with dc fault ride-through capability
CN106487033A (en) * 2016-12-15 2017-03-08 南方电网科学研究院有限责任公司 Conversion method and system for converting full voltage into half voltage operation in hybrid direct current transmission system
CN108418228A (en) * 2018-03-28 2018-08-17 许继电气股份有限公司 Active power control method and flexible direct current grid when converter fails
CN108521136A (en) * 2018-04-24 2018-09-11 东南大学 A multi-objective cooperative control method based on true bipolar flexible direct current transmission system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
何炎: "基于真双极接线的VSC-MTDC系统功率转代策略", 《电力系统自动化》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112054546A (en) * 2019-06-05 2020-12-08 西安许继电力电子技术有限公司 Power coordination method, device and storage medium for multi-drop hybrid DC power transmission system
CN112054546B (en) * 2019-06-05 2024-04-12 西安许继电力电子技术有限公司 Power coordination method, device and storage medium for multi-drop point hybrid direct current transmission system

Also Published As

Publication number Publication date
CN109494780B (en) 2022-10-25

Similar Documents

Publication Publication Date Title
KR101361865B1 (en) Power flow control in a meshed hvdc power transmission network
CN104320011B (en) Hybrid sub-module MMC converter with direct-current fault ride-through capability
CN102723765B (en) Circuit for DC energy memorizer
US20200212674A1 (en) Control system and control method for parallel converter system
CN104917406B (en) Common-mode-injection-based nearest level modulation method for MMC
US10181799B2 (en) Hybrid back-to-back direct current transmission system and power flow reversal control method
CN108418236B (en) A method for AC fault ride-through of flexible multi-state switches
CN107359638B (en) A Multi-Port DC-DC Transformer System Topology with Stepless Regulation of DC Voltage
CN105429165A (en) Multi-port hybrid DC power transmission system topology for power supply to multi-droppoint passive network and control method of multi-port hybrid DC power transmission system topology
CN116896105A (en) Improvements in or relating to bipolar power transmission networks
WO2001084689A1 (en) Distribution system for electrical power
CN109494780A (en) A kind of DC transmission system power turns for method and system
CN110571782B (en) Energy control circuit and method
CN115864494A (en) A high-voltage multi-port power electronic transformer for county power grid and its operation method
Kalcon et al. HVDC network: Wind power integration and creation of super grid
CN106712070B (en) Method and system for inhibiting commutation failure based on controllable resistor
WO2022252095A1 (en) Multi-inverter parallel system, and grid connection control method for inverter
CN115102217A (en) A method for determining the stable operation domain of MMC at the receiving end of LCC-MMC hybrid cascaded DC power grid
CN114034971A (en) Method, system, device and medium for processing line fault in low-frequency power transmission system
Syamdev et al. HVDC fault tolerant converter for renewable energy source grid
Abouzeid et al. Factors affecting offshore wind power integration to grid through VSC-HVDC
CN110048594A (en) A kind of protective device and wind power generating set of current transformer
CN119341071A (en) Control method and system based on multi-terminal hybrid direct current networking
CN115276032B (en) Through-type flexible traction power supply device based on balanced transformer and MMC
CN108242815A (en) Fan energy storage coordinated frequency modulation system and method for supplementing fan power drop

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant