CN105449662B - A kind of method of determining direct current isolated operation control measure - Google Patents
A kind of method of determining direct current isolated operation control measure Download PDFInfo
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- CN105449662B CN105449662B CN201510921105.5A CN201510921105A CN105449662B CN 105449662 B CN105449662 B CN 105449662B CN 201510921105 A CN201510921105 A CN 201510921105A CN 105449662 B CN105449662 B CN 105449662B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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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
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides a kind of methods of determining direct current isolated operation control measure, including step 1: formulating voltage control measure in isolated island；Step 2: coordinating the parameter of configuration generator and direct current frequency controller, propose isolated island frequency control measure；Step 3: the frequency fluctuation problem of dc power adjustment operation in analysis isolated island formulates coordinate scheme using direct current frequency controller and dynamo governor；Step 4: analysis direct current switchs to the grid-connected switching impulse of networking from isolated island, and the differentiation definite value scheme of grid-connecting apparatus is arranged.The present invention comprehensively considers voltage when combustion adjustment in isolated island operates, frequency stabilization requirement, coordinates and optimizes the control parameter of direct current and power grid, determines isolated operation control measure, can increase the flexibility of direct current transportation, guarantees the stability under direct current isolated island power delivery mode.
Description
Technical field
The present invention relates to direct current isolated operation fields, and in particular to a kind of side of determining direct current isolated operation control measure
Method.
Background technique
In bulk power grid interconnection technique, the control of direct current mutual contact mode Power Exchange is flexible, convenient, it can be achieved that non-between power grid
It runs simultaneously and is isolated.With comprehensive raising of HVDC Transmission Technology level, DC power transmission line voltage class is continuously improved, defeated
Capacitance is increasing, and energy delivery efficiency increases accordingly, while also to the operation of electric system, more stringent requirements are proposed.
The DC transmission system method of operation includes two kinds, and one is common network operation modes, and one is isolated operations
Mode.Network operation mode refers to that two sides converter station and major network keep the method for operation of networking operation.Isolated island mode refers to the change of current
The plant stand and railway superstructures independence mini system stood and closed on, disconnection exchange the method for operation contacted with major network.For far from trunk
The Large Hydropower Plant of rack or thermal power plant, if several generators of sending end power grid have by the way of D.C. high voltage transmission
Sending end decoupled mode may be at this moment formed with change of current bus group net operation.Under decoupled mode, direct current system
When transmission power is larger, if the capacity of short circuit of system is smaller, belong to weak AC system, AC and DC system is disturbed at this time
Dynamic, failure etc. will bring great risk to the stable operation of system.If not can guarantee the stabilization of direct current sending end islanded system
The ability of supplying electric power for limiting direct current in some cases then even can not be arranged power transmission, cause the renewable resources such as water power by operation
Waste and the shortage of electric power regional by electricity.Direct current isolated operation control measure are not sufficiently stable at present, not can guarantee direct current isolated island fortune
Voltage is out-of-limit when row, mains frequency is stablized.
To sum up, a kind of flexibility that can increase direct current transportation is provided, is guaranteed under the power grid islanding situations of direct current near region straight
Streaming electricity, improves the power transmission electricity of the mating power plant of direct current, and guarantees that the method for the stability of direct current isolated operation seems especially heavy
It wants.
Summary of the invention
In order to meet the needs of prior art, the present invention provides a kind of sides of determining direct current isolated operation control measure
Method guarantees that voltage is not out-of-limit when direct current isolated operation, mains frequency is stable:
The method includes the following steps:
Step 1: formulating voltage control measure in direct current isolated island；
Step 2: formulating direct current isolated island frequency control measure；
Step 3: frequency fluctuation problem caused by dc power adjusts in analysis isolated island utilizes direct current frequency controller and hair
Machine governor formulates coordinate scheme；
Step 4: analysis direct current switchs to the grid-connected switching impulse of networking from isolated island, and the differentiation of setting isolated island grid-connecting apparatus is fixed
Value scheme.
Preferably, in the step 1, overtension problem when the formulation includes: analysis direct current isolated island small-power operation,
Optimal Filter service condition, optimization low-pressure reactive compensation equipment service condition and optimization generator service condition.
Preferably, in the step 2, the formulation includes: to analyze direct current to switch to event in isolated island or direct current isolated island from networking
Frequency fluctuation problem under barrier disturbance, coordinates the parameter of configuration dynamo governor and direct current frequency controller；
The isolated island frequency control measure, comprising:
(1) isolated island and major network interconnection take emergency lifting after disconnecting or reduce the control measure of dc power；
(2) direct current takes the urgent control measure for reducing dc power after unit tripping occurs in isolated island；
(3) control of the excision power generating set equal with monopole locking power is arranged when monopole locking occurs for direct current
It applies.
Further, the small-power refers to the active power of direct current conveying close to the least work technically allowed
Rate；
The overtension refers to that, due to idle surpluses a large amount of in isolated island, leading to network voltage is more than that equipment allows
Limit；
The Optimal Filter service condition is that Reactive Power Control is changed to manual mode from automatic mode；
The optimization low-pressure reactive compensation equipment service condition is to exit low appearance, the investment of substation and converter station in isolated island
It is low anti-；
The optimization generator service condition is that generator is allowed to be in leading phase operation state, absorbing reactive power.
Further, the direct current switchs to the interconnection that isolated island is direct current and major network from networking and is disconnected, and direct current enters orphan
The island method of operation；
Direct current occurs when the direct current isolated island internal fault is direct current isolated operation and is latched failure, generator tripping failure；
The parameter for coordinating configuration dynamo governor and direct current frequency controller, comprising:
(1) dead zone range that direct current frequency controller is arranged is less than the dead zone range of dynamo governor；
(2) reduce the clipping range of direct current frequency controller；
(3) increase the gain coefficient of direct current frequency controller.
Preferably, in the step 3, the dc power adjustment includes: that direct current transmission power is increased or decreased in isolated island；
The coordinate scheme is that active accommodation generator power influences isolated island frequency, and direct current is connect by direct current frequency controller
It receives frequency variation and adjusts power therewith.
Preferably, in the step 4, the direct current switchs to network from isolated island, comprising: by closing route or bus-tie circuit breaker
Isolated island is incorporated to major network；
The differentiation definite value scheme of the isolated island grid-connecting apparatus, comprising: differential seat angle, voltage when isolated island grid-connecting apparatus two sides
When difference and difference on the frequency are respectively less than the definite value being arranged, it is grid-connected that isolated island grid-connecting apparatus enables route or bus-tie circuit breaker act.
Compared with the immediate prior art, the excellent effect of the present invention is that:
1, in technical solution of the present invention, it is contemplated that the optimization of the investment of the absolute minimum filters of direct current, low-voltage reactive power are mended
Repay the control of equipment and generator into equal various combination measures to voltage；
2, in technical solution of the present invention, the measure of optimization direct current frequency controller and dynamo governor is proposed, is improved
Isolated island frequency stability；
3, in technical solution of the present invention, the method for the definite value of optimization isolated island grid-connecting apparatus is proposed, it is true using simulation analysis
Fixed grid-connected definite value；
4, the present invention is suitable for the DC transmission system that runs of isolated island mode, by isolated island voltage and isolated island frequency
The ability to transmit electricity of DC transmission system greatly improved in the implementation for jointly controlling scheme, increases the power generation effect of the mating power plant of direct current
Benefit reduces the power shortage of direct current receiving end regional peak time.
Detailed description of the invention
A kind of attached drawing 1: method flow diagram of determining direct current isolated operation control measure in the embodiment of the present invention；
Attached drawing 2: bright and beautiful Su Zhiliu isolated island near region power grid schematic diagram；
Attached drawing 3: isolated island occurrence frequency oscillogram before parameter optimization.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description.
The method provided by the invention for promoting direct current transportation ability, can increase the power benefit of the mating power plant of direct current, subtract
The power shortage of few direct current receiving end regional peak time, is substantially improved direct current transportation ability under decoupled mode, such as Fig. 1, this
A kind of method flow diagram of the determining direct current isolated operation control measure provided, specific steps are provided are as follows:
Step 1: overtension problem when analysis direct current isolated island small-power operation, complex optimum filter, low-voltage reactive power are mended
The service condition of equipment and generator is repaid, voltage control measure in direct current isolated island are formulated；
Step 2: analysis direct current switchs to the frequency fluctuation problem under the disturbances such as isolated island or direct current isolated island internal fault, association from networking
The parameter of dynamo governor and direct current frequency controller is set in allotment, proposes isolated island frequency control measure；
Step 3: frequency fluctuation problem caused by dc power adjusts in analysis isolated island utilizes direct current frequency controller and hair
Machine governor formulates coordinate scheme；
Step 4: analysis direct current switchs to the grid-connected switching impulse of networking from isolated island, and the differentiation of setting isolated island grid-connecting apparatus is fixed
Value scheme, reply isolated operation fluctuation；
Step 1 middle low power refer to the active power of direct current conveying close to the minimum power technically allowed,
Generally the 10% of rated power, the reactive power of DC consumption is less than the power of filter injection, idle function in isolated island at this time
The a large amount of surpluses of rate；
The overtension refers to that, due to idle surpluses a large amount of in isolated island, leading to network voltage is more than that equipment allows
Limit；
The Optimal Filter service condition refers to being changed to put into manually from automatically engaging by filter investing method,
The investment of one group of filter can then be reduced；Optimize low-pressure reactive compensation equipment service condition, refers to exiting power transformation in isolated island
It stands and the low appearance of converter station, investment is low anti-；The service condition for optimizing generator, refers to that generator is allowed to be in leading phase operation shape
State, absorbing reactive power.
Direct current switchs to isolated island and refers to that the interconnection of direct current and major network is disconnected from networking in the step 2, and direct current enters
Decoupled mode, general in isolated island only includes direct current, generator, it is also possible to including a small amount of load；In the direct current isolated island
Disturbance occurs and refers to that direct current locking failure, generator tripping etc. occur when direct current isolated operation causes unbalanced power in isolated island
The case where.
The parameter of the coordination configuration dynamo governor and direct current frequency controller refers to: (1) direct current frequency is arranged
The dead zone range of controller is less than the dead zone range of dynamo governor, with using DC control, more rapidly stable advantage reduces
Frequency fluctuation range；(2) reduce the clipping range of direct current frequency controller to reduce fluctuation；(3) increase direct current frequency controller
Gain coefficient with increase control frequency effect.
The isolated island frequency control measure, comprising: (1) control between isolated island and major network dominant eigenvalues in lesser value；(2)
Isolated island and major network interconnection take emergency lifting after disconnecting or reduce the control measure of dc power；(3) unit occurs in isolated island
Direct current takes the urgent control measure for reducing dc power after tripping；(4) power excision and the list when monopole locking occur for direct current
Pole is latched the control measure of the equal generating set of power.
Dc power adjustment refers in the step 3: direct current transmission power is increased or decreased in isolated island.Adjustment is taken to send out
Power of motor, direct current are in such a way that direct current frequency controller adjustment power follows, and frequency fluctuation range is no more than straight in isolated island
The dead zone for flowing frequency controller, can reduce frequency fluctuation range.And adjustment dc power, generator is taken to follow by governor
The mode of adjustment, since governor dead time is larger, adjustment is slower, frequency fluctuation is larger.It is therefore proposed that taking adjustment generator function
Rate, direct current are in such a way that direct current frequency controller adjustment power follows.After having carried out once-through operation, adjusted using generator lonely
Frequency in island, so that frequency fluctuation control is in lesser range.
Direct current refers to opening by closing route or bus from the operation that isolated island mode switchs to networking mode in the step 4
It closes and isolated island is incorporated to major network.The definite value of the isolated island grid-connecting apparatus refers to differential seat angle, voltage difference and the frequency of isolated island grid-connecting apparatus
Rate difference definite value, when the differential seat angle of isolated island grid-connecting apparatus two sides, voltage difference and difference on the frequency are respectively less than the definite value being arranged, isolated island is grid-connected
It is grid-connected that device enables route or bus-tie circuit breaker act, and can reduce the grid-connected impact caused by power grid at this time.When this definite value setting compared with
Hour, advantage is small to power grid impact, and definite value requirement is not achieved the disadvantage is that fluctuating in isolated island and may cause operating status amount, can not
It is grid-connected；When the setting of this definite value it is larger when, advantage is to be easy to reach grid-connected conditions and smoothly grid-connected, the disadvantage is that impacting to power grid
Greatly.Therefore it needs to simulate grid-connected impact using simulation software, proposes the definite value under operation of power networks stable condition.
Fig. 2 shows near region electric network composition schematic diagrames under brocade Su Zhiliu isolated island mode in the present embodiment；It is mentioned using the present invention
The direct current isolated operation control method of confession under decoupled mode ± 800kV silk screen-Suzhou UHVDC Transmission Lines and orphan
Power grid is controlled in island, specific steps are as follows:
Bright and beautiful Su Zhiliu initial operation stage, mating power supply and near region route are not yet all gone into operation.In a period of transition, bright and beautiful Su Zhiliu
Mating power supply only have land owned by officials power plant, the interconnector of near region and main power grid only has that the enceinte of a city gate-is general to be mentioned double-circuit line (the abbreviation moon is general double
Loop line).The disconnection once moon general double loop breaks down, bright and beautiful Su Zhiliu and land owned by officials power plant (may be there are also sub-load) enter isolated island
Mode.In order to enable direct current can stablize power transmission under island mode, need to propose the isolated operation control measure of reasonable.
Step 1: under direct current decoupled mode, the minimum power of direct current be 360MW (monopole rated power 3600MW,
Minimum power is its 10% i.e. 360MW).Reactive Power Control is changed to manual mode from automatic mode, puts into 2 groups of filters.
In this fashion, to avoid 500kV busbar voltage in isolated island from exceeding the upper limit of 550kV, the voltage control measure that need to be taken include:
2 groups for putting into enceinte of a city gate substation are low anti-, and 4 groups of investment silk screen converter station low-pressure side are low anti-, 2 unit tools of land owned by officials power plant in isolated island
The under-excitation ability of standby host group demand of technical standard.
Under above-mentioned voltage control measure, converter station 500kV busbar voltage is about 547kV after putting into filter, unit into
It is about mutually 10Mvar, meets power grid and power plant's service requirement.
Step 2: bright and beautiful Su Zhiliu initial operation stage only has that the enceinte of a city gate-is general to propose double loop (the abbreviation moon general double back with the interconnection of major network
Line).Month general double loop breaks down simultaneously switch off after, direct current enters decoupled mode.If networking mode next month general double back
The transmission power of line is excessive, then the amplitude of hunting of frequency is larger in isolated island after disconnecting, and may cause the high all protection acts of unit and jumps
Load Shedding According To Frequency device action cutting load in lock or isolated island.After considering certain nargin, the frequency fluctuation peak that is set in analysis
No more than 51Hz, minimum cannot be below 49.3Hz.After the moon general double line down disconnection, the frequency stabilization control that should be taken is arranged
Applying is fast liter/prompt drop dc power.It is calculated using power system simulation software, it is maximum allowable to show that the general double loop of the moon allows
Power is ± 100MW.
Simulation analysis and follow-up test confirm that frequency dead band is arranged between direct current frequency controller and dynamo governor
When unreasonable (dynamo governor dead zone is less than direct current frequency controller dead zone), since dynamo governor first acts, water wheels
The inertia lag of machine system will lead to hunting of frequency.Originally the frequency dead band of machine unit speed regulating device is 0.05Hz in isolated island, lower than straight
The frequency dead band (0.2Hz) of frequency controller is flowed, therefore islanded system vibrates occurrence frequency, as shown in Figure 3.
It is direct current frequency controller dead zone 0.1Hz, dynamo governor dead zone by parameter optimization after being analyzed using this method
0.2Hz, while increasing the adjusting gain of direct current frequency controller more preferably to play its performance.Experiments have shown that, isolated island is frequently after optimization
Rate is stablized, and there is no oscillations.
Step 3: taking adjustment generator power, direct current in such a way that frequency controller adjustment power follows.In debugging
Generator power is reduced into 30MW with the rate of 30MW/min, then dc power under the adjustment of direct current frequency controller power with
Reduction, thus achieved the purpose that dc power decline.Then generator power is adjusted, to control the frequency departure in isolated island
No more than ± 0.2Hz.
Step 4: when the definite value scheme of analysis isolated island grid-connecting apparatus, the moon, general line closed a floodgate some two sides pressure differences by 5%Un side by side
(27.5kV) considers, the angular difference of two sides presses 20 °, 15 ° and 5 ° considerations respectively, and two sides difference on the frequency is examined by 0.2Hz and 0.5Hz respectively
Consider.Analysis by maximum pressure difference, angular difference and frequency difference it is found that calculated, and the moon, general linear heat generation rate impacted 916MW, and system is able to maintain stabilization.It adjusts
It has a try in testing, is put side by side in route or bus-tie circuit breaker provided with different grid-connected definite values.Lesser definite value is used when grid-connected first
Device is grid-connected to reduce impact, and discovery fluctuation is when greatly can not be grid-connected, and it is grid-connected and succeed to use biggish gauge device instead.This
Test situation embodies the superiority of the grid-connected definite value scheme of differentiation of this method proposition.
The present embodiment is suitable for determining the isolated operation control measure of brocade Soviet Union extra-high voltage direct-current, while being suitable for other direct currents
Control measure under the same constraint condition of transmission system determine.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (5)
1. a kind of method of determining direct current isolated operation control measure, which is characterized in that the method includes the following steps:
Step 1: formulating voltage control measure in direct current isolated island；
Step 2: formulating direct current isolated island frequency control measure；
Step 3: frequency fluctuation problem caused by dc power adjusts in analysis isolated island utilizes direct current frequency controller and generator
Governor formulates coordinate scheme；
Step 4: analysis direct current switchs to the grid-connected switching impulse of networking from isolated island, and the differentiation definite value side of isolated island grid-connecting apparatus is arranged
Case；
In the step 1, overtension problem when the formulation includes: analysis direct current isolated island small-power operation, Optimal Filter
Service condition, optimization low-pressure reactive compensation equipment service condition and optimization generator service condition；
The small-power refers to the active power of direct current conveying close to the minimum power technically allowed；
The overtension refers to that, due to idle surpluses a large amount of in isolated island, leading to network voltage is more than that equipment allows the upper limit；
The Optimal Filter service condition is that Reactive Power Control is changed to manual mode from automatic mode；
The optimization low-pressure reactive compensation equipment service condition be exit the low appearance of substation and converter station in isolated island, investment it is low
It is anti-；
The optimization generator service condition is that generator is allowed to be in leading phase operation state, absorbing reactive power；
In the step 4, the differentiation definite value scheme of the isolated island grid-connecting apparatus, comprising: when the angle of isolated island grid-connecting apparatus two sides
When the poor, voltage difference of degree and difference on the frequency are respectively less than the definite value being arranged, it is grid-connected that isolated island grid-connecting apparatus enables route or bus-tie circuit breaker act, should
Definite value is set as different grid-connected definite values.
2. a kind of method of determining direct current isolated operation control measure as described in claim 1, which is characterized in that the step
In 2, it is described formulation include: analyze direct current from networking switch to isolated island or direct current isolated island internal fault disturbance under frequency fluctuation problem,
Coordinate the parameter of configuration dynamo governor and direct current frequency controller；
The isolated island frequency control measure, comprising:
(1) isolated island and major network interconnection take emergency lifting after disconnecting or reduce the control measure of dc power；
(2) direct current takes the urgent control measure for reducing dc power after unit tripping occurs in isolated island；
(3) control measure of the excision generating set equal with monopole locking power when monopole locking occur for direct current.
3. a kind of method of determining direct current isolated operation control measure as claimed in claim 2, which is characterized in that the direct current
Switch to isolated island from networking to be disconnected for the interconnection of direct current and major network, direct current enters decoupled mode；
Direct current occurs when the direct current isolated island internal fault is direct current isolated operation and is latched failure, generator tripping failure；
The parameter for coordinating configuration dynamo governor and direct current frequency controller, comprising:
(1) dead zone range that direct current frequency controller is arranged is less than the dead zone range of dynamo governor；
(2) reduce the clipping range of direct current frequency controller；
(3) increase the gain coefficient of direct current frequency controller.
4. a kind of method of determining direct current isolated operation control measure as described in claim 1, which is characterized in that the step
In 3, the dc power adjustment includes: that direct current transmission power is increased or decreased in isolated island；
The coordinate scheme is active accommodation generator power to influence isolated island frequency, and direct current is received by direct current frequency controller
Frequency variation simultaneously adjusts power therewith.
5. a kind of method of determining direct current isolated operation control measure as described in claim 1, which is characterized in that the step
In 4, the direct current switchs to network from isolated island, comprising: isolated island is incorporated to major network by closing route or bus-tie circuit breaker.
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| CN108599192B (en) * | 2018-03-30 | 2020-09-25 | 中国电力科学研究院有限公司 | Power out-of-limit rapid control method and system for connecting island converter station with passive power grid |
| CN110729753A (en) * | 2019-07-03 | 2020-01-24 | 中国南方电网有限责任公司 | Unit frequency and voltage control method suitable for high-voltage direct current sending end island operation |
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| CN103633638A (en) * | 2013-11-06 | 2014-03-12 | 南方电网科学研究院有限责任公司 | Frequency control strategy for multiple DC (Direct Current) send-out island power grid |
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