CN105449662A - Method for determining direct current isolated island operation control measures - Google Patents
Method for determining direct current isolated island operation control measures Download PDFInfo
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- CN105449662A CN105449662A CN201510921105.5A CN201510921105A CN105449662A CN 105449662 A CN105449662 A CN 105449662A CN 201510921105 A CN201510921105 A CN 201510921105A CN 105449662 A CN105449662 A CN 105449662A
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- direct current
- isolated island
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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 invention provides a method for determining direct current isolated island operation control measures. The method comprises the following steps of step 1 taking voltage control measures in an isolated island; step 2 carrying out coordinated configuration on parameters of a generator and a direct current frequency controller and providing isolated island frequency control measures; step 3 analyzing a frequency fluctuation problem of a direct current power adjustment operation in the isolated island and utilizing the direct current frequency controller and a generator speed controller to make a coordination scheme; and step 4 analyzing grid-connected switching impulse for converting the direct current into networking from the isolated island and setting a differentiated fixed value scheme of a grid-connected device. The method comprehensively considers voltage and frequency stability requirements during adjustment operation for operation in the isolated island, carries out coordinated optimization on direct current and grid control parameters and determines the isolated island operation control measures, so that the flexibility for direct current power transmission can be increased, and the stability under a direct current isolated island power transmission method is guaranteed.
Description
Technical field
The present invention relates to direct current islet operation field, be specifically related to a kind of method determining direct current islet operation control measure.
Background technology
In bulk power grid interconnection technique, direct current mutual contact mode Power Exchange controls flexibly, conveniently, can realize the asynchronous operation between electrical network and isolation.Along with comprehensive raising of HVDC Transmission Technology level, DC power transmission line electric pressure improves constantly, and transmission line capability is increasing, and energy transfer efficiency improves thereupon, also has higher requirement to the operation of electric power system simultaneously.
DC transmission system operational mode comprises two kinds, and a kind of is common networking operation mode, and one is decoupled mode.Networking operation mode refers to that both sides current conversion station and major network keep the operational mode of networking operation.Isolated island mode refers to current conversion station and the plant stand of closing on and railway superstructures independence mini system, disconnects and exchanges the operational mode contacted with major network.For away from the Large Hydropower Plant of trunk rack or thermal power plant, if adopt the mode of high voltage direct current transmission, some generators of sending end electrical network likely with change of current bus group net operation, at this moment just define sending end decoupled mode.Under decoupled mode, when direct current system transmission power is larger, if the capacity of short circuit of system is less, then belong to weak AC system, the stable operation of the system of giving is brought great risk by the now disturbance, fault etc. of AC and DC system.If the stable operation of direct current sending end islanded system cannot be ensured, then the ability of supplying electric power limiting direct current in some cases even cannot be arranged power transmission, cause the shortage of electric power in the waste of the renewable resources such as water power and powered area.Current direct current islet operation control measure are stable not, and when cannot ensure direct current islet operation, not out-of-limit, the mains frequency of voltage is stablized.
To sum up, provide a kind of flexibility that can increase direct current transportation, under the electrical network islanding situations of direct current near region, ensure direct current power transmission, improve the power transmission electricity of the supporting power plant of direct current, and ensure that the method for the stability of direct current islet operation seems particularly important.
Summary of the invention
In order to meet the demand of prior art, the invention provides a kind of method determining direct current islet operation control measure, during guarantee direct current islet operation, voltage is not out-of-limit, mains frequency stable:
Described method comprises the steps:
Step 1: formulate voltage control measure in direct current isolated island;
Step 2: formulate the measure of direct current isolated island FREQUENCY CONTROL;
Step 3: analyze the frequency fluctuation problem that in isolated island, direct current power adjustment causes, utilizes direct current frequency controller and dynamo governor to formulate coordinate scheme;
Step 4: analyze direct current transfers networking to grid-connected switching impulse from isolated island, the differentiation definite value scheme of isolated island grid-connecting apparatus is set.
Preferably, in described step 1, described formulation comprises: analyze overtension problem when direct current isolated island small-power is run, Optimal Filter service conditions, optimization low-pressure reactive compensation equipment service conditions and optimization generator operation condition.
Preferably, in described step 2, described formulation comprises: analysis direct current turns the frequency fluctuation problem isolated island or the disturbance of direct current isolated island internal fault from networking, coordinate the parameter of configuration generator and direct current frequency controller;
The measure of described isolated island FREQUENCY CONTROL, comprising:
(1) isolated island and major network interconnection are taked emergency lifting or are reduced the control measure of direct current power after disconnecting;
(2) after there is unit tripping in isolated island, direct current takes the control measure promptly reducing direct current power;
(3) control measure of the equal generating set of power are with it excised during the locking of direct current generation one pole.
Further, described small-power refers to the active power of direct current conveying close to the minimum power technically allowed;
Described overtension refers to due to idle surplus a large amount of in isolated island, causes line voltage to exceed equipment and allows the upper limit;
Described Optimal Filter service conditions is for change Reactive Power Control into manual mode from automatic mode;
Described optimization low-pressure reactive compensation equipment service conditions be exit the low appearance of transformer station and current conversion station in isolated island, drop into low anti-;
Described optimization generator operation condition is in leading phase operation state, absorbing reactive power for allowing generator.
Further, it is that the interconnection of direct current and major network is disconnected that described direct current turns isolated island from networking, and direct current enters decoupled mode;
Direct current locking fault, generator tripping fault is there is when described direct current isolated island internal fault is direct current islet operation;
The described parameter coordinating configuration generator and direct current frequency controller, comprising:
(1) dead zone range arranging direct current frequency controller is less than the dead zone range of dynamo governor;
(2) clipping range of direct current frequency controller is reduced;
(3) gain coefficient of direct current frequency controller is increased.
Preferably, in described step 3, described direct current power adjustment comprises: increase in isolated island or reduce direct current transmission power;
Described coordinate scheme is that active accommodation generator power affects isolated island frequency, and direct current is by frequency controller receive frequency variable quantity and Modulating Power thereupon.
Preferably, in described step 4, described direct current transfers networking to from isolated island, comprising: by closing, isolated island is incorporated to major network by circuit or bus-tie circuit breaker;
The differentiation definite value scheme of described isolated island grid-connecting apparatus, comprising: when the differential seat angle of grid-connecting apparatus both sides, voltage difference and difference on the frequency are all less than the definite value of setting, grid-connecting apparatus makes switch motion grid-connected.
Compared with immediate prior art, excellent effect of the present invention is:
1, in technical solution of the present invention, consider the optimization of the input of the absolute minimum filters of direct current, low-pressure reactive compensation equipment and generator and enter equal various combination measure to the control of voltage;
2, in technical solution of the present invention, propose the measure optimizing direct current frequency controller and dynamo governor, improve isolated island frequency stability;
3, in technical solution of the present invention, propose the method for the definite value optimizing isolated island grid-connecting apparatus, adopt simulation analysis to determine grid-connected definite value;
4, the present invention is applicable to the DC transmission system that isolated island mode is run, by to isolated island voltage and isolated island frequency the enforcement jointly controlling scheme, significantly improve the ability to transmit electricity of DC transmission system, increase the power benefit of the supporting power plant of direct current, reduce the power shortage of direct current receiving end area peak time.
Accompanying drawing explanation
Accompanying drawing 1: a kind of method flow diagram determining direct current islet operation control measure in the embodiment of the present invention;
Accompanying drawing 2: bright and beautiful Su Zhiliu isolated island near region electrical network schematic diagram;
Accompanying drawing 3: isolated island occurrence frequency oscillogram before parameter optimization.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described.
The method of lifting direct current transportation ability provided by the invention, the power benefit of the supporting power plant of direct current can be increased, reduce the power shortage of direct current receiving end area peak time, significantly direct current transportation ability under lifting decoupled mode, as Fig. 1, a kind of method flow diagram determining direct current islet operation control measure provided by the invention, concrete steps are:
Step 1: analyze overtension problem when direct current isolated island small-power is run, the service conditions of complex optimum filter, low-pressure reactive compensation equipment and generator, formulates voltage control measure in direct current isolated island;
Step 2: analysis direct current turns the frequency fluctuation problem the disturbance such as isolated island or direct current isolated island internal fault from networking, coordinate the parameter of configuration generator and direct current frequency controller, proposes the measure of isolated island FREQUENCY CONTROL;
Step 3: analyze the frequency fluctuation problem that in isolated island, direct current power adjustment causes, utilizes direct current frequency controller and dynamo governor to formulate coordinate scheme;
Step 4: analyze direct current transfers networking to grid-connected switching impulse from isolated island, the differentiation definite value scheme of grid-connecting apparatus is set, the fluctuation of reply islet operation;
Described step 1 middle low power refers to the active power of direct current conveying close to the minimum power technically allowed, and be generally 10% of rated power, now the reactive power of DC consumption is less than the power that filter injects, a large amount of surplus of reactive power in isolated island;
Described overtension refers to due to idle surplus a large amount of in isolated island, causes line voltage to exceed equipment and allows the upper limit;
Described Optimal Filter service conditions, refers to and changes filter investing method into manual input from automatically dropping into, then can reduce the input of one group of filter; Optimize low-pressure reactive compensation equipment service conditions, refer to exit transformer station and current conversion station in isolated island low appearance, drop into low anti-; Optimize the service conditions of generator, refer to and allow generator be in leading phase operation state, absorbing reactive power.
In described step 2, direct current turns from networking the interconnection that isolated island refers to direct current and major network and is disconnected, and direct current enters decoupled mode, and isolated island is interior generally only comprises direct current, generator, also may comprise a small amount of load; Occur, when disturbance refers to direct current islet operation, direct current locking fault, generator tripping etc. occur in described direct current isolated island and cause the unbalanced situation of isolated island internal power.
Describedly coordinate configuration generator and the parameter of direct current frequency controller refers to: the dead zone range that (1) arranges direct current frequency controller is less than the dead zone range of dynamo governor, reduce frequency fluctuation scope to utilize the advantage of DC control more fast and stable; (2) clipping range of direct current frequency controller is reduced to reduce fluctuation; (3) gain coefficient of direct current frequency controller is increased to increase the effect of control frequency.
The measure of described isolated island FREQUENCY CONTROL, comprising: between (1) control isolated island and major network, dominant eigenvalues is in less value; (2) isolated island and major network interconnection are taked emergency lifting or are reduced the control measure of direct current power after disconnecting; (3) after there is unit tripping in isolated island, direct current takes the control measure promptly reducing direct current power; (4) control measure of the equal generating set of power are with it excised during the locking of direct current generation one pole.
In described step 3, direct current power adjustment refers to: increase in isolated island or reduce direct current transmission power.Take the mode adjusting generator power, direct current is followed by frequency controller Modulating Power, in isolated island, frequency fluctuation scope is no more than the dead band of direct current frequency controller, can reduce frequency fluctuation scope.And take to adjust adjustment followed by direct current power, generator mode by speed regulator, because governor dead time is comparatively large, adjustment is comparatively slow, frequency fluctuation is larger.Therefore the mode that adjustment generator power is taked in suggestion, direct current is followed by frequency controller Modulating Power.After having carried out once-through operation, utilize the frequency in generator adjustment isolated island, frequency fluctuation is controlled in less scope.
In described step 4, direct current refers to from the operation that isolated island mode transfers networking mode to, by close circuit or bus-tie circuit breaker, isolated island is incorporated to major network.The definite value of described isolated island grid-connecting apparatus refers to the differential seat angle of grid-connecting apparatus, voltage difference and difference on the frequency definite value, when the differential seat angle of grid-connecting apparatus both sides, voltage difference and difference on the frequency are all less than the definite value of setting, grid-connecting apparatus makes switch motion grid-connected, now can reduce the grid-connected impact caused electrical network.When this definite value arrange less time, advantage is impacted little to electrical network, and shortcoming is that fluctuation may cause running status amount not reach definite value requirement in isolated island, cannot be grid-connected; When this definite value arrange larger time, advantage easily reaches grid-connected conditions and grid-connected smoothly, shortcoming be electrical network is impacted large.Therefore need to adopt simulation software to simulate grid-connected impact, propose the definite value under operation of power networks stable condition.
Fig. 2 to show in the present embodiment near region electric network composition schematic diagram under bright and beautiful Su Zhiliu isolated island mode; Adopt direct current islet operation control method provided by the invention under decoupled mode ± 800kV silk screen-Suzhou UHVDC Transmission Lines and isolated island in electrical network control, concrete steps are:
Brocade Su Zhiliu initial operation stage, its supporting power supply and near region circuit are not yet all gone into operation.In a period of transition, the supporting power supply Jin You land owned by officials power plant of bright and beautiful Su Zhiliu, the interconnector of near region and main electrical network only has the enceinte of a city gate-Pu to carry double-circuit line (being called for short the general double loop of the moon).Once the moon general double loop to break down disconnection, bright and beautiful Su Zhiliu and land owned by officials power plant (may also have sub-load) enter island mode.In order to make direct current power transmission can be stablized under island mode, need the islet operation control measure proposing reasonable.
Step 1: under direct current decoupled mode, the minimum power of direct current is 360MW (one pole rated power 3600MW, minimum power is its 10% i.e. 360MW).Change Reactive Power Control into manual mode from automatic mode, drop into 2 groups of filters.In this fashion, the upper limit of 550kV is exceeded for avoiding 500kV busbar voltage in isolated island, the voltage control measure that need take comprises: 2 groups low that drop into enceinte of a city gate transformer station resist, 4 groups low that drop into silk screen current conversion station low-pressure side resist, and in isolated island, land owned by officials power plant 2 units possess the under-excitation ability of machine set technology code requirement.
Under above-mentioned voltage control measure, drop into current conversion station 500kV busbar voltage after filter and be about 547kV, unit enters and is about 10Mvar mutually, meets electrical network and power plant's service requirement.
Step 2: bright and beautiful Su Zhiliu initial operation stage, only has the enceinte of a city gate-Pu to carry double loop (being called for short the general double loop of the moon) with the interconnection of major network.After the moon, general double loop broke down disconnection simultaneously, direct current enters decoupled mode.If the transmitted power of networking mode general double loop next month is excessive, then after disconnecting, in isolated island, the amplitude of hunting of frequency is comparatively large, may cause Load Shedding According To Frequency device action cutting load in the high all protection act tripping operations of unit or isolated island.After considering certain nargin, the frequency fluctuation peak set in analysis can not more than 51Hz, and minimum can not lower than 49.3Hz.After the moon general double line down disconnection, the frequency stabilization control measure that should take are speed liter/prompt drop direct current powers.Through adopting power system simulation software to calculate, show that the maximum allowable power that the general double loop of the moon allows is ± 100MW.
Simulation analysis and follow-up test confirm, when between direct current frequency controller and dynamo governor, frequency dead band arranges unreasonable (dynamo governor dead band is less than direct current frequency controller dead band), due to the first action of dynamo governor, the inertia lag of hydraulic turbine system will cause hunting of frequency.Originally in isolated island, the frequency dead band of machine unit speed regulating device is 0.05Hz, and lower than the frequency dead band (0.2Hz) of direct current frequency controller, therefore occurrence frequency vibrates by islanded system, as shown in Figure 3.
After adopting this method to analyze, be direct current frequency controller dead band 0.1Hz, dynamo governor dead band 0.2Hz by parameter optimization, increase the adjustment gain of direct current frequency controller better to play its performance simultaneously.After optimizing, test shows, isolated island frequency stabilization, does not vibrate.
Step 3: take the mode adjusting generator power, direct current is followed by frequency controller Modulating Power.Generator power is reduced 30MW by the speed with 30MW/min in debugging, then direct current power power under the adjustment of frequency controller reduces thereupon, thus reaches the object of direct current power decline.Then adjust generator power, be no more than ± 0.2Hz with the frequency departure controlled in isolated island.
Step 4: when analyzing the definite value scheme of grid-connecting apparatus, the moon, general line closed a floodgate a both sides pressure reduction side by side by 5%Un (27.5kV) consideration, and the angular difference of both sides is respectively by 20 °, 15 ° and 5 ° of considerations, and both sides difference on the frequency is pressed 0.2Hz and 0.5Hz respectively and considered.Analyze known, calculate by maximum pressure reduction, angular difference and frequency difference, the moon, general linear heat generation rate impacted 916MW, and system can keep stable.In debugging test, put side by side at two switches and be provided with different grid-connected definite values.First adopt less gauge device grid-connected to reduce to impact time grid-connected, find fluctuation greatly cannot grid-connected time, use larger gauge device instead grid-connected and succeed.This test situation embodies the superiority of the grid-connected definite value scheme of differentiation that this method proposes.
The present embodiment is applicable to the islet operation control measure determining brocade Soviet Union extra-high voltage direct-current, and the control measure be simultaneously applicable under the same constraints of other DC transmission system are determined.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (7)
1. determine a method for direct current islet operation control measure, it is characterized in that, described method comprises the steps:
Step 1: formulate voltage control measure in direct current isolated island;
Step 2: formulate the measure of direct current isolated island FREQUENCY CONTROL;
Step 3: analyze the frequency fluctuation problem that in isolated island, direct current power adjustment causes, utilizes direct current frequency controller and dynamo governor to formulate coordinate scheme;
Step 4: analyze direct current transfers networking to grid-connected switching impulse from isolated island, the differentiation definite value scheme of isolated island grid-connecting apparatus is set.
2. a kind of method determining direct current islet operation control measure as claimed in claim 1, it is characterized in that, in described step 1, described formulation comprises: analyze overtension problem when direct current isolated island small-power is run, Optimal Filter service conditions, optimization low-pressure reactive compensation equipment service conditions and optimization generator operation condition.
3. a kind of method determining direct current islet operation control measure as claimed in claim 1, it is characterized in that, in described step 2, described formulation comprises: analysis direct current turns the frequency fluctuation problem isolated island or the disturbance of direct current isolated island internal fault from networking, coordinate the parameter of configuration generator and direct current frequency controller;
The measure of described isolated island FREQUENCY CONTROL, comprising:
(1) isolated island and major network interconnection are taked emergency lifting or are reduced the control measure of direct current power after disconnecting;
(2) after there is unit tripping in isolated island, direct current takes the control measure promptly reducing direct current power;
(3) control measure of the equal generating set of power are with it excised during the locking of direct current generation one pole.
4. a kind of method determining direct current islet operation control measure as claimed in claim 2, is characterized in that, described small-power refers to the active power of direct current conveying close to the minimum power technically allowed;
Described overtension refers to due to idle surplus a large amount of in isolated island, causes line voltage to exceed equipment and allows the upper limit;
Described Optimal Filter service conditions is for change Reactive Power Control into manual mode from automatic mode;
Described optimization low-pressure reactive compensation equipment service conditions be exit the low appearance of transformer station and current conversion station in isolated island, drop into low anti-;
Described optimization generator operation condition is in leading phase operation state, absorbing reactive power for allowing generator.
5. a kind of method determining direct current islet operation control measure as claimed in claim 3, is characterized in that, it is that the interconnection of direct current and major network is disconnected that described direct current turns isolated island from networking, and direct current enters decoupled mode;
Direct current locking fault, generator tripping fault is there is when described direct current isolated island internal fault is direct current islet operation;
The described parameter coordinating configuration generator and direct current frequency controller, comprising:
(1) dead zone range arranging direct current frequency controller is less than the dead zone range of dynamo governor;
(2) clipping range of direct current frequency controller is reduced;
(3) gain coefficient of direct current frequency controller is increased.
6. a kind of method determining direct current islet operation control measure as claimed in claim 1, is characterized in that, in described step 3, described direct current power adjustment comprises: increase in isolated island or reduce direct current transmission power;
Described coordinate scheme is that active accommodation generator power affects isolated island frequency, and direct current is by frequency controller receive frequency variable quantity and Modulating Power thereupon.
7. a kind of method determining direct current islet operation control measure as claimed in claim 1, it is characterized in that, in described step 4, described direct current transfers networking to from isolated island, comprising: by closing, isolated island is incorporated to major network by circuit or bus-tie circuit breaker;
The differentiation definite value scheme of described isolated island grid-connecting apparatus, comprising: when the differential seat angle of grid-connecting apparatus both sides, voltage difference and difference on the frequency are all less than the definite value of setting, grid-connecting apparatus makes switch motion grid-connected.
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| 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106203736A (en) * | 2016-07-28 | 2016-12-07 | 华北电力大学 | A kind of formulating method of large-scale Energy Base wind-fire isolated island direct current transportation plan |
| CN106203736B (en) * | 2016-07-28 | 2019-12-10 | 华北电力大学 | method for making wind-fire island direct-current power transmission plan of large energy base |
| CN108599192A (en) * | 2018-03-30 | 2018-09-28 | 中国电力科学研究院有限公司 | A kind of out-of-limit fast control method of power and system of isolated island current conversion station connected with passive power grid |
| 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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| CN105449662B (en) | 2019-05-14 |
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