CN103078326A - Optimization method for improving safety and stability of grid frequency - Google Patents
Optimization method for improving safety and stability of grid frequency Download PDFInfo
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- CN103078326A CN103078326A CN2012105841095A CN201210584109A CN103078326A CN 103078326 A CN103078326 A CN 103078326A CN 2012105841095 A CN2012105841095 A CN 2012105841095A CN 201210584109 A CN201210584109 A CN 201210584109A CN 103078326 A CN103078326 A CN 103078326A
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention discloses an optimization method for improving safety and stability of grid frequency. The optimization method comprises the following steps of: determining a grid size, grid characteristics, an operation mode and a setting condition of a safety and stability control device of a target power system; determining whether the risk that the grid frequency is out of limit exists after a grid fails; implementing a measure for cutting off a pumped storage power station unit; determining a control measure for power of a speed-up or speed-down direct current line; and selecting starting frequency of the power of the speed-up or speed-down direct current line and determining speed-up or speed-down regulating quantity for power of the direct current line through simulating calculation. According to the optimization method, the frequency stability of the grid after failure is improved by using the control measure for the direct current line and a pumped storage power station, the direct current adjustable capacity and the pumped storage power station in the system can be effectively utilized, the frequency maintenance level of the system after failure is improved, the safety and stability control measures such as cut-off of a power set and load shedding are reduced, and the influence of the failure of the power system on power operation, industrial production and life of people is reduced.
Description
Technical field
The invention belongs to field of power, be specifically related to a kind of optimization method that utilizes DC line and hydroenergy storage station to improve the mains frequency security and stability.
Background technology
One of important symbol of power system stability operation is that system frequency is stable.After frequency stabilization referred to the disturbance of electric power system generation active power, system frequency can keep or return in the scope of permission, not the ability of occurrence frequency collapse.If system's occurrence frequency unstability will cause large-area power outage, consequence is serious.Development along with electric power system generating and technology of transmission of electricity, the single unit heap(ed) capacity reaches 1,000,000 kilowatts at present, wall scroll extra-high voltage AC circuit ability to transmit electricity reaches 5,000,000 kilowatts, and the following UHVDC Transmission Lines ability to transmit electricity that puts into operation will reach 8,000,000 kilowatts, will cause huge power shortage in case break down.Although the scale of electrical network is also in continuous increase, during in the face of jumbo active power vacancy like this, system frequency is stablized risk and is being continued to increase.
At present, the operation means and the control measure that improve mains frequency stability comprise increase unit spinning reserve capacity, dispose and cut high week such as protector and Load Shedding According To Frequency device etc., but all there is obvious deficiency in these measures.Increasing the measure of unit spinning reserve capacity utilizes the frequency modulation function of unit to increase unit output to improve the mains frequency maintenance level can mains frequency descends after fault the time, but will cause unit in the normal power operation of can't overfilling for a long time in service, reduce the generating efficiency of power plant; Dispose the measure of cutting protector high week and can when mains frequency is elevated to a certain degree, automatically excise unit by protective device, thereby but the excision unit will to reduce the voltage support ability in total moment of inertia of system and some areas unfavorable to system stability; The measure of configuration Load Shedding According To Frequency device belongs to the category of electric power system three lines of defence; it is the important safeguard measure of fundamental sum of electric power system; it is minute certain network load of round excision after mains frequency is lower than certain threshold value; although avoided so as far as possible the collapse of system, the power failure that a large amount of loads of loss cause will bring great impact to social production and resident living.
Because operation means and the control measure of existing raising frequency stability exist above many deficiencies, the present invention proposes a kind of optimization method that utilizes DC line in the electrical network and hydroenergy storage station to improve mains frequency stability, by guaranteeing that system frequency reduces the impact on power plant's operation and power load in stable.
Summary of the invention
In order to overcome the defective of prior art, it is stable to the object of the invention is to propose a kind of system frequency that can either guarantee, can also reduce the optimization method on power plant's operation, power load impact.The method is particularly useful for containing the electric power system of DC line and hydroenergy storage station, has not only improved generating efficiency and the economic benefit of power plant, also reduces the economic and social impacts that the power load loss brings.
The present invention is achieved through the following technical solutions:
A kind of optimization method that improves the mains frequency security and stability comprises the steps:
(1) determines the situation of adjusting of electrical network scale, electrical network characteristic, operational mode and the safety and stability control device of target power system;
(2) determine whether there is the out-of-limit risk of mains frequency after electrical network breaks down, if exist, then proceed step (3); Otherwise, finish this optimization method;
(3) measure of enforcement excision hydroenergy storage station unit, this measure comprises:
Cross when low when mains frequency, then excision operates in the hydroenergy storage station unit under the electric pump pattern;
When mains frequency was too high, then excision operated in the hydroenergy storage station unit under the power generation mode;
If after implementing this measure, still there is the risk of frequency out-of-limit in electrical network, then proceeds step (4); Otherwise, finish this optimization method;
(4) according to the regulated quantity of mains frequency rising or reduction situation, direct current sending end or receiving end situation and speed liter or prompt drop DC line power, decide the control measure of speed liter or prompt drop DC line power;
(5) taking to excise on the hydroenergy storage station unit measure basis, select the startup frequency of speed liter or prompt drop DC line power, determine that by simulation calculation DC line power speed rises or the regulated quantity of prompt drop, with the frequency stabilization that guarantees electrical network and avoid loss load and Hydro-Thermal Systems unit.
Further, the described electrical network scale of step (1) comprises the maximum power of network load total amount, generator output total amount, generator spinning reserve ratio, separate unit generator, single power plant and wall scroll transmission line;
Described electrical network characteristic comprise electrical network once with frequency modulation frequency modulation characteristic, load model and LOAD FREQUENCY factor characteristic;
Described operational mode comprises that the circuit mode of connection, interval alternating current interconnection power and DC line send electrical power;
The situation of adjusting of described safety and stability control device comprises the setting value of security and stability control measurement, unit high and low frequency protective device setting value and the electrical network Load Shedding According To Frequency device of electric power system configuration;
Described security and stability control measurement comprise following any one to all: excision generating set, cutting load and circuit off-the-line.
Further, the out-of-limit mains frequency that comprises of the described judgement mains frequency of step (2) is crossed low and the too high two kinds of situations of frequency:
Described mains frequency is excessively low to comprise after the fault that the electrical network low-limit frequency reaches or near the operating frequency that the Load Shedding According To Frequency device is taken turns substantially, the frequency that also comprises electrical network is near or below the Load Shedding According To Frequency device for a long time the special operating value (this moment, there was the Load Shedding According To Frequency device action in electrical network and the risk of losing a large amount of loads) of taking turns;
Described mains frequency is too high comprise that electrical network highest frequency after the fault reaches or near the operating value of the high week protection of generating set (in this moment electrical network generating set may because the protection a large amount of chasers of action and cause system's unstability).
Further, before the measure of implementing excision hydroenergy storage station unit, determine first the round of excision unit, every capacity and every startup frequency of taking turns the excision unit of taking turns the excision unit in the step (3);
The round of excision unit is divided into two-wheeled at least, and it is not cut to keep at least a unit in each power station;
Every capacity of taking turns the excision unit is half of current all unit total capacities in each power station;
The startup frequency of first run excision unit is not more than the difference of rated frequency and mains frequency undulating value, the startup frequency of subsequent passes excision unit is all excised unit less than the first run startup frequency.
Further, will operate in hydroenergy storage station unit under the electric pump pattern in the step (3) and be considered as load, when mains frequency is crossed when low, improve the low-limit frequency of electrical network after the fault by the hydroenergy storage station unit under the excision electric pump pattern; The hydroenergy storage station unit that operates under the power generation mode is considered as generating set, when mains frequency is too high, comes the highest frequency of electrical network behind the Reduction of failure by the hydroenergy storage station unit of excision under the power generation mode.
Further, the control measure of the liter of speed described in the step (4) or prompt drop DC line power comprise:
When mains frequency is too high, if the direct current sending end in this synchronised grids, then speed rises DC line power; If the direct current receiving end in this synchronised grids, prompt drop DC line power then;
When mains frequency is crossed when low, if the direct current sending end in this synchronised grids, prompt drop DC line power then; If the direct current receiving end is in this synchronised grids, then speed rises DC line power.
Further, speed described in the step (4) rises or the regulated quantity of prompt drop DC line power is no more than 1/3rd of rated power, to avoid direct current near region power and change in voltage excessive; In addition, preferably successively all DC line power are regulated according to the descending order of regulated quantity.
Further, the startup set of frequency of the liter of speed described in the step (5) or prompt drop DC line power is synchronously or lags behind the startup frequency that the end wheel excises the hydroenergy storage station unit.
Because than speed liter/faster, better effects if of prompt drop direct current power, can not exert an influence to other electrical networks simultaneously the operate time of excision power station unit as the basis take the measure of excision hydroenergy storage station unit in the step (5).The startup frequency of speed liter/prompt drop direct current measure should be synchronously or is slightly lagged behind the end wheel startup frequency of excising the hydroenergy storage station unit, and it is not out-of-limit to adjust the assurance frequency with as soon as possible startup.Change direct current power speed liter/prompt drop amount, utilize the electric system simulation program to calculate the Ex post frequency of electrical network, when frequency can not cause unit or load loss, be the critical speed of direct current power liter/prompt drop amount.
Compared with the prior art, beneficial effect of the present invention is:
The present invention can apply to exist behind the electric network fault electric power system of frequency out-of-limit or frequency unstability risk, application and enforcement by excision hydroenergy storage station unit and speed liter/prompt drop DC line power method, can reduce or avoid unit and the load loss of electrical network, be a kind of method of important raising mains frequency stability.
After taking the control measure of this invention proposition, can effectively utilize the interior hydroenergy storage station of electric power system and DC line control measure to substitute machine and the cutting load measure of cutting, reduce or avoid cutting machine, cutting load measure amount, thereby reduce after the fault frequency unstability to the impact of power system operation, industrial production and people's lives.
Description of drawings
Fig. 1 is Central China, the North China Power Telecommunication Network structure by extra-high-voltage alternating current interconnection networking provided by the invention, and the Structure of East China Power Grid schematic diagram that links to each other with Central China Power Grid by DC line;
Fig. 2 is the flow chart that utilizes DC line and hydroenergy storage station to improve the optimization method of mains frequency stability provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The below with 1000kV extra-high-voltage alternating current interconnection (hereinafter to be referred as long southern line) fault after, Central China～North China Power Telecommunication Network frequency stability be optimized as example be elaborated.As shown in Figure 2, the concrete steps of this optimization method comprise:
Step (1): the situation of adjusting of determining electrical network scale, electrical network characteristic, operational mode and the safety and stability control device of target power system.The electrical network of present embodiment research comprises Central China, North China, three large regional grids in East China.Under 2011 end of the year typical operation modes, Central China Power Grid is loaded about 9,000 ten thousand kilowatts, and North China Power Telecommunication Network is loaded about 1.2 hundred million kilowatts, and East China Power Grid is loaded about 1.5 hundred million kilowatts, and the meritorious frequency factor of load gets 1.8.Central China Power Grid is take Hydropower Unit as main, and North China and East China Power Grid be take fired power generating unit as main, the equal reserve capacity without spin of generating set in each electrical network.Main electric network composition as shown in Figure 1.Wherein, Central China～North China Power Telecommunication Network is interconnected by long southern line, and North China Power Telecommunication Network send 5,000,000 kilowatts of electricity by long southern alignment Central China Power Grid.Central China Power Grid links to each other (comprising imperial political affairs direct current, suitable magnificent direct current etc.) by many times DC line with East China Power Grid, and Central China Power Grid is the direct current sending end, and East China Power Grid is the direct current receiving end.The large-scale pumped storage power power station of Central China Power Grid comprises Bailianhe power station and power station, black elk peak, and two station installed capacitys are 1,200,000 kilowatts, totally 240 ten thousand kilowatts.The startup frequency values that Central China Power Grid Load Shedding According To Frequency device is taken turns substantially is 49.0Hz, and electrical network is lower than this frequency and will causes a large amount of loads cut.Consider the consideration of operation of power networks uncertain factor and margin of safety, be not less than 49.3Hz as the not out-of-limit condition of frequency with mains frequency during Simulation Analysis.
Step (2): target power system is carried out comprehensive stability analysis, and whether have the mains frequency risk of out-of-limit (comprising that frequency is too high or too low) after breaking down in definite electrical network; The requirement of the basis " guiding rules of power system safety and stability " that comprehensive stability analysis refers to, rear Systems balanth occurs in N-1 fault and the N-2 fault analyzed in the electrical network.Analyze and find, after the long southern line of ultra high voltage breaks down and disconnects, 5,000,000 kilowatts of Central China Power Grid wasted powers, the Central China Power Grid low-limit frequency reaches 48.17Hz after the fault, will cause about 3,000,000 kilowatts of Load Shedding According To Frequency device action loss load.Therefore can take method among the present invention to improve the frequency stability of Central China Power Grid after the fault, avoid load loss.
Step (3): based on the result of step (2), if there is the risk of frequency out-of-limit in electrical network, then after fault, take to excise the unit (mains frequency is crossed when hanging down) under the hydroenergy storage station electric pump pattern or the measure of excising the unit (when mains frequency is too high) under the pump storage plant generator pattern.After the conditions such as definite unit excision round, each wheel startup frequency, further take again corresponding excision measure.
Before the measure of implementing excision hydroenergy storage station unit, preferably determine first the round of excision unit, every capacity and every startup frequency of taking turns the excision unit of taking turns the excision unit.Determine the excision hydroenergy storage station cut the round of power station unit the time; need consideration on the impact of power station equipment safety; there are many units in the same runner in general power station; if the whole units of once resecting are with damage equipment; therefore normal minute two-wheeled or many rounds excision unit, and keep a unit and avoid full factory to shut down.The frequency fluctuation that the startup frequency of the first round needs to avoid electrical network when normally moving, can in time move after fault again avoids mains frequency further to worsen, subsequent passes need to guarantee fast as far as possible startup under the prerequisite of device security, therefore needs to determine according to frequency characteristic after mains frequency fluctuation situation and the fault in practice.Start the conditions such as frequency at definite unit excision round, each wheel after, utilize the electric system simulation program to calculate the frequency situation of electrical network after the fault.
In this example, according to Bailianhe Pumped-storage Power Station and black elk peak hydroenergy storage station device security code requirement, should avoid excising simultaneously the whole units in the same runner and damage power station equipment, therefore minute two-wheeled excision unit.Therefore the mains frequency fluctuation determines that all less than 0.3Hz the startup frequency of first run excision unit measure is that rated power is 50Hz in this example of 49.7Hz(in the actual motion).When being down to 49.7Hz, excises mains frequency the power station unit (1,200,000 kilowatts) of half capacity.Calculate and find, mains frequency continues to reduce behind the unit of excision power station.The second startup frequency of taking turns is made as 49.5Hz, excises 600,000 kilowatts hydroenergy storage station unit, unit of each power station residue.After taking above-mentioned measure of cutting the power station unit, mains frequency descends and slows down, but because the electric network active power shortage is excessive, mains frequency still can be down to below the 49.0Hz, causes the Load Shedding According To Frequency device action.The startup frequency of described other round (being that second in this example taken turns) need be arranged to the startup frequency less than first run excision unit, and concrete data can decide according to the speed that mains frequency rises or descends; The speed that rises or descend is faster, and then the startup frequency of other round (being that second in this example taken turns) just more starts frequency near the first run.
Step (4): based on the result of step (3), according to the regulated quantity of mains frequency rising or reduction situation, direct current sending end or receiving end situation and speed liter or prompt drop DC line power, decide the control measure of speed liter or prompt drop DC line power.Because there is meritorious power shortage in electrical network, and therefore DC line sending end to be adjusted needs the prompt drop direct current power in the Central China Power Grid side.Therefore the direct current that selection is positioned at ultra high voltage faulty line near region is conducive to communications, more can reduce the impact on electric network swim, determines to adjust the dragon woods maple direct current of having stable political situation.Article two, the rated power of direct current is 3,000,000 kilowatts, and every maximum capable of regulating amount of direct current is made as 1,000,000 kilowatts, 2,000,000 kilowatts of total capable of regulating amounts.
Step (5): select speed to rise or the startup frequency of prompt drop DC line power, determine that DC line power speed rises or the regulated quantity of prompt drop (this simulation calculation can adopt the mode in " power system digital simulation " in the reference paper 1 to realize) by simulation calculation of the prior art.After the difference of having analyzed the measure of prompt drop direct current starts the frequency sensitiveness stable to mains frequency, determine that taking turns excision power station unit the 2nd is mains frequency prompt drop direct current power when being down to 49.5Hz.According to above scheme simulation calculation, excision hydroenergy storage station unit and prompt drop direct current power are totally 200 ten thousand kilowatts after the fault.
As shown in table 1 below, if do not take method of the present invention, then finally can cause the Load Shedding According To Frequency device action, affect society and residential electricity consumption; If take method of the present invention, the electrical network low-limit frequency is 49.33Hz, and steady frequency returns to more than the 49.6Hz, both can make each mains frequency keep stable, also can not cause the Load Shedding According To Frequency device action.Concrete condition is as shown in table 1:
The long southern line fault of table 1 ultra high voltage is in the frequency stability of taking the control measure front and back
Present embodiment is applied to the stable control of mains frequency after the long southern line fault of ultra high voltage, is applicable to simultaneously the stable control of system frequency of the high-power surplus of other electrical networks or loss.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
[reference paper 1] " power system digital simulation ", the author: the volumes such as Huang Jiayu, publishing house: China Electric Power Publishing House,
Publication time: 1995-5-1
Claims (8)
1. an optimization method that improves the mains frequency security and stability is characterized in that, comprises the steps:
(1) determines the situation of adjusting of electrical network scale, electrical network characteristic, operational mode and the safety and stability control device of target power system;
(2) determine whether there is the out-of-limit risk of mains frequency after electrical network breaks down, if exist, then proceed step (3); Otherwise, finish this optimization method;
(3) measure of enforcement excision hydroenergy storage station unit, this measure comprises:
Cross when low when mains frequency, then excision operates in the hydroenergy storage station unit under the electric pump pattern;
When mains frequency was too high, then excision operated in the hydroenergy storage station unit under the power generation mode;
If after implementing this measure, still there is the risk of frequency out-of-limit in electrical network, then proceeds step (4); Otherwise, finish this optimization method;
(4) according to the regulated quantity of mains frequency rising or reduction situation, direct current sending end or receiving end situation and speed liter or prompt drop DC line power, decide the control measure of speed liter or prompt drop DC line power;
(5) taking to excise on the hydroenergy storage station unit measure basis, selecting the startup frequency of speed liter or prompt drop DC line power, determining that by simulation calculation DC line power speed rises or the regulated quantity of prompt drop.
2. the method for claim 1 is characterized in that, the described electrical network scale of step (1) comprises the maximum power of network load total amount, generator output total amount, generator spinning reserve ratio, separate unit generator, single power plant and wall scroll transmission line;
Described electrical network characteristic comprise electrical network once with frequency modulation frequency modulation characteristic, load model and LOAD FREQUENCY factor characteristic;
Described operational mode comprises that the circuit mode of connection, interval alternating current interconnection power and DC line send electrical power;
The situation of adjusting of described safety and stability control device comprises the setting value of security and stability control measurement, unit high and low frequency protective device setting value and the electrical network Load Shedding According To Frequency device of electric power system configuration;
Described security and stability control measurement comprise following any one to all: excision generating set, cutting load and circuit off-the-line.
3. the method for claim 1 is characterized in that, the out-of-limit mains frequency that comprises of the described judgement mains frequency of step (2) is crossed low and the too high two kinds of situations of frequency:
Described mains frequency is excessively low to comprise after the fault that the electrical network low-limit frequency reaches or near the operating frequency that the Load Shedding According To Frequency device is taken turns substantially, comprises that also the frequency of electrical network is near or below the special operating value of taking turns of Load Shedding According To Frequency device for a long time;
Described mains frequency is too high to comprise that electrical network highest frequency after the fault reaches or near the operating value of the high week protection of generating set.
4. the method for claim 1 is characterized in that, before the measure of implementing excision hydroenergy storage station unit, determines first the round of excision unit, every capacity and every startup frequency of taking turns the excision unit of taking turns the excision unit in the step (3);
The round of excision unit is divided into two-wheeled at least, and it is not cut to keep at least a unit in each power station;
Every capacity of taking turns the excision unit is half of current all unit total capacities in each power station;
The startup frequency of first run excision unit is not more than the difference of rated frequency and mains frequency undulating value, the startup frequency of subsequent passes excision unit is all excised unit less than the first run startup frequency.
5. such as claim 1 or 4 described methods, it is characterized in that, to operate in hydroenergy storage station unit under the electric pump pattern in the step (3) and be considered as load, when mains frequency is crossed when low, improve the low-limit frequency of electrical network after the fault by the hydroenergy storage station unit under the excision electric pump pattern; The hydroenergy storage station unit that operates under the power generation mode is considered as generating set, when mains frequency is too high, comes the highest frequency of electrical network behind the Reduction of failure by the hydroenergy storage station unit of excision under the power generation mode.
6. the method for claim 1 is characterized in that, speed described in the step (4) rises or the control measure of prompt drop DC line power comprise:
When mains frequency is too high, if the direct current sending end in this synchronised grids, then speed rises DC line power; If the direct current receiving end in this synchronised grids, prompt drop DC line power then;
When mains frequency is crossed when low, if the direct current sending end in this synchronised grids, prompt drop DC line power then; If the direct current receiving end is in this synchronised grids, then speed rises DC line power.
7. such as claim 1 or 6 described methods, it is characterized in that, speed described in the step (4) rises or the regulated quantity of prompt drop DC line power is no more than 1/3rd of rated power, successively all DC line power is regulated according to the order that regulated quantity is descending.
8. the method for claim 1 is characterized in that, the startup set of frequency of the liter of speed described in the step (5) or prompt drop DC line power is synchronously or lags behind the startup frequency that the end wheel excises the hydroenergy storage station unit.
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| CN106780122A (en) * | 2016-12-07 | 2017-05-31 | 中国南方电网有限责任公司 | Frequency fluctuation analysis method and system under the impact of Asynchronous Interconnection system commutation failure |
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| CN109787834A (en) * | 2019-01-25 | 2019-05-21 | 广西电网有限责任公司电力科学研究院 | The calculation method of meter and the nuclear power unit dependent probability of malfunction of operation of power networks parameter |
| CN112202208A (en) * | 2020-09-24 | 2021-01-08 | 广东电网有限责任公司韶关供电局 | Small hydropower station micro-grid generator ad hoc network control method and system |
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