CN105262136A - Dispatching control method for micro-grid - Google Patents
Dispatching control method for micro-grid Download PDFInfo
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- CN105262136A CN105262136A CN201510802335.XA CN201510802335A CN105262136A CN 105262136 A CN105262136 A CN 105262136A CN 201510802335 A CN201510802335 A CN 201510802335A CN 105262136 A CN105262136 A CN 105262136A
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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Abstract
The invention discloses a dispatching control method for a micro-grid. The three states of the micro-grid are dispatched and controlled respectively; firstly, a starting state is controlled; then, operation states of various components and equipment are monitored circularly; the micro-grid is kept in a steady operation state if no any fault occurs; and the micro-grid is in fault state control if a fault occurs. Renewable energy power generation equipment, conventional energy power generation equipment and energy storage equipment are matched and complementary with each other in the steady operation state; requirements of all levels of loads are commonly satisfied; and thus, the micro-grid operates stably and reliably.
Description
Technical field
The present invention relates to technical field of power systems, particularly a kind of dispatch control method of micro-capacitance sensor.
Background technology
Tapping a new source of energy and regenerative resource, is the inevitable choice solving energy scarcity, problem of environmental pollution.Multiple distributed power source, energy storage, load can effectively manage by optimum mode by micro-capacitance sensor, realize efficient, reliable, economical operation, improve comprehensive utilization rate of energy source.Therefore form distributed power source being built into micro-capacitance sensor is run, and will greatly improve security reliability and the economic benefit of distributed power generation.Micro-capacitance sensor refer to collected by distributed power source, energy storage device, energy converter, associated loadings and monitoring, protective device be small-sizedly transported to electric system; be one can teaching display stand control, the autonomous system of protect and manage; both can be incorporated into the power networks with bulk power grid, again can isolated operation.Chlamydate island, desert, remote mountain areas are not had for bulk power grid, build distributed independent micro-capacitance sensor of providing multiple forms of energy to complement each other, solve local to produce, household electricity problem, be not only safety but also the application mode of high-efficiency and economic.
Because renewable energy power generation has the features such as randomness, discontinuity, energy-flux density be low, extensive direct grid-connected brings very large impact by micro-capacitance sensor, affect its stability and electric power quality, when micro-capacitance sensor is not connected with bulk power grid, this impact is particularly evident.Therefore, study suitable micro-capacitance sensor scheduling controlling strategy, utilize the complementarity of the renewable energy source current of multiple output change at random, cooperatively interact with energy storage and fuel oil, gas electricity generator, building reliable and stable micro-capacitance sensor, is the key technical issues that the independent micro-capacitance sensor generated electricity based on multiple renewable energy sources will solve.
Summary of the invention
The present invention proposes a kind of dispatch control method of micro-capacitance sensor, to strengthen the stability of micro-capacitance sensor, the technical scheme adopted is as follows.
A dispatch control method for micro-capacitance sensor, comprises step:
Enter micro-capacitance sensor starting state control procedure;
After micro-capacitance sensor starting state control procedure all completes, circulatory monitoring micro-capacitance sensor running status, carries out state estimation, has judged whether that fault occurs;
As not having fault to occur, then entering micro-capacitance sensor stable state control procedure, occurring if any fault, then entering micro-capacitance sensor malfunction control procedure,
Described micro-capacitance sensor comprises the element, element monitors equipment and the Dispatching Control System that are connected successively by communication network; Described element comprises micro power, energy storage device, controller switching equipment and load, and each element connects described element monitors equipment by described communication network; Described micro power comprises one or more renewable energy power generation equipment and one or more conventional energy resource generating equipments; Described energy storage device comprises various storage battery or batteries; Described controller switching equipment comprises transformer, distribution line, circuit breaker, switch and disconnecting link; Described load is divided into important load, general load and deferrable load three grades; Described element monitors equipment comprises the various transducer and intelligent monitoring terminal measuring and control needed for described element; Described Dispatching Control System comprises connected collection and supervisory control system and Dispatching Decision-making System, and described collection is connected described intelligent monitoring terminal with supervisory control system by described communication network.
The dispatch control method of micro-capacitance sensor of the present invention, carry out respectively dispatching to three kinds of states of micro-capacitance sensor and control, first starting state control is carried out, the running status of each element and equipment is monitored in recirculation, if do not have fault to occur, remain on steady operational status, if there is fault to occur, then enters malfunction and control.In a stable operation state, renewable energy power generation equipment, conventional energy resource generating equipment and energy storage device cooperatively interact, mutually supplement, and jointly meet the requirement of each stage load, and micro-capacitance sensor is reliablely and stablely run down.
Accompanying drawing explanation
Fig. 1 is example micro-grid system network topological diagram;
Fig. 2 is the overall scheduling controlling flow chart of example micro-capacitance sensor;
Fig. 3 is example micro-capacitance sensor starting state control procedure flow chart;
Fig. 4 is example micro-capacitance sensor stable state control procedure flow chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present invention is described in further details.
The dispatch control method of micro-capacitance sensor of the present invention, comprises step:
Enter micro-capacitance sensor starting state control procedure;
After micro-capacitance sensor starting state control procedure all completes, circulatory monitoring micro-capacitance sensor running status, carries out state estimation, has judged whether that fault occurs;
As not having fault to occur, then entering micro-capacitance sensor stable state control procedure, occurring if any fault, then entering micro-capacitance sensor malfunction control procedure.
Above step the structure of micro-capacitance sensor that is suitable for be: comprise the element, element monitors equipment and the Dispatching Control System that are connected successively by communication network.
Described microgrid element comprises micro power (being called for short micro-source), energy storage device, controller switching equipment, load etc.Described micro-source comprises one or more renewable energy power generation equipment (as wind-driven generator, solar module) and one or more conventional energy resource generating equipments (as fuel electric generator, gas electricity generator).Described energy storage device refers to various storage battery (group).Described controller switching equipment comprises transformer, distribution line, circuit breaker, switch, disconnecting link etc.Described load is divided into important load, general load, deferrable load three grades.Described important load refers to the minimum load that micro-capacitance sensor must ensure, as military, government's electricity consumption; The load that described general load should ensure when referring to that micro-capacitance sensor normally runs, as resident, commercial power; Deferrable load refers to the load that micro-capacitance sensor can be enabled when regenerative resource is superfluous, as cold storage of ice making device, heat pump, sea water desalinating unit etc.
Described watch-dog refers to the intelligent monitoring terminal of monitoring element running status and environment, also comprise the various transducers needed for measuring and controlling, described intelligent monitoring terminal is as photovoltaic DC-to-AC converter, blower fan net-connected controller, battery management system, electric energy meter, Distribution transformer, load management terminal, monitoring of electric power terminal, environment monitor etc.
Described communication network comprises wireline communication network and cordless communication network, and wireline communication network is twisted-pair feeder or coaxial cable, and cordless communication network is any one in data radio station, microwave, mobile communication (GSM/GPRS, 3G/4G).
Described Dispatching Control System is the core of whole micro-capacitance sensor, based on the design of allotment integrated technique, comprises data acquisition analysis system (SCADA), Dispatching Decision-making System.Described SCADA system communicates with watch-dog, Real-time Collection all microgrid elements running status and environmental monitoring data, stored in real-time data base and historical data base after processing by analysis, used for scheduling decision.Described Dispatching Decision-making System is process, the analysis and calculation that the real time data that utilizes SCADA system collection to store and historical data carry out online or off-line, according to micro-capacitance sensor scheduling controlling strategy, form final dispatch command, and be handed down to microgrid watch-dog by SCADA system, control the operational mode of microgrid element.It comprises the functions such as real Time Network State Analysis, Contingency analysis, renewable energy power generation prediction, energy storage prediction, load prediction, distribution transformer monitoring, load management.
Described micro-capacitance sensor scheduling controlling strategy be the highest with system power supply reliability, economy is optimum, energy storage distribution optimum be energy regulation goal, by controlling the switching in each micro-source and load, regulate the transmission power in each micro-source, realize the adjustment of each micro-source interface place voltage and frequency, ensure micro-capacitance sensor safety, reliable, economical operation.
Described micro-capacitance sensor runs and is divided into three states such as micro-capacitance sensor startup, micro-capacitance sensor stable operation, micro-capacitance sensor fault.
As shown in Figure 1, example micro-capacitance sensor comprises 1 50kW roof photovoltaic power generation system, 1 1000kW ground light overhead utility, 1 50kW wind power plant, 1 1000kW diesel generating set, 1 500kVA two way convertor group, 5 500kWh batteries, 4 0.4/10kV transformers, 4 loading zones.Wherein, 50kW roof photovoltaic power generation system is made up of 5 10kW photovoltaic generation units, 1000kW ground light overhead utility is by 4 250kW photovoltaic generation units, 50kW wind power plant is made up of 5 10kW wind power generation units, the diesel engine generator that 1000kW diesel generating set is respectively 500kW, 250kW, 250kW by 3 power forms, and 500kVA two way convertor group is made up of the two way convertor of 2 250kVA.Each transformer all configures 1 Distribution transformer, and each loading zone all configures 1 load management terminal.
As shown in Figure 2, the overall scheduling controlling flow process of example micro-capacitance sensor is: first system enters starting state control procedure, after process to be launched all completes, systemic circulation monitoring micro-capacitance sensor running status, carries out state estimation, sees if there is fault and occur, occur as there is no fault, then enter micro-capacitance sensor stable state control procedure, occur if any fault, then enter micro-capacitance sensor malfunction control procedure.
As shown in Figure 3, example micro-capacitance sensor starting state control procedure is as follows:
Start Dispatching Control System, System self-test;
Successively to the state confirmation of all inlet wires and feeder switch from PCC switch, disjunction state all should be in;
Confirm that energy storage device is in electric discharge permission pattern and arranges, confirm that energy storage device has enough power output capacities;
Start First two way convertor, make it to work in V-F operational mode, energy storage device 2-3 is incorporated to bus, its performance number is designated as P
storage 1.
Drop into loading zone 1 (important load) load, its performance number is designated as P
lotus 1.
Start second two way convertor, make it to work in P-Q operational mode, energy storage device 4-5 is incorporated to bus, its performance number is designated as P
storage 2;
After second two way convertor is grid-connected, drop into loading zone 2 (general load), its performance number is designated as P
lotus 2, progressively regulate current transformer power output to maximum;
Drop into photovoltaic DC-to-AC converter by platform, until whole grid-connected operation, its performance number is designated as P
light;
Drop into wind-driven generator by platform, until all blower fan is incorporated into the power networks, its performance number is designated as P
wind;
Drop into loading zone 3,4 (general load) its performance number according to the output load capability of energy storage device and be designated as P
lotus 3;
Energy storage device 1 is incorporated into the power networks;
System enters micro-capacitance sensor steady operational status.
As Fig. 4, example micro-capacitance sensor stable state control procedure is as follows:
Under the lonely net steady operational status of micro-capacitance sensor, the running status of each equipment of micro-capacitance sensor Dispatching Control System circulatory monitoring microgrid, according to power output and each loading zone load in each micro-source of power-balance relation scheduling of system, scheduling process is as follows:
Calculate the power sum of all photovoltaic generations and wind power generation: P
light+ P
wind,be designated as P
again;
When renewable energy power generation power output is greater than load (comprising important load and general load) power, i.e. P that microgrid must ensure
again>P
lotus 1+ P
lotus 2+ P
lotus 3, now diesel engine unit then first excises it if any input, then in order to realize regenerative resource maximum using, preferentially to energy storage device charging, if also have residue, starts deferrable load;
Work as P
again<P
lotus 1+ P
lotus 2+ P
lotus 3, now deferrable load is as dropped into, and first excises it, then checks whether energy storage device has enough ability to transmit electricities, if also have, continue to run, if not, in order to ensure normal power supply, need the size according to power shortage, select the diesel engine unit combination dropped into;
As above the dynamic equilibrium of microgrid power can be realized, but solar energy and wind energy are all the resources that randomness is very large, if dispatched according to above-mentioned logic merely, diesel engine unit, deferrable load frequent switching may be caused, therefore the necessary smoothing process of method should be taked, specific as follows:
One is setting power margin threshold, is designated as P
valve, then above-mentioned relation formula becomes P
again-(P
lotus 1+ P
lotus 2+ P
lotus 3) >P
valveor P
again-(P
lotus 1+ P
lotus 2+ P
lotus 3) <P
valve;
Two is setting smoothingtimes, and smoothingtime has two, and one is meet power difference relational expression smoothingtime (to be designated as T
1), one is that diesel engine unit or deferrable load switching smoothingtime (are designated as T
2).Only have when power difference relational expression continues to meet the time more than T
1just think that relational expression meets.Diesel engine unit or deferrable load switching time are less than T
2time do not carry out reverse operating;
Three is methods that application load prediction and renewable energy power generation are predicted, realizes the scheduling in advance of micro-source and load.
When micro-capacitance sensor Dispatching Control System be checked through microgrid break down time, system sends dissimilar alarm (minor alarm, significant alarm, high severity alarm) according to fault type (generic failure, important fault, catastrophe failure), until stop microgrid running.
For generic failure, system sends minor alarm, and notice operation maintenance personnel is recovered;
For significant alarm, system sends significant alarm, and notice operation maintenance personnel is recovered.Relevant device is blocked simultaneously, no longer allow to operate on it, unlocked after knowing recovery;
For catastrophe failure, this type of fault generally threatens the safe operation of microgrid, and system is except immediately sending high severity alarm, outside notice operation maintenance personnel is recovered, also should excise line related immediately, if not the fault in important load district, only ensure the power supply in important load district.
To meet an urgent need means as one, when entering lonely net pattern, if energy storage device does not have enough electric energy to support important load, now stand-by power supply fuel electric generator can be set as V/f pattern, set up micro-capacitance sensor reference voltage and frequency.Later control is similar to the control under grid-connect mode, and difference now only ensures that important load is powered, and charge a battery, and do not start general load and deferrable load.
To sum up, under this dispatch control method, the operation that micro-capacitance sensor can be reliable and stable, the independent micro-capacitance sensor of providing multiple forms of energy to complement each other of hundred multikilowatts and above scale is especially suitable for this dispatch control method.
The above embodiment only have expressed the typical execution mode of one of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (5)
1. a dispatch control method for micro-capacitance sensor, is characterized in that, comprises step:
Enter micro-capacitance sensor starting state control procedure;
After micro-capacitance sensor starting state control procedure all completes, circulatory monitoring micro-capacitance sensor running status, carries out state estimation, has judged whether that fault occurs;
As not having fault to occur, then entering micro-capacitance sensor stable state control procedure, occurring if any fault, then entering micro-capacitance sensor malfunction control procedure;
Described micro-capacitance sensor comprises the element, element monitors equipment and the Dispatching Control System that are connected successively by communication network; Described element comprises micro power, energy storage device, controller switching equipment and load, and each element connects described element monitors equipment by described communication network; Described micro power comprises one or more renewable energy power generation equipment and one or more conventional energy resource generating equipments; Described energy storage device comprises various storage battery or batteries; Described controller switching equipment comprises transformer, distribution line, circuit breaker, switch and disconnecting link; Described load is divided into important load, general load and deferrable load three grades; Described element monitors equipment comprises the various transducer and intelligent monitoring terminal measuring and control needed for described element; Described Dispatching Control System comprises connected collection and supervisory control system and Dispatching Decision-making System, and described collection is connected described intelligent monitoring terminal with supervisory control system by described communication network.
2. the dispatch control method of micro-capacitance sensor according to claim 1, is characterized in that, described micro-capacitance sensor starting state control procedure is as follows:
Start described Dispatching Control System, Serial Communication of going forward side by side detects;
Successively all inlet wires and feeder switch, on-load switch state are detected from PCC point, confirm to be in disjunction state;
Confirm that described energy storage device is in electric discharge permission pattern, and have enough power supply capacities;
Start two way convertor, make it to work in V-F operational mode, described energy storage device is incorporated to micro-capacitance sensor;
Drop into important load;
For the micro-capacitance sensor having multiple stage two way convertor, successively by grid-connected for other two way convertor, all work in P-Q pattern;
According to the power-balance relation of micro-capacitance sensor, ensure total load be greater than renewable energy power generation power and the difference of load and renewable energy power generation power be greater than described energy storage device the condition of residue power output under, alternately drop into general load, renewable energy power generation equipment, regulate energy storage device power output, until all renewable energy power generation equipment and general load are incorporated into the power networks;
Micro-capacitance sensor enters isolated power grid pattern.
3. the dispatch control method of micro-capacitance sensor according to claim 2, is characterized in that, described micro-capacitance sensor stable state control procedure is as follows:
Under micro-capacitance sensor isolated power grid pattern, the running status of each element of Dispatching Control System circulatory monitoring, control the switching of each micro power and load according to the power-balance relation of micro-capacitance sensor, regulate the transmission power of each micro power, scheduling process is as follows:
Calculate all renewable energy power generation power output sums;
When renewable energy power generation power output is greater than the load power that micro-capacitance sensor must ensure, the described load that must ensure comprises important load and general load, and dump power preferentially to energy storage device charging, if also have residue, starts deferrable load;
When renewable energy power generation power output is less than the power sum of important load and general load, check whether energy storage device has enough ability to transmit electricities, if enough, continue to run, if deficiency, need the size according to power shortage, select conventional energy resource generating equipment to put into operation, now as deferrable load drops into, excise it.
4. the dispatch control method of micro-capacitance sensor according to claim 3, is characterized in that, described micro-capacitance sensor malfunction control procedure is as follows:
Dispatching Control System is checked through micro-capacitance sensor and breaks down, dissimilar alarm is sent according to fault type, until stop micro-capacitance sensor running, described fault type comprises generic failure, important fault, catastrophe failure, and corresponding alarm is followed successively by minor alarm, significant alarm, high severity alarm;
For generic failure, send minor alarm, notice operation maintenance personnel is recovered;
For significant alarm, send significant alarm, notice operation maintenance personnel is recovered, and is blocked simultaneously, no longer allow to operate on it to related elements or equipment, until unlocked after recovering;
For catastrophe failure, send high severity alarm, notice operation maintenance personnel is recovered, and excises line related, if not the fault in important load district, only ensures the power supply in important load district;
To meet an urgent need means as one, when entering isolated power grid pattern, if energy storage device does not have enough electric energy to support important load, stand-by power supply fuel electric generator is set as V-F pattern, sets up micro-capacitance sensor reference voltage and frequency.
5. the dispatch control method of micro-capacitance sensor according to claim 3, is characterized in that:
Setting power margin threshold and smoothingtime T
1and T
2, the difference of the load power that renewable energy power generation power output and micro-capacitance sensor must ensure is more than or equal to described power difference threshold value, and the duration is greater than described smoothingtime T
1just start the switching of conventional energy resource generating equipment or deferrable load, the switching time of conventional energy resource generating equipment or deferrable load is less than described smoothingtime T
2time do not carry out reverse operating;
The method of application load prediction and renewable energy power generation prediction, realizes the scheduling in advance of micro power and load.
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CN107086670A (en) * | 2017-06-20 | 2017-08-22 | 武汉理工大学 | A kind of multiple-energy-source micro-capacitance sensor charging station experiment porch monitoring system and control method |
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CN111162681A (en) * | 2018-11-08 | 2020-05-15 | 中车永济电机有限公司 | AC-DC-AC type direct-drive permanent magnet traction converter and control method and system thereof |
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CN109784775A (en) * | 2019-02-26 | 2019-05-21 | 国网山东省电力公司莒县供电公司 | A kind of micro-grid system dispatching method and device |
CN111884260A (en) * | 2020-08-05 | 2020-11-03 | 中国华电科工集团有限公司 | Control method of power generation and supply system |
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