CN104753084A - Micro-grid system capable of controlling frequency automatically - Google Patents
Micro-grid system capable of controlling frequency automatically Download PDFInfo
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- 238000010248 power generation Methods 0.000 claims abstract description 49
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- H02J3/386—
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/08—Synchronising of 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a micro-grid system capable of controlling frequency automatically. By the micro-grid system, the generation power of a power generation assembly in a micro-grid and load change in the micro-grid can be predicted, frequency information and voltage information of a large grid can be tracked, a dispatching instruction of a large grid is acquired in real time, the capacity of batteries of a storage battery module is detected in real time, a suitable control strategy can be formulated and carried out, the frequency and the voltage of the large grid can be adjusted by the micro-grid according to requirements of the large grid, the safety performance of an energy storage system is improved as much as possible, and the service life of the energy storage system is prolonged as much as possible.
Description
Art
The present invention relates to a kind of micro-grid system that automatically can realize FREQUENCY CONTROL.
Background technology
Micro-capacitance sensor (Micro-Grid) is also translated into microgrid; it is a kind of new network structure; it is the system unit that a group of micro battery, load, energy-storage system and control device are formed; can teaching display stand control, the autonomous system of protect and manage; both can be incorporated into the power networks with external electrical network, also can isolated operation.
Using the micro-capacitance sensor of wind-powered electricity generation and photovoltaic generation as superhigh pressure, the supplementing of remote, bulk power grid powering mode, represent the developing direction that electric power system is new.The motive power of Wind turbines is wind energy, and wind energy makes the power sent of Wind turbines be interval due to the intermittence of wind and stochastic volatility and fluctuates, and the wind energy connecting system of these fluctuations can bring impact to electric power system.Meanwhile, because Wind turbines is asynchronous machine, if do not controlled, while sending active power, need to absorb certain reactive power, do not utilize the voltage stabilization of system.When wind-powered electricity generation permeability is lower, these impacts are not obvious, and along with the raising of wind-powered electricity generation permeability, the impact of wind energy on electric power system increases gradually, cause certain difficulty also to while bringing economic benefit to electric power system the operation of electrical network.
In the electric power system that wind-electricity integration proportion is larger, because Power Output for Wind Power Field has incomplete controllability and expection property, the inertia of the distribution of original electric power system tide, circuit transmission power and whole system can be changed to a certain extent, thus impact is created on meritorious, reactive power equilibrium, frequency and the voltage stabilization of electrical network.When wind-electricity integration runs, the particularly minor scale power net of independent operating, power grid construction is relatively weak, and network re-active power regulating power is less, and the stabilization of power grids sex chromosome mosaicism that wind-electricity integration brings is more obvious.In order to reduce this impact, large-scale energy storage system cooperation can be configured in the system of Wind turbines and photovoltaic plant cogeneration.
The realization of energy storage technology to micro-capacitance sensor plays an important role, and it is applied in the fluctuation and stochastic problems that solve generation of electricity by new energy to a great extent, effectively improves the predictability in intermittent micro-source, certainty and economy.In addition, energy storage technology is at frequency modulation and voltage modulation and improvement system is meritorious, reactive balance level, and the effect improving micro-capacitance sensor stable operation ability aspect also obtain extensively research and proof.In the electric power system that wind-powered electricity generation permeability is higher, when the electric power system frequency of occurrences and change in voltage, require that the real-time of wind accumulation to stability of power system and the quality of power supply is stronger, must according to the real-time status of electric power system, fully take into account the regulating power of wind accumulation, the reliable and economical operation of guarantee electric power system.
Summary of the invention
The invention provides a kind of micro-grid system that automatically can realize FREQUENCY CONTROL, load variations in the generated output of the generating equipment in the measurable micro-capacitance sensor of this micro-grid system and micro-capacitance sensor, traceable bulk power grid frequency, information of voltage, Real-time Obtaining bulk power grid dispatch command, the battery module battery capacity of real-time detection, can formulate and implement optimum control strategy, ensure that micro-capacitance sensor participates in frequency adjustment and the voltage-regulation of bulk power grid when grid-connected according to the demand of bulk power grid, and promote fail safe and the useful life of energy-storage system as far as possible.
To achieve these goals, the invention provides a kind of micro-grid system that automatically can realize FREQUENCY CONTROL, this micro-capacitance sensor comprises: wind power plant, photovoltaic power generation equipment, energy-storage system, AC/DC two-way change of current module one, DC bus, the two-way change of current module two of AC/DC being used for connecting wind power plant, photovoltaic power generation equipment and DC bus, micro-capacitance sensor internal burden and supervising device for being connected with bulk power grid by micro-capacitance sensor and isolating;
The two-way DC/DC converter that this energy-storage system comprises battery module, is connected with above-mentioned DC bus;
This supervising device comprises:
Wind power generation generating equipment monitoring module, for monitoring wind power plant in real time, and predicts the generated output of wind power plant;
Photovoltaic power generation equipment monitoring module, for monitoring photovoltaic power generation equipment in real time, and predicts the generated output of photovoltaic power generation equipment;
Energy-storage system monitoring module, can monitor SOC and the DC/DC reversible transducer of battery module in real time;
Bulk power grid contact module, knows the ruuning situation of bulk power grid and relevant schedule information for real-time from bulk power grid regulation and control center;
Frequency modulation and voltage modulation module, comprises FM module, voltage regulating module and Collaborative Control module;
Load monitoring module, for monitoring the load in energy-accumulating power station in real time;
Middle control module, for determining the operation reserve of micro-capacitance sensor, and sends instruction to each module in above-mentioned supervising device, to perform this operation reserve;
Bus module, for the liaison of the modules of this supervising device.
Preferably, FM module comprises Wind turbines power backup module, frequency modulation demand power judging section and frequency modulation power division module; Voltage regulating module comprises pressure regulation demand power judging section and pressure regulation power division module; Collaborative Control module comprises Wind turbines active power and reactive power exports reference value determination module, photovoltaic power generation equipment power stage reference value determination module and energy-storage system active power, reactive power exports reference value determination module.
Preferably, described FM module and voltage regulating module are respectively used to frequency and the voltage requirements of determining electric power system, judge that wind accumulation carries out active power and the reactive power numerical value of demand when electric power quality regulates, consider wind accumulation capacity limit and the restriction of Wind turbines excitation, according to actual condition, finally determine the active power of Wind turbines and energy storage device and the actual output of reactive power by Collaborative Control module.
Preferably, photovoltaic power generation equipment monitoring module at least comprises photovoltaic power generation equipment voltage, current detecting equipment, light intensity and temperature testing equipment.
Preferably, the service data of described photovoltaic power generation equipment monitoring module Real-time Obtaining photovoltaic power generation equipment, and store data.
Preferably, described wind power plant monitoring module at least comprises wind power plant voltage, electric current and frequency detection equipment, wind speed measurement equipment.
Preferably, the service data of described wind power plant monitoring module Real-time Obtaining wind power plant, and store data.
Preferably, energy-storage system monitoring module at least comprises accumulator voltage, electric current, SOC acquisition equipment and temperature testing equipment.
Preferably, described SOC obtains equipment and comprises: the first acquisition module, for obtaining the operating state of battery; First determination module, for determining the evaluation method of estimating battery state-of-charge according to the operating state of battery; Computing module, for being in the battery charge state value under different operating states according to evaluation method calculating battery.
Preferably, the first determination module comprises: first determines submodule, and for when the operating state got is inactive state, determine that evaluation method is the first evaluation method, wherein, the first evaluation method comprises open circuit voltage method; Second determines submodule, for when the operating state got is for returning to form, determines that evaluation method is the second evaluation method; 3rd determines submodule, and for when the operating state got is charging and discharging state, determine that evaluation method is the 3rd evaluation method, wherein, the 3rd evaluation method comprises Kalman filtering method.
Preferably, battery module adopts lithium battery as the base unit of power storage.
Preferably, described battery module, comprises n battery pack, described two-way DC/DC converter has n DC/DC current transformer, n is more than or equal to 3, and each battery pack is by the discharge and recharge of a DC/DC inverter controller, and this n DC/DC current transformer controls by energy-storage system monitoring module.
Micro-capacitance sensor tool of the present invention has the following advantages: the power output situation of change of (1) Accurate Prediction wind power plant and photovoltaic power generation equipment; (2) frequency change of automatic tracing bulk power grid and change in voltage, determines that bulk power grid participates in the demand of frequency modulation and voltage modulation to micro-grid system in real time; (3) control strategy is taken into account and is joined bulk power grid scheduling requirement and micro-grid system ruuning situation, can simultaneously for bulk power grid provides active power and reactive power, while the dispatching requirement meeting bulk power grid and micro-capacitance sensor internal load demand, the voltage that can effectively suppress micro-capacitance sensor to cause bulk power grid and the impact of frequency, take into account power supply reliability, ensure the fail safe of micro-capacitance sensor, extend the useful life of equipment in micro-capacitance sensor.
Accompanying drawing explanation
Fig. 1 shows and of the present inventionly a kind ofly automatically can realize the micro-grid system of FREQUENCY CONTROL and the block diagram of supervising device thereof;
Fig. 2 shows operation and the method for supervising of micro-grid system of the present invention.
Embodiment
Fig. 1 shows a kind of micro-capacitance sensor 10 with the energy-storage system can stabilizing power fluctuation of the present invention, and this micro-capacitance sensor 10 comprises: photovoltaic power generation equipment 12, energy-storage system 13, wind power plant 14, AC/DC two-way change of current module 1 for micro-capacitance sensor 10 and bulk power grid 20 are connected and are isolated, DC bus, the two-way change of current module 2 15 of AC/DC being used for connecting photovoltaic power generation equipment 12 and DC bus, load 17 and supervising device 11.
See Fig. 1, the two-way DC/DC converter 132 that this energy-storage system 13 comprises battery module 131, is connected with above-mentioned DC bus.
This supervising device 11 comprises: photovoltaic power generation equipment monitoring module 114, for the photovoltaic power generation equipment 12 in real-time monitoring battery energy-storage system 10, and predicts the generated output of photovoltaic power generation equipment 12; Energy-storage system monitoring module 115, for monitoring battery module 131 in energy-storage system 131 and DC/DC bidrectional transducer 132 in real time; Bulk power grid contact module 112, regulates and controls center from bulk power grid 20 know the ruuning situation of bulk power grid 20 and relevant schedule information for real-time; Frequency modulation and voltage modulation module 116, participating in the frequency and voltage adjustment of bulk power grid 20, comprising FM module, voltage regulating module and Collaborative Control module for controlling micro-grid system 10; Middle control module 117, for determining the operation reserve of micro-capacitance sensor 10, and sends instruction to above-mentioned each module, to perform this power supply strategy; Wind power plant monitoring module 113, for monitoring wind power plant 14 in real time; Load monitoring module 118, for the load 17 in real-time micro-capacitance sensor 10; Bus module 111, for the liaison of the modules of this supervising device 11.
Communication module 111, for the communication between above-mentioned modules, described bus communication module 111 is connected with other modules by redundancy dual CAN bus.
FM module comprises Wind turbines power backup module, frequency modulation demand power judging section and frequency modulation power division module; Voltage regulating module comprises pressure regulation demand power judging section and pressure regulation power division module; Collaborative Control module comprises Wind turbines active power and reactive power exports reference value determination module, photovoltaic power generation equipment power stage reference value determination module and energy-storage system active power, reactive power exports reference value determination module.
Described FM module and voltage regulating module are respectively used to frequency and the voltage requirements of determining electric power system, judge that wind accumulation carries out active power and the reactive power numerical value of demand when electric power quality regulates, consider wind accumulation capacity limit and the restriction of Wind turbines excitation, according to actual condition, finally determine the active power of Wind turbines and energy storage device and the actual output of reactive power by Collaborative Control module
Photovoltaic power generation equipment 12 comprises multiple photovoltaic generating module, and photovoltaic power generation equipment monitoring module 114 at least comprises voltage, electric current, frequency detection equipment, the light-intensity test equipment of photovoltaic power generation equipment.
The service data of described wind power plant monitoring module 113 Real-time Obtaining wind power plant 12, and store data.
Energy-storage system monitoring module 116 at least comprises accumulator voltage, electric current, SOC acquisition equipment and temperature testing equipment, can monitor the SOC of battery module in real time.
Described SOC obtains equipment and comprises: the first acquisition module, for obtaining the operating state of battery; First determination module, for determining the evaluation method of estimating battery state-of-charge according to the operating state of battery; Computing module, for being in the battery charge state value under different operating states according to evaluation method calculating battery.
First determination module comprises: first determines submodule, and for when the operating state got is inactive state, determine that evaluation method is the first evaluation method, wherein, the first evaluation method comprises open circuit voltage method; Second determines submodule, for when the operating state got is for returning to form, determines that evaluation method is the second evaluation method; 3rd determines submodule, and for when the operating state got is charging and discharging state, determine that evaluation method is the 3rd evaluation method, wherein, the 3rd evaluation method comprises Kalman filtering method.
Further, evaluation method is the 3rd evaluation method, and computing module comprises: set up module, for the battery model utilizing three rank equivalent electric circuits to set up battery; Second determination module, for determining the state equation of battery model and measuring equation; First calculating sub module, for using state equation and the battery charge state value measuring equation calculating battery.
Further, evaluation method is the second evaluation method, and computing module comprises: the second acquisition module, is entering the operating state before returning to form for obtaining battery; Second calculating sub module, at battery when entering the operating state before returning to form and being discharge condition, according to the first formulae discovery battery charge state value, wherein, the first formula is
sOC
tfor the battery charge state value under returning to form, SOC
dfor battery charge state value when discharge condition stops, M is the accumulation electricity in battery discharge procedure, t be battery in the time returning to form lower experience, h is the default duration returned to form, and Q is the actual capacity of battery; 3rd calculating sub module, at battery when entering the operating state before returning to form and being charged state, according to the second formulae discovery battery charge state value, wherein, the second formula is SOC
t=SOC
c+ M × h × 100%, SOC
cfor battery charge state value when charged state stops.
Further, evaluation method is the first evaluation method, and computing module comprises: the 3rd acquisition module, for obtaining the open circuit voltage of battery; Read module, for reading battery charge state value corresponding to open circuit voltage.
Preferably, battery module 131 adopts lithium battery as the base unit of power storage.
Preferably, described battery module 131, comprises n battery pack, described DC/DC reversible transducer 132 has n DC/DC current transformer, n is more than or equal to 3, and each battery pack is by the discharge and recharge of a DC/DC inverter controller, and this n DC/DC current transformer controls by energy-storage system monitoring module.
Middle control module 117 at least comprises CPU element, data storage cell and display unit.
Bulk power grid contact module 112 at least comprises Wireless Telecom Equipment.
Parallel control module 116 at least comprises checkout equipment, data acquisition unit and data processing unit for detecting bulk power grid 20 and micro-capacitance sensor 10 voltage, electric current and frequency.Data acquisition unit comprises collection preliminary treatment and A/D modular converter, gathers eight tunnel telemetered signal amounts, comprises grid side A phase voltage, electric current, the three-phase voltage of energy-accumulating power station side, electric current.Remote measurement amount changes strong ac signal (5A/110V) into inner weak electric signal without distortion by the high-precision current in terminal and voltage transformer, after filtering process, enter A/D chip carry out analog-to-digital conversion, digital signal after conversion calculates through data processing unit, obtains three-phase voltage current value and the bulk power grid 20 side phase voltage current value of wind energy turbine set energy-storage system 10 side.The process of this telemetered signal amount have employed high-speed and high-density synchronized sampling, automatic frequency tracking technology also has the fft algorithm improved, so precision is fully guaranteed, the measurement and process that gain merit in wind energy turbine set energy-storage system 10 side, idle and electric energy is from first-harmonic to higher harmonic components can be completed.
See accompanying drawing 2, method of the present invention comprises the steps:
S1. the service data of wind power plant and photovoltaic power generation equipment monitoring module Real-time Obtaining wind power plant and photovoltaic power generation equipment, and store data; According to the service data of wind power plant and photovoltaic power generation equipment, the power output of the wind power plant in following predetermined instant and photovoltaic power generation equipment is predicted;
S2. gather bulk power grid frequency, information of voltage, simultaneously according to the power output of the wind power plant in bulk power grid dispatch command and following predetermined instant and photovoltaic power generation equipment, form micro-grid system frequency modulation, pressure regulation spare capacity needs;
S3. the SOC obtaining battery module is detected in real time, Real-time Obtaining micro-capacitance sensor internal burden power demand conditions;
S4. according to the real-time frequency departure of bulk power grid and rate of change information thereof, the frequency modulation demand that bulk power grid is current is determined; The voltage deviation real-time according to bulk power grid and rate of change information thereof, determine the pressure regulation demand that bulk power grid is current;
S5. using the SOC of the frequency modulation demand of bulk power grid and pressure regulation demand, current batteries to store energy, current be electrical network internal burden power demand, following wind power plant and photovoltaic power generation equipment power output as constraints, realize the optimizing operation of micro-capacitance sensor.
Preferably, photovoltaic power generation equipment comprises photovoltaic module, in step sl described, predicts the power output of photovoltaic power generation equipment in the following way:
S21. the model of exerting oneself of photovoltaic module is set up: P
pv(t)=η
invη
pv(t) G (t) S
pv(1)
S in formula
pvfor photovoltaic panel receives the area (m of solar irradiation radiation
2), G (t) light radiation numerical value (W/m
2), η
pvt () is photovoltaic module energy conversion efficiency, η
invfor inverter conversion efficiency;
Wherein, the energy conversion efficiency of photovoltaic module is relevant with the temperature of environment, and ambient temperature on the impact of photovoltaic module energy conversion efficiency is:
η in formula
rfor the reference energy conversion efficiency of testing under photovoltaic module normal temperature, β is the influence coefficient of temperature to energy conversion efficiency, T
ct () is the temperature value of t photovoltaic module, T
crfor photovoltaic module normative reference temperature value; Photovoltaic module absorbs solar radiation, and can work with ambient temperature one and cause photovoltaic module temperature to change, its expression formula is as follows:
In formula, T is the ambient temperature of surrounding, T
ratthe rated temperature that photovoltaic module runs;
S22. detect in real time and the information and ambient temperature at sunshine of periphery of collection photovoltaics assembly, according to history information at sunshine and ambient temperature, the intensity of sunshine in prediction a period of time in future and ambient temperature;
S23. according to the intensity of sunshine in following a period of time and ambient temperature, the model of exerting oneself of above-mentioned photovoltaic module is utilized to calculate the generated output of the photovoltaic power generation equipment in future time.
Preferably, also have the following steps after S2, according to wind speed and wind energy turbine set frequency modulation, pressure regulation spare capacity needs, utilize the hypervelocity of Wind turbines to control and award setting, determine the initial active power of each typhoon group of motors, reactive power is exerted oneself and initial speed, initial propeller pitch angle.
Preferably, the determination of the initial speed of each typhoon group of motors is relevant with wind speed, according to Wind turbines active power fan-out capability and the stand-by requirement of electric power system frequency modulation, wind speed is divided into threshold wind velocity section, low wind speed section, middle wind speed section and high wind speed section 4 part.Wherein, threshold wind velocity section is for incision wind speed is to threshold wind speed, and threshold wind velocity section Wind turbines active power fan-out capability is less, and it is little that rotation speed change exports impact to Wind turbines active power; The wind speed of the low wind speed section upper limit for utilizing hypervelocity to control to provide the stand-by requirement of whole electric power system frequency modulation; When high wind speed section lower limit is for employing MPPT maximum power point tracking, Wind turbines rotating speed reaches wind speed during maximum (top) speed; Corresponding different wind speed, the initial speed of Wind turbines is different, and initial speed ω and wind speed relation meet:
In formula (4), R
wfor Wind turbines radius, λ is the tip speed ratio that Wind turbines obtains when controlling according to MPPT maximum power point tracking, λ ' for Wind turbines according to the active power of reserved d% as the tip speed ratio obtained during frequency modulation spare capacity needs, v
wind speedfor the Wind turbines wind speed detected, v
threshold wind speedfor the maximum wind velocity of threshold wind velocity section, v
mid.infor the minimum windspeed of middle wind speed section.
Preferably, according to wind speed and wind energy turbine set frequency modulation, pressure regulation spare capacity needs, utilize the hypervelocity of Wind turbines to control and award setting, determine the initial active power of each typhoon group of motors, reactive power is exerted oneself, initial speed, initial propeller pitch angle, and the state-of-charge of energy storage device; Wherein the frequency modulation spare capacity needs of wind energy turbine set is exerted oneself with the initial active power of each typhoon group of motors, initial speed, initial propeller pitch angle and energy storage device state-of-charge be relevant, and the pressure regulation spare capacity needs of wind energy turbine set is exerted oneself relevant with the initial reactive power of each typhoon group of motors.
Wind energy turbine set frequency modulation spare capacity needs is controlled jointly to provide with award setting by the hypervelocity of each typhoon group of motors.After how many wind energy turbine set frequency modulation spare capacity needs is born in the hypervelocity control and award setting of determining Wind turbines respectively, can obtain corresponding to the initial speed of this wind energy turbine set frequency modulation spare capacity needs and initial propeller pitch angle, and send initial active power by initial speed and initial award setting Wind turbines.When wind speed is in threshold wind velocity section, Wind turbines adopts MPPT maximum power point tracking to control, and ignores wind energy turbine set frequency modulation spare capacity needs; When low wind speed section, the wind energy turbine set frequency modulation non-firm power that power system dispatching requires Wind turbines to reserve all is controlled to provide by the hypervelocity of Wind turbines; In middle wind speed section, frequency modulation non-firm power is preferentially controlled to provide by the hypervelocity of Wind turbines, and insufficient section utilizes the award setting of Wind turbines to provide; In high wind speed section, Wind turbines adopts constant speed control, and frequency modulation non-firm power provides by the award setting of Wind turbines.
In step s 4 which, the frequency departure of bulk power grid is divided into F1-F4 tetra-kinds of situations, is respectively:
F1:f≥50.5Hz，F2:50Hz≤f＜50.5Hz，F3:48.5Hz≤f＜50Hz，F4:f＜48.5Hz
In formula, variable f refers to the electric power system real-time frequency detected;
The voltage deviation of bulk power grid is divided into U1-U4 tetra-kinds of situations, is respectively:
U1:U≥1.3U
ref，U2:1.0U
ref≤U＜1.3U
ref,U3:0.8U
ref≤U＜1.0U
ref,U4:U＜0.8U
ref
In formula, variable U
refrefer to bulk power grid rated voltage, U refers to the bulk power grid real-time voltage detected.
Preferably, optimizing operation is realized in the following way in step s 5:
S51. to exert oneself predicted conditions and photovoltaic power generation equipment process predicted conditions according to Wind turbines, determine the active power that Wind turbines, photovoltaic power generation equipment and energy-storage system need to send and reactive power size;
S52. in conjunction with Wind turbines capacity, exciting current restriction and the real-time electric state of bulk power grid, determine that Wind turbines active power and reactive power are exerted oneself reference value;
S53. limit and the real-time electric state of bulk power grid in conjunction with energy-storage system SOC, determine that the active power of energy-storage system and reactive power are exerted oneself reference value;
S54. reference value of Wind turbines active power and reactive power being exerted oneself is converted to the parameters input such as Wind turbines rotating speed, propeller pitch angle, exciting current to Wind turbines, makes the adjustment that Wind turbines participates in power system frequency and voltage;
S55. reference value of the active power of photovoltaic power generation equipment and energy-storage system and reactive power being exerted oneself inputs to photovoltaic power generation equipment and energy-storage system, makes the adjustment that photovoltaic power generation equipment and energy storage device participate in power system frequency and voltage.
According to frequency departure and the voltage deviation of described bulk power grid, the real-time electric state of bulk power grid is divided into following 16 kinds:
F4∩U3＝T1 F3∩U3＝T5 F4∩U4＝T9 F3∩U1＝T13
F4∩U2＝T2 F3∩U2＝T6 F4∩U1＝T10 F3∩U4＝T14
F1∩U3＝T3 F2∩U3＝T7 F1∩U4＝T11 F2∩U1＝T15
F1∩U2＝T4 F2∩U2＝T8 F1∩U1＝T12 F2∩U4＝T16
To the real-time electric state of above-mentioned various bulk power grid, determined active power and method for controlling reactive power as follows:
For electric state T1-T4, micro-grid system is preferentially utilized to carry out electric power system active power regulation; For electric state T5-T12, meeting in micro-grid system capacity limit situation, according to the demand of electric power system to active power and reactive power, completing electric power system active power in proportion and reactive power regulates; For electric state T13-T16, micro-grid system is preferentially utilized to carry out Power System Reactive Power adjustment.
For the distribution of micro-grid system active power, preferentially utilize the active reserve capacity of Wind turbines and photovoltaic power generation equipment self, when the active reserve capacity of Wind turbines and photovoltaic power generation equipment self is not enough, recycling energy-storage system makes up the deficiency that active power is exerted oneself; For the distribution of micro-grid system reactive power, preferentially utilize the reactive power reserve of Wind turbines self, when the reactive power reserve of Wind turbines self is not enough, recycling energy-storage system makes up the deficiency that reactive power is exerted oneself.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, make some equivalent to substitute or obvious modification, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (12)
1. automatically can realize a micro-grid system for FREQUENCY CONTROL, this micro-capacitance sensor comprises: wind power plant, photovoltaic power generation equipment, energy-storage system, AC/DC two-way change of current module one, DC bus, the two-way change of current module two of AC/DC being used for connecting wind power plant, photovoltaic power generation equipment and DC bus, micro-capacitance sensor internal burden and supervising device for being connected with bulk power grid by micro-capacitance sensor and isolating;
The two-way DC/DC converter that this energy-storage system comprises battery module, is connected with above-mentioned DC bus;
This supervising device comprises:
Wind power generation generating equipment monitoring module, for monitoring wind power plant in real time, and predicts the generated output of wind power plant;
Photovoltaic power generation equipment monitoring module, for monitoring photovoltaic power generation equipment in real time, and predicts the generated output of photovoltaic power generation equipment;
Energy-storage system monitoring module, can monitor SOC and the DC/DC reversible transducer of battery module in real time;
Bulk power grid contact module, knows the ruuning situation of bulk power grid and relevant schedule information for real-time from bulk power grid regulation and control center;
Frequency modulation and voltage modulation module, comprises FM module, voltage regulating module and Collaborative Control module;
Load monitoring module, for monitoring the load in energy-accumulating power station in real time;
Middle control module, for determining the operation reserve of micro-capacitance sensor, and sends instruction to each module in above-mentioned supervising device, to perform this operation reserve;
Bus module, for the liaison of the modules of this supervising device.
2. micro-grid system as claimed in claim 1, it is characterized in that, described FM module comprises Wind turbines power backup module, frequency modulation demand power judging section and frequency modulation power division module; Voltage regulating module comprises pressure regulation demand power judging section and pressure regulation power division module; Collaborative Control module comprises Wind turbines active power and reactive power exports reference value determination module, photovoltaic power generation equipment power stage reference value determination module and energy-storage system active power, reactive power exports reference value determination module.
3. micro-grid system as claimed in claim 2, it is characterized in that, described FM module and voltage regulating module are respectively used to frequency and the voltage requirements of determining electric power system, judge that wind accumulation carries out active power and the reactive power numerical value of demand when electric power quality regulates, consider wind accumulation capacity limit and the restriction of Wind turbines excitation, according to actual condition, finally determine the active power of Wind turbines and energy storage device and the actual output of reactive power by Collaborative Control module.
4. the micro-grid system as described in as arbitrary in claim 1-3, it is characterized in that, photovoltaic power generation equipment monitoring module at least comprises photovoltaic power generation equipment voltage, current detecting equipment, light intensity and temperature testing equipment.
5. the micro-grid system as described in as arbitrary in claim 4, is characterized in that, the service data of described photovoltaic power generation equipment monitoring module Real-time Obtaining photovoltaic power generation equipment, and stores data.
6. the micro-grid system as described in as arbitrary in claim 5, it is characterized in that, described wind power plant monitoring module at least comprises wind power plant voltage, electric current and frequency detection equipment, wind speed measurement equipment.
7. the micro-grid system as described in as arbitrary in claim 6, is characterized in that, the service data of described wind power plant monitoring module Real-time Obtaining wind power plant, and stores data.
8. the micro-grid system as described in as arbitrary in claim 7, is characterized in that, energy-storage system monitoring module at least comprises accumulator voltage, electric current, SOC obtain equipment and temperature testing equipment.
9. the micro-grid system as described in as arbitrary in claim 9, is characterized in that, described SOC obtains equipment and comprises: the first acquisition module, for obtaining the operating state of battery; First determination module, for determining the evaluation method of estimating battery state-of-charge according to the operating state of battery; Computing module, for being in the battery charge state value under different operating states according to evaluation method calculating battery.
10. the micro-grid system as described in as arbitrary in claim 9, it is characterized in that, first determination module comprises: first determines submodule, for when the operating state got is inactive state, determine that evaluation method is the first evaluation method, wherein, the first evaluation method comprises open circuit voltage method; Second determines submodule, for when the operating state got is for returning to form, determines that evaluation method is the second evaluation method; 3rd determines submodule, and for when the operating state got is charging and discharging state, determine that evaluation method is the 3rd evaluation method, wherein, the 3rd evaluation method comprises Kalman filtering method.
11. as arbitrary in claim 10 as described in micro-grid system, it is characterized in that, battery module adopts lithium battery as the base unit of power storage.
12. as arbitrary in claim 11 as described in micro-grid system, it is characterized in that, described battery module, comprise n battery pack, described two-way DC/DC converter has n DC/DC current transformer, n is more than or equal to 3, and each battery pack is by the discharge and recharge of a DC/DC inverter controller, and this n DC/DC current transformer controls by energy-storage system monitoring module.
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