CN104218568A - Power grid black-start method with participation of regional small hydropower stations and new energy hybrid micro-grids - Google Patents
Power grid black-start method with participation of regional small hydropower stations and new energy hybrid micro-grids Download PDFInfo
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Abstract
The invention discloses a power grid black-start method with participation of regional small hydropower stations and new energy hybrid micro-grids. A process of the method includes selecting black-start micro-grids; selecting the optimal starting paths; starting the micro-grids; charging lines; transmitting power to loads; outwardly expanding and starting started power sources; interconnecting the micro-grids with systems. Energy storage systems in the micro-grids are used as black-start power sources when the micro-grids are started and run in V-F modes, so that voltages can be assuredly generated for buses of the micro-grids; present voltage frequency stability of the micro-grids can be guaranteed by means of invoking active power and reactive power which are outputted by the energy storage systems when the small hydropower stations and photovoltaic systems in the micro-grids are started. The power grid black-start method has the advantages that merits of simple auxiliary equipment, low auxiliary power consumption, high starting speeds and the like of the micro-grids are sufficiently utilized by the power grid black-start method, the micro-grids are used as the black-start power sources for power grids, accordingly, power failure durations of the power grids can be shortened, and normal running of the power grids can be restored as soon as possible; the power grid black-start method is applicable to black-start of the regional small hydropower stations and the new energy hybrid micro-grids.
Description
Technical field
The present invention relates to a kind of complementary micro-capacitance sensor and participate in power grid"black-start" method, belong to micro-capacitance sensor applied technical field.
Background technology
Power grid"black-start" refers to that electric power system fault is stopped transport or after disintegrating, by possessing the unit of self-startup ability or the outside electric power inputted in system, the unit of non self starting in start up system, progressively makes the process that System recover normally runs.Black-start scheme is exactly the electric power of how this part self-starting of Appropriate application, makes rapidly power system restoration normal.
Micro-capacitance sensor refers to the compact electrical generating systems collected by distributed power source, energy storage device, energy conversion device, associated loadings and monitoring, protective device.Power supply in micro-capacitance sensor mostly is the less distributed power source of capacity, comprises the energy storage devices such as miniature gas turbine, fuel cell, photovoltaic cell, small-sized wind power generator group and super capacitor, flywheel and storage battery.They are connected on user side, have that cost is low, voltage is low and pollute the features such as little.
The diversity of power supply, uncertainty significantly increase interconnected power grid and run the difficulty controlled.On July 30th, 2012, India from two o'clock in the morning in July 30 local time partly, the biduous time, there occurs the large-scale blackout close to India's half area comprising New Delhi, capital, relate to population more than 10.7 hundred million, direct economic loss multi-million dollar.Following electrical network is as relation all trades and professions, the bulky systems extending to huge numbers of families, and the tie society people's livelihood, power grid enterprises will put safety in production in the first place all the time.Occurrence of large-area power outage has been not only economic problems, and entail dangers to is national and social public security.Therefore, new forms of energy micro-capacitance sensor is as black starting-up power supply or start normal power supplies subsidiary engine, realizes the recovery control under grid fault conditions or black starting-up, is extremely important to the safe and economical operation of electrical network.
Carry out the complementary micro-capacitance sensor of region small power station and multiple distributed new to control and application study in black starting-up at power system restoration, in extreme circumstances, make full use of that this micro-capacitance sensor auxiliary equipment is simple, station service is few, the advantages such as toggle speed is fast, it can be used as the power supply of power grid"black-start", reduce the grid power blackout time, recover the normal operation of electrical network as early as possible.
Summary of the invention
The object of the invention is, under electrical network extreme case, performance region small hydropower system and the complementary micro-capacitance sensor of new forms of energy are to the supporting role of regional power grid, and the present invention proposes a kind of region small hydropower system and the complementary micro-capacitance sensor of new forms of energy participates in power grid"black-start" method.
Technical scheme of the present invention is, the flow process that small hydropower system new forms of energy complementary microgrid in region of the present invention participates in power grid"black-start" is followed successively by: selected black starting-up microgrid, selectedly optimumly start path, micro-capacitance sensor starts, to line charging, to load power transmission, outwards expand startup and be activated power supply, arranged side by side with system.
Energy-storage system in micro-capacitance sensor is black starting-up power supply, and energy-storage system, with V-F mode operation, ensures that micro-capacitance sensor bus sets up voltage.In micro-capacitance sensor the system such as small power station, photovoltaic start by, the active power exported by adjusting energy-storage system and reactive power, ensure that the current electric voltage frequency of micro-capacitance sensor is stablized.
In micro-capacitance sensor build down process, first start small power station's unit in micro-capacitance sensor, if small power station's unit starting success, energy-storage system transfers droop control mode operation to, and energy-storage system follows voltage and the frequency of small power station's unit foundation.If small power station's unit starting failure, energy-storage system continues the voltage, the frequency stabilization that maintain V-F micro-capacitance sensor.Then, controlled inverse type power initiation in micro-capacitance sensor is carried out.Finally, the service restoration of important load in micro-capacitance sensor is carried out.
Micro-capacitance sensor sky fills in long transmission line process, by regulating the operational mode of energy accumulation current converter in micro-capacitance sensor for absorbing idle mode, reaching and controlling charging process overvoltage object.According to energy storage system capacity, calculate the line length that can charge, ensure overvoltage to occur in black starting-up line charging process.
The flow process that region of the present invention small hydropower system and the complementary micro-capacitance sensor of new forms of energy participate in power grid"black-start" is as follows:
(1) determine complementary micro-capacitance sensor black starting-up power supply and start path, micro-capacitance sensor black starting-up power supply can start from net when output end voltage is zero, independently sets up stable micro-grid system ac bus voltage.Small hydropower system new forms of energy complementary micro-capacitance sensor in region can select energy-storage system as black starting-up power supply.
(2) under the effect of micro-capacitance sensor controller, start micro-capacitance sensor black starting-up power supply, ensure that micro-capacitance sensor bus sets up voltage.With V-F mode operation after energy-storage system starts, by controlling micro-capacitance sensor active power and reactive power equilibrium, ensure that the current electric voltage frequency of micro-capacitance sensor is stablized.
(3) in the charged situation of micro-capacitance sensor bus, start other power supplys in micro-capacitance sensor, recover important load and power, build down mode completes micro-capacitance sensor and starts.
(4) start small power station's unit in micro-capacitance sensor, in small power station's unit starting process, energy-storage system regulates micro-capacitance sensor voltage, frequency.After small power station's unit starting success, energy-storage system transfers droop control mode operation to, and energy-storage system follows voltage and the frequency of small power station's unit foundation.Micro-capacitance sensor obtains stable frequency and voltage by the P/F droop control of energy storage and Q/V droop control, without the need to the communication-cooperation between power supply, achieves the target that micro-source plug and play and equity control.
(5) if small power station's unit starting failure, energy-storage system continues to maintain V-F and runs, and ensures voltage, the frequency stabilization of micro-capacitance sensor.
(6) start controlled inverse type power supply distribution photovoltaic system in micro-capacitance sensor, photovoltaic system operates in P-Q pattern, by the power output of setting active power definite value, reactive power Set-value adjustment photovoltaic system.
(7) drop into important load in micro-capacitance sensor, ensure that important load is powered.
(8) closed micro-grid connection point switch, micro-capacitance sensor is powered to being activated power station internal loading, and first charging zero load or underloading long transmission line, because distributed capacitance exists, produce idle in a large number, cause system voltage to raise.Utilize voltage and idle control planning, regulating the operational mode of energy accumulation current converter in micro-capacitance sensor for absorbing idle mode, reaching and controlling charging process overvoltage object.
(9), by energy storage system capacity, when calculating micro-capacitance sensor is powered for being activated power supply subsidiary engine, the line length that can charge, ensures overvoltage to occur in black starting-up line charging process.
(10) after completing line charging, micro-capacitance sensor band is activated power supply station-service load, starts and is activated power supply.Energy storage in cooperation control micro-capacitance sensor, small power station, photovoltaic system, ensure that micro-capacitance sensor is exerted oneself and the power-balance of load.
The invention has the beneficial effects as follows, a kind of region small power station that the present invention proposes and the complementary micro-capacitance sensor of new forms of energy participate in power grid"black-start" method, be black starting-up power supply by the energy-storage system in micro-capacitance sensor, with V-F mode operation after energy-storage system starts, by controlling micro-capacitance sensor active power and reactive power equilibrium, ensure that the current electric voltage frequency of micro-capacitance sensor is stablized.The inventive method makes full use of the advantages such as micro-capacitance sensor auxiliary equipment is simple, station service is few, and toggle speed is fast, it can be used as the power supply of power grid"black-start", reduces the grid power blackout time, recovers the normal operation of electrical network as early as possible.
The present invention is applicable to the black starting-up of region small power station and the complementary micro-capacitance sensor of new forms of energy.
Accompanying drawing explanation
Fig. 1 is the complementary micro-capacitance sensor structure charts of region small hydropower system new forms of energy;
Fig. 2 is that complementary micro-capacitance sensor participates in power grid"black-start" flow chart;
Fig. 3 is black starting-up line map.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Small hydropower system new forms of energy complementary micro-capacitance sensor structure chart in region as shown in Figure 1, is made up of energy storage, small power station, photovoltaic, wind-powered electricity generation, net internal loading etc.The flow process that small hydropower system new forms of energy complementary micro-capacitance sensor in region participates in power grid"black-start" comprises:
Selected black starting-up micro-capacitance sensor → selected is optimum to be started path → micro-capacitance sensor and starts → to line charging → be activated power supply → arranged side by side with system to load power transmission → outwards expand startup.
Micro-capacitance sensor start-up course as shown in Figure 2, when output end voltage is zero, can independently can set up the energy-storage system of stable ac bus voltage as micro-capacitance sensor black starting-up power supply in the micro-capacitance sensor of selection area.Energy-storage system, with V-F mode operation, ensures that micro-capacitance sensor bus sets up voltage.In micro-capacitance sensor the system such as small power station, photovoltaic start by, the active power exported by adjusting energy-storage system and reactive power, ensure that the current electric voltage frequency of micro-capacitance sensor is stablized.
After in micro-capacitance sensor, energy-storage system starts, serial mode carries out the recovery of micro-capacitance sensor.First, start small power station's unit in micro-capacitance sensor, in small power station's unit starting process, energy-storage system regulates micro-capacitance sensor voltage, frequency.If small power station's unit starting success, energy-storage system transfers droop control mode operation to, and energy-storage system follows voltage and the frequency of small power station's unit foundation.Micro-capacitance sensor obtains stable frequency and voltage by the P/F droop control of energy storage and Q/V droop control.If small power station's unit starting failure, energy-storage system continues the voltage, the frequency stabilization that maintain V-F micro-capacitance sensor.Then, carry out controlled inverse type power initiation in micro-capacitance sensor, as photovoltaic system, after starting, photovoltaic system operates in P-Q pattern, by the power output of setting active power definite value, reactive power Set-value adjustment photovoltaic system.Finally, the service restoration of important load in micro-capacitance sensor is carried out.
After micro-capacitance sensor starts, closed micro-grid connection point switch, micro-capacitance sensor charging zero load or underloading long transmission line, because distributed capacitance exists, produce idle in a large number, cause system voltage to raise.Utilize voltage and idle control planning, regulating the operational mode of energy accumulation current converter in micro-capacitance sensor for absorbing idle mode, reaching and controlling charging process overvoltage object.
If line parameter circuit value is uniformly distributed along the line. ignore line resistance and conductance. for long distance transmission line. generally need to consider its characteristics of distributed parameters.If the black starting-up initial stage is respectively U to circuit top voltage, electric current after line charging
1, I
1, terminal voltage, electric current are respectively U
2, I
2, micro-capacitance sensor terminal voltage is U
0, electric current is I
0, line length is l, as shown in Figure 3.Following relational expression is had between the voltage of circuit first and end, electric current
Wherein
l
0, C
0be respectively unit length inductance, the electric capacity of circuit; ω is system angle frequency; L is line length.Because nonloaded line end is open-circuit condition, so.
Micro-capacitance sensor terminal voltage is U
0, electric current is I
0, as follows with circuit top voltage, current relationship:
K is transformer voltage ratio, X
tfor this calculates to the transformer leakage reactance of main transformer base pressure side, as calculated, micro-capacitance sensor sky fills the apparent power provided in long transmission line process and is
There is provided apparent power by energy-storage system in black starting-up process, S is the rated capacity of energy-storage system, can calculate thus and ensure the maximum chargeable line length in black starting-up process in voltage stabilization situation.
After completing line charging, micro-capacitance sensor is powered for being activated power supply station-service load, and maintains power supply, frequency stabilization, ensures the normal startup being activated power supply, the progressively startup of feasible region electrical network.
Claims (4)
1. a region small power station and the complementary micro-capacitance sensor of new forms of energy participate in power grid"black-start" method, it is characterized in that, the flow process of described method is followed successively by: selected black starting-up microgrid, selectedly optimumly start path, micro-capacitance sensor starts, to line charging, to load power transmission, outwards expand startup and be activated power supply, arranged side by side with system.
2. a kind of region small power station according to claim 1 and the complementary micro-capacitance sensor of new forms of energy participate in power grid"black-start" method, it is characterized in that, during described micro-capacitance sensor starts, in micro-capacitance sensor, energy-storage system is black starting-up power supply, energy-storage system, with V-F mode operation, ensures that micro-capacitance sensor bus sets up voltage; During in micro-capacitance sensor, small power station, photovoltaic system start, the active power exported by adjusting energy-storage system and reactive power, ensure that the current electric voltage frequency of micro-capacitance sensor is stablized.
3. a kind of region small power station according to claim 1 and the complementary micro-capacitance sensor of new forms of energy participate in power grid"black-start" method, it is characterized in that, described micro-capacitance sensor starts employing build down mode, in micro-capacitance sensor build down process, first small power station's unit in micro-capacitance sensor is started, if small power station's unit starting success, energy-storage system transfers droop control mode operation to, and energy-storage system follows voltage and the frequency of small power station's unit foundation; If small power station's unit starting failure, energy-storage system continues the voltage, the frequency stabilization that maintain V-F micro-capacitance sensor; Then, controlled inverse type power initiation in micro-capacitance sensor is carried out; Finally, the service restoration of important load in micro-capacitance sensor is carried out.
4. a kind of region small power station according to claim 1 and the complementary micro-capacitance sensor of new forms of energy participate in power grid"black-start" method, it is characterized in that, describedly refer to the unloaded or underloading long transmission line of charging to line charging, micro-capacitance sensor sky fills in long transmission line process, by regulating the operational mode of energy accumulation current converter in micro-capacitance sensor for absorbing idle mode, reaching and controlling charging process overvoltage object; According to energy storage system capacity, calculate the line length that can charge, ensure overvoltage to occur in black starting-up line charging process.
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Cited By (12)
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| CN105186569A (en) * | 2015-10-19 | 2015-12-23 | 东南大学 | Recovery path selection method when wind power plant participating power grid black-start |
| CN106992537A (en) * | 2017-03-29 | 2017-07-28 | 中国电力科学研究院 | A kind of power grid"black-start" method and device |
| CN106026177B (en) * | 2016-07-14 | 2018-10-12 | 国网江苏省电力公司电力科学研究院 | The power grid"black-start" method of electricity generation system is stored up based on light |
| CN108808654A (en) * | 2018-05-04 | 2018-11-13 | 东南大学 | A kind of new energy participates in the dynamic model verification method of power grid"black-start" |
| CN109004678A (en) * | 2018-08-30 | 2018-12-14 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of multipotency combined power plant black starting-up distribution system and control method |
| CN109217348A (en) * | 2017-06-29 | 2019-01-15 | 周锡卫 | A kind of the black starting-up device and control method of scene power supply micro-capacitance sensor |
| CN109617050A (en) * | 2018-12-04 | 2019-04-12 | 浙江浙能嘉华发电有限公司 | A kind of Service Power in Thermal Power Plant micro-grid system simulation model |
| CN109742809A (en) * | 2019-03-15 | 2019-05-10 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of multi-source complementation accumulation energy type power plant emergency power supply system and its control method |
| CN113991644A (en) * | 2021-10-12 | 2022-01-28 | 广西电网有限责任公司电力科学研究院 | Gas turbine black start improvement method considering energy storage auxiliary system |
| CN114050580A (en) * | 2021-11-10 | 2022-02-15 | 许继集团有限公司 | Voltage regulation method and device for regional-level hundred-percent new energy power system |
| CN114142455A (en) * | 2021-09-30 | 2022-03-04 | 国网湖北省电力有限公司电力科学研究院 | Method for black start by using external power supply through extra-high voltage alternating current power station |
| CN113991644B (en) * | 2021-10-12 | 2024-06-28 | 广西电网有限责任公司电力科学研究院 | Gas turbine black start improvement method considering energy storage auxiliary system |
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| CN105186569A (en) * | 2015-10-19 | 2015-12-23 | 东南大学 | Recovery path selection method when wind power plant participating power grid black-start |
| CN106026177B (en) * | 2016-07-14 | 2018-10-12 | 国网江苏省电力公司电力科学研究院 | The power grid"black-start" method of electricity generation system is stored up based on light |
| CN106992537B (en) * | 2017-03-29 | 2019-10-15 | 中国电力科学研究院 | A kind of power grid"black-start" method and device |
| CN106992537A (en) * | 2017-03-29 | 2017-07-28 | 中国电力科学研究院 | A kind of power grid"black-start" method and device |
| CN109217348A (en) * | 2017-06-29 | 2019-01-15 | 周锡卫 | A kind of the black starting-up device and control method of scene power supply micro-capacitance sensor |
| CN109217348B (en) * | 2017-06-29 | 2024-03-08 | 周锡卫 | Control method of black start device of wind-light power supply micro-grid |
| CN108808654A (en) * | 2018-05-04 | 2018-11-13 | 东南大学 | A kind of new energy participates in the dynamic model verification method of power grid"black-start" |
| CN109004678A (en) * | 2018-08-30 | 2018-12-14 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of multipotency combined power plant black starting-up distribution system and control method |
| CN109004678B (en) * | 2018-08-30 | 2024-05-03 | 中国电力工程顾问集团西北电力设计院有限公司 | Black-start power distribution system of multi-energy combined power plant and control method |
| CN109617050A (en) * | 2018-12-04 | 2019-04-12 | 浙江浙能嘉华发电有限公司 | A kind of Service Power in Thermal Power Plant micro-grid system simulation model |
| CN109742809A (en) * | 2019-03-15 | 2019-05-10 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of multi-source complementation accumulation energy type power plant emergency power supply system and its control method |
| CN109742809B (en) * | 2019-03-15 | 2023-12-26 | 中国电力工程顾问集团西北电力设计院有限公司 | Multi-source complementary energy storage type power station security power supply system and control method thereof |
| CN114142455A (en) * | 2021-09-30 | 2022-03-04 | 国网湖北省电力有限公司电力科学研究院 | Method for black start by using external power supply through extra-high voltage alternating current power station |
| CN114142455B (en) * | 2021-09-30 | 2023-09-26 | 国网湖北省电力有限公司电力科学研究院 | Method for black start by using extra-high voltage alternating current power station and external power supply |
| CN113991644A (en) * | 2021-10-12 | 2022-01-28 | 广西电网有限责任公司电力科学研究院 | Gas turbine black start improvement method considering energy storage auxiliary system |
| CN113991644B (en) * | 2021-10-12 | 2024-06-28 | 广西电网有限责任公司电力科学研究院 | Gas turbine black start improvement method considering energy storage auxiliary system |
| CN114050580A (en) * | 2021-11-10 | 2022-02-15 | 许继集团有限公司 | Voltage regulation method and device for regional-level hundred-percent new energy power system |
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Application publication date: 20141217 |