CN103633642B - Hydropower-dominated island power grid frequency stability planning and analysis method - Google Patents
Hydropower-dominated island power grid frequency stability planning and analysis method Download PDFInfo
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- CN103633642B CN103633642B CN201310548771.XA CN201310548771A CN103633642B CN 103633642 B CN103633642 B CN 103633642B CN 201310548771 A CN201310548771 A CN 201310548771A CN 103633642 B CN103633642 B CN 103633642B
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- 238000004458 analytical method Methods 0.000 title abstract description 8
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- 230000006641 stabilisation Effects 0.000 claims description 18
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Abstract
The invention discloses a method for planning and analyzing the frequency stability of a hydropower-dominated island power grid. The problem of frequency stability in a system is caused by power excess or power deficiency caused by faults and other reasons of a hydropower-dominated island power grid, and how to analyze the problem in planning comprises the following steps: 1) closing the speed regulators of the thermal power generating unit and the small hydroelectric generating unit without considering the primary frequency modulation effect; 2) starting a direct current frequency limiting function to control the frequency; 3) starting a large hydroelectric speed regulator in an island power grid to control the frequency; 4) and the load frequency characteristic adjusting function is used for controlling the frequency. The invention provides a planning analysis method aiming at the problem of frequency stability of a hydropower dominated island system, which can adapt to analysis and calculation of the frequency stability of a large-scale hydropower dominated island power grid and improve the reliability and the inclusion of a simulation analysis result.
Description
Technical field
The present invention relates to a kind of island-grid frequency stabilization planning application method that water power is leading, belong to the technical field that power system safety and stability is analyzed.
Background technology
Yunnan hydropower aboundresources, 2015, the year two thousand twenty and the year two thousand thirty Yunnan hydropower installation by reaching 6,486 ten thousand kilowatts, 7,896 ten thousand kilowatts and 11,461 ten thousand kilowatts respectively, account for about 75% of the whole province's total installed capacity of electricity.Send base outside as the large-scale water power of south electric network, 2015, the year two thousand twenty and distant view water power thereof send scale and be reached for 1,910 ten thousand kilowatts and 3,310 ten thousand ten million respectively, sending direct current scale outside is 4 times and 8 times.Influencing each other for reducing Yunnan Power System alternating current-direct current, Yunnan Power System being exchanged to get in touch with south electric network major network disconnect, realize Yunnan Power System isolated power grid.
Concentrate the island-grid sent as water power, the safety and stability problem that Yunnan Power System faces is changed into the frequency stabilization problem under decoupled mode by the angle stability problem under networking mode.How to seek a kind of analytical method studying the island-grid frequency stabilization problem that water power is dominated in the planning stage, the feature that island-grid system frequency that water power is dominated is stable can be reflected, the multiple uncertain factor that future plan power network development affects frequency stabilization can be contained, improve reliability and the pardon of simulation result, finally could propose effective counter-measure.
Summary of the invention
The object of the invention is to propose a kind of leading island-grid frequency stabilization planning application method of water power.The present invention is directed to the system cloud gray model feature of the island-grid that water power is dominated, propose a kind of frequency stabilization analytical method controlled based on thermoelectricity/water power speed regulator, direct current frequency limitation function FLC and frequency character of load, ensure in the reliability of planning stage analysis result and too conservative property.
Frequency stabilization planning application method of the present invention, comprises the steps:
1) for the island-grid that water power is leading, the fired power generating unit first in closedown islanded system and the speed regulator of small power station's unit, do not consider its fm role;
2) start direct current frequency limitation function in island-grid, islanded system frequency is regulated;
3) the medium-and-large-sized water power speed regulator of island-grid starts, and the change according to mains frequency automatically increases or reduces the power of the assembling unit, make the balance that power reaches new, and sustain pulse frequency is in certain limit, realizes generator primary frequency modulation;
4) play the regulating action of frequency character of load, frequency is controlled;
Above-mentioned steps 4) in, consider in simulation calculation that load changes with system frequency, assumed load frequency factor reacts the load variations caused by frequency change,
represent the meritorious percent change that frequency change 1% causes,
represent the idle percent change that frequency change 1% causes,
with
value determine according to system load characteristic, system frequency change
the burden with power variable quantity caused is
, load or burden without work variable quantity
.
Above-mentioned steps 1) in, wide for distribution, quantity is many and belong to the small hydropower station of local scheduling, its definite installation scale cannot be added up on the one hand, future plan construction scale also cannot be clear and definite, small power station's speed regulator Equipments Setting imperfection on the other hand, in the reliability that the planning application stage is raising frequency stabilization simulation result, adopt too conservative emulation mode: close the speed regulator that single-machine capacity is 50MW and following Hydropower Unit; Leading island-grid is accounted for for water power, the wet season net in thermoelectricity start account for the whole network start ratio lower, the planning application stage adopt guard emulation mode: the speed regulator of closing all fired power generating unit.
Above-mentioned steps 2) in, the reaction speed of direct current frequency limiter is fast, gives full play to the effect of direct current frequency limiter in island-grid, when island-grid frequency change, first sends power outside to reach the object controlling sending frequency by rapid adjustment.
Above-mentioned steps 3) in, due to the amplitude of accommodation of hydro turbine governor and the frequency modulation performance of governing speed more excellent than fired power generating unit; Leading island-grid is accounted for for water power, the frequency modulation regulatory function of medium-and-large-sized water power speed regulator is stablized most important to maintenance mains frequency, dead band and the direct current frequency limiter dead band of its speed regulator cooperatively interact, and start after after direct current frequency limiter starts, system frequency exceedes its dead band.
The system cloud gray model feature of the island-grid that the present invention dominates according to water power, the impact of its frequency stabilization problem to system Tapes is analyzed in the planning stage, for ensureing that the reliability of result is from the several aspects affecting water power islanded system frequency stabilization, propose a kind of effective frequency stabilization analytical method newly, improve reliability and the pardon of analog simulation result.
Accompanying drawing explanation
Fig. 1 is the realization flow figure of the inventive method.
Embodiment
With reference to accompanying drawing 1, this method is described in detail:
1) speed regulator that fired power generating unit in islanded system and single-machine capacity are 50MW and following Hydropower Unit is first closed.
2) start direct current frequency limitation function (FLC control) in island-grid, islanded system frequency is regulated.
3) start the medium-and-large-sized water power speed regulator of island-grid, the change according to mains frequency automatically increases or reduces the power of the assembling unit, make the balance that power reaches new, and sustain pulse frequency is in certain limit, realizes generator primary frequency modulation.
4) pass through the factor of load with frequency change of setting, play the regulating action of frequency character of load, frequency is controlled.
Above-mentioned steps 1) in, wide for distribution, quantity is many and belong to the small hydropower station of local scheduling, its definite installation scale cannot be added up on the one hand, future plan construction scale also cannot be clear and definite, the Equipments Setting imperfections such as another aspect small power station speed regulator, in the reliability that the planning application stage is raising frequency stabilization simulation result, adopt too conservative emulation mode: close the speed regulator that single-machine capacity is 50MW and following Hydropower Unit.Leading island-grid is accounted for for water power, the wet season net in thermoelectricity start account for the whole network start shooting ratio lower, and to the thermoelectricity investigation model imperfection leaving spinning reserve in current emulation tool, general speed regulator promptly can improve generate output 0.1p.u., and its investigation model can output the whole spinning reserve capacity of unit, cause result of calculation partially optimistic, therefore adopt conservative emulation mode in the planning stage: the speed regulator of closing all fired power generating unit.
Above-mentioned steps 2) in, the reaction speed of direct current frequency limiter (FLC) is fast, give full play to the effect of direct current frequency limiter (FLC) in island-grid, when island-grid frequency change, first send power outside to reach the object controlling sending frequency by rapid adjustment.
Above-mentioned steps 3) in, because the frequency modulation performance such as the amplitude of accommodation and governing speed of hydro turbine governor is more excellent than fired power generating unit.Leading island-grid is accounted for for water power, the frequency modulation regulatory function of medium-and-large-sized water power speed regulator is stablized most important to maintenance mains frequency, dead band and direct current frequency limiter (FLC) dead band of its speed regulator cooperatively interact, and start after after FLC starts, system frequency exceedes its dead band.
Above-mentioned steps 4) in, consider in simulation calculation that load changes with system frequency, the reaction of assumed load frequency factor becomes by frequency the load variations caused,
represent the meritorious percent change that frequency change 1% causes,
represent the idle percent change that frequency change 1% causes,
with
value determine according to system load characteristic.System frequency changes
the burden with power variable quantity caused is
, load or burden without work variable quantity
.
Claims (4)
1. the island-grid frequency stabilization planning application method that water power is leading, is characterized in that comprising the steps:
1) for the island-grid that water power is leading, the fired power generating unit first in closedown islanded system and the speed regulator of small power station's unit, do not consider its fm role;
2) start direct current frequency limitation function in island-grid, islanded system frequency is regulated;
3) the medium-and-large-sized water power speed regulator of island-grid starts, and the change according to mains frequency automatically increases or reduces the power of the assembling unit, make the balance that power reaches new, and sustain pulse frequency is in certain limit, realizes generator primary frequency modulation;
4) play the regulating action of frequency character of load, frequency is controlled;
Above-mentioned steps 4) in, consider in simulation calculation that load changes with system frequency, assumed load frequency factor reacts the load variations caused by frequency change,
represent the meritorious percent change that frequency change 1% causes,
represent the idle percent change that frequency change 1% causes,
with
value determine according to system load characteristic, system frequency change
the burden with power variable quantity caused is
, load or burden without work variable quantity
.
2. the island-grid frequency stabilization planning application method that water power according to claim 1 is leading, it is characterized in that above-mentioned steps 1) in, wide for distribution, quantity is many and belong to the small hydropower station of local scheduling, its definite installation scale cannot be added up on the one hand, future plan construction scale also cannot be clear and definite, small power station's speed regulator Equipments Setting imperfection on the other hand, in the reliability that the planning application stage is raising frequency stabilization simulation result, adopt too conservative emulation mode: close the speed regulator that single-machine capacity is 50MW and following Hydropower Unit; Leading island-grid is accounted for for water power, the wet season net in thermoelectricity start account for the whole network start ratio lower, the planning application stage adopt guard emulation mode: the speed regulator of closing all fired power generating unit.
3. the island-grid frequency stabilization planning application method that water power according to claim 1 is leading, it is characterized in that above-mentioned steps 2) in, the reaction speed of direct current frequency limiter is fast, give full play to the effect of direct current frequency limiter in island-grid, when island-grid frequency change, first send power outside to reach the object controlling sending frequency by rapid adjustment.
4. the island-grid frequency stabilization planning application method that water power according to claim 1 is leading, is characterized in that above-mentioned steps 3) in, due to the amplitude of accommodation of hydro turbine governor and the frequency modulation performance of governing speed more excellent than fired power generating unit; Leading island-grid is accounted for for water power, the frequency modulation regulatory function of medium-and-large-sized water power speed regulator is stablized most important to maintenance mains frequency, dead band and the direct current frequency limiter dead band of its speed regulator cooperatively interact, and start after after direct current frequency limiter starts, system frequency exceedes its dead band.
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| CN105552893B (en) * | 2015-12-29 | 2020-06-30 | 中国电力科学研究院 | Control method of direct-current frequency limiter |
| CN106370946B (en) * | 2016-08-24 | 2018-10-26 | 南方电网科学研究院有限责任公司 | Method for testing frequency limit control function of direct current transmission system |
| CN106532760B (en) * | 2016-12-15 | 2019-01-29 | 中国南方电网有限责任公司电网技术研究中心 | Coordination control method for direct current frequency limit controller of island sent by multiple direct current lines |
| CN114336620A (en) * | 2022-01-29 | 2022-04-12 | 中国南方电网有限责任公司 | Prony online analysis-based direct current FLC frequency conversion dead zone control method and system |
Citations (3)
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|---|---|---|---|---|
| CN102629762A (en) * | 2012-04-24 | 2012-08-08 | 湖北省电力公司电力试验研究院 | Floating frequency difference regulation and variable rate load instruction modification-based primary frequency regulation method |
| CN102646980A (en) * | 2012-04-12 | 2012-08-22 | 山东电力研究院 | Novel primary frequency-modulation compensation control method of unit thermal generator set |
| CN202550543U (en) * | 2012-04-24 | 2012-11-21 | 湖北省电力公司电力试验研究院 | Floating frequency difference adjustment and speed variable load instruction modification-based primary frequency modulation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646980A (en) * | 2012-04-12 | 2012-08-22 | 山东电力研究院 | Novel primary frequency-modulation compensation control method of unit thermal generator set |
| CN102629762A (en) * | 2012-04-24 | 2012-08-08 | 湖北省电力公司电力试验研究院 | Floating frequency difference regulation and variable rate load instruction modification-based primary frequency regulation method |
| CN202550543U (en) * | 2012-04-24 | 2012-11-21 | 湖北省电力公司电力试验研究院 | Floating frequency difference adjustment and speed variable load instruction modification-based primary frequency modulation device |
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| 周专等.负荷频率特性对孤网频率稳定性影响分析.《四川电力技术》.2013,第36卷(第4期), * |
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