CN115764927A - Power grid peak regulation method and system based on wind, light, water and fire multi-energy complementary characteristics - Google Patents
Power grid peak regulation method and system based on wind, light, water and fire multi-energy complementary characteristics Download PDFInfo
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Abstract
The invention discloses a power grid peak regulation method and a system based on wind, light, water and fire multi-energy complementary characteristics, wherein the method comprises the following steps: a link transmission power plan considering new energy complementary output characteristics, seasons and daily load changes is made to match with power grid peak shaving; preferentially utilizing a hydroelectric generating set with regulation capacity to participate in peak regulation; calling the pumped storage power station to carry out peak clipping and valley filling if the peak clipping requirement is not met by utilizing the participation of the thermal power generating unit; if the peak regulation requirement cannot be met, orderly power utilization is carried out; starting and stopping the coal-fired unit to meet the peak regulation requirement; finally, considering the new energy power generation output control, and limiting the power generation output of the new energy power station through peak load regulation and power abandon; re-formulating a tie line power transmission plan by comprehensively considering the tie line power transmission and high-cost peak shaving resources; establishing a multi-objective joint coordination optimization model aiming at the lowest total power generation cost and the best energy-saving and emission-reducing effects of the power system; the problem that the peak regulation advantage of wind, light, water and fire multi-energy complementary characteristics cannot be brought into play in the prior art is solved.
Description
Technical Field
The invention belongs to the technical field of power grid peak shaving; in particular to a power grid peak regulation method and a system based on wind, light, water and fire multi-energy complementary characteristics.
Background
Under the 'double-carbon' target background, in recent years, the new energy industry in China is continuously developed and developed, the industrial scale and the technical equipment level continuously jump over new steps, and outstanding contribution is made to the relief of energy resource constraint and ecological environment pressure. Meanwhile, the contradiction that the new energy is not balanced and sufficient is increasingly highlighted, particularly the problem of new energy consumption is prominent, and the healthy and sustainable development of the new energy industry is seriously restricted. In the current important strategic opportunity of energy transformation in China, a clean, low-carbon, safe and efficient energy system is constructed, the energy cleaning and utilization level and the operating efficiency of a power system are improved, a new development concept is implemented, and the function of multi-energy complementation in energy safety is better exerted to become the key point of new energy research.
The electric energy can not be stored in large quantity, and the generation and the use of the electric energy are synchronous, so the generation department has to synchronously generate the electric quantity according to the required electric quantity. In order to maintain the balance of power consumption and power and keep the frequency of the system stable, the power generation department needs to change the output of the generator to adapt to the change of the power consumption load, which is called peak shaving. At present, large-scale new forms of energy insert the electric wire netting, have brought great pressure for electric power system's peak shaving, and thermal power plant needs frequently to participate in degree of depth peak shaving and guarantees the safe operation of electric wire netting, leads to thermal power plant's peak shaving pressure sharply to increase, and the life of thermal power plant's equipment reduces, and economic benefits is relatively poor. In the research of the existing peak regulation strategy, the peak regulation cost is high mostly based on configuring an energy storage system and constructing a multi-target model for optimization calculation, the peak regulation technology research of the hybrid energy storage system is not mature, the problems of incapability of accurate modeling and imperfect operation strategy exist, and the calculation of the later is complex and difficult to popularize, and the peak regulation advantage of the wind, light, water and fire multi-energy complementary characteristic cannot be exerted.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the system for power grid peak regulation based on wind, light, water and fire multi-energy complementary characteristics are provided to solve the problems that the peak regulation cost is high based on the configuration of an energy storage system, the research on the peak regulation technology of a hybrid energy storage system is not mature, the accurate modeling and operation strategy are not complete, the peak regulation strategy for constructing a multi-target model for optimization calculation is complex in calculation, the popularization is difficult, the peak regulation advantage of the wind, light, water and fire multi-energy complementary characteristics cannot be played and the like.
The technical scheme of the invention is as follows:
a power grid peak regulation method based on wind, light, water and fire multi-energy complementary characteristics comprises the following steps:
step 1, making a connecting line power transmission plan considering new energy complementary output characteristics, season and daily load changes so as to cooperate with power grid peak shaving;
step 2, preferentially utilizing a hydroelectric generating set with regulation capacity to participate in peak regulation in the peak regulation process;
step 3, utilizing a thermal power generating unit to participate in peak shaving;
step 4, if the thermal power peak regulation is not enough to meet the peak regulation requirement, calling the pumped storage power station to carry out peak clipping and valley filling under the condition of ensuring the standby level;
step 5, if the peak regulation requirements cannot be met in the steps 1 to 4, considering load demand side management and implementing orderly power utilization;
step 6, starting and stopping the coal-fired unit to meet peak regulation requirements;
step 7, finally, considering new energy power generation output control, and limiting the power generation output of the new energy power station through peak regulation and electricity abandon when the peak regulation capability of a conventional power supply and energy storage equipment of the system is not enough to enable the system to fully accept the new energy power generation output with strong fluctuation and anti-peak regulation characteristics;
step 8, comprehensively considering the technical economy of the tie line power transmission and high-cost peak shaving resources, and reformulating a tie line power transmission plan;
and 9, establishing a multi-target joint coordination optimization model aiming at the lowest total power generation cost and the best energy-saving and emission-reducing effects of the power system on the basis of satisfying the preferential consumption of the renewable energy sources.
When the peak regulation of a power grid is matched, a new energy complementary output characteristic, a connecting line power transmission plan of seasonal and daily load changes are considered, new energy units of wind power, photovoltaic and the like are preferentially arranged for power generation, the consumption of new energy is facilitated, and therefore the energy-saving and emission-reducing effects of the power system are optimal and the power generation cost is reduced.
The method for participating in peak regulation by preferentially utilizing the hydroelectric generating set with regulation capacity in the peak regulation process comprises the following steps: on one hand, the electric quantity benefit and the peak regulation capability of the hydropower station are exerted to compensate the influence of the generated output of the wind power and solar new energy unit; on the other hand, the capacity benefit of the hydropower station is utilized, the starting capacity of the thermal power unit is reduced, the operating technical economy of the thermal power unit is improved, and therefore the purposes of reducing the system installation scale, reducing the system power supply construction investment and reducing the peak shaving cost of the power system are achieved.
The method for utilizing the thermal power generating unit to participate in peak regulation comprises the following steps: and by utilizing deep peak regulation resources, the small-capacity thermal power generating unit which does not bear the base load is preferentially used for participating peak regulation in the calling process, and then the available large-capacity unit is called.
The objective function of the multi-objective joint coordination optimization model is expressed as:
minF(P)＝minE WQ
∩max{min(ΔP sm (n Mm ),m＝1,2,...,12)}
∩min{F(P T )|max(min(ΔP sm ,m＝1,2,...,12))∩min(ΔE s )}
wherein, n represents a parallel relationship; f (P), F (P) T ) The total power generation cost (or primary energy consumption; pollutant discharge amount; the power grid thermal power purchase cost); p, P T Respectively generating output of a horizontal year power station and a thermal power station; delta E s 、ΔP sm Respectively representing the level annual electric quantity shortage and the m-month electric surplus of a system or a subarea s; n is Mm Arranging the number of maintenance units for m months in the horizontal year; e WQ 、E HQ Respectively adopting new energy electric quantity and water and electricity electric quantity; e Q ＝E WQ +E HQ Abandoning new energy and water and electricity for a horizontal annual power system;
the maximum power generation output of the hydropower station and the pumped storage power station in the year of the year is respectively; r Hm 、R Pm Respectively bearing reserve capacity for hydropower and pumped storage in the month of m of the horizontal year; t is E The annual electricity generation utilization hours are expected for the power station.
The invention has the beneficial effects that:
the multifunctional complementary integrated device comprises two modes of wind-light-water complementary integration and wind-light-fire complementary integration, can obtain scene research of various multifunctional complementary integrations, realizes the collaborative optimization scheduling and intensive management of various energy sources, sets power electronics, can realize the access of the multifunctional complementary integrated power supply to a power grid, sets an isolation transformer, can electrically isolate the multifunctional complementary integrated power supply from the power grid, ensures the safety of the access of the multifunctional complementary integrated power supply to the power grid, ensures that a user, the multifunctional complementary integration and a peak regulation strategy are connected to a monitoring scheduling center, the monitoring scheduling center can monitor the whole line, ensures the stability of line transmission, prevents accidents and can perform timely detection measures, the invention realizes the 'observable, measurable, adjustable and controllable' of the whole system, the monitoring and dispatching center is connected with the peak regulation strategy, the connection sequence of the peak regulation strategy is set, and the peak regulation is achieved by the ordered combination of different peak regulation modes.
The method solves the problems that the peak regulation cost is high based on the configuration of an energy storage system, the research on the peak regulation technology of a hybrid energy storage system is not mature, the accurate modeling and operation strategy are not accurate, the peak regulation strategy for constructing a multi-target model for optimization calculation is complex in calculation and difficult to popularize, the peak regulation advantage of the wind, light, water and fire multi-energy complementary characteristic cannot be played, and the like.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the peak shaving process of the present invention.
Detailed Description
A power grid peak regulation method and system based on wind, light, water and fire multi-energy complementary characteristics comprises the following steps:
the peak shaving system of the invention comprises:
the multifunctional complementary integrated power supply has the advantages that the multifunctional complementary integrated mode is achieved, the wind-light-water complementary integrated mode and the wind-light-fire complementary integrated mode are arranged, scene research of various multifunctional complementary integrated modes can be achieved for a power supply end of a peak regulation system, collaborative optimization scheduling and intensive management of various energy sources are achieved, the multifunctional complementary integrated power supply is connected with power electronics, the power electronics comprise a frequency converter and an inverter, the voltage and the frequency of the multifunctional complementary integrated power supply can be adjusted to be alternating current voltage and frequency required by internet surfing, and the safe internet surfing of the multifunctional complementary integrated power supply is achieved.
The power electronics is connected with the isolation transformer, the isolation transformer is connected with a power grid, the multi-energy complementary integrated power supply can be connected into the power grid, the multi-energy complementary integrated power supply is electrically isolated from the power grid, and the safety of the multi-energy complementary integrated power supply connected into the power grid is ensured.
The power grid is connected with a user, the power grid connected with the user is a power distribution network, a multifunctional complementary integrated power supply supplies power to the user, consumption of new energy is facilitated, the user is connected with a monitoring center, the monitoring center is simultaneously connected with the multifunctional complementary integrated power supply and a peak regulation strategy, the monitoring center achieves 'observable, measurable, adjustable and controllable' of the whole power system, monitoring effects can be performed on the whole line, stability of line transmission is guaranteed, accidents are prevented, power consumption of the user and generated energy of a multifunctional complementary integrated power supply unit can be monitored in real time, balance of power consumption and generated energy is achieved through connection of the peak regulation strategy, and the purpose of peak regulation is achieved.
The peak regulation method comprises the following steps:
aiming at the current peak regulation situation of a power grid and the problems of increased standby demand, increased peak regulation pressure, high peak regulation cost and the like caused by large-scale renewable energy access, the invention considers the technical economy of each peak regulation means, and the peak regulation method applicable to the power grid after the access of high-capacity new energy comprises the following steps:
(1) And (4) making a connecting line power transmission plan considering the new energy complementary output characteristics, the season and the daily load change so as to match with the peak shaving of the power grid. The new energy unit has the advantages of cleanness, low carbon, reproducibility, low power generation cost and the like, but the generated output of the wind power generator set and the solar generator set has the defects of randomness, volatility, regionality, bidirectional peak regulation, low schedulability and the like, and has great influence on the power generation scheduling modes of other generator sets in the system. A link line power transmission plan considering the complementary output characteristics of new energy, seasons and daily load changes is formulated, and new energy units of wind power, photovoltaic and the like are preferentially arranged to generate power, so that the new energy consumption is facilitated, the energy-saving and emission-reducing effects of the power system are optimal, and the power generation cost is reduced.
(2) And in the peak regulation process, a hydroelectric generating set with regulation capacity is preferentially utilized to participate in peak regulation. The hydroelectric generating set also has the advantages of cleanness, low carbon, reproducibility, low power generation cost and the like. Meanwhile, the hydropower station with the regulated storage capacity has good schedulability, almost no extra loss is caused when the hydropower station bears the variable load, and the response speed is high. Therefore, on the premise of ensuring that the limited energy is fully utilized, the hydropower station is arranged to operate at the peak position of the daily load of the system or the subarea as far as possible, and the characteristics of good regulation performance and low cost are exerted. On one hand, the electric quantity benefit and the peak regulation capability of the hydropower station are fully exerted, the influence of low power generation output of randomness and low schedulability of new energy units such as wind power and solar energy is compensated, the running condition of the thermal power unit in the power system is improved, and the running technology economy of the thermal power unit is improved; on the other hand, the capacity benefit of the hydropower station can be fully utilized, the starting capacity of the thermal power generating unit is reduced, the operating technology economy of the thermal power generating unit is further improved, and the purposes of reducing the installed scale of the system, reducing the construction investment of a system power supply and reducing the peak shaving cost of the power system are achieved.
(3) And then the thermal power generating unit is used for peak regulation. And by utilizing deep peak regulation resources, a small-capacity thermal power generating unit which does not bear base load is preferentially used for participating in peak regulation in the calling process, and then an available large-capacity unit is called. The thermal power generating unit has certain regulating capacity and load response speed, high fuel supply guarantee rate and strong continuous power generation capacity, plays a role in lifting the peak in the peak regulation of the power system, calls the thermal power generating unit to participate in the peak regulation, can quickly respond to the change of the load, and ensures the safe and stable operation of the power system.
(4) And if the thermal power peak regulation is not enough to meet the peak regulation requirement, calling the pumped storage power station to carry out peak clipping and valley filling under the condition of ensuring the standby level. The pumped storage unit has the same excellent operation characteristics as the conventional hydroelectric generating set: the system has the advantages of quick start, load, long service life, low operation and maintenance cost, low accident rate, double peak regulation capacity benefits and the like. The peak regulation superiority is shown in: the method has the advantages that firstly, the residual electric power in the low-valley load period of the system is transferred to the peak load period, so that the running conditions of other power sources (such as thermal power) in the system are improved, and the equipment utilization rate and the technical economy of the whole operation of the system are improved; and secondly, the emergency power supply can be used as a quick response emergency power supply with low operation cost and undertakes the tasks of frequency modulation, phase modulation and black start of the system.
(5) And if the first 4 measures can not meet the peak regulation requirement, considering the management of the load demand side and implementing the orderly power utilization. The power utilization market is managed by both the supply and demand parties, so that the reliability of power supply is improved, the energy consumption and the cost of both the supply and demand parties are reduced, and the aims of energy conservation and emission reduction are fulfilled.
(6) And moreover, the starting and stopping of the coal-fired unit are considered to meet the peak regulation requirement. The safe and stable operation of the power system is ensured.
(7) And finally, the power generation output control of the new energy is considered, namely the power abandonment of the new energy is considered. When the peak shaving capacity of the conventional power supply and the energy storage equipment of the system is not enough to enable the system to fully accept the new energy power generation output with strong fluctuation and anti-peak shaving characteristics, the power generation output of the new energy power station is limited by the peak shaving and electricity abandonment, so that the peak shaving balance and safe and stable operation of the system are ensured.
(8) If the peak shaving strategy based on the current formulation excessively adopts high-cost peak shaving resources, the technical economy of the tie line power transmission and the high-cost peak shaving resources should be comprehensively considered, and a tie line transmission power plan should be re-formulated.
(9) And establishing a multi-energy access power system operation simulation model. Starting from the whole and actual power system, the characteristics of various power stations (including wind power, hydroelectric power, thermal power, pumped storage, peak regulation power stations and the like) in the power system are fully considered, green, low-carbon and renewable energy resources such as hydroelectric power, wind power and photovoltaic power generation in the system are fully utilized, the power generation scheduling modes of the power system on monthly maximum load days and typical weeks and hours are simulated, whether the installed capacity of the system meets the requirements of system load is checked, the optimal working position and working capacity of each power station on a daily load curve graph of the system are determined, and the status and the action of each power station in the system are evaluated. The method comprises the following steps of performing multi-objective joint coordination optimization model aiming at the lowest total power generation cost and the best energy-saving and emission-reducing effects of a power system on the basis of meeting the preferential consumption of renewable energy sources. Its objective function can be expressed as:
minF(P)＝minE WQ
∩max{min(ΔP sm (n Mm ),m＝1,2,...,12)}
∩min{F(P T )|max(min(ΔP sm ,m＝1,2,...,12))∩min(ΔE s )}
wherein, n represents a parallel relationship; f (P), F (P) T ) The total power generation cost (or primary energy consumption; discharging amount of pollutants; the power grid thermal power purchase cost); p, P T Respectively generating output of a horizontal year power station and a thermal power station; delta E s 、ΔP sm Respectively representing s-year electricity shortage and m-month electricity surplus of the system or the subarea; n is Mm Arranging the number of maintenance units for m months in the horizontal year; e WQ 、E HQ Respectively adopting new energy electric quantity and water and electricity electric quantity; e Q ＝E WQ +E HQ Abandoning new energy and water and electricity for a horizontal annual power system;
the maximum power generation output of the hydropower station and the pumped storage power station in the year of the year is respectively; r is Hm 、R Pm Respectively bearing reserve capacity for hydropower and pumped storage in the month of m of the horizontal year; t is a unit of E For the period of power stationThe electricity generation utilization hours in the hope of years.
The invention detects the electricity consumption of the load demand side and the generated energy of the multi-energy complementary integrated power supply unit in real time by monitoring the dispatching center, compares the detected electricity consumption with the data of the generated energy, considers the preferential consumption of renewable energy, the lowest total power generation cost of the power system and the best energy-saving and emission-reducing effects based on the technical economy and superiority of each peak regulation means, and adopts the priority sequence of the corresponding peak regulation means to ensure the low peak regulation cost.
Claims (5)
1. A power grid peak regulation method based on wind, light, water and fire multi-energy complementary characteristics is characterized in that: the method comprises the following steps:
step 1, making a connecting line power transmission plan considering new energy complementary output characteristics, season and daily load changes so as to cooperate with power grid peak shaving;
step 2, preferentially utilizing a hydroelectric generating set with regulation capacity to participate in peak regulation in the peak regulation process;
step 3, utilizing a thermal power generating unit to participate in peak shaving;
step 4, if the thermal power peak regulation does not meet the peak regulation requirement, calling the pumped storage power station to carry out peak clipping and valley filling under the condition of ensuring the standby level;
step 5, if the peak regulation requirements cannot be met in the steps 1 to 4, considering load demand side management and implementing orderly power utilization;
step 6, starting and stopping the coal-fired unit to meet peak regulation requirements;
step 7, finally, considering the control of the generated output of the new energy, and when the peak shaving capacity of a conventional power supply and energy storage equipment of the system is not enough to enable the system to fully accept the generated output of the new energy with strong fluctuation and anti-peak shaving characteristics, limiting the generated output of the new energy power station through peak shaving and electricity discarding;
step 8, comprehensively considering the technical economy of the tie line power transmission and high-cost peak shaving resources, and reformulating a tie line power transmission plan;
and 9, establishing a multi-target joint coordination optimization model aiming at the lowest total power generation cost and the best energy-saving and emission-reducing effects of the power system on the basis of meeting the preferential consumption of the renewable energy.
2. The power grid peak regulation method based on wind, light, water and fire multi-energy complementary characteristics is characterized in that: when the peak regulation of a power grid is matched, a new energy complementary output characteristic, a connecting line power transmission plan of seasonal and daily load changes are considered, new energy units of wind power, photovoltaic and the like are preferentially arranged for power generation, the consumption of new energy is facilitated, and therefore the energy-saving and emission-reducing effects of the power system are optimal and the power generation cost is reduced.
3. The power grid peak shaving method based on wind, light, water and fire multi-energy complementary characteristics as claimed in claim 1, wherein: the method for preferentially utilizing the hydroelectric generating set with regulation capacity to participate in peak regulation in the peak regulation process comprises the following steps: on one hand, the electric quantity benefit and the peak regulation capability of the hydropower station are exerted to compensate the influence of the generated output of the wind power and solar new energy source unit; on the other hand, the capacity benefit of the hydropower station is utilized, the starting capacity of the thermal power generating unit is reduced, the operating technology economy of the thermal power generating unit is improved, the installed scale of the system is reduced, the construction investment of a system power supply is reduced, and the peak shaving cost of the power system is reduced.
4. The power grid peak shaving method based on wind, light, water and fire multi-energy complementary characteristics as claimed in claim 1, wherein: the method for utilizing the thermal power generating unit to participate in peak shaving comprises the following steps: and by utilizing deep peak regulation resources, a small-capacity thermal power generating unit which does not bear base load is preferentially used for participating in peak regulation in the calling process, and then an available large-capacity unit is called.
5. The power grid peak shaving method based on wind, light, water and fire multi-energy complementary characteristics as claimed in claim 1, wherein: the objective function of the multi-objective joint coordination optimization model is expressed as:
wherein, n represents a parallel relationship; f (P), F (P) T ) The total power generation cost (or primary energy consumption; discharging amount of pollutants; the power grid thermal power purchase cost); p, P T Respectively generating output of a horizontal year power station and a thermal power station; delta E s 、ΔP sm Respectively representing the level annual electric quantity shortage and the m-month electric surplus of a system or a subarea s; n is Mm Arranging the number of maintenance units for m months in the horizontal year; e WQ 、E HQ Respectively the new energy abandoned electric quantity and the water and electricity abandoned electric quantity; e Q ＝E WQ +E HQ The sum of the water and electricity of new energy abandoned for the horizontal annual power system;
the maximum power generation output of the hydropower station and the pumped storage power station in the year of the year is respectively; r Hm 、R Pm Respectively bearing reserve capacity for hydropower and pumped storage in the month of m of the horizontal year; t is E The annual electricity generation utilization hours are expected for the power station.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116823000A (en) * | 2023-08-31 | 2023-09-29 | 华能澜沧江水电股份有限公司 | Hydropower compensation peak regulation analysis and evaluation method and device thereof |
| CN117559490A (en) * | 2023-03-22 | 2024-02-13 | 长沙学院 | Multi-dimensional collaborative scheduling method for energy storage power station based on carbon emission reduction |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117559490A (en) * | 2023-03-22 | 2024-02-13 | 长沙学院 | Multi-dimensional collaborative scheduling method for energy storage power station based on carbon emission reduction |
| CN117559490B (en) * | 2023-03-22 | 2024-03-29 | 长沙学院 | Multi-dimensional collaborative scheduling method for energy storage power station based on carbon emission reduction |
| CN116823000A (en) * | 2023-08-31 | 2023-09-29 | 华能澜沧江水电股份有限公司 | Hydropower compensation peak regulation analysis and evaluation method and device thereof |
| CN116823000B (en) * | 2023-08-31 | 2024-01-19 | 华能澜沧江水电股份有限公司 | Hydropower compensation peak regulation analysis and evaluation method and device thereof |
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