CN110245863B - Electrical combination system based on electrical conversion energy storage and online regulation and control method - Google Patents
Electrical combination system based on electrical conversion energy storage and online regulation and control method Download PDFInfo
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Abstract
The invention provides an electric combined system based on electric conversion and energy storage and an online regulation and control method, and relates to the technical field of electric combined systems. The method comprises the following steps: acquiring energy source information of a current time period t, air pressure of an air storage tank and load information of the current time period t in the electric combined system; monitoring the output of the wind turbine generator at the current time t in the electric combined system and the variation of the electric load and the heat load at the current time t in the load unit, judging whether the electric combined system generates energy updating, if so, adopting an online regulation and control strategy of electric conversion energy storage, and if not, maintaining the original operation state; if T is less than T, the scheduling time period is ended, and the energy source information, the air pressure of the air storage tank and the load information are acquired again after T = T + 1; if T = T, the scheduling of this cycle is ended. Through the orderly cooperation among the electric gas conversion equipment, the gas turbine, the gas cogeneration unit, the gas boiler and the gas storage tank, the flexibility of the operation of the electric combined system is enhanced.
Description
Technical Field
The invention relates to the technical field of electrical combined systems, in particular to an electrical combined system based on electrical conversion energy storage and an online regulation and control method.
Background
China is the largest wind power generation market in the world at present, and the wind power generation capacity of China accounts for 35% of the global wind power generation capacity by 2016 years. Despite the increasing permeability of wind power, china still faces serious wind power reduction problems, especially in northern provinces. The main obstacle to wind power consumption is the lack of flexibility of the power system. However, in northern areas of China, more than 60% of generator sets are Combined Heat and Power (CHP) generator sets, and in order to ensure heating requirements, the CHP generator sets adopt an operation mode of fixing power by heat. The running mode of the cogeneration unit for fixing power by heat compresses the space of wind power on the internet, and the phenomenon of wind abandon is aggravated.
With the use of new energy being widely valued by people, the installed capacity of new energy power generation systems such as wind power and the like is continuously increased, and the installed capacity of a fan is expected to reach 2 hundred million kilowatts in 2020. However, due to the fact that the wind power plant and the power grid are not synchronous in construction, wind power characteristics are not matched with the power grid peak regulation capacity, and the like, the phenomenon of wind abandon occurs in some areas, and energy waste and economic loss are caused. The integration of renewable energy sources by an integrated energy system architecture is one of the important means for improving the utilization rate of the renewable energy sources. The natural gas and power supply-based micro-grid system is in a typical user side comprehensive energy system form, and the utilization rate of renewable energy can be improved by performing coordinated optimization on natural gas and power links in the micro-grid; in addition, technologies such as gas storage, electricity storage and potential storage can be developed in the coupling system, the utilization rate of renewable energy is improved, and a multi-element absorption technology and a multi-element energy storage technology are formed finally to reduce the phenomenon of wind abandonment. The problem of high cost and the like exists in the large-scale storage of electric power, and the cost of gas storage is relatively low, so that the gas storage technology can be vigorously developed in the microgrid. For example, redundant wind power is converted into natural gas through an electricity-to-gas technology for storage, and the phenomena of wind abandonment, light abandonment and the like are reduced.
The electricity-to-gas technology is characterized in that abundant electric energy is converted into natural gas or hydrogen and stored in a natural gas pipe network or natural gas storage equipment at the time of load valley and renewable energy output peak; and during the period of power shortage, the stored gas is converted into electric energy or heat energy to be provided for users, so that the capacity of the microgrid for consuming renewable energy during the load valley period is improved. The electric-to-gas technology also increases the coupling effect of an electric-to-gas joint link and enhances the functional stability between the power network and the natural gas network system.
The electricity-to-gas converts the electrical energy into chemical energy, which is stored by hydrogen or natural gas. The electric conversion gas technology can be divided into two stages of hydrogen electrolysis and methanation according to different final products of the electric conversion gas. Firstly, the redundant electric energy is electrolyzed by water to generate hydrogen, the energy of the redundant electric energy is used for electrolyzing the water to generate the hydrogen, the hydrogen is directly used for industrial production or is used for gas power generation under safety constraint, and the chemical equation is as follows:
2H 2 O→2H 2 +O 2 (1)
the hydrogen produced by electrolysis can be directly used, but because of the difficulty of storing and transmitting hydrogen, the hydrogen is generally in the form of electrolytic natural gas, namely methanation. Natural gas has a higher specific energy density than hydrogen and can be injected directly into existing natural gas networks for large-scale storage and long-distance transmission. The electricity-to-natural gas is to generate methane by utilizing the reaction of carbon dioxide and hydrogen under the high-temperature and high-pressure environment on the basis of hydrogen electrolysis, and the chemical equation is as follows:
CO 2 +4H 2 →CH 4 +2H 2 O (2)
the methanation process is an exothermic catalytic reaction, and carbon dioxide required by the reaction can be derived from waste gas generated in the industrial production process, fossil fuel combustion power generation, biomass, air and the like. The methanated natural gas can be injected into a natural gas network for storage, and the natural gas is generally stored in a waste oil-gas field, a water-bearing stratum or a salt cavern. The natural gas storage capacity is huge and can reach hundreds of megameters per cubic meter, which is equivalent to that the stored electric energy reaches the TW-h level. The natural gas is converted into electric energy through a fuel cell or a gas turbine at the peak time of electric load, so that an electricity-gas-electricity circulating energy storage system is formed, and the traditional energy storage equipment has small electricity-to-gas storage capacity and short discharge time, cannot effectively consume large-scale wind power, and cannot realize long-time and large-scale space-time translation of energy; the traditional energy storage equipment is optimized for a single-time section, so that the regulation and control are lack of flexibility;
disclosure of Invention
The technical problem to be solved by the invention is to provide an electrical combined system based on electrical conversion and energy storage and an online regulation and control method aiming at the defects of the prior art, and the flexibility of the operation of the electrical combined system is enhanced through the ordered matching among electrical conversion equipment, a gas turbine, a gas cogeneration unit, a gas boiler and a gas storage tank.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
on one hand, the invention provides an electrical combined system based on electrical conversion energy storage, which comprises an energy source information acquisition unit, an energy conversion unit and a load unit;
the load unit comprises an electric load unit and a thermal load unit, the electric load unit is used for providing electric load for electric equipment of the load, and the thermal load unit is used for providing thermal energy for users of the load;
the energy source information acquisition unit comprises an energy information acquisition device and a natural gas bus; the energy information collector is respectively connected with the wind turbine generator, the power grid and the energy conversion unit, and the natural gas bus is connected with the natural gas network;
the energy conversion unit includes: the system comprises electric gas conversion equipment, a gas turbine, a gas cogeneration unit, a gas boiler and a gas storage tank; the input end of the electric gas conversion equipment is connected with an electric bus, and the electric bus is connected with an electric load unit; the output end of the electric gas conversion equipment is connected with the input end of the gas storage tank; the output end of the gas storage tank is connected with the input end of the gas turbine; the output end of the gas turbine is connected with an electric bus; the energy information collector is respectively connected with the gas cogeneration unit and the gas boiler; the input end of the gas boiler is connected with a natural gas bus; the output end of the gas boiler is connected with the heat load unit; the input end of the gas cogeneration unit is connected with a natural gas bus; the output end of the gas cogeneration unit is respectively connected with the input end of the heat load unit and the electric bus;
on the other hand, the invention provides an online regulation and control method based on electrical conversion energy storage, which is realized by the electrical combination system based on electrical conversion energy storage and comprises the following steps:
step 1: 1 hour as one scheduling period and 24 scheduling periodsFor a dispatching cycle T, acquiring energy source information of the current time period T acquired by an energy information acquirer of the electrical combined system and air pressure P of an air storage tank in an energy conversion unit S And load information of the current time period t in the load unit; the energy source information comprises the gas consumption power P of the gas cogeneration unit gas,CHP And the gas consumption P of the gas boiler gas,GB Wind turbine output P F Purchasing electric power P from the grid grid (ii) a The load information includes an electrical load P E And heat load P H ；
Step 2: the wind turbine generator output P of the current time period t in the energy source information collector in the electrical combined system F And the electrical load P of the load unit for the current time period t E And heat load P H Monitoring the variable quantity, judging whether the energy of the electric combined system is updated, if so, executing a step 3, otherwise, maintaining the original running state and executing a step 1;
wherein, the condition of triggering the energy update comprises:
1) The variation of the output power of the wind turbine exceeds the threshold value Epsilon P F(t-1) ：|P F -P F(t-1) |>εP F(t-1) ；
2) The amount of change in the energy demand of the load cell exceeds the threshold τ L (t-1) ：|L-L (t-1) |>τL (t-1) ；
Wherein L = P E +P H Epsilon and tau are parameters, and the values are up-down regulation and control ranges generated according to the actual load condition; t-1 represents the last time period, and t represents the current time period;
and step 3: when the energy of the electric combined system is updated, an online regulation and control strategy of electric conversion energy storage is adopted, the regulation and control strategy is that the current situation is maintained when the supply of a gas cogeneration unit can meet the system requirement, the gas cogeneration unit is preferentially adopted to meet the heat load requirement when the supply of the gas cogeneration unit can not meet the system requirement, a gas boiler is used as a standby heat source, and the electric quantity is redistributed according to the priority principle of a user; then judging whether the electrical load meets the system requirement; if the demand is met and the electric energy is excessive, the system adopts an electric gas conversion device to convert the excessive electric energyConverting the wind power output into natural gas, and storing the natural gas in a gas storage tank; if not, the gas storage tank of the electric gas conversion device is deflated, and the gas turbine is adopted to convert the natural gas into electric energy to supply the electric load of the system or purchase the electricity P from the power grid grid ；
And 4, step 4: judging whether the current time period T of the electrical combination system is smaller than a dispatching cycle T or not, if T is smaller than T, ending the dispatching time period, and executing the step 1 after T = T + 1; if T = T, the scheduling of the present cycle is ended.
The step 3 comprises the following steps:
step 3.1: preferentially adopting a gas cogeneration unit to meet the requirement of heat load, and using a gas boiler as a standby heat source;
determining thermal load P in an electrical utility system H Whether the system demand is met by the gas combined heat and power generation unit supply, wherein the indicia that the heat load demand is determined to be met are:
in the formula, W L When =1 indicates that the heat load demand is satisfied, W L A time of =0 indicates that the thermal load demand is not satisfied; p CHP,h The heat production power of the gas cogeneration unit; wherein, the heat production power of gas cogeneration unit is:
P CHP,h ＝η CHP,h P gas,CHP
in the formula eta CHP,h Representing the heat conversion efficiency of the gas cogeneration unit; p gas,CHP Representing the gas consumption power of the gas cogeneration unit;
if W L When the boiler is in the state of being started, the boiler is started to work, and the existing working state is maintained;
if W L When =0, the supply of the gas cogeneration unit can not meet the system requirement, the gas boiler is started as the hot standby of the gas cogeneration unit and works together with the gas cogeneration unit to meet the heat load requirement:
P CHP,h +P GB,h ≥P H ；
wherein, gas boiler's heat production power:
P GB,h ＝η GB P gas,GB
in the formula, P GB,h The heat production power of the gas boiler; eta GB Representing gas boiler efficiency; p gas,GB Representing the gas consumption power of the gas boiler;
step 3.2: according to the output P of the wind turbine generator at the current time period F Electric power P of gas cogeneration unit CHP And an electrical load P E Judging whether the electric load meets the system requirement or not in the period t; the system meets the electric load demand sign:
in the formula of U t When =1, it indicates excess electric energy, U t When =0, it represents that the electric energy is insufficient;
wherein, the generating power of the gas cogeneration unit is as follows:
P CHP ＝η CHP P gas,CHP
in the formula eta CHP Indicating the electricity conversion efficiency of the gas cogeneration unit.
If U is present t If the electric load can meet the system requirement and the electric energy is excessive in the time period t, =1, namely, the electric load can meet the system requirement, the step 3.3 is carried out, and if U is in the time period t, the electric energy is excessive t If the power consumption is not less than 0, namely the electric load cannot meet the system requirement in the time period t, the step 3.4 is skipped;
step 3.3: if the generated energy is too large, the residual amount is still remained after the basic electric load is met, the system adopts an electric gas conversion device to convert redundant wind power output into natural gas, the natural gas is stored in a gas storage tank, and whether the storage capacity of the gas storage tank of the electric gas conversion equipment meets the gas storage condition or not is judged:
in the formula，V t When =1, it means that gas can be stored, V t If the value is =0, the gas storage is not possible; s s For the storage capacity, S, of the electric-to-gas storage tank at the current scheduling period s,min For the minimum storage capacity, S, in the gas storage tank for electricity to gas s,max The maximum storage capacity in the electric-to-gas storage tank.
The storage capacity of the air storage tank of the electric gas conversion equipment is as follows:
△P＝P S -P 0
in the formula, K is the gas consumption of the compressor in the gas storage tank per unit time; p a The atmospheric pressure of the altitude of the place where the electric gas conversion gas storage tank is installed is set; delta P is the air pressure P of the electric gas-converting air storage tank in the current scheduling period S And the lowest delivery pressure P 0 The amount of change in (c); k L The pressure integrated parameter of the electric gas conversion gas storage tank in the current scheduling period; q is the output gas flow of the electric gas conversion gas storage tank in the current scheduling time period;
when V is t If the storage capacity of the air storage tank of the electric gas conversion equipment does not meet the air storage condition, jumping to the step 4; if V t If the capacity of the electric-to-gas storage tank meets the gas storage condition in the case of 1, storing redundant wind power-converted natural gas in the gas storage tank, and then jumping to the step 3.5;
wherein, the electric energy that the electricity changes gas equipment to consume does:
in the formula, P P2G Representing the power consumed by the electrical to gas equipment; h g Represents the heating value of natural gas; eta P2G The conversion efficiency of the electric gas conversion equipment is shown;
step 3.4: if the electric load can not meet the basic electric load requirement of the system in the time period t, judging whether the storage capacity of an air storage tank of the electric gas conversion device meets the air release condition; if yes, an air storage tank of the electric gas conversion device is deflated, natural gas is converted into electric energy by adopting a gas turbine to be supplied to an electric load of the system, and then the step 3.5 is skipped; if not, purchasing power P from the power grid grid ；
The air bleeding conditions are as follows:
in the formula, X t If =1, X means that air can be released t Indicating that no air can be discharged when = 0;
wherein, the electric quantity is purchased to the electric wire netting when the gas holder can not deflate:
P grid ＝P E -P CHP -P F
in the formula, P grid Indicating the electricity purchasing quantity to the power grid when the gas storage tank cannot be deflated;
power generation of gas turbine:
P GT ＝η GT QH g
in the formula, P GT Representing the power generated by the gas turbine; eta GT Representing the conversion efficiency of the gas turbine;
step 3.5: judging whether the current time interval t reaches the electric energy balance state:
in the formula, if Y is t If the current value is 1, namely the electric energy balance state is achieved, jumping to the step 4; if Y is t If the power supply is not in the power balance state, the power supply is purchased to the power grid, and the power supply is not in the power balance state when the power supply is not in the power balance state and the power supply is not in the power balance state grid Returning to the step 4 until the electric energy is balanced;
wherein, the electric energy is in when balanced state to the electric wire netting purchase electric quantity:
P grid ＝P E -P CHP -P F -P GT
in the formula, P grid The power is purchased to the power grid when the power balance is achieved.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention provides an electric combined system based on electric conversion energy storage and an online regulation and control method, wherein the system carries out unit processing on the electric-gas combined system, so that the electric-gas combined system is convenient to control and execute an online regulation and control strategy, in order to stabilize the fluctuation of wind power output and load requirements, the invention provides the online regulation and control strategy, the strategy utilizes electric-to-gas equipment to improve the wind power consumption capacity of an electric-gas interconnected comprehensive energy system, and simultaneously, the fluctuation of load can be effectively slowed down at the time of low ebb of electric load and the peak time of wind power output; the bidirectional energy flow between the power network and the natural gas network is realized through the electric gas conversion equipment and the gas turbine, the coupling of the electric-gas network is enhanced, and the energy utilization efficiency is improved, so that the stability of the system is improved. The energy is distributed through an online regulation and control strategy of electricity-gas conversion energy storage, so that the system has a good and flexible regulation and control effect. Compared with the traditional energy storage equipment, the method has the advantages of large electricity-to-gas storage capacity and long discharge time, and can effectively absorb large-scale wind power and realize long-time and large-scale space-time translation of energy; the gas turbine set and the electricity-to-gas technology realize bidirectional energy flow between the power network and the natural gas network, enhance the coupling of the electricity-gas network, and improve the energy utilization efficiency so as to improve the system stability;
drawings
Fig. 1 is a structural diagram of an electrical combined system for electrical conversion and energy storage according to an embodiment of the present invention;
fig. 2 is a flowchart of an online control method for electrical conversion energy storage according to an embodiment of the present invention;
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The method of this example is as follows.
In one aspect, the present invention provides an electrical combination system based on electrical conversion energy storage, as shown in fig. 1, including an energy source information acquisition unit, an energy conversion unit, and a load unit;
the load unit comprises an electric load unit and a thermal load unit, the electric load unit is used for providing electric load for electric equipment of the load, and the thermal load unit is used for providing thermal energy for users of the load;
the energy source information acquisition unit is used for acquiring information of the output end of the wind turbine generator, information of a power grid and information of a natural gas bus; the energy information acquisition device comprises an energy information acquisition device and a natural gas bus; the energy information collector is respectively connected with the wind turbine generator, the power grid and the energy conversion unit, and the natural gas bus is connected with a natural gas network;
the energy conversion unit includes: the system comprises an electric gas conversion device (P2G), a gas turbine, a gas combined heat and power generation unit (CHP), a gas boiler and a gas storage tank; the input end of the electric gas conversion equipment is connected with an electric bus, and the electric bus is connected with an electric load unit; the output end of the electric gas conversion equipment is connected with the input end of the gas storage tank; the output end of the gas storage tank is connected with the input end of the gas turbine; the output end of the gas turbine is connected with an electric bus; the energy information collector is respectively connected with the gas cogeneration unit and the gas boiler; the input end of the gas boiler is connected with a natural gas bus; the output end of the gas boiler is connected with the heat load unit; the input end of the gas cogeneration unit is connected with a natural gas bus; the output end of the gas cogeneration unit is respectively connected with the input end of the heat load unit and the electric bus;
the energy conversion unit is used as an energy hub of an electrical combined system, and takes into account two coupling forms of an electrical gas conversion device and a gas turbine. By monitoring the gas pressure P of the gas storage tank in the current time period S To determine the operation state of the air storage tank. And the electricity is converted into gas to convert redundant wind power into natural gas, and the natural gas is injected into a gas storage tank for storage. On the contrary, the gas turbine collects the obtained electric energy to an electric bus by consuming the natural gas in the gas storage tank, thereby realizing the bidirectional energy flow between the power network and the natural gas network.
On the other hand, the invention provides an online regulation and control method based on electricity-gas conversion energy storage, which is realized by the electric combined system based on electricity-gas conversion energy storage, as shown in fig. 2, and comprises the following steps:
step 1: taking 1 hour as a scheduling time interval and 24 scheduling time intervals as a scheduling cycle T, and acquiring energy source information of the current time interval T in an energy source information acquisition device of the electric-gas combined system and air pressure P of an air storage tank in an energy conversion unit S And load information of the current time period t in the load unit; the energy source information comprises the gas consumption power P of the gas cogeneration unit gas,CHP And the gas consumption P of the gas boiler gas,GB Wind turbine output P F Purchasing electric power P from the grid grid (ii) a The load information includes an electrical load P E And heat load P H ；
Step 2: wind turbine generator output P of current time period t in energy source information collector in electricity-gas combined system F And the electrical load P of the load unit for the current time period t E And heat load P H Monitoring the variable quantity, judging whether the energy of the electric-gas combined system is updated, if so, executing a step 3, otherwise, maintaining the original running state and executing a step 1;
wherein, the condition of triggering the energy update comprises:
1) The variable quantity of the output of the wind turbine exceeds a certain threshold value: i P F -P F(t-1) |>εP F(t-1) ；
2) The amount of change in load cell energy demand exceeds a certain threshold: L-L (t-1) |>τL (t-1) ；
Wherein L = P E +P H Epsilon and tau are parameters, and the values of epsilon and tau are up-down regulation and control ranges generated according to actual load conditions; t-1 represents the last time period, and t represents the current time period; l is a radical of an alcohol (t-1) ＝P E (t-1)+P H (t-1)；
And step 3: when the energy of the electricity-gas combined system is updated, an online regulation strategy based on electricity-gas conversion energy storage is adopted, and the regulation strategy is a gas-electricity-gas combined heat and power systemThe current situation is maintained when the supply of the generator set can meet the system requirement, the gas cogeneration unit is preferentially adopted to meet the requirement of heat load when the supply of the gas cogeneration unit cannot meet the system requirement, the gas boiler is used as a standby heat source, and the electric quantity is redistributed according to the priority principle of users; then judging whether the electrical load meets the system requirement; if the demand is met and the electric energy is excessive, the system adopts an electric-to-gas device to convert the excessive wind power output into natural gas and store the natural gas in a gas storage tank; if not, the gas storage tank of the electric gas conversion device is deflated, and the gas turbine is adopted to convert the natural gas into electric energy to supply the electric load of the system or purchase the electricity P from the power grid grid (ii) a The method comprises the following specific steps:
step 3.1: because the fixed parts in the heat load and the electric load have uncontrollable performance, a gas-fired cogeneration unit is preferably adopted to meet the requirement of the heat load, and a gas-fired boiler is used as a standby heat source;
judging thermal load P in electric-gas combined system H Whether the system demand is met by the gas combined heat and power generation unit supply, wherein the indicia that the heat load demand is determined to be met are:
in the formula, W L When =1 indicates that the heat load demand is satisfied, W L If =0, the thermal load demand is not satisfied; p CHP,h The heat production power of the gas cogeneration unit; wherein, the heat production power of gas cogeneration unit is:
P CHP,h ＝η CHP,h P gas,CHP
in the formula eta CHP,h The heat conversion efficiency of the gas cogeneration unit is represented; p gas,CHP Representing the gas consumption power of the gas cogeneration unit;
if W L When the boiler is in the state of being started, the boiler is started to work, and the existing working state is maintained;
if W L When =0, namely the supply of the gas cogeneration unit cannot be satisfiedThe system requirement, gas boiler is as the hot reserve start-up of gas combined heat and power generation unit, and the heat load demand is satisfied with gas combined heat and power generation unit combined work:
P CHP,h +P GB,h ≥P H ；
wherein, gas boiler's heat production power:
P GB,h ＝η GB P gas,GB
in the formula, P GB,h The heat production power of the gas boiler; eta GB Representing gas boiler efficiency; p gas,GB Representing the gas consumption power of the gas boiler;
step 3.2: according to the output P of the wind turbine generator at the current time period F Electric power P of gas cogeneration unit CHP And an electrical load P E Judging whether the electric load meets the system requirement in the period t; the system meets the electric load demand sign:
in the formula of U t When =1, it indicates excess electric energy, U t When =0, it represents that the electric energy is insufficient;
wherein, the generating power of the gas cogeneration unit is as follows:
P CHP ＝η CHP P gas,CHP
in the formula eta CHP Indicating the electricity conversion efficiency of the gas cogeneration unit.
If U is present t If the electric load can meet the system requirement and the electric energy is excessive in the time period t, =1, namely, the electric load can meet the system requirement, the step 3.3 is carried out, and if U is in the time period t, the electric energy is excessive t If the power consumption is not less than 0, namely the electric load cannot meet the system requirement in the time period t, the step 3.4 is skipped;
step 3.3: if the generated energy is too large, the residual amount is still remained after the basic electric load is met, the system adopts an electric gas conversion device to convert redundant wind power output into natural gas, the natural gas is stored in a gas storage tank, and whether the storage capacity of the gas storage tank of the electric gas conversion equipment meets the gas storage condition or not is judged:
in the formula, V t When =1, it means that gas can be stored, V t If the value is =0, the gas storage is not possible; s s For the storage capacity, S, of the electric-to-gas storage tank at the current scheduling period s,min For the minimum storage capacity, S, in the gas storage tank for electricity to gas s,max The maximum storage capacity in the electric-to-gas storage tank.
The storage capacity of the air storage tank of the electric gas conversion equipment is as follows:
△P＝P S -P 0
in the formula, K is the gas consumption of the compressor in the gas storage tank per unit time; p a The atmospheric pressure of the altitude of the place where the electric-to-gas storage tank is installed is set; delta P is the air pressure P of the electric-to-gas air storage tank in the current scheduling period S And the lowest delivery pressure P 0 The amount of change in (c); k L The pressure integrated parameter of the electric gas conversion gas storage tank in the current scheduling period; q is the output gas flow of the electric gas conversion gas storage tank in the current scheduling time period;
when V is t If the storage capacity of the air storage tank of the electric gas conversion equipment does not meet the air storage condition, jumping to the step 4; if V t If the capacity of the electric-to-gas storage tank meets the gas storage condition in the case of 1, storing redundant wind power-converted natural gas in the gas storage tank, and then jumping to the step 3.5;
wherein, the electric energy that the electricity changes gas equipment to consume does:
in the formula (I), the compound is shown in the specification,P P2G representing the power consumed by the electrical to gas equipment; h g Represents the heating value of natural gas; eta P2G Indicating the conversion efficiency of the electric gas conversion equipment;
step 3.4: if the electric load can not meet the basic electric load requirement of the system in the time period t, judging whether the storage capacity of an air storage tank of the electric gas conversion device meets the air release condition; if yes, an air storage tank of the electric gas conversion device is deflated, natural gas is converted into electric energy by adopting a gas turbine to be supplied to an electric load of the system, and then the step 3.5 is skipped; if not, purchasing power P from the power grid grid ；
The air bleeding conditions are as follows:
in the formula, X t If =1, X means that air can be released t Indicating that no air can be discharged when = 0;
wherein, the electric quantity is purchased to the electric wire netting when the gas holder can not deflate:
P grid ＝P E -P CHP -P F
in the formula, P grid Indicating the electricity purchasing quantity to the power grid when the gas storage tank cannot be deflated;
power generation of gas turbine:
P GT ＝η GT QH g
in the formula, P GT Representing the power generated by the gas turbine; eta GT Representing the conversion efficiency of the gas turbine;
step 3.5: judging whether the current time interval t reaches the electric energy balance state:
in the formula, if Y is t If the current value is not less than 1, namely the electric energy balance state is reached, jumping to the step 4; if Y is t If the power supply is not in the power balance state, the power supply is purchased to the power grid, and the power supply is not in the power balance state when the power supply is not in the power balance state and the power supply is not in the power balance state grid Returning to the step until the electric energy is balancedStep 4;
wherein, the electric energy is in when balanced state to the electric wire netting purchase electric quantity:
P grid ＝P E -P CHP -P F -P GT
in the formula, P grid The power is purchased to the power grid when the power balance is achieved.
And 4, step 4: judging whether the current time period T of the power-gas combined system is smaller than a scheduling period T or not, if T is smaller than T, ending the scheduling time period, and executing the step 1 after T = T + 1; if T = T, the scheduling of the present cycle is ended.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (3)
1. An electrical combination system based on electrical conversion energy storage is characterized in that: the system comprises an energy source information acquisition unit, an energy conversion unit and a load unit;
the load unit comprises an electric load unit and a thermal load unit, the electric load unit is used for providing electric load for electric equipment of the load, and the thermal load unit is used for providing thermal energy for users of the load;
the energy source information acquisition unit comprises an energy information acquisition device and a natural gas bus; the energy information collector is respectively connected with the wind turbine generator, the power grid and the energy conversion unit, and the natural gas bus is connected with the natural gas network;
the energy conversion unit includes: electric gas conversion equipment, a gas turbine, a gas-heat cogeneration unit, a gas boiler and a gas storage tank; the input end of the electric gas conversion equipment is connected with an electric bus, and the electric bus is connected with an electric load unit; the output end of the electric gas conversion equipment is connected with the input end of the gas storage tank; the output end of the gas storage tank is connected with the input end of the gas turbine; the output end of the gas turbine is connected with an electric bus; the energy information collector is respectively connected with the gas cogeneration unit and the gas boiler; the input end of the gas boiler is connected with a natural gas bus; the output end of the gas boiler is connected with the heat load unit; the input end of the gas cogeneration unit is connected with a natural gas bus; and the output end of the gas combined heat and power generation unit is respectively connected with the input end of the heat load unit and the electric bus.
2. An on-line regulation and control method based on electrical conversion energy storage is realized by the electrical combination system based on electrical conversion energy storage of claim 1, and is characterized in that: the method comprises the following steps:
step 1: taking 1 hour as a scheduling time interval and 24 scheduling time intervals as a scheduling cycle T, and acquiring energy source information of the current time interval T acquired by an energy information acquirer of the electrical combined system and air pressure P of an air storage tank in an energy conversion unit S And load information of the current time period t in the load unit; the energy source information comprises the gas consumption power P of the gas cogeneration unit gas,CHP And the gas consumption power P of the gas boiler gas,GB Wind turbine output P F Purchasing electric power P from the grid grid (ii) a The load information includes an electrical load P E And heat load P H ；
Step 2: the wind turbine generator output P of the current time period t in the energy source information collector in the electrical combined system F And the electrical load P of the load unit for the current time period t E And heat load P H Monitoring the variable quantity, judging whether the energy of the electric combined system is updated, if so, executing a step 3, otherwise, maintaining the original running state and executing a step 1;
wherein, the condition of triggering energy update comprises:
1) The variation of the output power of the wind turbine exceeds the threshold value Epsilon P F(t-1) ：|P F -P F(t-1) |>εP F(t-1) ；
2) The amount of change in the energy demand of the load cell exceeds the threshold τ L (t-1) ：|L-L (t-1) |>τL (t-1) ；
Wherein L = P E +P H Epsilon and tau are parameters, and the values are up-down regulation and control ranges generated according to the actual load condition; t-1 represents the last time period, and t represents the current time period;
and step 3: when the energy of the electric combined system is updated, an online regulation and control strategy of electric conversion energy storage is adopted, the regulation and control strategy is that the current situation is maintained when the supply of a gas cogeneration unit can meet the system requirement, the gas cogeneration unit is preferentially adopted to meet the heat load requirement when the supply of the gas cogeneration unit can not meet the system requirement, a gas boiler is used as a standby heat source, and the electric quantity is redistributed according to the priority principle of a user; then judging whether the electrical load meets the system requirement; if the demand is met and the electric energy is excessive, the system adopts an electric-to-gas device to convert the excessive wind power output into natural gas and store the natural gas in a gas storage tank; if the natural gas is not satisfied, the gas storage tank of the electric gas conversion device is deflated, and the natural gas is converted into electric energy by adopting a gas turbine to supply the electric load of the system or purchase the electricity P from the power grid grid ；
And 4, step 4: judging whether the current time period T of the electrical combination system is smaller than a dispatching cycle T or not, if T is smaller than T, ending the dispatching time period, and executing the step 1 after T = T + 1; if T = T, the scheduling of the present cycle is ended.
3. The on-line regulation and control method based on the electric conversion energy storage is characterized in that: the step 3 comprises the following steps:
step 3.1: preferentially adopting a gas cogeneration unit to meet the requirement of heat load, and using a gas boiler as a standby heat source;
determining thermal load P in an electrical utility system H Whether the system demand is met by the gas combined heat and power generation unit supply, wherein the indicia that the heat load demand is determined to be met are:
in the formula, W L When =1 indicates that the heat load demand is satisfied, W L A time of =0 indicates that the thermal load demand is not satisfied; p is CHP,h The heat production power of the gas cogeneration unit; wherein, the heat production power of gas cogeneration unit is:
P CHP,h ＝η CHP,h P gas,CHP
in the formula eta CHP,h Representing the heat conversion efficiency of the gas cogeneration unit; p gas,CHP Representing the gas consumption power of the gas cogeneration unit;
if W L When the boiler is in the state of being started, the boiler is started to work, and the existing working state is maintained;
if W L When =0, the supply of the gas cogeneration unit can not meet the system requirement, the gas boiler is started as the hot standby of the gas cogeneration unit and works together with the gas cogeneration unit to meet the heat load requirement:
P CHP,h +P GB,h ≥P H ；
wherein, gas boiler's heat production power:
P GB,h ＝η GB P gas,GB
in the formula, P GB,h The heat production power of the gas boiler; eta GB Representing gas boiler efficiency; p is gas,GB Representing the gas consumption power of the gas boiler;
step 3.2: according to the output P of the wind turbine generator at the current time period F Electric power P of gas cogeneration unit CHP And an electrical load P E Judging whether the electric load meets the system requirement in the period t; the system meets the electric load demand sign:
in the formula of U t 1 indicates excess of electric energy, U t If =0, the power is insufficient;
wherein, the generating power of the gas cogeneration unit is as follows:
P CHP ＝η CHP P gas,CHP
in the formula eta CHP Representing the electricity conversion efficiency of the gas cogeneration unit;
if U is present t If the electric load can meet the system requirement and the electric energy is excessive in the time period t, =1, namely, the electric load can meet the system requirement, the step 3.3 is carried out, and if U is in the time period t, the electric energy is excessive t If the power consumption is not less than 0, namely the electric load cannot meet the system requirement in the time period t, the step 3.4 is skipped;
step 3.3: if the generated energy is too large, the residual amount is still remained after the basic electric load is met, the system adopts an electric gas conversion device to convert redundant wind power output into natural gas, the natural gas is stored in a gas storage tank, and whether the storage capacity of the gas storage tank of the electric gas conversion equipment meets the gas storage condition or not is judged:
in the formula, V t When =1, it means that gas can be stored, V t If the value is =0, the gas storage is not possible; s s For the storage capacity, S, of the electric-to-gas storage tank at the current scheduling period s,min For minimum storage capacity, S, in gas-storage tanks for electric conversion s,max The maximum storage capacity in the electric-to-gas storage tank is obtained;
the storage capacity of the air storage tank of the electric gas conversion equipment is as follows:
△P＝P S -P 0
in the formula, K is the gas consumption of the compressor in the gas storage tank per unit time; p a Is provided with an electric gas-converting gas storage tankAtmospheric pressure at ground altitude; delta P is the air pressure P of the electric gas-converting air storage tank in the current scheduling period S And the lowest delivery pressure P 0 The amount of change of (c); k is L The pressure integrated parameter of the electric gas conversion gas storage tank in the current scheduling period; q is the output gas flow of the electric gas conversion gas storage tank in the current scheduling time period;
when V is t If the storage capacity of the air storage tank of the electric gas conversion equipment does not meet the air storage condition, jumping to the step 4; if V t If the capacity of the electric-to-gas storage tank meets the gas storage condition in the case of 1, storing redundant wind power-converted natural gas in the gas storage tank, and then jumping to the step 3.5;
wherein, the electric energy that the electricity changes gas equipment to consume does:
in the formula, P P2G Representing the power consumed by the electrical to gas equipment; h g Represents the heating value of natural gas; eta P2G Indicating the conversion efficiency of the electric gas conversion equipment;
step 3.4: if the electric load can not meet the basic electric load requirement of the system in the period of t, judging whether the storage capacity of the air storage tank of the electric gas conversion device meets the air release condition; if yes, an air storage tank of the electric gas conversion device is deflated, natural gas is converted into electric energy by adopting a gas turbine to be supplied to an electric load of the system, and then the step 3.5 is skipped; if not, purchasing power P from the power grid grid ；
The air bleeding conditions are as follows:
in the formula, X t If =1, X means that air can be released t Indicating that no air can be discharged when = 0;
wherein, the electric quantity is purchased to the electric wire netting when the gas holder can not deflate:
P grid ＝P E -P CHP -P F
in the formula, P grid Indicating the electricity purchasing quantity to the power grid when the gas storage tank cannot be deflated;
power generation of gas turbine:
P GT ＝η GT QH g
in the formula, P GT Representing the power generated by the gas turbine; eta GT Represents the conversion efficiency of the gas turbine;
step 3.5: judging whether the current time interval t reaches an electric energy balance state:
in the formula, if Y is t If the current value is not less than 1, namely the electric energy balance state is reached, jumping to the step 4; if Y is t If the power supply is not in the power balance state, the power supply is purchased to the power grid, and the power supply is not in the power balance state when the power supply is not in the power balance state and the power supply is not in the power balance state grid Returning to the step 4 until the electric energy is balanced;
wherein, the electric energy is in when balanced state to the electric wire netting purchase electric quantity:
P grid ＝P E -P CHP -P F -P GT
in the formula, P grid The power is purchased to the power grid when the power balance is achieved.
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