CN112465208B - Virtual power plant random self-adaptive robust optimization scheduling method considering block chain technology - Google Patents
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Abstract
The invention discloses a random self-adaptive robust optimization scheduling method for a virtual power plant, which takes block chain technology into consideration, and comprises the following steps: constructing a virtual power plant deterministic model taking the optimal virtual power plant overall profit as a target according to the original data; further considering uncertainty in the operation process of the virtual power plant, processing uncertainty of market electricity price by adopting a stochastic programming method, processing uncertainty of photovoltaic output by adopting a self-adaptive robust method, establishing a stochastic self-adaptive robust scheduling model of the virtual power plant, and solving by optimizing a modeling software GAMS; and finally, the virtual power plant aggregator issues the optimized day-ahead planned output result to an Ethernet workshop platform through an intelligent contract editor Remix and sends the optimized day-ahead planned output result to each distributed energy node.
Description
Technical Field
The invention belongs to the field of power supply scheduling of power systems, and particularly relates to a random adaptive robust optimization scheduling method for a virtual power plant, which takes block chain technology into account.
Background
The energy structure of China is forward and clean, the low carbon direction is changed, and renewable energy has the characteristics of dispersed geographic positions, strong randomness, large volatility, weaker controllability and the like, and provides new challenges for safe, reliable and economic operation of a power grid along with continuous expansion of the total scale of accessing the power grid. A Virtual Power Plant (VPP) aggregates various distributed energy sources such as renewable energy sources, energy storage and Demand Response (DR) through advanced communication, metering and control technologies, and participates in the operation of a power grid as a whole, so that the impact of independent grid connection of the distributed energy sources on the public grid can be reduced, and the market competitiveness of the virtual power plant is improved.
The VPP is influenced by uncertainty factors such as renewable energy output and market electricity price in the process of optimal scheduling. Aiming at the high uncertainty degree of the photovoltaic output, the photovoltaic output under the worst condition is considered by adopting a self-adaptive robust method; aiming at the lower uncertainty degree of the market electricity price, the uncertainty of the market electricity price is processed by adopting a random planning method, and a VPP random adaptive robust scheduling model is established by combining adaptive robust with random planning.
Further, the existing centralized virtual power plant management mode has the problems of unsafe information data, unreasonable profit allocation, complex management and the like. The block chain technology provides a new approach for solving some problems existing in the virtual power plant management mode by the characteristics of decentralization, openness and transparency, no tampering and the like. The method is combined with each other to establish a random self-adaptive robust optimization scheduling method for the virtual power plant, which takes the block chain technology into account.
Disclosure of Invention
Aiming at the problems, the invention provides a random self-adaptive robust optimization scheduling method for a virtual power plant, which takes block chain technology into consideration, and can effectively treat uncertainty in the operation process and ensure the openness and transparency of optimization scheduling.
The invention relates to a random self-adaptive robust optimization scheduling method for a virtual power plant, which takes a block chain technology into consideration, and specifically comprises the following steps:
step (1), constructing a VPP deterministic model aiming at maximizing virtual power plant VPP profit according to original data, and constructing a model constraint condition; the original data comprises DAM of a day-ahead energy market, RTM data of a real-time energy market and parameters of each polymerization unit of VPP; the constraints include gas turbine constraints, ESS constraints, interruptible load constraints, DAM/RTM transaction amount constraints, power balance constraints;
step (2), on the basis of a VPP deterministic model, adopting a stochastic programming method to process uncertainty of market electricity price, and adopting a self-adaptive robust method to process uncertainty of photovoltaic output, thereby establishing the VPP stochastic self-adaptive robust model; solving by adopting optimization modeling software GAMS;
and (3) the VPP aggregator issues the optimized day-ahead planned output result to an Ethernet workshop platform through an intelligent contract editor Remix and sends the optimized day-ahead planned output result to each distributed energy node.
Further, the establishing of the VPP deterministic model in step (1) specifically includes the following steps:
step 1.1: the optimization objective of the VPP owner is to maximize the cumulative profit, including revenue gained by participating DAMs and RTMs, operating costs of the gas turbine, and outage load costs, with an objective function expressed as:
wherein T is the total time period number of one day;DAM and RTM electricity prices, respectively;the purchase and sale electricity quantity of the VPP in the DAM is obtained;the electricity quantity purchased and sold by the VPP at RTM; k is a radical of formula p The electricity purchasing coefficient represents the ratio of electricity purchasing price to electricity selling price;the operating cost of the gas turbine;to interrupt load costs;
the operating cost of the gas turbine is described by a piecewise linear function:
wherein a is the fixed cost of the gas turbine; boolean variablesIndicating whether the gas turbine is operating; k l Generating cost slope for the first section of the gas turbine; g l,t Outputting the output for the first section of the gas turbine; n is a radical of l Is the number of linear segments of the gas turbine cost curve; lambda [ alpha ] su 、λ sd Respectively the start-stop cost of the gas turbine; boolean variablesRespectively indicating whether the gas turbine is started or stopped;total output for the gas turbine;
the interruptible load cost is the compensation fee of the interruptible load paid by the VPP to the user, the user is compensated according to the level of the interruptible load, and the interruptible load cost is expressed as follows:
wherein n is m Is the number of interrupt levels;a compensation price for the m-th order interrupt load;the m level load interruption amount is the t period;
step 1.2: constructing constraints of a VPP deterministic model, wherein the constraints comprise:
(1) gas turbine constraints:
wherein, g GT,max 、g GT,min Maximum and minimum output power of the gas turbine, respectively; r is a radical of hydrogen U 、r D The upward and downward ramp rates of the gas turbine;the upper limit of the output of the first section of the gas turbine is; t is t su 、t sd Respectively gas turbineMinimum on-off time of; t is t su,0 、t sd,0 Respectively the initial startup and shutdown time of the gas turbine;the total output of the gas turbine is respectively in the t period and the t-1 period; boolean variablesIndicating whether the gas turbine is operated during the t period and the t-1 period;
(2) electrical Energy Storage System (ESS) constraints:
wherein,the electric Energy Storage System (ESS) t time period and t-1 time period of the electric energy storage system; eta c 、η d Respectively the charge-discharge efficiency of the ESS;the charge and discharge capacity of the ESS respectively; s es,max 、S es,min Respectively the upper limit and the lower limit of the electric capacity of the ESS; g esc,max 、g esd,max Respectively the maximum charge and discharge power of the ESS;
(3) interruptible load constraints:
wherein,the load interruption coefficient of the mth level;the m level load interruption amount is the t period;an electrical load for a period of t;load interruption amounts of a t period and a t-1 period, respectively; l is curt,max The maximum load interruption amount in continuous time;
(4) DAM/RTM transaction amount constraints:
wherein,the power consumption of VPP in DAM in t period is respectively;respectively the purchasing and selling electric quantity of VPP in RTM at t time period; p DA,max 、S DA,max Maximum purchase and sale electricity quantity of VPP in DAM; p is RT,max 、S RT,max The maximum electricity purchasing and selling amount of the VPP at RTM is obtained;
(5) power balance constraint conditions:
Further, in the step (2), a stochastic programming method is adopted to process uncertainty of market electricity price, a self-adaptive robust method is adopted to process uncertainty of photovoltaic output, and a stochastic self-adaptive robust model of the virtual power plant is established, and the method comprises the following steps:
step 2.1: consider the case where the VPP participates in both the DAM and RTM; in the DAM stage, VPP makes a decision before the photovoltaic uncertain parameters are realized; in the RTM stage, VPP makes a decision after photovoltaic uncertain parameters and day-ahead market decisions are realized; the objective function of the stochastic adaptive robust model of the virtual power plant is represented as follows:
wherein n is p The number of power price scenes; pi (p) is the electricity price scene probability; subscripts p and s denote the p-th group of electric valence fieldsScene and the s group photovoltaic output scene; omega is an original photovoltaic scene set;
step 2.2: the random adaptive robust model considers the electricity price scene in the DAM stage, the decision variables in the day ahead are characterized by comprising subscripts p and t, the subscript p represents the p-th group of electricity price scenes, and the subscript t represents the t time period; in the RTM stage, an electricity price scene and a photovoltaic scene are considered, real-time decision variable characteristics are that subscripts p, t and s are contained, and the subscript s represents the photovoltaic output scene of the s group; the constraint conditions of the random self-adaptive robust model are as follows:
(1) day-ahead operation constraints:
(2) real-time operation constraint conditions:
further, a VPP management framework based on a block chain technology is constructed in the step (3), and comprises three main elements, namely a distributed energy node, a VPP aggregator and an intelligent electric meter; on the basis, the VPP aggregator issues the day-ahead planned output result obtained by optimization to an Ethernet platform through an intelligent contract editor Remix and sends the day-ahead planned output result to each distributed energy node; the method comprises the following steps:
step 3.1: the method comprises the following steps of constructing a VPP management framework based on a block chain technology, wherein the VPP management framework comprises three main elements, namely a distributed energy node, a VPP aggregation provider and an intelligent electric meter, and specifically comprises the following steps:
(1) distributed energy node
The virtual power plant is formed by aggregating distributed energy resources such as a photovoltaic power station, a gas turbine, an electric automobile, an energy storage system, a commercial building and the like through an advanced information technology and a software system, and all the distributed energy resources and loads have the characteristic of dispersion autonomy and can be regarded as energy nodes;
(2) virtual power plant aggregator
The virtual power plant aggregator, namely a control center of a virtual power plant operator, can provide information consultation, transaction management and wireless communication service for each distributed energy node in the virtual power plant;
(3) intelligent electric meter
In order to realize information transmission between the distributed energy nodes and the virtual power plant aggregator, each distributed energy node needs to be provided with an intelligent electric meter, and the distributed energy nodes have the functions of calculating and recording the consumption in real time;
step 3.2: the VPP aggregator issues the day-ahead planned output result obtained by optimization to an Ethernet platform through an intelligent contract editor Remix and sends the day-ahead planned output result to each distributed energy node;
because the blockchain system has the characteristics of public transparency and non-falsification, when the actual output of each distributed energy node is deviated from the planned output and needs to be punished, the required penalty can be calculated according to the planned output record in the day and the formulas (51) and (52):
compared with the prior art, the technical scheme of the invention has the following beneficial technical effects: the invention relates to a random self-adaptive robust optimal scheduling method for a virtual power plant based on a block chain technology, which can effectively process uncertainty in the operation process of the virtual power plant and ensure the openness and transparency of optimal scheduling.
Drawings
FIG. 1 is a flow chart of a virtual power plant stochastic adaptive robust optimization scheduling method in consideration of a block chain technology according to the present invention;
FIG. 2 is a graph of load demand by a VPP over a day;
FIG. 3 is a graph of photovoltaic unit output data;
FIG. 4 is a DAM power rate and RTM power rate scenario diagram;
FIG. 5 is a graph of the detailed optimization results for each aggregation unit and the power purchased and sold by VPPs at the DAM and RTM;
FIG. 6 is a day-ahead planned contribution result on the Etherhouse platform (taking the planned contribution result at time 9:00 as an example).
Detailed Description
The following describes in detail a specific implementation of the virtual power plant stochastic adaptive robust optimization scheduling method in consideration of the block chain technology with reference to the accompanying drawings.
The invention relates to a random self-adaptive robust optimization scheduling method for a virtual power plant, which takes block chain technology into account, and as shown in figure 1, the random self-adaptive robust optimization scheduling method comprises the following steps:
and 3, the VPP aggregator issues the optimized day-ahead planned output result to an Ethernet workshop platform through an intelligent contract editor Remix and sends the optimized day-ahead planned output result to each distributed energy node.
The optimization modeling software GAMS24.4 is adopted to program and solve the VPP random self-adaptive robust model considering the block chain technology, and the result shows that: VPP carries out nimble dispatch according to market price of electricity, can effectively improve VPP profit to can alleviate the power consumption peak problem, play the effect of peak clipping and valley filling. Uncertainty in the operation process of the virtual power plant can be effectively processed through a random self-adaptive robust method, and the open transparency of optimized scheduling can be guaranteed by utilizing a block chain technology.
The step 1 establishes a VPP deterministic model, and comprises the following steps:
step 1.1: the optimization goal of the VPP owner is to maximize the cumulative profitability, including revenue obtained from participation in the DAM and RTM, operating costs of the gas turbine, outage load costs, with an objective function expressed as:
wherein T is the total time period number of one day and is 24;DAM and RTM electricity prices, respectively;the purchase and sale electricity quantity of the VPP in the DAM is obtained;the electricity quantity purchased and sold by the VPP at RTM; k is a radical of p The electricity purchasing coefficient represents the ratio of electricity purchasing price to electricity selling price;the operating cost of the gas turbine;to interrupt load costs;
the operating cost of the gas turbine is described by a piecewise linear function:
wherein a is the fixed cost of the gas turbine; boolean variableIndicating whether the gas turbine is operating; k l Generating cost slope for the first section of the gas turbine; g l,t Outputting the output for the first section of the gas turbine; n is a radical of l Is the number of linear segments of the gas turbine cost curve; lambda su 、λ sd The gas turbine start-stop costs are respectively; boolean variableRespectively indicating whether the gas turbine is started or stopped;total output for the gas turbine;
the interruptible load cost is the compensation cost of the interruptible load paid by the VPP to the user, and because the influence degrees of different interrupt degrees on the user are different, the user is compensated according to the level of the interruptible load, and the interruptible load cost is expressed as:
wherein n is m Is the number of interrupt levels;a compensation price for the m-th order interrupt load;the m level load interruption amount is the t period;
step 1.2: constructing constraints of a VPP deterministic model, wherein the constraints comprise:
(1) gas turbine constraints:
wherein, g GT,max 、g GT,min Maximum and minimum output power of the gas turbine, respectively; r is U 、r D The upward and downward ramp rates of the gas turbine;the upper limit of the output of the first section of the gas turbine is; t is t su 、t sd Minimum on-off time of the gas turbine; t is t su,0 、t sd,0 Initial startup and shutdown times of the gas turbine are respectively;the total output of the gas turbine is respectively in the t period and the t-1 period; boolean variableIndicating whether the gas turbine is operated during the period t and the period t-1;
(2) electrical Energy Storage System (ESS) constraints:
wherein,the electric Energy Storage System (ESS) t time period and t-1 time period of the electric energy storage system; eta c 、η d Respectively the charge-discharge efficiency of the ESS;respectively the charge and discharge capacity of the ESS; s es,max 、S es,min Respectively the upper limit and the lower limit of the electric capacity of the ESS; g esc,max 、g esd,max The maximum charge and discharge power of the ESS respectively;
(3) interruptible load constraints:
wherein,the load interruption coefficient of the mth level;the m level load interruption amount is the t period;an electrical load for a period of t;load interruption amounts of a t period and a t-1 period, respectively; l is curt,max The maximum load interruption amount in the continuous time is adopted, so that the problem of reduction of user satisfaction caused by overlarge load interruption amount in the continuous time is solved;
(4) DAM/RTM transaction amount constraints:
wherein,the power consumption of VPP in DAM in t period is respectively;respectively the purchasing and selling electric quantity of VPP in RTM at t time period; p DA,max 、S DA,max The maximum purchasing and selling electric quantity of the VPP in the DAM is obtained; p is RT,max 、S RT,max The maximum electricity purchasing and selling amount of the VPP at RTM is obtained;
(5) power balance constraint conditions:
step 2.1: consider the case where a VPP participates in both a DAM and an RTM. In the DAM stage, VPP makes a decision before the implementation of the photovoltaic uncertain parameters; in the RTM stage, the VPP makes a decision after photovoltaic uncertain parameters and day-ahead market decisions are implemented. Therefore, the random adaptive robust model of the virtual power plant can adopt a three-layer structure max-min-max form and consists of two stages, and the target function of the model is expressed as follows:
wherein n is p The number of electricity price scenes; pi (p) is the electricity price scene probability; subscripts p and s respectively represent a p-th group of electricity price scenes and an s-th group of photovoltaic output scenes; omega is an original photovoltaic scene set;
step 2.2: compared with a deterministic model, the random adaptive robust model considers the electricity price scene in the DAM stage, the day-ahead decision variables are characterized by comprising subscripts p and t, the subscript p represents the p-th group of electricity price scenes, and the subscript t represents the t period; in the RTM stage, an electricity price scene and a photovoltaic scene are considered, real-time decision variable characteristics are that subscripts p, t and s are contained, and the subscript s represents the photovoltaic output scene of the s group; the constraint conditions of the random self-adaptive robust model are as follows:
(1) day-ahead operation constraints:
(2) real-time operation constraint conditions:
and 3, constructing a VPP management framework based on a block chain technology, wherein the VPP management framework comprises three main elements, namely a distributed energy node, a VPP aggregator and an intelligent electric meter. On the basis, the VPP aggregator issues the day-ahead planned output result obtained by optimization to an Ethernet platform through an intelligent contract editor Remix and sends the day-ahead planned output result to each distributed energy node; the method comprises the following steps:
step 3.1: the method comprises the following steps of constructing a VPP management framework based on a block chain technology, wherein the VPP management framework comprises three main elements, namely a distributed energy node, a VPP aggregation provider and an intelligent electric meter, and specifically comprises the following steps:
(1) distributed energy node
The virtual power plant is formed by aggregating distributed energy resources such as a photovoltaic power station, a gas turbine, an electric automobile, an energy storage system and a commercial building through an advanced information technology and a software system, and all the distributed energy resources and loads have the characteristic of dispersion and autonomy and can be regarded as energy nodes.
(2) Virtual power plant aggregator
The virtual power plant aggregator, namely the control center of the virtual power plant operator, can provide information consultation, transaction management and wireless communication service for each distributed energy node in the virtual power plant.
(3) Intelligent electric meter
In order to realize information transmission between the distributed energy nodes and the virtual power plant aggregator, each distributed energy node needs to be provided with an intelligent electric meter, and the distributed energy nodes have the functions of calculating and recording the consumption in real time.
Step 3.2: and the VPP aggregator issues the optimized day-ahead planned output result to an Ethernet platform through an intelligent contract editor Remix and sends the optimized day-ahead planned output result to each distributed energy node.
Due to the fact that the blockchain system has the characteristics of being transparent and incapable of being tampered, when the actual output of each distributed energy node is deviated from the planned output and needs to be punished, the needed punishment can be calculated according to the planned output record in the day and the formulas (51) and (52).
The present embodiment constitutes a VPP with a gas turbine plant, a photovoltaic plant, an ESS, and an interruptible load. Considering the case of VPPs participating in DAM, RTM, the scheduling period is set to 1 day, divided into 24 periods.
The gas turbine adopts a TAU5670 model, the specific parameters are shown in a table 1, the specific parameters of an electric energy storage system are shown in a table 2, the load demand of a VPP in one day is shown in a table 2, the interruptible load is divided into 3 stages which are all set to be 10 percent of the total load, and the compensation price of each stage is respectively 40-/MWh, 45-/MWh and 50-/MWh. The output historical data of the photovoltaic unit is shown in figure 3, and 50 groups of photovoltaic scenes are randomly generated by adopting a Monte Carlo method; the DAM power rates and RTM power rates are shown in FIG. 4.
TABLE 1TAU5670 gas turbine parameters
Solving the VPP random self-adaptive robust scheduling model by adopting an optimized modeling software GAMS24.4, wherein the VPP obtains profitsThe specific optimization results of each polymerization unit in the VPP and the purchase and sale electric quantity of the VPP in the DAM and RTM are shown in FIG. 5.
In FIG. 5(a), the gas turbine is started when the market price of electricity is higher than the cost of electricity generation, otherwise stopped; and the ESS is charged in a low electricity price period and discharged in a high electricity price period so as to obtain profits and realize the functions of peak clipping and valley filling. In fig. 5(b), the VPP selects a suitable electricity market according to the current price and the real-time price for electricity to purchase and sell electricity.
As shown in fig. 5(c), during a high electricity price period, the VPP interrupts the load partially without affecting the comfort of the user, and preferentially interrupts the first stage load. Through the combined action of interruptible loads, the VPP can sell more electric quantity in high price of electricity period to obtain bigger profit, and can alleviate the power consumption peak problem, play the effect of load is filled out in the peak clipping.
The VPP aggregator issues the day-ahead planned output result obtained by optimization to the Ethernet workshop platform, and sends the day-ahead planned output result to each distributed energy node, as shown in FIG. 6 (taking the planned output result at the time of 9:00 as an example).
Due to the fact that the blockchain system has the characteristics of being transparent and non-falsifiable, when the actual output of each distributed energy node deviates from the planned output and needs to be punished, the required penalty can be calculated according to the day-ahead planned output record shown in fig. 6 and the formulas (51) and (52).
The effectiveness and the practicability of the invention are verified by the simulation result. The invention enables the VPP to be flexibly scheduled according to the market electricity price, can effectively improve the VPP profit, can relieve the problem of power utilization peak and play a role in peak clipping and valley filling. Uncertainty in the operation process of the virtual power plant can be effectively processed through a random self-adaptive robust method, and the open transparency of optimized scheduling can be guaranteed by utilizing a block chain technology.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The block chain technology-based random adaptive robust optimization scheduling method for the virtual power plant is characterized by comprising the following steps of: the method specifically comprises the following steps:
step (1), constructing a VPP deterministic model aiming at maximizing virtual power plant VPP profit according to original data, and constructing a model constraint condition; the original data comprise DAM of a day-ahead energy market, RTM data of a real-time energy market and parameters of each polymerization unit of VPP; the constraint conditions comprise gas turbine constraint, electric energy storage system ESS constraint, interruptible load constraint, DAM/RTM transaction amount constraint and power balance constraint;
step (2), on the basis of a VPP deterministic model, adopting a stochastic programming method to process uncertainty of market electricity price, and adopting a self-adaptive robust method to process uncertainty of photovoltaic output, thereby establishing the VPP stochastic self-adaptive robust model; solving by adopting optimization modeling software GAMS; when the market electricity price is higher than the electricity generation cost, starting the gas turbine, otherwise, stopping the gas turbine; the ESS is charged in a low-price time period and discharged in a high-price time period; the VPP selects a proper power market to purchase and sell power according to the current power price and the real-time power price; in a high electricity price period, the VPP can interrupt the load partially and interrupt the first-level load preferentially on the premise of not influencing the comfort level of a user;
step (3), the VPP aggregator issues the optimized day-ahead planned output result to an Ethernet workshop platform through an intelligent contract editor Remix and sends the optimized day-ahead planned output result to each distributed energy node;
a VPP management framework based on a block chain technology is constructed in the step (3), and comprises three main elements, namely a distributed energy node, a VPP aggregation quotient and an intelligent electric meter; on the basis, the VPP aggregator issues the optimized day-ahead planned output result to an Ethernet workshop platform through an intelligent contract editor Remix and sends the result to each distributed energy node; the method comprises the following steps:
step 3.1: the method comprises the following steps of constructing a VPP management framework based on a block chain technology, wherein the VPP management framework comprises three main elements, namely a distributed energy node, a VPP aggregation provider and an intelligent electric meter, and specifically comprises the following steps:
(1) distributed energy node
The virtual power plant is formed by aggregating a photovoltaic power station, a gas turbine, an electric automobile, an energy storage system and commercial buildings, and all distributed energy sources and loads have the characteristic of dispersion and autonomy and can be regarded as energy nodes;
(2) virtual power plant aggregator
The virtual power plant aggregator, namely a control center of a virtual power plant operator, can provide information consultation, transaction management and wireless communication service for each distributed energy node in the virtual power plant;
(3) intelligent electric meter
In order to realize information transmission between the distributed energy nodes and the virtual power plant aggregator, each distributed energy node needs to be provided with an intelligent electric meter, and the distributed energy nodes have the functions of calculating and recording the sending amount in real time;
step 3.2: the VPP aggregator issues the day-ahead planned output result obtained by optimization to an Ethernet platform through an intelligent contract editor Remix and sends the day-ahead planned output result to each distributed energy node;
when deviation is generated between the actual output and the planned output of each distributed energy node and punishment is needed, calculating the needed punishment according to the planned output record before the day and the following formula:
2. the virtual power plant stochastic adaptive robust optimization scheduling method considering the block chain technology as claimed in claim 1, wherein the step (1) of establishing a VPP deterministic model specifically comprises the following steps:
step 1.1: the optimization objective of the VPP owner is to maximize the cumulative profit, including revenue gained by participating DAMs and RTMs, operating costs of the gas turbine, and outage load costs, with an objective function expressed as:
wherein T is the total time period number of one day;DAM and RTM electricity prices, respectively; p t DA 、The purchase and sale electricity quantity of the VPP in the DAM is obtained; p t RT 、The electric quantity is bought and sold by the VPP in the RTM; k is a radical of p The electricity purchasing coefficient represents the ratio of electricity purchasing price to electricity selling price;the operating cost of the gas turbine;to interrupt load costs;
the operating cost of the gas turbine is described by a piecewise linear function:
wherein a is the fixed cost of the gas turbine; boolean variablesIndicating whether the gas turbine is operating; k l Generating cost slope for the first section of the gas turbine; g is a radical of formula l,t Outputting the output for the first section of the gas turbine; n is a radical of l Is the number of linear segments of the gas turbine cost curve; lambda [ alpha ] su 、λ sd Respectively the start-stop cost of the gas turbine; boolean variablesRespectively indicating whether the gas turbine is started or stopped;is the total gas turbine output;
the interruptible load cost is the compensation fee of the interruptible load paid by the VPP to the user, the user is compensated according to the level of the interruptible load, and the interruptible load cost is expressed as follows:
wherein n is m Is the number of interrupt levels;a compensation price for the m-th order interrupt load;the m level load interruption amount is the t period;
step 1.2: constructing constraints of a VPP deterministic model, wherein the constraints comprise:
(1) gas turbine constraints:
wherein, g GT,max 、g GT,min Maximum and minimum output power of the gas turbine, respectively; r is a radical of hydrogen U 、r D The upward and downward ramp rates of the gas turbine;the upper limit of the output of the first section of the gas turbine is; t is t su 、t sd Minimum on-off time of the gas turbine; t is t su ,0 、t sd,0 Initial startup and shutdown times of the gas turbine are respectively;the total output of the gas turbine is respectively in the t period and the t-1 period; boolean variableIndicating whether the gas turbine is operated during the period t and the period t-1;
(2) electrical energy storage system ESS constraints:
wherein,the electric storage capacity of the electric energy storage system ESS in the t time period and the t-1 time period respectively; eta c 、η d Respectively the charge-discharge efficiency of the ESS;respectively the charge and discharge capacity of the ESS; s es,max 、S es,min Respectively the upper limit and the lower limit of the electric capacity of the ESS; g esc ,max 、g esd,max The maximum charge and discharge power of the ESS respectively;
(3) interruptible load constraints:
wherein,the load interruption coefficient of the mth level;for the m-th level of load interruption of t period;An electrical load for a period of t;load interruption amounts of a t period and a t-1 period, respectively; l is curt,max The maximum load interruption amount in continuous time;
(4) DAM/RTM transaction amount constraints:
0≤P t DA ≤P DA,max (22)
0≤P t RT ≤P RT,max (24)
wherein, P t DA 、The power consumption of VPP in DAM in t period is respectively; p is t RT 、Respectively the purchasing and selling electric quantity of VPP in RTM at t time period; p is DA,max 、S DA,max Maximum purchase and sale electricity quantity of VPP in DAM; p RT,max 、S RT,max The maximum electricity purchasing and selling amount of the VPP at RTM is obtained;
(5) power balance constraint conditions:
wherein, P t RES And outputting power for the photovoltaic power station.
3. The virtual power plant stochastic adaptive robust optimization scheduling method considering the block chain technology according to claim 2, wherein in the step (2), a stochastic programming method is adopted to process market electricity price uncertainty, an adaptive robust method is adopted to process photovoltaic output uncertainty, and a virtual power plant stochastic adaptive robust model is established, and the method comprises the following steps:
step 2.1: consider the case where the VPP participates in both the DAM and RTM; in the DAM stage, VPP makes a decision before the implementation of the photovoltaic uncertain parameters; in the RTM stage, VPP makes a decision after photovoltaic uncertain parameters and day-ahead market decisions are realized; the objective function of the stochastic adaptive robust model of the virtual power plant is represented as follows:
wherein n is p The number of power price scenes; pi (p) is the electricity price scene probability; subscripts p and s respectively represent a p-th group of electricity price scenes and an s-th group of photovoltaic output scenes; omega is an original photovoltaic scene set;
step 2.2: the random adaptive robust model considers the electricity price scene in the DAM stage, the decision variables in the day ahead are characterized by comprising subscripts p and t, the subscript p represents the p-th group of electricity price scenes, and the subscript t represents the t time period; in the RTM stage, an electricity price scene and a photovoltaic scene are considered, real-time decision variable characteristics are that subscripts p, t and s are contained, and the subscript s represents the photovoltaic output scene of the s group; the constraint conditions of the random self-adaptive robust model are as follows:
(1) day-ahead operation constraints:
(2) real-time operation constraint conditions:
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