CN111723908A - Real-time scheduling model of wind power-containing power system based on deep learning - Google Patents
Real-time scheduling model of wind power-containing power system based on deep learning Download PDFInfo
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G06Q10/06312—Adjustment or analysis of established resource schedule, e.g. resource or task levelling, or dynamic rescheduling
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a deep learning-based real-time scheduling model of a wind power-containing power system, which adopts a deep neural network to obtain a scheduling strategy: firstly, considering environmental economy in a traditional optimization scheduling model, and calculating a scheduling strategy and cost as the output of a deep neural network; then, according to the characteristics of input and output data of power grid dispatching, different activation functions among layers of the deep neural network are designed, and wider output is captured; finally, an improved deep neural network parameter initialization method is provided, and convergence speed is improved. The real-time scheduling model fully considers the environmental economic influence of the wind power-containing power system, reduces the scheduling strategy acquisition time by using a data driving method, and ensures that the system acquires a scheduling plan in real time.
Description
Technical Field
The invention relates to the technical field of power system correlation, in particular to a wind power-containing power system real-time scheduling model based on deep learning.
Background
With the rapid development of wind power, the large-scale wind power integration can effectively relieve the power utilization pressure. However, in a wind power system, how to coordinate the output of the traditional thermal power generating unit and reduce the consumption of coal resources and environmental pollution is an important subject in the current research.
In the current scheduling calculation method for the wind power system, a model method is adopted. However, the traditional optimal scheduling model of the wind power system has more constraint conditions, relatively longer calculation time and complex calculation; and (3) solving the dynamic scheduling model considering the wind energy uncertainty by adopting a genetic algorithm so as to easily converge to a local optimal solution. The above problems can not complete the real-time scheduling of the system according to the wind power change, and the actual operation requirements can not be met. Considering that a deep neural network is the most effective machine learning method and is widely applied to the problems of prediction and classification of a power system, a data driving method considering the time-space correlation characteristic of data is urgently needed to be applied to real-time scheduling optimization calculation to guide actual engineering.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a wind power-containing power system real-time scheduling model based on deep learning.
A wind power-containing electric power system real-time scheduling model based on deep learning comprises the following steps:
step 1, obtaining the generated energy of a wind generating set and a thermal generating set at the current moment according to a system topological structure;
step 2, substituting the data of the wind generating set and the thermal generating set at the current moment into the trained real-time scheduling model based on the deep neural network; the real-time scheduling model training process based on the deep neural network is as follows:
system topology information and generating capacity data at different moments are input as a real-time scheduling model, the minimum cost of coal resource consumption and environmental pollution of a traditional thermal power generating unit, standby of a wind generating unit and the like is considered as an optimization target, and corresponding scheduling decisions and cost are calculated and serve as output of the real-time scheduling model;
wherein, the optimization objective function can be expressed as:
in the formula (1)Represents the electricity purchasing cost and C of the thermal generator setEFIs defined as the environmental pollution cost of the thermal generator set,Representing the electricity purchasing cost and C of the wind generating setWRRepresenting the standby cost of the wind power generator set; wherein n isGIndicates the number of thermal power generation groups in the system, nWRepresenting the number of wind power generation groups in the system;
the system constraints are:
in the formula:the initial output of the generator node is characterized,characterizing the initial load of a node, Gij、BijRespectively representing the real part and the imaginary part of corresponding elements in the admittance matrix; u shapei、UjRepresenting the voltage amplitudes, theta, of nodes i, j, respectivelyij=θi-θjRepresenting the voltage angle difference between the node i and the node j, i and j are the first end node and the tail end node of the line where the tangent point needs to be adjusted, iU、 iθrespectively representing the voltage amplitude value and the upper limit value and the lower limit value of the phase angle of the node i; ijPrespectively representing the upper limit value and the lower limit value of the power of the lines i-j; GiP、 GiQ、respectively representing the upper limit and the lower limit of active power output and reactive power output of a generator node;
designing a deep neural network model activation function: the activation function of the last layer of the deep neural network is designed to be linear, the activation functions of the feedforward transfer functions of other layers are designed to be ReLU activation functions, and then the form of the feedforward transfer function can be expressed as follows:
wherein l represents the number of layers of the deep neural network, n is the total number of layers of the deep neural network,is the transfer function of the l-th layer, xl-1For the input of the l layer, theta is an optimized parameter in the calculation process of the deep neural network, and W islAnd blA weight matrix and an offset vector between the l layer and the l-1 layer are obtained;
improving initialization parameters of the deep neural network model:
design of forward propagation initialization:
the activation function for top-layer forward propagation is as follows:
zi=wiyi+bi,yi=Ri(zi-1) (7)
suppose yi、ziAre independent of each other, provided with wi-1A symmetrical distribution around 0, bi-1=0,zi-1Has a mean value of zero and has a symmetrical distribution; due to yiIs derived from the ReLU function, then:
the sufficient conditions for the above formula to initialize correctly are:
thus, it follows:
and (3) reverse propagation initialization design:
for the back propagation process, the corresponding partial derivatives are:
in the formula, superscript T represents matrix transposition; same forward propagation, assuming R'Independently of each other, considering that the gradient is not a sufficient condition for being exponentially large or small, there are:
w is aligned and propagated in opposite directions by the formulas (10) and (12)iThe variance is obtained, and the balance needs to be obtained:
then, the weight parameter w of the deep neural network is initialized to zero mean gaussian distribution, the standard deviation thereof is only required to solve the square root of the formula (13), and the deviation b is initialized to 0;
completing the offline training of the deep neural network model by using the confirmed input data, output data, activation function and initial data;
step 3, obtaining a real-time scheduling strategy according to the calculation result of the deep neural network model:
and during on-line calculation, substituting the real-time data into the trained real-time scheduling model to obtain the scheduling plan at the current moment and corresponding cost.
Step 4, judging whether the scheduling result meets all constraint requirements of the system: if the current time is in line with the preset time, outputting a scheduling plan and corresponding cost; if not, returning to the recalculation.
The invention has the beneficial effects that:
(1) the method obtains the power system scheduling strategy based on the DNN model, and gives full play to the superiority of data driving. The DNN can be trained and learned according to mass historical data, only time is spent in offline training, a scheduling strategy can be given quickly in an online application stage, real-time scheduling problems can be effectively solved, a real-time scheduling scheme is given to a decision maker, and the safe and stable operation of the system is guaranteed more effectively;
(2) the deep neural network has strong learning ability, and can be suitable for other different working condition scenes by adding corresponding samples according to different topologies and application scenes for supplementary training, so that the method has strong applicability;
(3) the invention takes the power generation cost of the traditional thermal power generation, the environmental impact cost of a thermal power unit, the installation and operation cost of wind power operation, the wind power standby cost caused by wind power uncertainty and the like into consideration, ensures that the obtained scheduling strategy is more economical, takes the environmental cost and the environmental impact into more consideration, and accords with the aim of green development of the current society.
Drawings
FIG. 1 is a diagram of a real-time scheduling model based on a deep neural network.
FIG. 2 is a flow chart of real-time scheduling of a wind-powered electrical power system in view of environmental economics.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, but not limiting, of the invention. In order to make the technical means, creation features, achievement purposes and effects of the invention easy to understand, the invention is further described by combining the following specific embodiments:
example 1
As shown in the first figure, the present invention comprises the following steps:
step 1, obtaining the generated energy of a wind generating set and a thermal generating set at the current moment according to a system topological structure;
step 2, substituting the data of the wind generating set and the thermal generating set at the current moment into the trained real-time scheduling model based on the deep neural network; the real-time scheduling model training process based on the deep neural network is as follows:
system topology information and generating capacity data at different moments are input as a real-time scheduling model, the minimum cost of coal resource consumption and environmental pollution of a traditional thermal power generating unit, standby of a wind generating unit and the like is considered as an optimization target, and corresponding scheduling decisions and cost are calculated and serve as output of the real-time scheduling model;
wherein, the optimization objective function can be expressed as:
in the formula (1)Represents the electricity purchasing cost and C of the thermal generator setEFIs defined as the environmental pollution cost of the thermal generator set,Representing the electricity purchasing cost and C of the wind generating setWRRepresenting the standby cost of the wind power generator set; wherein n isGIndicates the number of thermal power generation groups in the system, nWRepresenting the number of wind power generation groups in the system.
Wherein, the electricity purchasing cost of the thermal generator set in the formula (1)Can be expressed as:
in the formula, ai、bi、ciRepresenting a characteristic coefficient of cost, P, of the thermal power generating unitGiThe power generation amount of the ith thermal power generator;
environmental pollution cost C of medium-sized thermal generator set in formula (1)EFCan be expressed as:
in the formula, muiTo representα cost coefficient of environmental pollution of thermal generator seti、βi、χi、i、iConverting the pollutants discharged in unit time of each unit into discharged nitride weight expression for the environmental pollution characteristic index of the ith thermal generator set;
in the formula, ηWjRepresenting the cost coefficient of the wind generating set, ten thousand yuan/pu; pWjThe actual power generation amount of the jth wind generating set;
in formula (1), the standby cost C of the wind power electric generating setWRCan be expressed as:
in the formula, PWPjIndicating the planned power generation of the jth wind turbine generator system, ξWjRepresenting a wind power generation standby cost coefficient, ten thousand yuan/pu, and ξWjThe relationship with the amount of electricity generation is expressed as:
the system constraints are:
in the formula:the initial output of the generator node is characterized,characterizing the initial load of a node, Gij、BijRespectively representing the real part and the imaginary part of corresponding elements in the admittance matrix; u shapei、UjRepresenting the voltage amplitudes, theta, of nodes i, j, respectivelyij=θi-θjRepresenting the voltage angle difference between the node i and the node j, i and j are the first end node and the tail end node of the line where the tangent point needs to be adjusted, iU、 iθrespectively representing the voltage amplitude value and the upper limit value and the lower limit value of the phase angle of the node i; ijPrespectively representing the upper limit value and the lower limit value of the power of the lines i-j; GiP、 GiQ、respectively representing the upper limit and the lower limit of active power output and reactive power output of a generator node;
designing a deep neural network model activation function: the activation function of the last layer of the deep neural network is designed to be linear, the activation functions of the feedforward transfer functions of other layers are designed to be ReLU activation functions, and then the form of the feedforward transfer function can be expressed as follows:
wherein l represents the number of layers of the deep neural network, n is the total number of layers of the deep neural network,is the transfer function of the l-th layer, xl-1For the input of the l layer, theta is an optimized parameter in the calculation process of the deep neural network, and W islAnd blA weight matrix and an offset vector between the l layer and the l-1 layer are obtained;
improving initialization parameters of the deep neural network model:
design of forward propagation initialization:
the activation function for top-layer forward propagation is as follows:
zi=wiyi+bi,yi=Ri(zi-1) (7)
suppose yi、ziAre independent of each other, provided with wi-1A symmetrical distribution around 0, bi-1=0,zi-1Has a mean value of zero and has a symmetrical distribution; due to yiIs derived from the ReLU function, then:
the sufficient conditions for the above formula to initialize correctly are:
thus, it follows:
and (3) reverse propagation initialization design:
for the back propagation process, the corresponding partial derivatives are:
in the formula, superscript T represents matrix transposition; same forward propagation, assuming R'Independently of each other, considering that the gradient is not a sufficient condition for being exponentially large or small, there are:
w is aligned and propagated in opposite directions by the formulas (10) and (12)iThe variance is obtained, and the balance needs to be obtained:
then, the weight parameter w of the deep neural network is initialized to zero mean gaussian distribution, the standard deviation thereof is only required to solve the square root of the formula (13), and the deviation b is initialized to 0;
completing the offline training of the deep neural network model by using the confirmed input data, output data, activation function and initial data;
step 3, obtaining a real-time scheduling strategy according to the calculation result of the deep neural network model:
and during on-line calculation, substituting the real-time data into the trained real-time scheduling model to obtain the scheduling plan at the current moment and corresponding cost.
Step 4, judging whether the scheduling result meets all constraint requirements of the system: if the current time is in line with the preset time, outputting a scheduling plan and corresponding cost; if not, returning to the recalculation.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the modifications or substitutions within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention should be subject to the protection scope of the claims.
Claims (1)
1. A wind power-containing electric power system real-time scheduling model based on deep learning is characterized by comprising the following steps:
step 1, obtaining the generated energy of a wind generating set and a thermal generating set at the current moment according to a system topological structure;
step 2, substituting the data of the wind generating set and the thermal generating set at the current moment into the trained real-time scheduling model based on the deep neural network; the real-time scheduling model training process based on the deep neural network is as follows:
system topology information and generating capacity data at different moments are input as a real-time scheduling model, the minimum cost of coal resource consumption and environmental pollution of a traditional thermal power generating unit, standby of a wind generating unit and the like is considered as an optimization target, and corresponding scheduling decisions and cost are calculated and serve as output of the real-time scheduling model;
wherein, the optimization objective function can be expressed as:
in the formula (1)Represents the electricity purchasing cost and C of the thermal generator setEFIs defined as the environmental pollution cost of the thermal generator set,Representing the electricity purchasing cost and C of the wind generating setWRRepresenting the standby cost of the wind power generator set; wherein n isGIndicates the number of thermal power generation groups in the system, nWRepresenting the number of wind power generation groups in the system;
the system constraints are:
in the formula:the initial output of the generator node is characterized,characterizing the initial load of a node, Gij、BijRespectively representing the real part and the imaginary part of corresponding elements in the admittance matrix; u shapei、UjRepresenting the voltage amplitudes, theta, of nodes i, j, respectivelyij=θi-θjRepresenting the voltage angle difference between the node i and the node j, i and j are the first end node and the tail end node of the line where the tangent point needs to be adjusted, iU、 iθrespectively representing the voltage amplitude value and the upper limit value and the lower limit value of the phase angle of the node i; ijPrespectively representing the upper limit value and the lower limit value of the power of the lines i-j; GiP、 GiQ、respectively representing the upper limit and the lower limit of active power output and reactive power output of a generator node;
designing a deep neural network model activation function: the activation function of the last layer of the deep neural network is designed to be linear, the activation functions of the feedforward transfer functions of other layers are designed to be ReLU activation functions, and then the form of the feedforward transfer function can be expressed as follows:
wherein l represents the number of layers of the deep neural network, n is the total number of layers of the deep neural network,is the transfer function of the l-th layer, xl-1For the input of the l layer, theta is an optimized parameter in the calculation process of the deep neural network, and W islAnd blA weight matrix and an offset vector between the l layer and the l-1 layer are obtained;
improving initialization parameters of the deep neural network model:
design of forward propagation initialization:
the activation function for top-layer forward propagation is as follows:
zi=wiyi+bi,yi=Ri(zi-1) (7)
suppose yi、ziAre independent of each other, provided with wi-1A symmetrical distribution around 0, bi-1=0,zi-1Has a mean value of zero and has a symmetrical distribution; due to yiIs derived from the ReLU function, then:
the sufficient conditions for the above formula to initialize correctly are:
thus, it follows:
and (3) reverse propagation initialization design:
for the back propagation process, the corresponding partial derivatives are:
in the formula, superscript T represents matrix transposition; same forward propagation, assuming R'Independently of each other, considering that the gradient is not a sufficient condition for being exponentially large or small, there are:
w is aligned and propagated in opposite directions by the formulas (10) and (12)iThe variance is obtained, and the balance needs to be obtained:
then, the weight parameter w of the deep neural network is initialized to zero mean gaussian distribution, the standard deviation thereof is only required to solve the square root of the formula (13), and the deviation b is initialized to 0;
completing the offline training of the deep neural network model by using the confirmed input data, output data, activation function and initial data;
step 3, obtaining a real-time scheduling strategy according to the calculation result of the deep neural network model:
and during on-line calculation, substituting the real-time data into the trained real-time scheduling model to obtain the scheduling plan at the current moment and corresponding cost.
Step 4, judging whether the scheduling result meets all constraint requirements of the system: if the current time is in line with the preset time, outputting a scheduling plan and corresponding cost; if not, returning to the recalculation.
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CN109241630A (en) * | 2018-09-11 | 2019-01-18 | 国网河北能源技术服务有限公司 | The method for optimizing scheduling and device of electric system |
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