CN110570080B - Startup control method, device and system for enterprise self-contained power grid - Google Patents
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Abstract
The invention discloses a method, a device and a system for controlling the starting of an enterprise self-contained power grid, and relates to the technical field of dispatching and running of a small power grid power system. The method comprises the following steps: acquiring power grid parameter information of each preset starting scheme; respectively calculating an economic index, a stability control index and a post-accident power supply recovery cost index corresponding to each preset starting scheme based on the acquired power grid parameters; then carrying out comprehensive evaluation calculation on each starting scheme according to a preset comprehensive evaluation rule; then selecting a starting scheme with an optimal comprehensive evaluation calculation result as an optimal starting scheme; and finally executing a starting control flow according to the optimal starting scheme. According to the invention, a proper starting scheme is determined by comprehensively considering economic benefits, safe and stable operation, power supply recovery after an accident and the like, so that the economy, safety and stability and power supply reliability of the enterprise self-contained power grid can be ensured.
Description
Technical Field
The invention relates to the technical field of dispatching and operation of a power system of a small-sized power grid, in particular to a method, a device and a system for controlling the startup of an enterprise self-contained power grid.
Background
In recent years, some factory and mine enterprises in China have a large-unit, large-load and small-system enterprise self-contained power grid structure in the development process, and generally are self-contained power grids of high-energy-consumption enterprises such as metallurgy, refining and the like. Compared with a large-scale power system, the enterprise self-contained power grid has the characteristics of small power grid capacity, weak structure, poor system stability, poor disturbance resistance of the system, multiple black start times and the like. Under various fault conditions, the system frequency is easy to fluctuate greatly, even serious consequences such as complete blackness of a power grid occur, and serious economic loss is brought to enterprises.
At present, the optimized operation scheduling of the enterprise self-contained power grid is still in a starting stage, and the starting mode is arranged mainly by the experience of workers. However, the power-on mode set according to experience often cannot adapt to the continuously changing power generation and load requirements during actual execution, and cannot guarantee the safe and stable operation of the system and also give consideration to the economy and the power restoration after an accident.
Disclosure of Invention
The invention aims to provide a method, a device and a system for controlling the startup of an enterprise self-contained power grid, which are used for determining a proper startup scheme from multiple comprehensive considerations such as economic benefit, safe and stable operation, power restoration after an accident and the like, and ensuring the economy, safety and stability and power supply reliability of the enterprise self-contained power grid.
The technical scheme adopted by the invention is as follows: a startup control method for an enterprise self-contained power grid comprises the following steps:
acquiring power grid parameter information of each preset starting scheme;
respectively calculating an economic index, a stability control index and a post-accident power supply recovery cost index corresponding to each preset starting scheme based on the acquired power grid parameters;
according to a preset comprehensive evaluation rule, carrying out comprehensive evaluation calculation on each starting scheme based on the calculated economic index, stability control index and post-accident power supply recovery cost index of each preset starting scheme;
selecting a starting scheme with an optimal comprehensive evaluation calculation result as an optimal starting scheme;
and executing a startup control flow according to the optimal startup scheme.
Preferably, based on the acquired power grid parameter information, the economic index of any startup scheme is as follows:
wherein G is a set of units operating in a startup scheme, P j Output of the jth unit, mu j Is the unit power generation cost of the jth unit.
Preferably, the calculating the stability control index of any startup scheme includes:
modeling the power grid system according to the power grid parameter information of the corresponding starting scheme;
observing the disturbed track of the system after each corresponding fault occurs by time domain simulation by utilizing a preset fault set;
selecting a fault set needing to apply control measures according to a disturbed track of the system;
calculating the stable control indexes of the corresponding starting-up scheme according to the fault set needing to apply the control measures as follows:
in the above formula, T is the fault set to be controlled under the corresponding boot-up scheme, k i Is the ith fault occurrence probability in the fault set, lambda i The control cost corresponding to the control measure required for the fault,
m is the number of units removed in the corresponding control measure, delta j To remove the control cost of the jth unit, tau, P L The control cost of unit load loss and the load amount lost by the system under corresponding control measures are respectively.
Preferably, based on the acquired power grid parameter information, the post-accident power supply restoration cost index of any startup scheme is as follows:
wherein L and G are respectively the set of the load losing power supply after accident and the off-line unit, L j 、t j The cost and the power failure duration of the jth load unit are respectively; cgr is i The cost required to restart for the ith off-net group.
Preferably, the comprehensive evaluation and calculation of each starting-up scheme includes:
respectively carrying out three-dimensional grading on the economy, the stability control performance and the post-accident power supply recovery cost of each starting scheme according to a preset grading rule;
based on the three-dimensional scoring result, calculating the comprehensive evaluation score of each starting scheme as follows:
S＝Q 1 *C 1 +Q 2 *C 2 +Q 3 *C 3
in the formula, Q 1 、Q 2 、Q 3 Respectively representing grading results of three dimensions of economy, stable control and power supply recovery cost after accident of the starting scheme, C 1 、C 2 、C 3 Are respectively preset startingThe scheme has evaluation weights of three dimensions of economy, stable controllability and power supply recovery cost after an accident.
Under the comprehensive evaluation rule, the comprehensive evaluation result is optimal, namely the comprehensive evaluation score is highest.
Preferably, the preset grading and scoring rule is as follows: if N starting-up schemes are provided, the corresponding index scores of the corresponding starting-up schemes are decreased from N to 1 according to the arrangement sequence of the index calculation values from the optimal value to the worst value. The grading score is mainly used for distinguishing the degree of merit of the index values, so that the scores can be adjusted to be decreased or increased progressively and the scores can be further adjusted.
Specifically, for the economic index of the starting-up scheme, the smaller the calculated Ne is, i.e. the better the economic efficiency is, the higher the score is; for the stability control index, the smaller the calculated Ns is, namely the better the stability control performance is, the higher the score is; for the power supply recovery cost index after the accident, the smaller the Nr obtained by calculation, the higher the score.
On the other hand, the invention also discloses a starting control device of the enterprise self-contained power grid, which comprises the following components:
the power grid parameter acquisition module is used for acquiring power grid parameter information of each preset starting scheme;
the index calculation module is used for calculating an economic index, a stability control index and a post-accident power supply recovery cost index corresponding to each preset starting scheme respectively based on the acquired power grid parameters;
the comprehensive evaluation module is used for carrying out comprehensive evaluation calculation on each starting scheme based on the calculated economic index, stability control index and post-accident power supply recovery cost index of each preset starting scheme according to a preset comprehensive evaluation rule;
the optimal scheme selection module is used for selecting a starting scheme with an optimal comprehensive evaluation calculation result as an optimal starting scheme;
and the starting control execution module is used for executing the starting control flow according to the optimal starting scheme.
In a third aspect, the present invention further discloses a system for controlling the power-on of an enterprise self-contained power grid, which includes a network interface, a memory and a processor, wherein:
the network interface is used for receiving and sending signals in the process of sending and receiving information with other external network elements;
a memory for storing computer program instructions executable on the processor;
and the processor is used for executing the steps of the starting control method of the enterprise self-contained power grid when the computer program instructions are run.
Advantageous effects
Compared with the prior art, the invention has the following advantages and progresses:
1) When the starting scheme is selected, the economic benefit and the safe and stable operation factors in the conventional sense are considered, and the power supply recovery after the accident is also considered, so that the method is more in line with the actual situation of the self-contained power grid of an enterprise;
2) The evaluation factor weight can be determined by operation scheduling personnel according to the actual condition of the enterprise self-contained power grid, and guidance suggestions with higher pertinence and practicability can be provided for the operation scheduling personnel of the enterprise self-contained power grid.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The following further description is made in conjunction with the accompanying drawings and the specific embodiments.
Example 1
The embodiment is a method for controlling the startup of an enterprise self-contained power grid, referring to fig. 1, and includes:
acquiring power grid parameter information of each preset starting scheme;
respectively calculating an economic index, a stability control index and a post-accident power supply recovery cost index corresponding to each preset starting scheme based on the acquired power grid parameters;
according to a preset comprehensive evaluation rule, performing comprehensive evaluation calculation on each starting scheme based on the calculated economic index, stability control index and post-accident power supply recovery cost index of each preset starting scheme;
selecting a starting scheme with an optimal comprehensive evaluation calculation result as an optimal starting scheme;
and executing a starting control flow according to the optimal starting scheme.
Examples 1 to 1
Based on the method of example 1, in this example:
based on the acquired power grid parameter information, the economic indexes of any starting scheme are as follows:
wherein G is the set of units operating in the start-up scheme, P j Output of the jth unit, mu j Is the unit power generation cost of the jth unit.
Calculating the stability control index of any starting scheme comprises the following steps:
modeling the power grid system according to the power grid parameter information of the corresponding starting scheme;
observing the disturbed track of the system after each corresponding fault occurs by time domain simulation by utilizing a preset fault set;
selecting a fault set needing to apply control measures according to a disturbed track of the system;
calculating the stable control indexes of the corresponding starting scheme according to the fault set needing to apply the control measures as follows:
in the above formula, T is the fault set to be controlled under the corresponding boot-up scheme, k i Is the ith fault occurrence probability in the fault set, lambda i The control cost corresponding to the control measure required for the fault,
m is the number of units removed in the corresponding control measure, delta j To remove the control cost of the jth unit, τ, P L The control cost of unit load loss and the load amount lost by the system under corresponding control measures are respectively.
Based on the acquired power grid parameter information, the post-accident power supply restoration cost index of any startup scheme is as follows:
in the formula, L and G are respectively the set of the load losing power supply after accident and the off-line unit, L j 、t j The cost and the power failure duration of the jth load unit are respectively; cgr is i The cost required to restart for the ith off-line group.
The comprehensive evaluation calculation of each starting scheme comprises the following steps:
carrying out three-dimensional grading on the economy, the stability control performance and the post-accident power supply recovery cost of each starting scheme according to a preset grading rule;
the preset grading and scoring rule is as follows: if N starting-up schemes are provided, according to the arrangement sequence of the index calculation values from the optimal to the worst, the corresponding index scores of the corresponding starting-up schemes are decreased from N scores to 1 score; for the economic index of the starting scheme, the calculated Ne is smaller, namely the economic index is better, and the score is higher; for the stability control index, the smaller the calculated Ns is, namely the better the stability control performance is, the higher the score is; for the power supply recovery cost index after the accident, the smaller Nr is obtained by calculation, the higher the score is;
based on the three-dimensional scoring result, calculating the comprehensive evaluation score of each starting scheme as follows:
S＝Q 1 *C 1 +Q 2 *C 2 +Q 3 *C 3
in the formula, Q 1 、Q 2 、Q 3 Respectively representing grading results of three dimensions of economy, stable control and power supply recovery cost after accident of the starting scheme, C 1 、C 2 、C 3 Respectively a preset starting-up scheme with economic efficiency and stable controllabilityAnd evaluation weights of three dimensions of power supply recovery cost after an accident.
In a specific application, the present embodiment involves the following steps:
s1, endowing each dimension evaluation factor weight C of each startup scheme according to the actual condition of the enterprise self-contained power grid 1 、C 2 、C 3 The higher the requirement of the self-contained power grid of the enterprise on a certain dimension evaluation factor is, the larger the weight value occupied by the factor is; and the weight sum of three dimensional evaluation factors of the same starting scheme is 1, namely C 1 +C 2 +C 3 ＝1。
S2, sequentially carrying out three-dimensional index calculation, grading and comprehensive grading on each starting-up scheme by using the method, wherein the comprehensive evaluation score of the ith starting-up scheme is as follows:
S i ＝Q 1 *C 1 +Q 2 *C 2 +Q 3 *C 3
in the formula, S i Represents the overall rating score, Q, of the ith turn-on scenario 1 、Q 2 、Q 3 And respectively representing scores of three dimensional evaluation factors of the ith starting scheme for economic benefit, safe and stable operation and power restoration after an accident.
Example 2
Based on the same inventive concept as embodiment 1, this embodiment is an enterprise self-contained power grid startup control device, including:
the power grid parameter acquisition module is used for acquiring power grid parameter information of each preset starting scheme;
the index calculation module is used for calculating an economic index, a stability control index and a post-accident power supply recovery cost index corresponding to each preset starting scheme respectively based on the acquired power grid parameters;
the comprehensive evaluation module is used for carrying out comprehensive evaluation calculation on each starting scheme based on the calculated economic index, stability control index and post-accident power supply recovery cost index of each preset starting scheme according to a preset comprehensive evaluation rule;
the optimal scheme selection module is used for selecting a starting scheme with an optimal comprehensive evaluation calculation result as an optimal starting scheme;
and the starting control execution module is used for executing the starting control flow according to the optimal starting scheme.
Example 3
Based on the same inventive concept as that of the embodiments 1-2, the embodiment is an enterprise self-contained power grid startup control system, which includes a network interface, a memory and a processor, wherein:
the network interface is used for receiving and sending signals in the process of receiving and sending information with other external network elements;
a memory for storing computer program instructions executable on the processor;
and the processor is used for executing the steps of the enterprise self-contained power grid starting control method when the computer program instructions are run.
In conclusion, the invention determines a proper starting scheme by comprehensively considering a plurality of aspects of economic benefit, safe and stable operation, power supply recovery after an accident and the like, and can ensure the economy, the safety and stability and the power supply reliability of the self-contained power grid of the enterprise.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the particular illustrative embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof, which may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A startup control method for an enterprise self-contained power grid is characterized by comprising the following steps:
acquiring power grid parameter information of each preset starting scheme;
respectively calculating an economic index, a stability control index and a post-accident power supply recovery cost index corresponding to each preset starting scheme based on the acquired power grid parameters;
according to a preset comprehensive evaluation rule, carrying out comprehensive evaluation calculation on each starting scheme based on the calculated economic index, stability control index and post-accident power supply recovery cost index of each preset starting scheme;
selecting a starting scheme with an optimal comprehensive evaluation calculation result as an optimal starting scheme;
executing a startup control flow according to the optimal startup scheme;
wherein, calculating the stability control index of any starting scheme comprises:
modeling the power grid system according to the power grid parameter information of the corresponding starting scheme;
observing the disturbed track of the system after each corresponding fault occurs by time domain simulation by utilizing a preset fault set;
selecting a fault set needing to apply control measures according to a disturbed track of the system;
calculating the stable control indexes of the corresponding starting scheme according to the fault set needing to apply the control measures as follows:
in the above formula, T is the fault set to be controlled under the corresponding boot-up scheme, k i Is the ith fault occurrence probability in the fault set, lambda i The control cost corresponding to the control measure required for the ith fault,
m is the number of units removed in the corresponding control measure, delta j To remove the control cost of the jth unit, τ, P L Respectively controlling cost of unit load loss and load amount lost by the system under corresponding control measures;
based on the acquired power grid parameter information, the economic indexes of any starting scheme are as follows:
wherein G is a set of units operating in a startup scheme, P j Output of the jth unit, mu j The unit power generation cost of the jth unit;
based on the acquired power grid parameter information, the post-accident power supply restoration cost index of any startup scheme is as follows:
wherein L and G are respectively the set of the load losing power supply after accident and the off-line unit, L j 、t j The cost and the power failure duration of the jth load unit are respectively; cgr is i The cost required to restart the ith off-line group;
the comprehensive evaluation calculation of each starting scheme comprises the following steps:
carrying out three-dimensional grading on the economy, the stability control and the post-accident power supply recovery cost of each starting scheme according to a preset grading rule;
based on three-dimensional scoring results, calculating the comprehensive evaluation scores of all the starting-up schemes as follows:
S＝Q 1 *C 1 +Q 2 *C 2 +Q 3 *C 3
in the formula, Q 1 、Q 2 、Q 3 Respectively representing grading results of three dimensions of economy, stable control and power supply recovery cost after accident of the starting scheme, C 1 、C 2 、C 3 And the evaluation weights are respectively three dimensions of the economical efficiency, the stable control performance and the power supply recovery cost after the accident of the preset starting scheme.
2. The method of claim 1, wherein the predetermined grading rules are: if N starting-up schemes are provided, the corresponding index scores of the corresponding starting-up schemes are decreased from N to 1 according to the arrangement sequence of the index calculation values from the optimal value to the worst value.
3. An enterprise self-contained power grid start-up control device is characterized by comprising:
the power grid parameter acquisition module is used for acquiring power grid parameter information of each preset starting scheme;
the index calculation module is used for calculating an economic index, a stability control index and a post-accident power supply recovery cost index corresponding to each preset starting scheme respectively based on the acquired power grid parameters;
the comprehensive evaluation module is used for carrying out comprehensive evaluation calculation on each starting scheme based on the calculated economic index, stability control index and post-accident power supply recovery cost index of each preset starting scheme according to a preset comprehensive evaluation rule;
the optimal scheme selection module is used for selecting a starting scheme with an optimal comprehensive evaluation calculation result as an optimal starting scheme;
the starting control execution module is used for executing the starting control flow according to the optimal starting scheme;
wherein, calculating the stability control index of any starting scheme comprises:
modeling the power grid system according to the power grid parameter information of the corresponding starting scheme;
observing disturbed tracks of a system after each corresponding fault occurs through time domain simulation by utilizing a preset fault set;
selecting a fault set needing to apply control measures according to a disturbed track of the system;
calculating the stable control indexes of the corresponding starting-up scheme according to the fault set needing to apply the control measures as follows:
in the above formula, T is the fault set to be controlled under the corresponding boot-up scheme, k i Is the ith fault occurrence probability, lambda, in the fault set i The control cost corresponding to the control measure needed for the ith fault,
m is the number of units removed in the corresponding control measure, delta j To remove the control cost of the jth unit, τ, P L Respectively controlling cost of unit load loss and load amount lost by the system under corresponding control measures;
based on the acquired power grid parameter information, the economic indexes of any starting scheme are as follows:
wherein G is a set of units operating in a startup scheme, P j Output of the jth unit, mu j The unit power generation cost of the jth unit;
based on the acquired power grid parameter information, the post-accident power supply restoration cost index of any startup scheme is as follows:
wherein L and G are respectively the set of the load losing power supply after accident and the off-line unit, L j 、t j The cost and the power failure duration of the jth load unit are respectively; cgr i The cost required to restart the ith off-line group;
the comprehensive evaluation calculation of each starting-up scheme comprises the following steps:
carrying out three-dimensional grading on the economy, the stability control and the post-accident power supply recovery cost of each starting scheme according to a preset grading rule;
based on the three-dimensional scoring result, calculating the comprehensive evaluation score of each starting scheme as follows:
S＝Q 1 *C 1 +Q 2 *C 2 +Q 3 *C 3
in the formula, Q 1 、Q 2 、Q 3 Individual watchGrading result of three dimensions of economy, stable control and power supply recovery cost after accident in startup display scheme C 1 、C 2 、C 3 And the evaluation weights are respectively three dimensions of the economy, the stability control performance and the power supply recovery cost after an accident of the preset starting scheme.
4. An enterprise self-contained power grid starting control system is characterized by comprising a network interface, a memory and a processor, wherein:
the network interface is used for receiving and sending signals in the process of receiving and sending information with other external network elements;
a memory for storing computer program instructions executable on the processor;
the processor is configured to execute the steps of the enterprise-owned power grid startup control method according to claim 1 or 2 when executing the computer program instructions.
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| CN103440401A (en) * | 2013-07-31 | 2013-12-11 | 南京南瑞集团公司 | Risk quantitative assessment method for emergency control measure for improving power transmission capacity of power grid |
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