A comprehensive evaluation method and system for multi-dimensional supporting performance of supporting power supply

Abstract

The present invention discloses a comprehensive evaluation method and system for the multi-dimensional supporting performance of supporting power sources, which relates to the technical field of power systems, including: obtaining the power supporting performance, quantity supporting performance, regulation capacity supporting performance and safety supporting performance of supporting power source units in the planned year according to the technical and economic parameters of various supporting power source units; and comprehensively evaluating the multi-dimensional supporting performance of supporting power sources according to the comprehensive membership of various indicators under the supporting performance of various supporting power sources in various dimensions. The present invention can quantify the supporting performance of supporting power sources, and consider the impact of the evolution of medium- and long-term technological development, and is more suitable for the quantitative evaluation of the supporting performance of supporting power sources under the background of the development of new power systems, and at the same time provides research ideas for the performance of power source support in a diversified market.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a comprehensive evaluation method and system for multi-dimensional supporting performance of a supporting power source. Background Art

[0002] The low-carbon transformation of the power system faces the dual pressures of low carbon and supply guarantee. New energy has gradually become the main power supply, and supporting power sources such as coal power and nuclear power have become the guarantee and cornerstone for the safe operation of high-proportion new energy systems. The supporting performance of power systems with a high proportion of new energy is a new type of power attribute. The existing evaluation system for power generation systems cannot fully reflect these functions. It is urgent to establish a new comprehensive evaluation method for the functions of supporting power sources. In terms of quantitative evaluation of power system performance, it is currently focused on the capacity, power and start-stop time that can be provided. There is no multi-dimensional evaluation, which cannot reflect and quantitatively evaluate the multi-dimensional supporting performance of supporting power sources in high-proportion new energy power supply scenarios, especially in terms of regulation and safety. At the same time, technological innovation is driving the continuous generation of new power generation equipment or power energy production equipment with higher regulation and support performance, which also requires a set of methods for effectively evaluating the supporting performance of supporting power sources. Therefore, there is an urgent need for a comprehensive evaluation method for the multi-dimensional supporting performance of supporting power sources that takes into account the evolution of technological development, which can be applied to the medium- and long-term and multi-dimensional comprehensive quantitative supporting power performance. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a comprehensive evaluation technology for the multi-dimensional supporting performance of supporting power sources, aiming at four types of supporting power sources, namely coal-fired power, gas-fired power, nuclear power and energy storage, combining their technical and economic characteristics, to quantify the supporting performance in four dimensions of electricity, electricity, regulation and safety, and considering the development and evolution of power supply technology during the planning period, a method for multi-dimensional supporting performance of supporting power sources suitable for medium- and long-term comprehensive evaluation is proposed.

[0004] In order to achieve the above technical objectives, the present application provides a comprehensive evaluation method for the multi-dimensional supporting performance of a supporting power supply, comprising the following steps:

[0005] According to the technical and economic parameters of various supporting power units, obtain the supporting performance of the supporting power units in four dimensions, namely, power support performance, quantity support performance, regulation capacity support performance and safety support performance in the planning year;

[0006] According to the comprehensive membership of various indicators of various supporting power sources under the supporting performance in various dimensions, the multi-dimensional supporting performance of the supporting power source is comprehensively evaluated.

[0007] Preferably, in the process of obtaining the power support performance, the power support performance is obtained according to the maximum power that can be generated, wherein the maximum power that can be generated is obtained based on the rated capacity of the unit by obtaining the effective coefficient of the unit output in the early fault period, the effective coefficient of the unit output in the occasional fault period and the effective coefficient of the unit output in the consumption fault period.

[0008] Preferably, in the process of obtaining the power supply support performance, the power supply support performance is obtained based on the power generation, utilization hours and maximum power generation.

[0009] Preferably, in the process of obtaining the adjustment capability support performance, the adjustment capability support performance is obtained according to the maximum adjustable capacity range, the adjustment speed and the start-up time.

[0010] Preferably, in the process of obtaining the safety support performance, the safety support performance is obtained based on the inertia constant and the frequency regulation coefficient, wherein the inertia constant is obtained based on the kinetic energy of the generator rotor of the unit and the rated capacity of the unit; and the power-frequency static characteristic coefficient of the unit is obtained based on the power change of the unit's frequency regulation per unit time as the frequency regulation coefficient.

[0011] Preferably, in the process of comprehensively evaluating the multi-dimensional supporting performance of the supporting power supply, by obtaining the secondary evaluation matrix of the power support performance, the secondary evaluation matrix of the electricity support performance, the secondary evaluation matrix of the regulation capability support performance and the secondary evaluation matrix of the safety support performance, through weight allocation, a secondary comprehensive indicator evaluation matrix of the support performance is obtained, which is used to comprehensively evaluate the multi-dimensional supporting performance of the supporting power supply.

[0012] Preferably, in the process of comprehensively evaluating the multi-dimensional supporting performance of the supporting power supply, the first-level evaluation matrix of the supporting performance of the supporting power supply is obtained according to the weight distribution of the indicators of the second-level comprehensive indicator evaluation matrix of the supporting performance, and then the multi-dimensional supporting performance of the supporting power supply is comprehensively evaluated.

[0013] The present invention discloses a comprehensive evaluation system for the multi-dimensional supporting performance of a supporting power source, which is used to implement the above-mentioned comprehensive evaluation method for the multi-dimensional supporting performance of a supporting power source, including:

[0014] The supporting performance acquisition module is used to obtain the supporting performance of the supporting power source units in four dimensions, namely, power supporting performance, quantity supporting performance, regulation capacity supporting performance and safety supporting performance, within the planning year according to the technical and economic parameters of various supporting power source units;

[0015] The comprehensive evaluation module is used to comprehensively evaluate the multi-dimensional supporting performance of the supporting power supply according to the comprehensive membership of various indicators of various supporting power supplies under the supporting performance of various dimensions.

[0016] The present invention discloses the following technical effects:

[0017] According to the technical and economic parameters of supporting power sources such as coal-fired power, gas-fired power, nuclear power, pumped storage and new energy storage, the present invention proposes supporting performance indicators in four dimensions: electricity, electricity quantity, regulation and safety. Through the evaluation method of fuzzy membership function, the relative contribution of power sources in the power supporting performance dimension can be clearly quantified. The results are intuitive and operational, and can provide guidance for power scheduling and optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the method flow of the present invention. DETAILED DESCRIPTION

[0020] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0021] like Figure 1 As shown, the present invention provides a method for synthesizing the multi-dimensional supporting performance of a supporting power supply, comprising the following steps:

[0022] Step S1: Obtain technical and economic parameters of various supporting power units;

[0023] Step S2: Based on the technical and economic parameters of the supporting power generation units, describe the supporting performance in four dimensions: power support performance, quantity support performance, regulation capacity support performance, and safety support performance within the planned year;

[0024] Step S3: According to the fuzzy membership comprehensive evaluation method, the comprehensive membership of various indicators of various supporting power sources under the supporting performance of various dimensions is calculated.

[0025] In step S1, the technical and economic parameters of the supporting power source units are various technical and economic parameters of coal-fired power, gas-fired power, nuclear power, pumped storage and new energy storage units in each year of the power system planning period.

[0026] In step S2, the power support performance of the supporting power source includes a sub-index, and the specific expression is as follows:

[0027] The maximum power that can be generated is expressed as follows:

[0028] ,

[0029] In the formula, Indicates the maximum power that the unit can generate. ; Indicates the rated capacity of the unit. ; Indicates the effectiveness coefficient of the unit output during the early failure period; Indicates the effectiveness coefficient of the unit output during the occasional failure period; Indicates the effectiveness coefficient of the unit output during the wear and tear failure period; They represent coal-fired power, gas-fired power, nuclear power, pumped storage and new energy storage units respectively.

[0030] In step S2, the power support performance of the supporting power source includes three sub-indicators: power generation, utilization hours, and maximum power generation. The specific expression is as follows:

[0031] The expression of power generation of a certain type of power supply is as follows:

[0032] ,

[0033] In the formula, Indicates the power generation of the unit, ; Indicates the time period, ; Indicates the time step The power generation under .

[0034] The expression for the number of hours of use of a certain type of power supply is as follows:

[0035] ,

[0036] In the formula, Indicates the utilization hours of the unit. .

[0037] The maximum power generation capacity of a certain type of power supply is expressed as follows:

[0038] ,

[0039] In the formula, Indicates the amount of electricity that can be generated by stored coal. ; Indicates the amount of coal stored, tons; Indicates the calorific value of coal, ; Indicates the calorific value of standard coal, usually 7000 ; Indicates the efficiency of converting coal's thermal energy into electrical energy, %; Indicates the amount of electricity that can be generated by stored gas. ; Indicates the natural gas to coal conversion coefficient, %, which depends on the storage status of natural gas; Indicates the amount of electricity that can be generated by the remaining fuel. ; It indicates the remaining fuel core uranium loading, tons; It represents the energy released per kilogram of uranium fuel. ; It represents the efficiency of converting uranium's thermal energy into electrical energy, %; Indicates the amount of electricity that can be generated by the pumped storage unit. ; represents the generating head, ; Indicates the water consumption of the pumped storage unit. ; represents the density of water, ; represents the acceleration due to gravity, ; It represents the power conversion efficiency of the pumped storage unit, %; Indicates the amount of electricity that can be generated by the energy storage unit. ; Indicates the rated energy of the energy storage unit. ; , Indicates the maximum and minimum charging states, %.

[0040] In step S2, the adjustment capability support performance of the supporting power supply includes three sub-indicators: maximum adjustable capacity range, adjustment speed, and start-up time. The specific expression is as follows:

[0041] The maximum adjustable capacity range expression is as follows:

[0042] ,

[0043] In the formula, Indicates the maximum adjustable capacity range of coal-fired power, gas-fired power, nuclear power, pumped storage and new energy storage units. ; Indicates the minimum technical output of coal-fired power, gas-fired power, nuclear power, pumped storage and new energy storage units. .

[0044] The adjustment speed is generally expressed in terms of climbing speed, and the expression is as follows:

[0045] ,

[0046] In the formula, Indicates the maximum climbing speed of the unit. ; Indicates the maximum climbing power of the unit per unit time. ; Indicates the ratio of the maximum climbing power of the unit to the rated power per unit time; Take every minute, .

[0047] The unit start time expression is as follows:

[0048] ,

[0049] In the formula, Indicates the start time of the unit. .

[0050] In step S2, the safety support performance of the supporting power source includes two sub-indicators: inertia constant and frequency modulation coefficient. The specific expression is as follows:

[0051] The inertia constant expression is as follows:

[0052] ,

[0053] In the formula, represents the inertia constant of the unit, ; represents the kinetic energy of the generator rotor of the unit, ; represents the moment of inertia, ; represents the angular velocity, .

[0054] The power-frequency-static characteristic coefficient expression is as follows:

[0055] ,

[0056] In the formula, Indicates the unit's power-frequency static characteristic coefficient, ; It indicates the power change of the unit's frequency regulation per unit time. ; It indicates the ratio of the maximum frequency modulation power of the unit to the rated power per unit time; Take every minute, .

[0057] In step S3, the membership calculation comprises the following steps:

[0058] Step S31: Select an appropriate membership function according to the indicator type under the power support performance dimension:

[0059] Maximum power generation The membership function expression is as follows:

[0060] ;

[0061] Maximum power generation The membership matrix expression of is as follows:

[0062] ,

[0063] In the formula, Indicates the maximum power that can be generated by the unit's power support performance dimension indicator The membership function of Indicates the annual maximum load, .

[0064] The expression of the secondary evaluation matrix of power support performance is as follows:

[0065] ;

[0066] Step S32: Select a suitable membership function according to the indicator type under the power support performance dimension:

[0067] Power generation of a power source The membership function expression is as follows:

[0068] ,

[0069] In the formula, Indicates the annual power consumption of the load, .

[0070] Power generation of a power source The membership matrix expression of is as follows:

[0071] ;

[0072] Hours of use The membership function expression is as follows:

[0073] ,

[0074] ,

[0075] In the formula, Indicates the annual maximum load utilization hours of electricity. .

[0076] Hours of use The membership matrix expression of is as follows:

[0077] ;

[0078] Maximum power generation The membership function expression is as follows:

[0079] ;

[0080] Maximum power generation The membership matrix expression of is as follows:

[0081] ;

[0082] The expression of the secondary evaluation matrix of power support performance is as follows:

[0083] ;

[0084] Step S33: Select a suitable membership function according to the indicator type under the adjustment capability support performance dimension:

[0085] Maximum adjustable capacity range The membership function expression is as follows:

[0086] ,

[0087] In the formula, is the maximum net load peak-to-valley difference, , the net load is defined as the load power minus the wind and solar power output.

[0088] Maximum adjustable capacity range The membership matrix expression of is as follows:

[0089] ;

[0090] Climbing speed The membership function expression is as follows:

[0091] ,

[0092] In the formula, The minimum value of the net load power change per minute; It is the maximum value of the net load power change per minute.

[0093] Climbing speed The membership matrix expression of is as follows:

[0094] ;

[0095] Unit start time The membership function expression is as follows:

[0096] ,

[0097] In the formula, is the start-up time limit of the peak load unit, ; is the upper limit of peak load time, .

[0098] Unit start time The membership matrix expression of is as follows:

[0099] ;

[0100] The expression of the secondary evaluation matrix of the regulation capability support performance is as follows:

[0101] ;

[0102] Step S34: Select an appropriate membership function according to the indicator type under the security support performance dimension:

[0103] Inertia constant The membership function expression is as follows:

[0104] ,

[0105] ,

[0106] In the formula, represents the minimum inertia constant of the system, ; Indicates the maximum value of the system inertia requirement, ; represents the maximum disturbance power, ; Indicates the maximum allowable frequency change rate limit, ; Indicates the system rated frequency, ; Indicates the rated capacity of the system. .

[0107] Inertia constant The membership matrix expression of is as follows:

[0108] ;

[0109] Power frequency static characteristic coefficient The membership function expression is as follows:

[0110] ,

[0111] In the formula, is the load frequency regulation effect coefficient, .

[0112] Power frequency static characteristic coefficient The membership matrix expression of is as follows:

[0113] ;

[0114] The expression of the secondary evaluation matrix of safety support performance is as follows:

[0115] ;

[0116] Step S35: According to the weight distribution of the support performance secondary evaluation matrix indicators, the support performance secondary comprehensive indicator evaluation matrix expression is obtained as follows:

[0117] ,

[0118] ,

[0119] In the formula, They represent power, electricity, regulation capability, and safety support performance respectively; is the number of indicators under each dimension; hour, ;when hour, ;when hour, ;when hour, .Right now Each row represents the comprehensive membership of each supporting power source's power, electricity, regulation capability, and safety support performance, and each column represents the comprehensive membership of the four dimensions of coal-fired power, gas-fired power, nuclear power, pumped storage, and new energy storage.

[0120] Step S36: According to the weight distribution of the indicators of the secondary comprehensive evaluation matrix of supporting performance, the expression of the primary evaluation matrix of supporting performance of supporting power supply is obtained as follows:

[0121] ,

[0122] ,

[0123] In the formula, and It represents the weight distribution of various indicators and the secondary evaluation matrix under power, electricity, regulation capability, and safety support performance. , , , They represent the membership of power support performance, power support performance, regulation capacity support performance, and safety support performance respectively. , , , and Respectively represent the membership of each dimension of coal power, gas power, nuclear power, pumped storage and new energy storage. The greater the membership, the better the supporting performance.

[0124] Example: The planned new energy installed capacity penetration rate of a provincial power system is 111% (the penetration rate is equal to the installed capacity divided by the annual maximum load), the annual maximum load is 103.5 million kilowatts, and the annual load power consumption is 590 billion kilowatt-hours. Under the condition that the total installed capacity of power sources remains unchanged at 229.38 million kilowatts, the supporting performance evaluation results of supporting power sources under different supporting power structures in a certain planning year are compared and analyzed.

[0125] Option 1: 38 million kilowatts of coal-fired power (penetration rate 37%), 7 million kilowatts of gas-fired power, 29.56 million kilowatts of nuclear power (penetration rate 29%), 19.8 million kilowatts of pumped storage, and 8 million kilowatts of new energy storage.

[0126] ,

[0127] ,

[0128] Among them, the comprehensive supporting performance evaluations of coal-fired power, gas-fired power, nuclear power, pumped storage, and energy storage are 0.524, 0.259, 0.484, 0.425, and 0.358, respectively.

[0129] Option 2: Coal-fired power 18.05 million kilowatts (penetration rate 17%), gas-fired power 7 million kilowatts, nuclear power 49.51 million kilowatts (penetration rate 48%), pumped storage 19.8 million kilowatts, and new energy storage 8 million kilowatts.

[0130] ,

[0131] ,

[0132] Among them, the comprehensive supporting performance evaluations of coal-fired power, gas-fired power, nuclear power, pumped storage, and energy storage are 0.410, 0.263, 0.610, 0.423, and 0.354, respectively.

[0133] In both schemes, the support performance of coal-fired power regulation capacity is better than that of nuclear power; the power and quantity support performance of coal-fired power and nuclear power is affected by the change of power installed capacity, and the power and quantity support performance of nuclear power in Scheme 2 is better than that of coal-fired power; the safety support performance of coal-fired power and nuclear power is better than other supporting power sources in both schemes; pumped storage and new energy storage have fully exerted their regulatory support performance in both schemes. According to the comprehensive evaluation results, due to the changes in the installed capacity penetration rate of coal-fired power and nuclear power, the comprehensive support performance of coal-fired power is the best in Scheme 1, and the comprehensive support performance of nuclear power is the best in Scheme 2.

[0134] This plan proposes a comprehensive evaluation method for the multi-dimensional supporting performance of supporting power sources. By adjusting the technical and economic parameters of the supporting power sources, the supporting performance indicators in four dimensions of electricity, power, regulation, and safety are calculated respectively. The supporting performance is decomposed by calculating the comprehensive membership of the supporting performance of each dimension of various types of supporting power sources. According to the degree of technological development evolution in each planning year, the technical and economic parameters of the units are adjusted to obtain a supporting power performance evaluation model that takes into account the technological development evolution year by year during the planning period.

[0135] The present invention can quantify the supporting performance of supporting power sources and take into account the impact of medium- and long-term technological development and evolution. It is more suitable for quantitative evaluation of the supporting performance of supporting power sources in the context of new power system development, and provides research ideas for the performance of supporting power sources in diversified markets.

[0136] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0137] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0138] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A comprehensive evaluation method for the multi-dimensional supporting performance of a supporting power source, characterized in that: The following steps are involved: According to the technical and economic parameters of various supporting power supply units, obtain the power support performance, quantity support performance, regulation capacity support performance and safety support performance of the supporting power supply units in the planning year; According to the comprehensive membership of various indicators of various supporting power sources under the supporting performance of various dimensions, the multi-dimensional supporting performance of supporting power sources is comprehensively evaluated; In the process of obtaining the power support performance, the power support performance is obtained according to the maximum power that can be generated, wherein the maximum power that can be generated is obtained by obtaining the effective coefficient of the unit output during the early fault period, the effective coefficient of the unit output during the occasional fault period, and the effective coefficient of the unit output during the loss fault period based on the rated capacity of the unit; In the process of obtaining the power support performance, the power support performance is obtained according to the power generation, utilization hours and maximum power generation of the power source; In the process of obtaining the adjustment capacity support performance, the adjustment capacity support performance is obtained according to the maximum adjustable capacity range, the adjustment speed and the start-up time; In the process of obtaining the safety support performance, the safety support performance is obtained according to the inertia constant and the frequency modulation coefficient, wherein the inertia constant is obtained according to the generator rotor kinetic energy of the unit and the rated capacity of the unit; the power-frequency static characteristic coefficient of the unit is obtained according to the power change of the unit's frequency modulation adjustment per unit time, as the frequency modulation coefficient; In the process of comprehensively evaluating the multi-dimensional support performance of the supporting power source, by obtaining the secondary evaluation matrix of the power support performance, the secondary evaluation matrix of the electricity support performance, the secondary evaluation matrix of the regulation capability support performance and the secondary evaluation matrix of the safety support performance, and by weight allocation, a secondary comprehensive index evaluation matrix of the support performance is obtained, which is used to comprehensively evaluate the multi-dimensional support performance of the supporting power source; In the process of comprehensively evaluating the multi-dimensional supporting performance of the supporting power supply, the first-level evaluation matrix of the supporting performance of the supporting power supply is obtained according to the weight distribution of the indicators of the second-level comprehensive indicator evaluation matrix of the supporting performance, and then the multi-dimensional supporting performance of the supporting power supply is comprehensively evaluated.

2. A comprehensive evaluation system for the multi-dimensional supporting performance of a supporting power source, used to implement a comprehensive evaluation method for the multi-dimensional supporting performance of a supporting power source as claimed in claim 1, characterized in that: include: A supporting performance acquisition module is used to obtain the power support performance, quantity support performance, regulation capacity support performance and safety support performance of the supporting power supply units in the planned year according to the technical and economic parameters of various supporting power supply units; The comprehensive evaluation module is used to comprehensively evaluate the multi-dimensional supporting performance of the supporting power supply according to the comprehensive membership of various indicators of various supporting power supplies under the supporting performance of various dimensions.

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