Power regulation and control method and system for non-pressure diversion type small hydropower station to participate in operation of power distribution network

Abstract

The invention discloses a power regulation and control method and system for a non-pressure diversion type small hydropower station to participate in operation of a power distribution network, and relates to the field of electric power automation. Performing normalization processing on the regulation capability index evaluation analysis method to obtain a dimensionless conversion coefficient of related parameters; according to the dimensionless conversion coefficients, respectively constructing adjustment capability functions of the small hydropower stations in a wet water period and an insufficient water period; screening out the small hydropower station meeting the adjustment time requirement as a target small hydropower station according to the adjustment capability function; calculating the corresponding adjustment intensity when each target small hydropower station meets the adjustment time demand, wherein the priority of the target small hydropower stations with low adjustment intensity participating in the power regulation and control of the operation of the power distribution network is high; and calculating the output of the target small hydropower station after adjustment. The output regulation capability can be objectively and accurately evaluated, the number of parameters involved in evaluation indexes is reduced, and complexity is reduced.

Description

Technical Field

[0001] The present invention relates to the field of electric power automation, and more specifically, to a power control method and system for pressure-free water diversion type small hydropower participating in the operation of a distribution network. Background Art

[0002] Traditional small hydropower usually does not have the ability to adjust power, and is in a state of "generating as much power as the water". With the construction of new power systems, a large number of distributed source and load resources such as distributed photovoltaics and charging piles are connected to the medium and low voltage distribution network, which brings huge challenges to the flexible adjustment ability of the distribution network. In some areas with better transformation conditions, through the transformation of the hydraulic and electrical links of small hydropower stations, flexible control of small hydropower can be achieved within a certain range, thereby supporting the controllable operation of the distribution network.

[0003] For the pressure-free water diversion small hydropower stations with regulation capabilities after transformation, when they participate in the joint operation of the distribution network, the distribution network needs to master the real-time regulation capabilities of the small hydropower stations, and then use them to form a joint operation strategy for small hydropower and distribution network. The power generation and regulation capabilities of small hydropower are affected by factors such as installed capacity, water inflow, and reservoir capacity. In the past, the evaluation of the regulation capabilities of small hydropower was mainly to calculate the absolute values ​​of various indicators. This method has good adaptability in comparing the regulation capabilities of a certain small hydropower in different periods, but when comparing the regulation capabilities of multiple small hydropower stations at the same time, due to the large differences in basic parameters between different small hydropower stations, the distribution of the absolute values ​​of various indicators is significantly different, and it is difficult to conduct objective analysis at the same latitude. In addition, in the past, the power regulation control of small hydropower mainly considered the power regulation demand of the distribution network, but did not consider the relationship between the regulation amount of small hydropower and the normal output. If the difference between the two is large, it is not conducive to the rapid realization of the regulation target on the one hand, and on the other hand, it will also have an adverse application on the operating life of the small hydropower unit. In addition, in the past, power regulation of small hydropower was mainly targeted at certain fixed units. When the regulation object was multiple hydropower units, there was a lack of effective regulation target allocation methods, and the degree of reliance on manual experience was high, making it difficult to achieve the optimal overall regulation benefit.

[0004] Therefore, how to study and design a power control method and system for pressure-free water diversion small hydropower participating in the operation of distribution network that can overcome the above-mentioned defects is a problem that we urgently need to solve. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a power control method and system for pressure-free water diversion small hydropower participating in the operation of a distribution network, normalize the output regulation capability indicators of small hydropower in flood period and water shortage period, obtain the dimensionless conversion coefficients of relevant parameters, and construct the regulation capability functions of small hydropower in flood period and water shortage period respectively according to the dimensionless conversion coefficients. On the one hand, the output regulation capability can be objectively and accurately evaluated, and on the other hand, after normalization, the number of parameters involved in the evaluation index can be reduced, thereby reducing the complexity.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] In the first aspect, a power control method for a non-pressure diversion type small hydropower participating in the operation of a distribution network is provided, comprising the following steps:

[0008] Obtaining relevant parameters of small hydropower storage space, relevant parameters of small hydropower unit power generation and output of small hydropower before regulation;

[0009] According to the relevant parameters of small hydropower storage space and the relevant parameters of small hydropower unit power generation, the output regulation capacity indicators of small hydropower in flood and shortage periods are evaluated and analyzed;

[0010] The output regulation capacity index of small hydropower in the flood period and the shortage period is normalized to obtain the dimensionless conversion coefficient of relevant parameters.

[0011] According to the dimensionless conversion coefficient, the regulation capacity function of small hydropower in the flood period and the shortage period is constructed respectively;

[0012] According to the regulation capacity function, small hydropower stations that meet the regulation time requirements are selected as target small hydropower stations;

[0013] Calculate the regulation intensity of each target small hydropower station when meeting the regulation time requirement. The target small hydropower station with small regulation intensity has a higher priority in participating in the power regulation of the distribution network operation.

[0014] The output of the target small hydropower after adjustment is calculated by combining the regulation intensity of the target small hydropower and the output before adjustment.

[0015] Furthermore, the calculation expression of the dimensionless conversion coefficient is specifically:

[0016]

[0017] Where Q2 represents the inflow flow of the small hydropower storage space; k represents the first dimensionless conversion coefficient, and the value range is k>0; Q 1maxrepresents the maximum power generation flow of the small hydropower unit; Q1 represents the power generation flow of the small hydropower; α represents the second dimensionless conversion coefficient, and its value range is 0≤α≤1; V represents the maximum water storage capacity; T c Indicates the maximum power generation flow Q 1max The time required to fill the maximum water storage capacity V; V1 represents the water storage capacity; β represents the third dimensionless conversion coefficient, and its value range is 0≤β≤1; V2 represents the water storage capacity to be stored.

[0018] Furthermore, the expression of the adjustment capability function is specifically:

[0019]

[0020] Among them, T +max Indicates the maximum upward adjustment time for small hydropower to maintain power regulation; T -max Indicates the maximum down-regulation time for small hydropower to maintain power regulation.

[0021] Furthermore, the expression of the adjustment strength is specifically:

[0022]

[0023] Among them, λ represents the adjustment strength; γ represents the strength parameter.

[0024] Furthermore, if the target small hydropower station is in a water shortage period, the output calculation formula of the target small hydropower station after adjustment is specifically:

[0025]

[0026] in, represents the adjusted power of the i-th small hydropower station; P i It is represented by the output of the i-th small hydropower station before regulation; γ i Represents the regulation intensity of the i-th small hydropower station.

[0027] Furthermore, if the target small hydropower station is in the flood season, the output calculation formula of the target small hydropower station after the power of the participating distribution network is adjusted upward is specifically:

[0028]

[0029] in, represents the adjusted power of the i-th small hydropower station; P i It represents the output of the i-th small hydropower station before regulation; ΔP represents the overall power regulation demand of the distribution network. When ΔP is greater than zero, it means that the regional distribution network needs small hydropower to increase its output; when ΔP is less than zero, it means that the regional distribution network needs small hydropower to reduce its output; S irepresents the rated installed capacity of the i-th small hydropower station; m represents the number of small hydropower stations with upward regulation capabilities among the target small hydropower stations.

[0030] Furthermore, if the target small hydropower station is in a flood period, the output calculation formula of the target small hydropower station after the power of the participating distribution network is adjusted downward is specifically:

[0031]

[0032] in, represents the adjusted power of the i-th small hydropower station; P i It represents the output of the i-th small hydropower station before regulation; ΔP represents the overall power regulation demand of the distribution network. When ΔP is greater than zero, it means that the regional distribution network needs small hydropower to increase its output; when ΔP is less than zero, it means that the regional distribution network needs small hydropower to reduce its output; S i represents the rated installed capacity of the i-th small hydropower station; n represents the number of small hydropower stations with regulation capabilities in the regional distribution network.

[0033] In a second aspect, a power control system for pressure-free water diversion small hydropower participating in the operation of a distribution network is provided, and the system is used to implement the power control method for pressure-free water diversion small hydropower participating in the operation of a distribution network as described in any one of the first aspects, including:

[0034] A parameter acquisition module is used to obtain parameters related to the water storage space of small hydropower stations, parameters related to the power generation of small hydropower units, and the output of small hydropower stations before regulation;

[0035] The index evaluation module is used to evaluate and analyze the output regulation capacity index of small hydropower in the flood period and the water shortage period according to the relevant parameters of the small hydropower water storage space and the relevant parameters of the small hydropower unit power generation;

[0036] The conversion processing module is used to normalize the output regulation capability index of small hydropower in the flood period and the shortage period to obtain the dimensionless conversion coefficient of the relevant parameters;

[0037] Function construction module, used to construct the regulation capacity function of small hydropower in the flood period and the shortage period according to the dimensionless conversion coefficient;

[0038] A target screening module, used to screen out small hydropower plants that meet the regulation time requirements as target small hydropower plants according to the regulation capacity function;

[0039] The intensity calculation module is used to calculate the regulation intensity corresponding to each target small hydropower station when the regulation time requirement is met. The target small hydropower station with small regulation intensity has a high priority in participating in the power regulation of the distribution network operation;

[0040] The power calculation module is used to calculate the adjusted output of the target small hydropower by combining the regulation intensity of the target small hydropower and the output before regulation.

[0041] In a third aspect, a computer terminal is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a power control method for a small hydropower station without pressure diversion participating in the operation of a distribution network is implemented as described in any one of the first aspects.

[0042] In a fourth aspect, a computer-readable medium is provided, on which a computer program is stored, and the computer program is executed by a processor to implement a power control method for a non-pressure diversion small hydropower station participating in the operation of a distribution network as described in any one of the first aspects.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The power control method for pressure-free water diversion small hydropower participating in the operation of the distribution network provided by the present invention normalizes the output regulation capability index of the small hydropower in the flood period and the water shortage period to obtain the dimensionless conversion coefficient of the relevant parameters, and constructs the regulation capability function of the small hydropower in the flood period and the water shortage period respectively according to the dimensionless conversion coefficient. On the one hand, the output regulation capability can be objectively and accurately evaluated, and on the other hand, the normalization process can reduce the number of parameters involved in the evaluation index and reduce the complexity;

[0045] 2. The present invention considers the relationship between the small hydropower regulation amount and the normal output to calculate the regulation intensity of each small hydropower, which can clarify the priority of multiple small hydropower units involved in the regulation, realize the rapid selection of the regulation target, and is conducive to extending the operating life of the small hydropower units;

[0046] 3. When the regulation object of the present invention is multiple hydropower units, the power of small hydropower participating in the power distribution network upward and downward regulation can be reasonably allocated according to the intensity parameters that determine the regulation intensity during the water shortage period and the water flood period, so as to optimize the overall regulation benefit. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0048] Figure 1 is a flow chart of Embodiment 1 of the present invention;

[0049] Figure 2 It is a system block diagram in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0051] Embodiment 1: A power control method for small hydropower plants without pressure diversion participating in the operation of a distribution network, such as Figure 1 As shown, the following steps are included:

[0052] S1: Obtain the relevant parameters of the small hydropower storage space, the relevant parameters of the small hydropower unit power generation, and the output of the small hydropower before regulation;

[0053] S2: Evaluate and analyze the output regulation capability of small hydropower in flood and water shortage periods based on the relevant parameters of small hydropower storage space and the relevant parameters of small hydropower unit power generation;

[0054] S3: Normalize the output regulation capability index of small hydropower in the flood period and the shortage period to obtain the dimensionless conversion coefficient of relevant parameters;

[0055] S4: According to the dimensionless conversion coefficient, the regulation capacity function of small hydropower in the flood period and the shortage period is constructed respectively;

[0056] S5: select small hydropower plants that meet the regulation time requirements as target small hydropower plants according to the regulation capacity function;

[0057] S6: Calculate the regulation intensity corresponding to each target small hydropower station when the regulation time requirement is met, and the target small hydropower station with small regulation intensity has a higher priority in participating in the power regulation of the distribution network operation;

[0058] S7: Calculate the output of the target small hydropower station after adjustment by combining the adjustment intensity of the target small hydropower station and the output before adjustment.

[0059] In step S1, the water storage space of the small hydropower station includes the fore pond, water diversion channel, reservoir and other links with water storage capacity. The parameters to be obtained include the maximum water storage capacity V (the amount of water for power generation that can be stored in all the water storage spaces of the small hydropower station, unit: cubic meter), the stored water capacity V1 (the amount of water stored in the water storage space of the small hydropower station at a certain adjustment capacity calculation time t, unit: cubic meter), and the amount of water to be stored V2 (the remaining water storage capacity in the water storage space of the small hydropower station at a certain adjustment capacity calculation time t, unit: cubic meter). The relationship between the three is as follows: V = V1 + V2.

[0060] The inflow flow into the small hydropower storage space is Q2 (the amount of water flowing into the small hydropower storage space at time t, in cubic meters per second), and the power generation flow of the small hydropower is Q1 (the outflow flow from the small hydropower storage space at time t, that is, the flow used for power generation, in cubic meters per second).

[0061] Maximum power generation capacity of small hydropower unit P max , the corresponding power generation flow at this time is the maximum power generation flow Q 1max , the relationship between the two is as follows: max =g×Q 1max ×h×η; where g is the gravitational acceleration constant (unit: m / s 2 ), h is the water head height of the hydropower unit (unit: meter), and η is the power generation efficiency of the generator unit. For a certain small hydropower unit, h and η are fixed values.

[0062] In step S2, the present invention distinguishes between two stages, namely, the flood period and the dry period, and establishes a quantitative calculation relationship from the upward adjustment of output, the downward adjustment of output and their corresponding maximum adjustment time.

[0063] 1. Calculation of small hydropower regulation capacity during flood season

[0064] The flood season referred to in the present invention is when the flow rate Q2 of the small hydropower storage space is greater than the maximum power generation flow rate Q 1max , at this time Q1, Q 1max , Q2 are as follows: Q1≤Q 1max <Q2。

[0065] Since the inflow flow is greater than the maximum power generation flow, the small hydropower will be at the maximum water storage capacity, and the waiting water storage capacity is 0, that is: At this time, water will be discarded, and the discarded water flow rate Q a For: Q a =Q2-Q1.

[0066] (1) Calculation of small hydropower output regulation capacity during flood season

[0067] The upward adjustment capacity refers to the maximum output that can be increased and the sustainable output time at the new output level of the small hydropower unit when calculating the adjustment capacity. Maximum upward adjustment output range ΔP +max It can be expressed as: ΔP +max =P max -P1.

[0068] Since it is in the flood season, the small hydropower can maintain the maximum power generation capacity continuously, so the maximum continuous output time T is increased. +max After the output is increased, it is beneficial to reduce the abandoned water flow of small hydropower. At this time, the abandoned water flow Q a For: Q a =Q2-Q 1max .

[0069] (2) Calculation of regulation capacity of small hydropower during flood season

[0070] The down-regulation capacity refers to the maximum output that can be reduced and the sustainable output time at the new output level of the small hydropower unit when calculating the regulation capacity. -max It can be expressed as: ΔP -max =P1.

[0071] That is, in extreme cases, small hydropower can be shut down. The down-regulation capacity at this time is the power generation power P1 corresponding to the calculation time, and the down-regulation time T corresponding to this time is -max After the output is reduced, the abandoned water flow of small hydropower will increase. At this time, the abandoned water flow Q a For: Q a =Q2.

[0072] 2. Calculation of small hydropower regulation capacity during water shortage period

[0073] The water shortage period referred to in the present invention is when the inflow flow Q2 of the small hydropower storage space is less than the maximum power generation flow Q 1max In order to make full use of water resources to realize electric energy conversion during the water shortage period, when there is no output regulation demand, the power generation flow can be set to the inflow flow, that is: Q1 = Q2.

[0074] The power generation P at this time can be expressed as: P q =g×Q1×h×η. During the water shortage period, unless there is a special emergency, all output adjustments are based on the principle of not abandoning water.

[0075] (1) Calculation of small hydropower output regulation capacity during water shortage period

[0076] The power generation flow corresponding to the small hydropower output after the water shortage period is increased is Q1, which satisfies the following relationship: Q2 <Q1≤Q 1max .

[0077] The corresponding maximum adjustment time T +max It can be expressed as: If the increase time exceeds T +max , small hydropower will lose the ability to increase its output, and its output will return to the output that matches the inflow flow Q2 into the water storage space.

[0078] (2) Calculation of regulation capacity of small hydropower output during water shortage period

[0079] The power generation flow corresponding to the small hydropower output after the water shortage period is increased is Q1, which satisfies the following relationship: Q1 <Q2。

[0080] The corresponding maximum adjustment time T -max It can be expressed as:

[0081] In step S3, due to the differences in absolute values such as flow rate, reservoir capacity, and installed capacity among different small hydropower plants, in order to compare the regulation capabilities of different small hydropower plants on the same scale, the calculation method of the regulation capability of small hydropower plants is normalized.

[0082] Taking Q 1max as the reference, let:

[0083]

[0084] where k represents the first dimensionless conversion coefficient, and its value range is k > 0. When 0 < k < 1, the small hydropower plant is in the water shortage period; when k ≥ 1, the small hydropower plant is in the water-rich period; α represents the second dimensionless conversion coefficient, and its value range is 0 ≤ α ≤ 1; T c represents the time required to fill the maximum water storage volume V; β represents the third dimensionless conversion coefficient, and its value range is 0 ≤ β ≤ 1. 1max with the maximum power generation flow rate Q

[0085] In step S4, the regulation capability function expressions after normalizing the maximum upward and downward adjustment times in the water-rich and water shortage periods are:

[0086]

[0087] where T +max represents the maximum upward adjustment time for the small hydropower plant to maintain power regulation; T -max represents the maximum downward adjustment time for the small hydropower plant to maintain power regulation.

[0088] The evaluation calculation methods for the water-rich period and the water shortage period are unified and normalized, and the regulation capabilities of small hydropower units with different installed capacities and in different periods are calculated on the same scale.

[0089] In step S5, whether a small hydropower plant participates in the power regulation of the distribution network not only needs to consider the output of the small hydropower plant, but also needs to consider the duration of the continuous output of the small hydropower plant. Therefore, it is necessary to solve the time for each small hydropower plant to maintain power regulation through the regulation capability function, and select the small hydropower plants that meet the regulation time requirements as the target small hydropower plants.

[0090] In step S6, the calculation form of the regulation capability of small hydropower plants in the water-rich period is simple, but the calculation method in the water shortage period contains four variables, namely α, β, k, and T c In order to facilitate the calculation of the regulation capability of small hydropower plants in the water shortage period, the calculation parameters in the water shortage period are further integrated and optimized. Let:

[0091] Then the maximum upward and downward adjustment times in the water shortage period can be further simplified as:

[0092] The regulation intensity is defined as: |1-γ|. The larger the value, the greater the output regulation change of small hydropower, and the greater the impact on the normal power generation of small hydropower. +max and T -max The larger it is, the longer the small hydropower can maintain power regulation under a certain regulation intensity, and the longer the regulation time.

[0093] Therefore, the expression of the adjustment strength is: λ=|1-γ|, Among them, λ represents the adjustment strength; γ represents the strength parameter.

[0094] In step S7, small hydropower with regulation capability can be used to meet the regulation needs when the load or photovoltaic output changes. Based on the evaluation of the regulation capability of small hydropower in the previous step, the regulation participation of small hydropower in the distribution network operation is optimized and divided into two categories: insufficient water period and flood period. Assume that the number of small hydropower with regulation capability in the regional distribution network is n, and the rated installed capacity of each small hydropower is S i ,i∈[1,n]. Assume that the overall power regulation demand of the distribution network is ΔP. ​​When ΔP is greater than zero, it means that the regional distribution network needs small hydropower to increase its output. When ΔP is less than zero, it means that the regional distribution network needs small hydropower to reduce its output. The regulation time requirement is T t .

[0095] (1) Small hydropower participates in the upward regulation of distribution network power during the water shortage period

[0096] Calculate the time required for each small hydropower station to meet the regulation time T t The corresponding upward regulation intensity. The regulation intensity of each small hydropower station λ i It can be expressed as:

[0097]

[0098] Among them, γ i , β i , i are the γ, β, and ξ parameters corresponding to the i-th small hydropower station, and the λ corresponding to each small hydropower station is i Sort from small to large, and give priority to small hydropower with low regulation intensity.

[0099] The adjusted power of the i-th small hydropower station is It can be expressed as:

[0100]

[0101] Among them, P i To adjust the output of the i-th small hydropower station.

[0102] (2) During the water shortage period, small hydropower participates in the downward regulation of distribution network power.

[0103] Calculate the time required for each small hydropower station to meet the regulation time T t The corresponding downward regulation intensity at this time. i It can be expressed as:

[0104] The adjusted power of the i-th small hydropower station is It can be expressed as:

[0105] (3) Small hydropower participates in the upward regulation of distribution network power during flood season

[0106] Determine whether each small hydropower station is at its maximum power output. If a small hydropower station is already at its maximum output, it cannot participate in the upward power regulation. Assuming that m of the n small hydropower stations still have the ability to adjust upward, where m≤n, the upward adjustment output of the m small hydropower stations is allocated according to the proportion of installed capacity. The power that each small hydropower station needs to adjust is ΔP i ,i∈[1,m], where:

[0107]

[0108] The adjusted power of the i-th small hydropower station is It can be expressed as:

[0109] (4) During the flood season, small hydropower plants participate in the downward regulation of the power of the distribution network

[0110] This step requires allocating the overall power regulation demand of the regional distribution network to each small hydropower unit according to the proportion of the rated installed capacity of each unit. The power that each small hydropower unit needs to adjust is ΔP i ,i∈[1,n]. Among them:

[0111]

[0112] The adjusted power of the i-th small hydropower station is It can be expressed as:

[0113] Embodiment 2: A power control system for pressure-free water diversion small hydropower participating in the operation of a distribution network, the system is used to implement the power control method for pressure-free water diversion small hydropower participating in the operation of a distribution network as described in Embodiment 1, such as Figure 2 As shown, it includes a parameter acquisition module, an indicator evaluation module, a conversion processing module, a function construction module, a target screening module, an intensity calculation module and a power calculation module.

[0114] Among them, the parameter acquisition module is used to obtain the relevant parameters of the small hydropower storage space, the relevant parameters of the small hydropower unit power generation and the output of the small hydropower before regulation; the index evaluation module is used to evaluate and analyze the output regulation capacity indicators of the small hydropower in the flood period and the water shortage period according to the relevant parameters of the small hydropower storage space and the relevant parameters of the small hydropower unit power generation; the conversion processing module is used to normalize the output regulation capacity indicators of the small hydropower in the flood period and the water shortage period to obtain the dimensionless conversion coefficients of the relevant parameters; the function construction module is used to construct the regulation capacity functions of the small hydropower in the flood period and the water shortage period according to the dimensionless conversion coefficients; the target screening module is used to screen out the small hydropower that meets the regulation time requirements as the target small hydropower according to the regulation capacity function; the intensity calculation module is used to calculate the corresponding regulation intensity of each target small hydropower when the regulation time requirements are met, and the target small hydropower with a small regulation intensity has a high priority in participating in the power regulation of the distribution network operation; the power calculation module is used to calculate the adjusted output of the target small hydropower in combination with the regulation intensity of the target small hydropower and the output before regulation.

[0115] The present invention also records a computer terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the power control method for pressure-free water diversion small hydropower participating in the operation of a distribution network as described in Example 1 is implemented.

[0116] The present invention also records a computer-readable medium on which a computer program is stored. The computer program is executed by a processor to implement the power control method for pressure-free water diversion small hydropower participating in the operation of a distribution network as described in Example 1.

[0117] Working principle: The present invention normalizes the output regulation capability index of small hydropower in the flood period and the water shortage period to obtain the dimensionless conversion coefficient of the relevant parameters, and constructs the regulation capability function of small hydropower in the flood period and the water shortage period respectively according to the dimensionless conversion coefficient. On the one hand, the output regulation capability can be objectively and accurately evaluated, and on the other hand, the number of parameters involved in the evaluation index can be reduced after the normalization process, thereby reducing the complexity. In addition, the present invention considers the relationship between the small hydropower regulation amount and the normal output to calculate the regulation intensity of each small hydropower, and can clarify the priority of multiple small hydropower units involved in the regulation, realize the rapid selection of the regulation target, and is conducive to extending the operating life of the small hydropower units.

[0118] In addition, when the regulation object of the present invention is multiple hydropower units, the small hydropower can be reasonably allocated to participate in the upward and downward regulation of the power of the distribution network during the water shortage period and the water flood period according to the intensity parameters that determine the regulation intensity, so as to achieve the optimization of the overall regulation benefit.

[0119] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0120] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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.

[0121] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0123] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power control method for non-pressure diversion small hydropower participating in the operation of distribution network, characterized in that: The following steps are involved: Obtaining relevant parameters of small hydropower storage space, relevant parameters of small hydropower unit power generation and output of small hydropower before regulation; According to the relevant parameters of small hydropower storage space and the relevant parameters of small hydropower unit power generation, the output regulation capacity indicators of small hydropower in flood and shortage periods are evaluated and analyzed; The output regulation capacity index of small hydropower in the flood period and the shortage period is normalized to obtain the dimensionless conversion coefficient of relevant parameters. According to the dimensionless conversion coefficient, the regulation capacity function of small hydropower in the flood period and the shortage period is constructed respectively; According to the regulation capacity function, small hydropower stations that meet the regulation time requirements are selected as target small hydropower stations; Calculate the regulation intensity of each target small hydropower station when meeting the regulation time requirement. The target small hydropower station with small regulation intensity has a higher priority in participating in the power regulation of the distribution network operation. The output of the target small hydropower after adjustment is calculated by combining the regulation intensity of the target small hydropower and the output before adjustment.

2. The power control method for non-pressure diversion type small hydropower participating in the operation of the distribution network according to claim 1 is characterized in that: The calculation expression of the dimensionless conversion coefficient is specifically: Where Q2 represents the inflow flow of the small hydropower storage space; k represents the first dimensionless conversion coefficient, and the value range is k>0; Q 1max represents the maximum power generation flow of the small hydropower unit; Q1 represents the power generation flow of the small hydropower; α represents the second dimensionless conversion coefficient, and its value range is 0≤α≤1; V represents the maximum water storage capacity; T c Indicates the maximum power generation flow Q 1max The time required to fill the maximum water storage capacity V; V1 represents the water storage capacity; β represents the third dimensionless conversion coefficient, and its value range is 0≤β≤1; V2 represents the water storage capacity to be stored.

3. The power control method for non-pressure diversion type small hydropower participating in the operation of the distribution network according to claim 2 is characterized in that: The expression of the adjustment capability function is specifically: Among them, T +max Indicates the maximum upward adjustment time for small hydropower to maintain power regulation; T -max Indicates the maximum down-regulation time for small hydropower to maintain power regulation.

4. The power control method for non-pressure diversion type small hydropower participating in the operation of the distribution network according to claim 2 is characterized in that: The expression of the adjustment strength is specifically: Among them, λ represents the adjustment strength; γ represents the strength parameter.

5. The power control method for non-pressure diversion type small hydropower participating in the operation of distribution network according to claim 1 is characterized in that: If the target small hydropower station is in a water shortage period, the output calculation formula of the target small hydropower station after adjustment is specifically as follows: in, represents the adjusted power of the i-th small hydropower station; P i It is represented by the output of the i-th small hydropower station before regulation; γ i Represents the regulation intensity of the i-th small hydropower station.

6. The power control method for non-pressure diversion type small hydropower participating in the operation of distribution network according to claim 1 is characterized in that: If the target small hydropower station is in the flood season, the output calculation formula of the target small hydropower station after the power of the participating distribution network is adjusted upward is as follows: in, represents the adjusted power of the i-th small hydropower station; P i It represents the output of the i-th small hydropower station before regulation; ΔP represents the overall power regulation demand of the distribution network. When ΔP is greater than zero, it means that the regional distribution network needs small hydropower to increase its output; when ΔP is less than zero, it means that the regional distribution network needs small hydropower to reduce its output; S i represents the rated installed capacity of the i-th small hydropower station; m represents the number of small hydropower stations with upward regulation capabilities among the target small hydropower stations.

7. The power control method for non-pressure diversion type small hydropower participating in the operation of distribution network according to claim 1 is characterized in that: If the target small hydropower station is in the flood season, the output calculation formula of the target small hydropower station after the power of the participating distribution network is adjusted downward is as follows: in, represents the adjusted power of the i-th small hydropower station; P i It represents the output of the i-th small hydropower station before regulation; ΔP represents the overall power regulation demand of the distribution network. When ΔP is greater than zero, it means that the regional distribution network needs small hydropower to increase its output; when ΔP is less than zero, it means that the regional distribution network needs small hydropower to reduce its output; S i represents the rated installed capacity of the i-th small hydropower station; n represents the number of small hydropower stations with regulation capabilities in the regional distribution network.

8. The power control system of non-pressure diversion small hydropower participating in the operation of distribution network is characterized by: The system is used to implement the power control method for pressure-free water diversion small hydropower participating in the operation of the distribution network as described in any one of claims 1 to 7, comprising: A parameter acquisition module is used to obtain parameters related to the water storage space of small hydropower stations, parameters related to the power generation of small hydropower units, and the output of small hydropower stations before regulation; The index evaluation module is used to evaluate and analyze the output regulation capacity index of small hydropower in the flood period and the water shortage period according to the relevant parameters of the small hydropower water storage space and the relevant parameters of the small hydropower unit power generation; The conversion processing module is used to normalize the output regulation capability index of small hydropower in the flood period and the shortage period to obtain the dimensionless conversion coefficient of the relevant parameters; Function construction module, used to construct the regulation capacity function of small hydropower in the flood period and the shortage period according to the dimensionless conversion coefficient; A target screening module, used to screen out small hydropower plants that meet the regulation time requirements as target small hydropower plants according to the regulation capacity function; The intensity calculation module is used to calculate the regulation intensity corresponding to each target small hydropower station when the regulation time requirement is met. The target small hydropower station with small regulation intensity has a high priority in participating in the power regulation of the distribution network operation; The power calculation module is used to calculate the adjusted output of the target small hydropower by combining the regulation intensity of the target small hydropower and the output before regulation.

9. A computer terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the power regulation method for pressure-free water diversion small hydropower participating in the operation of the distribution network as described in any one of claims 1 to 7 is implemented.

10. A computer readable medium having a computer program stored thereon, characterized in that: The computer program is executed by a processor to implement the power control method for pressure-free water diversion small hydropower participating in the operation of the distribution network as described in any one of claims 1 to 7.

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