Power Regulation Method and System for Pressureless Diversion-type Small Hydropower Participating in the Operation of Distribution Network

Abstract

The present invention discloses a power regulation method and system for unpressurized diversion-type small hydropower to participate in the operation of the distribution network, which relates to the field of power automation. The key points of its technical solution are as follows: evaluating and analyzing the output regulation ability indexes of small hydropower in wet seasons and dry seasons; normalizing the evaluation and analysis method of the regulation ability indexes to obtain the dimensionless conversion coefficients of relevant parameters; respectively constructing the regulation ability functions of small hydropower in wet seasons and dry seasons according to the dimensionless conversion coefficients; screening out the small hydropower that meets the regulation time requirement as the target small hydropower according to the regulation ability function; calculating the regulation intensity corresponding to each target small hydropower when meeting the regulation time requirement, and the target small hydropower with a small regulation intensity has a higher priority to participate in the power regulation of the distribution network operation; calculating the adjusted output of the target small hydropower. The present invention can objectively and accurately evaluate the output regulation ability, while reducing the number of parameters involved in the evaluation indexes and lowering the complexity.

Description

Technical Field

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

[0002] Traditional small hydropower stations usually do not have the ability to regulate power and are in a state of "generating as much electricity as the water inflow". With the construction of a new power system, a large number of distributed source-load resources such as distributed photovoltaics and charging piles are connected to medium- and low-voltage distribution networks, posing a huge challenge to the flexible regulation 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 a non-pressure diversion small hydropower station with regulation ability after transformation, when it participates in the joint operation of the distribution network, the distribution network needs to master the real-time regulation ability of the small hydropower station, and then use it to form a joint operation strategy for the small hydropower and the distribution network. The power generation and regulation ability of small hydropower are comprehensively affected by factors such as installed capacity, water inflow, and reservoir capacity. In the past, the evaluation of the regulation ability of small hydropower mainly calculated the absolute values of various indicators. This method has good adaptability when comparing the regulation ability of a certain small hydropower at different times. However, when comparing the regulation abilities of multiple small hydropower stations, due to the large differences in basic parameters between different small hydropower stations and the significant differences in the distribution of absolute values of various indicators, it is difficult to conduct objective analysis on the same dimension. In addition, in the past, the power regulation control of small hydropower mainly considered the power regulation requirements of the distribution network, without considering the relationship between the regulation amount of small hydropower and its normal output. If the difference between the two is large, on the one hand, it is not conducive to the rapid realization of the regulation goal, and on the other hand, it will also have an adverse impact on the operation life of small hydropower units. In addition, in the past, the power regulation of small hydropower mainly targeted a certain fixed unit. When the regulation object is multiple hydropower units, there is a lack of an effective regulation target allocation method, and it is highly dependent on manual experience, making it difficult to achieve the optimal overall regulation benefit.

[0004] Therefore, how to research and design a power regulation method and system for a non-pressure diversion small hydropower station participating in the operation of a distribution network that can overcome the above defects is an urgent problem for us to solve at present. Summary of the Invention

[0005] To solve the deficiencies in the prior art, the object of the present invention is to provide a power regulation method and system for a pressureless diversion small hydropower to participate in the operation of a distribution network, which normalizes the output regulation ability indicators of the small hydropower in the wet season and the dry season to obtain the dimensionless conversion coefficients of relevant parameters, and constructs the regulation ability functions of the small hydropower in the wet season and the dry season respectively according to the dimensionless conversion coefficients. On the one hand, it can objectively and accurately evaluate the output regulation ability. On the other hand, after normalization, it can reduce the number of parameters involved in the evaluation index and reduce the complexity.

[0006] The above technical object of the present invention is achieved through the following technical solutions:

[0007] In the first aspect, a power regulation method for a pressureless diversion small hydropower to participate in the operation of a distribution network is provided, including the following steps:

[0008] Obtain the relevant parameters of the small hydropower storage space, the relevant parameters of the small hydropower generator set, and the output before the small hydropower regulation;

[0009] Evaluate and analyze the output regulation ability indicators of the small hydropower in the wet season and the dry season according to the relevant parameters of the small hydropower storage space and the relevant parameters of the small hydropower generator set;

[0010] Normalize the output regulation ability indicators of the small hydropower in the wet season and the dry season to obtain the dimensionless conversion coefficients of relevant parameters;

[0011] Construct the regulation ability functions of the small hydropower in the wet season and the dry season respectively according to the dimensionless conversion coefficients;

[0012] Select the small hydropower that meets the regulation time requirement as the target small hydropower according to the regulation ability function;

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

[0014] Calculate the adjusted output of the target small hydropower by combining the regulation intensity of the target small hydropower and the output before regulation.

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

[0016]

[0017] Among them, Q2 represents the inflow rate 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 rate of the small hydropower unit; Q1 represents the power generation flow rate of the small hydropower; α represents the second dimensionless conversion coefficient, with a value range of 0 ≤ α ≤ 1; V represents the maximum water storage capacity; T c represents the time required to fill the maximum water storage capacity V with the maximum power generation flow rate Q 1max ; V1 represents the water storage volume already stored; β represents the third dimensionless conversion coefficient, with a value range of 0 ≤ β ≤ 1; V2 represents the water storage volume to be stored.

[0018] Furthermore, the expression of the regulation ability function is specifically:

[0019]

[0020] where T +max represents the maximum upward adjustment time for the small hydropower to maintain power regulation; T -max represents the maximum downward adjustment time for the small hydropower to maintain power regulation.

[0021] Furthermore, the expression of the regulation intensity is specifically:

[0022]

[0023] where λ represents the regulation intensity; γ represents the intensity parameter.

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

[0025]

[0026] where represents the adjusted power of the i-th small hydropower; P i represents the output of the i-th small hydropower before regulation; γ i represents the regulation intensity of the i-th small hydropower.

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

[0028]

[0029] where represents the adjusted power of the i-th small hydropower; P i represents the output of the i-th small hydropower 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 requires the small hydropower to increase its output. When ΔP is less than zero, it means that the regional distribution network requires the small hydropower to reduce its output; S idenotes the rated installed capacity of the \(i\)-th small hydropower station; \(m\) represents the number of small hydropower stations with upward regulation ability among the target small hydropower stations.

[0030] Furthermore, if the target small hydropower station is in a high-water period, the calculation formula for the output of the target small hydropower station after participating in the downward power regulation of the distribution network is specifically:

[0031]

[0032] where denotes the adjusted power of the \(i\)-th small hydropower station; \(P\) i denotes the output of the \(i\)-th small hydropower station before regulation; \(\Delta P\) represents the overall power regulation demand of the distribution network. When \(\Delta P>0\), it means that the regional distribution network needs the small hydropower station to increase its output. When \(\Delta P<0\), it means that the regional distribution network needs the small hydropower station to reduce its output; \(S\) i denotes the rated installed capacity of the \(i\)-th small hydropower station; \(n\) represents the number of small hydropower stations with regulation ability in the regional distribution network.

[0033] In a second aspect, a power regulation system for a non-pressure diversion type small hydropower station participating in the operation of a distribution network is provided. This system is used to implement the power regulation method for a non-pressure diversion type small hydropower station participating in the operation of a distribution network as described in any one of the first aspects, including:

[0034] A parameter acquisition module, used to acquire parameters related to the water storage space of the small hydropower station, parameters related to the power generation of the small hydropower unit, and the output of the small hydropower station before regulation;

[0035] An index evaluation module, used to evaluate and analyze the output regulation ability index of the small hydropower station in high-water periods and low-water periods according to the parameters related to the water storage space of the small hydropower station and the parameters related to the power generation of the small hydropower unit;

[0036] A conversion processing module, used to perform normalization processing on the output regulation ability index of the small hydropower station in high-water periods and low-water periods to obtain a dimensionless conversion coefficient of relevant parameters;

[0037] A function construction module, used to construct the regulation ability functions of the small hydropower station in high-water periods and low-water periods respectively according to the dimensionless conversion coefficient;

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

[0039] An intensity calculation module, used to calculate the regulation intensity corresponding to each target small hydropower station when meeting the regulation time requirements. The target small hydropower station with a smaller regulation intensity has a higher priority to participate in the power regulation of the distribution network operation;

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

[0041] In a third aspect, a computer terminal is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the power regulation method for a pressureless diversion small hydropower station participating in the operation of a distribution network 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. When the computer program is executed by a processor, it can implement the power regulation method for a pressureless 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. For the power regulation method for a pressureless diversion small hydropower station participating in the operation of a distribution network provided by the present invention, the output regulation ability indexes of the small hydropower station in the high-water period and the low-water period are normalized to obtain the dimensionless conversion coefficients of relevant parameters, and the regulation ability functions of the small hydropower station in the high-water period and the low-water period are respectively constructed according to the dimensionless conversion coefficients. On the one hand, it can objectively and accurately evaluate the output regulation ability. On the other hand, after the normalization process, the number of parameters involved in the evaluation indexes can be reduced, and the complexity can be lowered.

[0045] 2. The present invention calculates the regulation intensity of each small hydropower station by considering the relationship between the regulation amount of the small hydropower station and its normal output, can clarify the priorities of multiple small hydropower generating units participating in the regulation, realize the rapid selection of the regulation target, and is beneficial to extending the operation life of the small hydropower generating units.

[0046] 3. When the regulation object is multiple hydropower generating units, the present invention can reasonably distribute the power for the small hydropower station to participate in the upward and downward regulation of the distribution network power in the low-water period and the high-water period according to the intensity parameters determining the regulation intensity, and realize the optimization of the overall regulation benefit. Description of the Drawings

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

[0048] Figure 1 is the flowchart in Embodiment 1 of the present invention;

[0049] Figure 2 is the system block diagram in Embodiment 2 of the present invention. Detailed Embodiments

[0050] To make the objectives, technical solutions, and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to embodiments and the accompanying drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0051] Embodiment 1: A power regulation method for a non-pressure diversion small hydropower participating in the operation of a distribution network, as Figure 1 shown, includes the following steps:

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

[0053] S2: Evaluate and analyze the output regulation ability index of the small hydropower in the wet season and the dry season according to the relevant parameters of the small hydropower storage space and the relevant parameters of the small hydropower generating unit.

[0054] S3: Normalize the output regulation ability index of the small hydropower in the wet season and the dry season to obtain the dimensionless conversion coefficient of the relevant parameters.

[0055] S4: Construct the regulation ability functions of the small hydropower in the wet season and the dry season respectively according to the dimensionless conversion coefficient.

[0056] S5: Select the small hydropower that meets the regulation time requirement as the target small hydropower according to the regulation ability function.

[0057] S6: Calculate the regulation intensity corresponding to each target small hydropower when meeting the regulation time requirement. The target small hydropower with a smaller regulation intensity has a higher priority to participate in the power regulation of the distribution network operation.

[0058] S7: Calculate the adjusted output of the target small hydropower by combining the regulation intensity of the target small hydropower and the output before regulation.

[0059] In step S1, the storage space of the small hydropower includes links with water storage capacity such as the forebay, diversion channel, and reservoir. The parameters to be obtained include the maximum water storage volume V (the generated water volume that can be stored in the entire water storage space of the small hydropower, unit: cubic meters), the water volume already stored V1 (the water volume already stored in the small hydropower storage space at a certain regulation ability calculation time t, unit: cubic meters), and the water volume to be stored V2 (the remaining water storage volume in the small hydropower storage space at a certain regulation ability calculation time t, unit: cubic meters). The relationship among the three is as follows: V = V1 + V2.

[0060] And the inflow rate of the small hydropower storage space is Q2 (the inflow water volume of the small hydropower storage space at time t, unit cubic meters per second), and the power generation flow rate of the small hydropower is Q1 (the flow rate flowing out of the small hydropower storage space at time t, that is, the flow rate used for power generation, unit: cubic meters per second).

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

[0062] In step S2, the present invention distinguishes between the high-water period and the low-water period, and establishes a quantitative calculation relationship from the aspects of increasing output, decreasing output and their corresponding maximum adjustment times respectively.

[0063] 1. Calculation of the regulation capacity of small hydropower in the high-water period

[0064] The high-water period referred to in the present invention is when the inflow Q2 of the small hydropower storage space is greater than the maximum power generation flow rate Q 1max , and at this time, the quantitative relationship among Q1, Q 1max , Q2 is as follows: Q1 ≤ Q 1max < Q2.

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

[0066] (1) Calculation of the upward regulation capacity of small hydropower in the high-water period

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

[0068] Since it is in the high-water period, it can continuously satisfy the small hydropower to maintain the maximum power generation, so the maximum continuous output time T +max is infinite. After the output is increased, it is beneficial to reduce the water waste flow rate of the small hydropower. At this time, the water waste flow rate Q a is: Q a = Q2 - Q 1max .

[0069] (2) Calculation of the downward regulation capacity of small hydropower in the high-water period

[0070] The down-regulation ability refers to the maximum output that can be reduced and the output time that can be sustained at the new output level when calculating the regulation ability of small hydropower units. The maximum up-regulation output range ΔP -max can be expressed as: ΔP -max = P1.

[0071] That is, in extreme cases, small hydropower can be shut down. At this time, the down-regulation ability is the power generation power P1 corresponding to the calculation moment, and the corresponding down-regulation time T -max is infinite. After the output is down-regulated, the water discharge flow of small hydropower will increase. At this time, the water discharge flow Q a is: Q a = Q2.

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

[0073] The period of water shortage 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 . During the period of water shortage, in order to make full use of water resources to achieve power conversion, when there is no output regulation requirement, the power generation flow can be set to the inflow flow, that is: Q1 = Q2.

[0074] At this time, the power generation power P can be expressed as: P q = g×Q1×h×η. During the period of water shortage, unless it is a particularly urgent situation, all output regulations are based on the principle of no water discharge.

[0075] (1) Calculation of the up-regulation ability of small hydropower output during the period of water shortage

[0076] The power generation flow corresponding to the up-regulated small hydropower output during the period of water shortage is Q1, and it satisfies the following relationship: Q2 < Q1 ≤ Q 1max .

[0077] The corresponding maximum regulation time T +max can be expressed as: If the up-regulation time exceeds T +max , the small hydropower will lose the up-regulation ability of the output, and the output will return to the output matching the inflow flow Q2 of the storage space.

[0078] (2) Calculation of the down-regulation ability of small hydropower output during the period of water shortage

[0079] The power generation flow corresponding to the up-regulated small hydropower output during the period of water shortage is Q1, and it satisfies the following relationship: Q1 < Q2.

[0080] The corresponding maximum regulation time T -max 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, a normalization process is carried out on the calculation method of the regulation capacity of small hydropower plants.

[0082] Taking Q 1max as the benchmark, 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 generating flow rate Q

[0085] In step S4, the regulation capacity 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 capacity 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 capacity of small hydropower plants in the water-rich period is simple, but the calculation method in the water shortage period contains four variables: α, β, k, and T c . To facilitate the calculation of the regulation capacity 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] Define the regulation intensity as: |1 - γ|. The larger its value, the greater the change in the output regulation of small hydropower, and the greater the impact on the normal power generation of small hydropower. T +max and T -max The larger it is, the longer the time that small hydropower can maintain power regulation under a certain regulation intensity, and the longer the regulation time.

[0093] Therefore, the specific expression of the regulation intensity is: λ = |1 - γ|, where λ represents the regulation intensity; γ represents the intensity parameter.

[0094] In step S7, small hydropower with regulation ability can be used to meet the regulation demand when the load or photovoltaic output changes. Based on the evaluation of the regulation ability of small hydropower in the previous steps, the participation of small hydropower regulation in the operation of the distribution network is optimized, which is divided into two categories: the low-water period and the high-water period. Assume that the number of small hydropower with regulation ability 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, and the regulation time demand is T t .

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

[0096] Calculate the upward regulation intensity corresponding to each small hydropower when meeting the regulation time T t . The regulation intensity λ of each small hydropower i can be expressed as:

[0097]

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

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

[0100]

[0101] where P i is the output of the i-th small hydropower before regulation.

[0102] (2) Small hydropower participates in the downward power regulation of the distribution network during the low-water period

[0103] Calculate the downward regulation intensity corresponding to each small hydropower when the regulation time T is satisfied t At this time, the regulation intensity λ of each small hydropower i Can be expressed as:

[0104] The power of the i-th small hydropower after adjustment is Can be expressed as:

[0105] (3) During the wet season, small hydropower participates in the upward power regulation of the distribution network

[0106] Judge whether each small hydropower is at the maximum power generation output. If a certain small hydropower is already at the maximum output state, it cannot participate in the upward power regulation. Assume that among n small hydropowers, m still have the ability to regulate upward, where m ≤ n. Then, allocate the upward regulation output of m small hydropowers according to the proportion of installed capacity. The power that each small hydropower needs to adjust is ΔP i , i ∈ [1, m], where:

[0107]

[0108] The power of the i-th small hydropower after adjustment is Can be expressed as:

[0109] (4) During the wet season, small hydropower participates in the downward power regulation of the distribution network

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

[0111]

[0112] The power of the i-th small hydropower after adjustment is Can be expressed as:

[0113] Embodiment 2: A power regulation system for a non-pressure diversion small hydropower participating in the operation of a distribution network. This system is used to implement the power regulation method for a non-pressure diversion small hydropower participating in the operation of a distribution network as described in Embodiment 1. As Figure 2 shown, it includes a parameter acquisition module, an index 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 acquire the relevant parameters of the small hydropower storage space, the relevant parameters of the small hydropower generating unit, and the output before the small hydropower regulation; the index evaluation module is used to evaluate and analyze the output regulation ability index of the small hydropower in the wet season and the dry season according to the relevant parameters of the small hydropower storage space and the relevant parameters of the small hydropower generating unit; the conversion processing module is used to normalize the output regulation ability index of the small hydropower in the wet season and the dry season to obtain the dimensionless conversion coefficient of the relevant parameters; the function construction module is used to construct the regulation ability functions of the small hydropower in the wet season and the dry season respectively according to the dimensionless conversion coefficient; the target screening module is used to screen out the small hydropower that meets the regulation time requirement as the target small hydropower according to the regulation ability function; the intensity calculation module is used to calculate the regulation intensity corresponding to each target small hydropower when the regulation time requirement is met, and the target small hydropower with a small regulation intensity has a higher priority to participate 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 the regulation.

[0115] The present invention also records a computer terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the power regulation method for the pressureless diversion type small hydropower participating in the distribution network operation as recorded in Embodiment 1.

[0116] The present invention also records a computer-readable medium, on which a computer program is stored. When the computer program is executed by a processor, it can implement the power regulation method for the pressureless diversion type small hydropower participating in the distribution network operation as recorded in Embodiment 1.

[0117] Working principle: The present invention normalizes the output regulation ability index of the small hydropower in the wet season and the dry season to obtain the dimensionless conversion coefficient of the relevant parameters, and constructs the regulation ability functions of the small hydropower in the wet season and the dry season respectively according to the dimensionless conversion coefficient. On the one hand, it can objectively and accurately evaluate the output regulation ability. On the other hand, after the normalization process, it can reduce the number of parameters involved in the evaluation index and reduce the complexity. In addition, the present invention calculates the regulation intensity of each small hydropower considering the relationship between the regulation amount of the small hydropower and the normal output, which can clarify the priority of multiple small hydropower generating units participating in the regulation, realize the rapid selection of the regulation target, and is beneficial to extending the operation life of the small hydropower generating unit;

[0118] In addition, when the regulation object of the present invention is multiple hydropower generating units, it can reasonably allocate the power for the small hydropower to participate in the upward and downward regulation of the distribution network power in the dry season and the wet season according to the intensity parameter that determines the regulation intensity, so as to optimize the overall regulation benefit.

[0119] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0120] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0121] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means realizes the functions specified in Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0123] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power regulation method for a pressureless diversion-type small hydropower station to participate in the operation of a distribution network, characterized in that, It includes the following steps: Obtain the relevant parameters of the small hydropower storage space, the relevant parameters of the small hydropower generating unit, and the output before the small hydropower regulation; Evaluate and analyze the output regulation ability indexes of the small hydropower in the wet season and the dry season according to the relevant parameters of the small hydropower storage space and the relevant parameters of the small hydropower generating unit; Normalize the output regulation ability indexes of the small hydropower in the wet season and the dry season to obtain the dimensionless conversion coefficients of the relevant parameters; Construct the regulation ability functions of the small hydropower in the wet season and the dry season respectively according to the dimensionless conversion coefficients; Select the small hydropower that meets the regulation time requirement as the target small hydropower according to the regulation ability function; Calculate the regulation intensity corresponding to each target small hydropower when meeting the regulation time requirement. The target small hydropower with a smaller regulation intensity has a higher priority to participate in the power regulation of the distribution network operation; Calculate the adjusted output of the target small hydropower by combining the regulation intensity of the target small hydropower and the output before regulation; The specific calculation expression of the dimensionless conversion coefficient is: ； Among them, represents the inflow rate of the small hydropower storage space; represents the first dimensionless conversion coefficient, and its value range is ; represents the maximum power generation flow rate of the small hydropower unit; represents the power generation flow rate of the small hydropower; represents the second dimensionless conversion coefficient, and its value range is ; represents the maximum water storage capacity; represents the time required to fill the maximum water storage capacity with the maximum power generation flow rate ; represents the water storage volume already stored; represents the third dimensionless conversion coefficient, and its value range is ; represents the water storage volume to be stored; The expression of the regulation ability function is specifically: ； ； Among them, represents the maximum upward adjustment time for small hydropower to maintain power regulation; represents the maximum downward adjustment time for small hydropower to maintain power regulation; The expression of the regulation intensity is specifically: ； Among them, represents the adjustment intensity; represents the intensity parameter.

2. The power regulation method for a pressureless diversion-type small hydropower station to participate in the operation of a distribution network according to claim 1, characterized in that, If the target small hydropower is in the dry season, the specific calculation formula for the adjusted output of the target small hydropower is: ； Among them, represents the adjusted power of the i-th small hydropower station; represents the output of the i-th small hydropower station before regulation; represents the regulation intensity of the i-th small hydropower station.

3. The power regulation method for a pressureless diversion-type small hydropower station participating in the operation of a distribution network according to claim 1, wherein If the target small hydropower is in the wet season, the specific calculation formula for the adjusted output of the target small hydropower when participating in the upward regulation of the distribution network power is: ； Among them, represents the adjusted power of the i-th small hydropower station; represents the output of the i-th small hydropower station before regulation; represents the overall power regulation demand of the distribution network, when it is greater than zero, it means that the regional distribution network needs the small hydropower station to increase its output, when it is less than zero, it means that the regional distribution network needs the small hydropower station to reduce its output; represents the rated installed capacity of the i-th small hydropower station; represents the number of small hydropower stations with upward regulation ability among the target small hydropower stations.

4. The power regulation method for a pressureless diversion-type small hydropower station to participate in the operation of a distribution network according to claim 1, characterized in that If the target small hydropower is in the wet season, the specific calculation formula for the adjusted output of the target small hydropower when participating in the downward regulation of the distribution network power is: ； wherein, represents the adjusted power of the i-th small hydropower station; represents the output of the i-th small hydropower station before regulation; represents the overall power regulation demand of the distribution network, when it is greater than zero, it means that the regional distribution network needs the small hydropower station to increase its output, when it is less than zero, it means that the regional distribution network needs the small hydropower station to reduce its output; represents the rated installed capacity of the i-th small hydropower station; represents the number of small hydropower stations with adjustable capacity in the regional distribution network.

5. A power regulation system for a non-pressurized diversion type small hydropower station to participate in the operation of a distribution network, characterized in that, This system is used to implement the power regulation method for the pressureless diversion type small hydropower participating in the distribution network operation as described in any one of claims 1-4, including: A parameter acquisition module, used to obtain the relevant parameters of the small hydropower storage space, the relevant parameters of the small hydropower generating unit, and the output before the small hydropower regulation; An index evaluation module, used to evaluate and analyze the output regulation ability indexes of the small hydropower in the wet season and the dry season according to the relevant parameters of the small hydropower storage space and the relevant parameters of the small hydropower generating unit; A conversion processing module, used to normalize the output regulation ability indexes of the small hydropower in the wet season and the dry season to obtain the dimensionless conversion coefficients of the relevant parameters; A function construction module, used to construct the regulation ability functions of the small hydropower in the wet season and the dry season respectively according to the dimensionless conversion coefficients; A target screening module, used to select the small hydropower that meets the regulation time requirement as the target small hydropower according to the regulation ability function; An intensity calculation module, used to calculate the regulation intensity corresponding to each target small hydropower when meeting the regulation time requirement. The target small hydropower with a smaller regulation intensity has a higher priority to participate in the power regulation of the distribution network operation; A power calculation module, 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.

6. A computer terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the power regulation method for the pressureless diversion type small hydropower participating in the distribution network operation as described in any one of claims 1-4.

7. A computer-readable medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it can implement the power regulation method for the pressureless diversion type small hydropower participating in the distribution network operation as described in any one of claims 1-4.

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