Power distribution network active and reactive cooperative voltage regulation method and device for large-scale aquaculture, and medium

Abstract

The invention relates to the field of power distribution network voltage regulation, in particular to a power distribution network active and reactive coordinated voltage regulation method and device for large-scale aquaculture and a medium, and the method comprises the following steps: firstly, combining life habits of aquatic organisms and operation characteristics of aquaculture equipment, constructing an energy consumption model of the aquaculture equipment, and calculating the total active power of equipment such as automatic bait casting and an aerator; then, according to flexibility of equipment energy consumption requirements, loads are classified, corresponding constraint conditions are established, and a requirement response model is constructed; and finally, with minimum node voltage fluctuation as a target, realizing active-reactive cooperative voltage regulation by means of joint participation of distributed photovoltaic, energy storage and the like, and setting various constraint conditions. According to the method, the voltage out-of-limit problem of the rural power distribution network containing large-scale aquaculture is solved, and the safe and stable operation performance of the power distribution network is improved. Meanwhile, by establishing the energy consumption model, farmers and power management personnel are helped to know the equipment energy consumption, reasonably plan power supply and effectively reduce voltage fluctuation, and the method has remarkable practical value.

Description

Technical Field

[0001] The present invention relates to the field of regulating the voltage of a distribution network, and particularly to a method and device, and a medium for coordinated active and reactive voltage regulation of a distribution network for large-scale aquaculture. Background Art

[0002] In the prior art, for the voltage regulation of rural distribution networks, the main methods are still to regulate the voltage through conventional means such as on-load tap changers, switching shunt capacitor banks, distributed photovoltaics, energy storage, etc. However, aquaculture farms rely heavily on a large number of devices such as aerators, heat pumps, and water pumps driven by electricity to maintain a water environment suitable for the growth of aquaculture organisms. These devices usually have a large operating power, and when a large number of them are connected to the distribution network, they will bring a greater risk of voltage fluctuations to the rural distribution network in the area, affecting the normal power consumption of other users.

[0003] Therefore, it is very necessary to propose a method for coordinated active and reactive voltage regulation of a distribution network for large-scale aquaculture to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and device, and a medium for coordinated active and reactive voltage regulation of a distribution network for large-scale aquaculture, so as to solve the problem that a large number of aquaculture farms connected to the distribution network will bring a greater risk of voltage fluctuations to the rural distribution network in the area.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A method for coordinated active and reactive voltage regulation of a distribution network for large-scale aquaculture, characterized in that the method includes:

[0007] S1: Combining the living habits of aquatic organisms and the operating characteristics of aquaculture equipment, respectively constructing an energy consumption model for aquaculture equipment for automatic feeding equipment, aerator equipment, water quality regulation equipment, and greenhouse aquaculture heating equipment, and calculating the total active power of each equipment;

[0008] S2: According to the flexible adjustable characteristics of the energy consumption requirements of aquaculture equipment, dividing the load into transferable load and interruptible load, where the transferable load includes automatic feeding equipment and water quality regulation equipment, and the interruptible load includes aerator equipment and greenhouse aquaculture heating equipment, and establishing corresponding constraint conditions to construct a demand response model for large-scale aquaculture equipment;

[0009] S3: In the case of large-scale aquaculture being connected to the distribution network, constructing a model with the goal of minimizing the node voltage fluctuation, setting constraint conditions for power flow equations, load demand, photovoltaic output, reactive power compensation device, energy storage, and node voltage, and realizing coordinated active and reactive voltage regulation through the joint participation of distributed photovoltaics, energy storage, reactive power compensation devices, and the demand response of aquaculture equipment.

[0010] Furthermore, the energy consumption models of each aquaculture equipment in step S1 are as follows:

[0011] The energy consumption model of the automatic feeding equipment is:

[0012]

[0013] Wherein, P fee (t) is the active power of the feeding equipment within the time period t, is the maximum active power of the feeding equipment, Δt is the time interval from time period t to t + 1, k fee is the number of feeding times within the time period Δt, S fee is the feeding trajectory, V fee is the feeding speed, is the power factor angle of the feeding equipment, Q fee (t) is the reactive power of the feeding equipment within the time period t;

[0014] The energy consumption model of the aerator equipment is:

[0015]

[0016] Wherein, P oxy (t) is the active power of the aerator equipment within the time period t, is the maximum active power of the aerator equipment, T oxy is the usage time of the aeration equipment within the time period Δt, Q oxy (t) is the reactive power of the aerator equipment within the time period t, is the power factor angle of the aerator equipment;

[0017] The energy consumption model of the water quality regulation equipment is:

[0018]

[0019] Wherein, P wat (t) is the active power of the water quality regulation equipment within the time period t, is the maximum active power of the water quality regulation equipment, k wat is the water change frequency within the time period Δt, A wat is the aquaculture area, h wat is the water change height, Q wat (t) is the reactive power of the water quality regulation equipment within the time period t, is the power factor angle of the water quality regulation equipment;

[0020] The energy consumption model of the greenhouse aquaculture heating equipment is:

[0021]

[0022] Wherein, Ppum (t) is the active power of the greenhouse aquaculture heating equipment during the t period, h pro (t) is the heat provided by the heating system during the t period, Q pum (t) is the reactive power of the greenhouse aquaculture heating equipment during the t period, η pum is the heat efficiency value of the heat pump is the power factor angle of the heat pump

[0023] Further, in step S2:

[0024] The participation demand response constraints of the automatic feeding equipment and water quality control equipment are:

[0025]

[0026] Wherein, is the active load transferred out by the transferable load of node i during the t period is the active load transferred in during the t period is the state variable of the transferable load of node i during the t period is used to represent the load transfer out represents the load transfer in is the maximum transfer out amount of the transferable load is the maximum transfer in amount of the transferable load, T is the total scheduling time is the power factor angle of the transferable load is the reactive load transferred out by the transferable load of node i during the t period is the reactive load transferred in by the transferable load of node i during the t period

[0027] Further, the transferable load of node i refers to the automatic feeding equipment and water quality control equipment of node i

[0028] Further, in step S2, the participation demand response constraints of the aerator equipment are as follows:

[0029]

[0030] Wherein, represents the single interruption duration of the aerator of node i represents whether the aerator of node i is interrupted represents the maximum interruption duration of the aerator represents the maximum number of interruptions of the aerator represents the active load reduced by the aerator of node i represents the maximum active power of the aerator represents the reactive load reduced by the aerator of node i is the aerator rate factor angle

[0031] Further, in step S2, the participation demand response constraints of the greenhouse aquaculture heating equipment are as follows:

[0032]

[0033] where τ wat (t) is the temperature of the aquaculture water body at time t, are the minimum and maximum temperature requirements of the aquaculture water body, and Δh pro (t) represents the heat reduction provided by the heat pump when the temperature of the aquaculture water body drops by Δτ, represents the active load reduction of greenhouse aquaculture at node i at time t, represents the reactive load reduction of greenhouse aquaculture at node i at time t, and η pum is the heat efficiency value of the heat pump, is the power factor angle of the heat pump.

[0034] Further, in step S3, the minimum node voltage fluctuation model is:

[0035]

[0036] where f is the objective function, is the voltage amplitude of node i at time t, is the reference voltage of the distribution network, N is the number of nodes in the distribution network, and T is the total dispatching time.

[0037] Further, in step S3, the constraint conditions are as follows:

[0038] The constraint condition of the power flow equation is:

[0039]

[0040] where, and are the active powers of the power supply, photovoltaic, energy storage, and load of the i-th node at time t, respectively; and are the reactive powers of the power supply, photovoltaic, reactive power compensation device, and load of the i-th node at time t, respectively; G ij , B ij and δ ij are the conductance, reactance, and phase angle between nodes i and j, respectively, is the voltage amplitude of node j at time t;

[0041] The load demand constraint condition is:

[0042]

[0043] where, Denote the total active power load and total reactive power load of node i at time t. Denote the actual active power load of the aquaculture equipment at node i at time t after implementing demand response. Denote the remaining active power load of node i at time t. Denote the actual reactive power load of the aquaculture equipment at node i at time t after implementing demand response. Denote the remaining active power load of node i at time t;

[0044] The photovoltaic output constraint is:

[0045]

[0046] Among them, Denote the maximum apparent, reactive, and active power of the photovoltaic at node i. Denote the reactive and active power of the photovoltaic at node i at time t;

[0047] The reactive power compensation device constraint is:

[0048]

[0049] Among them, Denote the maximum and minimum reactive power of the reactive power compensation device connected to node i. Denote the reactive power of the reactive power compensation device at node i at time t;

[0050] The energy storage constraint is:

[0051]

[0052] Among them, Denote the state of charge of the energy storage at node i at time t. Denote that the energy storage is in the discharging state. Denote the charging power and discharging power of the energy storage at node i at time t, η cha 、η dis Denote the charging and discharging efficiency of the energy storage. Denote the maximum charging power and minimum charging power of the energy storage at node i. Denote the maximum and minimum state of charge of the energy storage at node i;

[0053] The node voltage constraint is:

[0054]

[0055] Among them, Denote the minimum and maximum voltage magnitudes of node i. Denote the voltage magnitude of node j at time t.

[0056] Preferably, a computer device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the method for coordinated active and reactive voltage regulation of the distribution network for large-scale aquaculture described in any one of the claims.

[0057] Preferably, a computer-readable storage medium stores a computer program thereon. The storage medium includes the stored program, and during the operation of the program, it controls the device where the storage medium is located to execute the method for coordinated active and reactive voltage regulation of the distribution network for large-scale aquaculture described in any one of the claims.

[0058] Technical effects and advantages of the present invention:

[0059] 1. Based on the establishment of the energy consumption model and demand response model of aquaculture equipment, a method for coordinated active and reactive voltage regulation with the minimum node voltage fluctuation of the distribution network as the goal is proposed. Through distributed photovoltaic, energy storage, reactive power compensation devices, and demand response of aquaculture equipment for active-reactive joint voltage regulation, the problem of voltage over-limit in rural distribution networks with large-scale aquaculture is solved, thereby improving the safe and stable operation performance of the distribution network.

[0060] 2. With the minimum node voltage fluctuation as the goal, distributed photovoltaic, energy storage, reactive power compensation devices, and demand response of aquaculture equipment jointly participate in voltage regulation, and multiple constraint conditions are set. The power flow equation constraint ensures that the power transmission and distribution conform to the circuit law; the load demand constraint maintains normal power supply; the constraints related to photovoltaic, reactive power compensation devices, and energy storage respectively ensure the safe operation of the corresponding equipment, improve the power factor, and enhance the regulation ability; the node voltage constraint avoids voltage over-limit, and overall improves the safety, stability, and power quality of the distribution network.

[0061] 3. An energy consumption model is constructed by combining the living habits of aquatic organisms and the operating characteristics of aquaculture equipment, which can calculate the total active power of each device. This helps aquaculture farmers and power management personnel understand the energy consumption of the equipment, and based on the energy consumption differences of the equipment in different aquaculture stages, plan the power supply in advance to achieve reasonable use of energy. Description of the Drawings

[0062] Figure 1 Steps of the method for coordinated active and reactive voltage regulation of the distribution network with large-scale aquaculture in the present invention.

[0063] Figure 2 Schematic diagram of the IEEE33-node distribution network applied in the embodiment of the present invention.

[0064] Figure 3 The lowest voltage before and after voltage regulation optimization of the distribution network in the embodiment of the present invention. Detailed Embodiments

[0065] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0066] The present invention provides a method for coordinated active and reactive voltage regulation of a distribution network for large-scale aquaculture, as shown in Figures 1 - 3 Figure, and the method includes:

[0067] S1: Combining the living habits of aquatic organisms and the operating characteristics of aquaculture equipment, respectively constructing energy consumption models for aquaculture equipment such as automatic feeding equipment, aerator equipment, water quality regulation equipment, and greenhouse aquaculture heating equipment, and calculating the total active power of each equipment;

[0068] S2: According to the flexible adjustable characteristics of the energy consumption requirements of aquaculture equipment, dividing the load into transferable load and interruptible load. The transferable load includes automatic feeding equipment and water quality regulation equipment, and the interruptible load includes aerator equipment and greenhouse aquaculture heating equipment, and establishing corresponding constraints to construct a demand response model for large-scale aquaculture equipment;

[0069] S3: In the case where large-scale aquaculture is connected to the distribution network, constructing a model with the goal of minimizing the node voltage fluctuation, setting constraints such as power flow equation constraints, load demand constraints, photovoltaic power output constraints, reactive power compensation device constraints, energy storage constraints, and node voltage constraints, and realizing coordinated active and reactive voltage regulation through the joint participation of distributed photovoltaics, energy storage, reactive power compensation devices, and the demand response of aquaculture equipment.

[0070] Furthermore, the transferable load is for automatic feeding equipment and water quality regulation equipment, and the interruptible load is for aerator equipment and greenhouse aquaculture heating equipment;

[0071] Furthermore, the energy consumption models of each aquaculture equipment in step S1 are as follows:

[0072] The energy consumption model of the automatic feeding equipment is:

[0073]

[0074] where P fee (t) is the active power of the feeding equipment in the t-th period, is the maximum active power of the feeding equipment, Δt is the time interval from period t to t + 1, k fee is the number of feeding times within the period Δt, S fee is the feeding trajectory, V fee is the feeding speed, is the power factor angle of the feeding device, Q fee Q(t) is the reactive power of the feeding device during the t period;

[0075] The energy consumption model of the aerator is:

[0076]

[0077] where P oxy P(t) is the active power of the aerator during the t period, is the maximum active power of the aerator, T oxy is the usage time of the aeration equipment within the Δt period, Q oxy Q(t) is the reactive power of the aerator during the t period, is the power factor angle of the aerator;

[0078] The energy consumption model of the water quality regulation equipment is:

[0079]

[0080] where P wat P(t) is the active power of the water quality regulation equipment during the t period, is the maximum active power of the water quality regulation equipment, k wat is the water change frequency within the Δt period, A wat is the aquaculture area, h wat is the water change height, Q wat Q(t) is the reactive power of the water quality regulation equipment during the t period, is the power factor angle of the water quality regulation equipment;

[0081] The energy consumption model of the greenhouse aquaculture heating equipment is:

[0082]

[0083] where P pum P(t) is the active power of the greenhouse aquaculture heating equipment during the t period, h pro h(t) is the heat provided by the heating system during the t period, Q pum Q(t) is the reactive power of the greenhouse aquaculture heating equipment during the t period, η pum is the heat efficiency value of the heat pump, is the power factor angle of the heat pump.

[0084] In the embodiments of the present invention, by comprehensively considering factors such as the number of feeding times, feeding trajectory, feeding speed, and power factor angle within a time period, these parameters are incorporated into the calculation formula to determine the total active power of the automatic feeding device during operation; the usage time of the aerator is directly related to the duration of its power consumption, and the power factor angle reflects the proportion of the effective power consumed by the device. The two are combined to calculate the total active power of the aerator device; the water change frequency determines the frequency of device operation, and the breeding area and the height of the water change volume are highly correlated with the work done by the device. The power factor angle reflects the power consumption efficiency, and thus the total active power of the water quality regulation device is obtained; the heat efficiency value of the heat pump reflects the efficiency of converting electrical energy into heat energy, and the power factor angle reflects the power consumption efficiency. The two together determine the total active power of the greenhouse aquaculture heating device;

[0085] By constructing these models, the active power consumption of various aquaculture devices under different operating conditions can be accurately calculated. This helps farmers and power management personnel clearly understand the energy consumption of each device, providing a quantitative basis for reasonably arranging device operation and optimizing energy use. It is possible to clarify the energy consumption differences of each device at different aquaculture stages, thereby planning power supply in advance;

[0086] The calculation results of the energy consumption model are important basic data for constructing the demand response model and the distribution network voltage regulation optimization model. In the demand response model, the energy consumption characteristics of the device determine its load transferable or interruptible capacity; in the distribution network voltage regulation optimization model, accurate device energy consumption data helps to better analyze the power balance and voltage fluctuation conditions of the distribution network, making the voltage regulation strategy more targeted and effective, and improving the operation stability and safety of the distribution network.

[0087] Furthermore, in step S2, the constraints for the automatic feeding device and the water quality regulation device to participate in the demand response are as follows:

[0088] The constraint for the automatic feeding device is:

[0089]

[0090] Among them, is the active load transferred out by the transferable load at node i in time period t, is the active load transferred in during time period t, is the state variable of the transferable load at node i in time period t, is used to represent load transfer out, represents load transfer in, is the maximum transfer out amount of the transferable load, is the maximum transfer in amount of the transferable load, T is the total dispatching time, is the power factor angle of the transferable load, is the reactive load transferred out by the transferable load at node i in time period t, is the reactive power load transferred into the transferable load of node i at time t.

[0091] Furthermore, in step S2, the participation demand response constraints of the aerator equipment are as follows:

[0092] The constraint conditions of the aerator equipment are:

[0093]

[0094] where, represents the single interruption duration of the aerator at node i, represents whether the aerator at node i is interrupted, represents the maximum interruption duration of the aerator, represents the maximum number of interruptions of the aerator, represents the active power load reduced by the aerator at node i, represents the maximum active power of the aerator, represents the reactive power load reduced by the aerator at node i, is the power factor angle of the aerator.

[0095] Furthermore, in step S2, the participation demand response constraints of the greenhouse aquaculture heating equipment are as follows:

[0096]

[0097] where, τ wat (t) is the temperature of the aquaculture water body at time t, are the minimum and maximum temperature requirements of the aquaculture water body, and Δh pro (t) represents the reduction amount of heat provided by the heat pump when the temperature of the aquaculture water body drops by Δτ, represents the active power load reduced by the greenhouse aquaculture at node i at time t, represents the reactive power load reduced by the greenhouse aquaculture at node i at time t, and η pum is the heat efficiency value of the heat pump, is the power factor angle of the heat pump.

[0098] In an embodiment of the present invention, considering that the energy consumption requirements of the automatic feeding equipment and the water quality control equipment have a certain flexibility, during the demand response voltage regulation process, an active power transfer rule is set for them. By defining the active power variables transferred out and into the transferable load of node i at time t, and the variables representing the load transfer state, the corresponding mathematical constraint relationships are established to standardize the active power transfer behaviors of these two types of equipment at different times, ensuring that when they participate in the distribution network voltage regulation, they can not only adjust the power consumption time according to the grid demand, but also meet their own operation requirements, and guarantee the normal progress of the aquaculture activities;

[0099] Based on the importance of aerators in aquaculture and their load-interruptible characteristics, set limit conditions such as the single interruption duration, whether to interrupt, the maximum interruption duration, and the maximum number of interruptions of the aerator, and clarify the relationship between the active power load reduction of the aerator at node i. When using the aerator equipment for demand response voltage regulation, ensure the basic stability of the dissolved oxygen environment in the aquaculture water body, avoid the death of aquaculture organisms due to oxygen deficiency caused by excessive interruption of the aerator operation, and at the same time reasonably control the reduction amount of its active power load to meet the voltage regulation requirements of the distribution network;

[0100] Combined with the function of greenhouse aquaculture heating equipment and the temperature requirements of the aquaculture water body, determine the relationship between the heat reduction amount of the heating system and the active power load reduction of greenhouse aquaculture at node i according to the minimum and maximum temperature limits of the aquaculture water body at time t; when participating in demand response voltage regulation through greenhouse aquaculture heating equipment, ensure that the temperature of the aquaculture water body is always maintained within an appropriate range, ensure the stability of the growth environment of aquaculture organisms, and at the same time reasonably adjust the active power load of the equipment to assist the distribution network in voltage regulation.

[0101] S3: In the case of large-scale aquaculture connected to the distribution network, build a model with the goal of minimizing the node voltage fluctuation, set the constraints of the power flow equation, load demand, photovoltaic output, reactive power compensation device, energy storage, and node voltage, and realize active and reactive coordinated voltage regulation through the joint participation of distributed photovoltaic, energy storage, reactive power compensation device, and aquaculture equipment demand response.

[0102] The model for minimizing node voltage fluctuation is:

[0103]

[0104] Among them, represents the minimum and maximum values of the voltage amplitude of node i, represents the voltage amplitude of node j at time t.

[0105] The constraint conditions are as follows:

[0106] The constraint condition of the power flow equation is:

[0107]

[0108] Among them, and are the active powers of the power supply, photovoltaic, energy storage, and load of the i-th node at time t, respectively; and are the reactive powers of the power supply, photovoltaic, reactive power compensation device, and load of the i-th node at time t, respectively; G ij 、B ij and δ ij are the conductance, reactance, and phase angle between nodes i and j, respectively, is the voltage amplitude of node j at time period t;

[0109] Ensure that the power transmission and distribution in the distribution network comply with the basic laws of the circuit, accurately describe the power balance relationship of each node in the distribution network, and provide a basis for subsequent optimization calculations.

[0110] The load demand constraint condition is:

[0111]

[0112] Among them, represents the total active load and total reactive load of node i at time period t, represents the actual active load of the aquaculture equipment at node i at time period t after implementing demand response, represents the remaining active load of node i at time period t, represents the actual reactive load of the aquaculture equipment at node i at time period t after implementing demand response, represents the remaining active load of node i at time period t;

[0113] Maintain the normal power supply of the distribution network, ensure the normal operation of aquaculture equipment and other electrical equipment, and improve the power supply reliability of the distribution network.

[0114] The PV output constraint condition is:

[0115]

[0116] Among them, represents the maximum apparent, reactive, and active power of PV at node i, represents the reactive and active power of PV at node i at time period t;

[0117] Give full play to the voltage regulation role of PV, while ensuring the safe and reliable operation of PV equipment and extending the service life of the equipment.

[0118] The reactive power compensation device constraint condition is:

[0119]

[0120] Among them, represents the maximum and minimum reactive power of the reactive power compensation device connected to node i, represents the reactive power of the reactive power compensation device at node i at time period t;

[0121] Effectively improve the power factor of the distribution network, reduce line losses, and improve the voltage stability and power quality of the distribution network.

[0122] The energy storage constraint condition is:

[0123]

[0124] Among them, represents the state of charge of the energy storage of node i at time t, represents that the energy storage is in the discharging state, represents the charging power and discharging power of the energy storage of node i at time t, η cha and η dis represent the charging and discharging efficiencies of the energy storage, represent the maximum charging power and minimum charging power of the energy storage of node i, represent the maximum and minimum states of charge of the energy storage of node i;

[0125] Enhance the regulation ability of the energy storage in the voltage regulation of the distribution network, improve the service life and operation safety of the energy storage system, and enhance the overall stability of the distribution network.

[0126] The node voltage constraint conditions are:

[0127]

[0128] Among them, represent the minimum and maximum values of the voltage amplitude of node i, represents the voltage amplitude of node j at time t.

[0129] Effectively avoid node voltage over-limit, ensure the safe and stable operation of the distribution network, ensure the normal operation of power equipment, and improve power supply reliability and power quality.

[0130] Based on the above implementation solutions, in order to verify the beneficial effects of the present invention, specific numerical examples are analyzed. Taking the Figure 2 shown IEEE 33-node distribution network for analysis, the rated voltage of the distribution network is 12.66 kV, the total load is 3715 kW + j2300 kvar, the allowable range of node voltage is ±5% of the rated voltage, and the large-scale aquaculture area is set at node 4. Under the proposed method, the lowest voltages before and after the voltage regulation optimization of the distribution network are as Figure 3 shown, indicating that the voltage fluctuation of the node after optimization is much smaller than that before optimization. Through the analysis of the numerical examples, it can be seen that the active-reactive power coordinated voltage regulation method proposed by the present invention can effectively reduce the voltage fluctuation of the distribution network with large-scale aquaculture, and has a positive effect on improving the safe operation performance of the distribution network.

[0131] Furthermore, a computer device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the active-reactive power coordinated voltage regulation method for a distribution network of large-scale aquaculture in the embodiment.

[0132] Further, a computer-readable storage medium stores a computer program thereon. The storage medium includes the stored program, wherein when the program runs, it controls the device where the storage medium is located to execute a method for coordinated active and reactive voltage regulation of a distribution network in large-scale aquaculture as described in the embodiments.

[0133] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all of these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for coordinated voltage regulation of active and reactive power in a distribution network for large-scale aquaculture, characterized in that the method Including: S1: Combining the living habits of aquatic organisms with the operating characteristics of aquaculture equipment, respectively construct energy consumption models for aquaculture equipment such as automatic feeding equipment, aerator equipment, water quality regulation equipment, and greenhouse aquaculture heating equipment, and calculate the total active power of each equipment. S2: According to the flexible adjustable characteristics of the energy consumption requirements of aquaculture equipment, divide the load into transferable load and interruptible load. The transferable load includes automatic feeding equipment and water quality regulation equipment, and the interruptible load includes aerator equipment and greenhouse aquaculture heating equipment, and establish corresponding constraints to construct a demand response model for large-scale aquaculture equipment. S3: In the case of large-scale aquaculture accessing the distribution network, construct a model with the goal of minimizing the node voltage fluctuation, set constraints such as power flow equation constraints, load demand constraints, photovoltaic output constraints, reactive power compensation device constraints, energy storage constraints, and node voltage constraints, and through the joint participation of distributed photovoltaic, energy storage, reactive power compensation device, and aquaculture equipment demand response, achieve active and reactive power coordinated voltage regulation.

2. The active and reactive power coordinated voltage regulation method for the distribution network of large-scale aquaculture according to claim 1, wherein, The energy consumption models of each aquaculture equipment in step S1 are as follows: The energy consumption model of the automatic feeding equipment is: Among them, P fee (t) is the active power of the feeding device within the time period t, is the maximum active power of the feeding device, Δt is the time interval from time period t to t + 1, and k fee is the number of feeding times within the time period Δt, S fee is the feeding trajectory, V fee is the feeding speed, is the power factor angle of the feeding device, and Q fee (t) is the reactive power of the feeding device within the time period t; The energy consumption model of the aerator equipment is: Among them, P oxy (t) is the active power of the aerator equipment during the t period, is the maximum active power of the aerator equipment, T oxy is the usage time of the aeration equipment during the Δt period, Q oxy (t) is the reactive power of the aerator equipment during the t period, is the power factor angle of the aerator equipment; The energy consumption model of the water quality regulation equipment is: Among them, P wat (t) is the active power of the water quality control equipment during the t period, is the maximum active power of the water quality control equipment, k wat is the water change frequency during the Δt period, A wat is the aquaculture area, h wat is the water change height, Q wat (t) is the reactive power of the water quality control equipment during the t period, is the power factor angle of the water quality control equipment; The energy consumption model of the greenhouse aquaculture heating equipment is: Among them, P pum (t) is the active power of the greenhouse aquaculture heating equipment during the t period, h pro (t) is the heat provided by the heating system during the t period, Q pum (t) is the reactive power of the greenhouse aquaculture heating equipment during the t period, η pum is the heat efficiency value of the heat pump, is the power factor angle of the heat pump.

3. A method for coordinated active and reactive voltage regulation of a distribution network in large-scale aquaculture according to any one of claims 1, characterized in that In step S2: The participation demand response constraints of the automatic feeding equipment and the water quality regulation equipment are: Among them, is the active power load transferred out by the transferable load of node i in period t, is the active power load transferred in during period t, is the state variable of the transferable load of node i in period t, used to represent the load transfer out, represents the load transfer in, is the maximum transfer out amount of the transferable load, is the maximum transfer in amount of the transferable load, T is the total scheduling time, is the power factor angle of the transferable load, is the reactive power load transferred out by the transferable load of node i in period t, is the reactive power load transferred in by the transferable load of node i in period t.

4. A method for coordinated voltage regulation of active and reactive power in a distribution network for large-scale aquaculture according to any one of claim 3, characterized in that, The transferable load of node i refers to the automatic feeding equipment and water quality regulation equipment of node i.

5. A method for coordinated voltage regulation of active and reactive power in a distribution network for large-scale aquaculture according to any one of claims 1, characterized in that, In step S2, the participation demand response constraints of the aerator equipment are as follows: Among them, represents the single interruption duration of the aerator at node i, represents whether the aerator at node i is interrupted, represents the maximum interruption duration of the aerator, represents the maximum number of interruptions of the aerator, represents the active power load reduced by the aerator at node i, represents the maximum active power of the aerator, represents the reactive power load reduced by the aerator at node i, is the power factor angle of the aerator.

6. A method for coordinated voltage regulation of active and reactive power in a distribution network for large-scale aquaculture according to any one of claims 1, characterized in that, In step S2, the participation demand response constraints of the greenhouse aquaculture heating equipment are as follows: Among them, τ wat (t) is the temperature of the aquaculture water body in the t period, are the minimum and maximum temperature requirements of the aquaculture water body, and Δh pro (t) represents the heat reduction provided by the heat pump when the temperature of the aquaculture water body drops by Δτ, represents the active load reduced by greenhouse aquaculture at node i in the t period, represents the reactive load reduced by greenhouse aquaculture at node i in the t period, and η pum is the heat efficiency value of the heat pump, is the power factor angle of the heat pump.

7. A method for coordinated active and reactive voltage regulation of a distribution network in large-scale aquaculture according to claim 1, characterized in that, In step S3, the model with the minimum node voltage fluctuation is: where \(f\) is the objective function, is the voltage magnitude of node \(i\) at time period \(t\), is the reference voltage of the distribution network, \(N\) is the number of nodes in the distribution network, and \(T\) is the total scheduling time.

8. A method for coordinated active and reactive voltage regulation of a distribution network in large-scale aquaculture according to claim 7, characterized in that, In step S3, the constraint conditions are as follows: The constraint condition of the power flow equation is: Among them, and are the active powers of the power supply, photovoltaic, energy storage, and load of the i-th node at time t, respectively; and are the reactive powers of the power supply, photovoltaic, reactive power compensation device, and load of the i-th node at time t, respectively; G ij , B ij and δ ij are the conductance, reactance, and phase angle between nodes i and j, respectively, is the voltage amplitude of node j at time t; The constraint condition of the load demand is: Among them, represents the total active power load and total reactive power load of node i at time t, represents the actual active power load of the aquaculture equipment of node i at time t after implementing demand response, represents the remaining active power load of node i at time t, represents the actual reactive power load of the aquaculture equipment of node i at time t after implementing demand response, represents the remaining active power load of node i at time t; The constraint condition of the photovoltaic output is: Among them, represents the maximum apparent, reactive, and active power of the photovoltaic at node i, represents the reactive and active power of the photovoltaic at node i at time t; The constraint condition of the reactive power compensation device is: Among them, represents the maximum and minimum reactive powers of the reactive power compensation device connected to node i, represents the reactive power of the reactive power compensation device at node i in the t-th period; The constraint condition of the energy storage is: Among them, represents the state of charge of the energy storage of node i at time t, represents that the energy storage is in a discharging state, represents the charging power and discharging power of the energy storage of node i at time t, η cha and η dis represent the charging and discharging efficiencies of the energy storage, represent the maximum charging power and minimum charging power of the energy storage of node i, represent the maximum and minimum states of charge of the energy storage of node i; The constraint condition of the node voltage is: Among them, represents the minimum and maximum values of the voltage amplitude of node i, represents the voltage amplitude of node j at time t.

9. A computer device, comprising a memory and a processor, characterized in that: The memory stores a computer program, and when the processor executes the computer program, it realizes a method for coordinated active and reactive power voltage regulation of a distribution network for large-scale aquaculture described in any one of claims 1-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute a method for coordinated active and reactive power voltage regulation of a distribution network for large-scale aquaculture described in any one of claims 1-8.

Images