A method and device for controlling an island microgrid containing a seawater desalination load

Abstract

The present invention relates to a method and device for controlling an island microgrid containing a seawater desalination load, comprising: determining an upper / lower limit reference value for the electric power consumption of the seawater desalination load on the island at the current moment based on the water storage capacity of a reservoir corresponding to the seawater desalination load on the island at the current moment and the water demand of water users; and correcting the reference value using a characteristic sequence of the seawater desalination load at historical moments on the island to obtain the upper / lower limit values ​​for the electric power consumption of the seawater desalination load on the island at the current moment; and dispatching and controlling the island microgrid based on the obtained output power of a new energy generator set on the island at the current moment and the upper / lower limit values ​​for the electric power consumption of the seawater desalination load on the island at the current moment. The present invention can effectively solve the problem of multi-energy complementary consumption in a microgrid containing a seawater desalination load, minimize the operating time of a traditional generator set, and improve the stability and economy of the microgrid.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy technology, and in particular to a method and device for controlling an island microgrid containing a seawater desalination load. Background Art

[0002] Energy is the cornerstone of modern social progress and technological advancement. With the continuous development of the economy and society, the demand for electricity is growing. To achieve sustainable social and economic development, the primary challenge is the rational and efficient development of various energy sources. To meet this growing demand for electricity, consumption of non-renewable energy sources such as oil, natural gas, and coal has steadily increased, not only consuming significant amounts of non-renewable resources but also creating significant environmental problems. New renewable energy sources such as solar, wind, and ocean energy can address the conflict between humanity's growing demand for electricity and the increasingly depleted traditional fossil fuels and environmental issues.

[0003] In microgrids in coastal areas, on the one hand, the development speed of seawater desalination load is getting faster and faster, and the load demand of microgrids is increasing, which seriously affects the load balance of microgrids; on the other hand, coastal areas have rich new energy advantages, and distributed renewable energy such as clean and pollution-free solar energy, wind energy and tidal energy has great development potential; therefore, the full and reasonable development and utilization of microgrids in coastal areas, how to carry out multi-energy complementary consumption in microgrids and improve the stability of microgrids are issues that need to be urgently addressed in this field. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a method and device for controlling an island microgrid containing a seawater desalination load, which utilizes the upper / lower limit values ​​of the power consumption of the seawater desalination load and the output power of the new energy unit of the island microgrid to dispatch and control the island microgrid. This can effectively solve the problem of multi-energy complementary consumption of the microgrid containing the seawater desalination load, minimize the operating time of the traditional generator set, and improve the stability and economy of the microgrid.

[0005] The purpose of the present invention is achieved by adopting the following technical solutions:

[0006] The present invention provides a method for controlling an island microgrid containing a seawater desalination load, wherein the method comprises:

[0007] Determine the upper / lower limit reference value of the electric power consumption of the seawater desalination load on the island at the current moment according to the water storage capacity of the reservoir corresponding to the seawater desalination load on the island at the current moment and the water demand of the water users;

[0008] Using the characteristic sequence of the seawater desalination load at the historical moment on the island, the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island is corrected to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island;

[0009] Obtain the output power of the new energy generator set on the island at the current moment, and perform scheduling control on the island microgrid based on the output power of the new energy generator set on the island at the current moment and the upper / lower limit of the power consumption of the seawater desalination load on the island at the current moment;

[0010] Among them, the characteristic sequence of the seawater desalination load at the historical moment on the island includes: the normalized value of the ambient temperature of the seawater desalination load at the historical moment, the normalized value of the seawater consumption of the seawater desalination load at the historical moment, the normalized value of the seawater production of the seawater desalination load at the historical moment, the normalized value of the electricity power of the seawater desalination load at the historical moment, the normalized value of the seawater desalination efficiency of the seawater desalination load at the historical moment and the normalized value of the water demand of the island residents at the historical moment.

[0011] Preferably, the determining of the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water user includes:

[0012] Determine the upper limit reference value of the current seawater desalination load power consumption on the island according to the following formula

[0013]

[0014] Where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N des is the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0015] Determine the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment by the following formula

[0016]

[0017] Preferably, the method of using the characteristic sequence of the seawater desalination load at the historical moment on the island to correct the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island includes:

[0018] Determine the upper / lower limit correction value of the electric power consumption of the seawater desalination load at the current moment on the island based on the characteristic sequence of the seawater desalination load at the historical moment on the island;

[0019] like but otherwise like but otherwise

[0020] in, is the upper limit reference value of the power consumption of the seawater desalination load on the island at the current moment, is the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment, is the upper limit correction value of the power consumption of the seawater desalination load on the island at the current moment, P is the lower limit correction value of the power consumption of the seawater desalination load in the island at the current moment, des_max is the upper limit of the power consumption of the seawater desalination load in the island at the current moment, P des_min It is the lower limit of the power consumption of the seawater desalination load on the island at the current moment.

[0021] Furthermore, the determining of the upper / lower limit correction value of the electric power consumption of the seawater desalination load at the current moment on the island based on the characteristic sequence of the seawater desalination load at the historical moment on the island includes:

[0022] The characteristic sequence of the seawater desalination load at the current moment on the island is used to filter the characteristic sequence of the seawater desalination load at the historical moment on the island to obtain the screening result;

[0023] Perform morphological clustering on the characteristic sequences of seawater desalination loads at historical moments in the islands in the screening results;

[0024] The LightGBM algorithm is used to obtain the power curve corresponding to the morphological clustering result, and the maximum power value and the minimum power value in the power curve are respectively used as the upper / lower limit correction values ​​of the electric power consumption of the seawater desalination load in the island at the current moment.

[0025] Furthermore, the characteristic sequence of the seawater desalination load at the current moment in the island is used to filter the characteristic sequence of the seawater desalination load at the historical moment in the island to obtain the filtering result, including:

[0026] Obtain the difference sequence between the characteristic sequence of the seawater desalination load at the current moment in the island and the characteristic sequence of the seawater desalination load at each historical moment in the island;

[0027] Get the maximum value Δ in all difference sequences max and minimum Δ min ;

[0028] According to the maximum value Δ max and minimum value Δ min Calculate the grey correlation between the characteristic sequence of the seawater desalination load at the current moment on the island and the characteristic sequence of the seawater desalination load at each historical moment on the island;

[0029] The characteristic sequences of seawater desalination loads at historical moments in N islands with the largest grey correlation are selected as the screening results;

[0030] The grey correlation degree γ(X0,X m ):

[0031]

[0032] Where m∈[1,M], M is the total number of characteristic sequences of the seawater desalination load in the island at historical moments, M≥N, k∈[1,K], K is the total number of eigenvalues ​​in the characteristic sequence of the seawater desalination load, X0 is the characteristic sequence of the seawater desalination load at the current moment in the island, X m is the characteristic sequence of seawater desalination load at the mth historical moment in the island, ρ is the resolution coefficient, Δ m0 (k) is the difference between the kth eigenvalue in the characteristic sequence of the seawater desalination load at the current moment on the island and the kth eigenvalue in the characteristic sequence of the seawater desalination load at the mth historical moment on the island.

[0033] Furthermore, the morphological clustering of the characteristic sequences of the seawater desalination loads at historical moments in the islands in the screening results includes:

[0034] The characteristic sequences of seawater desalination load at two historical moments with the largest cosine similarity coefficient in the screening results are grouped into one category;

[0035] Among them, the characteristic sequence X of the seawater desalination load at the i-th historical moment in the island in the screening results is determined as follows: i The characteristic sequence X of the seawater desalination load at the jth historical moment in the screening results j The cosine similarity coefficient cos(X i ,X j ):

[0036]

[0037] Where, i, j∈[1,N], i≠j, k∈[1,K], K is the total number of eigenvalues ​​in the characteristic sequence of seawater desalination load, x i (k) is the characteristic sequence X of the seawater desalination load at the i-th historical moment in the island in the screening results i The kth eigenvalue in x j (k) is the characteristic sequence X of the seawater desalination load at the jth historical moment in the island in the screening results j The kth eigenvalue in .

[0038] Preferably, the controlling of the island microgrid according to the output power of the new energy generator set in the island at the current moment and the upper / lower limit of the power consumption of the seawater desalination load in the island at the current moment includes:

[0039] Obtain the difference P between the output power of the new energy generator set and the uncontrollable load power at the current moment on the island dif ;

[0040] If P dif =P des_min , then start the seawater desalination load and control the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the current seawater desalination load on the island and the water demand of the water users on the island at the current moment, without starting the diesel generator set and the battery;

[0041] If P des_min <P dif <P des_max , then start the seawater desalination load and control the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment in the island and the power of the uncontrollable load, without starting the diesel generator set and the battery;

[0042] If P dif ≥P des_max , then start the seawater desalination load and control the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment on the island and the power of the uncontrollable load, start the battery charging and control the battery charging power according to the working power of the seawater desalination load at the current moment on the island, and do not start the diesel generator set;

[0043] If P dif <P des_min , then start the seawater desalination load and control the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment in the island and the water demand of the water users at the current moment in the island. Start the battery to discharge and control the discharge power of the battery according to the difference between the output power of the new energy generator set at the current moment in the island and the power of the uncontrollable load. When Pd ≥P d_max When the power is on, the diesel generator set is started and the output power of the diesel generator set is controlled according to the discharge power of the battery;

[0044] Among them, P des_max is the upper limit of the power consumption of the seawater desalination load in the island at the current moment, P des_min is the lower limit of the power consumption of the seawater desalination load in the island at the current moment, P d is the discharge power of the battery, P d_max is the maximum discharge power of the battery.

[0045] Furthermore, the difference P between the output power of the new energy generator set and the uncontrollable load power at the current moment in the island is obtained as follows: dif :

[0046] P dif =P PV +P W -P load

[0047] Where, P W is the output power of the wind turbine generator set on the island at the current moment, P PV is the output power of the photovoltaic generator set in the island at the current moment, P load is the power of the uncontrollable load in the island at the current moment.

[0048] Furthermore, the controlling of the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users at the current moment on the island includes:

[0049] Determine the working power P of the seawater desalination load according to the following formula des1 :

[0050]

[0051] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users on the island at the current moment, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0052] Furthermore, the method of controlling the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment and the power of the uncontrollable load on the island includes:

[0053] Determine the working power P of the seawater desalination load according to the following formula des2 :

[0054]

[0055] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where round(·) is the rounding function.

[0056] Furthermore, the controlling of the working power of the seawater desalination load according to the total number of seawater desalination units in the seawater desalination load at the current moment on the island includes:

[0057] Determine the working power P of the seawater desalination load according to the following formula des3 :

[0058] P des3 =N des3 P des,e

[0059] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where N des3 =N des_max , N des_max is the total number of seawater desalination units in the seawater desalination load;

[0060] The method of controlling the charging power of the battery according to the working power of the seawater desalination load at the current moment on the island includes:

[0061] Determine the battery charging power P according to the following formula c :

[0062] P c =P dif -P des3

[0063] If P c >P c_max , then P c =P c_max , where P c_max =min[C dN (Soh max -Soh),P c,e ], P c_max is the maximum chargeable power of the battery, C dN is the rated capacity of the battery, Soh maxis the upper limit of the battery state of charge, Soh is the current state of charge of the battery, P c,e is the rated charging power of the battery.

[0064] Furthermore, the controlling of the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users at the current moment on the island includes:

[0065] Press the formula to control the working power P of the seawater desalination load des4 :

[0066]

[0067] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N des is the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0068] The method of controlling the discharge power of the battery according to the difference between the output power of the new energy generator set at the current moment on the island and the uncontrollable load power includes:

[0069] Determine the battery discharge power P according to the following formula d :

[0070] P d =P des_min -P dif

[0071] If P d >P d_max , then P d =P d_max ;

[0072] The method of controlling the output power of the diesel generator set according to the discharge power of the battery comprises:

[0073] Determine the output power P of the diesel generator set according to the following formula dg :

[0074] P dg =P d -P d_max

[0075] Among them, if P dg <0.3×P dgN , then P dg =0.3×P dgN , if P dg >P dgN , then P dg =P dgN , P dgN is the rated output power of the diesel generator set.

[0076] Furthermore, the maximum discharge power P of the battery is determined by the following formula: d_max :

[0077] P d_max =min[C dN (Soh-Soh min ),P d,e ]

[0078] Where C dN is the rated capacity of the battery, Soh is the current state of charge of the battery, Soh min is the upper limit of the battery state of charge, P d,e is the rated discharge power of the battery.

[0079] Based on the same inventive concept, the present invention also provides an island microgrid control device containing a seawater desalination load, wherein the improvement is that the device comprises:

[0080] The first determining unit is configured to determine an upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island according to the water storage capacity of the water reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water user;

[0081] The second determining unit is configured to modify the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island by using the characteristic sequence of the seawater desalination load at the historical moment on the island, so as to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island;

[0082] A control unit is configured to obtain the output power of the new energy generator set on the island at the current moment, and to perform scheduling control on the island microgrid based on the output power of the new energy generator set on the island at the current moment and the upper / lower limit of the power consumption of the seawater desalination load on the island at the current moment;

[0083] Among them, the characteristic sequence of the seawater desalination load at the historical moment on the island includes: the normalized value of the ambient temperature of the seawater desalination load at the historical moment, the normalized value of the seawater consumption of the seawater desalination load at the historical moment, the normalized value of the seawater production of the seawater desalination load at the historical moment, the normalized value of the electricity power of the seawater desalination load at the historical moment, the normalized value of the seawater desalination efficiency of the seawater desalination load at the historical moment and the normalized value of the water demand of the island residents at the historical moment.

[0084] Compared with the closest prior art, the present invention has the following beneficial effects:

[0085] The present invention provides a method and device for controlling an island microgrid containing a seawater desalination load. The method and device determine the upper / lower limit reference value of the electric power of the seawater desalination load at the current moment on the island according to the water storage capacity of the water reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water user; use the characteristic sequence of the seawater desalination load at the historical moment on the island to correct the upper / lower limit reference value of the electric power of the seawater desalination load at the current moment on the island, and obtain the upper / lower limit value of the electric power of the seawater desalination load at the current moment on the island; obtain the output power of the new energy generator set at the current moment on the island, and according to the output power of the new energy generator set at the current moment on the island and the The upper / lower limit of the power consumption of the seawater desalination load on the island at the current moment is used to dispatch and control the island microgrid; the present invention uses the obtained upper / lower limit of the power consumption of the seawater desalination load and the output power of the new energy unit of the island microgrid to control the power of the seawater desalination unit, battery and diesel generator set of the seawater desalination load in the island microgrid, so that the battery and diesel generator set can be used as energy supplements when the new energy generator set cannot meet the load demand, further meeting the seawater desalination load demand, effectively solving the multi-energy complementary consumption problem of the microgrid containing the seawater desalination load, reducing the operating time of the diesel generator set as much as possible, and improving the stability and economy of the microgrid. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1 This is a flow chart of the island microgrid control method containing seawater desalination loads according to the present invention;

[0087] Figure 2 It is a schematic diagram of the island microgrid control device containing seawater desalination load of the present invention. DETAILED DESCRIPTION

[0088] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0089] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0090] The present invention provides a method for controlling an island microgrid containing a seawater desalination load. Figure 1 As shown, the method includes:

[0091] Determine the upper / lower limit reference value of the electric power consumption of the seawater desalination load on the island at the current moment according to the water storage capacity of the reservoir corresponding to the seawater desalination load on the island at the current moment and the water demand of the water users;

[0092] Using the characteristic sequence of the seawater desalination load at the historical moment on the island, the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island is corrected to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island;

[0093] Obtain the output power of the new energy generator set on the island at the current moment, and perform scheduling control on the island microgrid based on the output power of the new energy generator set on the island at the current moment and the upper / lower limit of the power consumption of the seawater desalination load on the island at the current moment;

[0094] Among them, the characteristic sequence of the seawater desalination load at the historical moment on the island includes: the normalized value of the ambient temperature of the seawater desalination load at the historical moment, the normalized value of the seawater consumption of the seawater desalination load at the historical moment, the normalized value of the seawater production of the seawater desalination load at the historical moment, the normalized value of the electricity power of the seawater desalination load at the historical moment, the normalized value of the seawater desalination efficiency of the seawater desalination load at the historical moment and the normalized value of the water demand of the island residents at the historical moment.

[0095] In an embodiment of the present invention, the above-mentioned determination of the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island based on the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water user includes:

[0096] Determine the upper limit reference value of the current seawater desalination load power consumption on the island according to the following formula

[0097]

[0098] Where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q wis the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N des is the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0099] Determine the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment by the following formula

[0100]

[0101] In an embodiment of the present invention, the above-mentioned method of using the characteristic sequence of the seawater desalination load at the historical moment on the island to correct the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island includes:

[0102] Determine the upper / lower limit correction value of the electric power consumption of the seawater desalination load at the current moment on the island based on the characteristic sequence of the seawater desalination load at the historical moment on the island;

[0103] like but otherwise like but otherwise

[0104] in, is the upper limit reference value of the power consumption of the seawater desalination load on the island at the current moment, is the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment, is the upper limit correction value of the power consumption of the seawater desalination load on the island at the current moment, P is the lower limit correction value of the power consumption of the seawater desalination load in the island at the current moment, des_max is the upper limit of the power consumption of the seawater desalination load in the island at the current moment, P des_min It is the lower limit of the power consumption of the seawater desalination load on the island at the current moment.

[0105] Furthermore, the determining of the upper / lower limit correction value of the electric power consumption of the seawater desalination load at the current moment on the island based on the characteristic sequence of the seawater desalination load at the historical moment on the island includes:

[0106] The characteristic sequence of the seawater desalination load at the current moment on the island is used to filter the characteristic sequence of the seawater desalination load at the historical moment on the island to obtain the screening result;

[0107] Perform morphological clustering on the characteristic sequences of seawater desalination loads at historical moments in the islands in the screening results;

[0108] The LightGBM algorithm is used to obtain the power curve corresponding to the morphological clustering result, and the maximum power value and the minimum power value in the power curve are respectively used as the upper / lower limit correction values ​​of the electric power consumption of the seawater desalination load in the island at the current moment.

[0109] Among them, the characteristic sequence of the seawater desalination load on the island at the current moment includes: the normalized value of the ambient temperature of the seawater desalination load at the current moment, the normalized value of the seawater consumption of the seawater desalination load at the current moment, the normalized value of the seawater production of the seawater desalination load at the current moment, the normalized value of the electric power consumption of the seawater desalination load at the current moment, the normalized value of the seawater desalination efficiency of the seawater desalination load at the current moment and the normalized value of the water demand of the island residents at the current moment.

[0110] Furthermore, the characteristic sequence of the seawater desalination load at the current moment in the island is used to filter the characteristic sequence of the seawater desalination load at the historical moment in the island to obtain the filtering result, including:

[0111] Obtain the difference sequence between the characteristic sequence of the seawater desalination load at the current moment in the island and the characteristic sequence of the seawater desalination load at each historical moment in the island;

[0112] Get the maximum value Δ in all difference sequences max and minimum value Δ min ;

[0113] According to the maximum value Δ max and minimum value Δ min Calculate the grey correlation between the characteristic sequence of the seawater desalination load at the current moment on the island and the characteristic sequence of the seawater desalination load at each historical moment on the island;

[0114] The characteristic sequences of seawater desalination loads at historical moments in N islands with the largest grey correlation are selected as the screening results;

[0115] The grey correlation degree γ(X0,X m ):

[0116]

[0117] Where m∈[1,M], M is the total number of characteristic sequences of the seawater desalination load in the island at historical moments, M≥N, k∈[1,K], K is the total number of eigenvalues ​​in the characteristic sequence of the seawater desalination load, X0 is the characteristic sequence of the seawater desalination load at the current moment in the island, X m is the characteristic sequence of seawater desalination load at the mth historical moment in the island, ρ is the resolution coefficient, ρ = 0.5, Δ m0 (k) is the difference between the kth eigenvalue in the characteristic sequence of the seawater desalination load at the current moment on the island and the kth eigenvalue in the characteristic sequence of the seawater desalination load at the mth historical moment on the island.

[0118] Furthermore, the morphological clustering of the characteristic sequences of the seawater desalination loads at historical moments in the islands in the screening results includes:

[0119] The characteristic sequences of seawater desalination load at two historical moments with the largest cosine similarity coefficient in the screening results are grouped into one category;

[0120] Among them, the characteristic sequence X of the seawater desalination load at the i-th historical moment in the island in the screening results is determined as follows: i The characteristic sequence X of the seawater desalination load at the jth historical moment in the screening results j The cosine similarity coefficient cos(X i ,X j ):

[0121]

[0122] Where, i, j∈[1,N], i≠j, k∈[1,K], K is the total number of eigenvalues ​​in the characteristic sequence of seawater desalination load, x i (k) is the characteristic sequence X of the seawater desalination load at the i-th historical moment in the island in the screening results i The kth eigenvalue in x j (k) is the characteristic sequence X of the seawater desalination load at the jth historical moment in the island in the screening results j The kth eigenvalue in .

[0123] In an embodiment of the present invention, the control of the island microgrid based on the output power of the new energy generator set at the current moment in the island and the upper / lower limit of the power consumption of the seawater desalination load at the current moment in the island includes:

[0124] Obtain the difference P between the output power of the new energy generator set and the uncontrollable load power at the current moment on the island dif ;

[0125] If P dif =P des_min, then start the seawater desalination load and control the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the current seawater desalination load on the island and the water demand of the water users on the island at the current moment, without starting the diesel generator set and the battery;

[0126] If P des_min <P dif <P des_max , then start the seawater desalination load and control the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment in the island and the power of the uncontrollable load, without starting the diesel generator set and the battery;

[0127] If P dif ≥P des_max , then start the seawater desalination load and control the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment on the island and the power of the uncontrollable load, start the battery charging and control the battery charging power according to the working power of the seawater desalination load at the current moment on the island, and do not start the diesel generator set;

[0128] If P dif <P des_min , then start the seawater desalination load and control the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment in the island and the water demand of the water users at the current moment in the island. Start the battery to discharge and control the discharge power of the battery according to the difference between the output power of the new energy generator set at the current moment in the island and the power of the uncontrollable load. When P d ≥P d_max When the power is on, the diesel generator set is started and the output power of the diesel generator set is controlled according to the discharge power of the battery;

[0129] Among them, P des_max is the upper limit of the power consumption of the seawater desalination load in the island at the current moment, P des_min is the lower limit of the power consumption of the seawater desalination load in the island at the current moment, P d is the discharge power of the battery, P d_max is the maximum discharge power of the battery.

[0130] Furthermore, the difference P between the output power of the new energy generator set and the uncontrollable load power at the current moment in the island is obtained as follows: dif :

[0131] P dif =P PV +P W -P load

[0132] Where, P Wis the output power of the wind turbine generator set on the island at the current moment, P PV is the output power of the photovoltaic generator set in the island at the current moment, P load is the power of the uncontrollable load in the island at the current moment.

[0133] Furthermore, the controlling of the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users at the current moment on the island includes:

[0134] Determine the working power P of the seawater desalination load according to the following formula des1 :

[0135]

[0136] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users on the island at the current moment, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0137] Furthermore, the method of controlling the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment and the power of the uncontrollable load on the island includes:

[0138] Determine the working power P of the seawater desalination load according to the following formula des2 :

[0139]

[0140] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where round(·) is the rounding function.

[0141] Furthermore, the controlling of the working power of the seawater desalination load according to the total number of seawater desalination units in the seawater desalination load at the current moment on the island includes:

[0142] Determine the working power P of the seawater desalination load according to the following formula des3 :

[0143] P des3 =N des3 P des,e

[0144] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where N des3 =N des_max , N des_max is the total number of seawater desalination units in the seawater desalination load;

[0145] The method of controlling the charging power of the battery according to the working power of the seawater desalination load at the current moment on the island includes:

[0146] Determine the battery charging power P according to the following formula c :

[0147] P c =P dif -P des3

[0148] If P c >P c_max , then P c =P c_max , where P c_max =min[C dN (Soh max -Soh),P c,e ], P c_max is the maximum chargeable power of the battery, C dN is the rated capacity of the battery, Soh max is the upper limit of the battery state of charge, Soh is the current state of charge of the battery, P c,e is the rated charging power of the battery.

[0149] Furthermore, the controlling of the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users at the current moment on the island includes:

[0150] Press the formula to control the working power P of the seawater desalination load des4 :

[0151]

[0152] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N desis the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0153] The method of controlling the discharge power of the battery according to the difference between the output power of the new energy generator set at the current moment on the island and the uncontrollable load power includes:

[0154] Determine the battery discharge power P according to the following formula d :

[0155] P d =P des_min -P dif

[0156] If P d >P d_max , then P d =P d_max ;

[0157] The method of controlling the output power of the diesel generator set according to the discharge power of the battery comprises:

[0158] Determine the output power P of the diesel generator set according to the following formula dg :

[0159] P dg =P d -P d_max

[0160] Among them, if P dg <0.3×P dgN , then P dg =0.3×P dgN , if P dg >P dgN , then P dg =P dgN , P dgN is the rated output power of the diesel generator set.

[0161] Furthermore, the maximum discharge power P of the battery is determined by the following formula: d_max :

[0162] P d_max =min[C dN (Soh-Soh min ),P d,e ]

[0163] Where C dNis the rated capacity of the battery, Soh is the current state of charge of the battery, Soh min is the upper limit of the battery state of charge, P d,e is the rated discharge power of the battery.

[0164] Based on the same inventive concept, the present invention also provides an island microgrid control device containing a seawater desalination load, such as Figure 2 As shown, the device includes:

[0165] The first determining unit is configured to determine an upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island according to the water storage capacity of the water reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water user;

[0166] The second determining unit is configured to modify the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island by using the characteristic sequence of the seawater desalination load at the historical moment on the island, so as to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island;

[0167] A control unit is configured to obtain the output power of the new energy generator set on the island at the current moment, and to perform scheduling control on the island microgrid based on the output power of the new energy generator set on the island at the current moment and the upper / lower limit of the power consumption of the seawater desalination load on the island at the current moment;

[0168] Among them, the characteristic sequence of the seawater desalination load at the historical moment on the island includes: the normalized value of the ambient temperature of the seawater desalination load at the historical moment, the normalized value of the seawater consumption of the seawater desalination load at the historical moment, the normalized value of the seawater production of the seawater desalination load at the historical moment, the normalized value of the electricity power of the seawater desalination load at the historical moment, the normalized value of the seawater desalination efficiency of the seawater desalination load at the historical moment and the normalized value of the water demand of the island residents at the historical moment.

[0169] The first determining unit is specifically configured to:

[0170] Determine the upper limit reference value of the current seawater desalination load power consumption on the island according to the following formula

[0171]

[0172] Where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N desis the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0173] Determine the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment by the following formula

[0174]

[0175] The second determining unit is specifically configured to:

[0176] Determine the upper / lower limit correction value of the electric power consumption of the seawater desalination load at the current moment on the island based on the characteristic sequence of the seawater desalination load at the historical moment on the island;

[0177] like but otherwise like but otherwise

[0178] in, is the upper limit reference value of the power consumption of the seawater desalination load on the island at the current moment, is the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment, is the upper limit correction value of the power consumption of the seawater desalination load on the island at the current moment, P is the lower limit correction value of the power consumption of the seawater desalination load in the island at the current moment, des_max is the upper limit of the power consumption of the seawater desalination load in the island at the current moment, P des_min It is the lower limit of the power consumption of the seawater desalination load on the island at the current moment.

[0179] Furthermore, the determining of the upper / lower limit correction value of the electric power consumption of the seawater desalination load at the current moment on the island based on the characteristic sequence of the seawater desalination load at the historical moment on the island includes:

[0180] The characteristic sequence of the seawater desalination load at the current moment on the island is used to filter the characteristic sequence of the seawater desalination load at the historical moment on the island to obtain the screening result;

[0181] Perform morphological clustering on the characteristic sequences of seawater desalination loads at historical moments in the islands in the screening results;

[0182] The LightGBM algorithm is used to obtain the power curve corresponding to the morphological clustering result, and the maximum power value and the minimum power value in the power curve are respectively used as the upper / lower limit correction values ​​of the electric power consumption of the seawater desalination load in the island at the current moment.

[0183] Furthermore, the characteristic sequence of the seawater desalination load at the current moment in the island is used to filter the characteristic sequence of the seawater desalination load at the historical moment in the island to obtain the filtering result, including:

[0184] Obtain the difference sequence between the characteristic sequence of the seawater desalination load at the current moment in the island and the characteristic sequence of the seawater desalination load at each historical moment in the island;

[0185] Get the maximum value Δ in all difference sequences max and minimum value Δ min ;

[0186] According to the maximum value Δ max and minimum value Δ min Calculate the grey correlation between the characteristic sequence of the seawater desalination load at the current moment on the island and the characteristic sequence of the seawater desalination load at each historical moment on the island;

[0187] The characteristic sequences of seawater desalination loads at historical moments in N islands with the largest grey correlation are selected as the screening results;

[0188] The grey correlation degree γ(X0,X m ):

[0189]

[0190] Where m∈[1,M], M is the total number of characteristic sequences of the seawater desalination load in the island at historical moments, M≥N, k∈[1,K], K is the total number of eigenvalues ​​in the characteristic sequence of the seawater desalination load, X0 is the characteristic sequence of the seawater desalination load at the current moment in the island, X m is the characteristic sequence of seawater desalination load at the mth historical moment in the island, ρ is the resolution coefficient, Δ m0 (k) is the difference between the kth eigenvalue in the characteristic sequence of the seawater desalination load at the current moment on the island and the kth eigenvalue in the characteristic sequence of the seawater desalination load at the mth historical moment on the island.

[0191] Furthermore, the morphological clustering of the characteristic sequences of the seawater desalination loads at historical moments in the islands in the screening results includes:

[0192] The characteristic sequences of seawater desalination load at two historical moments with the largest cosine similarity coefficient in the screening results are grouped into one category;

[0193] Among them, the characteristic sequence X of the seawater desalination load at the i-th historical moment in the island in the screening results is determined as follows: i The characteristic sequence X of the seawater desalination load at the jth historical moment in the screening results j The cosine similarity coefficient cos(X i ,X j ):

[0194]

[0195] Where, i, j∈[1,N], i≠j, k∈[1,K], K is the total number of eigenvalues ​​in the characteristic sequence of seawater desalination load, x i (k) is the characteristic sequence X of the seawater desalination load at the i-th historical moment in the island in the screening results i The kth eigenvalue in x j (k) is the characteristic sequence X of the seawater desalination load at the jth historical moment in the island in the screening results j The kth eigenvalue in .

[0196] The control unit is specifically used for:

[0197] Obtain the difference P between the output power of the new energy generator set and the uncontrollable load power at the current moment on the island dif ;

[0198] If P dif =P des_min , then start the seawater desalination load and control the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the current seawater desalination load on the island and the water demand of the water users on the island at the current moment, without starting the diesel generator set and the battery;

[0199] If P des_min <P dif <P des_max , then start the seawater desalination load and control the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment in the island and the power of the uncontrollable load, without starting the diesel generator set and the battery;

[0200] If P dif ≥P des_max , then start the seawater desalination load and control the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment on the island and the power of the uncontrollable load, start the battery charging and control the battery charging power according to the working power of the seawater desalination load at the current moment on the island, and do not start the diesel generator set;

[0201] If P dif <P des_min, then start the seawater desalination load and control the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment in the island and the water demand of the water users at the current moment in the island. Start the battery to discharge and control the discharge power of the battery according to the difference between the output power of the new energy generator set at the current moment in the island and the power of the uncontrollable load. When P d ≥P d_max When the power is on, the diesel generator set is started and the output power of the diesel generator set is controlled according to the discharge power of the battery;

[0202] Among them, P des_max is the upper limit of the power consumption of the seawater desalination load in the island at the current moment, P des_min is the lower limit of the power consumption of the seawater desalination load in the island at the current moment, P d is the discharge power of the battery, P d_max is the maximum discharge power of the battery.

[0203] Furthermore, the difference P between the output power of the new energy generator set and the uncontrollable load power at the current moment in the island is obtained as follows: dif :

[0204] P dif =P PV +P W -P load

[0205] Where, P W is the output power of the wind turbine generator set on the island at the current moment, P PV is the output power of the photovoltaic generator set in the island at the current moment, P load is the power of the uncontrollable load in the island at the current moment.

[0206] Furthermore, the controlling of the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users at the current moment on the island includes:

[0207] Determine the working power P of the seawater desalination load according to the following formula des1 :

[0208]

[0209] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users on the island at the current moment, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, ηdes is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0210] Furthermore, the method of controlling the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment and the power of the uncontrollable load on the island includes:

[0211] Determine the working power P of the seawater desalination load according to the following formula des2 :

[0212]

[0213] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where round(·) is the rounding function.

[0214] Furthermore, the controlling of the working power of the seawater desalination load according to the total number of seawater desalination units in the seawater desalination load at the current moment on the island includes:

[0215] Determine the working power P of the seawater desalination load according to the following formula des3 :

[0216] P des3 =N des3 P des,e

[0217] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where N des3 =N des_max , N des_max is the total number of seawater desalination units in the seawater desalination load;

[0218] The method of controlling the charging power of the battery according to the working power of the seawater desalination load at the current moment on the island includes:

[0219] Determine the battery charging power P according to the following formula c :

[0220] P c =P dif -P des3

[0221] If P c >P c_max , then P c =P c_max , where P c_max =min[C dN (Soh max -Soh),Pc,e ], P c_max is the maximum chargeable power of the battery, C dN is the rated capacity of the battery, Soh max is the upper limit of the battery state of charge, Soh is the current state of charge of the battery, P c,e is the rated charging power of the battery.

[0222] Furthermore, the controlling of the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users at the current moment on the island includes:

[0223] Press the formula to control the working power P of the seawater desalination load des4 :

[0224]

[0225] Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N des is the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir;

[0226] The method of controlling the discharge power of the battery according to the difference between the output power of the new energy generator set at the current moment on the island and the uncontrollable load power includes:

[0227] Determine the battery discharge power P according to the following formula d :

[0228] P d =P des_min -P dif

[0229] If P d >P d_max , then P d =P d_max ;

[0230] The method of controlling the output power of the diesel generator set according to the discharge power of the battery comprises:

[0231] Determine the output power P of the diesel generator set according to the following formula dg :

[0232] P dg =P d -P d_max

[0233] Among them, if P dg <0.3×P dgN , then P dg =0.3×P dgN , if P dg >P dgN , then P dg =P dgN , P dgN is the rated output power of the diesel generator set.

[0234] Furthermore, the maximum discharge power P of the battery is determined by the following formula: d_max :

[0235] P d_max =min[C dN (Soh-Soh min ),P d,e ]

[0236] Where C dN is the rated capacity of the battery, Soh is the current state of charge of the battery, Soh min is the upper limit of the battery state of charge, P d,e is the rated discharge power of the battery.

[0237] In summary, the present invention provides a method and device for controlling an island microgrid containing a seawater desalination load, which determines the upper / lower reference value of the electric power of the seawater desalination load at the current moment on the island according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water user; uses the characteristic sequence of the seawater desalination load at the historical moment on the island to correct the upper / lower reference value of the electric power of the seawater desalination load at the current moment on the island, and obtains the upper / lower limit value of the electric power of the seawater desalination load at the current moment on the island; obtains the output power of the new energy generator set at the current moment on the island, and obtains the upper / lower limit value of the electric power of the new energy generator set at the current moment on the island according to the output power of the new energy generator set at the current moment on the island and The upper / lower limit of the power consumption of the seawater desalination load at the current moment in the island is used to dispatch and control the island microgrid; the present invention uses the obtained upper / lower limit of the power consumption of the seawater desalination load and the output power of the new energy unit of the island microgrid to control the power of the seawater desalination load, the desalination unit, the battery and the diesel generator set in the island microgrid, so that the battery and the diesel generator set can serve as energy supplements when the new energy generator set cannot meet the load demand, further meeting the seawater desalination load demand, and effectively solving the multi-energy complementary consumption of the microgrid containing the seawater desalination load, reducing the operating time of the diesel generator set as much as possible, and improving the stability and economy of the microgrid. It should be understood by those skilled in the art that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. 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 storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0238] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0239] These computer program instructions may 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 produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0240] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0241] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for controlling an island microgrid containing a seawater desalination load, characterized in that: The method comprises: The upper and lower limit reference values ​​of the electric power consumption of the seawater desalination load at the current moment on the island are determined based on the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users, including: Determine the upper limit reference value of the current seawater desalination load power consumption on the island according to the following formula Where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N des is the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir; Determine the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment by the following formula Using the characteristic sequence of the seawater desalination load at the historical moment on the island, the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island is corrected to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island; Obtain the output power of the new energy generator set on the island at the current moment, and perform scheduling control on the island microgrid based on the output power of the new energy generator set on the island at the current moment and the upper / lower limit of the power consumption of the seawater desalination load on the island at the current moment; Among them, the characteristic sequence of the seawater desalination load at the historical moment on the island includes: the normalized value of the ambient temperature of the seawater desalination load at the historical moment, the normalized value of the seawater consumption of the seawater desalination load at the historical moment, the normalized value of the seawater production of the seawater desalination load at the historical moment, the normalized value of the electricity power of the seawater desalination load at the historical moment, the normalized value of the seawater desalination efficiency of the seawater desalination load at the historical moment and the normalized value of the water demand of the island residents at the historical moment.

2. The method according to claim 1, wherein The method of using the characteristic sequence of the seawater desalination load at the historical moment on the island to correct the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island includes: Determine the upper / lower limit correction value of the electric power consumption of the seawater desalination load at the current moment on the island based on the characteristic sequence of the seawater desalination load at the historical moment on the island; like but otherwise like but otherwise in, is the upper limit reference value of the power consumption of the seawater desalination load on the island at the current moment, is the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment, is the upper limit correction value of the power consumption of the seawater desalination load on the island at the current moment, P is the lower limit correction value of the power consumption of the seawater desalination load in the island at the current moment, des_max is the upper limit of the power consumption of the seawater desalination load in the island at the current moment, P des_min It is the lower limit of the power consumption of the seawater desalination load on the island at the current moment.

3. The method according to claim 2, wherein The method of determining the upper / lower limit correction value of the electric power consumption of the seawater desalination load at the current moment on the island based on the characteristic sequence of the seawater desalination load at the historical moment on the island includes: The characteristic sequence of the seawater desalination load at the current moment on the island is used to filter the characteristic sequence of the seawater desalination load at the historical moment on the island to obtain the screening result; Perform morphological clustering on the characteristic sequences of seawater desalination loads at historical moments in the islands in the screening results; The LightGBM algorithm is used to obtain the power curve corresponding to the morphological clustering result, and the maximum power value and the minimum power value in the power curve are respectively used as the upper / lower limit correction values ​​of the electric power consumption of the seawater desalination load in the island at the current moment.

4. The method according to claim 3, wherein The method of using the characteristic sequence of the seawater desalination load at the current moment on the island to filter the characteristic sequence of the seawater desalination load at the historical moment on the island to obtain the filtering results includes: Obtain the difference sequence between the characteristic sequence of the seawater desalination load at the current moment in the island and the characteristic sequence of the seawater desalination load at each historical moment in the island; Get the maximum value Δ in all difference sequences max and minimum value Δ min ; According to the maximum value Δ max and minimum value Δ min Calculate the grey correlation between the characteristic sequence of the seawater desalination load at the current moment on the island and the characteristic sequence of the seawater desalination load at each historical moment on the island; The characteristic sequences of seawater desalination loads at historical moments in N islands with the largest grey correlation are selected as the screening results; The grey correlation degree γ(X0,X m ): Where m∈[1,M], M is the total number of characteristic sequences of the seawater desalination load in the island at historical moments, M≥N, k∈[1,K], K is the total number of eigenvalues ​​in the characteristic sequence of the seawater desalination load, X0 is the characteristic sequence of the seawater desalination load at the current moment in the island, X m is the characteristic sequence of seawater desalination load at the mth historical moment in the island, ρ is the resolution coefficient, Δ m0 (k) is the difference between the kth eigenvalue in the characteristic sequence of the seawater desalination load at the current moment on the island and the kth eigenvalue in the characteristic sequence of the seawater desalination load at the mth historical moment on the island.

5. The method according to claim 3, wherein The morphological clustering of the characteristic sequences of the seawater desalination loads at historical moments in the islands in the screening results includes: The characteristic sequences of seawater desalination load at two historical moments with the largest cosine similarity coefficient in the screening results are grouped into one category; Among them, the characteristic sequence X of the seawater desalination load at the i-th historical moment in the island in the screening results is determined as follows: i The characteristic sequence X of the seawater desalination load at the jth historical moment in the screening results j The cosine similarity coefficient cos(X i ,X j ): Where, i, j∈[1,N], i≠j, k∈[1,K], K is the total number of eigenvalues ​​in the characteristic sequence of seawater desalination load, x i (k) is the characteristic sequence X of the seawater desalination load at the i-th historical moment in the island in the screening results i The kth eigenvalue in x j (k) is the characteristic sequence X of the seawater desalination load at the jth historical moment in the island in the screening results j The kth eigenvalue in .

6. The method according to claim 1, wherein The controlling of the island microgrid according to the output power of the new energy generator set at the current moment in the island and the upper / lower limit of the power consumption of the seawater desalination load at the current moment in the island includes: Obtain the difference P between the output power of the new energy generator set and the uncontrollable load power at the current moment on the island dif ; If P dif =P des_min , then start the seawater desalination load and control the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the current seawater desalination load on the island and the water demand of the water users on the island at the current moment, without starting the diesel generator set and the battery; If P des_min <P dif <P des_max , then start the seawater desalination load and control the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment in the island and the power of the uncontrollable load, without starting the diesel generator set and the battery; If P dif ≥P des_max , then start the seawater desalination load and control the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment on the island and the power of the uncontrollable load, start the battery charging and control the battery charging power according to the working power of the seawater desalination load at the current moment on the island, and do not start the diesel generator set; If P dif <P des_min , then start the seawater desalination load and control the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment in the island and the water demand of the water users at the current moment in the island. Start the battery to discharge and control the discharge power of the battery according to the difference between the output power of the new energy generator set at the current moment in the island and the power of the uncontrollable load. When P d ≥P d_max When the power is on, the diesel generator set is started and the output power of the diesel generator set is controlled according to the discharge power of the battery; Among them, P des_max is the upper limit of the power consumption of the seawater desalination load in the island at the current moment, P des_min is the lower limit of the power consumption of the seawater desalination load in the island at the current moment, P d is the discharge power of the battery, P d_max is the maximum discharge power of the battery.

7. The method according to claim 6, wherein The difference P between the output power of the new energy generator set and the uncontrollable load power at the current moment in the island is obtained by the following formula: dif : P dif =P PV +P W -P load Where, P W is the output power of the wind turbine generator set on the island at the current moment, P PV is the output power of the photovoltaic generator set in the island at the current moment, P load is the power of the uncontrollable load in the island at the current moment.

8. The method according to claim 6, wherein The controlling of the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users at the current moment on the island includes: Determine the working power P of the seawater desalination load according to the following formula des1 : Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users on the island at the current moment, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir.

9. The method according to claim 6, wherein The method of controlling the working power of the seawater desalination load according to the difference between the output power of the new energy generator set at the current moment on the island and the power of the uncontrollable load includes: Determine the working power P of the seawater desalination load according to the following formula des2 : Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where round(·) is the rounding function.

10. The method according to claim 6, wherein The method of controlling the working power of the seawater desalination load according to the total number of seawater desalination units in the seawater desalination load at the current moment on the island includes: Determine the working power P of the seawater desalination load according to the following formula des3 : P des3 =N des3 P des,e Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, where N des3 =N des_max , N des_max is the total number of seawater desalination units in the seawater desalination load; The method of controlling the charging power of the battery according to the working power of the seawater desalination load at the current moment on the island includes: Determine the battery charging power P according to the following formula c : P c =P dif -P des3 If P c >P c_max , then P c =P c_max , where P c_max =min[C dN (Soh max -Soh),P c,e ], P c_max is the maximum chargeable power of the battery, C dN is the rated capacity of the battery, Soh max is the upper limit of the battery state of charge, Soh is the current state of charge of the battery, P c,e is the rated charging power of the battery.

11. The method according to claim 6, wherein The controlling of the working power of the seawater desalination load according to the water storage capacity of the reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water users at the current moment on the island includes: Press the formula to control the working power P of the seawater desalination load des4 : Where, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N des is the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir; The method of controlling the discharge power of the battery according to the difference between the output power of the new energy generator set at the current moment on the island and the uncontrollable load power includes: Determine the battery discharge power P according to the following formula d : P d =P des_min -P dif If P d >P d_max , then P d =P d_max ; The method of controlling the output power of the diesel generator set according to the discharge power of the battery comprises: Determine the output power P of the diesel generator set according to the following formula dg : P dg =P d -P d_max Among them, if P dg <0.3×P dgN , then P dg =0.3×P dgN , if P dg >P dgN , then P dg =P dgN , P dgN is the rated output power of the diesel generator set.

12. The method according to claim 6, wherein Determine the maximum discharge power P of the battery according to the following formula d_max : P d_max =min[C dN (Soh-Soh min ),P d,e ] Where C dN is the rated capacity of the battery, Soh is the current state of charge of the battery, Soh min is the upper limit of the battery state of charge, P d,e is the rated discharge power of the battery.

13. A control device for an island microgrid containing a seawater desalination load, characterized in that: The device comprises: The first determining unit is configured to determine an upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island according to the water storage capacity of the water reservoir corresponding to the seawater desalination load at the current moment on the island and the water demand of the water user; The first determining unit is specifically configured to: Determine the upper limit reference value of the current seawater desalination load power consumption on the island according to the following formula Where S des is the water storage capacity of the reservoir corresponding to the current desalination load on the island, Q w is the water demand of water users in the island at the current moment, P des,e is the rated power of the seawater desalination unit in the seawater desalination load, N des_max is the total number of seawater desalination units in the seawater desalination load, N des is the total number of desalination units that have been started in the desalination load, G des is the hourly water production of the seawater desalination unit in the seawater desalination load, η des is the working efficiency of the seawater desalination unit in the seawater desalination load, S des-max is the maximum water storage capacity of the reservoir, S des-min is the minimum water storage capacity of the reservoir; Determine the lower limit reference value of the power consumption of the seawater desalination load on the island at the current moment by the following formula The second determining unit is configured to modify the upper / lower limit reference value of the electric power consumption of the seawater desalination load at the current moment on the island by using the characteristic sequence of the seawater desalination load at the historical moment on the island, so as to obtain the upper / lower limit value of the electric power consumption of the seawater desalination load at the current moment on the island; A control unit is configured to obtain the output power of the new energy generator set on the island at the current moment, and to perform scheduling control on the island microgrid based on the output power of the new energy generator set on the island at the current moment and the upper / lower limit of the power consumption of the seawater desalination load on the island at the current moment; Among them, the characteristic sequence of the seawater desalination load at the historical moment on the island includes: the normalized value of the ambient temperature of the seawater desalination load at the historical moment, the normalized value of the seawater consumption of the seawater desalination load at the historical moment, the normalized value of the seawater production of the seawater desalination load at the historical moment, the normalized value of the electricity power of the seawater desalination load at the historical moment, the normalized value of the seawater desalination efficiency of the seawater desalination load at the historical moment and the normalized value of the water demand of the island residents at the historical moment.

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