Offshore wind power transmission and energy storage integrated system and method thereof, equipment and storage medium

Abstract

The invention relates to the technical field of wind power, and discloses an offshore wind power transmission and energy storage integrated system and method, equipment and a storage medium, and the system comprises an offshore charging station which is used for charging the electric energy generated by an offshore wind field into an electrolyte to obtain an electrified electrolyte; the ashore energy storage power station is used for storing electric energy discharged by the electrified electrolyte to a power grid and obtaining a non-electrified electrolyte; and the electrolyte conveying ship is used for conveying the electrified electrolyte loaded from the offshore charging station to the shore energy storage power station and conveying the non-electrified electrolyte to the offshore charging station. The problem that in the prior art, the economical efficiency of electric energy transmission of offshore wind power is poor is solved.

Description

Technical Field

[0001] The present invention relates to the field of wind power technology, and in particular to an offshore wind power transmission and energy storage integrated system and method, equipment and storage medium thereof. Background Art

[0002] Offshore wind energy is a clean energy resource with abundant reserves. As wind power technology matures, the installed capacity of offshore wind power is gradually expanding, and the cost is also decreasing. It is becoming an important part of the clean energy field and a key link in achieving sustainable development of low-carbon energy.

[0003] However, the transmission of offshore wind power relies on submarine cables and corresponding converging and boosting devices. This power transmission system has high construction costs and lacks flexibility in system layout. In particular, the construction of deep sea wind farms more than 100 kilometers offshore places higher technical requirements on cables and boosting stations, further reducing the economic efficiency of submarine cable transmission systems. Summary of the invention

[0004] In view of this, the present invention provides an offshore wind power transmission and energy storage integrated system and its method, equipment and storage medium to solve the problem of offshore wind power power transmission in the prior art.

[0005] In a first aspect, the present invention provides an offshore wind power transmission and energy storage integrated system, the system comprising:

[0006] An offshore charging station is used to charge the electric energy generated by the offshore wind farm into the electrolyte to obtain a charged electrolyte;

[0007] An onshore energy storage power station, used to store the electric energy discharged from the charged electrolyte into a power grid and obtain a non-charged electrolyte;

[0008] The electrolyte transport ship is used to transport the charged electrolyte loaded from the offshore charging station to the onshore energy storage power station, and to transport the non-charged electrolyte to the offshore charging station.

[0009] The present invention charges the electrolyte with the electric energy generated by wind power through an offshore charging station to obtain a charged electrolyte, and then transports the charged electrolyte to the shore through an electrolyte transport ship. The onshore energy storage power station stores the electric energy of the charged electrolyte in the power grid, and then transports the discharged non-charged electrolyte to the offshore charging station through the electrolyte transport ship, and the cycle is repeated. Therefore, there is no need to lay submarine cables, which greatly reduces costs.

[0010] In an optional embodiment, the system further comprises a cathode liquid tank and a cathode liquid tank, and the offshore charging station comprises: an offshore battery stack;

[0011] The offshore battery stack is connected to the cathode liquid tank and the cathode liquid tank respectively, and is used to store the electric energy generated at sea in the cathode liquid tank and the cathode liquid tank respectively;

[0012] The onshore energy storage power station includes: onshore battery stacks;

[0013] The battery stack on shore is connected to the cathode liquid tank and the cathode liquid tank respectively, and is used to store the electric energy of the cathode liquid tank and the cathode liquid tank;

[0014] The electrolyte transport ship is used to transport the cathode liquid tank and the cathode liquid tank.

[0015] In an optional embodiment, the positive electrode liquid tank includes: a non-charged positive electrode liquid tank and a charged positive electrode liquid tank, and the negative electrode liquid tank includes: a non-charged negative electrode liquid tank and a charged negative electrode liquid tank;

[0016] The offshore charging station also includes:

[0017] Offshore cathode reactor, offshore cathode reactor and cathode connection of offshore battery stack;

[0018] Offshore negative electrode reactor, offshore negative electrode reactor and negative electrode connection of offshore battery stack;

[0019] The offshore positive electrode reaction tank is connected to the non-charged positive electrode liquid tank and the charged positive electrode liquid tank respectively, and the offshore negative electrode reaction tank is connected to the non-charged negative electrode liquid tank and the charged negative electrode liquid tank respectively. The electrolyte in the non-charged positive electrode liquid tank enters the offshore positive electrode reaction tank, and the electrolyte in the non-charged negative electrode liquid tank enters the offshore negative electrode reaction tank, and is transferred to the charged positive electrode liquid tank and the charged negative electrode liquid tank after being charged.

[0020] Among them, the volume of the offshore positive electrode reaction tank and the offshore negative electrode reaction tank is smaller than the volume of the positive electrode liquid tank or the negative electrode liquid tank.

[0021] In an optional embodiment, the offshore charging station further includes:

[0022] a first control valve, wherein a first end of the first control valve is connected to a first end of an offshore cathode reaction tank, and a second end of the first control valve is connected to an electrically charged cathode liquid tank;

[0023] a second control valve, a first end of the second control valve being connected to a second end of the offshore cathode reaction tank, and a second end of the second control valve being connected to a non-electric cathode liquid tank;

[0024] a third control valve, wherein a first end of the third control valve is connected to a first end of the offshore negative electrode reaction tank, and a second end of the third control valve is connected to the charged negative electrode liquid tank;

[0025] a fourth control valve, wherein a first end of the fourth control valve is connected to a second end of the offshore cathode reaction tank, and a second end of the fourth control valve is connected to the non-electrode cathode liquid tank;

[0026] The first control valve and the second control valve are used to control the flow direction of the positive electrode electrolyte during charging;

[0027] The third control valve and the fourth control valve are used to control the flow direction of the negative electrode electrolyte during charging.

[0028] In an optional embodiment, the onshore energy storage power station further includes:

[0029] A positive electrode reaction tank on shore, a positive electrode connection between the positive electrode reaction tank on shore and the positive electrode of the battery stack on shore;

[0030] A negative electrode reaction tank on shore, a negative electrode connection between the negative electrode reaction tank on shore and the negative electrode of the battery stack on shore;

[0031] The positive electrode reaction tank on the shore is connected to the non-charged positive electrode liquid tank and the charged positive electrode liquid tank respectively, and the negative electrode reaction tank on the shore is connected to the non-charged negative electrode liquid tank and the charged negative electrode liquid tank respectively, the electrolyte in the charged positive electrode liquid tank enters the positive electrode reaction tank on the shore, and the electrolyte in the charged negative electrode liquid tank enters the negative electrode reaction tank on the shore, and is transmitted to the non-charged positive electrode liquid tank and the non-charged negative electrode liquid tank after discharge;

[0032] Among them, the volume of the onshore positive electrode reaction tank and the onshore negative electrode reaction tank is smaller than the volume of the positive electrode liquid tank or the negative electrode liquid tank.

[0033] In an optional embodiment, the offshore charging station further includes:

[0034] a fifth control valve, wherein a first end of the fifth control valve is connected to a first end of the positive electrode reaction tank on the shore, and a second end of the fifth control valve is connected to the charged positive electrode liquid tank;

[0035] a sixth control valve, wherein a first end of the sixth control valve is connected to a second end of the cathode reaction tank on the shore, and a second end of the sixth control valve is connected to the non-electrode cathode liquid tank;

[0036] a seventh control valve, wherein a first end of the seventh control valve is connected to a first end of the negative electrode reaction tank on the shore, and a second end of the seventh control valve is connected to the charged negative electrode liquid tank;

[0037] an eighth control valve, wherein a first end of the eighth control valve is connected to a second end of the negative electrode reaction tank on the shore, and a second end of the eighth control valve is connected to the non-electrode negative electrode liquid tank;

[0038] The fifth control valve and the sixth control valve are used to control the flow direction of the positive electrode electrolyte during discharge;

[0039] The seventh control valve and the eighth control valve are used to control the flow direction of the negative electrode electrolyte during charging.

[0040] In an optional embodiment, the system further includes:

[0041] The offshore wind power converging station is connected to the offshore charging station and is used to converge the electric energy generated at sea and send it to the offshore charging station.

[0042] In a second aspect, the present invention provides an offshore wind power transmission and energy storage method, which is applied to the above system and includes:

[0043] Controlling the offshore charging station to charge the electric energy generated by the offshore wind farm into the electrolyte to obtain a charged electrolyte;

[0044] The electrolyte transport vessel transports the charged electrolyte loaded from the offshore charging station to the onshore energy storage power station;

[0045] The onshore energy storage power station is controlled to store the electric energy discharged from the charged electrolyte into the power grid.

[0046] In an optional embodiment, the method further includes:

[0047] Open the second control valve and the fourth control valve, and close the first control valve and the third control valve, control the electrolyte of the non-electric cathode liquid tank to enter the offshore cathode reaction tank for charging, and control the electrolyte of the non-electric cathode liquid tank to enter the offshore cathode reaction tank for charging;

[0048] After charging is completed, close the second control valve and the fourth control valve, and open the first control valve and the third control valve to control the transfer of the charged electrolyte of the offshore positive electrode reaction tank to the charged positive electrode liquid tank, and control the transfer of the charged electrolyte of the offshore negative electrode reaction tank to the charged negative electrode liquid tank.

[0049] In a second aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the offshore wind power transmission and energy storage method of the above-mentioned first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0050] In a third aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the offshore wind power transmission and energy storage method of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0052] Figure 1 is a structural diagram of an offshore wind power transmission and energy storage integrated system according to an embodiment of the present invention;

[0053] Figure 2 is a schematic diagram of charging and discharging of an offshore wind power transmission and energy storage integrated system according to an embodiment of the present invention;

[0054] Figure 3 is a schematic diagram of offshore charging in an offshore wind power transmission and energy storage integrated system according to an embodiment of the present invention;

[0055] Figure 4 Schematic diagram of onshore discharge in an offshore wind power transmission and energy storage integrated system according to an embodiment of the present invention;

[0056] Figure 5 is another structural diagram of an offshore wind power transmission and energy storage integrated system according to an embodiment of the present invention;

[0057] Figure 6 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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 creative work are within the scope of protection of the present invention.

[0059] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0062] At present, the transmission of offshore wind power relies on submarine cables and corresponding converging and boosting devices. This power transmission system has high construction costs and lacks flexibility in system layout. In particular, the construction of deep sea wind farms more than 100 kilometers offshore places higher technical requirements on cables and boosting stations, further reducing the economic efficiency of submarine cable transmission systems.

[0063] In addition, the continuity of offshore wind power is poor and it is easily affected by weather factors, resulting in fluctuations in power generation, which has caused certain difficulties in connecting power generation to the grid and is also the main reason for abandonment. Based on the above factors, continuity and economic issues are also the main obstacles to the development of offshore wind power, especially deep sea wind power.

[0064] In this regard, this embodiment provides an offshore wind power transmission and energy storage integrated system, such as Figure 1 As shown, the system includes:

[0065] An offshore charging station is used to charge the electric energy generated by the offshore wind farm into the electrolyte to obtain a charged electrolyte;

[0066] An onshore energy storage power station is used to store the electric energy discharged from the charged electrolyte into the grid and obtain the uncharged electrolyte;

[0067] The electrolyte transfer vessel is used to transfer charged electrolyte loaded from the offshore charging station to the onshore energy storage power station, and to transfer uncharged electrolyte to the offshore charging station.

[0068] refer to Figure 1 , the offshore wind turbines convert wind energy into electrical energy and transmit it to the offshore charging station (i.e. Figure 1 The offshore charging station charges the electrolyte with electric energy to obtain charged electrolyte, and then transports the charged electrolyte to the shore via the electrolyte transport ship. Figure 1 The onshore liquid flow battery energy storage station) stores the electric energy of the charged electrolyte in the power grid, and then sends the discharged uncharged electrolyte to the offshore charging station via the electrolyte transport ship, and the cycle continues. As a result, there is no need to lay submarine cables, which greatly reduces costs.

[0069] The offshore charging station may specifically include an electrolyte charging device, which is connected to the offshore wind power generation group, receives the electric energy sent by the offshore wind power generation group, and charges the electrolyte through the electrolyte charging device. The onshore energy storage power station may specifically include an electrolyte discharge device, which is connected to the power grid, and discharges the electric energy in the transported electrolyte to the power grid through the electrolyte discharge device.

[0070] In some optional embodiments, such as Figure 2 As shown, the system also includes a cathode liquid tank and an anode liquid tank, and the offshore charging station includes: an offshore battery stack;

[0071] The offshore battery stack is connected to the cathode liquid tank and the cathode liquid tank respectively, and is used to store the electric energy generated at sea in the cathode liquid tank and the cathode liquid tank respectively;

[0072] The onshore energy storage power station includes: onshore battery stacks;

[0073] The battery stack on shore is connected to the cathode liquid tank and the cathode liquid tank respectively, and is used to store the electric energy of the cathode liquid tank and the cathode liquid tank;

[0074] The electrolyte transport ship is used to transport the cathode liquid tank and the cathode liquid tank.

[0075] refer to Figure 2 In this embodiment, the electrolyte can be charged and discharged by using an all-vanadium liquid flow battery. Figure 2 For a double-liquid tank all-vanadium flow battery, the SOC changes between 0 and 100%, which can be regarded as the VO 2+ and VO2 + The two ions transform into each other, and V 2+ and V 3+ The two ions transform into each other. When SOC decreases (i.e., discharge), the VO2 in the cathode liquid tank + Concentration decreases VO 2+ The concentration increases, and the V 2+ Concentration decrease V 3+ When SOC is 0% (i.e. fully discharged), the VO2 + The concentration reaches a minimum value, and V 2+ When the SOC rises (i.e. charging), the changes in the ion concentrations in the two tanks are opposite to those during discharge. When the SOC is 100% (i.e. fully charged), the VO in the cathode liquid tank 2+ The concentration reaches a minimum value, and V 3+ The concentration reaches a minimum.

[0076] Will be like Figure 2The double-liquid tank all-vanadium liquid flow battery shown is respectively arranged at an offshore charging station and an onshore energy storage power station, wherein the battery stack arranged at sea is an offshore battery stack, and the battery stack arranged on shore is an onshore battery stack. The electric energy generated by the offshore wind power generation group is used to charge the positive electrode liquid tank and the negative electrode liquid tank respectively through the offshore battery stack, and the positive electrode liquid tank and the negative electrode liquid tank with electric energy are obtained respectively, and then the positive electrode liquid tank and the negative electrode liquid tank are transported to the onshore energy storage power station through the electrolyte transport ship, and then the electrolyte in the positive electrode liquid tank and the negative electrode liquid tank with electric energy is discharged through the onshore battery stack, and the electric energy is transmitted to the power grid, thereby realizing the transmission of electric energy generated by offshore wind power to the shore.

[0077] In some optional embodiments, such as Figure 3 As shown, the positive electrode liquid tank includes: an uncharged positive electrode liquid tank A1 and a charged positive electrode liquid tank A2, and the negative electrode liquid tank includes: an uncharged negative electrode liquid tank B1 and a charged negative electrode liquid tank B2;

[0078] The offshore charging station also includes:

[0079] The offshore positive electrode reaction tank M1 is connected to the positive electrode of the offshore positive electrode reaction tank M1 and the offshore battery stack;

[0080] The offshore negative electrode reaction tank M2 is connected to the negative electrode of the offshore negative electrode reaction tank M2 and the negative electrode of the offshore battery stack;

[0081] The offshore positive electrode reaction tank M1 is connected to the non-charged positive electrode liquid tank A1 and the charged positive electrode liquid tank A2 respectively, and the offshore negative electrode reaction tank M2 is connected to the non-charged negative electrode liquid tank B1 and the charged negative electrode liquid tank B2 respectively. The electrolyte in the non-charged positive electrode liquid tank A1 enters the offshore positive electrode reaction tank M1, and the electrolyte in the non-charged negative electrode liquid tank B1 enters the offshore negative electrode reaction tank M2, and is transferred to the charged positive electrode liquid tank A2 and the charged negative electrode liquid tank B2 after being charged.

[0082] Among them, the volume of the offshore positive electrode reaction tank M1 and the offshore negative electrode reaction tank M2 is smaller than the volume of the positive electrode liquid tank or the negative electrode liquid tank.

[0083] It should be noted that the non-electrolyte positive electrode liquid tank A1 is only used to load non-electrolyte positive electrode electrolyte, that is, positive electrode electrolyte with an SOC of 0%, the charged positive electrode liquid tank A2 is only used to load charged positive electrode electrolyte, that is, positive electrode electrolyte with an SOC of 100%, the non-electrolyte negative electrode liquid tank B1 is only used to load non-electrolyte negative electrode electrolyte, that is, negative electrode electrolyte with an SOC of 0%, and the charged negative electrode liquid tank B2 is only used to load charged negative electrode electrolyte, that is, negative electrode electrolyte with an SOC of 100%, wherein the non-electrolyte electrolyte is an electrolyte with an SOC of 0%, and the charged electrolyte is an electrolyte with an SOC of 100%.

[0084] It should be understood that it usually takes several hours to fully charge and discharge the electrolyte equipped with a flow battery. Under the premise of poor continuity of wind power generation, it is impossible to ensure that the electrolyte in the charging station is in a state of SOC = 100%, nor can it be guaranteed that the electrolyte in the onshore energy storage power station is SOC = 0%. In other words, when the electrolyte tank is not fully charged, the electrolyte transport ship still has to transport the entire tank of electrolyte, which reduces the overall efficiency of electrolyte transportation. Therefore, the use of six liquid tanks in the offshore charging station improves the efficiency of electrolyte transportation.

[0085] Specifically, refer to Figure 3 First, prepare an offshore positive electrode reaction tank M1 and an offshore negative electrode reaction tank M2 with a volume smaller than that of a common liquid tank, and fix the offshore positive electrode reaction tank M1 and the offshore negative electrode reaction tank M2 to the offshore battery stack, and then prepare four liquid tanks of common volumes, two of which are filled with non-charged positive and negative electrode electrolytes and serve as non-charged positive electrode liquid tank A1 and non-charged negative electrode liquid tank B1, and the remaining two liquid tanks are not filled with any electrolyte and serve as empty charged positive electrode liquid tank A2 and charged negative electrode liquid tank B2, and then as follows Figure 3 As shown, the non-electric positive electrode liquid tank A1 and the charged positive electrode liquid tank A2 are connected to the offshore positive electrode reaction tank, and the non-electric negative electrode liquid tank B1 and the charged negative electrode liquid tank B2 are connected to the offshore negative electrode reaction tank.

[0086] refer to Figure 3 The electrolyte flow direction is controlled to control the uncharged positive electrode electrolyte in the uncharged positive electrode liquid tank A1 to flow into the offshore positive electrode reaction tank M1, and at the same time control the uncharged negative electrode electrolyte in the uncharged negative electrode liquid tank B1 to flow into the offshore negative electrode reaction tank M2. After the electrolyte in the offshore positive electrode reaction tank M1 and the offshore negative electrode reaction tank M2 is fully charged, it flows into the charged positive electrode liquid tank A2 and the charged negative electrode liquid tank B2, and then flows into the offshore positive electrode reaction tank M1 and the offshore negative electrode reaction tank M2 again. The uncharged electrolyte is repeated, so that at any time, the electrolyte in the charged positive electrode liquid tank A2 is the positive electrode electrolyte with an SOC of 100%, and the electrolyte in the charged negative electrode liquid tank B2 is the negative electrode electrolyte with an SOC of 100%. Therefore, in the case of poor continuity of offshore wind power, the charged positive electrode liquid tank A2 and the charged negative electrode liquid tank B2 are not filled with electrolyte with a SOC of 100%. In this embodiment, the charged positive electrode liquid tank A2 and the charged negative electrode liquid tank B2 filled with electrolyte with a SOC of 100% are only transferred to the onshore energy storage power station by the electrolyte transfer ship. Compared with transferring a whole tank of partially charged electrolyte by the transfer ship, the mass of the electrolyte is reduced, and the transportation efficiency and flexibility of transportation are greatly improved.

[0087] Generally, liquid flow batteries adopt a double liquid tank design. The energy-power of liquid flow batteries is relatively large, such as 10MW / 40MWh (4 hours) or 10MW / 60MWh (6 hours), and it takes a long time to fully charge and discharge. For example, in wind power generation, this power generation method with weak power output fluctuation regularity, its electrolyte is in a state of partial charge and discharge for most of the time. If such electrolyte is transported, its energy consumption is relatively large. In order to make the transported electrolytes in a state of complete charge and discharge, the liquid flow batteries of the charging station and energy storage power station in this embodiment adopt a six-liquid tank design. The full liquid tank and the empty liquid tank respectively store the electrolyte in the fully charged (SOC=100%) and discharged state (SOC=0%) state, and are designed for a longer number of charge and discharge hours, such as 10MW / 40MWh (4 hours for full charge) or 10MW / 60MWh (6 hours for full charge). The reaction tank is directly connected to the battery stack for electrochemical reaction, and is designed for shorter charging and discharging hours, such as 10MW / 4MWh (15 minutes) and 10MW / 2MWh (12 minutes). During charging operation, the electrolyte of the offshore charging station is added to the reaction tank from the empty electrolyte tank. After the electrolyte in the reaction tank is completely reacted (charged), it is discharged into the full electrolyte tank, and then the electrolyte is added to the reaction tank from the empty electrolyte tank. The electrolyte in the full electrolyte tank is waiting to be transported back to the shore by the transport ship and sent to the onshore energy storage power station.

[0088] In some optional embodiments, such as Figure 3 As shown, the offshore charging station also includes:

[0089] A first control valve K1, wherein a first end of the first control valve K1 is connected to a first end of an offshore cathode reaction tank M1, and a second end of the first control valve K1 is connected to an electrically charged cathode liquid tank A2;

[0090] A second control valve K2, wherein a first end of the second control valve K2 is connected to a second end of the offshore cathode reaction tank M1, and a second end of the second control valve K2 is connected to the non-electrode cathode liquid tank A1;

[0091] A third control valve K3, wherein a first end of the third control valve K3 is connected to a first end of the offshore negative electrode reaction tank M2, and a second end of the third control valve K3 is connected to the charged negative electrode liquid tank B2;

[0092] A fourth control valve K4, wherein a first end of the fourth control valve K4 is connected to a second end of the offshore cathode reaction tank M2, and a second end of the fourth control valve K4 is connected to the non-electrode cathode liquid tank B1;

[0093] The first control valve K1 and the second control valve K2 are used to control the flow direction of the positive electrode electrolyte during charging;

[0094] The third control valve K3 and the fourth control valve K4 are used to control the flow direction of the negative electrode electrolyte during charging.

[0095] refer to Figure 3 When controlling the electric energy of offshore wind power generation to charge the electrolyte, first control the second control valve K2 and the fourth control valve K4 to open, so that the non-charged positive electrode electrolyte in the non-charged positive electrode liquid tank A1 enters the offshore positive electrode reaction tank M1, and the non-charged negative electrode electrolyte in the non-charged negative electrode liquid tank B1 enters the offshore negative electrode reaction tank M2, and then control the second control valve K2 and the fourth control valve K4 to close, so that the negative electrode electrolyte and the positive electrode electrolyte are charged. After the charging is completed, control the first control valve K1 and the third control valve K3 to open, so that the fully charged positive electrode electrolyte enters the charged positive electrode liquid tank A2, and the fully charged negative electrode electrolyte enters the charged negative electrode liquid tank B2.

[0096] In some optional embodiments, such as Figure 4 As shown, the onshore energy storage power station also includes:

[0097] The positive electrode reaction tank M3 on the shore is connected to the positive electrode of the battery stack on the shore;

[0098] The onshore negative electrode reaction tank M4 is connected to the negative electrode of the onshore battery stack;

[0099] The positive electrode reaction tank M3 on the shore is connected to the non-charged positive electrode liquid tank A1 and the charged positive electrode liquid tank A2 respectively, and the negative electrode reaction tank M4 on the shore is connected to the non-charged negative electrode liquid tank B1 and the charged negative electrode liquid tank B2 respectively, the electric liquid of the charged positive electrode liquid tank A2 enters the positive electrode reaction tank M3 on the shore, and the electric liquid of the charged negative electrode liquid tank B2 enters the negative electrode reaction tank M4 on the shore, and is discharged and then transmitted to the non-charged positive electrode liquid tank A1 and the non-charged negative electrode liquid tank B1;

[0100] Among them, the volume of the onshore positive electrode reaction tank M3 and the onshore negative electrode reaction tank M4 is smaller than the volume of the positive electrode liquid tank or the negative electrode liquid tank.

[0101] During the discharge operation, the electrolyte from the onshore energy storage power station is added from the full liquid tank to the reaction liquid tank. After the electrolyte in the reaction liquid tank is completely reacted (discharged), it is discharged into the empty liquid tank, and then the electrolyte is added from the full liquid tank to the reaction liquid tank. The electrolyte in the empty liquid tank waits to be transported to the offshore charging station by a transport ship.

[0102] Specifically, refer to Figure 4 , transport the charged positive electrode liquid tank A2 and the positive electrode reaction tank M3 on shore back from the offshore charging station through the electrolyte transport ship, connect the charged positive electrode liquid tank A2 with the positive electrode reaction tank M3 on shore, and connect the charged negative electrode liquid tank B2 with the negative electrode reaction tank M4 on shore, then connect the empty tank of uncharged positive electrode liquid tank A1 with the positive electrode reaction tank M3 on shore, and connect the empty tank of uncharged negative electrode liquid tank B1 with the negative electrode reaction tank M4 on shore.

[0103] refer to Figure 4The electrolyte flow direction in the charged positive electrode tank A2 is controlled to flow into the onshore positive electrode reaction tank M3, and the charged negative electrode electrolyte in the charged negative electrode tank B2 is controlled to flow into the onshore negative electrode reaction tank M4. After the electrolyte in the onshore positive electrode reaction tank M3 and the onshore negative electrode reaction tank M4 is discharged, it flows into the non-charged positive electrode tank A1 and the non-charged negative electrode tank B1. It should be understood that the obtained non-charged positive electrode tank A1 and non-charged negative electrode tank B1 with an SOC of 0% are transported to the offshore charging station by the electrolyte transport ship for the next electrolyte charging operation. Thus, the charged electrolyte transported back from the offshore charging station is discharged to obtain the non-charged positive electrode tank A1 and the non-charged negative electrode tank B1 with an SOC of 0%, and then the electrolyte with an SOC of 0% is transported to the offshore charging station, thereby improving the transportation efficiency compared to transporting the electrolyte that is not fully discharged to the offshore charging station.

[0104] In some optional embodiments, such as Figure 4 As shown, the offshore charging station also includes:

[0105] A fifth control valve K5, wherein a first end of the fifth control valve K5 is connected to a first end of the positive electrode reaction tank M3 on the shore, and a second end of the fifth control valve K5 is connected to the charged positive electrode liquid tank A2;

[0106] A sixth control valve K6, wherein a first end of the sixth control valve K6 is connected to a second end of the cathode reaction tank M3 on the shore, and a second end of the sixth control valve K6 is connected to the non-electrode cathode liquid tank A1;

[0107] A seventh control valve K7, wherein a first end of the seventh control valve K7 is connected to a first end of the negative electrode reaction tank M4 on the shore, and a second end of the seventh control valve K7 is connected to the charged negative electrode liquid tank B2;

[0108] An eighth control valve K8, wherein a first end of the eighth control valve K8 is connected to a second end of the negative electrode reaction tank M4 on the shore, and a second end of the eighth control valve K8 is connected to the non-electrode negative electrode liquid tank B1;

[0109] The fifth control valve K5 and the sixth control valve K6 are used to control the flow direction of the positive electrode electrolyte during discharge;

[0110] The seventh control valve K7 and the eighth control valve K8 are used to control the flow direction of the negative electrode electrolyte during charging.

[0111] refer to Figure 4When discharging the charged electrolyte transported back from the sea, first control the fifth control valve K5 and the seventh control valve K7 to open, so that the charged positive electrode electrolyte in the charged positive electrode liquid tank A2 enters the positive electrode reaction tank M3 on the shore, and the charged negative electrode electrolyte in the charged negative electrode liquid tank B2 enters the negative electrode reaction tank M4 on the shore, and then control the fifth control valve K5 and the seventh control valve K7 to close, so that the negative electrode electrolyte and the positive electrode electrolyte are discharged. After the discharge is completed, control the sixth control valve K6 and the eighth control valve K8 to open, so that the discharged positive electrode electrolyte enters the non-charged positive electrode liquid tank A1, and the discharged negative electrode electrolyte enters the non-charged negative electrode liquid tank B1. Finally, the non-charged positive electrode liquid tank A1 and the non-charged negative electrode liquid tank B1 are transported to the offshore charging station by the electrolyte transport ship for the next charging operation.

[0112] refer to Figure 5 , Figure 5 The arrow in the figure indicates the flow direction of the electrolyte. The empty charged negative electrode liquid tank B2 and the charged positive electrode liquid tank A2, as well as the first non-charged positive electrode liquid tank A1a and the first non-charged negative electrode liquid tank B1a filled with non-charged electrolyte are transported to the offshore charging station for connection by the electrolyte transport ship. The positive non-charged electrolyte in the first non-charged positive electrode liquid tank A1a is controlled to enter the offshore positive electrode reaction tank M1, and the negative non-charged electrolyte in the first non-charged negative electrode liquid tank B1a is controlled to enter the offshore negative electrode reaction tank M2 for charging reaction. Then, the fully charged electrolyte is controlled to enter the charged negative electrode liquid tank B2 and the charged positive electrode liquid tank A2 to obtain the charged negative electrode liquid tank B2 and the charged positive electrode liquid tank A2 with an SOC of 100%. The charged negative electrode liquid tank with an SOC of 100% is transported to the offshore charging station by the electrolyte transport ship. The cathode liquid tank B2 and the charged cathode liquid tank A2 are transported to the onshore energy storage power station for connection, and the empty second non-charged cathode liquid tank A1b and the second non-charged cathode liquid tank B1b are connected, and the charged cathode electrolyte of the charged cathode liquid tank A2 is controlled to enter the onshore cathode reaction tank M3, and the charged cathode electrolyte of the charged cathode liquid tank B2 enters the onshore cathode reaction tank M4 for discharge reaction, and the discharged electrolyte is controlled to enter the second non-charged cathode liquid tank A1b and the second non-charged cathode liquid tank B1b, and the electric energy obtained by the discharge operation is transmitted to the power grid, and the obtained second non-charged cathode liquid tank A1b and the second non-charged cathode liquid tank B1b filled with non-charged electrolyte are transported to the offshore charging station for the next charging operation. Thus, when the continuity of offshore power generation is poor, for example, only 1 / 3 of the volume of electrolyte with an SOC of 100% is transported to the shore, thereby improving the transportation efficiency.

[0113] The energy efficiency of liquid flow batteries can generally reach 75% to 80%, and the energy loss of ship transportation is related to the transportation distance and speed. Calculated at a ship speed of 5m / s, the propulsion power of low-speed ships is generally in the range of 0.03-0.1KW / t. Among them, the minimum propulsion power of the ship is affected by factors such as ship type, load, speed, and sea conditions. The lower limit of the value here is the calculated theoretical value of 0.03KW / t, and the upper limit is a conservative value of 0.1KW / t. The energy density of the electrolyte of the all-vanadium liquid flow battery can generally reach 30-40Wh / kg (KWh / t). If the total sailing distance of an electrolyte transportation operation is 180 kilometers (about 100 nautical miles) and the total sailing time is 10 hours, the total energy consumption in the voyage is 0.3-1KWh / t.

[0114] Taking into account the deadweight of the barge (20% of the total weight), the corresponding energy consumption is about 0.375-1.25KWh / t, which only accounts for 0.9%-3.1% of the total transmitted power. Therefore, the total efficiency of the whole system can reach more than 72%, which has a very good energy efficiency.

[0115] In some optional embodiments, such as Figure 1 As shown, the system also includes:

[0116] The offshore wind power converging station is connected to the offshore charging station and is used to converge the electric energy generated at sea and send it to the offshore charging station.

[0117] An offshore liquid flow battery electrolyte charging station is set up between the offshore wind farm confluence station and the onshore power grid. The electrolyte is charged using the electricity output by the wind farm, and a liquid flow battery energy storage station is set up on shore to discharge the power grid. The output voltage of the wind turbine is generally 690V AC, which can fully meet the voltage requirements for charging the liquid flow battery after rectification. The charging voltage of a general containerized liquid flow battery pack is about 500V DC. Therefore, there is no need to build an offshore booster device. It is only necessary to converge the electricity generated by the generator and rectify it into DC to achieve offshore charging. Furthermore, the smooth transmission of offshore wind power to the shore is achieved without the need to build an offshore booster station or lay cables, which reduces the overall investment cost of offshore wind power.

[0118] This embodiment provides an offshore wind power transmission and energy storage method, which is applied to the above-mentioned offshore wind power transmission and energy storage integrated system. The offshore wind power transmission and energy storage method includes:

[0119] (1) controlling the offshore charging station to charge the electric energy generated by the offshore wind farm into the electrolyte to obtain a charged electrolyte;

[0120] (2) The electrolyte transport vessel transports the charged electrolyte loaded from the offshore charging station to the onshore energy storage power station;

[0121] (3) Control the onshore energy storage power station to store the electrical energy discharged from the charged electrolyte into the power grid.

[0122] The offshore wind turbines convert wind energy into electrical energy and transmit it to the offshore charging station. The offshore charging station charges the electrical energy into the electrolyte to obtain charged electrolyte. The charged electrolyte is then transported to the shore by an electrolyte transport ship. The onshore energy storage power station stores the electrical energy of the charged electrolyte in the power grid. The discharged uncharged electrolyte is then transported to the offshore charging station by the electrolyte transport ship. The cycle continues in this way, eliminating the need to lay submarine cables and greatly reducing costs.

[0123] In some optional implementations, the offshore wind power transmission and energy storage method further includes:

[0124] (1) opening the second control valve and the fourth control valve, and closing the first control valve and the third control valve, controlling the electrolyte in the non-electric cathode liquid tank to enter the offshore cathode reaction tank for charging, and controlling the electrolyte in the non-electric cathode liquid tank to enter the offshore cathode reaction tank for charging;

[0125] (2) After charging is completed, close the second control valve and the fourth control valve, and open the first control valve and the third control valve to control the transfer of the charged electrolyte of the offshore positive electrode reaction tank to the charged positive electrode liquid tank, and control the transfer of the charged electrolyte of the offshore negative electrode reaction tank to the charged negative electrode liquid tank.

[0126] When controlling the electric energy of offshore wind power generation to charge the electrolyte, first control the second control valve K2 and the fourth control valve K4 to open, so that the non-charged positive electrode electrolyte in the non-charged positive electrode liquid tank A1 enters the offshore positive electrode reaction tank M1, and the non-charged negative electrode electrolyte in the non-charged negative electrode liquid tank B1 enters the offshore negative electrode reaction tank M2, and then control the second control valve K2 and the fourth control valve K4 to close, so that the negative electrode electrolyte and the positive electrode electrolyte are charged. After the charging is completed, control the first control valve K1 and the third control valve K3 to open, so that the fully charged positive electrode electrolyte enters the charged positive electrode liquid tank A2, and the fully charged negative electrode electrolyte enters the charged negative electrode liquid tank B2.

[0127] This embodiment also provides a computer device. Figure 6 , Figure 6 Schematic diagram of the hardware structure of the computer device according to the embodiment of the present invention. Figure 6As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 6 A processor 10 is taken as an example.

[0128] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0129] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0130] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0131] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0132] The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 6 The example of connecting through bus is taken in the following.

[0133] The input device 30 can receive input digital or character information, and generate key signal input related to the user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator bar, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0134] This embodiment also provides a computer-readable storage medium, and the method according to this embodiment can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0135] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An offshore wind power transmission and energy storage integrated system, characterized in that: The system comprises: An offshore charging station is used to charge the electric energy generated by the offshore wind farm into the electrolyte to obtain a charged electrolyte; An onshore energy storage power station, used to store the electric energy discharged from the charged electrolyte into a power grid and obtain a non-charged electrolyte; The electrolyte transport ship is used to transport the charged electrolyte loaded from the offshore charging station to the onshore energy storage power station, and to transport the non-charged electrolyte to the offshore charging station.

2. The system according to claim 1, characterized in that The system further comprises a cathode liquid tank and an anode liquid tank, and the offshore charging station comprises: an offshore battery stack; The offshore battery stack is connected to the cathode liquid tank and the cathode liquid tank respectively, and is used to store the electric energy generated at sea into the cathode liquid tank and the cathode liquid tank respectively; The onshore energy storage power station comprises: an onshore battery stack; The onshore battery stack is connected to the cathode liquid tank and the cathode liquid tank respectively, and is used to store the electrical energy of the cathode liquid tank and the cathode liquid tank; The electrolyte transport ship is used to transport the cathode liquid tank and the cathode liquid tank.

3. The system according to claim 2, characterized in that The positive electrode liquid tank includes: a non-charged positive electrode liquid tank and a charged positive electrode liquid tank, and the negative electrode liquid tank includes: a non-charged negative electrode liquid tank and a charged negative electrode liquid tank; The offshore charging station also includes: An offshore positive electrode reaction tank, the offshore positive electrode reaction tank is connected to the positive electrode of the offshore battery stack; An offshore negative electrode reaction tank, the offshore negative electrode reaction tank is connected to the negative electrode of the offshore battery stack; The offshore positive electrode reaction tank is connected to the non-electric positive electrode liquid tank and the charged positive electrode liquid tank respectively, and the offshore negative electrode reaction tank is connected to the non-electric negative electrode liquid tank and the charged negative electrode liquid tank respectively, the electrolyte of the non-electric positive electrode liquid tank enters the offshore positive electrode reaction tank, and the electrolyte of the non-electric negative electrode liquid tank enters the offshore negative electrode reaction tank, and is transferred to the charged positive electrode liquid tank and the charged negative electrode liquid tank after being charged; Wherein, the volume of the offshore positive electrode reaction tank and the offshore negative electrode reaction tank is smaller than the volume of the positive electrode liquid tank or the negative electrode liquid tank.

4. The system according to claim 3, characterized in that The offshore charging station also includes: a first control valve, wherein a first end of the first control valve is connected to a first end of the offshore cathode reaction tank, and a second end of the first control valve is connected to the charged cathode liquid tank; a second control valve, wherein a first end of the second control valve is connected to a second end of the offshore cathode reaction tank, and a second end of the second control valve is connected to the non-electrolyte cathode liquid tank; a third control valve, wherein a first end of the third control valve is connected to a first end of the offshore negative electrode reaction tank, and a second end of the third control valve is connected to the charged negative electrode liquid tank; a fourth control valve, wherein a first end of the fourth control valve is connected to a second end of the offshore cathode reaction tank, and a second end of the fourth control valve is connected to the non-electrode cathode liquid tank; The first control valve and the second control valve are used to control the flow direction of the positive electrode electrolyte during charging; The third control valve and the fourth control valve are used to control the flow direction of the negative electrode electrolyte during charging.

5. The system according to claim 4, characterized in that The onshore energy storage power station also includes: An onshore positive electrode reaction tank, the onshore positive electrode reaction tank is connected to the positive electrode of the onshore battery stack; An onshore negative electrode reaction tank, the onshore negative electrode reaction tank is connected to the negative electrode of the onshore battery stack; The positive electrode reaction tank on the shore is connected to the non-electric positive electrode liquid tank and the charged positive electrode liquid tank respectively, and the negative electrode reaction tank on the shore is connected to the non-electric negative electrode liquid tank and the charged negative electrode liquid tank respectively, the electric liquid of the charged positive electrode liquid tank enters the positive electrode reaction tank on the shore, and the electric liquid of the charged negative electrode liquid tank enters the negative electrode reaction tank on the shore, and is discharged and then transmitted to the non-electric positive electrode liquid tank and the non-electric negative electrode liquid tank; Wherein, the volume of the onshore positive electrode reaction tank and the onshore negative electrode reaction tank is smaller than the volume of the positive electrode liquid tank or the negative electrode liquid tank.

6. The system according to claim 5, characterized in that The offshore charging station also includes: a fifth control valve, wherein a first end of the fifth control valve is connected to a first end of the positive electrode reaction tank on the shore, and a second end of the fifth control valve is connected to the charged positive electrode liquid tank; a sixth control valve, wherein a first end of the sixth control valve is connected to a second end of the onshore cathode reaction tank, and a second end of the sixth control valve is connected to the non-electrolyte cathode liquid tank; a seventh control valve, wherein a first end of the seventh control valve is connected to a first end of the negative electrode reaction tank on the shore, and a second end of the seventh control valve is connected to the charged negative electrode liquid tank; an eighth control valve, wherein a first end of the eighth control valve is connected to a second end of the negative electrode reaction tank on the shore, and a second end of the eighth control valve is connected to the non-electrode negative electrode liquid tank; The fifth control valve and the sixth control valve are used to control the flow direction of the positive electrode electrolyte during discharge; The seventh control valve and the eighth control valve are used to control the flow direction of the negative electrode electrolyte during charging.

7. The system according to claim 6, characterized in that The system further comprises: An offshore wind power converging station is connected to the offshore charging station and is used for converging the electric energy generated at sea and sending it to the offshore charging station.

8. An offshore wind power transmission and energy storage method, characterized in that: The method is applied to the system according to any one of claims 1 to 7, and the method comprises: Controlling the offshore charging station to charge the electric energy generated by the offshore wind farm into the electrolyte to obtain a charged electrolyte; Transporting the charged electrolyte loaded from the offshore charging station to the onshore energy storage power station by an electrolyte transport ship; The onshore energy storage power station is controlled to store the electric energy discharged from the charged electrolyte into a power grid.

9. The method according to claim 8, characterized in that The method further comprises: Open the second control valve and the fourth control valve, and close the first control valve and the third control valve, control the electrolyte of the non-electric cathode liquid tank to enter the offshore cathode reaction tank for charging, and control the electrolyte of the non-electric cathode liquid tank to enter the offshore cathode reaction tank for charging; After charging is completed, the second control valve and the fourth control valve are closed, and the first control valve and the third control valve are opened to control the transfer of the charged electrolyte of the offshore positive electrode reaction tank to the charged positive electrode liquid tank, and to control the transfer of the charged electrolyte of the offshore negative electrode reaction tank to the charged negative electrode liquid tank.

10. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the offshore wind power transmission and energy storage method according to any one of claims 8 or 9 by executing the computer instructions.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the offshore wind power transmission and energy storage method according to any one of claims 8 or 9.

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