A power transmission operation mode conversion method and device, electronic equipment and storage medium

Abstract

The application discloses a power transmission operation mode conversion method and device, electronic equipment and a storage medium. The method is applied to power transmission operation mode conversion of an alternating current field. The alternating current field comprises a first bus, a second bus and alternating current strings between the first bus and the second bus. The alternating current strings are connected with a converter transformer and alternating current lines. When a power transmission operation mode conversion instruction is received, the switching states of line switches on the alternating current lines and switches of the alternating current strings are acquired in real time. According to preset power transmission operation mode conversion criteria, the line switches of the alternating current lines and the switches of the alternating current strings are controlled, so that the switching states of the line switches of the alternating current lines and the switches of the alternating current strings satisfy the preset power transmission operation mode conversion criteria. According to preset anti-loop criteria, the line switches on each alternating current line and the switches of each alternating current string are controlled, and the power transmission operation mode of the alternating current field is converted. The occurrence of misoperation is avoided, and safe and reliable conversion of the power transmission operation mode is realized.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to a power system, and in particular to a power transmission operation mode conversion method and device, an electronic device, and a storage medium. BACKGROUND

[0002] Compared with AC power transmission, flexible DC power transmission has better economy and applicability in long-distance and large-capacity power transmission occasions. When the flexible DC power transmission is used to realize power grid interconnection, it does not increase the short-circuit capacity, is conducive to preventing the expansion of AC system faults, and has the characteristics of fast controllable power flow, which can be used for stability and frequency control of the connected power grid system. Due to the good economy, interconnection and controllability of the flexible DC power transmission, it has developed rapidly in the power system in recent years.

[0003] In actual operation, in order to avoid problems such as excessive short-circuit current, different AC systems connected by different AC lines need to avoid loop operation, which requires that the power of different converter transformers of the flexible DC power transmission system exists in two modes of being all sent to the same AC system (full sending) or being sent to different AC systems respectively (partial sending), and the two operation modes can be converted to each other.

[0004] At present, the flexible DC project generally adopts manual operation mode when converting between full sending and partial sending operation modes, which is prone to conversion failure caused by human error, and in serious cases, it may also cause mislooping of different AC systems and trigger operation accidents. At present, there is no method that can realize safe and reliable conversion between full sending and partial sending operation modes. SUMMARY

[0005] The present application provides a power transmission operation mode conversion method to realize safe and reliable conversion between full sending and partial sending operation modes.

[0006] In a first aspect, the embodiments of the present application provide a power transmission operation mode conversion method applied to power transmission operation mode conversion of an AC field, the AC field including a first bus, a second bus, and an AC string located between the first bus and the second bus, the AC string being connected with a converter transformer and connected with an AC line through a line switch, and the method comprising:

[0007] Upon receiving a conversion instruction of the power transmission operation mode, real-time acquisition of switch states of the line switch on the AC line and switches of the AC string;

[0008] According to a preset power transmission operation mode conversion criterion, control of the line switch on the AC line and the switches of the AC string is performed so that the switch states of the line switch on the AC line and the switches of the AC string satisfy the preset power transmission operation mode conversion criterion;

[0009] The line switches on each AC line and the switches of each AC string are controlled according to the preset anti-loop criterion to switch the power transmission operation mode of the AC field.

[0010] Optionally, the power transmission operation mode switching criterion comprises:

[0011] The same bus is prohibited from accessing two converter transformers, and the middle switches of the AC strings connected to different AC lines are in the split state.

[0012] Optionally, the converter transformers comprise a first converter transformer and a second converter transformer, and the control of the line switches on the AC lines and the switches of the AC strings according to the preset power transmission operation mode switching criterion comprises:

[0013] controlling the side switches connected to the first bus in the AC string connected to the second converter transformer to be in the split state, and controlling the side switches connected to the second bus in the AC string connected to the first converter transformer to be in the split state;

[0014] controlling the middle switches of the AC strings connected to the first AC line and the second AC line to be in the split state.

[0015] Optionally, the anti-loop criterion comprises:

[0016] If the first AC line is connected to the first bus or the second bus, the second AC line is prohibited from accessing the AC field when the switches of any one of the AC strings between the first bus and the second bus are in the closed state, the first AC line is a line connected to the first AC system, and the second AC line is a line connected to the second AC system.

[0017] The control of the line switches on each AC line and the switches of each AC string according to the anti-loop criterion to switch the power transmission operation mode of the AC field comprises:

[0018] When the switching instruction is to output the power of all converter transformers to the first AC system, the switches in the AC string of the converter transformer are controlled so that the converter transformer accesses the first bus and / or the second bus.

[0019] All switches of at least one AC string between the first bus and the second bus are controlled to be in the closed state.

[0020] The line switch of the first AC line is controlled to be in the closed state, the line switch of the second AC line is controlled to be in the split state, and the side switch connected to the line switch on the first AC line in the AC string of the first AC line is controlled to be in the closed state, so that the power of all converter transformers of the AC field is transmitted to the first AC system.

[0021] Optionally, the anti-loop criterion comprises:

[0022] When at least one of the switches in each of the AC strings is in the open state, the first AC line and the second AC line are prohibited from being connected to the first busbar or the second busbar at the same time, and the first AC line and the second AC line are prohibited from being connected through the middle switch of the AC string.

[0023] Optionally, the AC field adopts a two-thirds connection mode and comprises a first AC string, a second AC string and a third AC string, each of the AC strings comprises a first side switch, a middle switch and a second side switch connected in sequence between the first busbar and the second busbar, two ends of the middle switch of the first AC string are connected to the second converter transformer and the second AC line respectively, two ends of the middle switch of the second AC string are connected to the first converter transformer and the first AC line respectively, and two ends of the middle switch of the third AC string are connected to the first AC line and the second AC line respectively.

[0024] The control of the line switches on the AC lines and the switches of the AC strings according to the anti-loop criterion to switch the power transmission operation mode of the AC field comprises:

[0025] When the switching instruction is to transmit the power of the first converter transformer to the first AC system and transmit the power of the second converter transformer to the second AC system, the first side switch of the first AC string is controlled to be in the open state, the second side switch and the middle switch are controlled to be in the closed state, the line switch of the second AC line is controlled to be in the closed state, and the power of the second converter transformer is output to the second busbar and the second AC line;

[0026] The first side switch and the middle switch of the second AC string are controlled to be in the closed state, the second side switch is controlled to be in the open state, and the line switch of the first AC line is controlled to be in the closed state, and the power of the first converter transformer is output to the first busbar and the first AC line;

[0027] The middle switch of the third AC string is controlled to be in the open state.

[0028] In a second aspect, an embodiment of the present application further provides a power transmission operation mode switching device, characterized by being used for switching the power transmission operation mode of an AC field, the AC field comprising a first busbar, a second busbar and an AC string between the first busbar and the second busbar, the AC string being connected to a converter transformer and connected to an AC line through a line switch, and comprising:

[0029] The switch state acquisition module is configured to acquire, in real time, the switch states of the line switches on the AC lines and the switches of the AC strings when a conversion instruction of the power transmission operation mode is received.

[0030] The switch state control module is configured to control the line switches on the AC lines and the switches of the AC strings according to a preset conversion criterion of the power transmission operation mode, so that the switch states of the line switches on the AC lines and the switches of the AC strings satisfy the preset conversion criterion of the power transmission operation mode.

[0031] The power transmission operation mode conversion module is configured to control the line switches on each AC line and the switches of each AC string according to a preset anti-loop criterion, so as to convert the power transmission operation mode of the AC field.

[0032] In a third aspect, an electronic device is provided, and the electronic device includes:

[0033] at least one processor; and

[0034] a memory connected with the at least one processor; wherein

[0035] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the power transmission operation mode conversion method in any one of the first aspect.

[0036] In a fourth aspect, a computer readable storage medium is provided, and the computer readable storage medium stores computer instructions for enabling a processor to implement the power transmission operation mode conversion method in any one of the first aspect when the processor executes the computer instructions.

[0037] The present application can pre-set the power transmission operation mode conversion criterion and the anti-loop criterion, and when the switch state satisfies the power transmission operation mode conversion, the switch action is controlled according to the anti-loop criterion to realize the power transmission operation mode conversion, without manual operation, so as to avoid the manual operation from causing the loop operation, and ensure the safety and reliability of the power transmission operation mode conversion. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to make the technical solutions in the embodiments of the present application clearer, the accompanying drawings needed in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0039] Figure 1 is a flow chart of a power transmission operation mode conversion method in the first embodiment of the present application;

[0040] Figure 2 is a flow chart of a power transmission operation mode conversion method in the second embodiment of the present application;

[0041] Figure 3 is a circuit schematic diagram of an AC field circuit in the second embodiment of the present application;

[0042] Figure 4 is a structural schematic diagram of a power transmission operation mode conversion device in the third embodiment of the present application;

[0043] Figure 5 is a structural schematic diagram of an electronic device in the fourth embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the technical solutions in the embodiments of the present application clearer, the accompanying drawings needed in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0045] Embodiment One

[0046] Figure 1 is a flow chart of a power transmission operation mode conversion method in the first embodiment of the present application, which is applicable to the power transmission operation mode conversion of an AC field. The method can be executed by a power transmission operation mode conversion device, which can be realized in the form of hardware and / or software, and can be configured in an electronic device. As shown in the figure, the power transmission operation mode conversion method comprises the following steps. Figure 1

[0047] S110, when receiving a conversion instruction of the power transmission operation mode, acquiring the switch state of the line switch and the switch of the AC string on the AC line.

[0048] ​The embodiment is applied to the conversion of the transmission operation mode of the AC field. In an optional embodiment, the AC field includes a first bus, a second bus, and an AC string between the first bus and the second bus, the AC string is connected with a converter transformer, and is connected with an AC line through a line switch.

[0049] The transmission operation mode can include a full transmission mode and a partial transmission mode. In the full transmission mode, the power of different converter transformers of the flexible DC power transmission system is transmitted to the same AC system. In the partial transmission mode, the power of different converter transformers of the flexible DC power transmission system is transmitted to different AC systems. The conversion instruction can be a transmission operation mode conversion switch triggered by an operator.

[0050] The AC line can be a transmission line intersecting with the bus and connected to an AC system. The AC string can be a passage between the buses. The switch can be a circuit breaker and a knife switch. The switch state can include an open state and a closed state. The circuit breaker can be a switching device capable of opening and closing, carrying, and breaking the current under normal circuit conditions and capable of closing, carrying, and breaking the current under abnormal circuit conditions within a specified time. The opening and closing of the circuit breaker forms the communication of the AC string. The circuit breaker can be a plug-in circuit breaker, a fixed circuit breaker, a drawer-type circuit breaker, or the like, which is not limited in the present application.

[0051] The switch state of the line switch on the AC line and the switch of the AC string can be collected in real time through a field I / O device.

[0052] S120, according to the preset transmission operation mode conversion criterion, control the line switch on the AC line and the switch of the AC string, so that the switch state of the line switch on the AC line and the switch of the AC string meets the preset transmission operation mode conversion criterion.

[0053] The transmission operation mode conversion criterion can be a switching basis of the opening and closing state of the switch during the conversion of the transmission operation mode.

[0054] Optionally, the transmission operation mode conversion criterion can include that two converter transformers are prohibited from being connected to the same bus, and the switch of the AC string connected to different AC lines is in the open state.

[0055] The converter transformer can include a first converter transformer and a second converter transformer.

[0056] Optionally, the control of the line switches on the AC lines and the switches of the AC strings according to the preset transmission operation mode conversion criterion can include controlling the side switches connected to the first bus in the AC string connected to the second converter transformer to be in the split state, and controlling the side switches connected to the second bus in the AC string connected to the first converter transformer to be in the split state, and controlling the middle switches of the AC string connecting the first AC line and the second AC line to be in the split state.

[0057] The control of the line switches on the AC lines and the switches of the AC strings can include controlling the side switches connected to the first bus in the AC string connected to the second converter transformer to be in the split state, and controlling the side switches connected to the second bus in the AC string connected to the first converter transformer to be in the split state, and controlling the middle switches of the AC string connecting the first AC line and the second AC line to be in the split state, so as to prohibit the same bus from being connected to two converter transformers, and the middle switches of the AC string connecting different AC lines are in the split state, thereby meeting the transmission operation mode conversion criterion.

[0058] S130, according to the preset anti-looping criterion, control the line switches on each AC line and the switches of each AC string to convert the transmission operation mode of the AC field.

[0059] The anti-looping criterion can include: when the switches of any one AC string between the first bus and the second bus are all in the closed state, if the first AC line is connected to the first bus or the second bus, the second AC line is prohibited from being connected to the AC field, and the first AC line is a line connected to the first AC system, and the second AC line is a line connected to the second AC system.

[0060] Optionally, the anti-looping criterion can also include: when at least one of the switches of each AC string is in the split state, the first AC line and the second AC line are prohibited from being connected to the first bus or the second bus at the same time, and the first AC line and the second AC line are prohibited from being connected through the middle switches of the AC string.

[0061] Based on the above anti-looping criterion, the anti-looping criterion is used to prevent the occurrence of looping during the transmission operation mode conversion process, thereby ensuring the safe and reliable conversion of the transmission mode.

[0062] This invention obtains the switching states of line switches and AC string switches on AC lines upon receiving a power transmission operation mode conversion command. Based on preset power transmission operation mode conversion criteria, it controls the switches of AC lines and AC strings to ensure their switching states meet the criteria. Furthermore, it controls the switching of line switches and AC string switches on each AC line according to preset anti-loop criterion, thereby converting the power transmission operation mode of the AC field. This embodiment allows for pre-setting of power transmission operation mode conversion criteria and anti-loop criterion. When the switch states meet the requirements for power transmission operation mode conversion, the switch action is controlled according to the anti-loop criterion to achieve the power transmission operation mode conversion. This eliminates the need for manual operation, avoiding errors caused by manual operation that could lead to loop closure, and ensuring the safe and reliable conversion of power transmission operation modes.

[0063] Example 2

[0064] Figure 2 This is a flowchart of a power transmission operation mode switching method provided in Embodiment 2 of the present invention. This embodiment of the present invention is an optimization based on Embodiment 1 described above, such as... Figure 2 As shown, the power transmission operation mode conversion method includes:

[0065] S201. Upon receiving a command to switch the power transmission operation mode, obtain the switching status of the line switches and AC string switches on the AC line.

[0066] S202, control the side switch connected to the first bus in the AC string connected to the second converter transformer to be in the open position, and control the side switch connected to the second bus in the AC string connected to the first converter transformer to be in the open position.

[0067] S203, The switch controlling the AC string connecting the first AC line and the second AC line is in the open position.

[0068] like Figure 3 As shown, the AC field in this embodiment adopts a three-way wiring method. The AC field includes a first AC string 1, a second AC string 2, and a third AC string 3. Each AC string includes a first side switch A, an intermediate switch B, and a second side switch C connected sequentially between the first bus M1 and the second bus M2. Each AC line has a switch Q. The two ends of the intermediate switch B1 of the first AC string 1 are connected to the second converter transformer T2 and the second AC line L22, respectively. The two ends of the intermediate switch B2 of the second AC string 2 are connected to the first converter transformer T1 and the first AC line L12, respectively. The two ends of the intermediate switch B3 of the third AC string 3 are connected to the first AC line L11 and the second AC line L21, respectively.

[0069] In one example, see Figure 3The first switch A1 in the first AC string 1 connected to the first bus M1 is in the open position, and the second switch C2 in the second AC string 2 connected to the first converter transformer T1 is in the open position. The intermediate switch B3 in the third AC string 3 connected to the first AC line L11 and the second AC line L21 is in the open position. At this time, the status of each switch in the AC field realizes that two converter transformers are prohibited from being connected to the same bus, and the intermediate switches of the AC strings connected to different AC lines are in the open position, which satisfies the power transmission operation mode conversion criterion.

[0070] When the switches in the AC field meet the power transmission operation mode conversion criteria through S202-S203, if the conversion command is to output the power of all converter transformers to the first AC system (full transmission), then S204-S206 are executed.

[0071] S204. When the conversion instruction is to output the electrical energy of all converter transformers to the first AC system, control the switches in the AC series where all converter transformers are located, so that the converter transformers are connected to the first bus and / or the second bus.

[0072] Since the goal is to output the electrical energy of all converter transformers to the first AC system, it is necessary to control all converter transformers to connect to the first bus and / or the second bus. Specifically, this can be achieved by controlling the switches in the AC strings containing all converter transformers.

[0073] like Figure 3 As shown, to connect the first converter transformer T1 to the AC field, it is necessary to control the switches of the second AC string, so that the first converter transformer T1 is connected to the first bus and / or the second bus. In one example, the first-side switch A2 of the second AC string 2 can be controlled to be closed, so that the first converter transformer T1 is connected to the first bus M1. The intermediate switch B2 and the second-side switch C2 of the second AC string 2 can also be controlled to be closed, so that the first converter transformer T1 is connected to the second bus M2. Alternatively, the first-side switch A2, the intermediate switch B2, and the second-side switch C2 of the second AC string 2 can all be controlled to be closed, so that the first converter transformer T1 is connected to both the first bus M1 and the second bus M2. Similarly, for the second converter transformer T2, the switches in the first AC string 1 can be controlled, so that the second converter transformer T2 is connected to the first bus M1 and / or the second bus M2.

[0074] S205. All switches controlling at least one AC string between the first busbar and the second busbar are in the closed position.

[0075] To realize full sending, the first bus and the second bus can be controlled to be connected through any one of the AC strings, i.e., all the switches of at least one AC string between the first bus and the second bus are controlled to be in the closed state. In one example, as shown in Figure 3 the first side switch A1, the middle switch B1 and the second side switch C1 of the first AC string 1 are controlled to be in the closed state, so that the first bus M1 and the second bus M2 are connected, and no matter which bus the first converter transformer T1 and the second converter transformer T2 are connected to, the electrical energy of the first converter transformer T1 and the second converter transformer T2 can be transmitted to the same AC line, i.e., full sending is realized.

[0076] Of course, the first side switch A2, the middle switch B2 and the second side switch C2 in the second AC string 2 can also be controlled to be in the closed state, so that the first bus M1 and the second bus M2 are connected through the AC string.

[0077] S206, control the line switch of the first AC line to be in the closed state, control the line switch of the second AC line to be in the open state, and control the side switch connected to the line switch of the first AC line in the AC string where the first AC line is located to be in the closed state, so that the electrical energy of all the converter transformers in the AC field is transmitted to the first AC system.

[0078] When the first bus and the second bus are connected through any one of the AC strings, to avoid loop closing, the anti-loop closing criterion can be set as follows: if the first AC line is connected to the first bus or the second bus when all the switches of any one of the AC strings between the first bus and the second bus are in the closed state, the second AC line is prohibited from being connected to the AC field, the first AC line is a line connected to the first AC system, and the second AC line is a line connected to the second AC system.

[0079] Since the conversion instruction is to transmit the electrical energy of all the converter transformers to the first AC system, after the first converter transformer T1 and the second converter transformer T2 are connected to the first bus M1 and / or the second bus M2 in S204 and S205, to avoid loop closing caused by the connection of the first AC line L11 and L12 to the second AC line L21 and L22, the line switch of the first AC line L11 and L12 connected to the first AC system can be controlled to be in the closed state, and the line switch of the second AC line connected to the second AC system can be controlled to be in the open state.

[0080] In one example, referring to Figure 3After the first side switch A1 of the first AC string 1 is controlled to be in the closed position to connect the second converter transformer T2 to the first bus M1, and the middle switch B1 and the second side switch C1 of the first AC string 1 are controlled to be in the closed position after the second converter transformer T2 is connected to the first bus M1, since the first bus M1 and the second bus M2 are connected through the first AC string 1, to make the power of the first converter transformer T1 also transmitted to the first AC line L12 or L11, the first side switch A2 of the second AC string 2 can be controlled to be in the closed position to connect the first converter transformer T1 to the first bus M1, or the second side switch C2 and the middle switch B2 of the second AC string 2 can be controlled to be in the closed position to connect the first converter transformer T1 to the second bus M2, and then the line switch on the first AC line L11 or L22 is controlled to be in the closed position, and the side switch of the AC string in which the first AC line L11 or L12 is located and connected to the line switch on the first AC line is controlled to be in the closed position.

[0081] For example, taking the first AC line L11 as an example, after the line switch Q1 on the first AC line L11 is controlled to be in the closed position, the first side switch A3 on the third AC string 3 also needs to be controlled to be in the closed position to connect the first AC line L11 to the first bus, and at the same time, to avoid loop closing, the line switch Q2 on the second AC line L21 is controlled to be in the open position, and the line switch Q4 on the second AC line L22 is controlled to be in the open position, so as to realize that the power of the first converter transformer T1 and the second converter transformer T2 is fully transmitted to the first AC system through the first AC line L11, and at the same time, the second AC system is not connected to the AC field, effectively preventing the first AC system and the second AC system from operating in loop closing mode.

[0082] In another example, referring to Figure 3 After the first side switch A2 of the second AC string 2 is controlled to be in the closed position to connect the first converter transformer T1 to the first bus M1, and the middle switch B2 and the second side switch C2 of the second AC string 2 are controlled to be in the closed position after the first converter transformer T1 is connected to the first bus M1, since the first bus M1 and the second bus M2 are connected through the second AC string 2, to make the power of the second converter transformer T2 also transmitted to the first AC line L12 or L11, the second side switch C1 of the first AC string 1 can be controlled to be in the closed position to connect the second converter transformer T2 to the second bus M2, or the first side switch A1 and the middle switch B1 of the first AC string 1 can be controlled to be in the closed position to connect the second converter transformer T2 to the first bus M1, and then the line switch on the first AC line L11 or L12 is controlled to be in the closed position, and the side switch of the AC string in which the first AC line L11 or L12 is located and connected to the line switch on the first AC line is controlled to be in the closed position.

[0083] For example, taking the first AC line L11 as an example, after controlling the line switch Q1 on the first AC line L11 to be in the closed position, the second side switch C3 and the middle switch B3 on the third AC string 3 also need to be controlled to be in the closed position, so that the first AC line L11 is connected to the second bus M2. At the same time, in order to avoid loop closing, the line switch Q2 on the second AC line L21 is controlled to be in the open position, and the line switch Q4 on the second AC line L22 is controlled to be in the open position, so as to realize that the power of the first converter transformer T1 and the second converter transformer T2 is fully transmitted to the first AC system through the first AC line L11, and at the same time, the second AC system is not connected to the AC field, effectively preventing the first AC system and the second AC system from operating in loop mode.

[0084] The skilled person can control different AC strings to connect the first bus and the second bus, and connect different converter transformers to at least one of the first bus and the second bus during the conversion from distribution to full transmission, and when the first AC system is connected to one of the buses, the second AC system is prohibited from being connected to the second bus. The skilled person can set which switch to be in the open or closed position according to the actual situation, which is not limited to the above examples.

[0085] In another optional embodiment, when the switches in the AC field satisfy the transmission operation mode conversion criterion through S202-S203, if the conversion instruction is to transmit the power of the first converter transformer to the first AC system and transmit the power of the second converter transformer to the second AC system (distribution), S207-S209 are executed.

[0086] S207, when the conversion instruction is to transmit the power of the first converter transformer to the first AC system and transmit the power of the second converter transformer to the second AC system, the first side switch of the first AC string is controlled to be in the open position, the second side switch and the middle switch are controlled to be in the closed position, and the line switch of the second AC line is controlled to be in the closed position, so that the power of the second converter transformer is output to the second bus and the second AC line.

[0087] For example, referring to Figure 3 , the power of the first converter transformer T1 needs to be transmitted to the first AC line L11 or L12, and the power of the second converter transformer T2 needs to be transmitted to the second AC line L21 or L22. The first side switch A1 of the first AC string 1 can be controlled to be in the open position, the second side switch C1 and the middle switch B1 can be controlled to be in the closed position, and the line switch Q4 of the second AC line L22 can be controlled to be in the closed position, so that the power of the second converter transformer T2 is output to the second bus M2 and the second AC line L22, the second AC line L22 is connected to the second AC system, and the second converter transformer T2 outputs power to the second AC system.

[0088] S208, controlling the first side switch and the middle switch of the second AC string to be in the closed state, the second side switch to be in the open state, and controlling the line switch of the first AC line to be in the closed state, so that the electric energy of the first converter transformer is output to the first bus and to the first AC line.

[0089] For example, referring to Figure 3 , controlling the first side switch A2 and the middle switch B2 of the second AC string 2 to be in the closed state, the second side switch C2 to be in the open state, and controlling the line switch Q3 of the first AC line L12 to be in the closed state, so that the electric energy of the first converter transformer T1 is output to the first bus M1 and to the first AC line L12, the first AC line L12 is connected to the first AC system, and the first converter transformer T1 outputs electric energy to the first AC system.

[0090] S209, controlling the middle switch of the third AC string to be in the open state.

[0091] For example, referring to Figure 3 , controlling the middle switch B3 to be in the open state, the first AC line L11 to be connected to the first bus M1, the second AC line L21 to be connected to the second bus M2, and the first bus M1 and the second bus M2 not to be connected through the AC string, at this time, the electric energy output by the first AC transformer T1 is to the first bus M1 and the first AC line L1, and the electric energy output by the second AC transformer T2 is to the second bus M2 and the second AC line L2, completing the conversion of the transmission operation mode.

[0092] The technical scheme of the embodiment, by receiving the transmission operation mode conversion instruction, acquiring the switch state of the line switch on the AC line and the switch of the AC string, controlling the line switch of the AC line and the switch of the AC string to make the switch state of the line switch of the AC line and the switch of the AC string meet the preset transmission operation mode conversion criterion, based on the preset anti-loop criterion to control the line switch on each AC line and the switch of each AC string, convert the transmission operation mode of the AC field to meet the demand of the conversion instruction, avoid the occurrence of misoperation, by pre-setting the transmission operation mode conversion criterion and the anti-loop criterion, when the switch state meets the transmission operation mode conversion, the switch is controlled to act according to the anti-loop criterion to realize the transmission operation mode conversion, without manual operation, avoiding the misoperation of manual operation to appear loop operation, ensuring the safety and reliability of the transmission operation mode conversion, effectively protecting the converter transformer from being damaged, prolonging the service life of the converter transformer.

[0093] Embodiment three

[0094] Figure 4A structure schematic view of a power transmission operation mode conversion device provided for the third embodiment of the present application is applied to power transmission operation mode conversion of an AC field, the AC field comprising a first bus, a second bus and an AC string between the first bus and the second bus, the AC string being connected with a converter transformer and connected with an AC line through a line switch. As shown in Figure 3 the power transmission operation mode conversion device comprises:

[0095] a switch state acquisition module 310, configured to acquire, in real time, switch states of the line switch on the AC line and switches of the AC string when a power transmission operation mode conversion instruction is given;

[0096] a switch state control module 320, configured to control the line switch on the AC line and the switches of the AC string according to a preset power transmission operation mode conversion criterion, so that the switch states of the line switch on the AC line and the switches of the AC string satisfy the preset power transmission operation mode conversion criterion;

[0097] a power transmission operation mode conversion module 330, configured to control the line switch on each AC line and the switches of each AC string according to a preset loop closing prevention criterion, so as to convert the power transmission operation mode of the AC field.

[0098] Optionally, the power transmission operation mode conversion criterion can comprise that two converter transformers are prohibited to be connected to the same bus, and the middle switch of the AC string connected with different AC lines is in a split state.

[0099] Optionally, the switch state control module 320 comprises:

[0100] an AC line switch control unit, configured to control the side switch of the AC string connected with the second converter transformer and connected with the first bus to be in a split state, and control the side switch of the AC string connected with the first converter transformer and connected with the second bus to be in a split state;

[0101] an AC string switch control unit, configured to control the middle switch of the AC string connected with the first AC line and the second AC line to be in a split state.

[0102] Optionally, the loop closing prevention criterion can comprise that if the first AC line is connected to the first bus or the second bus, the second AC line is prohibited to be connected to the AC field when the switches of any AC string between the first bus and the second bus are all in a closed state, the first AC line is a line connected to a first AC system, and the second AC line is a line connected to a second AC system.

[0103] Optionally, the power transmission operation mode conversion module 330 comprises:

[0104] a first AC system control unit, configured to control switches in an AC string in which all the converter transformers are located, so that the converter transformers are connected to the first bus and / or the second bus, when the conversion instruction is to output electric energy of all the converter transformers to the first AC system;

[0105] a full AC string control unit, configured to control all the switches in at least one of the AC strings between the first bus and the second bus to be in the closed state;

[0106] a loop-prevention criterion judgment unit, configured to control a line switch of the first AC line to be in the closed state, control a line switch of the second AC line to be in the open state, and control an edge switch of an AC string in which the first AC line is located and connected to the line switch on the first AC line to be in the closed state, so that electric energy of all the converter transformers in the AC field is transmitted to the first AC system.

[0107] Optionally, the loop-prevention criterion further includes that, when at least one of the switches in each of the AC strings is in the open state, the first AC line and the second AC line are prohibited from being connected to the first bus or the second bus at the same time, and the first AC line and the second AC line are prohibited from being connected through the middle switch of the AC string.

[0108] Optionally, the AC field adopts a two-thirds connection mode, and the AC field includes a first AC string, a second AC string, and a third AC string, each of the AC strings includes a first edge switch, a middle switch, and a second edge switch connected between the first bus and the second bus in sequence, two ends of the middle switch of the first AC string are connected to a second converter transformer and a second AC line respectively, two ends of the middle switch of the second AC string are connected to a first converter transformer and a first AC line respectively, and two ends of the middle switch of the third AC string are connected to the first AC line and the second AC line respectively.

[0109] Optionally, the power transmission operation mode conversion module 330 further includes:

[0110] a second AC system control unit, configured to control the first edge switch of the first AC string to be in the open state, the second edge switch and the middle switch to be in the closed state, and the line switch of the second AC line to be in the closed state, so that electric energy of the second converter transformer is output to the second bus and the second AC line, when the conversion instruction is to transmit electric energy of the first converter transformer to the first AC system and transmit electric energy of the second converter transformer to the second AC system.

[0111] The AC string distribution control unit controls the first side switch and the middle switch of the second AC string to be in the closed state, the second side switch to be in the open state, and the line switch of the first AC line to be in the closed state, so that the electric energy of the first converter transformer is output to the first bus and to the first AC line.

[0112] The third AC string control unit controls the middle switch of the third AC string to be in the open state.

[0113] The power transmission operation mode conversion device provided by the embodiments of the present application can execute the power transmission operation mode conversion method provided by any of the embodiments of the present application, and has the corresponding function modules and beneficial effects of the execution method.

[0114] Embodiment four

[0115] Figure 5 A structural schematic diagram of an electronic device 40 that can be used to implement embodiments of the present application is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit the implementations of the present application described and / or claimed in this document.

[0116] As shown in Figure 4 The electronic device 40 includes at least one processor 41, and a memory, such as a read-only memory (ROM) 42, a random access memory (RAM) 43, etc., which are communicatively connected to the at least one processor 41, wherein the memory stores a computer program that can be executed by the at least one processor. The processor 41 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 42 or the computer program loaded from the storage unit 48 into the random access memory (RAM) 43. In the RAM 43, various programs and data required for the operation of the electronic device 40 can also be stored. The processor 41, the ROM 42, and the RAM 43 are connected to each other through a bus 44. An input / output (I / O) interface 45 is also connected to the bus 44.

[0117] A plurality of components in the electronic device 40 are connected to the I / O interface 45, including: an input unit 46, such as a keyboard, a mouse, etc.; an output unit 47, such as various types of displays, speakers, etc.; a storage unit 48, such as a magnetic disk, an optical disk, etc.; and a communication unit 49, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 49 allows the electronic device 40 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0118] The processor 41 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the processor 41 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 41 performs various methods and processes described above, such as the power operation mode conversion method.

[0119] In some embodiments, the power operation mode conversion method can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 48. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 40 via the ROM 42 and / or the communication unit 49. When the computer program is loaded onto the RAM 43 and executed by the processor 41, one or more steps of the power operation mode conversion method described above can be performed. Alternatively, in other embodiments, the processor 41 can be configured to perform the power operation mode conversion method by any other appropriate means, such as by means of firmware.

[0120] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0121] Computer programs for implementing the methods of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer program, when executed, can cause instructions defined in the flow charts and / or block diagrams to be implemented. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a stand-alone software package and partially on a remote machine or entirely on a remote machine or server.

[0122] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0123] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0124] The systems and techniques described here can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here, or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0125] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0126] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the present disclosure can be executed in parallel, executed in sequence, or executed in a different order, all without departing from the desired result of the technical solutions of the present disclosure, and this is not limited herein.

[0127] The above detailed description does not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0128] Example Five

[0129] The embodiment provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the power transmission operation mode conversion method according to any of the embodiments of the present application.

[0130] Those skilled in the art can clearly understand the present application by the above description of the embodiments, and the present application can be realized by software and necessary general hardware, and of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, such as a floppy disk, a read-only memory (ROM), a random access memory (RAM), a FLASH, a hard disk, or an optical disc, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present application.

[0131] It is noted that the above are only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A power transmission operation mode conversion method characterized by comprising: The application is applied to transmission operation mode conversion of an AC field, the AC field comprises a first bus, a second bus and an AC string between the first bus and the second bus, the AC string is connected with a converter transformer and connected with an AC line through a line switch, and the application comprises: Upon receiving a transmission operation mode conversion instruction, obtaining the switch state of the line switch on the AC line and the switch of the AC string; According to a preset transmission operation mode conversion criterion, controlling the line switch on the AC line and the switch of the AC string so that the switch state of the line switch on the AC line and the switch of the AC string meets the preset transmission operation mode conversion criterion; According to a preset anti-loop criterion, controlling the line switch on each AC line and the switch of each AC string to convert the transmission operation mode of the AC field; The transmission operation mode conversion criterion comprises: the same bus is prohibited from accessing two converter transformers, and the middle switch of the AC string connected with different AC lines is in a split state; The anti-loop criterion comprises a first anti-loop criterion and a second anti-loop criterion; The first anti-loop criterion comprises: if the first AC line is connected to the first bus or the second bus when the switch of any AC string between the first bus and the second bus is in a closed state, the second AC line is prohibited from accessing the AC field, the first AC line is a line connected to a first AC system, and the second AC line is a line connected to a second AC system; The second anti-loop criterion comprises: when at least one of the switches of each AC string is in a split state, the first AC line and the second AC line are prohibited from being connected to the first bus or the second bus at the same time, and the first AC line and the second AC line are prohibited from being connected through the middle switch of the AC string.

2. The power running mode conversion method according to claim 1, wherein The converter transformer comprises a first converter transformer and a second converter transformer, and the control of the line switch on the AC line and the switch of the AC string according to the preset transmission operation mode conversion criterion comprises: controlling the side switch of the AC string connected with the second converter transformer and connected with the first bus to be in a split state, and controlling the side switch of the AC string connected with the first converter transformer and connected with the second bus to be in a split state; controlling the middle switch of the AC string connected with the first AC line and the second AC line to be in a split state.

3. The power running mode conversion method according to any one of claims 1 to 2, characterized by, If the anti-loop criterion is the first anti-loop criterion, the control of the line switch on each AC line and the switch of each AC string according to the anti-loop criterion to convert the transmission operation mode of the AC field comprises: when the conversion instruction is to output the power of all converter transformers to the first AC system, controlling the switches in the AC string where the converter transformers are located so that the converter transformers are connected to the first bus and / or the second bus; controlling all switches of at least one AC string between the first bus and the second bus to be in a closed state. The line switch of the first AC line is controlled to be in a closed state, the line switch of the second AC line is controlled to be in an open state, and the side switch connected to the line switch on the first AC line in the AC string of the first AC line is controlled to be in a closed state, so that the power of all the converter transformers of the AC field is transmitted to the first AC system.

4. The power running mode conversion method according to claim 1, wherein If the anti-looping criterion is a second anti-looping criterion, the AC field adopts a two-thirds connection mode and comprises a first AC string, a second AC string and a third AC string, each AC string comprising a first side switch, a middle switch and a second side switch connected in sequence between a first bus and a second bus, two ends of the middle switch of the first AC string being connected to a second converter transformer and a second AC line respectively, two ends of the middle switch of the second AC string being connected to a first converter transformer and a first AC line respectively, and two ends of the middle switch of the third AC string being connected to the first AC line and the second AC line respectively; The control of the line switch on each AC line and the switch of each AC string according to the anti-looping criterion to convert the power transmission operation mode of the AC field comprises: When the conversion instruction is to transmit the power of the first converter transformer to the first AC system and transmit the power of the second converter transformer to the second AC system, the first side switch of the first AC string is controlled to be in an open state, the second side switch and the middle switch are controlled to be in a closed state, the line switch of the second AC line is controlled to be in a closed state, so that the power of the second converter transformer is output to the second bus and the second AC line; The first side switch and the middle switch of the second AC string are controlled to be in a closed state, the second side switch is controlled to be in an open state, and the line switch of the first AC line is controlled to be in a closed state, so that the power of the first converter transformer is output to the first bus and the first AC line; The middle switch of the third AC string is controlled to be in an open state.

5. A power transmission mode switching device, characterized by comprising: A power transmission operation mode conversion method for an AC field, the AC field comprising a first bus, a second bus and an AC string between the first bus and the second bus, the AC string being connected to a converter transformer and connected to an AC line through a line switch, the method comprising: a switch state acquisition module configured to acquire, in real time, a switch state of the line switch on the AC line and the switch of the AC string when a conversion instruction of a power transmission operation mode is received; a switch state control module configured to control the line switch on the AC line and the switch of the AC string according to a preset power transmission operation mode conversion criterion, so that the switch state of the line switch on the AC line and the switch of the AC string meets the preset power transmission operation mode conversion criterion; a power transmission operation mode conversion module configured to control the line switch on each AC line and the switch of each AC string according to a preset anti-looping criterion to convert the power transmission operation mode of the AC field; The power transmission operation mode conversion criterion comprises: a same bus is prohibited from being connected to two converter transformers, and a middle switch of an AC string connected to different AC lines is in an open state. The anti-looping criterion comprises a first anti-looping criterion and a second anti-looping criterion. The first anti-looping criterion comprises: if a first AC line is connected to the first busbar or the second busbar, the second AC line is prohibited from being connected to the AC field when all switches of any one of the AC strings between the first busbar and the second busbar are in the closed state, the first AC line is a line connected to the first AC system, and the second AC line is a line connected to the second AC system. The second anti-looping criterion comprises: when at least one of the switches of each AC string is in the open state, the first AC line and the second AC line are prohibited from being connected to the first busbar or the second busbar at the same time, and the first AC line and the second AC line are prohibited from being connected through the middle switch of the AC string.

6. The power running mode switching apparatus of claim 5, wherein If the anti-looping criterion is the first anti-looping criterion, the power transmission operation mode conversion module comprises: a first AC system control unit configured to control the switches in the AC string in which the converter transformer is located so that the converter transformer is connected to the first busbar and / or the second busbar when the conversion instruction is to output the power of all converter transformers to the first AC system; an AC string control unit configured to control all switches of at least one AC string between the first busbar and the second busbar to be in the closed state; an anti-looping criterion judgment unit configured to control the line switch of the first AC line to be in the closed state, control the line switch of the second AC line to be in the open state, and control the side switch of the AC string in which the first AC line is located and which is connected to the line switch on the first AC line to be in the closed state, so that the power of all converter transformers of the AC field is transmitted to the first AC system.

7. An electronic device, comprising: The electronic device comprises: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the power transmission operation mode conversion method in any one of claims 1-4.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for enabling the processor to execute the power transmission operation mode conversion method in any one of claims 1-4 when executed.

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