Method for judging switching-on position of isolating switch in hot reverse bus operation

Abstract

The embodiment of the invention discloses a method for judging the closing position of a hot reverse bus operation isolating switch. The method comprises the following steps: determining a first three-phase current of a first isolating switch and a second three-phase current of a second isolating switch according to bus switching interval information, an opening and closing state of the first isolating switch and an opening and closing state of the second isolating switch; determining a third three-phase current of the first isolation switch and a fourth three-phase current of the second isolation switch according to the outgoing line interval information of each outgoing line interval, the second bus coupler interval information and the connection relationship between each outgoing line interval and the first bus and the second bus; and according to the first bus-tie interval information, the second bus-tie interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current, determining whether the three-phase imbalance change occurs in the internal power flow of the bus loop so as to deduce and judge the closing position of the thermal reverse bus operation isolation switch.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of substations, and in particular to a method for determining the closing position of a disconnecting switch for thermal busbar reversal operation. Background Art

[0002] In recent years, many busbar decompression accidents or even substation power outages and decompression accidents during hot busbar reversal operations were caused by failure to promptly discover the slight gap between the moving and static contacts after the disconnector was operated, and continuing to operate the other busbar side disconnector. However, it is difficult to discover the poor contact caused by the slight gap between the moving and static contacts through on-site inspection of the disconnector position and the backstage and secondary device indication of the disconnector position.

[0003] With the advancement of the integrated control target model, the problem of lack of real-time and effective monitoring means for poor contact monitoring of disconnectors has become increasingly prominent, making misoperation caused by poor contact of disconnectors a prominent risk that restricts the advancement of programmed operations. Since the programmed operation process does not require human participation, the existing methods of confirming that the disconnector is closed in place through auxiliary contacts, micro switches, and cameras still cannot reliably ensure that the disconnector is closed in place. Summary of the invention

[0004] The embodiment of the present invention provides a method for judging the closing position of a disconnect switch for a thermal busbar reversal operation, so as to accurately monitor the closing position of a disconnect switch for a thermal busbar reversal operation in real time.

[0005] In a first aspect, an embodiment of the present invention provides a method for determining the closing position of a disconnector switch operated by a thermal busbar reversal operation, the method comprising:

[0006] According to the busbar topology diagram of the substation to be detected, the first substation information before the hot busbar reversal operation and the second substation information during the hot busbar reversal operation are determined; wherein the first substation information includes the busbar reversal interval information, the first busbar coupling interval information, the opening and closing status of the first disconnector, and the opening and closing status of the second disconnector; the second substation information includes the outgoing line interval information of each outgoing line interval, the second busbar coupling interval information, and the connection relationship between each outgoing line interval and the first busbar and the second busbar;

[0007] Determine the first three-phase current of the first isolating switch and the second three-phase current of the second isolating switch according to the inverted bus interval information of each of the outgoing line intervals, the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch;

[0008] Determine the third three-phase current of the first disconnector and the fourth three-phase current of the second disconnector according to the outgoing line interval information, the second bus-tie interval information, and the connection relationship between each of the outgoing line intervals and the first bus and the second bus;

[0009] The closing position of the hot-reversed busbar operation disconnect switch is determined based on the first busbar interval information, the second busbar interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current.

[0010] Optionally, the step of determining the first three-phase current of the first isolating switch and the second three-phase current of the second isolating switch includes:

[0011] Determine the closing switch and the opening switch according to the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch;

[0012] Calculating the three-phase current of the inverted bus interval according to the inverted bus interval information;

[0013] If the first isolating switch is a closing switch and the second isolating switch is an opening switch, the first three-phase current is the three-phase current of the reverse bus interval, and the second three-phase current is 0;

[0014] If the first isolating switch is an opening switch and the second isolating switch is a closing switch, the first three-phase current is 0, and the second three-phase current is the three-phase current of the inverted busbar.

[0015] Optionally, the reverse bus interval information includes reverse bus three-phase current value, reverse bus active power and reverse bus reactive power;

[0016] The step of calculating the three-phase current of the inverted bus interval includes:

[0017] Determine the inverted bus phase A of the inverted bus interval phase A current relative to the A phase bus voltage according to the inverted bus active power and the inverted bus reactive power;

[0018] According to the phase of the inverted mother phase A, determining the phase of the inverted mother phase B and the phase of the inverted mother phase C;

[0019] The inverted bus interval three-phase current is calculated according to the inverted bus three-phase current value, the inverted bus A phase, the inverted bus B phase and the inverted bus C phase.

[0020] Optionally, after determining the first power conversion information before the hot bus reverse operation and before determining the second power conversion information during the hot bus reverse operation, the method further includes:

[0021] Determining the hot busbar reversing operation isolating switch according to the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch;

[0022] Control the thermal busbar operation disconnecting switch to close.

[0023] Optionally, the step of determining a third three-phase current of the first isolating switch and a fourth three-phase current of the second isolating switch comprises:

[0024] Calculating the three-phase current of the bus-coupler interval according to the second bus-coupler interval information;

[0025] Calculating the three-phase current of each outgoing line interval according to the outgoing line interval information of each outgoing line interval;

[0026] Determine a first three-phase total current of all the outgoing line intervals connected to the first busbar and a second three-phase total current of all the outgoing line intervals connected to the second busbar according to the connection relationship between each outgoing line interval and the first busbar and the second busbar and the outgoing line interval three-phase current of each outgoing line interval;

[0027] The third three-phase current and the fourth three-phase current are calculated according to the first three-phase total current, the second three-phase total current and the bus-tie interval three-phase current.

[0028] Optionally, the second bus-coupler interval information includes the second bus-coupler three-phase current value, bus-coupler active power and bus-coupler reactive power;

[0029] The step of calculating the three-phase current of the bus-tie interval comprises:

[0030] Determine the bus coupling A phase of the bus coupling interval A phase current relative to the A phase bus voltage according to the bus coupling active power and the bus coupling reactive power;

[0031] According to the phase of the bus coupling phase A, determine the phase of the bus coupling phase B and the phase of the bus coupling phase C;

[0032] Calculate the bus-couple interval three-phase current according to the second bus-couple three-phase current value, the bus-couple A phase, the bus-couple B phase and the bus-couple C phase;

[0033] The outgoing line interval information includes the outgoing line three-phase current value, the outgoing line active power and the outgoing line reactive power;

[0034] The step of calculating the three-phase current of each outgoing line interval comprises:

[0035] Determine the outgoing line A phase of the A phase current of each outgoing line interval relative to the A phase bus voltage according to the outgoing line active power and the outgoing line reactive power of each outgoing line interval;

[0036] According to the phase of the outgoing line A phase of each of the outgoing line intervals, determining the phase of the outgoing line B phase and the phase of the outgoing line C phase of each of the outgoing line intervals;

[0037] The three-phase current of each of the outgoing line intervals is calculated according to the outgoing line three-phase current value of each of the outgoing line intervals, the outgoing line A phase, the outgoing line B phase phase, and the outgoing line C phase phase.

[0038] Optionally, the third three-phase current I 3 for:

[0039]

[0040] Wherein, N1 is the total number of all the outgoing line intervals connected to the first busbar, i is the order of the outgoing line intervals connected to the first busbar, and I i is the three-phase current of the outgoing line interval of the i-th outgoing line interval (i is a positive integer), and the direction of the three-phase current of the outgoing line interval flowing out of the first busbar or the second busbar is the positive direction, I M is the three-phase current of the bus-coupler interval, and the direction in which the three-phase current of the bus-coupler interval flows from the first bus to the second bus is the positive direction;

[0041] The fourth three-phase current I 4 for:

[0042]

[0043] Wherein, N2 is the total number of all the outgoing line intervals connected to the second busbar, j is the order of the outgoing line intervals connected to the second busbar, and I j is the three-phase current of the j-th outgoing line interval (j is a positive integer).

[0044] Optionally, the step of determining the closing position of the disconnect switch for thermal busbar operation includes:

[0045] Determine a bus-tie three-phase current change rate according to the first bus-tie interval information and the second bus-tie interval information;

[0046] Determine the closing switch according to the opening and closing state of the first isolating switch and the opening and closing state of the second isolating switch;

[0047] If the first isolating switch is a closing switch, determining a first three-phase current change rate according to the first three-phase current and the third three-phase current;

[0048] If the second isolating switch is a closing switch, determining a second three-phase current change rate according to the second three-phase current and the fourth three-phase current;

[0049] Determining the unbalance degree of the bus-couple three-phase current according to the second bus-couple interval information;

[0050] Determining the unbalance degree of the first three-phase current according to the third three-phase current;

[0051] determining a second three-phase current imbalance degree according to the fourth three-phase current;

[0052] If the first isolating switch is a closing switch, the closing position of the isolating switch for hot-bus operation is determined according to the bus tie three-phase current change rate, the first three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance;

[0053] If the second isolating switch is a closing switch, the closing position of the hot-reversing busbar operating isolating switch is determined based on the busbar three-phase current change rate, the second three-phase current change rate, the busbar three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance.

[0054] Optionally, the first bus-coupler interval information includes a first bus-coupler three-phase current value, and the first bus-coupler three-phase current value includes a first bus-coupler A-phase current value, a first bus-coupler B-phase current value, and a first bus-coupler C-phase current value;

[0055] The second bus coupling interval information includes the second bus coupling three-phase current value, and the second bus coupling three-phase current value includes the second bus coupling A phase current value, the second bus coupling B phase current value and the second bus coupling C phase current value;

[0056] The first three-phase current includes a first A-phase current, a first B-phase current and a first C-phase current;

[0057] The second three-phase current includes a second A-phase current, a second B-phase current and a second C-phase current;

[0058] The third three-phase current includes a third A-phase current, a third B-phase current and a third C-phase current;

[0059] The fourth three-phase current includes a fourth A-phase current, a fourth B-phase current and a fourth C-phase current;

[0060] The bus-couple three-phase current change rate includes the bus-couple A phase current change rate, the bus-couple B phase current change rate and the bus-couple C phase current change rate;

[0061] The first three-phase current change rate includes a first A-phase current change rate, a first B-phase current change rate, and a first C-phase current change rate;

[0062] The second three-phase current change rate includes a second A-phase current change rate, a second B-phase current change rate, and a second C-phase current change rate;

[0063] The step of determining the bus-tie three-phase current change rate comprises:

[0064] Calculating the bus coupler A phase current change rate according to the first bus coupler A phase current value and the second bus coupler A phase current value;

[0065] Calculating the bus coupling B phase current change rate according to the first bus coupling B phase current value and the second bus coupling B phase current value;

[0066] Calculating the bus coupler C phase current change rate according to the first bus coupler C phase current value and the second bus coupler C phase current value;

[0067] The step of determining the first three-phase current change rate comprises:

[0068] Calculating a change rate of the first A-phase current according to the first A-phase current and the third A-phase current;

[0069] Calculating a change rate of the first B-phase current according to the first B-phase current and the third B-phase current;

[0070] Calculating a change rate of the first C-phase current according to the first C-phase current and the third C-phase current;

[0071] The step of determining the second three-phase current change rate comprises:

[0072] Calculating the second A-phase current change rate according to the second A-phase current and the fourth A-phase current;

[0073] Calculating a change rate of the second B-phase current according to the second B-phase current and the fourth B-phase current;

[0074] Calculating a change rate of the second C-phase current according to the second C-phase current and the fourth C-phase current;

[0075] The step of measuring the unbalance degree of the busbar three-phase current comprises:

[0076] Determine a maximum bus-couple phase current value and a minimum bus-couple phase current value of the second bus-couple A phase current value, the second bus-couple B phase current value, and the second bus-couple C phase current value;

[0077] Calculating the bus coupling three-phase current imbalance according to the maximum bus coupling phase current value and the minimum bus coupling phase current value;

[0078] The step of determining the first three-phase current imbalance degree comprises:

[0079] Determine a first maximum phase current value and a first minimum phase current value of the third A-phase current, the third B-phase current, and the third C-phase current;

[0080] Calculating the first three-phase current imbalance degree according to the first maximum phase current value and the first minimum phase current value;

[0081] The step of determining the second three-phase current unbalance degree comprises:

[0082] Determine a second maximum phase current value and a second minimum phase current value of the fourth A-phase current, the fourth B-phase current, and the fourth C-phase current;

[0083] The second three-phase current imbalance degree is calculated according to the second maximum phase current value and the second minimum phase current value.

[0084] Optionally, if the first isolating switch is a closing switch, judging the closing position of the isolating switch for hot bus operation according to the bus tie three-phase current change rate, the first three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance includes:

[0085] If the busbar three-phase current change rate or the first three-phase current change rate is less than the preset current change rate threshold, and any one of the busbar three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance is greater than the preset imbalance threshold, then the hot busbar operation disconnecting switch is not closed in place; otherwise, the hot busbar operation disconnecting switch is closed in place;

[0086] If the second isolating switch is a closing switch, judging the closing position of the isolating switch for hot bus operation according to the bus tie three-phase current change rate, the second three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance, including:

[0087] If the busbar three-phase current change rate or the second three-phase current change rate is less than the preset current change rate threshold, and any one of the busbar three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance is greater than the preset imbalance threshold, then the thermal busbar operation isolating switch is not closed in place; otherwise, the thermal busbar operation isolating switch is closed in place.

[0088] The embodiment of the present invention can determine the first three-phase current of the first isolating switch and the second three-phase current of the second isolating switch through the busbar reversal interval information, the opening and closing status of the first isolating switch, and the opening and closing status of the second isolating switch; determine the third three-phase current of the first isolating switch and the fourth three-phase current of the second isolating switch according to the outgoing line interval information of each outgoing line interval, the second busbar interval information, and the connection relationship between each outgoing line interval and the first bus and the second bus; and then judge the current change rate and three-phase current imbalance of the busbar circuit breaker, the first isolating switch and the second isolating switch according to the first busbar interval information, the second busbar interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current, and then determine whether the internal flow of the busbar loop has changed, so as to infer whether the closing of the isolating switch for hot bus reversal operation is in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0090] Figure 1 A schematic flow chart of a method for determining the closing position of a disconnect switch in a hot busbar reversal operation according to an embodiment of the present invention;

[0091] Figure 2 A schematic flow chart of a step of determining a first three-phase current of a first isolating switch and a second three-phase current of a second isolating switch provided in an embodiment of the present invention;

[0092] Figure 3 A schematic flow chart of the steps of calculating the three-phase current of the reverse bus interval provided by an embodiment of the present invention;

[0093] Figure 4 A schematic flow chart of a step of determining a third three-phase current of a first isolating switch and a fourth three-phase current of a second isolating switch provided in an embodiment of the present invention;

[0094] Figure 5 A schematic flow chart of a step of calculating a bus-coupling interval three-phase current provided by an embodiment of the present invention;

[0095] Figure 6 A schematic flow chart of a step of calculating the three-phase current of each outgoing line interval provided by an embodiment of the present invention;

[0096] Figure 7 A schematic flow chart of the steps for determining the closing position of a disconnect switch for a hot-reversed busbar operation is provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0097] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0098] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0099] Figure 1 The present invention provides a flow chart of a method for determining the closing position of a disconnector in a hot bus operation. This embodiment is applicable to monitoring the closing of a disconnector during a hot bus operation. The method can be implemented by a device for determining the closing position of a disconnector in a hot bus operation. The method specifically includes the following steps:

[0100] S110. According to the bus topology diagram of the substation to be tested, determine the first substation information before the hot bus reversal operation and the second substation information during the hot bus reversal operation; wherein the first substation information includes the bus reversal interval information, the first bus coupling interval information, the open and closed states of the first disconnector, and the open and closed states of the second disconnector; the second substation information includes the outgoing line interval information of each outgoing line interval, the second bus coupling interval information, and the connection relationship between each outgoing line interval and the first bus and the second bus.

[0101] Specifically, the busbar topology diagram of the substation to be detected is constructed in advance according to the actual distribution of the substation to be detected. The first substation information refers to the operation information of the substation busbar reversing interval, busbar coupling interval and outgoing line interval before the hot busbar reversing operation. For example, the busbar reversing interval information, the first busbar coupling interval information, the opening and closing status of the first disconnector and the opening and closing status of the second disconnector, etc. The second substation information refers to the operation information of the substation busbar reversing interval, busbar coupling interval and outgoing line interval after the hot busbar reversing operation. For example, the outgoing line interval information of each outgoing line interval, the second busbar coupling interval information and the connection relationship between each outgoing line interval and the first bus and the second bus, etc.

[0102] Among them, the busbar reversal interval refers to the interval equipment area involved in the busbar reversal operation of the power system. The busbar reversal interval information is the operating parameters (such as current value and power, etc.) of the interval equipment involved before the hot busbar reversal operation. Before the hot busbar reversal operation, one disconnector on the busbar side of the busbar reversal interval is in a closed state, and the other is in an open state, so as to achieve simultaneous connection with one busbar. The busbar coupling interval refers to the interval equipment area connecting two sections of the busbar in the power system. The first busbar coupling interval information is the operating parameters (such as current value and power, etc.) of the interval equipment connecting the two sections of the busbar before the hot busbar reversal operation, and the second busbar coupling interval information is the operating parameters (such as current value and power, etc.) of the interval equipment connecting the two sections of the busbar during the hot busbar reversal operation. The disconnectors on the busbar side of the busbar coupling interval before and during the hot busbar reversal operation are all in a closed state, so as to achieve simultaneous connection with two busbars. The first disconnector and the second disconnector refer to the disconnectors on the busbar side of the busbar reversal interval. The outgoing line bay refers to the important bay area in the power system that connects the substation with the external lines. The outgoing line bay information refers to the operating information of the equipment in the important bay area connected to the external lines (such as current value and power, etc.). During the hot busbar operation, each outgoing line bay is connected to a busbar.

[0103] S120. Determine a first three-phase current of the first isolating switch and a second three-phase current of the second isolating switch according to the inverted bus interval information, the opening and closing states of the first isolating switch, and the opening and closing states of the second isolating switch.

[0104] Specifically, the connection state of the first isolating switch and the second isolating switch with the bus before the hot bus operation can be determined according to the opening and closing state of the first isolating switch and the opening and closing state of the second isolating switch. Among them, before the hot bus operation, only one isolating switch is connected to the bus. According to the connection state of the first isolating switch and the second isolating switch with the bus, it can be known which isolating switch's operating parameter for the bus interval information. Exemplarily, if the opening and closing state of the first isolating switch is a closed state, it means that the first isolating switch is connected to the bus, and thus the bus interval information is the operating parameter of the first isolating switch. The opening and closing state of the second isolating switch is an open state, which means that the second isolating switch is not connected to the bus, and thus the operating parameter of the second isolating switch is 0. If the opening and closing state of the second isolating switch is a closed state, it means that the second isolating switch is connected to the bus, and thus the bus interval information is the operating parameter of the second isolating switch. The opening and closing state of the first isolating switch is an open state, which means that the first isolating switch is not connected to the bus, and thus the operating parameter of the first isolating switch is 0.

[0105] In addition, the first three-phase current of the first isolating switch can be calculated according to the operating parameters of the first isolating switch, and the second three-phase current of the second isolating switch can be calculated according to the operating parameters of the second isolating switch. Exemplarily, if the operating parameters of the first isolating switch are inverted bus interval information, the current value and power value flowing through the first isolating switch can be obtained, and the vector current of the three phases of the first isolating switch, that is, the first three-phase current, can be determined according to the current value and power value flowing through the first isolating switch. If the operating parameter of the second isolating switch is 0, the second three-phase current is 0. If the operating parameter of the second isolating switch is inverted bus interval information, the current value and power value flowing through the second isolating switch can be obtained, and the vector current of the three phases of the second isolating switch, that is, the second three-phase current, can be determined according to the current value and power value flowing through the second isolating switch. If the operating parameter of the first isolating switch is 0, the first three-phase current is 0.

[0106] S130. Determine the third three-phase current of the first disconnector and the fourth three-phase current of the second disconnector according to the outgoing line interval information of each outgoing line interval, the second bus-tie interval information, and the connection relationship between each outgoing line interval and the first bus and the second bus.

[0107] Among them, the vector three-phase current of each outgoing line interval can be determined according to the outgoing line interval information of each outgoing line interval, and the vector three-phase current of the bus tie interval during the hot bus operation can be determined according to the second bus tie interval information. The outgoing line interval of the first bus output vector three-phase current and the outgoing line interval of the second bus output vector three-phase current can be determined according to the connection relationship between each outgoing line interval and the first bus and the second bus. According to the characteristic that the input current and output current of each bus are equal, the vector current-third three-phase current flowing through the three phases of the first disconnector and the vector current-fourth three-phase current flowing through the three phases of the second disconnector during the hot bus operation can be determined.

[0108] S140. Determine the closing position of the hot-reversed busbar operation disconnect switch according to the first busbar interval information, the second busbar interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current.

[0109] Among them, during the hot bus-reversing operation, it is necessary to close the disconnected isolating switch on the bus side of the bus-reversing interval. At this time, there will be a problem of insufficient closing of the isolating switch, which will cause poor contact in the bus circuit and cause the bus circuit to fail.

[0110] If the hot-reversing busbar operation disconnecting switch is not closed properly, the busbar circuit will have a poor contact defect, the internal power flow of the busbar constituting the closed loop will change in three-phase imbalance, and the current amplitude of the phase with poor contact will deviate from the current amplitude of the normal phase, causing abnormal current change rate and three-phase current imbalance in the bus tie circuit breaker, the first disconnecting switch and the second disconnecting switch; if the hot-reversing busbar operation disconnecting switch is closed properly, the busbar circuit will not have a poor contact defect, and the internal power flow of the busbar constituting the closed loop will not change in three-phase imbalance, causing abnormal current change rate and three-phase current imbalance in the bus tie circuit breaker, the first disconnecting switch and the second disconnecting switch.

[0111] Specifically, the current change rate of the bus-tie circuit breaker can be determined according to the first bus-tie interval information and the second bus-tie interval information, and the three-phase current imbalance of the bus-tie circuit breaker can be determined according to the second bus-tie interval information; the current change rate of the first disconnector can be determined according to the first three-phase current and the third three-phase current, and the three-phase imbalance of the first disconnector can be determined according to the third three-phase current; the current change rate of the second disconnector can be determined according to the second three-phase current and the fourth three-phase current, and the three-phase imbalance of the second disconnector can be determined according to the fourth three-phase current.

[0112] The embodiment of the present invention can determine the first three-phase current of the first isolating switch and the second three-phase current of the second isolating switch through the busbar reversal interval information, the opening and closing status of the first isolating switch, and the opening and closing status of the second isolating switch; determine the third three-phase current of the first isolating switch and the fourth three-phase current of the second isolating switch according to the outgoing line interval information of each outgoing line interval, the second busbar interval information, and the connection relationship between each outgoing line interval and the first bus and the second bus; and then judge the current change rate and three-phase current imbalance of the busbar circuit breaker, the first isolating switch and the second isolating switch according to the first busbar interval information, the second busbar interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current, and then determine whether the internal flow of the busbar loop has changed, so as to infer whether the closing of the isolating switch for hot bus reversal operation is in place.

[0113] Based on the above embodiment, optionally, Figure 2 A flow chart of the steps of determining a first three-phase current of a first isolating switch and a second three-phase current of a second isolating switch provided in an embodiment of the present invention. Figure 2 As shown, the steps of determining the first three-phase current of the first isolating switch and the second three-phase current of the second isolating switch are described:

[0114] S210. Determine a closing switch and an opening switch according to the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch.

[0115] Specifically, if the opening and closing state of the first isolating switch is closed and the opening and closing state of the second isolating switch is open, the first isolating switch is the closing switch and the second isolating switch is the opening switch; if the opening and closing state of the first isolating switch is open and the opening and closing state of the second isolating switch is closed, the first isolating switch is the opening switch and the second isolating switch is the closing switch.

[0116] S220. Calculate the three-phase current of the reverse bus interval according to the reverse bus interval information.

[0117] Among them, the inverse bus interval information includes the inverse bus three-phase current value, the inverse bus active power and the inverse bus reactive power. The three-phase current of the inverse bus interval is a vector. Since the phase of each phase of the inverse bus three-phase current cannot be detected, the phase angle of the three-phase current of the inverse bus interval can be calculated using the inverse bus active power and the inverse bus reactive power of the inverse bus interval, and the phase of the inverse bus A phase current relative to the A phase bus voltage is calculated using the A phase bus voltage as a reference. The phase of the inverse bus B phase and C phase current can be obtained by calculating the phase of the A phase current of the inverse bus interval. Then, the three-phase current of the inverse bus interval is calculated by the inverse bus three-phase current value and the inverse bus three-phase current phase.

[0118] S230. If the first isolating switch is a closing switch and the second isolating switch is an opening switch, the first three-phase current is the reverse bus interval three-phase current, and the second three-phase current is 0.

[0119] S240. If the first isolating switch is an opening switch and the second isolating switch is a closing switch, the first three-phase current is 0, and the second three-phase current is the reverse bus interval three-phase current.

[0120] Based on the above embodiment, optionally, Figure 3 A flowchart of the steps for calculating the three-phase current of the reverse bus interval provided by an embodiment of the present invention. Figure 3 As shown in the figure, the steps for calculating the three-phase current of the reverse bus bay are explained:

[0121] S310. Determine the reverse bus A phase of the reverse bus interval A phase current relative to the A phase bus voltage according to the reverse bus active power and the reverse bus reactive power.

[0122] Specifically, the inverted mother A phase Among them, Q1 is the reverse mother reactive power, and P1 is the reverse mother active power.

[0123] S320. Determine the phases of the inverted mother phase B and the inverted mother phase C according to the phase of the inverted mother phase A.

[0124] Among them, the phase difference between the inverted mother B phase and the inverted mother A phase is 120°, and the phase difference between the inverted mother C phase and the inverted mother A phase is 120°. Inverted mother C phase

[0125] S330. Calculate the inverted bus interval three-phase current according to the inverted bus three-phase current value, the inverted bus A phase, the inverted bus B phase and the inverted bus C phase.

[0126] Among them, the reverse bus three-phase current value includes the reverse bus A phase current value, the reverse bus B phase current value and the reverse bus C phase current value; the reverse bus interval three-phase current includes the reverse bus interval A phase current, the reverse bus interval B phase current and the reverse bus interval C phase current;

[0127] Therefore, the inverted bus interval A phase current can be determined according to the inverted bus A phase current value and the inverted bus A phase phase; the inverted bus interval B phase current can be determined according to the inverted bus B phase current value and the inverted bus B phase phase; the inverted bus interval C phase current can be determined according to the inverted bus C phase current value and the inverted bus C phase phase.

[0128] Based on the above embodiment, optionally, after determining the first power conversion information before the hot bus reverse operation and before determining the second power conversion information during the hot bus reverse operation, the method further includes:

[0129] According to the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch, the isolating switch to be operated by hot bus reversal is determined.

[0130] Among them, before the hot bus reversal operation, only one isolating switch is connected to the bus, and the closing and opening states of the first isolating switch and the second isolating switch can be determined before the hot bus reversal operation. During the hot bus reversal operation, the isolating switches on the bus side of the bus tie interval are all in the closed state, so it can be determined that the opening switch before the hot bus reversal operation is the hot bus reversal operation isolating switch.

[0131] Control the thermal busbar operation to close the disconnector.

[0132] Among them, during the hot bus reversal operation, the disconnectors on the bus side of the bus tie interval need to be in a closed state, which can be achieved by controlling the hot bus reversal operation disconnectors to close.

[0133] Based on the above embodiment, optionally, Figure 4 A flow chart of the steps of determining the third three-phase current of the first isolating switch and the fourth three-phase current of the second isolating switch provided in an embodiment of the present invention. Figure 4 As shown, the steps of determining the third three-phase current of the first isolating switch and the fourth three-phase current of the second isolating switch are described:

[0134] S410. Calculate the three-phase current of the bus-tie interval according to the second bus-tie interval information.

[0135] Among them, the second bus-tie interval information includes the second bus-tie three-phase current value, bus-tie active power and bus-tie reactive power. The three-phase current of the bus-tie interval is a vector. Since the phase of each phase of the three-phase current of the bus-tie circuit breaker of the bus-tie interval cannot be detected, the bus-tie active power and bus-tie reactive power of the bus-tie interval can be used to calculate the phase angle of the three-phase current of the bus-tie circuit breaker, and use the A-phase bus voltage as a reference to calculate the phase of the bus-tie A-phase current relative to the A-phase bus voltage - the bus-tie A-phase phase. The phases of the bus-tie B-phase and bus-tie C-phase currents can be obtained through the bus-tie A-phase phase. Therefore, the three-phase current of the bus-tie interval can be calculated through the second bus-tie three-phase current values, the bus-tie A-phase phase, the bus-tie B-phase phase and the bus-tie C-phase phase.

[0136] S420. Calculate the three-phase current of each outgoing line interval according to the outgoing line interval information of each outgoing line interval.

[0137] Among them, the outgoing line interval information of each outgoing line interval includes the outgoing line three-phase current value, the outgoing line active power and the outgoing line reactive power. The outgoing line interval three-phase current is a vector. Since the phase of each phase of the three-phase current of the outgoing line interval cannot be detected, the outgoing line active power and the outgoing line reactive power of each outgoing line interval can be used to calculate the phase angle of the three-phase current of each outgoing line interval, and the phase of the outgoing line A phase current relative to the A phase bus voltage is calculated with the A phase bus voltage as a reference to obtain the outgoing line A phase phase. The phase of the outgoing line B phase and C phase current can be obtained according to the outgoing line A phase phase. Therefore, the outgoing line interval three-phase current can be calculated by the outgoing line three-phase current value, the outgoing line A phase phase, the outgoing line B phase phase and the outgoing line C phase phase.

[0138] S430. Determine the first three-phase total current of all outgoing line intervals connected to the first bus and the second three-phase total current of all outgoing line intervals connected to the second bus according to the connection relationship between each outgoing line interval and the first bus and the second bus and the outgoing line interval three-phase current of each outgoing line interval.

[0139] Among them, the first three-phase total current refers to the sum of the vector three-phase currents of all outgoing line intervals connected to the first bus; the second three-phase total current refers to the sum of the vector three-phase currents of all outgoing line intervals connected to the second bus;.

[0140] S440. Calculate a third three-phase current and a fourth three-phase current according to the first three-phase total current, the second three-phase total current and the bus-tie interval three-phase current.

[0141] Among them, based on the characteristic that the input current and output current of each bus are equal, the third three-phase current of the first isolating switch and the fourth three-phase current of the second isolating switch can be calculated according to the first three-phase total current, the second three-phase total current and the three-phase current of the bus interval.

[0142] Specifically: the third three-phase current I 3 for:

[0143]

[0144] Where N1 is the total number of all outgoing line bays connected to the first busbar, i is the order of the outgoing line bays connected to the first busbar, and I i is the three-phase current of the outgoing line interval of the ith outgoing line interval (i is a positive integer). The direction of the three-phase current flowing out of the first busbar or the second busbar is the positive direction. M The three-phase current of the bus-coupler interval is in the positive direction, and the direction of the three-phase current of the bus-coupler interval from the first bus to the second bus is the positive direction;

[0145] Fourth three-phase current I 4 for:

[0146]

[0147] Wherein, N2 is the total number of all outgoing line bays connected to the second busbar, j is the order of the outgoing line bays connected to the second busbar, and I j is the three-phase current of the j-th outgoing line interval (j is a positive integer).

[0148] Based on the above embodiment, optionally, Figure 5 A flow chart of the steps of calculating the three-phase current of a bus-coupler interval provided by an embodiment of the present invention. Figure 5 As shown in the figure, the steps for calculating the three-phase current of the busbar interval are explained:

[0149] S510. Determine the bus-coupled A-phase phase of the bus-coupled A-phase current relative to the A-phase bus voltage according to the bus-coupled active power and the bus-coupled reactive power.

[0150] Specifically, the phase of busbar A Among them, Q2 is the bus tie reactive power, and P2 is the bus tie active power.

[0151] S520. Determine the phases of the bus tie B phase and the bus tie C phase according to the phase of the bus tie A phase.

[0152] The phase difference between bus link B phase and bus link A phase is 120°, and the phase difference between bus link C phase and bus link A phase is 120°. Inverted mother C phase

[0153] S530. Calculate the bus-couple interval three-phase current according to the second bus-couple three-phase current value, the bus-couple A phase, the bus-couple B phase, and the bus-couple C phase.

[0154] Among them, the second bus-couple three-phase current value includes the second bus-couple A phase current value, the second bus-couple B phase current value and the second bus-couple C phase current value; the bus-couple interval three-phase current includes the bus-couple interval A phase current, the bus-couple interval B phase current and the bus-couple interval C phase current;

[0155] Therefore, the A-phase current of the bus-link interval can be determined according to the second bus-link A-phase current value and the A-phase phase of the bus-link; the B-phase current of the bus-link interval can be determined according to the second bus-link B-phase current value and the A-phase phase of the bus-link; and the C-phase current of the bus-link interval can be determined according to the second bus-link C-phase current value and the C-phase phase of the bus-link.

[0156] Based on the above embodiment, optionally, Figure 6 A flow chart of the steps of calculating the three-phase current of each outgoing line interval provided by an embodiment of the present invention. Figure 6 As shown in the figure, the steps for calculating the three-phase current of each outgoing line interval are explained:

[0157] S610. Determine the outgoing line A phase of the A phase current of each outgoing line interval relative to the A phase bus voltage according to the outgoing line active power and the outgoing line reactive power of each outgoing line interval.

[0158] Specifically, the phase of the A phase of each outgoing line interval Among them, Q3 is the outgoing reactive power, and P3 is the outgoing active power.

[0159] S620 , determining the phases of the outgoing line B phase and the outgoing line C phase of each outgoing line interval according to the phase of the outgoing line A phase of each outgoing line interval.

[0160] Among them, the phase difference between the phase of the outgoing line B and the phase of the outgoing line A is 120°, and the phase difference between the phase of the outgoing line C and the phase of the outgoing line A is 120°. Phase of outgoing line C

[0161] S630, calculating the three-phase current of each outgoing line interval according to the outgoing line three-phase current value of each outgoing line interval, the phase of the outgoing line A phase, the phase of the outgoing line B phase and the phase of the outgoing line C phase.

[0162] Among them, the outgoing three-phase current value includes the outgoing A phase current value, the outgoing B phase current value and the outgoing C phase current value; the outgoing interval three-phase current includes the outgoing interval A phase current, the outgoing interval B phase current and the outgoing interval C phase current.

[0163] Therefore, the outgoing line interval A phase current can be determined according to the outgoing line A phase current value and the outgoing line A phase phase; the outgoing line interval B phase current can be determined according to the outgoing line B phase current value and the outgoing line B phase phase; the outgoing line interval C phase current can be determined according to the outgoing line C phase current value and the outgoing line C phase phase.

[0164] In addition, the third three-phase current includes a third A-phase current, a third B-phase current, and a third C-phase current.

[0165] Specifically, the third A phase current I 3A for:

[0166]

[0167] Where N1 is the total number of all outgoing line bays connected to the first busbar, i is the order of the outgoing line bays connected to the first busbar, and I iA is the phase A current of the i-th outgoing line interval (i is a positive integer), I MA It is the phase A current of the busbar interval.

[0168] Specifically, the third B phase current I 3B for:

[0169]

[0170] Where N1 is the total number of all outgoing line bays connected to the first busbar, i is the order of the outgoing line bays connected to the first busbar, and I iB is the phase B current of the i-th outgoing line interval (i is a positive integer), I MB It is the B phase current of the busbar interval.

[0171] Specifically, the third C phase current I 3C for:

[0172]

[0173] Where N1 is the total number of all outgoing line bays connected to the first busbar, i is the order of the outgoing line bays connected to the first busbar, and I iC is the phase C current of the i-th outgoing line interval (i is a positive integer), I MC It is the C phase current of the busbar interval.

[0174] In addition, the fourth three-phase current includes a fourth A-phase current, a fourth B-phase current, and a fourth C-phase current.

[0175] Specifically, the fourth A phase current I 4A for:

[0176]

[0177] Wherein, N2 is the total number of all outgoing line bays connected to the second busbar, j is the order of the outgoing line bays connected to the second busbar, and I jA is the phase A current of the jth outgoing line interval (j is a positive integer), I MA It is the phase A current of the busbar interval.

[0178] Specifically, the fourth B phase current I 4B for:

[0179]

[0180] Wherein, N2 is the total number of all outgoing line bays connected to the second busbar, j is the order of the outgoing line bays connected to the second busbar, and I jB is the phase B current of the jth outgoing line interval (j is a positive integer), I MB It is the B phase current of the busbar interval.

[0181] Specifically, the fourth C phase current I 4C for:

[0182]

[0183] Wherein, N2 is the total number of all outgoing line bays connected to the second busbar, j is the order of the outgoing line bays connected to the second busbar, and I jC is the phase C current of the jth outgoing line interval (j is a positive integer), I MC It is the C phase current of the busbar interval.

[0184] Based on the above embodiment, optionally, Figure 7 A flow chart of the steps of determining the closing position of a disconnect switch for a hot busbar operation provided by an embodiment of the present invention. Figure 7 As shown in the figure, the steps for determining the closing position of the disconnector for hot busbar reversal operation are described:

[0185] S710. Determine a bus-tie three-phase current change rate according to the first bus-tie interval information and the second bus-tie interval information.

[0186] The first bus coupling interval information includes the first bus coupling three-phase current value, and the first bus coupling three-phase current value includes the first bus coupling A phase current value, the first bus coupling B phase current value and the first bus coupling C phase current value;

[0187] The second bus-couple interval information includes the second bus-couple three-phase current value, and the second bus-couple three-phase current value includes the second bus-couple A phase current value, the second bus-couple B phase current value and the second bus-couple C phase current value;

[0188] The bus three-phase current change rate includes the bus A phase current change rate, the bus B phase current change rate and the bus C phase current change rate.

[0189] The steps for determining the bus-connecting three-phase current change rate include:

[0190] The bus-couple A-phase current change rate is calculated based on the first bus-couple A-phase current value and the second bus-couple A-phase current value.

[0191] Specifically, the bus-couple A-phase current change rate = (second bus-couple A-phase current value - first bus-couple A-phase current value) / first bus-couple A-phase current value.

[0192] The bus-couple B-phase current change rate is calculated according to the first bus-couple B-phase current value and the second bus-couple B-phase current value.

[0193] Specifically, the bus-couple B-phase current change rate=(second bus-couple B-phase current value−first bus-couple B-phase current value) / first bus-couple B-phase current value.

[0194] The bus-couple C-phase current change rate is calculated according to the first bus-couple C-phase current value and the second bus-couple C-phase current value.

[0195] Specifically, the bus-couple C-phase current change rate=(second bus-couple C-phase current value-first bus-couple C-phase current value) / first bus-couple C-phase current value.

[0196] S720. Determine a closing switch according to the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch.

[0197] If the opening and closing state of the first isolating switch is closed, the first isolating switch is a closing switch; if the opening and closing state of the second isolating switch is closed, the second isolating switch is a closing switch.

[0198] S730: If the first isolating switch is a closing switch, determine the first three-phase current change rate according to the first three-phase current and the third three-phase current.

[0199] The first three-phase current includes a first A-phase current, a first B-phase current and a first C-phase current. The third three-phase current includes a third A-phase current, a third B-phase current and a third C-phase current. The first three-phase current change rate includes a first A-phase current change rate, a first B-phase current change rate and a first C-phase current change rate.

[0200] The step of determining the first three-phase current change rate comprises:

[0201] The first A phase current change rate is calculated based on the first A phase current and the third A phase current.

[0202] Specifically, the first A-phase current change rate=(third A-phase current−first A-phase current) / first A-phase current.

[0203] The first B-phase current change rate is calculated based on the first B-phase current and the third B-phase current.

[0204] Specifically, the first B-phase current change rate=(third B-phase current−first B-phase current) / first B-phase current.

[0205] The first C-phase current change rate is calculated based on the first C-phase current and the third C-phase current.

[0206] Specifically, the first C-phase current change rate=(third C-phase current−first C-phase current) / first C-phase current.

[0207] S740: If the second isolating switch is a closing switch, determine the second three-phase current change rate according to the second three-phase current and the fourth three-phase current.

[0208] Among them, the second three-phase current includes the second A phase current, the second B phase current and the second C phase current; the fourth three-phase current includes the fourth A phase current, the fourth B phase current and the fourth C phase current; the second three-phase current change rate includes the second A phase current change rate, the second B phase current change rate and the second C phase current change rate.

[0209] The step of determining the second three-phase current change rate comprises:

[0210] The second A phase current change rate is calculated based on the second A phase current and the fourth A phase current.

[0211] Specifically, the second A-phase current change rate=(fourth A-phase current−second A-phase current) / second A-phase current.

[0212] The second B-phase current change rate is calculated based on the second B-phase current and the fourth B-phase current.

[0213] Specifically, the second B-phase current change rate=(fourth B-phase current−second B-phase current) / second B-phase current.

[0214] The second C-phase current change rate is calculated based on the second C-phase current and the fourth C-phase current.

[0215] Specifically, the second C-phase current change rate=(fourth C-phase current−second C-phase current) / second C-phase current.

[0216] S750. Determine the degree of imbalance of the three-phase current of the bus tie according to the second bus tie interval information.

[0217] Among them, the second bus-couple interval information includes the second bus-couple three-phase current value, and the second bus-couple three-phase current value includes the second bus-couple A phase current value, the second bus-couple B phase current value and the second bus-couple C phase current value.

[0218] The steps to measure the unbalance degree of the busbar three-phase current include:

[0219] Determine the maximum bus-couple phase current value and the minimum bus-couple phase current value of the second bus-couple A phase current value, the second bus-couple B phase current value, and the second bus-couple C phase current value.

[0220] The bus three-phase current imbalance is calculated based on the maximum bus phase current value and the minimum bus phase current value. Specifically, the bus three-phase current imbalance

[0221] Among them, P A is the current value of the second busbar A phase, P B is the current value of the second busbar B phase and P C is the current value of phase C of the second busbar.

[0222] S760: Determine the unbalance degree of the first three-phase current according to the third three-phase current.

[0223] The first step of determining the unbalance degree of three-phase current includes:

[0224] A first maximum phase current value and a first minimum phase current value of the third A-phase current, the third B-phase current, and the third C-phase current are determined.

[0225] A first three-phase current imbalance degree is calculated according to the first maximum phase current value and the first minimum phase current value.

[0226] Specifically, the first three-phase current unbalance degree

[0227] Among them, X A is the third phase A current, X B is the third phase B current, X C is the third phase C current, max(X A , X B , X C ) is the first maximum phase current value, min(X A , X B , X C ) is the first minimum phase current value.

[0228] S770. Determine the second three-phase current imbalance according to the fourth three-phase current.

[0229] The second step of determining the unbalance degree of the three-phase current includes:

[0230] Determine a second maximum phase current value and a second minimum phase current value of the fourth A phase current, the fourth B phase current, and the fourth C phase current;

[0231] A second three-phase current imbalance degree is calculated according to the second maximum phase current value and the second minimum phase current value.

[0232] Specifically, the second three-phase current unbalance degree

[0233] Among them, Y A is the fourth phase A current, Y B is the fourth B phase current, Y C is the fourth C phase current, max(Y A , Y B , Y C ) is the second maximum phase current value, min(Y A , Y B , Y C ) is the second minimum phase current value.

[0234] S780. If the first isolating switch is a closing switch, the closing position of the hot-reversing busbar operating isolating switch is determined based on the busbar three-phase current change rate, the first three-phase current change rate, the busbar three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance.

[0235] Specifically, if the bus three-phase current change rate or the first three-phase current change rate is less than the preset current change rate threshold, and any one of the bus three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance is greater than the preset imbalance threshold, the hot-bus operation isolating switch is not closed; otherwise, the hot-bus operation isolating switch is closed.

[0236] Exemplarily, if the preset current change rate threshold is 25%, and the preset imbalance threshold is 85%; when the bus three-phase current change rate or the first three-phase current change rate is less than 25%, and any one of the bus three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance is greater than 85%, the hot-bus operation isolating switch is not closed in place; otherwise, the hot-bus operation isolating switch is closed in place.

[0237] S790. If the second isolating switch is a closing switch, the closing position of the hot-reversing busbar operating isolating switch is determined based on the busbar three-phase current change rate, the second three-phase current change rate, the busbar three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance.

[0238] Specifically, if the bus three-phase current change rate or the second three-phase current change rate is less than the preset current change rate threshold, and any one of the bus three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance is greater than the preset imbalance threshold, the hot-bus operation isolating switch is not closed; otherwise, the hot-bus operation isolating switch is closed.

[0239] Exemplarily, if the preset current change rate threshold is 25%, and the preset imbalance threshold is 85%; when the bus three-phase current change rate or the second three-phase current change rate is less than 25%, and any one of the bus three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance is greater than 85%, the hot-bus operation isolating switch is not closed in place; otherwise, the hot-bus operation isolating switch is closed in place.

[0240] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0241] The above specific implementations do not constitute a limitation on the protection scope of the present invention. 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 modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for judging the closing position of a disconnector for hot busbar reversal operation, characterized in that: include: According to the busbar topology diagram of the substation to be detected, the first substation information before the hot busbar reversal operation and the second substation information during the hot busbar reversal operation are determined; wherein the first substation information includes the busbar reversal interval information, the first busbar coupling interval information, the opening and closing status of the first disconnector, and the opening and closing status of the second disconnector; the second substation information includes the outgoing line interval information of each outgoing line interval, the second busbar coupling interval information, and the connection relationship between each outgoing line interval and the first busbar and the second busbar; Determine a first three-phase current of the first isolating switch and a second three-phase current of the second isolating switch according to the inverted bus interval information, the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch; Determine the third three-phase current of the first disconnector and the fourth three-phase current of the second disconnector according to the outgoing line interval information of each outgoing line interval, the second bus-tie interval information, and the connection relationship between each outgoing line interval and the first bus and the second bus; The closing position of the hot-reversed busbar operation disconnect switch is determined based on the first busbar interval information, the second busbar interval information, the first three-phase current, the second three-phase current, the third three-phase current and the fourth three-phase current.

2. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 1 is characterized in that: The step of determining the first three-phase current of the first isolating switch and the second three-phase current of the second isolating switch comprises: Determine the closing switch and the opening switch according to the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch; Calculating the three-phase current of the inverted bus interval according to the inverted bus interval information; If the first isolating switch is a closing switch and the second isolating switch is an opening switch, the first three-phase current is the three-phase current of the reverse bus interval, and the second three-phase current is 0; If the first isolating switch is an opening switch and the second isolating switch is a closing switch, the first three-phase current is 0, and the second three-phase current is the three-phase current of the inverted busbar.

3. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 2 is characterized in that: The reverse bus interval information includes reverse bus three-phase current value, reverse bus active power and reverse bus reactive power; The step of calculating the three-phase current of the inverted bus interval includes: Determine the inverted bus phase A of the inverted bus interval phase A current relative to the A phase bus voltage according to the inverted bus active power and the inverted bus reactive power; According to the phase of the inverted mother phase A, determining the phase of the inverted mother phase B and the phase of the inverted mother phase C; The inverted bus interval three-phase current is calculated according to the inverted bus three-phase current value, the inverted bus A phase, the inverted bus B phase and the inverted bus C phase.

4. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 1 is characterized in that: After determining the first power transformation information before the hot bus reverse operation, and before determining the second power transformation information during the hot bus reverse operation, the method further includes: Determining the hot busbar reversing operation isolating switch according to the opening and closing states of the first isolating switch and the opening and closing states of the second isolating switch; Control the thermal busbar operation disconnecting switch to close.

5. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 1 is characterized in that: The step of determining a third three-phase current of the first isolating switch and a fourth three-phase current of the second isolating switch comprises: Calculating the three-phase current of the bus-coupler interval according to the second bus-coupler interval information; Calculating the three-phase current of each outgoing line interval according to the outgoing line interval information of each outgoing line interval; Determine a first three-phase total current of all the outgoing line intervals connected to the first busbar and a second three-phase total current of all the outgoing line intervals connected to the second busbar according to the connection relationship between each outgoing line interval and the first busbar and the second busbar and the outgoing line interval three-phase current of each outgoing line interval; The third three-phase current and the fourth three-phase current are calculated according to the first three-phase total current, the second three-phase total current and the bus-tie interval three-phase current.

6. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 5 is characterized in that: The second bus-coupler interval information includes the second bus-coupler three-phase current value, bus-coupler active power and bus-coupler reactive power; The step of calculating the three-phase current of the bus-tie interval comprises: Determine the bus coupling A phase of the bus coupling interval A phase current relative to the A phase bus voltage according to the bus coupling active power and the bus coupling reactive power; According to the phase of the bus coupling phase A, determine the phase of the bus coupling phase B and the phase of the bus coupling phase C; Calculate the bus-couple interval three-phase current according to the second bus-couple three-phase current value, the bus-couple A phase, the bus-couple B phase and the bus-couple C phase; The outgoing line interval information includes the outgoing line three-phase current value, the outgoing line active power and the outgoing line reactive power; The step of calculating the three-phase current of each outgoing line interval comprises: Determine the outgoing line A phase of the A phase current of each outgoing line interval relative to the A phase bus voltage according to the outgoing line active power and the outgoing line reactive power of each outgoing line interval; According to the phase of the outgoing line A phase of each of the outgoing line intervals, determining the phase of the outgoing line B phase and the phase of the outgoing line C phase of each of the outgoing line intervals; The three-phase current of each of the outgoing line intervals is calculated according to the outgoing line three-phase current value of each of the outgoing line intervals, the outgoing line A phase, the outgoing line B phase phase, and the outgoing line C phase phase.

7. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 5 is characterized in that: The third three-phase current I3 is: Wherein, N1 is the total number of all the outgoing line intervals connected to the first busbar, i is the order of the outgoing line intervals connected to the first busbar, and I i is the three-phase current of the outgoing line interval of the i-th outgoing line interval (i is a positive integer), and the direction of the three-phase current of the outgoing line interval flowing out of the first busbar or the second busbar is the positive direction, I M is the three-phase current of the bus-coupler interval, and the direction in which the three-phase current of the bus-coupler interval flows from the first bus to the second bus is the positive direction; The fourth three-phase current I4 is: Wherein, N2 is the total number of all the outgoing line intervals connected to the second busbar, j is the order of the outgoing line intervals connected to the second busbar, and I j is the three-phase current of the j-th outgoing line interval (j is a positive integer).

8. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 1 is characterized in that: The step of determining the closing position of the disconnect switch for thermal busbar operation comprises: Determine a bus-tie three-phase current change rate according to the first bus-tie interval information and the second bus-tie interval information; Determine the closing switch according to the opening and closing state of the first isolating switch and the opening and closing state of the second isolating switch; If the first isolating switch is a closing switch, determining a first three-phase current change rate according to the first three-phase current and the third three-phase current; If the second isolating switch is a closing switch, determining a second three-phase current change rate according to the second three-phase current and the fourth three-phase current; Determining the unbalance degree of the bus-couple three-phase current according to the second bus-couple interval information; Determining the unbalance degree of the first three-phase current according to the third three-phase current; determining a second three-phase current imbalance degree according to the fourth three-phase current; If the first isolating switch is a closing switch, the closing position of the isolating switch for hot-bus operation is determined according to the bus tie three-phase current change rate, the first three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance; If the second isolating switch is a closing switch, the closing position of the hot-reversing busbar operating isolating switch is determined based on the busbar three-phase current change rate, the second three-phase current change rate, the busbar three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance.

9. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 8, characterized in that: The first bus-tie interval information includes the first bus-tie three-phase current value, and the first bus-tie three-phase current value includes the first bus-tie A phase current value, the first bus-tie B phase current value, and the first bus-tie C phase current value; The second bus coupling interval information includes the second bus coupling three-phase current value, and the second bus coupling three-phase current value includes the second bus coupling A phase current value, the second bus coupling B phase current value and the second bus coupling C phase current value; The first three-phase current includes a first A-phase current, a first B-phase current and a first C-phase current; The second three-phase current includes a second A-phase current, a second B-phase current and a second C-phase current; The third three-phase current includes a third A-phase current, a third B-phase current and a third C-phase current; The fourth three-phase current includes a fourth A-phase current, a fourth B-phase current and a fourth C-phase current; The bus-couple three-phase current change rate includes the bus-couple A phase current change rate, the bus-couple B phase current change rate and the bus-couple C phase current change rate; The first three-phase current change rate includes a first A-phase current change rate, a first B-phase current change rate, and a first C-phase current change rate; The second three-phase current change rate includes a second A-phase current change rate, a second B-phase current change rate, and a second C-phase current change rate; The step of determining the bus-tie three-phase current change rate comprises: Calculating the bus coupler A phase current change rate according to the first bus coupler A phase current value and the second bus coupler A phase current value; Calculating the bus coupling B phase current change rate according to the first bus coupling B phase current value and the second bus coupling B phase current value; Calculating the bus coupler C phase current change rate according to the first bus coupler C phase current value and the second bus coupler C phase current value; The step of determining the first three-phase current change rate comprises: Calculating a change rate of the first A-phase current according to the first A-phase current and the third A-phase current; Calculating a change rate of the first B-phase current according to the first B-phase current and the third B-phase current; Calculating a change rate of the first C-phase current according to the first C-phase current and the third C-phase current; The step of determining the second three-phase current change rate comprises: Calculating the second A-phase current change rate according to the second A-phase current and the fourth A-phase current; Calculating a change rate of the second B-phase current according to the second B-phase current and the fourth B-phase current; Calculating a change rate of the second C-phase current according to the second C-phase current and the fourth C-phase current; The step of measuring the unbalance degree of the busbar three-phase current comprises: Determine a maximum bus-couple phase current value and a minimum bus-couple phase current value of the second bus-couple A phase current value, the second bus-couple B phase current value, and the second bus-couple C phase current value; Calculating the bus coupling three-phase current imbalance according to the maximum bus coupling phase current value and the minimum bus coupling phase current value; The step of determining the first three-phase current imbalance degree comprises: Determine a first maximum phase current value and a first minimum phase current value of the third A-phase current, the third B-phase current, and the third C-phase current; Calculating the first three-phase current imbalance degree according to the first maximum phase current value and the first minimum phase current value; The step of determining the second three-phase current unbalance degree comprises: Determine a second maximum phase current value and a second minimum phase current value of the fourth A-phase current, the fourth B-phase current, and the fourth C-phase current; The second three-phase current imbalance degree is calculated according to the second maximum phase current value and the second minimum phase current value.

10. The method for judging the closing position of the disconnector for thermal busbar reversal operation according to claim 8, characterized in that: If the first isolating switch is a closing switch, judging the closing position of the isolating switch for hot bus operation according to the bus tie three-phase current change rate, the first three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance, including: If the busbar three-phase current change rate or the first three-phase current change rate is less than the preset current change rate threshold, and any one of the busbar three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance is greater than the preset imbalance threshold, then the hot busbar operation disconnecting switch is not closed in place; otherwise, the hot busbar operation disconnecting switch is closed in place; If the second isolating switch is a closing switch, judging the closing position of the isolating switch for hot bus operation according to the bus tie three-phase current change rate, the second three-phase current change rate, the bus tie three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance, including: If the busbar three-phase current change rate or the second three-phase current change rate is less than the preset current change rate threshold, and any one of the busbar three-phase current imbalance, the first three-phase current imbalance and the second three-phase current imbalance is greater than the preset imbalance threshold, then the thermal busbar operation isolating switch is not closed in place; otherwise, the thermal busbar operation isolating switch is closed in place.

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