A method and system for controlling distance protection of a new energy transmission line

Abstract

The present invention discloses an action control method and system for distance protection of a new energy transmission line, comprising: obtaining zero-sequence current on both sides of the line and single-phase current and single-phase voltage of each phase on both sides of the line, and calculating the phase-to-phase current and phase-to-phase voltage on either side; for either side, calculating the first power supply equivalent impedance according to the phase current and phase voltage, and calculating the second power supply equivalent impedance according to the phase-to-phase current and phase-to-phase voltage; for either side, calculating the first power supply internal potential according to the phase current, phase voltage and the first power supply equivalent impedance, and calculating the second power supply internal potential according to the phase current, phase voltage and the second power supply equivalent impedance; for any phase, determining the first power angle according to the phase voltage and the first power supply internal potential; for any two different phases, determining the second power angle according to the phase voltage and the second power supply internal potential; determining the power angle range for correct action of the distance protection; and controlling the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range.

Description

Technical Field

[0001] The present invention relates to the technical field of relay system protection, and more specifically, to an action control method and system for distance protection of a new energy transmission line. Background Art

[0002] In recent years, the scale of installed capacity and power generation of new energy in my country has grown rapidly. Large-scale new energy is collected and transmitted through AC lines. When an AC line fails, the short-circuit current provided by the new energy power source is affected by the control strategy. The short-circuit current characteristics are significantly different from those of conventional power sources, which will cause incorrect operation of the AC line distance protection.

[0003] At present, the influence of new energy power supply control strategy on fault electrical characteristics and distance protection after AC system fault focuses on the influence of transition resistance on distance protection. However, in addition to transition resistance, the system power angle on both sides of the line is also an important factor leading to incorrect operation of distance protection. At present, the mechanism of incorrect operation of distance protection caused by new energy power supply control strategy in the context of new power system has not been deeply analyzed from the perspective of system power angle. There is no method to control whether the distance protection is operated. Summary of the invention

[0004] The present invention provides an action control method and system for distance protection of a new energy transmission line, so as to solve the problem of how to control whether the distance protection is actuated.

[0005] In order to solve the above problem, according to one aspect of the present invention, a method for controlling the operation of distance protection of a new energy transmission line is provided, the method comprising:

[0006] Obtain the zero-sequence current on both sides of the line and the single-phase current and single-phase voltage of each phase on both sides of the line, and calculate the phase-to-phase current and phase-to-phase voltage of any two different phases on either side according to the different corresponding single-phase currents and single-phase voltages on either side;

[0007] For any side, the first power supply equivalent impedance corresponding to any one side is calculated according to the zero-sequence current of any one side and the phase current and phase voltage of any one phase on any one side, and the second power supply equivalent impedance corresponding to any two different phases on any one side is calculated according to the phase-to-phase current and phase-to-phase voltage of any two different phases on any one side;

[0008] For any side, according to any corresponding phase current, phase voltage and first power supply equivalent impedance on the side, the internal potential of any corresponding first power supply on the side is calculated, and according to any different two corresponding phase currents, phase voltages and second power supply equivalent impedance on the side, the internal potential of any different two corresponding second power supplies on the side is calculated;

[0009] For any phase, according to the corresponding phase voltage and the internal potential of the first power supply on both sides of the line, the first power angle of the equivalent power supply on both sides of the line is determined; for any two different phases, according to the corresponding phase-to-phase voltage and the internal potential of the second power supply on both sides of the line, the second power angle of the equivalent power supply on both sides of the line is determined;

[0010] Determine the power angle range for correct operation of distance protection;

[0011] Based on the first power angle, the second power angle and the power angle range, the distance protection of the new energy transmission line is controlled.

[0012] Preferably, for any phase, determining the first power angle of the equivalent power supply on both sides of any corresponding line according to the corresponding phase voltage on both sides of the line and the potential inside the first power supply comprises:

[0013]

[0014] in, for The first power angle of the equivalent power sources on both sides of the corresponding line; For line M side the angle between the corresponding phase voltage and the potential within the first power supply; For line N side the angle between the corresponding phase voltage and the potential within the first power supply; For line M side The corresponding phase voltage and N side The angle between the corresponding phase voltages;

[0015] Preferably, for any two different phases, determining the second power angle of the equivalent power supply on both sides of the line corresponding to any two different phases according to the phase-to-phase voltage of the two different phases and the internal potential of the second power supply on both sides of the line comprises:

[0016]

[0017] in, for The corresponding second power angle of the equivalent power sources on both sides of the line; For line M side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line N side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line M side The corresponding phase-to-phase voltage and N-side The angle between the corresponding phase voltages;

[0018] Preferably, the determining of the power angle range for the correct action of the distance protection includes:

[0019] According to the power angle range of 360°-β>δ′>-α distance protection correct action, δ′ is the power angle; α and β are the preset action criterion boundary thresholds.

[0020] Preferably, the controlling of the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range includes:

[0021] If both the first power angle and the second power angle are within the power angle range, the distance protection of the new energy transmission line is controlled to operate normally;

[0022] If the first power angle and / or the second power angle is not within the power angle range, the distance protection of the new energy transmission line is controlled to be locked.

[0023] According to another aspect of the present invention, an action control system for distance protection of a new energy transmission line is provided, the system comprising:

[0024] A current and voltage acquisition unit, used to acquire the zero-sequence current on both sides of the line and the single-phase current and single-phase voltage of each phase on both sides of the line, and calculate the phase-to-phase current and phase-to-phase voltage of any two different phases on either side according to the different corresponding single-phase currents and single-phase voltages on either side;

[0025] A power supply equivalent impedance calculation unit is used to calculate, for any side, a first power supply equivalent impedance corresponding to any one side according to the zero-sequence current of any one side and the phase current and phase voltage of any one phase on any one side, and calculate a second power supply equivalent impedance corresponding to any two different phases on any one side according to the phase-to-phase current and phase-to-phase voltage of any two different phases on any one side;

[0026] A power supply internal potential calculation unit, for calculating, for any side, a first power supply internal potential corresponding to any one side according to any corresponding phase current, phase voltage and first power supply equivalent impedance on the side, and calculating a second power supply internal potential corresponding to any two different pairs of the side according to the interphase current, interphase voltage and second power supply equivalent impedance corresponding to any two pairs of the side;

[0027] A power angle calculation unit is used to determine, for any phase, a first power angle of equivalent power supplies on both sides of the corresponding line according to the corresponding phase voltage on both sides of the line and the internal potential of the first power supply; and for any two different phases, determine a second power angle of equivalent power supplies on both sides of the corresponding line according to the corresponding phase-to-phase voltage on both sides of the line and the internal potential of the second power supply;

[0028] A power angle range determination unit is used to determine the power angle range for the correct action of the distance protection;

[0029] A control unit is used to control the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range.

[0030] Preferably, the power angle calculation unit determines, for any phase, a first power angle of equivalent power sources on both sides of any corresponding line according to the corresponding phase voltage on both sides of the line and the potential inside the first power source, including:

[0031]

[0032] in, for The first power angle of the equivalent power sources on both sides of the corresponding line; For line M side the angle between the corresponding phase voltage and the potential within the first power supply; For line N side the angle between the corresponding phase voltage and the potential within the first power supply; For line M side The corresponding phase voltage and N side The angle between the corresponding phase voltages;

[0033] Preferably, the power angle calculation unit determines, for any two different phases, the second power angle of the equivalent power sources on both sides of the line corresponding to any two different phases according to the phase-to-phase voltages of the two different phases and the internal potential of the second power source on both sides of the line, including:

[0034]

[0035] in, for The corresponding second power angle of the equivalent power sources on both sides of the line; For line M side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line N side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line M side The corresponding phase-to-phase voltage and N-side The angle between the corresponding phase voltages;

[0036] Preferably, the power angle range determining unit determines the power angle range for correct action of the distance protection, including:

[0037] According to the power angle range of 360°-β>δ′>-α distance protection correct action, δ′ is the power angle; α and β are the preset action criterion boundary thresholds.

[0038] Preferably, the control unit controls the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range, including:

[0039] If both the first power angle and the second power angle are within the power angle range, the distance protection of the new energy transmission line is controlled to operate normally;

[0040] If the first power angle and / or the second power angle is not within the power angle range, the distance protection of the new energy transmission line is controlled to be locked.

[0041] Based on another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any step of an action control method for distance protection of a new energy transmission line.

[0042] According to another aspect of the present invention, the present invention provides an electronic device, including:

[0043] The computer-readable storage medium described above; and

[0044] One or more processors are used to execute the program in the computer-readable storage medium.

[0045] The present invention provides an action control method and system for distance protection of a new energy transmission line, including: obtaining zero-sequence currents on both sides of the line and single-phase currents and single-phase voltages of each phase on both sides of the line, and calculating the phase-to-phase currents and phase-to-phase voltages of any two different phases on either side according to the different corresponding single-phase currents and single-phase voltages on either side; for any side, calculating the first power supply equivalent impedance of any corresponding one on either side according to the zero-sequence current on either side and the phase current and phase voltage of any phase on either side, and calculating the second power supply equivalent impedance of any two different phases on either side according to the phase-to-phase current and phase voltage of any two different phases on either side; for any side, calculating the phase current, phase voltage and first power supply equivalent impedance of any corresponding one on either side according to the phase current, phase voltage and first power supply equivalent impedance of any corresponding one on either side. The internal potential of the first power source corresponding to any one side is calculated according to the phase-to-phase current, phase-to-phase voltage and equivalent impedance of the second power source corresponding to any two different ones on the side; for any phase, the first power angle of the equivalent power source on both sides of the line is determined according to the phase voltage and the internal potential of the first power source corresponding to any one different two phases; for any different two phases, the second power angle of the equivalent power source on both sides of the line is determined according to the phase-to-phase voltage and the internal potential of the second power source corresponding to any two different ones on both sides of the line; the power angle range for the correct operation of the distance protection is determined; based on the first power angle, the second power angle and the power angle range, the distance protection of the new energy transmission line is controlled. The present invention performs calculations based on the current and voltage at the line outlet, determines the first power angle of equivalent power sources on both sides of the same corresponding line and the second power angle of equivalent power sources on both sides of the same but different corresponding lines, and controls the distance protection of the new energy transmission line based on the first power angle and the second power angle, so that when the power angles on both sides of the line are not within the power angle range, the distance protection is locked; when the power angles on both sides of the line are within the power angle range, the distance protection is opened, which can prevent the new energy power supply control strategy from causing the distance protection to operate incorrectly. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0047] Figure 1 (a) and (b) are schematic diagrams showing the relationship between the new energy impedance and internal potential before and after the fault.

[0048] Figure 2 A schematic diagram of a fault of an AC line for transmitting renewable energy according to an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of protection refusal to operate when a fault occurs in the forward zone according to an embodiment of the present invention;

[0050] Figure 4A schematic diagram illustrating an example of protection misoperation when a fault occurs outside the reverse zone according to an embodiment of the present invention;

[0051] Figure 5 It is a flow chart of an action control method 500 of distance protection of a new energy transmission line according to an embodiment of the present invention;

[0052] Figure 6 Schematic diagram of the structure of an action control system 600 for distance protection of a new energy transmission line according to an embodiment of the present invention. DETAILED DESCRIPTION

[0053] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0054] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0055] For the phase-comparison distance protection with positive sequence voltage as polarization voltage, the protection criteria are as follows:

[0056]

[0057] In the formula, is the compensation voltage, For phase distance relays For ground distance relays is the polarization voltage, which can reflect the working condition before the fault. α and β are the boundaries of the action criterion; is the zero sequence current.

[0058] After an AC line fault, the short-circuit current provided by the new energy source or flexible DC system is affected by the control strategy, the apparent power supply presents weak power supply characteristics, and the power supply impedance increases, causing and The power angle δ′ between the two increases. When 360°-β>δ′>-α, the distance protection will refuse to operate when there is a fault in the line area; the distance protection will malfunction when there is a reverse fault outside the area. The distance protection action boundary with positive sequence voltage as the polarization quantity is when the power angle δ′ on both sides of the line satisfies 360°-β>δ′>-α, or when the power angle on both sides of the line is 360°-β<δ′<360°-α and the back-side system impedance is small.

[0059] Before and after the fault, the relationship between the internal potential of the new energy source and the voltage and current at the protection installation is as follows: Figure 1 As shown in (a) and (b), it can be seen that the impedance amplitude increases after the new energy power supply fails, showing the characteristics of a weak power supply.

[0060] by Figure 2 Take the fault of the new energy transmission AC line as an example. When a BC phase short circuit fault occurs at point F1 of the AC line, the protection action of the phase-to-phase distance relay with positive sequence voltage polarization on the M side is as follows: Figure 3 As shown in the figure, the distance protection of the forward zone fault fails to operate. When a BC phase-to-phase short circuit fault occurs at point F2 of the AC line, the protection action of the phase-to-phase distance relay with positive sequence voltage polarization on the N side is shown in the figure below. Figure 4 As shown in the figure, the distance protection malfunctioned due to a reverse fault outside the zone.

[0061] Therefore, the present invention provides an action control method for distance protection of a new energy transmission line for phase-comparison distance protection with positive sequence voltage as polarization voltage.

[0062] Figure 5 FIG. 5 is a flow chart of an action control method 500 for distance protection of a new energy transmission line according to an embodiment of the present invention. Figure 5 As shown, the action control method of the distance protection of the new energy transmission line provided by the embodiment of the present invention is calculated based on the current and voltage of the line outlet, and the first power angle of the equivalent power supply on both sides of the same corresponding line and the second power angle of the equivalent power supply on both sides of the same different corresponding line are determined, and the distance protection of the new energy transmission line is controlled based on the first power angle and the second power angle, so that when the power angle on both sides of the line is not in the power angle range, the distance protection is locked; when the power angle on both sides of the line is in the power angle range, the distance protection is opened, which can prevent the new energy power supply control strategy from causing the distance protection to operate incorrectly. The action control method 500 of the distance protection of the new energy transmission line provided by the embodiment of the present invention starts from step 501, and in step 501, the zero-sequence current on both sides of the line and the single-phase current and single-phase voltage of each phase on both sides of the line are obtained, and the phase-to-phase current and phase-to-phase voltage of any two different phases on either side are calculated according to the different corresponding single-phase currents and single-phase voltages on either side.

[0063] In the present invention, it is first necessary to collect the zero-sequence current on both sides of the line and the single-phase current and single-phase voltage of the three phases A, B, and C on both sides of the line, and calculate the phase-to-phase current and phase-to-phase voltage based on the single-phase current and single-phase voltage, including the phase-to-phase current and phase-to-phase voltage between AB, BC, and CA.

[0064] In step 502, for any side, the first power supply equivalent impedance corresponding to any phase on any side is calculated based on the zero-sequence current on any side and the phase current and phase voltage of any phase on any side, and the second power supply equivalent impedance corresponding to any two different phases on any side is calculated based on the phase-to-phase current and phase-to-phase voltage of any two different phases on any side.

[0065] In the present invention, for either side, after obtaining the zero-sequence current and the phase currents and phase voltages of the three phases A, B, and C, firstly, according to the formula ( k=(Z 0 -Z 1 ) / 3Z 1 , Z 0 is the zero-sequence impedance per unit length of the line, Z 1 is the positive sequence impedance per unit length of the line) to calculate the corresponding Then according to the corresponding The first power supply equivalent impedance corresponding to A, B, and C is calculated respectively according to the phase voltage; for any side, after obtaining the phase current and phase voltage corresponding to AB, BC, and CA, the second power supply equivalent impedance corresponding to AB, BC, and CA phases is calculated respectively according to the phase current and phase voltage corresponding to AB, BC, and CA phases.

[0066] In step 503, for any side, the internal potential of any corresponding first power supply on any side is calculated based on any corresponding phase current, phase voltage and equivalent impedance of the first power supply on any side, and the internal potential of any different two corresponding second power supplies on any side is calculated based on any different two corresponding phase currents, phase voltages and equivalent impedance of the second power supply on any side.

[0067] In the present invention, for any side, after obtaining the first power supply equivalent impedances corresponding to the three phases A, B, and C, respectively, the first power supply internal potentials corresponding to the three phases A, B, and C are calculated according to the phase currents, phase voltages, and the first power supply equivalent impedances corresponding to the three phases A, B, and C. For any side, after obtaining the second power supply equivalent impedances corresponding to the AB, BC, and CA phases, the second power supply internal potentials corresponding to the AB, BC, and CA phases are calculated according to the phase currents, phase voltages, and the second power supply equivalent impedances corresponding to the AB, BC, and CA phases, respectively.

[0068] In step 504, for any phase, the first power angle of the equivalent power on both sides of the line is determined based on the corresponding phase voltage and the internal potential of the first power supply on both sides of the line; for any different two phases, the second power angle of the equivalent power on both sides of the line is determined based on the corresponding phase-to-phase voltage and the internal potential of the second power supply on both sides of the line.

[0069] Preferably, for any phase, determining the first power angle of the equivalent power supply on both sides of any corresponding line according to the corresponding phase voltage on both sides of the line and the potential inside the first power supply comprises:

[0070]

[0071] in, for The first power angle of the equivalent power sources on both sides of the corresponding line; For line M side the angle between the corresponding phase voltage and the potential within the first power supply; For line N side the angle between the corresponding phase voltage and the potential within the first power supply; For line M side The corresponding phase voltage and N side The angle between the corresponding phase voltages;

[0072] Preferably, for any two different phases, determining the second power angle of the equivalent power supply on both sides of the line corresponding to any two different phases according to the phase-to-phase voltage of the two different phases and the internal potential of the second power supply on both sides of the line comprises:

[0073]

[0074] in, for The corresponding second power angle of the equivalent power sources on both sides of the line; For line M side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line N side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line M side The corresponding phase-to-phase voltage and N-side The angle between the corresponding phase voltages;

[0075] In the present invention, after determining the internal potential of the power supply corresponding to each phase and the phases on both sides, based on the formula Calculate the power angle of the equivalent power supply on both sides of the line corresponding to the three phases A, B, and C respectively, based on the formula Calculate the power angles of equivalent power sources on both sides of the line corresponding to phases AB, BC and CA respectively.

[0076] In step 505, the power angle range for correct operation of the distance protection is determined.

[0077] Preferably, the determining of the power angle range for the correct action of the distance protection includes:

[0078] According to the power angle range of 360°-β>δ′>-α distance protection correct action, δ′ is the power angle; α and β are the preset action criterion boundary thresholds.

[0079] In step 506, based on the first power angle, the second power angle and the power angle range, the distance protection of the new energy transmission line is controlled.

[0080] Preferably, the controlling of the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range includes:

[0081] If both the first power angle and the second power angle are within the power angle range, the distance protection of the new energy transmission line is controlled to operate normally;

[0082] If the first power angle and / or the second power angle is not within the power angle range, the distance protection of the new energy transmission line is controlled to be locked.

[0083] In the present invention, the power angle range for correct operation of the distance protection is first determined according to 360°-β>δ′>-α; wherein δ′ is the power angle; α and β are preset action criterion boundary thresholds. When α and β are 90° and 270° respectively, the power angle range is 90°>δ′>-90°. α and β can also be set according to demand. Then determine whether the first power angle or the second power angle is within the power angle range. Among them, for the new energy side, if the first power angles corresponding to A, B, and C and the second power angles corresponding to AB, BC, and CA phases are all within the power angle range, the distance protection of the new energy transmission line is controlled to operate normally; conversely, if the first power angles corresponding to A, B, and C and / or the second power angles corresponding to AB, BC, and CA phases are not all within the power angle range, the distance protection of the new energy transmission line is controlled to be locked.

[0084] Figure 6 FIG. 6 is a schematic diagram of the structure of an action control system 600 for distance protection of a new energy transmission line according to an embodiment of the present invention. Figure 6As shown, the action control system 600 for distance protection of new energy transmission lines provided in an embodiment of the present invention includes: a current and voltage acquisition unit 601, a power source equivalent impedance calculation unit 602, a power source internal potential calculation unit 603, a power angle calculation unit 604, a power angle range determination unit 605 and a control unit 606.

[0085] Preferably, the current and voltage acquisition unit 601 is used to obtain the zero-sequence current on both sides of the line and the single-phase current and single-phase voltage of each phase on both sides of the line, and calculate the phase-to-phase current and phase-to-phase voltage of any two different phases on either side based on the different corresponding single-phase currents and single-phase voltages on either side.

[0086] Preferably, the power supply equivalent impedance calculation unit 602 is used to calculate, for any side, the first power supply equivalent impedance corresponding to any one side according to the zero-sequence current on any one side and the phase current and phase voltage of any phase on any one side, and to calculate the second power supply equivalent impedance corresponding to any two different phases on any one side according to the phase-to-phase current and phase-to-phase voltage of any two different phases on any one side.

[0087] Preferably, the power supply internal potential calculation unit 603 is used to calculate the internal potential of the first power supply corresponding to any side according to any corresponding phase current, phase voltage and first power supply equivalent impedance on any side, and calculate the internal potential of the second power supply corresponding to any different two sides on any side according to any corresponding phase-to-phase current, phase-to-phase voltage and second power supply equivalent impedance on any different two sides.

[0088] Preferably, the power angle calculation unit 604 is used to determine, for any phase, a first power angle of equivalent power sources on both sides of the line according to the corresponding phase voltage and the internal potential of the first power source on both sides of the line; and for any different two phases, determine, for any different two phases, a second power angle of equivalent power sources on both sides of the line according to the corresponding phase-to-phase voltage and the internal potential of the second power source on both sides of the line.

[0089] Preferably, the power angle calculation unit 604 determines, for any phase, a first power angle of equivalent power supplies on both sides of any corresponding line according to the corresponding phase voltage on both sides of the line and the potential inside the first power supply, including:

[0090]

[0091] in, for The first power angle of the equivalent power sources on both sides of the corresponding line; For line M side the angle between the corresponding phase voltage and the potential within the first power supply; For line N side the angle between the corresponding phase voltage and the potential within the first power supply; For line M side The corresponding phase voltage and N side The angle between the corresponding phase voltages;

[0092] Preferably, the power angle calculation unit 604 determines, for any two different phases, the second power angle of the equivalent power sources on both sides of the line corresponding to any two different phases according to the phase-to-phase voltages of the two different phases and the internal potential of the second power source on both sides of the line, including:

[0093]

[0094] in, for The corresponding second power angle of the equivalent power sources on both sides of the line; For line M side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line N side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line M side The corresponding phase-to-phase voltage and N-side The angle between the corresponding phase voltages;

[0095] Preferably, the power angle range determining unit 605 is used to determine the power angle range for correct operation of the distance protection.

[0096] Preferably, the power angle range determining unit 605 determines the power angle range for the correct action of the distance protection, including:

[0097] According to the power angle range of 360°-β>δ′>-α distance protection correct action, δ′ is the power angle; α and β are the preset action criterion boundary thresholds.

[0098] Preferably, the control unit 606 is used to control the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range.

[0099] Preferably, the control unit 606 controls the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range, including:

[0100] If both the first power angle and the second power angle are within the power angle range, the distance protection of the new energy transmission line is controlled to operate normally;

[0101] If the first power angle and / or the second power angle is not within the power angle range, the distance protection of the new energy transmission line is controlled to be locked.

[0102] The action control system 600 of the distance protection of the new energy transmission line in the embodiment of the present invention corresponds to the action control method 100 of the distance protection of the new energy transmission line in another embodiment of the present invention, which will not be described in detail here.

[0103] Based on another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any step of an action control method for distance protection of a new energy transmission line.

[0104] According to another aspect of the present invention, the present invention provides an electronic device, including:

[0105] The computer-readable storage medium described above; and

[0106] One or more processors are used to execute the program in the computer-readable storage medium.

[0107] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0108] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of the means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0109] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0110] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0111] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0112] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the distance protection of a new energy transmission line. It is characterized in that The method comprises: Obtain the zero-sequence current on both sides of the line and the single-phase current and single-phase voltage of each phase on both sides of the line, and calculate the phase-to-phase current and phase-to-phase voltage of any two different phases on either side according to the different corresponding single-phase currents and single-phase voltages on either side; For any side, the first power supply equivalent impedance corresponding to any one side is calculated according to the zero-sequence current of any one side and the phase current and phase voltage of any one phase on any one side, and the second power supply equivalent impedance corresponding to any two different phases on any one side is calculated according to the phase-to-phase current and phase-to-phase voltage of any two different phases on any one side; For any side, according to any corresponding phase current, phase voltage and first power supply equivalent impedance on the side, the internal potential of any corresponding first power supply on the side is calculated, and according to any different two corresponding phase currents, phase voltages and second power supply equivalent impedance on the side, the internal potential of any different two corresponding second power supplies on the side is calculated; For any phase, according to the corresponding phase voltage and the internal potential of the first power supply on both sides of the line, the first power angle of the equivalent power supply on both sides of the line is determined; for any two different phases, according to the corresponding phase-to-phase voltage and the internal potential of the second power supply on both sides of the line, the second power angle of the equivalent power supply on both sides of the line is determined; Determine the power angle range for correct operation of distance protection; Based on the first power angle, the second power angle and the power angle range, the distance protection of the new energy transmission line is controlled; Wherein, for any phase, determining the first power angle of the equivalent power supply on both sides of any corresponding line according to the phase voltage of any corresponding phase on both sides of the line and the potential inside the first power supply comprises: in, for The first power angle of the equivalent power sources on both sides of the corresponding line; For line M side the angle between the corresponding phase voltage and the potential within the first power supply; For line N side the angle between the corresponding phase voltage and the potential within the first power supply; For line M side The corresponding phase voltage and N side The angle between the corresponding phase voltages; B or C, indicating phase A, phase B or phase C; The controlling of the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range includes: If both the first power angle and the second power angle are within the power angle range, the distance protection of the new energy transmission line is controlled to operate normally; If the first power angle and / or the second power angle is not within the power angle range, the distance protection of the new energy transmission line is controlled to be locked.

2. The method according to claim 1, It is characterized in that The step of determining the second power angle of the equivalent power supply on both sides of the line corresponding to any two different phases according to the phase-to-phase voltage of the two different phases on both sides of the line and the internal potential of the second power supply comprises: in, for The corresponding second power angle of the equivalent power sources on both sides of the line; For line M side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line N side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line M side The corresponding phase-to-phase voltage and N-side The angle between the corresponding phase voltages; =AB, BC or CA.

3. The method according to claim 1, It is characterized in that The power angle range for determining the correct action of the distance protection includes: According to the power angle range of 360°-β>δ′>-α distance protection correct action, δ′ is the power angle; α and β are the preset action criterion boundary thresholds.

4. An action control system for distance protection of new energy transmission lines, It is characterized in that The system comprises: A current and voltage acquisition unit, used to acquire the zero-sequence current on both sides of the line and the single-phase current and single-phase voltage of each phase on both sides of the line, and calculate the phase-to-phase current and phase-to-phase voltage of any two different phases on either side according to the different corresponding single-phase currents and single-phase voltages on either side; A power supply equivalent impedance calculation unit is used to calculate, for any side, a first power supply equivalent impedance corresponding to any one side according to the zero-sequence current of any one side and the phase current and phase voltage of any one phase on any one side, and calculate a second power supply equivalent impedance corresponding to any two different phases on any one side according to the phase-to-phase current and phase-to-phase voltage of any two different phases on any one side; A power supply internal potential calculation unit, for calculating, for any side, a first power supply internal potential corresponding to any one side according to any corresponding phase current, phase voltage and first power supply equivalent impedance on the side, and calculating a second power supply internal potential corresponding to any two different pairs of the side according to the interphase current, interphase voltage and second power supply equivalent impedance corresponding to any two pairs of the side; A power angle calculation unit is used to determine, for any phase, a first power angle of equivalent power supplies on both sides of the corresponding line according to the corresponding phase voltage on both sides of the line and the internal potential of the first power supply; and for any two different phases, determine a second power angle of equivalent power supplies on both sides of the corresponding line according to the corresponding phase-to-phase voltage on both sides of the line and the internal potential of the second power supply; A power angle range determination unit is used to determine the power angle range for the correct action of the distance protection; A control unit, configured to control the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range; The power angle calculation unit determines, for any phase, a first power angle of equivalent power supplies on both sides of any corresponding line according to the corresponding phase voltage on both sides of the line and the potential inside the first power supply, including: in, for The first power angle of the equivalent power sources on both sides of the corresponding line; For line M side the angle between the corresponding phase voltage and the potential within the first power supply; For line N side the angle between the corresponding phase voltage and the potential within the first power supply; For line M side The corresponding phase voltage and N side The angle between the corresponding phase voltages; B or C, indicating phase A, phase B or phase C; The control unit controls the distance protection of the new energy transmission line based on the first power angle, the second power angle and the power angle range, including: If both the first power angle and the second power angle are within the power angle range, the distance protection of the new energy transmission line is controlled to operate normally; If the first power angle and / or the second power angle is not within the power angle range, the distance protection of the new energy transmission line is controlled to be locked.

5. The system according to claim 4, It is characterized in that The power angle calculation unit determines, for any two different phases, the second power angle of the equivalent power supply on both sides of the line corresponding to any two different phases according to the phase-to-phase voltage of the two different phases and the internal potential of the second power supply on both sides of the line, including: in, for The corresponding second power angle of the equivalent power sources on both sides of the line; For line M side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line N side The angle between the corresponding phase-to-phase voltage and the potential in the second power supply; For line M side The corresponding phase-to-phase voltage and N-side The angle between the corresponding phase voltages; =AB, BC or CA.

6. The system according to claim 4, It is characterized in that The power angle range determination unit determines the power angle range for the correct action of the distance protection, including: According to the power angle range of 360°-β>δ′>-α distance protection correct action, δ′ is the power angle; α and β are the preset action criterion boundary thresholds.

7. A computer-readable storage medium having a computer program stored thereon, It is characterized in that When the program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.

8. An electronic device, It is characterized in that include: The computer readable storage medium as claimed in claim 7; and one or more processors for executing the program in the computer-readable storage medium.

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