Method, system and storage medium for overvoltage suppression of a new energy transmission system

Abstract

The application discloses a new energy sending-out system overvoltage suppression method and system and a storage medium. First, an electromagnetic transient simulation model is established according to the equipment parameters of the new energy sending-out system, and the overvoltage exceeding position of the new energy sending-out system is determined based on the model. Then, the parameters of the overvoltage suppression device are determined for the most serious overvoltage exceeding position. Secondly, when the suppression device is configured, simulation is carried out according to the installation effect of different positions, and the overvoltage exceeding position with the highest overvoltage level is installed. After the overvoltage level of the system is calculated through model simulation, if there is still an exceeding position, the overvoltage exceeding position with the highest overvoltage is installed in the remaining exceeding positions, and the process is repeated until all positions do not exceed. Finally, the overvoltage suppression scheme of the system is determined, and the overvoltage of the system is suppressed according to the overvoltage suppression scheme. The application can quickly respond to the transient and temporary overvoltage of the new energy sending-out system, ensure the safety of the equipment, and avoid the new energy off-grid.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of power system overvoltage and insulation coordination, and more particularly, relates to a new energy sending-out system overvoltage suppression method, system and storage medium. BACKGROUND

[0002] At present, renewable energy such as wind power, solar power and hydropower is vigorously developed, which has become a major demand for sustainable development of energy in China and even the world, and high proportion of renewable energy grid connection will become an inevitable development trend and an important feature of future Chinese power system. New energy power sources represented by wind power almost all adopt power electronic converters, and high-voltage direct current transmission has become an important means for large-scale sending-out of new energy. Large-scale access of new energy to power systems and application of a large number of power electronic devices make the overvoltage characteristics of power systems more complex, and high-amplitude and long-duration overvoltage may be generated during system failure or disturbance, which threatens the safety of equipment and may also cause wind turbine tripping and other chain problems. Overvoltage protection technology based on fixed arresters and reactive power compensation is difficult to adapt to the overvoltage suppression requirements under the background of large-scale access of new energy to power systems. SUMMARY

[0003] To solve the above technical problems, the application provides a new energy sending-out system overvoltage suppression method, which effectively limits the overvoltage level and avoids wind turbine tripping.

[0004] According to one aspect of the application, a new energy sending-out system overvoltage suppression method is provided, comprising:

[0005] Step 1: An electromagnetic transient simulation model is established according to the device parameters of the new energy sending-out system, and the overvoltage exceeding position of the new energy sending-out system is determined based on the electromagnetic transient simulation model;

[0006] Step 2: It is judged whether the new energy sending-out system has an overvoltage exceeding position;

[0007] Step 3: When the new energy sending-out system has an overvoltage exceeding position, the parameters of the overvoltage suppression device are determined for the most serious overvoltage exceeding position;

[0008] Step 4: The overvoltage suppression device is installed at the most serious overvoltage exceeding position according to the determined parameters, and then the overvoltage level of the new energy sending-out system is simulated and calculated by the electromagnetic transient simulation model;

[0009] Step 5: It is judged whether the current installation position of the overvoltage suppression device is overvoltage exceeding according to the overvoltage level;

[0010] Step 6: If the overvoltage of the current installation position exceeds the standard, adjust the parameters of the overvoltage suppression device, and then go to step 4; if the overvoltage of the current installation position does not exceed the standard, go to step 7;

[0011] Step 7: Determine whether the energy consumption of the overvoltage suppression device exceeds the standard; if the energy consumption of the overvoltage suppression device exceeds the standard, adjust the parameters of the overvoltage suppression device, and then go to step 4; if the energy consumption of the overvoltage suppression device does not exceed the standard, go to step 8;

[0012] Step 8: Determine whether the overvoltage of the remaining positions in the new energy sending-out system except the most serious overvoltage exceeding position exceeds the standard; if the overvoltage of the remaining positions exceeds the standard, go to step 3; if the overvoltage of the remaining positions does not exceed the standard, determine the overvoltage suppression scheme of the new energy sending-out system, and suppress the overvoltage of the new energy sending-out system according to the overvoltage suppression scheme.

[0013] Optionally, the overvoltage suppression device comprises a first metal oxide voltage limiter and a second metal oxide voltage limiter connected in series, the first metal oxide voltage limiter is connected with the live wire through a connecting switch, the second metal oxide voltage limiter is grounded, and the second metal oxide voltage limiter is connected in parallel with the mechanical switch and the power electronic switch.

[0014] Optionally, the action strategy of the overvoltage suppression device is:

[0015] Under normal operation of the new energy sending-out system, the mechanical switch and the power electronic switch are both in the open state, and the connecting switch is in the closed state;

[0016] When it is detected that the voltage of the new energy sending-out system is reduced for more than 20 ms, the power electronic switch and the mechanical switch are commanded to be closed; after the voltage of the new energy sending-out system is restored and lasts for 0.1 s, the mechanical switch and the power electronic switch are commanded to be opened to restore the normal state;

[0017] When it is detected that the voltage of the new energy sending-out system exceeds 1.3 p.u., the power electronic switch and the mechanical switch are commanded to be closed, and the opening command of the power electronic switch and the mechanical switch is sent after a delay of 100 ms;

[0018] The energy of the lightning arrester is continuously monitored and calculated, and when the energy of the lightning arrester exceeds the allowed value, the connecting switch is commanded to be opened to protect the body of the lightning arrester.

[0019] Optionally, in step 1, an electromagnetic transient simulation model is established according to the device parameters of the new energy sending-out system, and the overvoltage exceeding position of the new energy sending-out system is determined based on the electromagnetic transient simulation model, comprising:

[0020] According to the control characteristics of the new energy unit in the new energy sending-out system, the working characteristics of the key equipment, the simulation characteristics of the power transmission line, and the action characteristics of the relay protection and the circuit breaker, an electromagnetic transient simulation model is established; the key equipment includes a transformer, a reactor, and a lightning arrester;

[0021] On the basis of the established electromagnetic transient simulation model, the overvoltage level at different positions of the new energy sending-out system when faults occur at different positions is researched; the working conditions researched include single-phase, two-phase, and three-phase ground faults occurring at different positions of the new energy sending-out system;

[0022] The overvoltage withstand capability of each device of the new energy sending-out system is determined, and if the overvoltage level at a position exceeds the overvoltage withstand capability of the device, the overvoltage is excessive, so that the overvoltage excessive position of the new energy sending-out system is determined.

[0023] Optionally, for the most serious overvoltage excessive position in step 3, the parameters of the overvoltage suppression device are determined, including:

[0024] According to the maximum operating voltage of the system at the most serious overvoltage excessive position, the rated voltage of the overvoltage suppression device is determined; wherein the rated voltage of the overvoltage suppression device is the sum of the rated voltage of the first lightning arrester and the rated voltage of the second lightning arrester;

[0025] According to the overvoltage amplitude and the control level of the new energy sending-out system, the rated voltage of the first lightning arrester is determined;

[0026] According to the rated voltage of the overvoltage suppression device and the rated voltage of the first lightning arrester, the rated voltage of the second lightning arrester is determined;

[0027] The parallel number of the lightning arrester is determined.

[0028] Optionally, in step 6, if the overvoltage at the current installation position is excessive, the parameters of the overvoltage suppression device are adjusted, including: if the overvoltage at the current installation position is excessive, the rated voltage of the first lightning arrester is reduced.

[0029] Optionally, in step 7, if the energy consumption of the overvoltage suppression device is excessive, the parameters of the overvoltage suppression device are adjusted, including: if the energy consumption of the overvoltage suppression device is excessive, the parallel number of the lightning arrester is increased.

[0030] According to another aspect of the present application, a new energy sending-out system overvoltage suppression system is provided, including:

[0031] An overvoltage excessive position determination module is configured to establish an electromagnetic transient simulation model according to the device parameters of the new energy sending-out system, and determine the overvoltage excessive position of the new energy sending-out system based on the electromagnetic transient simulation model;

[0032] The first judging module is configured to judge whether there is an overvoltage exceeding position in the new energy sending-out system.

[0033] The device parameter determining module is configured to determine parameters of the overvoltage suppression device for the most serious overvoltage exceeding position when the new energy sending-out system has the overvoltage exceeding position.

[0034] The simulation calculation module is configured to install the overvoltage suppression device at the most serious overvoltage exceeding position according to the determined parameters, and then simulate and calculate the overvoltage level of the new energy sending-out system through an electromagnetic transient simulation model.

[0035] The second judging module is configured to judge whether the current installation position of the overvoltage suppression device exceeds the overvoltage according to the overvoltage level.

[0036] The parameter adjusting module is configured to adjust the parameters of the overvoltage suppression device if the current installation position exceeds the overvoltage, and then enter the simulation calculation module; or enter the third judging module if the current installation position does not exceed the overvoltage.

[0037] The third judging module is configured to judge whether the energy consumption of the overvoltage suppression device exceeds the standard; if the energy consumption of the overvoltage suppression device exceeds the standard, adjust the parameters of the overvoltage suppression device, and then enter the simulation calculation module; or enter the fourth judging module if the energy consumption of the overvoltage suppression device does not exceed the standard.

[0038] The fourth judging module is configured to judge whether the rest positions of the new energy sending-out system except the most serious overvoltage exceeding position exceed the overvoltage; if the rest positions exceed the overvoltage, enter the device parameter determining module; or determine the overvoltage suppression scheme of the new energy sending-out system if the rest positions do not exceed the overvoltage, and suppress the overvoltage of the new energy sending-out system according to the overvoltage suppression scheme.

[0039] According to still another aspect of the present application, a computer readable storage medium is provided, which stores a computer program for executing the method according to any one of the above aspects of the present application.

[0040] According to still another aspect of the present application, an electronic device is provided, which comprises a processor, a memory for storing executable instructions of the processor, and the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of the above aspects of the present application.

[0041] The application firstly establishes an electromagnetic transient simulation model according to the equipment parameters of the new energy sending-out system, and determines the overvoltage exceeding position of the new energy sending-out system based on the electromagnetic transient simulation model. Then, the parameters of the overvoltage suppression device are determined for the most serious overvoltage exceeding position. Secondly, when the suppression device is configured, the simulation is carried out according to the installation effect of different positions, and the overvoltage is installed in the position with the highest level. After the electromagnetic transient simulation model is simulated and calculated, if there is still an exceeding position, the overvoltage is installed in the position with the highest level in the remaining exceeding position, until all positions are not exceeded. Finally, the overvoltage suppression scheme of the new energy sending-out system is determined, and the overvoltage of the new energy sending-out system is suppressed according to the overvoltage suppression scheme. The application can quickly respond to the transient and temporary overvoltage of the new energy sending-out system, ensure the safety of the equipment, and avoid the new energy off-grid. BRIEF DESCRIPTION OF DRAWINGS

[0042] The exemplary embodiments of the application can be more completely understood in reference to the following drawings:

[0043] Figure 1 is a flowchart of the overvoltage suppression method of the new energy sending-out system in the embodiment of the application;

[0044] Figure 2 is a whole flowchart of the overvoltage suppression method of the new energy sending-out system in the embodiment of the application;

[0045] Figure 3 is a principle schematic diagram of the overvoltage suppression device in the embodiment of the application;

[0046] Figure 4 is a wiring schematic diagram of the grounding system and the overvoltage suppression device in the embodiment of the application;

[0047] Figure 5 is a wiring schematic diagram of the ungrounded system and the overvoltage suppression device in the embodiment of the application;

[0048] Figure 6 is a typical new energy sending-out system structure diagram in the embodiment of the application;

[0049] Figure 7 is an overvoltage comparison schematic diagram with and without measures for the 35kV bus in the embodiment of the application;

[0050] Figure 8 is an overvoltage comparison schematic diagram with and without measures for the 220kV bus in the embodiment of the application;

[0051] Figure 9 is a structure schematic diagram of an electronic device in an embodiment of the application. DETAILED DESCRIPTION

[0052] The embodiments of the present application will be described below in detail, and the following description relates to the accompanying drawings, wherein the same or similar elements are denoted by the same reference numerals unless otherwise indicated, and the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of the present application.

[0053] It should be understood that, in the description of all the embodiments of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] Figure 1 The flowchart of the overvoltage suppression method of the new energy sending-out system provided by the present application is shown. As shown in the figure, Figure 1 The overvoltage suppression method of the new energy sending-out system comprises:

[0055] Step 1: According to the device parameters of the new energy sending-out system, an electromagnetic transient simulation model is established, and the overvoltage exceeding position of the new energy sending-out system is determined based on the electromagnetic transient simulation model.

[0056] Optionally, in step 1, the electromagnetic transient simulation model is established according to the device parameters of the new energy sending-out system, and the overvoltage exceeding position of the new energy sending-out system is determined based on the electromagnetic transient simulation model, which comprises: according to the control characteristics of the new energy unit in the new energy sending-out system, the working characteristics of the key equipment, the simulation characteristics of the transmission line, and the action characteristics of the relay protection and circuit breaker, the electromagnetic transient simulation model is established; wherein the key equipment includes transformer, reactor, arrester; based on the established electromagnetic transient simulation model, the overvoltage level of different positions when faults occur at different positions of the new energy sending-out system is studied; wherein the working conditions studied include: single-phase, two-phase, three-phase ground faults occur at different positions of the new energy sending-out system; the overvoltage tolerance of each device of the new energy sending-out system is determined, and if the overvoltage level at a certain position exceeds the overvoltage tolerance of the device, it is an overvoltage exceeding position, so as to determine the overvoltage exceeding position of the new energy sending-out system.

[0057] In the embodiments of the present application, as Figure 2As shown, the electromagnetic transient simulation model can be established according to the equipment parameters of the new energy sending-out system, and specifically includes: the model considers the control characteristics of the new energy unit; the simulation models of the transformer, the electric reactor, the lightning arrester and the like, and the simulation model of the transmission line; and the simulation model of the action characteristics of the relay protection and the circuit breaker.

[0058] The overvoltage exceeding position of the new energy sending-out system is determined based on the electromagnetic transient simulation model, and specifically includes: on the basis of the established simulation model, the overvoltage levels at different positions when faults occur at different positions of the system are researched, and the working conditions researched include: single-phase, two-phase and three-phase ground faults occurring at different positions of the system. The research adopts a statistical calculation method, considers the dispersion of the fault occurrence, the protection and the circuit breaker action time, and researches the overvoltage transient waveform of each point in the system under different fault time, different protection action time and circuit breaker opening time. According to the overvoltage statistical calculation result, the actual overvoltage characteristics of each equipment at different positions, the maximum peak value and the occurrence time of the overvoltage, and the maximum value of the effective value of the fundamental component of the overvoltage are obtained. Then, the overvoltage exceeding position is determined according to the overvoltage resistance capability of the equipment. The overvoltage resistance capability of each equipment is determined according to the equipment test or design parameters, and includes: the short-time power frequency overvoltage resistance level UTOV and the allowed duration T1, the operating impulse voltage resistance level USFV and the lightning impulse voltage resistance level ULIV. The overvoltage exceeding the equipment resistance capability is exceeding. For the points provided with overvoltage protection, the calculation is performed according to the overvoltage protection algorithm and the action setting value, and if the overvoltage protection action is caused, it is also regarded as exceeding.

[0059] Step 2: determining whether the new energy sending-out system has an overvoltage exceeding position;

[0060] Step 3: when the new energy sending-out system has an overvoltage exceeding position, the parameters of the overvoltage suppression device are determined for the most serious overvoltage exceeding position;

[0061] Optionally, the overvoltage suppression device includes a first metal oxide voltage limiter and a second metal oxide voltage limiter connected in series, the first metal oxide voltage limiter is connected with the live wire through a connection switch, the second metal oxide voltage limiter is grounded, and the second metal oxide voltage limiter is connected in parallel with the mechanical switch and the power electronic switch.

[0062] In the embodiment of the application, the principle of the single-phase overvoltage limiting device is as shown in Figure 3 The overvoltage limiting device includes: two metal oxide voltage limiters MOA1 and MOA2 connected in series, wherein MOA2 is connected in parallel with the mechanical switch and the power electronic switch, and the power electronic switch can also be realized by a triggered spark gap or the like according to the needs. The power electronic switch and the mechanical switch accept external control commands to realize fast conduction and turn-off.

[0063] According to the system conditions of the applied position, the three-phase arrangement can have different arrangements. Typical system arrangements are shown in Figure 4 For ungrounded system arrangements, the Figure 5 , and the three-phase overvoltage suppression device adopts a delta connection to achieve better suppression effect.

[0064] Alternatively, the action strategy of the overvoltage suppression device is: under normal operation of the new energy sending-out system, the mechanical switch and the power electronic switch are both in an open state, and the connecting switch is in a closed state; when it is detected that the voltage of the new energy sending-out system decreases for more than 20 ms, the power electronic switch and the mechanical switch are commanded to close; when the voltage of the new energy sending-out system recovers and lasts for 0.1 s, the mechanical switch and the power electronic switch are commanded to open to restore the normal state; when it is detected that the voltage of the new energy sending-out system exceeds 1.3 p.u., the power electronic switch and the mechanical switch are commanded to close, and the opening command of the power electronic switch and the mechanical switch is sent after a delay of 100 ms; the energy of the arrester is continuously monitored and calculated, and when the energy of the arrester exceeds the allowed value, the connecting switch is commanded to open to protect the arrester body.

[0065] In the embodiment of the present application, the action strategy of the overvoltage suppression device is as follows:

[0066] 1) Under normal operation of the new energy sending-out system, the mechanical switch and the power electronic switch are both in an open state, and the connecting switch is in a closed state.

[0067] 2) When it is detected that the voltage of the new energy sending-out system decreases for more than 20 ms, the power electronic switch and the mechanical switch are commanded to close. After a short-circuit fault occurs in the new energy sending-out system, a high overvoltage may occur during the fault clearing process, causing the unit to be disconnected from the grid. Therefore, when the voltage decrease is detected, the power electronic switch is commanded to close to suppress the subsequent overvoltage that may be generated. When the voltage of the new energy sending-out system recovers, the mechanical switch and the power electronic switch are commanded to open after lasting for 0.1 s to restore the normal state.

[0068] 3) When it is detected that the voltage of the new energy sending-out system exceeds 1.3 p.u., the power electronic switch and the mechanical switch are commanded to close, and the opening command of the power electronic switch and the mechanical switch is sent after a delay of 100 ms.

[0069] 4) The energy of the arrester is continuously monitored and calculated, and when the energy of the arrester exceeds the allowed value, the connecting switch is commanded to open to protect the arrester body.

[0070] Optionally, in step 3, the parameters of the overvoltage suppression device are determined for the most serious overvoltage exceeding position, including: determining the rated voltage of the overvoltage suppression device according to the system maximum operating voltage of the most serious overvoltage exceeding position; wherein the rated voltage of the overvoltage suppression device is the sum of the rated voltage of the first lightning arrester and the rated voltage of the second lightning arrester; determining the rated voltage of the first lightning arrester according to the overvoltage amplitude and the control level of the new energy sending-out system; determining the rated voltage of the second lightning arrester according to the rated voltage of the overvoltage suppression device and the rated voltage of the first lightning arrester; and determining the parallel number of the lightning arrester.

[0071] In the embodiment of the application, the rated voltage of the overvoltage suppression device can be determined according to the system maximum operating voltage Um of the exceeding point. The rated voltage U R _all is the sum of the rated voltage Ur_moa1 of the lightning arrester 1 and the rated voltage Ur_moa2 of the lightning arrester 2. When determining the overall rated voltage, it is necessary to ensure that the two groups of lightning arresters can be operated for a long time under the system maximum voltage, and it is necessary to meet U R_All ≥1.3U m .

[0072] Further, the rated voltage Ur_moa1 of the lightning arrester 1 is determined according to the overvoltage amplitude and the control level. Specifically, in order to limit the overvoltage within the allowable range, the lightning arrester 1 should be able to act to limit under overvoltage while ensuring its own safety. If the defined target limit value is U Limit , in order to protect the safety of the lightning arrester, it is necessary to meet: wherein Ks is the system considering the temporary overvoltage resistance capability of the lightning arrester, which is determined according to the manufacturing capability of the lightning arrester, and generally can be taken in the range of 1.1-1.2.

[0073] After determining the rated voltage of the lightning arrester 1, the rated voltage of the lightning arrester 2 is determined. Then, the parallel number of the lightning arrester needs to be determined. Specifically, first, the suppression effect of the overvoltage needs to be considered, and the more the parallel number is, the better the effect is. According to the voltage-current characteristic curve of the lightning arrester 1, the voltage-current characteristic curve under different parallel numbers can be obtained, in order to protect the overvoltage within the target range U Limit , the value corresponding to U Limit on the voltage-current curve should not be less than 500A. According to this, the minimum value of the parallel number can be determined. Secondly, the energy absorption of the lightning arrester also needs to be considered, and the more the parallel number of the lightning arrester is, the greater the energy level that can be absorbed is. The energy consumption of the lightning arrester needs to be determined according to the simulation.

[0074] Step 4: installing the overvoltage suppression device at the most serious overvoltage exceeding position according to the determined parameters, and then simulating and calculating the overvoltage level of the new energy sending-out system through an electromagnetic transient simulation model;

[0075] In this embodiment of the invention, depending on the location of the overvoltage, the installation location may include the new energy generator end, generally the 690V side; the high-voltage side of the new energy generator step-up transformer is generally the 35kV or 66kV side, and the low-voltage side of the collection station is 35kV or 66kV; the high-voltage side of the collection station is generally 110kV or 220kV. When configuring the overvoltage suppression device, simulations are conducted based on the installation effect at different locations. First, the device is installed at the location with the highest overvoltage level. After calculation, if there are still locations with overvoltage, the device is installed at the location with the highest overvoltage after the remaining locations, until all locations are within acceptable limits. If the overvoltage limiting effect cannot meet the requirements during the simulation, the rated voltage of surge arrester 1 can be reduced, and iterative calculations can be performed again. The energy consumption absorbed by the surge arrester is checked during the simulation. If the energy consumption absorbed by the surge arrester exceeds the requirements, the corresponding number of parallel connections is increased.

[0076] Step 5: Determine whether the overvoltage suppression device is installed at the current location and whether the overvoltage exceeds the limit based on the overvoltage level;

[0077] Step 6: If the overvoltage at the current installation location exceeds the limit, adjust the parameters of the overvoltage suppression device, and then proceed to Step 4; if the overvoltage at the current installation location does not exceed the limit, proceed to Step 7.

[0078] Optionally, if the overvoltage at the current installation location exceeds the standard in step 6, the parameters of the overvoltage suppression device are adjusted, including: if the overvoltage at the current installation location exceeds the standard, the rated voltage of the first surge arrester is reduced.

[0079] Step 7: Determine if the energy consumption of the overvoltage suppression device exceeds the standard; if the energy consumption of the overvoltage suppression device exceeds the standard, adjust the parameters of the overvoltage suppression device, and then proceed to step 4; if the energy consumption of the overvoltage suppression device does not exceed the standard, proceed to step 8.

[0080] Optionally, if the energy consumption of the overvoltage suppression device exceeds the standard in step 7, the parameters of the overvoltage suppression device shall be adjusted, including: if the energy consumption of the overvoltage suppression device exceeds the standard, the number of surge arresters connected in parallel shall be increased.

[0081] Step 8: Determine whether the overvoltage exceeds the limit at any other location in the new energy transmission system except for the most severe overvoltage location; if the overvoltage exceeds the limit at any other location, proceed to Step 3; if the overvoltage does not exceed the limit at any other location, determine the overvoltage suppression scheme for the new energy transmission system, and suppress the overvoltage in the new energy transmission system according to the overvoltage suppression scheme.

[0082] The following will address Figure 6 The typical new energy transmission system shown has been analyzed for its overvoltage suppression effect:

[0083] Table 1 shows the overvoltage levels of the new energy transmission system before and after using this method. Figure 7The overvoltage waveforms before and after the measures are taken are given respectively. Figure 8 It can be seen that the overvoltages on the 35kV and 220kV sides are obviously reduced.

[0084] Table 1

[0085]

[0086] In summary, the application first establishes an electromagnetic transient simulation model according to the device parameters of the new energy sending-out system, and determines the overvoltage exceeding position of the new energy sending-out system based on the electromagnetic transient simulation model. Then, for the most serious overvoltage exceeding position, the parameters of the overvoltage suppression device are determined. Secondly, when configuring the suppression device, simulation is carried out according to the installation effect of different positions, and the overvoltage is installed in the position with the highest level. After simulating and calculating the overvoltage level of the new energy sending-out system through the electromagnetic transient simulation model, if there are still exceeding positions, continue to install in the position with the highest overvoltage among the remaining exceeding positions, until all positions do not exceed. Finally, the overvoltage suppression scheme of the new energy sending-out system is determined, and the overvoltage of the new energy sending-out system is suppressed according to the overvoltage suppression scheme. The application can quickly respond to the transient and temporary overvoltage of the new energy sending-out system, ensure the safety of the equipment, and avoid the new energy off-grid.

[0087] Exemplary System

[0088] The application further provides an overvoltage suppression system of a new energy sending-out system, which comprises:

[0089] An overvoltage exceeding position determination module is configured to establish an electromagnetic transient simulation model according to the device parameters of the new energy sending-out system, and determine the overvoltage exceeding position of the new energy sending-out system based on the electromagnetic transient simulation model.

[0090] A first judgment module is configured to judge whether the new energy sending-out system has an overvoltage exceeding position.

[0091] A device parameter determination module is configured to, when the new energy sending-out system has an overvoltage exceeding position, determine the parameters of the overvoltage suppression device for the most serious overvoltage exceeding position.

[0092] A simulation calculation module is configured to install the overvoltage suppression device at the most serious overvoltage exceeding position according to the determined parameters, and then simulate and calculate the overvoltage level of the new energy sending-out system through the electromagnetic transient simulation model.

[0093] A second judgment module is configured to judge whether the current installation position of the overvoltage suppression device exceeds the overvoltage according to the overvoltage level.

[0094] The parameter adjustment module is configured to adjust parameters of the overvoltage suppression device if the overvoltage at the current installation position exceeds the standard, and then enter the simulation calculation module; if the overvoltage at the current installation position does not exceed the standard, enter the third judgment module.

[0095] The third judgment module is configured to judge whether the energy consumption of the overvoltage suppression device exceeds the standard; if the energy consumption of the overvoltage suppression device exceeds the standard, adjust the parameters of the overvoltage suppression device, and then enter the simulation calculation module; if the energy consumption of the overvoltage suppression device does not exceed the standard, enter the fourth judgment module.

[0096] The fourth judgment module is configured to judge whether the overvoltage at the positions other than the most serious overvoltage exceeding position in the new energy sending system exceeds the standard; if the overvoltage at the positions other than the most serious overvoltage exceeding position exceeds the standard, enter the device parameter determination module; if the overvoltage at the positions other than the most serious overvoltage exceeding position does not exceed the standard, determine the overvoltage suppression scheme of the new energy sending system, and suppress the overvoltage of the new energy sending system according to the overvoltage suppression scheme.

[0097] The overvoltage suppression system of the new energy sending system of the embodiment of the present application corresponds to the overvoltage suppression method of the new energy sending system of another embodiment of the present application, which will not be described here.

[0098] Exemplary Electronic Device

[0099] Figure 9 is the structure of an electronic device provided by an exemplary embodiment of the present application. As shown in Figure 9 the electronic device 90 includes one or more processors 91 and a memory 92.

[0100] The processor 91 can be a central processing unit (CPU) or other form of processing unit having data processing and / or instruction execution capabilities, and can control other components in the electronic device to perform desired functions.

[0101] The memory 92 can include one or more computer program products, which can include various forms of computer readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM), cache memory, and / or the like. The non-volatile memory may, for example, include read-only memory (ROM), hard disk, flash memory, and / or the like. One or more computer program instructions can be stored on the computer readable storage medium, and the processor 91 can run the program instructions to implement the method of information mining on the history change record of the software program of each embodiment of the present application and / or other desired functions described above. In one example, the electronic device can also include an input device 93 and an output device 94, which are interconnected by a bus system and / or other form of connection mechanism (not shown).

[0102] Further, the input device 93 can include, for example, a keyboard, a mouse, and the like.

[0103] The output device 94 can output various information to the outside. The output device 94 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0104] Of course, in order to simplify, Figure 9 In FIG. 9, only some of the components of the electronic device related to the present application are shown, and components such as a bus, an input / output interface, and the like are omitted. In addition to this, the electronic device can include any other appropriate components according to the specific application.

[0105] Exemplary Computer Program Product and Computer-Readable Storage Medium

[0106] In addition to the above-mentioned methods and devices, embodiments of the present application can also be a computer program product including computer program instructions, which, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present application described in the above "Exemplary Methods" section of the specification.

[0107] The computer program product can be written in any combination of one or more programming languages, including an object-oriented programming language such as Java, C++, and the like, and conventional procedural programming languages, such as the "C" programming language, or the like. The program code can execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.

[0108] In addition, embodiments of the present application can also be a computer readable storage medium having stored thereon computer program instructions, which, when executed by a processor, cause the processor to perform the steps of the method of information mining on the history change record according to various embodiments of the present application described in the above "Exemplary Methods" section of the specification.

[0109] The computer readable storage medium can be any combination of one or more computer readable medium(s). The computer readable medium can be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or apparatus or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0110] The above generally describes the basic principles of the application in conjunction with specific embodiments, but it should be noted that the advantages, benefits, effects and the like mentioned in the application are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as necessary for each embodiment of the application. In addition, the above specific details disclosed are only for the purpose of example and understanding, and are not limiting, and the above details do not limit the application to the above specific details.

[0111] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between each embodiment can be mutually referred to. For system embodiments, since they basically correspond to method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0112] The block diagrams of the devices, systems, apparatuses, systems involved in the application are only illustrative examples and are not intended to require or imply that the connection, arrangement, configuration must be as shown in the block diagram. As those skilled in the art will recognize, these devices, systems, apparatuses, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, which mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0113] The methods, systems, and storage media of the present application can be implemented in numerous ways. For example, the methods, systems, and storage media of the present application can be implemented using software, hardware, firmware, or any combination of software, hardware, and / or firmware. The order of any steps described above is merely exemplary and the steps of the methods of the present application need not be performed in the order described, unless otherwise specified. Furthermore, any steps described above can be performed in any order, unless otherwise specified, unless otherwise specified. Additionally, in some embodiments, the present application can be implemented as a routine storage media having a program recorded thereon, the program including instructions to implement the methods according to the present application. Thus, the present application also covers a record medium storing a program to implement the methods according to the present application.

[0114] It is also important to note that the systems, devices and methods of the present application can be embodied in a variety of forms. Therefore, the above description should not be construed as limiting, but merely as illustrative. Many other variations are possible whose details would still be encompassed by the scope of the present application as defined by the appended claims, depending on the design constraints and other implementation-specific requirements.

[0115] The above description is intended to be illustrative and not restrictive. For example, the above-described embodiments (or aspects thereof) can be used in combination with each other. Other embodiments will be readily apparent to those skilled in the art from this description and the accompanying drawings. The scope of the application should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with their full scope of equivalents.

Claims

1. A method for overvoltage suppression of a new energy transmission system, characterized in that, The method comprises the following steps: Step 1: An electromagnetic transient simulation model is established according to the device parameters of the new energy sending-out system, and the overvoltage exceeding position of the new energy sending-out system is determined based on the electromagnetic transient simulation model; Step 2: It is judged whether the new energy sending-out system has an overvoltage exceeding position; Step 3: When the new energy sending-out system has an overvoltage exceeding position, the parameters of the overvoltage suppression device are determined for the most serious overvoltage exceeding position; Step 4: The overvoltage suppression device is installed at the most serious overvoltage exceeding position according to the determined parameters, and then the overvoltage level of the new energy sending-out system is simulated and calculated through the electromagnetic transient simulation model; Step 5: It is judged whether the current installation position of the overvoltage suppression device exceeds the overvoltage according to the overvoltage level; Step 6: If the current installation position exceeds the overvoltage, the parameters of the overvoltage suppression device are adjusted, and then step 4 is entered; if the current installation position does not exceed the overvoltage, step 7 is entered; Step 7: It is judged whether the energy consumption of the overvoltage suppression device exceeds the standard; if the energy consumption of the overvoltage suppression device exceeds the standard, the parameters of the overvoltage suppression device are adjusted, and then step 4 is entered; if the energy consumption of the overvoltage suppression device does not exceed the standard, step 8 is entered; Step 8: It is judged whether the remaining positions in the new energy sending-out system except the most serious overvoltage exceeding position exceed the overvoltage; if the remaining positions exceed the overvoltage, step 3 is entered; if the remaining positions do not exceed the overvoltage, the overvoltage suppression scheme of the new energy sending-out system is determined, and the new energy sending-out system is suppressed according to the overvoltage suppression scheme.

2. The method of claim 1, wherein, The overvoltage suppression device comprises a first metal oxide voltage limiter and a second metal oxide voltage limiter connected in series, the first metal oxide voltage limiter is connected with a live wire through a connecting switch, the second metal oxide voltage limiter is grounded, and the second metal oxide voltage limiter is connected in parallel with a mechanical switch and a power electronic switch.

3. The method of claim 2, wherein, The action strategy of the overvoltage suppression device is as follows: Under normal operation of the new energy sending-out system, the mechanical switch and the power electronic switch are both in an open state, and the connecting switch is in a closed state; When it is detected that the voltage of the new energy sending-out system is reduced for more than 20 ms, the power electronic switch and the mechanical switch are commanded to be closed; after the voltage of the new energy sending-out system is restored and lasts for 0.1 s, the mechanical switch and the power electronic switch are commanded to be opened to restore the normal state; When it is detected that the voltage of the new energy sending-out system exceeds 1.3 p.u., the power electronic switch and the mechanical switch are commanded to be closed, and the opening command of the power electronic switch and the mechanical switch is sent after a delay of 100 ms; The energy of the lightning arrester is continuously monitored and calculated, and when the energy of the lightning arrester exceeds the allowed value, the connecting switch is commanded to be opened to protect the body of the lightning arrester.

4. The method of claim 1, wherein, In step 1, the electromagnetic transient simulation model is established according to the device parameters of the new energy sending-out system, and the overvoltage exceeding position of the new energy sending-out system is determined based on the electromagnetic transient simulation model, which comprises the following steps: The electromagnetic transient simulation model is established according to the control characteristics of the new energy units in the new energy sending-out system, the working characteristics of the key devices, the simulation characteristics of the transmission lines, and the action characteristics of the relay protection and circuit breaker; wherein the key devices include transformers, reactors, lightning arresters; On the basis of the established electromagnetic transient simulation model, overvoltage levels at different positions of the new energy sending-out system when faults occur at different positions are researched, wherein the researched working conditions include single-phase, two-phase and three-phase ground faults occurring at different positions of the new energy sending-out system; The overvoltage tolerance of each device of the new energy sending-out system is determined, and if the overvoltage level at a position exceeds the overvoltage tolerance of the device, the position is determined as an overvoltage exceeding position of the new energy sending-out system.

5. The method of claim 4, wherein, In step 3, parameters of the overvoltage suppression device are determined for the most serious overvoltage exceeding position, including: The rated voltage of the overvoltage suppression device is determined according to the maximum operating voltage of the system at the most serious overvoltage exceeding position, wherein the rated voltage of the overvoltage suppression device is the sum of the rated voltage of the first arrester and the rated voltage of the second arrester; The rated voltage of the first arrester is determined according to the overvoltage amplitude and control level of the new energy sending-out system; The rated voltage of the second arrester is determined according to the rated voltage of the overvoltage suppression device and the rated voltage of the first arrester; The parallel number of the arrester is determined.

6. The method of claim 5, wherein, In step 6, if the current installation position exceeds the overvoltage, the parameters of the overvoltage suppression device are adjusted, including: if the current installation position exceeds the overvoltage, the rated voltage of the first arrester is reduced.

7. The method of claim 6, wherein, In step 7, if the energy consumption of the overvoltage suppression device exceeds the standard, the parameters of the overvoltage suppression device are adjusted, including: if the energy consumption of the overvoltage suppression device exceeds the standard, the parallel number of the arrester is increased.

8. An overvoltage suppression system for a new energy transmission system, characterized by, including: An overvoltage exceeding position determination module is configured to establish an electromagnetic transient simulation model according to device parameters of the new energy sending-out system, and determine overvoltage exceeding positions of the new energy sending-out system based on the electromagnetic transient simulation model; A first judgment module is configured to determine whether there is an overvoltage exceeding position in the new energy sending-out system; A device parameter determination module is configured to, when there is an overvoltage exceeding position in the new energy sending-out system, determine parameters of the overvoltage suppression device for the most serious overvoltage exceeding position; A simulation calculation module is configured to install the overvoltage suppression device at the most serious overvoltage exceeding position according to the determined parameters, and then simulate and calculate the overvoltage level of the new energy sending-out system through the electromagnetic transient simulation model; A second judgment module is configured to determine whether the current installation position of the overvoltage suppression device exceeds the overvoltage according to the overvoltage level; A parameter adjustment module is configured to, if the current installation position exceeds the overvoltage, adjust the parameters of the overvoltage suppression device, and then enter the simulation calculation module; if the current installation position does not exceed the overvoltage, enter a third judgment module; The third judgment module is configured to determine whether the energy consumption of the overvoltage suppression device exceeds the standard; if the energy consumption of the overvoltage suppression device exceeds the standard, adjust the parameters of the overvoltage suppression device, and then enter the simulation calculation module; if the energy consumption of the overvoltage suppression device does not exceed the standard, enter a fourth judgment module; The fourth judgment module is configured to determine whether the remaining positions except the most serious overvoltage exceeding position in the new energy sending-out system exceed the overvoltage; If the remaining positions exceed the overvoltage, enter the device parameter determination module; If the rest of the positions do not exceed the overvoltage, an overvoltage suppression scheme of the new energy sending-out system is determined, and overvoltage suppression is performed on the new energy sending-out system according to the overvoltage suppression scheme.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is used for executing the method in any one of claims 1-7.

10. An electronic device, comprising: The electronic device includes: a processor; a memory for storing executable instructions of the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method in any one of claims 1-7.

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