Wind power non-full-phase working condition detection method, device, controller, system and medium

Abstract

The invention discloses a wind power non-full-phase working condition detection method and device, a controller, a system and a medium, and belongs to the technical field of wind power. The method comprises the following steps: synchronously acquiring three-phase current at the other end of the collection transformer and three-phase voltage at the alternating current end of the grid-side converter; respectively obtaining an effective current extreme value of the three-phase current and an effective voltage extreme value of the three-phase voltage according to the three-phase current and the three-phase voltage; and in response to the fact that the effective current extreme value exceeds the preset full-phase operation current range and the effective voltage extreme value exceeds the preset full-phase operation voltage range, a first detection result is output, and the first detection result represents that the wind power output system is in a non-full-phase working condition. According to the embodiment of the invention, the safety of the wind power transmission system can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind power, and particularly relates to a detection method, device, controller, system and medium for a non-full-phase working condition of wind power. BACKGROUND

[0002] Under the background of low carbon and environmental protection, renewable resources such as wind power have been widely promoted. In areas rich in wind resources, wind farms can be established, and wind turbines in the wind farm can convert wind energy into electrical energy. The electrical energy converted by the wind turbines in the wind farm is collected and transmitted to the power grid to enable the power grid to distribute electrical energy. Since the areas rich in wind resources are often remote, the wind farm and the power grid have a very long distance between them. The long distance between the wind farm and the power grid makes the transmission line impedance between the wind farm and the power grid large, so that the wind power sending system in which the wind turbines are located becomes a weak system with low grid strength and weak anti-interference ability.

[0003] In the case of a single-phase fault or a two-phase fault in the wind power sending system, the relay protection will be triggered to disconnect the faulty single-phase or two-phase. In this case, the wind power sending system will be in a non-full-phase working condition. Due to the poor stability and high voltage sensitivity of the weak system, voltage oscillation, transient overvoltage and other problems are prone to occur, which brings great safety risks to the wind power sending system. SUMMARY

[0004] The embodiments of the application provide a detection method, device, controller, system and medium for a non-full-phase working condition of wind power, which can detect the non-full-phase working condition of the wind power sending system, so that measures can be taken in time to improve the safety of the wind power sending system.

[0005] In a first aspect, the embodiments of the application provide a detection system for a non-full-phase working condition of wind power, which is applied to a wind power sending system. The wind power sending system includes wind turbines and a collection transformer. The wind turbines include grid-side converters. The AC end of the grid-side converter of each wind turbine is connected to one end of the collection transformer through a collection line. The other end of the collection transformer is configured to be connected to a power grid.

[0006] The system comprises: a control unit of the grid-side converter, configured to collect three-phase voltages of an alternating current end of the grid-side converter; a current sensor arranged at the other end of the collection transformer and configured to collect three-phase currents of the other end of the collection transformer; a station data acquisition device connected with the current sensor and configured to acquire the three-phase currents from the current sensor; and a controller connected with the station data acquisition device through a first communication line and connected with the control unit of the grid-side converter through a second communication line, configured to synchronously acquire the three-phase currents and the three-phase voltages, obtain effective current extreme values of the three-phase currents and effective voltage extreme values of the three-phase voltages according to the three-phase currents and the three-phase voltages, and output a first detection result in response to the effective current extreme values exceeding a preset full-phase operation current range and the effective voltage extreme values exceeding a preset full-phase operation voltage range, the first detection result indicating that the wind power sending system is in a non-full-phase operating condition.

[0007] In some possible embodiments, the controller is specifically configured to: obtain three-phase effective currents of the three-phase currents according to the three-phase currents, and determine a maximum value and a minimum value in the three-phase effective currents as the effective current extreme values of the three-phase currents; and obtain three-phase effective voltages of the three-phase voltages according to the three-phase voltages, and determine a maximum value and a minimum value in the three-phase effective voltages as the effective voltage extreme values of the three-phase voltages.

[0008] In some possible embodiments, the effective current extreme values exceeding the preset full-phase operation current range comprises: the effective current maximum value being greater than an upper limit value of the full-phase operation current range, and the effective current minimum value being less than a lower limit value of the full-phase operation current range.

[0009] The effective voltage extreme values exceeding the preset full-phase operation voltage range comprises: the effective voltage maximum value being greater than an upper limit value of the full-phase operation voltage range, and the effective voltage minimum value being less than a lower limit value of the full-phase operation voltage range.

[0010] In some possible embodiments, the controller is further configured to: output a second detection result in response to the effective current extreme values being located within the full-phase operation current range and / or the effective voltage extreme values being located within the full-phase operation voltage range, the second detection result indicating that the wind power sending system is not in the non-full-phase operating condition.

[0011] In some possible embodiments, the controller is specifically configured to: output the first detection result in response to the effective current extreme values exceeding the full-phase operation current range and the effective voltage extreme values corresponding to at least one wind turbine exceeding the full-phase operation voltage range.

[0012] In some possible embodiments, the second communication line comprises a fiber ring network line; and the controller comprises a station-level controller of the wind farm or a main controller of the wind turbine.

[0013] In a second aspect, the embodiments of the present application provide a method for detecting a non-full-phase operating condition of a wind power system. The method is applied to a wind power system, and the wind power system includes wind turbines and a collection transformer. Each of the wind turbines includes a grid-side converter. An AC end of the grid-side converter of each of the wind turbines is connected to one end of the collection transformer through a collection line. The other end of the collection transformer is configured to be connected to a power grid.

[0014] The method includes: synchronously obtaining three-phase currents at the other end of the collection transformer and three-phase voltages at the AC end of the grid-side converter; obtaining effective current extreme values of the three-phase currents and effective voltage extreme values of the three-phase voltages respectively according to the three-phase currents and the three-phase voltages; and outputting a first detection result in response to the effective current extreme values being outside a preset full-phase operating current range and the effective voltage extreme values being outside a preset full-phase operating voltage range. The first detection result indicates that the wind power system is in the non-full-phase operating condition.

[0015] In some possible embodiments, the obtaining of the effective current extreme values of the three-phase currents and the effective voltage extreme values of the three-phase voltages according to the three-phase currents and the three-phase voltages includes: obtaining three-phase effective currents of the three-phase currents according to the three-phase currents, and determining maximum and minimum values in the three-phase effective currents as the effective current extreme values of the three-phase currents; and obtaining three-phase effective voltages of the three-phase voltages according to the three-phase voltages, and determining maximum and minimum values in the three-phase effective voltages as the effective voltage extreme values of the three-phase voltages.

[0016] In some possible embodiments, the effective current extreme values being outside the preset full-phase operating current range includes: a maximum effective current value being greater than an upper limit value of the full-phase operating current range, and a minimum effective current value being less than a lower limit value of the full-phase operating current range.

[0017] The effective voltage extreme values being outside the preset full-phase operating voltage range includes: a maximum effective voltage value being greater than an upper limit value of the full-phase operating voltage range, and a minimum effective voltage value being less than a lower limit value of the full-phase operating voltage range.

[0018] In some possible embodiments, the method further includes: outputting a second detection result in response to the effective current extreme values being within the full-phase operating current range and / or the effective voltage extreme values being within the full-phase operating voltage range. The second detection result indicates that the wind power system is not in the non-full-phase operating condition.

[0019] In some possible embodiments, the outputting of the first detection result in response to the effective current extreme values being outside the preset full-phase operating current range and the effective voltage extreme values being outside the preset full-phase operating voltage range includes: outputting the first detection result in response to the effective current extreme values being outside the full-phase operating current range and effective voltage extreme values corresponding to at least one of the wind turbines being outside the full-phase operating voltage range.

[0020] In a third aspect, the embodiments of the present application provide a wind power sending system, comprising: a wind turbine generator, the wind turbine generator comprising a grid-side converter; a collection transformer, an AC end of the grid-side converter of each wind turbine generator being connected to one end of the collection transformer through a collection circuit, the other end of the collection transformer being configured to be connected to a power grid; and the wind power non-full-phase condition detection system of the first aspect.

[0021] In a fourth aspect, the embodiments of the present application provide a controller, comprising: a processor and a memory storing computer program instructions; and the processor executes the computer program instructions to implement the wind power non-full-phase condition detection method of the second aspect.

[0022] In a fifth aspect, the embodiments of the present application provide a computer readable storage medium, the computer readable storage medium storing computer program instructions, and the computer program instructions are executed by a processor to implement the wind power non-full-phase condition detection method of the second aspect.

[0023] The embodiments of the present application provide a wind power non-full-phase condition detection method, device, controller, system and medium, according to the three-phase voltage of the AC end of the grid-side converter of the wind turbine generator in the wind farm and the three-phase current of the end connected to the power grid of the collection transformer connected to the power grid, the effective current extreme value of the three-phase current and the effective voltage extreme value of the three-phase voltage are obtained, based on the comparison between the effective current extreme value of the three-phase current, the effective voltage extreme value of the three-phase voltage and the full-phase running current range and the full-phase running voltage range, it is determined whether the three-phase voltage and the three-phase current simultaneously appear abnormal in the non-full-phase condition, if the three-phase voltage and the three-phase current simultaneously appear abnormal in the non-full-phase condition, it is determined that the wind power sending system is in the non-full-phase condition, and a first detection result is output, so that the non-full-phase condition of the wind power sending system can be found in time, so that corresponding control measures can be taken in time, and the safety of the wind power sending system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments of the present application will be briefly introduced below, and other drawings can also be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.

[0025] Figure 1 The structure schematic diagram of an example of the wind power sending system provided by the embodiments of the present application is shown in the figure.

[0026] Figure 2 The structure schematic diagram of the wind power non-full-phase condition detection system provided by the embodiments of the present application is shown in the figure.

[0027] Figure 3 The logic schematic diagram of an example of obtaining the effective current extreme value of the three-phase current provided by the embodiments of the present application is shown in the figure.

[0028] Figure 4 A logic diagram of an example of obtaining the effective voltage extreme value of the three-phase voltage provided for an embodiment of the present application;

[0029] Figure 5 A schematic diagram of an example of the determination logic of the non-full-phase working condition of the wind power sending system provided for an embodiment of the present application;

[0030] Figure 6 A flowchart of the detection method of the non-full-phase working condition of the wind power provided for an embodiment of the present application;

[0031] Figure 7 A structural schematic diagram of the controller provided for an embodiment of the present application. DETAILED DESCRIPTION

[0032] The features and exemplary embodiments of various aspects of the present application will be described in detail below, in order to make the purposes, technical solutions and advantages of the present application clearer and more apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. The present application can be implemented without some of these specific details by those skilled in the art. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0033] In the case of a very long distance between the wind farm and the power grid, the impedance of the transmission line between the wind farm and the power grid is large, so that the wind power sending system where the wind turbine generator is located becomes a weak system with low grid strength and weak anti-disturbance capability. In the case of single-phase fault or two-phase fault of the wind power sending system, relay protection will be triggered, and the wind power sending system will be in a non-full-phase working condition. Due to the weak system characteristics of the wind power sending system, such as poor stability and high voltage sensitivity, voltage oscillation, transient overvoltage and other problems are prone to occur, which brings great safety risks to the wind power sending system. The relay for executing the relay protection belongs to the grid side equipment and is controlled by the grid side, so the wind farm side cannot know the turn-off and turn-on of the relay in time, and cannot determine whether the wind power sending system is in a non-full-phase working condition in time. Therefore, there is an urgent need for a method capable of detecting the non-full-phase working condition of the wind power sending system, so as to take relevant measures in time and improve the safety of the wind power sending system.

[0034] This application provides a method, device, controller, system, and medium for detecting wind power non-full-phase operating conditions. It can be applied to wind power transmission systems. By processing the three-phase voltages of the AC terminals of the grid-side converters of the wind turbines in the wind farm, which are synchronously acquired, and the three-phase currents at the grid-connected end of the collecting transformer, it can determine whether the wind power transmission system is in a non-full-phase operating condition by comparing the effective current extreme values ​​of the three-phase currents and the effective voltage extreme values ​​of the three-phase voltages with the full-phase operating current range and the full-phase operating voltage range, respectively. Thus, when the wind power transmission system is in a non-full-phase operating condition, relevant measures can be taken in a timely manner to improve the safety of the wind power transmission system.

[0035] For ease of explanation, a brief introduction to the wind power transmission system in the embodiments of this application will be given first. Figure 1 This is a schematic diagram of an example of a wind power transmission system provided in an embodiment of this application, as shown below. Figure 1 As shown, the wind power transmission system may include a wind turbine generator 11 and a collection transformer 12.

[0036] The wind turbine generator set 11 may include a generator 111, a machine-side converter 112, and a grid-side converter 113. The AC terminal of the machine-side converter 112 is connected to the generator 111, and the DC terminal of the machine-side converter 112 and the grid-side converter 113 can be connected via a DC bus. The AC terminal of the grid-side converter 113 is connected to one end of the collecting transformer 12 via a collector line. It should be noted that the wind farm includes multiple wind turbine generator sets 11, and the grid-side converter 113 of each wind turbine generator set 11 in the wind farm is connected to one end of the collecting transformer 12 via a relay line. The other end of the collecting transformer 12 is configured to be connected to the power grid 13.

[0037] The generator-side converter 112 converts the AC power output from the generator 111 into DC power, which is then transmitted to the grid-side converter 113 via a DC bus. The grid-side converter 113 converts the transmitted DC power back into AC power and transmits it to the collecting transformer 12 via relay lines. The collecting transformer 12 collects and transforms the AC power output from the grid-side converter 113 of the wind turbine generators 11 in the wind farm, and transmits it to the power grid 13.

[0038] In some examples, such as Figure 1 As shown, a filter device 14, a switching device K1, and a switching device K2 may also be installed between the grid-side converter 113 and the collecting transformer 12. The filter device 14 is used for filtering and may include a filter inductor L1 and a filter capacitor C1. The switching device K1 is a switching device on the side closer to the grid-side converter 113, and the switching device K2 is a switching device on the side closer to the collecting transformer 12. A switching device K3 may also be installed between the collecting transformer 12 and the power grid.

[0039] The detection methods, devices, controllers, systems, and media for wind power non-full-phase operating conditions provided in this application are described below.

[0040] The first aspect of this application provides a detection system for wind power non-full-phase operating conditions, which can be applied to wind power transmission systems. For details of the wind power transmission system, please refer to the relevant descriptions in the above embodiments, which will not be repeated here. Figure 2 This is a schematic diagram of the structure of a wind power non-full-phase operating condition detection system provided in an embodiment of this application, as shown below. Figure 2 As shown, the detection system for non-full-phase wind power operation may include a control unit 21 of the grid-side converter, a current sensor 22, a data acquisition device 23 of the power station, and a controller 24.

[0041] The control unit 21 of the grid-side converter is located in the grid-side converter 113 and is configured to collect the three-phase voltage of the AC terminal of the grid-side converter 113. For example, the control unit 21 can collect... Figure 1 The three-phase voltage at point D is the three-phase voltage at the AC terminal of the grid-side converter. Each control unit 21 collects the three-phase voltage at the AC terminal of its corresponding grid-side converter 113.

[0042] The current sensor 22 can be located at the other end of the collector transformer 12, that is, at the end where the collector transformer 12 is connected to the power grid 13. The current sensor 22 is configured to collect the three-phase current at the other end of the collector transformer 12. The three-phase current collected by the current sensor is the three-phase current after the electrical energy output from multiple wind turbines in the wind farm has been collected and stepped up by the collector transformer 12. In some examples, the current sensor 22 can be implemented as a current transformer (CT).

[0043] The station data acquisition device 23 is connected to the current sensor 22 and is configured to acquire the three-phase current collected by the current sensor 22. The station data acquisition device 23 and the current sensor 22 can be connected via an analog signal line, which is used to transmit analog quantities.

[0044] The controller 24 is connected to the station data acquisition device 23 via a first communication line, and can acquire the three-phase current collected by the current sensor 22 from the station data acquisition device 23 via the first communication line. The controller 24 is also connected to the control unit 21 of the grid-side converter 113 via a second communication line, and can acquire the three-phase voltage from the control unit 21 via the second communication line. Figure 2The dotted line in the figure indicates the first communication line and the second communication line. In some examples, in order to improve the data transmission rate, the first communication line and the second communication line can be implemented as optical fiber lines. Since the control unit 21 of the grid-side converter 113 in each wind turbine generator 11 in the wind farm is in communication connection with the controller 24, the second communication line can include an optical fiber ring network line, which is more convenient for the controller 24 to obtain the three-phase voltage at the AC end of the grid-side converter 113 in each wind turbine generator 11.

[0045] The controller 24 is configured to synchronously obtain the three-phase voltage and the three-phase current, obtain the effective current extreme value of the three-phase current and the effective voltage extreme value of the three-phase voltage according to the three-phase current and the three-phase voltage, and output a first detection result in response to the effective current extreme value exceeding a preset full-phase operation current range and the effective voltage extreme value exceeding a preset full-phase operation voltage range, the first detection result indicating that the wind power sending-out system is in a non-full-phase operating condition.

[0046] The synchronous obtaining of the three-phase voltage and the three-phase current by the controller means that the obtained three-phase voltage and three-phase current are three-phase voltage and three-phase current at the same time. The three-phase current can be calculated and processed to obtain three-phase effective current of the three-phase current, and then the effective current extreme value of the three-phase current, which can include the maximum and minimum values in the three-phase effective current. The three-phase voltage can be calculated and processed to obtain three-phase effective voltage of the three-phase voltage, and then the effective voltage extreme value of the three-phase voltage, which can include the maximum and minimum values in the three-phase effective voltage. The full-phase operation current range is the value range of the three-phase effective current at the end connected to the grid of the wind power sending-out system in the full-phase operating condition, which can be obtained by simulating the non-full-phase operating condition and the full-phase operating condition of the wind power sending-out system in advance. Specifically, the simulation can be performed under different power scenarios and different circuit breaker position scenarios, and the data obtained by the simulation is used to set the full-phase operation current range. The full-phase operation voltage range is the value range of the three-phase effective voltage at the AC end of the grid-side converter of the wind turbine generator of the wind power sending-out system in the full-phase operating condition, which can be obtained by simulating the non-full-phase operating condition and the full-phase operating condition of the wind power sending-out system in advance. Specifically, the simulation can be performed under different power scenarios and different circuit breaker position scenarios, and the data obtained by the simulation is used to set the full-phase operation voltage range. If the effective current extreme value exceeds the full-phase operation current range and the effective voltage extreme value exceeds the full-phase operation voltage range at the same time, it indicates that the three-phase current and the three-phase voltage simultaneously appear abnormal in the non-full-phase operating condition, and then it can be determined that the wind power sending-out system is in the non-full-phase operating condition, and the first detection result is output to prompt the staff that the wind power sending-out system is in the non-full-phase operating condition, and relevant control measures need to be taken in time to suppress voltage oscillation, transient overvoltage and other phenomena, and reduce the safety risk of the wind power sending-out system.

[0047] In some examples, the controller can include a field-level controller of the wind farm. The field-level controller of the wind farm performs detection of whether the wind power sending-out system is in the non-full-phase operating condition, can determine wind turbines affected by the non-full-phase operating condition in the entire wind farm, can respectively issue corresponding control measures for each wind turbine, or can determine a total control measure according to a proportion of wind turbines affected by the non-full-phase operating condition in the wind farm, and issue the total control measure for all wind turbines in the wind farm, thereby reducing the safety risk of the wind power sending-out system. This detection method is more suitable for a scenario of controlling the entire wind farm.

[0048] In some examples, the controller can include a main controller of the wind turbine. The main controller of each wind turbine performs detection of whether the wind power sending-out system is in the non-full-phase operating condition, can determine whether the wind turbine where the main controller is located is affected by the non-full-phase operating condition, and if the wind turbine where the main controller is located is affected by the non-full-phase operating condition, controls the wind turbine where the main controller is located, thereby reducing the safety risk of the wind power sending-out system. This detection method is more suitable for a scenario of controlling a single wind turbine.

[0049] In the embodiments of the present application, the controller obtains an effective current extreme value of three-phase current and an effective voltage extreme value of three-phase voltage according to the three-phase voltage of the grid-side converter of the wind turbine in the wind farm and the three-phase current of one end of the collection transformer connected with the grid, which are synchronously acquired, and determines whether the three-phase voltage and the three-phase current simultaneously appear abnormality in the non-full-phase operating condition based on comparison of the effective current extreme value of the three-phase current, the effective voltage extreme value of the three-phase voltage, and the full-phase operating current range and the full-phase operating voltage range, respectively, and if the three-phase voltage and the three-phase current simultaneously appear abnormality in the non-full-phase operating condition, it is determined that the wind power sending-out system is in the non-full-phase operating condition, and a first detection result is output, thereby discovering the non-full-phase operating condition of the wind power sending-out system in time so that corresponding control measures can be taken in time and the safety of the wind power sending-out system is improved.

[0050] In some embodiments, the controller 24 can be specifically configured to: obtain three-phase effective current of three-phase current according to the three-phase current, and determine a maximum value and a minimum value in the three-phase effective current as an effective current extreme value of the three-phase current; and obtain three-phase effective voltage of three-phase voltage according to the three-phase voltage, and determine a maximum value and a minimum value in the three-phase effective voltage as an effective voltage extreme value of the three-phase voltage.

[0051] Three-phase current includes the first-phase current, the second-phase current, and the third-phase current. The effective current of each of the three phases can be calculated separately, i.e., the three-phase effective current. The first-phase effective current can be calculated using the root mean square (RMS) method, as can the second-phase and third-phase effective currents. By comparing the magnitudes of the three-phase effective currents, the maximum and minimum values ​​are determined as the effective current extrema of the three-phase current; that is, the effective current extrema include the maximum and minimum effective current values.

[0052] For example, Figure 3 A logic diagram illustrating an example of obtaining the effective current extreme values ​​of three-phase currents provided in this application embodiment, as shown below. Figure 3 As shown, the first phase current I a After fast root mean square (RMS) calculation, the effective current I of the first phase is obtained. a_Rms Second phase current I b After fast root mean square (RMS) calculation, the effective current I of the second phase is obtained. b_Rms Third phase current I c After fast root mean square (RMS) calculation, the effective current I of the third phase is obtained. c_Rms For the effective current I of the first phase a_Rms Second phase effective current I b_Rms and the third phase effective current I c_Rms Perform the maximum value operation (i.e.) Figure 3 The Max operation in the middle obtains the effective current maximum value I of the three-phase current. Rms_max For the effective current I of the first phase a_Rms Second phase effective current I b_Rms and the third phase effective current I c_Rms Perform the minimum value operation (i.e.) Figure 3 The Min operation in the middle obtains the minimum effective current I of the three-phase current. Rms_min .

[0053] Three-phase voltage includes the first-phase voltage, the second-phase voltage, and the third-phase voltage. The effective voltages of each phase (i.e., the three-phase effective voltages) can be calculated separately. The effective voltage of the first phase can be calculated using the root mean square (RMS) method, as can the effective voltage of the second and third phases. By comparing the magnitudes of the three-phase effective voltages, the maximum and minimum values ​​are determined as the effective voltage extremes of the three-phase voltages; that is, the effective voltage extremes include the maximum and minimum effective voltage values.

[0054] For example, Figure 4 A logic diagram illustrating an example of obtaining the effective voltage extreme values ​​of three-phase voltages provided in this application embodiment, as shown below. Figure 4 As shown, the first phase voltage U a After fast root mean square (RMS) calculation, the effective voltage U of the first phase is obtained. a_Rms Second phase voltage U b After fast root mean square (RMS) calculation, the effective voltage U of the second phase is obtained. b_Rms Third phase voltage U c After fast root mean square (RMS) calculation, the effective voltage U of the third phase is obtained. c_Rms For the effective voltage U of the first phase a_Rms The second phase effective voltage U b_Rms and the third phase effective voltage U c_Rms Perform the maximum value operation (i.e.) Figure 4 The Max operation in the process yields the maximum effective voltage U of the three-phase voltage. Rms_max For the effective voltage U of the first phase a_Rms The second phase effective voltage U b_Rms and the third phase effective voltage U c_Rms Perform the minimum value operation (i.e.) Figure 4 The Min operation in the middle obtains the minimum effective voltage U of the three-phase voltage. Rms_Min .

[0055] In the above embodiments, the effective current extreme value exceeding the full-phase operation current range can specifically include: the effective current maximum value being greater than the upper limit value of the full-phase operation current range, and the effective current minimum value being less than the lower limit value of the full-phase operation current range. That is, the effective current maximum value being greater than the upper limit value of the full-phase operation current range and the effective current minimum value being less than the lower limit value of the full-phase operation current range occur simultaneously, and it is considered that the effective current extreme value exceeds the full-phase operation current range. If the effective current maximum value is greater than the upper limit value of the full-phase operation current range, and the effective current minimum value is greater than or equal to the lower limit value of the full-phase operation current range, the effective current extreme value is still within the full-phase operation current range; similarly, if the effective current maximum value is less than or equal to the upper limit value of the full-phase operation current range, and the effective current minimum value is less than the lower limit value of the full-phase operation current range, the effective current extreme value is still within the full-phase operation current range.

[0056] In the above embodiments, the effective voltage extreme value exceeding the full-phase operation voltage range can specifically include: the effective voltage maximum value being greater than the upper limit value of the full-phase operation voltage range, and the effective voltage minimum value being less than the lower limit value of the full-phase operation voltage range. In the case of the non-full-phase operating condition of the wind power sending-out system, the current and voltage corresponding to the disconnected one-phase line or two-phase line are extremely small due to the disconnection, and are less than the lower limit value of the full-phase operation current range and the lower limit value of the full-phase operation voltage range; the current and voltage corresponding to the non-disconnected one-phase line or two-phase line are increased due to the current imbalance and voltage imbalance caused by the disconnected line, and are greater than the upper limit value of the full-phase operation current range and the upper limit value of the full-phase operation voltage range. That is, the effective voltage maximum value being greater than the upper limit value of the full-phase operation voltage range and the effective voltage minimum value being less than the lower limit value of the full-phase operation voltage range occur simultaneously, and it is considered that the effective voltage extreme value exceeds the full-phase operation voltage range. If the effective voltage maximum value is greater than the upper limit value of the full-phase operation voltage range, and the effective voltage minimum value is greater than or equal to the lower limit value of the full-phase operation voltage range, the effective voltage extreme value is still within the full-phase operation voltage range; similarly, if the effective voltage maximum value is less than or equal to the upper limit value of the full-phase operation voltage range, and the effective voltage minimum value is less than the lower limit value of the full-phase operation voltage range, the effective voltage extreme value is still within the full-phase operation voltage range.

[0057] In summary, in the case of the effective current maximum value being greater than the upper limit value of the full-phase operation current range, the effective current minimum value being less than the lower limit value of the full-phase operation current range, the effective voltage maximum value being greater than the upper limit value of the full-phase operation voltage range, and the effective voltage minimum value being less than the lower limit value of the full-phase operation voltage range all being met, it is determined that the wind power sending-out system is in the non-full-phase operating condition.

[0058] For example, Figure 5 A schematic diagram of an example of the determination logic of the wind power sending-out system in the non-full-phase operating condition provided by the embodiments of the present application is shown in FIG. 1.Figure 5 the effective current maximum value I Rms_max the determination of whether the effective current minimum value I Rms_min the determination of whether the effective voltage maximum value U Rms_max the determination of whether the effective voltage minimum value U Rms_Min the determination of whether the threshold 4, wherein the threshold 1 is an upper limit value of the full-phase operation current range, the threshold 2 is a lower limit value of the full-phase operation current range, the threshold 3 is an upper limit value of the full-phase operation voltage range, and the threshold 4 is a lower limit value of the full-phase operation voltage range. The determination of whether the effective current maximum value I Rms_max the determination of whether the threshold 1 and the effective current minimum value I Rms_min the determination of whether the threshold 2 and the effective voltage maximum value U Rms_max the determination of whether the threshold 3 and the effective voltage minimum value U Rms_Min the determination of whether the threshold 4 and the determination of whether the threshold 4 are subjected to AND operation to obtain an AND operation result 2. The AND operation result 1 and the AND operation result 2 are subjected to AND operation to obtain an AND operation result 3. If the AND operation result 3 is “yes”, it is determined that the wind power sending system is in the non-full-phase operation condition. The AND operation is a kind of logical operation operation, two inputs can obtain an output through AND operation, only when the two inputs are both “yes”, the output obtained is “yes”, if at least one of the two inputs is “no”, the output obtained is “no”.

[0059] In some examples, the controller 24 can also be configured to: in response to the effective current extreme value being located in the full-phase operation current range and / or the effective voltage extreme value being located in the full-phase operation voltage range, output a second detection result, the second detection result representing that the wind power sending system is not in the non-full-phase operation condition.

[0060] At least one of the condition that the effective current extreme value is located in the full-phase operation current range and the condition that the effective voltage extreme value is located in the full-phase operation voltage range is satisfied, that is, the wind power sending system is determined to be not in the non-full-phase operation condition, and the second detection result is output.

[0061] In some embodiments, the controller 24 is further specifically configured to: in response to the effective current extreme value exceeding the full-phase operation current range and the effective voltage extreme value corresponding to at least one wind turbine exceeding the full-phase operation voltage range, output the first detection result. That is, in the case that the effective current extreme value exceeds the full-phase operation current range, if the effective voltage extreme value of more than one wind turbine in the wind farm exceeds the full-phase operation voltage range, it is considered that the wind power sending system is in the non-full-phase operation condition, and corresponding control measures can be taken in time, for example, the wind turbine whose effective voltage extreme value exceeds the full-phase operation voltage range is controlled and adjusted to suppress problems such as voltage oscillation and transient overvoltage.

[0062] The second aspect of the present application provides a detection method for a non-full-phase working condition of wind power, which can be applied to a wind power sending system. The specific content of the wind power sending system can be referred to the related description in the above embodiments, which will not be repeated here. The detection method for the non-full-phase working condition of wind power can be executed by the controller in the above embodiments. Figure 6 The flowchart of the detection method for the non-full-phase working condition of wind power provided by an embodiment of the present application is shown in FIG. 3. The detection method for the non-full-phase working condition of wind power can include steps S301 to S303. Figure 6

[0063] In step S301, the three-phase current at the other end of the collection transformer and the three-phase voltage at the AC end of the grid-side converter are synchronously acquired.

[0064] In step S302, the effective current extreme value of the three-phase current and the effective voltage extreme value of the three-phase voltage are respectively obtained according to the three-phase current and the three-phase voltage.

[0065] In step S303, a first detection result is output in response to the effective current extreme value exceeding the preset full-phase running current range and the effective voltage extreme value exceeding the preset full-phase running voltage range.

[0066] The first detection result indicates that the wind power sending system is in a non-full-phase working condition.

[0067] The related content in steps S301 to S303 can be referred to the related description in the above embodiments, which will not be repeated here.

[0068] In the embodiments of the present application, the effective current extreme value of the three-phase current and the effective voltage extreme value of the three-phase voltage can be obtained according to the synchronously acquired three-phase voltage at the AC end of the grid-side converter of the wind turbine generator in the wind farm and the three-phase current at the one end of the collection transformer connected with the power grid. Based on the comparison between the effective current extreme value of the three-phase current, the effective voltage extreme value of the three-phase voltage and the full-phase running current range and the full-phase running voltage range respectively, it is determined whether the three-phase voltage and the three-phase current simultaneously appear abnormality in the non-full-phase working condition. If the three-phase voltage and the three-phase current simultaneously appear abnormality in the non-full-phase working condition, it is determined that the wind power sending system is in a non-full-phase working condition, and the first detection result is output. Thus, the non-full-phase working condition of the wind power sending system can be found in time, so that the corresponding control measures can be taken in time, and the safety of the wind power sending system is improved.

[0069] In some embodiments, step S302 can be specifically refined as follows: the three-phase effective current of the three-phase current is obtained according to the three-phase current, and the maximum value and the minimum value in the three-phase effective current are determined as the effective current extreme value of the three-phase current; the three-phase effective voltage of the three-phase voltage is obtained according to the three-phase voltage, and the maximum value and the minimum value in the three-phase effective voltage are determined as the effective voltage extreme value of the three-phase voltage. ​

[0070] In some embodiments, the effective current extreme value exceeding the preset full-phase operation current range in the above-mentioned embodiments includes: the effective current maximum value is greater than the upper limit value of the full-phase operation current range, and the effective current minimum value is less than the lower limit value of the full-phase operation current range.

[0071] The effective voltage extreme value exceeding the preset full-phase operation voltage range in the above-mentioned embodiments includes: the effective voltage maximum value is greater than the upper limit value of the full-phase operation voltage range, and the effective voltage minimum value is less than the lower limit value of the full-phase operation voltage range.

[0072] In some embodiments, the wind power non-full-phase operation condition detection method can further include: in response to the effective current extreme value being within the full-phase operation current range and / or the effective voltage extreme value being within the full-phase operation voltage range, outputting a second detection result. The second detection result represents that the wind power sending-out system is not in a non-full-phase operation condition.

[0073] In some examples, the step S303 can be specifically refined as: in response to the effective current extreme value exceeding the full-phase operation current range and the effective voltage extreme value corresponding to at least one wind turbine exceeding the full-phase operation voltage range, outputting a first detection result.

[0074] The specific content of the wind power non-full-phase operation condition detection method in the embodiments of the present application can be referred to the related description in the above-mentioned embodiments, which will not be repeated here.

[0075] The third aspect of the present application provides a wind power sending-out system. The wind power sending-out system includes a wind turbine, a collection transformer and a wind power non-full-phase operation condition detection system. The specific content of the wind turbine, the collection transformer and the wind power non-full-phase operation condition detection system can be referred to the related description in the above-mentioned embodiments, and the same technical effects can be achieved. To avoid repetition, they will not be repeated here.

[0076] The fourth aspect of the present application provides a controller. Figure 7 The structure diagram of the controller provided by an embodiment of the present application is shown in FIG. 4, which includes a memory 401, a processor 402 and a computer program stored in the memory 401 and executable on the processor 402. Figure 7 As shown in FIG. 4, the controller 400 includes a memory 401, a processor 402 and a computer program stored in the memory 401 and executable on the processor 402.

[0077] In some examples, the processor 402 can include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or can be configured as one or more integrated circuits implementing the embodiments of the present application.

[0078] The memory 401 can include a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Therefore, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method for detecting a non-full-load operating condition of a wind power generator according to the embodiments of the present application.

[0079] The processor 402 runs a computer program corresponding to the executable program code stored in the memory 401 by reading the executable program code, for implementing the method for detecting a non-full-load operating condition of a wind power generator in the above-described embodiments.

[0080] In some examples, the controller 400 can further include a communication interface 403 and a bus 404. As shown, the memory 401, the processor 402, and the communication interface 403 are connected through the bus 404 and complete communication among each other. Figure 7

[0081] The communication interface 403 is mainly used to implement the communication among the modules, devices, units, and / or equipment in the embodiments of the present application. The input device and / or the output device can also be accessed through the communication interface 403.

[0082] ​Bus 404 includes hardware, software, or both, to couple components of controller 400 to each other in communication. While the specific bus 404 is described in this embodiment, other buses, including communication buses, interfaces, or fabric, can be used in other embodiments. For example, but not limited to, the bus 404 can include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-E) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or another suitable bus or combination of two or more of these. Where appropriate, bus 404 can include one or more buses. Although this embodiment describes and shows a particular bus, this application contemplates any suitable bus or interconnect.

[0083] The fifth aspect of the present application further provides a computer readable storage medium, which stores computer program instructions, and the computer program instructions are executed by a processor to implement the wind power non-full-phase condition detection method in the above embodiments and achieve the same technical effects. To avoid repetition, details are not described here. The computer readable storage medium can include a non-transitory computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, etc., which is not limited here.

[0084] The embodiments of the present application can provide a computer program product, which includes a computer program, and the computer program is executed by a processor to implement the wind power non-full-phase condition detection method in the above embodiments and achieve the same technical effects. To avoid repetition, details are not described here.

[0085] It should be noted that each of the above-described examples can be cast in the progressive form, and the same or similar parts among the examples can be cross-referenced. Each of the examples focuses on the differences from other examples. For the method example, the wind power transmission system example, the controller example, the computer readable storage medium example, and the computer program product example, the relevant parts can be cross-referenced with the description of the detection system example. The present application is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art can make various changes, modifications and additions, or change the order of the steps, after understanding the spirit of the present application. Also, detailed descriptions of known methods and techniques are omitted here for the sake of brevity.

[0086] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. Alternatively, computer program implemented process can be produced by compiling a computer program instruction into one or more modules of a computer program, which implement one or more functions specified in the flowchart and / or block diagram block or blocks.

[0087] Those skilled in the art should understand that the above-described examples are exemplary but not limiting. Different technical features appearing in different examples can be combined to achieve beneficial effects. Those skilled in the art should understand and implement other changed examples of the disclosed examples based on the drawings, the specification and the claims. In the claims, the term "comprising" does not exclude other devices or steps; the quantifier "one" does not exclude a plurality; the terms "first", "second" are used to distinguish names and not to indicate any particular order. Any reference signs in the claims should not be understood as limiting the scope of protection. The functions of multiple parts appearing in the claims can be implemented by a single hardware or software module. The fact that certain technical features appear in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A wind power non-full-phase condition detection system, characterized in that, The application is applied to a wind power sending system, the wind power sending system comprises wind power generators and a collection transformer, the wind power generators comprise grid-side converters, and the AC end of the grid-side converter of each wind power generator is connected with one end of the collection transformer through a power collection line, and the other end of the collection transformer is configured to be connected with a power grid; The system comprises: a control unit of the grid-side converter, configured to collect three-phase voltages of the AC end of the grid-side converter; a current sensor arranged at the other end of the collection transformer and configured to collect three-phase currents of the other end of the collection transformer; a plant data acquisition device connected with the current sensor and configured to acquire the three-phase currents from the current sensor; a controller connected with the plant data acquisition device through a first communication line and connected with the control unit of the grid-side converter through a second communication line, configured to synchronously acquire the three-phase currents and the three-phase voltages, obtain effective current extreme values of the three-phase currents and effective voltage extreme values of the three-phase voltages respectively according to the three-phase currents and the three-phase voltages, and output a first detection result in response to the effective current extreme values exceeding a preset full-phase operation current range and the effective voltage extreme values exceeding a preset full-phase operation voltage range, the first detection result representing that the wind power sending system is in a non-full-phase working condition.

2. The system of claim 1, wherein, The controller is specifically configured to: obtain three-phase effective currents of the three-phase currents according to the three-phase currents, and determine the maximum value and the minimum value in the three-phase effective currents as the effective current extreme values of the three-phase currents; obtain three-phase effective voltages of the three-phase voltages according to the three-phase voltages, and determine the maximum value and the minimum value in the three-phase effective voltages as the effective voltage extreme values of the three-phase voltages.

3. The system according to claim 1, wherein the effective current extreme values exceeding the preset full-phase operation current range comprises that the maximum value of the effective currents is greater than the upper limit value of the full-phase operation current range and the minimum value of the effective currents is less than the lower limit value of the full-phase operation current range; the effective voltage extreme values exceeding the preset full-phase operation voltage range comprises that the maximum value of the effective voltages is greater than the upper limit value of the full-phase operation voltage range and the minimum value of the effective voltages is less than the lower limit value of the full-phase operation voltage range.

4. The system of claim 1, wherein, The controller is further configured to: output a second detection result in response to the effective current extreme values being located in the full-phase operation current range and / or the effective voltage extreme values being located in the full-phase operation voltage range, the second detection result representing that the wind power sending system is not in the non-full-phase working condition.

5. The system of claim 1, wherein, The controller is specifically configured to: output the first detection result in response to the effective current extreme values exceeding the full-phase operation current range and the effective voltage extreme values corresponding to at least one wind power generator exceeding the full-phase operation voltage range.

6. The system according to claim 1, wherein the second communication line comprises a fiber ring network line; the controller comprises a plant-level controller of a wind power plant or a main controller of a wind power generator.

7. A method for detecting a non-full-phase condition of a wind turbine, characterized in that The application is applied to a wind power sending system, the wind power sending system comprises wind power generators and a collection transformer, each wind power generator comprises a grid-side converter, the AC end of the grid-side converter of each wind power generator is connected to one end of the collection transformer through a power collection line, and the other end of the collection transformer is configured to be connected to a power grid; The method comprises: synchronously acquiring three-phase currents of the other end of the collection transformer and three-phase voltages of the AC end of the grid-side converter; according to the three-phase currents and the three-phase voltages, obtaining effective current extreme values of the three-phase currents and effective voltage extreme values of the three-phase voltages respectively; in response to the effective current extreme values exceeding a preset full-phase operation current range and the effective voltage extreme values exceeding a preset full-phase operation voltage range, outputting a first detection result, the first detection result representing that the wind power sending system is in a non-full-phase working condition.

8. The method of claim 7, wherein, The method comprises: according to the three-phase currents, obtaining three-phase effective currents of the three-phase currents, and determining the maximum value and the minimum value in the three-phase effective currents as the effective current extreme values of the three-phase currents; according to the three-phase voltages, obtaining three-phase effective voltages of the three-phase voltages, and determining the maximum value and the minimum value in the three-phase effective voltages as the effective voltage extreme values of the three-phase voltages.

9. The method according to claim 7, wherein the effective current extreme values exceeding the preset full-phase operation current range comprises that the maximum effective current value is greater than the upper limit value of the full-phase operation current range and the minimum effective current value is less than the lower limit value of the full-phase operation current range; the effective voltage extreme values exceeding the preset full-phase operation voltage range comprises that the maximum effective voltage value is greater than the upper limit value of the full-phase operation voltage range and the minimum effective voltage value is less than the lower limit value of the full-phase operation voltage range.

10. The method of claim 7, wherein, The method further comprises: in response to the effective current extreme values being within the full-phase operation current range and / or the effective voltage extreme values being within the full-phase operation voltage range, outputting a second detection result, the second detection result representing that the wind power sending system is not in the non-full-phase working condition.

11. The method of claim 7, wherein, The method comprises: in response to the effective current extreme values exceeding the preset full-phase operation current range and the effective voltage extreme values exceeding the preset full-phase operation voltage range, outputting the first detection result.

12. A wind power transmission system characterized by, The method comprises: a wind power generator, the wind power generator comprising a grid-side converter; a collection transformer, the AC end of the grid-side converter of each wind power generator being connected to one end of the collection transformer through a power collection line, and the other end of the collection transformer being configured to be connected to a power grid; The wind power non-full-phase working condition detection system according to any one of claims 1 to 6.

13. A controller characterized by comprising: The system comprises: a processor and a memory storing computer program instructions. The processor implements the wind power non-full-phase condition detection method in any one of claims 7 to 11 when executing the computer program instructions.

14. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer program instructions, and the computer program instructions are executed by the processor to implement the wind power non-full-phase condition detection method in any one of claims 7 to 11.

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