An uninterruptible power supply system

Abstract

The present invention discloses an uninterruptible power supply system, which is applied to the field of wind turbine equipment. The system includes: an uninterruptible power supply, a current transmitter and a controller; the uninterruptible power supply is used to output multiple paths of adjustable alternating current, and control the output power of each output line based on the received regulation instruction. The uninterruptible power supply is communicatively connected to the controller; the current transmitter is used to collect the current data of the multiple paths of adjustable alternating current, and the current transmitter is communicatively connected to the controller; the controller is used to generate a regulation instruction through an output capacity control method based on the uninterruptible power supply data of the received uninterruptible power supply and the current data of the current transmitter, and send the regulation instruction to the uninterruptible power supply. By the controller receiving the data collected by the uninterruptible power supply and the current transmitter to generate a regulation instruction, the real-time regulation of the output power based on the load is realized, the situation of resource waste or inability to meet the power demand of the load is avoided, and the safe and stable operation of the equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of wind turbine equipment, and particularly to an uninterruptible power supply system. Background Art

[0002] During the operation of a wind turbine, sudden situations such as power grid failures and lightning strikes may cause the power supply to be interrupted, thus affecting the normal operation of the wind turbine. In offshore wind power projects, where a higher requirement for power supply stability exists, wind turbines are generally equipped with an uninterruptible power supply to supply power to the equipment. Since the output capacity of the UPS is often fixed, and the offshore environment is changeable with large variations in equipment load, the prior art cannot perform intelligent dynamic adjustment based on the actual load of the equipment, resulting in resource waste or an inability to meet the power demand of the load in certain special cases, and unable to ensure the safe and stable operation of the equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide an uninterruptible power supply system, which is applied to the field of wind turbine equipment. The system receives data collected by the uninterruptible power supply and the current transducer through a controller, and then generates a control command for regulating the output power, realizing real-time regulation of the output power based on the load, avoiding resource waste or the situation of being unable to meet the power demand of the load, and ensuring the safe and stable operation of the equipment.

[0004] To solve the above technical problems, the present invention provides an uninterruptible power supply system, including: an uninterruptible power supply, a current transducer, and a controller;

[0005] The uninterruptible power supply is used to output multiple paths of adjustable alternating current; control the output power of each output line based on the received control command; the uninterruptible power supply is communicatively connected to the controller;

[0006] The current transducer is used to collect the current data of the multiple paths of adjustable alternating current; the current transducer is communicatively connected to the controller;

[0007] The controller is used to generate a control command through an output capacity control method based on the received uninterruptible power supply data of the uninterruptible power supply and the current data of the current transducer, and send the control command to the uninterruptible power supply.

[0008] Optionally, the generating a control command through an output capacity control method based on the received uninterruptible power supply data of the uninterruptible power supply and the current data of the current transducer includes:

[0009] Receiving the uninterruptible power supply data of the uninterruptible power supply and the current data of the current transducer;

[0010] Perform data cleaning and data balancing on the historical current data, and construct a regression model for each output line;

[0011] Determine the model parameters of the regression model based on the historical current data and the uninterruptible power supply data of each output line;

[0012] Input the real-time current data into the regression model to obtain the predicted output power of each output line;

[0013] If it is determined that the line is underloaded based on the predicted output power, generate an underload regulation instruction for the output line;

[0014] If it is determined that the line is overloaded based on the predicted output power, generate an overload regulation instruction for the output line.

[0015] Optionally, the regression model is a multiple linear regression model; the expression of the multiple linear regression model is:

[0016] ;

[0017] In the formula, is the output power of the output line in the uninterruptible power supply data, is the current data of the output line, is the ambient temperature in the uninterruptible power supply data, i is the data time point, is the first model parameter, is the second model parameter, is the third model parameter.

[0018] Optionally, the line underload means that the output power of the output line decreases by 60% within 30S; the line overload is any combination of the current line output power increasing by 10% within 10s, the total output line output power exceeding 125% of the rated load for 5min, and the total output line output power exceeding 150% of the rated load for 30s.

[0019] Optionally, the controller is a PLC controller;

[0020] The uninterruptible power supply is connected to the PLC controller through RS458 to construct a first communication link;

[0021] The uninterruptible power supply is connected to the digital input / output module of the PLC controller through dry contacts to construct a second communication link;

[0022] The current transmitter is connected to the analog input module of the PLC controller to construct a third communication link;

[0023] The first communication link is used to transmit the main path related signals, bypass related signals, output related signals, battery related signals and load related signals of each path of the uninterruptible power supply;

[0024] The second communication link is used to transmit the UPS inverter OK feedback signal, UPS protection shutdown signal and the signal for notifying the UPS unit and performing off-network manual debugging of the uninterruptible power supply;

[0025] The third communication link is used to transmit the current data collected by the current transmitter.

[0026] Optionally, the multi-way adjustable alternating current is four-way adjustable alternating current;

[0027] The first output circuit is connected to the input end of the medium voltage switch cabinet of the wind turbine generator set; the first-way adjustable alternating current output by the first output circuit is used for remote control, remote signaling and remote measurement of the medium voltage switch cabinet system;

[0028] The second output circuit is connected to the input end of the high voltage switch cabinet of the wind turbine generator set; the second-way adjustable alternating current output by the second output circuit is used for remote control, remote signaling and remote measurement of the high voltage switch cabinet system;

[0029] The third output circuit is connected to the input end of the converter integrated cabinet of the wind turbine generator set, and the third-way adjustable alternating current output by the third output circuit is used for equipment power supply of the converter integrated cabinet;

[0030] The fourth output circuit is connected to the input end of the nacelle main control cabinet of the wind turbine generator set, and the fourth-way adjustable alternating current output by the fourth output circuit is used for equipment power supply of the nacelle main control cabinet.

[0031] Optionally, the system further includes: a SCADA system;

[0032] The controller performs data interaction with the server database through a switch, and displays the uninterruptible power supply data of the uninterruptible power supply, the current data of the current transmitter and the operation processing data of the output capacity control method in the server database in real time through the interface of the SCADA system of the step-up substation.

[0033] Optionally, the uninterruptible power supply further includes:

[0034] A temperature compensation module, configured to collect the ambient temperature of the uninterruptible power supply; when the ambient temperature is higher than the center point temperature, the charging voltage is reduced when charging the battery; when the ambient temperature is lower than the center point temperature, the charging voltage is increased when charging the battery.

[0035] Optionally, the uninterruptible power supply is used to output 230V multi-way adjustable alternating current;

[0036] The high-voltage electricity of the power grid is stepped down through an oil-type transformer, a dry-type transformer, and a converter measuring transformer connected in sequence to a voltage of 400V; one phase wire and one neutral wire are selected from the 400V voltage circuit and connected to the input end of the uninterruptible power supply.

[0037] Optionally, the controller further includes:

[0038] An HMI interface for displaying the uninterruptible power supply data of the uninterruptible power supply stored in the local database, the current data of the current transmitter, and the operation processing data of the output capacity control method.

[0039] The present invention discloses an uninterruptible power supply system, including: an uninterruptible power supply, a current transmitter, and a controller; the uninterruptible power supply is used to output multiple paths of adjustable alternating current, and control the output power of each output line based on the received regulation instruction; the uninterruptible power supply is communicatively connected to the controller; the current transmitter is used to collect the current data of the multiple paths of adjustable alternating current; the current transmitter is communicatively connected to the controller; the controller is used to generate a regulation instruction through an output capacity control method based on the received uninterruptible power supply data of the uninterruptible power supply and the current data of the current transmitter, and send the regulation instruction to the uninterruptible power supply. By the controller receiving the data collected by the uninterruptible power supply and the current transmitter to generate a regulation instruction, the real-time regulation of the output power based on the load is realized, avoiding the situation of resource waste or the inability to meet the power demand of the load, and ensuring the safe and stable operation of the equipment. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0041] Figure 1 It is a schematic diagram of the architecture of an uninterruptible power supply system provided by an embodiment of the present invention;

[0042] Figure 2 It is an example diagram of the architecture of an uninterruptible power supply provided by an embodiment of the present invention;

[0043] Figure 3 It is a circuit diagram of an uninterruptible power supply system provided by an embodiment of the present invention.

[0044] Reference numerals: 01 - Uninterruptible power supply; 02 - Current transmitter; 03 - Controller; 04 - Medium - voltage integrated cabinet; 05 - High - voltage integrated cabinet; 06 - Converter integrated cabinet; 07 - Main control cabinet in nacelle; 08 - Bypass AC input; 09 - Rectifier AC input; 10 - Rectifier; 11 - Inverter; 12 - Static switch; 13 - Charger / discharging device; 14 - Battery; 15 - AC output. Detailed implementation manners

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] With the increasing proportion of wind power generation in the global energy structure, the reliability and stability of wind turbines have become crucial. During the operation of wind turbines, sudden situations such as grid faults and lightning strikes may cause power supply interruptions, thus affecting the normal operation of wind turbines. In recent years, owners have put forward higher requirements for the endurance of uninterruptible power supplies. Especially in offshore projects, owners generally require that the endurance time of the uninterruptible power supply (UPS, Uninterruptible Power Supply) is 2 hours. At present, the UPS system mainly consists of three parts: converter UPS, tower - base UPS, and nacelle UPS. Adding a battery pack inside affects the volume and layout of the existing converter integrated cabinet and main control cabinet in nacelle; adding a battery pack outside not only affects the aesthetics but also requires a separate cabinet that meets the requirements of the offshore environment, greatly increasing the cost.

[0047] At the same time, the above - mentioned UPS is usually a standardized product adopting a high - frequency technical route, which has disadvantages in terms of reliability compared with the power - frequency technical route; currently, it is also very rare for a single UPS to centrally supply power and centrally perform dynamic scheduling control on all equipment of the wind turbine below 230V.

[0048] In addition, the output capacity of the UPS is often fixed and cannot be intelligently and dynamically adjusted according to the actual load, which leads to resource waste or inability to meet the power demand of the load in some special cases; and the monitoring of the UPS output is not comprehensive and accurate enough, making it difficult to achieve precise control and optimized operation of the UPS system.

[0049] Therefore, the present invention provides an uninterruptible power supply system for wind turbine equipment. By using a single multi-output UPS to replace the three parts of the converter UPS, tower base UPS, and nacelle UPS of the wind turbine, it is not necessary to additionally modify the volume and layout of the cabinet of the offshore wind turbine. While reducing costs, the battery capacity is expanded, and the output current of the UPS power supply is industrial frequency current, which ensures the stable operation of the equipment. Further, the controller receives the data collected by the uninterruptible power supply and the current transmitter to generate a control command, realizing real-time control of the output power based on the load, avoiding resource waste or the situation of being unable to meet the power demand of the load, and ensuring the safe and stable operation of the equipment.

[0050] The following combines Figure 1 , Figure 1 is a schematic diagram of the architecture of an uninterruptible power supply system provided by an embodiment of the present invention. The uninterruptible power supply system may include: an uninterruptible power supply 01, a current transmitter 02, and a controller 03;

[0051] The uninterruptible power supply 01 can be used to output multiple channels of adjustable alternating current; control the output power of each output line based on the received control command; the uninterruptible power supply 01 is communicatively connected to the controller 03;

[0052] The current transmitter 02 can be used to collect the current data of multiple channels of adjustable alternating current; the current transmitter 02 is communicatively connected to the controller 03;

[0053] The controller 03 can be used to generate a control command through an output capacity control method based on the uninterruptible power supply 01 data of the received uninterruptible power supply 01 and the current data of the current transmitter 02, and send the control command to the uninterruptible power supply 01.

[0054] This embodiment does not limit the number of output circuits of the UPS. Generally, it can be four, that is, the multiple channels of adjustable alternating current are four channels of adjustable alternating current. The four output circuits can be respectively connected to a medium voltage switchgear cabinet 04, a high voltage switchgear cabinet 05, a converter integrated cabinet 06, and a nacelle main control cabinet 07.

[0055] Specifically, the first output circuit is connected to the input end of the medium voltage switchgear cabinet 04 of the wind turbine; the first channel of adjustable alternating current output by the first output circuit is used for remote control, remote signaling, and remote measurement of the medium voltage switchgear system;

[0056] The second output circuit is connected to the input end of the high voltage switchgear cabinet 05 of the wind turbine; the second channel of adjustable alternating current output by the second output circuit is used for remote control, remote signaling, and remote measurement of the high voltage switchgear system;

[0057] The third output circuit is connected to the input end of the converter integrated cabinet 06 of the wind turbine; the third channel of adjustable alternating current output by the third output circuit is used for equipment power supply of the converter integrated cabinet 06;

[0058] The fourth output circuit is connected to the input end of the nacelle main control cabinet 07 of the wind turbine; the fourth adjustable alternating current output by the fourth output circuit is used for power supply to the equipment in the nacelle main control cabinet 07.

[0059] In this embodiment, the uninterruptible power supply 01 can be used to output multi-channel adjustable 230V alternating current; the high-voltage grid power is stepped down to 400V through an oil-type transformer, a dry-type transformer, and a converter measurement transformer connected in sequence; one phase wire and one neutral wire are selected from the 400V voltage circuit and connected to the input end of the uninterruptible power supply 01. After the uninterruptible power supply 01 is powered on, through the full-bridge fully controlled thyristor rectifier circuit of the rectifier, the 230V alternating current is first converted into stable direct current, and then the direct current is converted into 4 channels of pure and stable 230V alternating current with adjustable output power through the IGBT (Insulate-Gate Bipolar Transistor) and pulse width modulation technology of the inverter for output.

[0060] In this embodiment, the full-bridge fully controlled thyristor rectifier circuit has the characteristics of high conversion efficiency and low harmonic distortion. At the same time, the inverter 11 is equipped with an intelligent protection circuit, which can automatically cut off the output in case of abnormal conditions such as overload and short circuit to protect the system safety.

[0061] Furthermore, in this embodiment, the converter integrated cabinet 06 can be provided with 230V equipment such as a switching power supply, a three-way valve of the water cooling system, a lighting system, various fans and heating tapes of the water cooling system, sockets, harmful gas alarm lights, a fire protection system, an air detector, a debugging cabinet, etc.

[0062] In this embodiment, the fourth output circuit can be directly connected from the tower base to the nacelle main control cabinet 07 through a 130-meter power supply cable. After line calculation, the voltage drops about 10V, meeting the power supply requirements of the 230V equipment in the nacelle main control cabinet 07.

[0063] The 230V equipment in the nacelle main control cabinet 07 can include a switching power supply, lightning detection, aviation obstruction lights, harmful gas alarm lights, bird repellers, nacelle control cabinet lighting, an on-line status monitoring system, a gearbox status monitoring system, a safety relay, a three-way valve of the water cooling system, etc.

[0064] The switching power supply in the nacelle main control cabinet 07 can output 24V power to the power supply module of the controller 03 (such as the PLC power supply module), various communication modules, digital input / output modules, analog input / output modules, time relays, switches, video monitoring systems, mechanical anemometers, wind vanes, ultrasonic anemometer and wind vane sensors, rain gauges, generator carbon brushes, various lubricating pumps and brake valves, etc.

[0065] This embodiment does not limit the specific type of the controller 03. Generally, the controller 03 can be a PLC controller (Programmable Logic Controller).

[0066] In this embodiment, the uninterruptible power supply 01 can be connected to the PLC controller 03 through RS458 (a standard for data transmission in industrial environments) to construct a first communication link;

[0067] The uninterruptible power supply 01 can be connected to the digital input / output module of the PLC controller through dry contacts to construct a second communication link;

[0068] The current transmitter 02 can be connected to the analog input module of the PLC controller to construct a third communication link;

[0069] The first communication link can be used to transmit the main circuit related signals, bypass related signals, output related signals, battery related signals and load related signals of each path of the uninterruptible power supply 01;

[0070] The second communication link can be used to transmit the UPS inverter OK feedback signal, UPS protection shutdown signal and the signal to notify the UPS unit and perform off-grid manual debugging of the uninterruptible power supply 01;

[0071] The third communication link can be used to transmit the current data collected by the current transmitter 02.

[0072] This embodiment does not limit the specific manner of generating a regulation instruction through the output capacity control method based on the received uninterruptible power supply 01 data of the uninterruptible power supply 01 and the current data of the current transmitter 02. For a single-phase 230V power supply, the relationship between the UPS output power (capacity) and the current follows the formula P = UIcosφ, where U is the voltage, P is the output power, I is the current, and cosφ is the power factor, and U = 230 ± 1V (the UPS system monitors the output voltage of each path in real time). The power factor cosφ of the industrial frequency UPS is on average 0.8, and the UPS output power P and the current I are basically linearly related. Moreover, the maximum capacity of the load behind each path of output is clear, so the corresponding current range is determined.

[0073] The controller 03 in this embodiment can first receive the uninterruptible power supply 01 data from the uninterruptible power supply 01 and the current data of the current transmitter 02; perform data cleaning and data balancing processing on the historical current data, and construct a regression model for each output line.

[0074] The current data in this embodiment can collect data at a frequency of 10 times per second to obtain sufficient time series data.

[0075] In this embodiment, obvious abnormal data points can be removed through data cleaning. As known before, the output power of each path and the total load of the uninterruptible power supply 01 are both clear. If the current value suddenly appears extremely large or extremely small, beyond the normal working range, it may be caused by measurement errors or momentary interference. These data points are removed through the algorithm.

[0076] In this embodiment, current fluctuations can be eliminated through data balancing, reducing the influence of noise on subsequent analysis. This embodiment can use the moving average method for data balancing. For example, calculate the average value of adjacent m data points (take m = 10, which is 1 second) as the effective current value at the current moment (1 second).

[0077] This embodiment can construct current and time feature engineering: in addition to the original current data, calculate the change rate of the current. For example, calculate the difference in current between adjacent time points ∆I = I t -I (t-1) , where I t is the current at the current moment t, and I (t-1) is the current at the previous moment. The current change rate can reflect the increasing or decreasing trend of the current, and further reflect the changing trend of the UPS output capacity; furthermore, this embodiment can calculate the fluctuation amplitude of the current. Taking a preset time (such as 10 minutes) as a time period, calculate the difference between the maximum value and the minimum value of the current to obtain the influence of the load stability on the UPS output power; considering the time factor, this embodiment can further divide 24 hours of a day into 24 time periods, and assign characteristic values to each time period to obtain the load change situation and the changing trend of the UPS output power within each time period.

[0078] This embodiment does not limit the specific type of the regression model. Generally, it can be a multiple linear regression model. This embodiment can construct a regression model for each UPS output line respectively.

[0079] In this embodiment, the expression of the multiple linear regression model is:

[0080] ;

[0081] In the formula, is the output power of the output line in the uninterruptible power supply data, is the current data of the output line, is the ambient temperature in the uninterruptible power supply data, i is the data time point, is the first model parameter, is the second model parameter, is the third model parameter.

[0082] This embodiment can determine the model parameters of the regression model based on the historical current data of each output line and the uninterruptible power supply 01 data; input the real-time current data into the regression model to obtain the predicted output power of each output line; if it is determined that the line is underloaded based on the predicted output power, an underload regulation instruction for the output line is generated; if it is determined that the line is overloaded based on the predicted output power, an overload regulation instruction for the output line is generated.

[0083] Specifically, the multiple linear regression models of each output line are trained with the historical output power data, current data, and temperature data of each output line to obtain the model parameters of each multiple linear regression model. This embodiment does not limit the specific method for determining the model parameters. Generally, the loss function of the multiple linear regression model can be:

[0084] ;

[0085] In the formula, L is the loss function, and n is the total number of data sampling points.

[0086] This embodiment can determine the model parameters by the gradient descent method and use the mean square error to evaluate the prediction performance of the model. If the model performance is not good, continuously adjust the model parameter values in the multiple linear regression model to improve the prediction accuracy.

[0087] This embodiment can determine the relationship between the load power and the rated output power of the UPS: After the real-time collected current transmitter 02 data is processed as described above, it is input into the trained prediction model to obtain the predicted output power of each output line of the UPS.

[0088] If it is determined that the line is underloaded based on the real-time predicted output power, an underload regulation instruction for the corresponding output line is generated; the underload regulation instruction is used to reduce the output power of the output line; if it is determined that the line is overloaded based on the real-time predicted output power, an overload regulation instruction for the corresponding output line is generated; the overload regulation instruction is used to increase the output power of the output line.

[0089] This embodiment does not limit the specific definitions of line underload and line overload. Generally, line underload means that the output power of the output line decreases by 60% within 30S; line overload means any combination of the current line output power increasing by 10% within 10s, the total output line output power exceeding 125% of the rated load for 5min, and the total output line output power exceeding 150% of the rated load for 30s. The above-defined line underload and line overload are only relative to the previous time period, so no alarm will be issued.

[0090] The uninterruptible power supply 01 in this embodiment can have good overload capacity (total load). For example, it can operate stably for a long time at 110% of the rated load; it can maintain operation for at least 10 minutes at 125% of the rated load; it can maintain operation for at least 1 minute at 150% of the rated load. Generally, a certain load margin is left according to the electrical equipment of the unit. The uninterruptible power supply 01 can also have good overvoltage capacity. For example, when the input voltage is 2.3 times the rated voltage, it can maintain the battery mode for at least 1 minute.

[0091] The controller 03 in this embodiment may further include an HMI (Human Machine Interface) interface. The HMI interface is used to display the data of the uninterruptible power supply 01 stored in the local database, the current data of the current transmitter 02, and the arithmetic processing data of the output capacity control method. The local database stores data for data traceability.

[0092] The uninterruptible power supply system in this embodiment may further include: a SCADA (Supervisory Control And Data Acquisition) system; the controller 03 performs data interaction with the server database through a switch, and displays the data of the uninterruptible power supply 01, the current data of the current transmitter 02, and the arithmetic processing data of the output capacity control method in the server database through the interface of the SCADA system of the booster station in real time.

[0093] In this embodiment, the interfaces of the HMI and the SCADA system can specifically display the UPS output phase voltage, UPS output current, UPS output active power, UPS output reactive power, UPS output frequency, UPS output load rate, and UPS output load power factor, etc.

[0094] In this embodiment, an example of the architecture of the uninterruptible power supply 01 can be as Figure 2 shown, specifically including a rectified AC input 09, a bypass AC input 08, a rectifier 10, a charger / discharge device 13, a battery 14, an inverter 11, a static switch 12, and an AC output 15 (including a UPS output power control module), etc.

[0095] When the input source - rectified AC input 09 is in a normal state, the rectifier 10 and the inverter 11 start to work. On the one hand, they provide the UPS AC output 15 for the load. On the other hand, the rectifier 10 charges the battery 14 through the charger 13. When an abnormal situation occurs in the input source - rectified AC input 09, the rectifier 10 stops working. At this time, the battery 14 starts to discharge and provides the UPS AC output 15 for the load through the inverter 11. When the battery 14 discharges to the cut-off voltage, the inverter 11 shuts down. If the input source - bypass AC input 08 can supply power, the bypass AC input 08 directly provides the UPS AC output 15 for the load. If the bypass AC input 08 cannot supply power, the load will lose power. The time period from the abnormality of the input source - rectified AC input 09 to the battery 14 reaching the cut-off voltage is the battery backup time, and the length of this time depends on the load and the battery capacity.

[0096] It should be noted that the static switch 12 can control the power supply source of the load. Under normal circumstances, the load is powered by the inverter 11. If the inverter 11 fails or overloads and times out, it will switch to be powered by the bypass AC input 08.

[0097] The uninterruptible power supply 01 in this embodiment may further include a temperature compensation module for collecting the ambient temperature of the uninterruptible power supply 01; when the ambient temperature is higher than the center point temperature, the charging voltage is reduced when charging the battery 14; when the ambient temperature is lower than the center point temperature, the charging voltage is increased when charging the battery 14.

[0098] In this embodiment, the output circuit of the uninterruptible power supply system can be as Figure 3 shown. One live wire (L - 230V) and one neutral wire (N - 230V) in the 230V voltage circuit are connected to the input end of the uninterruptible power supply 01. The uninterruptible power supply outputs four adjustable alternating currents. Each output line collects current data through a current transmitter 02 (U1, U2, U3, U4) and sends the collected current data to the controller 03.

[0099] The first output circuit of the uninterruptible power supply 01 is connected to the input end of the medium-voltage switchgear cabinet 04 of the wind turbine generator set; the first regulated alternating current output by the first output circuit is used for remote control, remote signaling and remote measurement of the medium-voltage switchgear cabinet system; the second output circuit is connected to the input end of the high-voltage switchgear cabinet 05 of the wind turbine generator set; the second regulated alternating current output by the second output circuit is used for remote control, remote signaling and remote measurement of the high-voltage switchgear cabinet system; the third output circuit is connected to the input end of the converter integrated cabinet 06 of the wind turbine generator set; the third regulated alternating current output by the third output circuit is used for equipment power supply of the converter integrated cabinet 06; the fourth output circuit is connected to the input end of the nacelle main control cabinet 07 of the wind turbine generator set; the fourth regulated alternating current output by the fourth output circuit is used for equipment power supply of the nacelle main control cabinet 07. The switching power supply in the converter integrated cabinet equipment can provide 24V power supply for the controller 03.

[0100] Based on the above embodiments, the present invention generates a regulation instruction by the controller receiving the data collected by the uninterruptible power supply and the current transmitter, realizes the real-time regulation of the output power based on the load, avoids the situation of resource waste or the inability to meet the power demand of the load, and ensures the safe and stable operation of the equipment.

[0101] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including an..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

Claims

1. An uninterruptible power supply system, characterized in that, Including: Uninterruptible power supply, current transmitter and controller; The uninterruptible power supply is used to output multiple paths of adjustable alternating current; Based on the received regulation instruction, control the output power of each output line; The uninterruptible power supply is communicatively connected to the controller; The current transmitter is used to collect the current data of the multiple paths of adjustable alternating current; The current transmitter is communicatively connected to the controller; The controller is used to generate a regulation instruction through an output capacity control method based on the received uninterruptible power supply data of the uninterruptible power supply and the current data of the current transmitter, and send the regulation instruction to the uninterruptible power supply; Generating the regulation instruction through the output capacity control method based on the received uninterruptible power supply data of the uninterruptible power supply and the current data of the current transmitter includes: Receiving the uninterruptible power supply data from the uninterruptible power supply and the current data of the current transmitter; Performing data cleaning and data balancing processing on the historical current data, and constructing a regression model for each output line; Determining the model parameters of the regression model based on the historical current data and the uninterruptible power supply data of each output line; Inputting the real-time current data into the regression model to obtain the predicted output power of each output line; If it is determined that the line is underloaded based on the predicted output power, generate an underload regulation instruction for the output line; If it is determined that the line is overloaded based on the predicted output power, generate an overload regulation instruction for the output line; The regression model is a multiple linear regression model; the expression of the multiple linear regression model is: y i = β0 + β1x 1i + β2x 2i ; where y i is the output power of the output line in the uninterruptible power supply data, x 1i is the current data of the output line, x 2i is the ambient temperature in the uninterruptible power supply data, i is the data time point, β0 is the first model parameter, β1 is the second model parameter, and β2 is the third model parameter.

2. The uninterruptible power supply system according to claim 1, wherein The line underload means that the output power of the output line decreases by 60% within 30S; the line overload means any combination of the current line output power increasing by 10% within 10s, the total output line output power exceeding 125% of the rated load for 5min, and the total output line output power exceeding 150% of the rated load for 30s.

3. The uninterruptible power supply system according to claim 1, wherein, The controller is a PLC controller; The uninterruptible power supply is connected to the PLC controller through RS458 to construct a first communication link; The uninterruptible power supply is connected to the digital input / output module of the PLC controller through dry contacts to construct a second communication link; The current transmitter is connected to the analog input module of the PLC controller to construct a third communication link; The first communication link is used to transmit the main circuit related signals, bypass related signals, output related signals, battery related signals and each load related signals of the uninterruptible power supply; The second communication link is used to transmit the UPS inverter OK feedback signal, UPS protection shutdown signal and the signal to notify the UPS unit and perform off-network manual debugging; The third communication link is used to transmit the current data collected by the current transmitter.

4. The uninterruptible power supply system according to claim 1, wherein The multiple paths of adjustable alternating current are four paths of adjustable alternating current; The first output circuit is connected to the input end of the medium voltage switch cabinet of the wind turbine generator set; the first path of adjustable alternating current output by the first output circuit is used for remote control, remote signaling and remote measurement of the medium voltage switch cabinet system; The second output circuit is connected to the input end of the high-voltage switch cabinet of the wind turbine; the second regulated alternating current output by the second output circuit is used for remote control, remote signaling, and remote measurement of the high-voltage switch cabinet system; The third output circuit is connected to the input end of the converter integrated cabinet of the wind turbine, and the third regulated alternating current output by the third output circuit is used for equipment power supply of the converter integrated cabinet; The fourth output circuit is connected to the input end of the nacelle main control cabinet of the wind turbine, and the fourth regulated alternating current output by the fourth output circuit is used for equipment power supply of the nacelle main control cabinet.

5. The uninterruptible power supply system according to claim 1, wherein It further includes: SCADA system; The controller performs data interaction with the server database through a switch, and displays in real time the uninterruptible power supply data of the uninterruptible power supply, the current data of the current transmitter, and the arithmetic processing data of the output capacity control method in the server database through the interface of the SCADA system of the step-up substation.

6. The uninterruptible power supply system according to claim 1, wherein The uninterruptible power supply further includes: A temperature compensation module for collecting the ambient temperature of the uninterruptible power supply; when the ambient temperature is higher than the center point temperature, the charging voltage is reduced during battery charging; when the ambient temperature is lower than the center point temperature, the charging voltage is increased during battery charging.

7. The uninterruptible power supply system according to claim 1, wherein, The uninterruptible power supply is used to output 230V multi-channel regulated alternating current; The high-voltage grid power is stepped down to 400V through an oil-type transformer, a dry-type transformer, and a converter-side transformer connected in sequence; one phase wire and one neutral wire are selected from the 400V voltage circuit and connected to the input end of the uninterruptible power supply.

8. The uninterruptible power supply system according to claim 1, wherein The controller further includes: An HMI interface for displaying the uninterruptible power supply data of the uninterruptible power supply stored in the local database, the current data of the current transmitter, and the arithmetic processing data of the output capacity control method.

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