Uninterruptible power supply system

Abstract

The invention discloses an uninterruptible power supply system, which is applied to the field of wind turbine generator equipment and comprises an uninterruptible power supply, a current transmitter and a controller, the uninterruptible power supply is used for outputting multiple paths of controllable alternating current; controlling the output power of each output line based on the received regulation and control instruction; the uninterruptible power supply is in communication connection with the controller; the current transmitter is used for collecting current data of the multiple paths of controllable alternating current; the current transmitter is in communication connection with the controller; and the controller is used for generating a regulation and control 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 sending the regulation and control instruction to the uninterruptible power supply. The controller receives the data collected by the uninterruptible power supply and the current transmitter to generate the regulation and control instruction, so that the real-time regulation and control of the output power based on the load are realized, the situation that resources are wasted or the power demand of the load cannot be met is avoided, and the safe and stable operation of equipment is ensured.

Description

Technical Field

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

[0002] During the operation of wind turbines, sudden situations such as grid failures and lightning strikes may cause power supply interruptions, thus affecting the normal operation of wind turbines. In offshore wind power projects, high requirements are placed on power supply stability, and wind turbines are generally equipped with uninterruptible power supplies to power the equipment. Since the output capacity of UPS is often fixed, and the offshore environment is changeable, the equipment load varies greatly. Existing technologies cannot make intelligent and dynamic adjustments based on the actual load of the equipment, resulting in waste of resources or failure to meet the power demand of the load in some special cases, and failure to ensure 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 for use in the field of wind turbine equipment. The system receives data collected by an uninterruptible power supply and a current transmitter through a controller, and then generates control instructions for controlling the output power, thereby realizing real-time control of the output power based on the load, avoiding waste of resources or failure to meet the power demand of the load, and ensuring safe and stable operation of the equipment.

[0004] In order to solve the above technical problems, the present invention provides an uninterruptible power supply system, comprising: an uninterruptible power supply, a current transmitter and a controller;

[0005] The uninterruptible power supply is used to output multiple adjustable alternating currents; the output power of each output line is controlled based on the received control instructions; the uninterruptible power supply is communicatively connected with the controller;

[0006] The current transmitter is used to collect current data of the multiple channels of adjustable alternating current; the current transmitter is communicatively connected with the controller;

[0007] The controller is used to generate a control 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 control instruction to the uninterruptible power supply.

[0008] Optionally, the generating a control 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 includes:

[0009] receiving the uninterruptible power supply data from the uninterruptible power supply and the current data from the current transmitter;

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

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

[0012] Inputting 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, generating an underload control instruction for the output line;

[0014] If the line is determined to be overloaded based on the predicted output power, an overload control instruction for the output line is generated.

[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 30 seconds; the line overload means any combination of the current line output power increasing by 10% within 10 seconds, the output power of the total output lines exceeding 125% of the rated load for 5 minutes, and the output power of the total output lines exceeding 150% of the rated load for 30 seconds.

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

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

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

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

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

[0024] The second communication link is used to transmit the UPS inverter OK feedback signal of the uninterruptible power supply, the UPS protection shutdown signal, and the UPS unit notification and offline manual debugging signal;

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

[0026] Optionally, the multiple channels of adjustable alternating current are four channels of adjustable alternating current;

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

[0028] The second output circuit is connected to the input end of the high-voltage switchgear of the wind turbine generator set; the second 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;

[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 adjustable alternating current output by the third output circuit is used to power the equipment of the converter integrated cabinet;

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

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

[0032] The controller exchanges data 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 and processing data of the output capacity control method in the server database in real time through the interface of the SCADA system of the booster station.

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

[0034] The temperature compensation module is used 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 lowered 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-channel adjustable alternating current;

[0036] The high voltage electricity of the power grid is stepped down to 400V through an oil-type transformer, a dry-type transformer and a current transformer connected in sequence; a phase line and a neutral line 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] The HMI interface is used to display the uninterruptible power supply data of the uninterruptible power supply, the current data of the current transmitter and the calculation and processing data of the output capacity control method stored in the local database.

[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 adjustable alternating currents; the output power of each output line is controlled based on the received control instructions; the uninterruptible power supply is connected to the controller in communication; the current transmitter is used to collect current data of multiple adjustable alternating currents; the current transmitter is connected to the controller in communication; the controller is used to generate control instructions 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 control instructions to the uninterruptible power supply. The controller receives the data collected by the uninterruptible power supply and the current transmitter to generate control instructions, which realizes real-time control of the output power based on the load, avoids the waste of resources or the situation where the power demand of the load cannot be met, and ensures the safe and stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

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

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

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

[0044] Figure markings: 01-uninterruptible power supply; 02-current transmitter; 03-controller; 04-medium voltage integrated cabinet; 05-high voltage integrated cabinet; 06-converter integrated cabinet; 07-cabin main control cabinet; 08-bypass AC input; 09-rectified AC input; 10-rectifier; 11-inverter; 12-static switch; 13-charger / discharger; 14-battery; 15-AC output. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] As wind power continues to account for an increasing share of the global energy mix, the reliability and stability of wind turbines have become critical. During the operation of wind turbines, emergencies such as grid failures 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 battery life of uninterruptible power supplies, especially in offshore projects. Owners generally require uninterruptible power supplies (UPS) to last for 2 hours. The current UPS system mainly consists of three parts: converter UPS, tower base UPS, and cabin UPS. Adding a battery pack inside affects the volume and layout of the existing converter integrated cabinet and cabin main control cabinet; adding a battery pack outside not only affects the appearance, but also requires a separate cabinet that meets the requirements of the offshore environment, which greatly increases the cost.

[0047] At the same time, the above-mentioned UPS are usually standardized products that adopt high-frequency technology routes, and have disadvantages in reliability compared to industrial frequency technology routes. It is also very rare for a single UPS to provide centralized power supply and centralized dynamic scheduling control for all equipment of wind turbines 230V and below.

[0048] In addition, the UPS output capacity is often fixed and cannot be intelligently and dynamically adjusted according to the actual load, which leads to waste of resources or inability to meet the power demand of the load in some special cases; and the monitoring of 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, which replaces the three parts of the wind turbine equipment, namely the converter UPS, tower base UPS and cabin UPS, by a single UPS with multiple outputs. There is no need to make additional changes to the volume and layout of the cabinet of the offshore wind turbine, and the battery capacity is expanded while reducing costs. The output current of the UPS power supply is industrial frequency current, which ensures the stability of equipment operation. The controller further receives data collected by the uninterruptible power supply and the current transmitter to generate control instructions, thereby realizing real-time control of the output power based on the load, avoiding waste of resources or failure to meet the power demand of the load, and ensuring safe and stable operation of the equipment.

[0050] The following combination Figure 1 , Figure 1 This 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 adjustable alternating currents; the output power of each output line is controlled based on the received control instructions; the uninterruptible power supply 01 is in communication connection with the controller 03;

[0052] The current transmitter 02 can be used to collect current data of multiple adjustable alternating currents; the current transmitter 02 is connected in communication with the controller 03;

[0053] The controller 03 may be used to generate a control instruction through an output capacity control method based on the received UPS 01 data and the current data of the current transmitter 02 , and send the control instruction to the UPS 01 .

[0054] This embodiment does not limit the number of UPS output circuits, which can generally be four, that is, multiple adjustable AC power is four adjustable AC power. The four output circuits can be connected to the medium voltage switch cabinet 04, the high voltage switch cabinet 05, the converter integrated cabinet 06 and the cabin main control cabinet 07 respectively.

[0055] Specifically, the first output circuit is connected to the input end of the medium-voltage switch cabinet 04 of the wind turbine generator set; the first adjustable AC power output by the first output circuit is used for remote control, remote signaling and remote measurement of the medium-voltage switch cabinet system;

[0056] The second output circuit is connected to the input end of the high-voltage switch cabinet 05 of the wind turbine generator set; the second adjustable AC power output by the second output circuit is used for remote control, remote signaling and remote measurement of the high-voltage switch cabinet system;

[0057] The third output circuit is connected to the input end of the converter cabinet 06 of the wind turbine generator set; the third adjustable AC power output by the third output circuit is used to power the equipment of the converter cabinet 06;

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

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

[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 abnormal conditions such as overload and short circuit to protect the system safety.

[0061] Further, in this embodiment, the converter integrated cabinet 06 may be provided with 230V equipment, such as a switching power supply, a three-way valve of a water cooling system, a lighting system, various fan heating belts of a water cooling system, sockets, a harmful gas alarm lamp, a fire protection system, an air detector, a debugging cabinet, etc.;

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

[0063] The 230V equipment in the cabin main control cabinet 07 may include switch power supply, lightning detection, aviation obstruction lights, harmful gas warning lights, bird repellent, cabin control cabinet lighting, online status monitoring system, gearbox status monitoring system, safety relay, water cooling system three-way valve, etc.;

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

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

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

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

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

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

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

[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 method of generating the control instruction through the output capacity control method based on the received uninterruptible power supply 01 data 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, cosφ is the power factor, and U=230±1V (the UPS system monitors each output voltage in real time). The power factor cosφ of the industrial frequency UPS is 0.8 on average, and the UPS output power P is basically linearly related to the current I. Moreover, the maximum capacity of the load behind each output is clear, so the corresponding current range is determined.

[0073] The controller 03 in this embodiment may first receive the uninterruptible power supply 01 data from the uninterruptible power supply 01 and the current data from 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 be collected at a frequency of 10 times per second to obtain sufficient time series data.

[0075] In this embodiment, data cleaning can be used to remove obviously abnormal data points. As mentioned above, the output power and total load of each channel of the uninterruptible power supply 01 are clear. If the current value suddenly becomes extremely large or extremely small, exceeding the normal working range, it may be caused by measurement error or instantaneous interference. These data points are removed through the algorithm.

[0076] In this embodiment, data balancing can eliminate current fluctuations and reduce the impact of noise on subsequent analysis. In this embodiment, a moving average method can be used to perform data balancing. For example, the average value of m adjacent data points (taking m=10, which is 1 second) is calculated 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, the rate of change of the current is calculated. For example, the difference between the currents at adjacent time points ∆I=I t -I (t-1) , where I t is the current at the current time t, I (t-1) is the current at the previous moment. The current change rate can reflect the increase or decrease trend of the current, and further reflect the change trend of the UPS output capacity; further, 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 and minimum values ​​of the current, and obtain the impact of the load stability on the UPS output power; considering the time factor, this embodiment can further divide 24 hours a day into 24 time periods, and assign a characteristic value to each time period, and obtain the load change situation in each time period and the change trend of the UPS output power.

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

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

[0080] ;

[0081] In the formula, 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 the line is determined to be underloaded based on the predicted output power, an underload control instruction for the output line is generated; if the line is determined to be overloaded based on the predicted output power, an overload control instruction for the output line is generated.

[0083] Specifically, the multivariate linear regression model of each output line is trained through the historical output power data, current data and temperature data of each output line to obtain the model parameters of each multivariate linear regression model. This embodiment does not limit the specific method of determining the model parameters. Generally, the loss function of the multivariate 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] In this embodiment, the model parameters can be determined by the gradient descent method, and the mean square error can be used to evaluate the prediction performance of the model. If the model performance is poor, the model parameter values ​​in the multivariate linear regression model are continuously adjusted to improve the prediction accuracy.

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

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

[0089] This embodiment does not limit the specific definition of line underload and line overload. Generally, line underload means that the output power of the output line decreases by 60% within 30 seconds; line overload means any combination of the current line output power increasing by 10% within 10 seconds, the output power of the total output line exceeding 125% of the rated load for 5 minutes, and the output power of the total output line exceeding 150% of the rated load for 30 seconds. 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), such as outputting 110% rated load to be able to operate stably for a long time; outputting 125% rated load to be able to be maintained for at least 10 minutes; outputting 150% rated load to be able to be maintained for at least 1 minute. Generally, a certain load margin is reserved according to the electrical equipment of the unit. The uninterruptible power supply 01 can also have good overvoltage capacity, such as inputting 2.3 times the rated voltage to be able to maintain the battery mode for at least 1 minute.

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

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

[0093] In this embodiment, the HMI interface and the SCADA system interface can specifically display 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.

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

[0095] When the input source - rectified AC input 09 is in a normal state, the rectifier 10 and the inverter 11 start working, on the one hand, providing UPS AC output 15 for the load, and on the other hand, the rectifier 10 will charge the battery 14 through the charger 13. When the input source - rectified AC input 09 is abnormal, the rectifier 10 will stop working, and the battery 14 will start to discharge, and provide UPS AC output 15 for the load through the inverter 11. When the battery 14 discharges to the termination voltage, the inverter 11 is turned off. If the input source - bypass AC input 08 can provide power, the bypass AC input 08 directly provides UPS AC output 15 for the load. If the bypass AC input 08 cannot supply power, the load will be powered off. The time period from the input source - rectified AC input 09 abnormality to the battery 14 reaching the termination voltage is the battery backup time, and the length of this time depends on the load and the battery capacity.

[0096] It is worth noting 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 is overloaded for a timeout, it will be switched to the bypass AC input 08 for power supply.

[0097] The uninterruptible power supply 01 in this embodiment may also 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 lowered 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 follows Figure 3 As shown, a live wire (L-230V) and a neutral wire (N-230V) in a 230V voltage circuit are connected to the input end of an 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 the collected current data is sent to a controller 03.

[0099] The first output circuit of the uninterruptible power supply 01 is connected to the input end of the medium voltage switch cabinet 04 of the wind turbine; the first adjustable AC power 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 05 of the wind turbine; the second adjustable AC power 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 cabinet 06 of the wind turbine; the third adjustable AC power output by the third output circuit is used for power supply of the equipment of the converter cabinet 06; the fourth output circuit is connected to the input end of the cabin main control cabinet 07 of the wind turbine; the fourth adjustable AC power output by the fourth output circuit is used for power supply of the equipment of the cabin main control cabinet 07. The switching power supply in the converter cabinet equipment can provide 24V power supply for the controller 03.

[0100] Based on the above embodiments, the present invention generates control instructions by receiving data collected by an uninterruptible power supply and a current transmitter through a controller, thereby realizing real-time control of the output power based on the load, avoiding waste of resources or failure to meet the power demand of the load, and ensuring safe and stable operation of the equipment.

[0101] In this article, relational terms such as first and second, etc. are used only 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 terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. An uninterruptible power supply system, characterized in that: include: Uninterruptible power supplies, current transmitters and controllers; The uninterruptible power supply is used to output multiple channels of adjustable alternating current; Controlling the output power of each output line based on the received control command; The uninterruptible power supply is communicatively connected with the controller; The current transmitter is used to collect current data of the multiple channels of adjustable alternating current; The current transmitter is communicatively connected with the controller; The controller is used to generate a control 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 control instruction to the uninterruptible power supply.

2. The uninterruptible power supply system according to claim 1, characterized in that: The generating of the control instruction by 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 comprises: receiving the uninterruptible power supply data from the uninterruptible power supply and the current data from the current transmitter; Performing data cleaning and data balancing on the historical current data, and constructing a regression model for each output line; Determining model parameters of the regression model based on the historical current data of each of the output lines and the uninterruptible power supply data; 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, generating an underload control instruction for the output line; If the line is determined to be overloaded based on the predicted output power, an overload control instruction for the output line is generated.

3. The uninterruptible power supply system according to claim 2, characterized in that: The regression model is a multiple linear regression model; the expression of the multiple linear regression model is: ； 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.

4. The uninterruptible power supply system according to claim 2, characterized in that: The line underload refers to the output power of the output line decreasing by 60% within 30 seconds; the line overload refers to any combination of the current line output power increasing by 10% within 10 seconds, the output power of the total output line exceeding 125% of the rated load for 5 minutes, and the output power of the total output line exceeding 150% of the rated load for 30 seconds.

5. The uninterruptible power supply system according to claim 1, characterized in that: The controller is a PLC controller; The uninterruptible power supply is connected to the PLC controller via RS458 to establish a first communication link; The uninterruptible power supply is connected to the digital input and output module of the PLC controller via dry contacts to establish a second communication link; The current transmitter is connected to the analog input module of the PLC controller to establish a third communication link; The first communication link is used to transmit main-related signals, bypass-related signals, output-related signals, battery-related signals and various load-related signals of the uninterruptible power supply; The second communication link is used to transmit the UPS inverter OK feedback signal of the uninterruptible power supply, the UPS protection shutdown signal, and the UPS unit notification and offline manual debugging signal; The third communication link is used to transmit the current data collected by the current transmitter.

6. The uninterruptible power supply system according to claim 1, characterized in that: The multi-channel adjustable alternating current is four-channel adjustable alternating current; The first output circuit is connected to the input end of the medium-voltage switchgear of the wind turbine generator set; the first adjustable AC power output by the first output circuit is used for remote control, remote signaling and remote measurement of the medium-voltage switchgear system; The second output circuit is connected to the input end of the high-voltage switchgear of the wind turbine generator set; the second 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; The third output circuit is connected to the input end of the converter integrated cabinet of the wind turbine generator set, and the third adjustable alternating current output by the third output circuit is used to power the equipment of the converter integrated cabinet; The fourth output circuit is connected to the input end of the cabin main control cabinet of the wind turbine generator set, and the fourth adjustable alternating current output by the fourth output circuit is used to power the equipment of the cabin main control cabinet.

7. The uninterruptible power supply system according to claim 1, characterized in that: Also includes: SCADA system; The controller exchanges data 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 and processing data of the output capacity control method in the server database in real time through the interface of the SCADA system of the booster station.

8. The uninterruptible power supply system according to claim 1, characterized in that: The uninterruptible power supply further comprises: The temperature compensation module is used 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 lowered when charging the battery; when the ambient temperature is lower than the center point temperature, the charging voltage is increased when charging the battery.

9. The uninterruptible power supply system according to claim 1, characterized in that: The uninterruptible power supply is used to output 230V multi-channel adjustable alternating current; The high voltage electricity of the power grid is stepped down to 400V through an oil-type transformer, a dry-type transformer and a current transformer connected in sequence; a phase line and a neutral line are selected from the 400V voltage circuit and connected to the input end of the uninterruptible power supply.

10. The uninterruptible power supply system according to claim 1, characterized in that: The controller further includes: The HMI interface is used to display the uninterruptible power supply data of the uninterruptible power supply, the current data of the current transmitter and the calculation and processing data of the output capacity control method stored in the local database.

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