CN-122026591-A - Wind turbine generator system variable pitch backup power system and wind turbine generator system

CN122026591ACN 122026591 ACN122026591 ACN 122026591ACN-122026591-A

Abstract

The invention provides a wind turbine generator pitch-changing backup power supply system and a wind turbine generator, wherein a super capacitor assembly and a fault energy leakage assembly are electrically connected with a charger assembly and are in signal communication through a primary power cable and a secondary signal cable, the super capacitor assembly is formed by connecting a plurality of super capacitors in series, each capacitor in the module is provided with a voltage equalizing circuit, the super capacitor assembly is integrated with an over-temperature alarm loop and an over-voltage alarm loop, the charger assembly primary loop converts externally input alternating current into direct current which is matched with the charging requirement of the super capacitor assembly, the charger assembly secondary loop is integrated with a singlechip, system parameters are collected and the super capacitor state is calculated, a high-power resistor of the fault energy leakage assembly is connected with the super capacitor assembly through a circuit breaker and a contactor in sequence to form an energy leakage loop, and the charger assembly controls the on-off of a contactor coil through a digital output signal so as to control the on-off of the energy leakage loop. The whole system can provide full-power electric energy for the pitch drive instantaneously.

Inventors

Cai Lihu
PU YANZHOU
GAO LEI
MAN CHAOJUN
BAI BIN
LIU YUTONG

Assignees

大连尚佳新能源科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251230

Claims (10)

1. The wind turbine generator pitch-controlled backup power system is characterized by comprising a super capacitor assembly, a charger assembly and a fault energy release assembly, wherein the super capacitor assembly and the fault energy release assembly are electrically connected with the charger assembly and in signal communication through a primary power cable and a secondary signal cable; the super capacitor assembly is formed by connecting a plurality of super capacitors in series, each capacitor in the module is provided with a voltage equalizing circuit, and the super capacitor assembly is integrated with an over-temperature alarm loop and an over-voltage alarm loop so as to output corresponding digital quantity alarm signals to the charger assembly; The charger assembly comprises a primary loop and a secondary loop, wherein the primary loop is used for converting externally input alternating current into direct current which is adaptive to the charging requirement of the super capacitor assembly, and the secondary loop is integrated with a singlechip and is used for acquiring system parameters and calculating the state of the super capacitor; The high-power resistor is connected with the super capacitor component through the breaker and the contactor in sequence to form an energy discharging loop, and the charger component controls the on-off of a coil of the contactor through a digital output signal so as to control the opening and closing of the energy discharging loop.
2. The variable pitch backup power supply system of a wind turbine generator according to claim 1, wherein the super capacitor assembly is integrated with an over-temperature alarm loop and an over-voltage alarm loop, and specifically comprises a plurality of functional interface loops arranged on the outside of a module of the super capacitor assembly, and the system at least comprises: a temperature state feedback loop for feeding back whether the temperature exceeds a threshold value or not through a temperature control switch; The temperature sampling loop is used for collecting and transmitting the real-time temperature of the super capacitor assembly through the temperature sensor transmission module; a voltage state feedback loop for feeding back whether the voltage exceeds a threshold value through the piezoresistor; and the voltage sampling loop is used for outputting the actual voltage of the super capacitor assembly after the actual voltage is attenuated in proportion through the voltage dividing circuit.
3. The wind turbine generator system pitch backup power system of claim 2, wherein the primary circuit of the charger assembly comprises a rectifying plate and a power board, the rectifying plate converts input three-phase alternating current into direct current, and the power board converts the direct current into direct current meeting the charging parameter requirements of the super capacitor assembly through a full-bridge topology.
4. The wind turbine generator system pitch backup power system according to claim 3, wherein the singlechip of the secondary circuit of the charger component collects parameters of the temperature of the main transformer of the power board, the input voltage of the charger component, the output voltage of the charger component, the voltage of the super capacitor component, the input current of the charger component and the output current in real time, calculates the actual capacity and the actual internal resistance of the super capacitor component based on the collected parameters, and identifies the short circuit and open circuit fault states of the super capacitor component.
5. The wind turbine generator system pitch backup power system according to claim 4, wherein the charger component supports three communication modes of RS485 communication, CANOPEN communication and IO communication, so as to upload the running state data and fault alarm information of the charger component to the main control system or the pitch driver in real time.
6. The wind turbine generator system variable pitch backup power system according to claim 5, wherein the charger component is externally provided with a plurality of groups of functional interfaces, and at least comprises a digital quantity input interface for monitoring states of a super capacitor component and various circuit breakers and fuses, a digital quantity output interface for controlling a fault energy release component and outputting fault signals, an analog quantity output interface of a reserved adapter interface, a communication interface for data interaction and a signal sampling interface for collecting voltages and temperatures of the super capacitor component.
7. The wind turbine generator system pitch backup power supply system according to claim 6, wherein the charger component is configured to execute a normal overvoltage and abnormal overvoltage judging process when the overvoltage of the super capacitor component is detected, control a fault energy release component contactor to briefly suck and release the voltage of the super capacitor component to a preset target voltage if the overvoltage is judged to be normal, immediately stop voltage output and send a fault signal and an overvoltage fault code to a main control system or a pitch controller if the overvoltage is judged to be abnormal, and control the fault energy release component contactor to continuously suck and release the voltage of the super capacitor component to zero voltage after the wind turbine generator system is stopped.
8. The wind turbine generator system variable pitch backup power system according to claim 7 is characterized in that if the actual voltage of the super capacitor assembly fluctuates within a range of +/-0.5% of rated voltage and the triggering frequency of the overvoltage state is less than or equal to 1 time within 240 hours, normal overvoltage is judged, and if the actual voltage of the super capacitor assembly exceeds the range of +/-0.5% of rated voltage and the triggering frequency of the super capacitor assembly is more than or equal to 2 times within 240 hours, or an overvoltage alarm signal output by the super capacitor assembly is received, abnormal overvoltage is judged.
9. The wind turbine generator pitch backup power system according to any one of claims 1-8, further comprising a front-end self-test logic that is automatically triggered before each start of the wind turbine generator, wherein the self-test items include at least checking a charger component input voltage range, confirming consistency of a charger component dc bus voltage with a preset value, checking a charger component main transformer temperature, checking an ambient temperature and a super capacitor component temperature, and detecting whether a voltage and a capacity of the super capacitor component meet a preset number of pitch operation conditions, and only when all self-test items are qualified, the wind turbine generator is allowed to start, otherwise, a wind turbine generator start-up process is locked and a fault alarm signal is sent.
10. Wind turbine comprising a wind turbine pitch backup power system according to any of claims 1-9.

Description

Wind turbine generator system variable pitch backup power system and wind turbine generator system Technical Field The invention belongs to the field of new energy power generation, relates to a wind turbine generator pitch control system technology, and particularly relates to a wind turbine generator pitch control backup power supply system and a wind turbine generator. Background The backup power supply of the variable-pitch driver of the wind turbine generator is core emergency guarantee equipment for guaranteeing safe operation of the wind turbine generator, and particularly relates to an independent power supply unit capable of providing stable and continuous electric energy for the variable-pitch driver in real time and guaranteeing normal action of a variable-pitch executing mechanism (a variable-pitch motor or a hydraulic actuator) when a main power supply (usually a cabin generator or a power grid) fails and breaks. The key function of the wind turbine generator system is to avoid the risk of paralysis of the variable pitch drive caused by failure of the main power supply and provide key energy support for the wind turbine generator system to enter a safe shutdown state. In the prior art, a standby power supply system of a typical wind generating set, as disclosed in patent application CN219611404U, mainly comprises an energy storage battery, a DC/DC converter, a DC/AC converter and a pre-charging unit, and the scheme utilizes the function of the converter of the wind generating set itself, when the main power supply is interrupted, the energy storage battery establishes voltage for a direct current bus of the converter through the DC/DC converter, and supplies power to a first load (such as electrical equipment) in the fan through the DC/AC converter, and simultaneously, can supply power to a second load (such as a controller and a sensor) through an adaptive power supply. However, the prior art scheme mainly expands around the whole operation time of the extension standby power supply and the extended power supply object, and the core energy storage unit still adopts the traditional storage battery, so that the traditional storage battery still inherits the inherent series defects of the storage battery, and specifically, the scheme has the following objective defects that 1. The response speed is limited by multi-stage energy conversion (DC/DC and DC/AC) and complex switching logic (involving the interlocking and control of a plurality of switches), millisecond-level power supply switching required by variable-pitch driving after the main power supply failure of the wind turbine generator is difficult to realize, and the action interruption risk exists. 2. The energy storage battery adopted by the wind turbine generator has serious capacity attenuation, increased internal resistance and unstable discharge performance in a common high-altitude low-temperature severe environment, and the variable pitch actuator can not be guaranteed to still obtain full-rate and stable instantaneous power at extremely low temperature. Disclosure of Invention In order to solve the problems of response delay, weather resistance, poor anti-interference capability and the like of the conventional wind turbine generator pitch backup power supply, the invention provides a wind turbine generator pitch backup power supply system and a wind turbine generator, and by adopting the integrated design of a super capacitor assembly, a charger assembly and a fault energy release assembly, full-power electric energy can be provided for a pitch drive instantly, the capacity attenuation amplitude is small, the discharge performance is stable in a common high-altitude low-temperature environment of the wind turbine generator, the charge and discharge process is physical reaction, the safety performance is more reliable, and the emergency power supply reliability of the pitch system and the integral operation safety of the wind turbine generator are improved. The invention adopts the technical proposal for solving the technical problems that: The wind turbine generator pitch-variable backup power system comprises a super capacitor assembly, a charger assembly and a fault energy release assembly, wherein the super capacitor assembly and the fault energy release assembly are electrically connected with the charger assembly through a primary power cable and a secondary signal cable and are in signal communication; the super capacitor assembly is formed by connecting a plurality of super capacitors in series, each capacitor in the module is provided with a voltage equalizing circuit, and the super capacitor assembly is integrated with an over-temperature alarm loop and an over-voltage alarm loop so as to output corresponding digital quantity alarm signals to the charger assembly; The charger assembly comprises a primary loop and a secondary loop, wherein the primary loop is used for converting externally input alternating current into di