45results about How to "Achieve bumpless switching" patented technology

The invention relates to a single valve/sequence valve switching method for a steam turbine, particularly to a nonlinear automatic undisturbed single valve/sequence valve switching method for the steam turbine, and solves the problem that large load disturbance of unit power can be caused in the existing single valve steam distribution law and sequence valve steam distribution law on-line switching mode. The method includes selection of a switching point chi0 and a nonlinear switching valve; switching law optimization design; and determination of a nonlinear switching law of the steam distribution mode by three schemes: the switching method is determined through an experimental method, a theoretical calculation method or an experiment and theoretical calculation combined method.

The invention discloses a method for automatically selecting redundant data, an analyzer and a method for realizing non-interference switch. The method for automatically selecting the redundant data comprises the following steps: determining an original set consisting of all variables defined in a control program and a target set consisting of non-interference variables ensured to be output during host/standby switch, converting codes of the control program into a relationship set comprising a plurality of functional expressions and sequence information thereof, extracting a dependent variable, a corresponding independent variable and a corresponding functional expression from operation logic, optimizing the original set according to the target set and the relationship set, and selecting out a redundant optimal set to keep values of the variables in the target set accordant when the operation in later any positive integer period is finished after a host machine and a standby machine part copy and update the values of the variables in the redundant optimal set. The method is characterized in that a few redundant variables are acquired through selection from the original set in a redundancy configuration system, and then output variables are ensured to be kept accordant in the later any positive integer period when the values of the redundant variables are the same.

The invention discloses a redundant digital electric-hydraulic control system for a turbine, comprising a dual power switching device, a control unit and a man-machine interface, wherein, the control unit comprises a controller A, a controller B, a signal acquisition module group A, a signal acquisition module group B, a dual machine switching module and a plurality of communication modules; the controller A carries out signal interaction with a turboset and a servo system through the signal acquisition module group A; the controller B carries out signal interaction with the turboset and the servo system through the signal acquisition module group B; the controller A is connected with the controller B, and the controller A and the controller B respectively carry out information interaction with the man-machine interface through the communication modules; and the signal of the controller A and the controller B is connected to the dual machine switching module and the controller A and the controller B carry out information interaction with the man-machine interface through the communication modules. The redundant digital electric-hydraulic control system realizes the triplex redundancy design of the control unit, a power supply unit and the man-machine interface of the digital electric-hydraulic control system for the turbine, greatly prevents threat on normal operation of the turboset caused by faults of the control system, and ensures safe and reliable operation of the turboset under various working conditions.

The invention discloses a data seamless migration method and device; the method comprises the following steps: respectively building main node and backup node shearing memories, and a main node memory zone and a backup node memory zone; migrating memory information in the main node memory zone to the main node shearing memory, so the main node memory information is consistent with the backup node memory information; detecting the main node having a fault, accessing the sharing memory data, and realizing data seamless migration. The invention also discloses a data seamless migration device.

The invention discloses an electric pitch change control device which comprises a super capacitor, a drive controller, a current rectifier, an inverter and a microprocessor, wherein the current rectifier is used for converting an alternating current electrical signal into a direct current electrical signal and charging the super capacitor; the inverter is used for converting the direct current electrical signal into the alternating current electrical signal so as to drive the drive controller to run; the microprocessor is used for controlling the current rectifier, the inverter and the drive controller to run and realizing the arithmetic operation and logic control of the electric pitch change control device; the current rectifier, the super capacitor, the inverter and the drive controller are connected in sequence; and the microprocessor is connected with the current rectifier, the inverter and the drive controller. The electric pitch change control device disclosed by the invention realizes the undisturbed switching of a main power supply and a backup power supply by using the super capacitor as an online backup power supply without additionally arranging a charging device and a discharging device, thereby greatly improving the reliability of the electric pitch change system.

The invention belongs to the technical field of DCS control, and particularly relates to an undisturbed switching control method for a pneumatic control valve. A switching module is added into a PID control loop, and switching signals of the switching module come from on-off states of an electromagnetic valve; when the electromagnetic valve is in a power-on state, the electromagnetic valve is opened, the switching module does not act, and output MV of a PID controller is still output; when the electromagnetic valve is in a power-off state, the electromagnetic valve is closed, the switching module acts, and the output of the switching module is the 0% opening which accords with the actual condition of the control valve; meanwhile, output of the switching module is led into a TR port of the PID controller to force the PID controller to start a tracking mode, and output MV of the PID controller is 0%; and when the electromagnetic valve is powered on again, compressed air is sent to a main control valve again, the PID controller plays the role again, at the moment, the valve opening of the main control valve is 0%, output MV of the PID controller is also 0%, the PID controller restores a normal working mode, and the valve is adjusted according to results obtained by subtracting PV from SP.

The invention discloses a system and method for monitoring the water level of a nuclear power plant evaporator. The system comprises a deviation signal generation mechanism, a first master controller, a second master controller, a first slave controller, a mismatching signal generation mechanism, a negative deviation signal generation mechanism, a first manual controller, a second slave controller, a feedforward signal generation mechanism and a second manual controller. The first master controller and the second master controller are connected with the deviation signal generation mechanism. The first slave controller is connected with the first master controller and a large valve. The mismatching signal generation mechanism is connected with the first master controller and the first slave controller. The negative deviation signal generation mechanism and the first manual controller are connected with the first slave controller. The second slave controller is connected with the second master controller and a pet valve. The feedforward signal generation mechanism and the second manual controller are connected with the second master controller and the second slave controller respectively. According to the system and method for monitoring the water level of the nuclear power plant evaporator, manual control can be optimized to achieve undisturbed switching on the premise that automatic control is not influenced, so that manual control and automatic control over the large valve and the pet valve do not influence each other under any condition, and control over the water level of the evaporator is easier and more stable.

The invention provides an undisturbed switching method and device for redundant flight control modules of an unmanned aerial vehicle, and the device comprises the steps: enabling a first flight control module and a second flight control module to transmit PWM wave signals with a preset frequency to each other so as to monitor the states of each other, and enabling the other flight control module to be set as a main control module when one flight control module breaks down, since the data is always bidirectionally transmitted between the first flight control module and the second flight control module, the first flight control module can receive the flight data transmitted by the second flight control module at the first time for synchronization after the first flight control module breaks down and then recovers the main control function, thereby realizing the undisturbed switching of the flight control of the unmanned aerial vehicle.

The invention relates to a multistage pulse control method for a thermal power plant regulation valve. The method sequentially comprises the following steps that (1) a single circuit control logic is formed by a manual controller and a PID regulation unit, and an output instruction of the manual controller is introduced into a deviation value control circuit of the pulse regulation valve; (2) a deviation value of the output instruction of the manual controller and a position feedback pulse signal of the pulse regulation valve is generated, and a multistage control switching pulse is calculated through the deviation value; and (3) after the step (2) is completed, a control system is put into actual operation, and control parameters are adjusted online according to the real time value of a regulated variable of the control system and an action characteristic curve of the pulse regulation valve. Through the method, a pulse regulation valve system has the optimal transient performance and robustness, so that control over the regulated variable is more rapid and accurate.

The invention discloses a redundancy output and optimization switching method based on a single set of PLC analog quantity output signals. The problems of four basic (AO, AI, DO and DI) I/O signals ofa PLC widely applied to the field of industrial control are solved. Analog quantity output signals are affected by uniqueness of the signals received by terminal equipment and only one group of terminals for receiving the analog quantity output signals of a controlled terminal, so that redundant output and automatic optimization switching of the analog quantity output signals are difficult to realize. The robustness of the controlled equipment can be effectively improved, and unpredictable and uncontrollable faults and derived accidents thereof become controllable.

The invention relates to a method for calculating a NOx measurement value of a denitration inlet under a purging working condition by a system error method. According to the method, the NOx measurement value of the denitration inlet under the purging working condition is calculated by calculating a system error between the NOx measurement values of the denitration inlets on the two sides of a boiler. The method comprises: taking the A side as an example, under a normal working condition, outputting an A side denitration inlet NOx concentration measurement value; and under the A-side purging working condition, correcting the NOx concentration measurement value of the B-side denitration inlet by using a system error, and replacing the NOx concentration measurement value of the A-side denitration inlet with the corrected NOx concentration measurement value of the B-side denitration inlet for outputting. By means of the method, it can be guaranteed that the automatic denitration process is not interrupted in the denitration inlet NOx concentration measuring instrument purging process; in addition, undisturbed switching of NOx concentration signals of a denitration inlet at the purging moment can be achieved, and the possibility of excessive ammonia spraying or NOx emission exceeding the standard is reduced.

The invention discloses a cabin monitoring system based on dual redundancy, and the system comprises cabin monitoring devices which are used for monitoring the working state of equipment in a cabin, wherein the cabin monitoring devices are arranged in the cabin; comprehensive display devices used for displaying the monitoring data of the cabin monitoring devices, wherein the comprehensive displaydevices are arranged in the cabin and in dual-redundancy connection with the corresponding cabin monitoring devices; a data center used for storing and displaying the monitoring data of each cabin monitoring device, wherein the data center is arranged at a user side and is in dual-redundancy connection with each cabin monitoring device and each comprehensive display device; and a data terminal used for controlling the cabin monitoring devices and the comprehensive display devices, wherein the data terminal is arranged at the user side and is in dual-redundancy connection with each cabin monitoring device, each comprehensive display device and the data center. The power supply module adopts a dual-redundancy design, adapts to two power supply systems, and meets different power supply requirements.

The invention provides a soft starting method for a high-voltage variable-frequency speed-regulating device. A motor is driven to be started from 0Hz, the frequency of the output voltage of the high-voltage variable-frequency speed-regulating device is increased gradually to a rated frequency from low to high, the amplitude of the output voltage is increased along with the increase of the frequency, and the rotating speed of a rotor is increased to a rated rotating speed; in an entire frequency-regulating process, a high-frequency part and a low-frequency part are formed by taking 5Hz as a critical point; a main controller is used for transmitting controlled variables, namely, voltage and frequency to a power supply unit at the high-frequency part, and transmitting controlled variables, namely, voltage, angle and the angular speed to the power supply unit at the low-frequency part. By adopting the method provided by the invention, the output voltage waveform can still be distributed in a sine form even at a very low frequency; via the low-frequency part, the carrier frequency is reduced, the pulse width is increased, and the quality of the output voltage waveform is improved; undisturbed switching between a low frequency and a high frequency is realized, needed sine waves are output in an entire frequency range, and the motor current meets requirements in the entire process.

The invention discloses a thermal power generating unit heater terminal difference self-adaptive adjusting method and device. The adjusting device comprises a temperature measuring module I, a pressure measuring module, a temperature measuring module II, a temperature measuring module III, a water level measuring module, a controller and a heater drain adjusting valve, the temperature measuring module I, the pressure measuring module, the temperature measuring module II, the temperature measuring module III and the water level measuring module are electrically connected with the signal receiving end of the controller, the control end of the controller is electrically connected with the heater drain adjusting valve, and the human-computer interaction end of the controller is electrically connected with a touch screen. According to the thermal power generating unit heater terminal difference self-adaptive adjusting method and device, upper-lower terminal difference of the high-pressure heater is collected, the terminal difference is introduced into water level adjusting control of the high-pressure heater, and the automatic adjustment of the terminal difference of the heater of the unit in a wide load range is realized; weighting comparison is performed on the respective values to obtain an terminal difference index which mainly influences the economical efficiency of the high-pressure heater, then the terminal difference index is controlled, and undisturbed switching can be realized.

The invention discloses an ultra-supercritical unit DEH system control valve redundancy control module and method. The requirements of a servo card of a million ultra-supercritical unit DEH control system for the stability, the response time and the control precision are met. The control valve redundancy control module comprises a computer, a VC1352D redundancy control module, a coil, a steam turbine control mechanism, a linear differential displacement sensor and an EPDF-SD module, wherein the VC1352D redundancy control module is used for detecting an LVDT signal; the servo system and an on-site steam turbine control mechanism form a servo follow-up system for controlling the stroke of the hydraulic servo-motor by controlling voltage/current, and control over the hydraulic servo-motor is achieved, so that the steam inlet amount of a steam turbine is changed, and output power adjustment of the steam turbine is achieved. The running states of a main card and a standby card of the VC1352D redundancy control module can be monitored in real time, effective control over a steam turbine control valve is guaranteed, and undisturbed switching of servo cards is achieved.

The invention provides a method and a system for realizing dual-machine hot standby of a WEB browser. The method comprises the steps that a main node server and a standby node server are arranged in the same cluster and connected, the standby node server is arranged to back up data of the main node server, and when the main node server breaks down, the standby node server is started to achieve a WEB browser; The system comprises a cluster setting unit, a main node server setting unit, a transmission port setting unit, a standby node server setting unit, a main node server judging unit and a WEB browser configuration modifying unit. Dual-computer hot standby of the WEB browser is achieved, a program can be switched to the standby node server to operate when the main node server breaks down,and the functions of undisturbed switching and fault transferring are achieved; The functions of data backup and remote information checking can be achieved through the WEB browser, and a good solution is provided for a user to grasp remote equipment information in real time.