394 results about "Response capacity" patented technology

The invention discloses a method for coordinating and controlling quality change of coal in a supercritical once-through boiler unit. The method is used for building a boiler master control provided with balanced indirect energy, and comprises the following steps: quantifying coal quantity by load; quantifying primary air quantity by the coal quantity; confirming a dominant role of instructions of the boiler master control; jointly debugging the ratios of wind, water and coal to ensure that the superheat degree of the boiler meets the requirement; meanwhile, ensuring the control precision of the front pressure of the boiler unit to meet the requirements of a power grid for changing range and speed rate. The method mainly solves the problem that the unit runs fast while the boiler efficiency is low, and builds a novel static feedforward, a load dynamic feedfoward, a pressure dynamic feedforward, and dynamic corrections of the feedforwards based on quality change of coal; the linkage of wind, water and coal quickens the responsiveness of the boiler; the joint debugging of water and coal solves the problem of quality change of coal, realizes the decoupling of water and coal and the decoupling of main steam pressure and superheat degree; the linear real-time coefficient modifies various experience curves; and a main steam pressure regulator of the boiler master control is subjected to the variable parameter control.

The invention discloses a multidirectional evacuating device for die-casting, which comprises a vacuumizing unit and a vacuum control system. The vacuumizing unit comprises a vacuum pump, a vacuum tank, a cavity bleed-off passage, a pressure chamber bleed-off passage, die set bleed-off passages, a vacuum valve and electromagnetic valves; the cavity bleed-off passage is formed by a pipeline connected between the vacuum tank and the vacuum valve; the pressure chamber bleed-off passage is formed by a pipeline between the vacuum tank and a pressure chamber; each die set bleed-off passage is formed by a pipeline between the vacuum tank and a die set of a die-casting die; each die set bleed-off passage is provided with one electromagnetic valve; and the vacuum control system is used for acquiring information of each pressure sensor and each humidity sensor and switching on or switching off the corresponding electromagnetic valves according to external die-casting signals so as to switch on or switch off the corresponding bleed-off passages and control the vacuum degree of the die-casting die. According to the invention, the vacuumization is simultaneously carried out from three directions of a cavity, the pressure chamber and the die set; the evacuating rate and the evacuating efficiency are greatly improved; and an IPC (Industrial Personal Computer) is adopted to control, so that the high-speed dynamic response capacity and the data storage capacity of the detection are improved.

The invention provides a direct power control method of a voltage source PWM (pulse width modulation) rectifier system. Based on an inner-loop power and outer-loop voltage control method adopted in a DPC (data processing control) method, set values of active power and reactive power are compared with actual values, and a voltage vector is selected by querying a switch list to control the on-off state of the PWM rectifier. According to the control method provided by the invention, a state variable marking the active power and the reactive power is added, the location of a space vector is redefined and a segmented switch list is constructed, thus enhancing the decoupling control on the active power and the reactive power and the response capability, and improving the power factor of the rectifier. The calculation and experiment results show that the grid side input current is sine and the instantaneous power dynamic and static control characteristics of the system are better.