HollySys launched an integrated set of solutions covering the entire plant to build a new generation of digitized power plants and accelerate the power industry's informatization. The solutions effectively control and protect main and auxiliary equipment throughout the entire process of boilers, turbines, auxiliary engines, desulfurization, denitrification and more. HollySys also provides improved control algorithms to optimize boiler combustion efficiency, thus improving the comprehensive utilization efficiency of primary energy and reducing pollutant emissions. Fujian Hongshan's 1000MW ultra-supercritical coal-fired generating unit control system is provided by HollySys. This is currently the largest thermal generating unit project with the most powerful control capacity in China designed with fieldbus technology. The HollySys control system provided to the Hequ Power Plant of CHN Energy Shenhua Group successfully controls a supercritical circulating fluidized bed. Meanwhile, HollySys has numerous successful cases in the control of power plant isolated network operation. HollySys is a leading supplier for the large-scale power generation enterprises such as China Shenhua Energy Company Limited, Datang Telecom Technology & Industry Group, State Power Investment of China, China Huaneng, Huadian Power International Corporation Limited, and State Grid Corporation of China. HollySys is committed to providing new energy solutions for such projects as solar thermal power and waste-to-energy projects. HollySys has complete integrated solutions for co-generation, integrated energy network control, and energy-saving optimization for electricity, heat, and cooling.
The Automatic Power Plant Startup and Shutdown System (APS) is the generating unit's automatic startup and shutdown information control center. As such, it can issue startup or shutdown commands to each piece of equipment or each system according to the formulated procedures, to achieve the unit's automatic startup or shutdown in coordination with the Coordinated Control System (CCS), Analog Automatic Control System (MCS), Boiler Furnace Safety Surveillance System (FSSS), Turbine Digital Electrohydraulic Control System (DEH), Boiler Steamer Sequence Control System (SCS), Feedwater Control System to Entire Process, Burner Load Program Control System and other control systems (ECS Electrical Control System, AVR Automatic Voltage Regulation System, etc.).
The boiler-turbine coordinated control system synchronizes the boiler, steam turbine and related auxiliary turbines, allowing them to load commands from the central regulator or operator in a quick, accurate and steady manner, enabling the unit to generate the power required. The system consists of a generating unit load management center, a pre-machine pressure setting circuit, the main controller for the boiler, the main controller for the steam turbine, an RB function, a primary frequency regulation function, and other circuits. As for the direct command balance control strategy, which is used for DC boilers exhibiting hysteresis, nonlinearity and strong coupling characteristics, it establishes respective models of load-feed water, load-fuel, load-turbine valve adjusting, pressure-feed water, pressure-fuel, pressure-turbine valve adjusting, enthalpy-feed water, enthalpy-fuel, and enthalpy-turbine valve adjusting. Model control and state observation of each measurement point enable the models to resolve the issue of strong coupling between multiple system inputs and outputs, thus achieving precise control of load, pressure, and temperature.
The HollySys Auxiliary Network Control Solution is designed to control power plants' auxiliary systems such as coal transfer, water production, and ash removal. It has a one-touch start function upon selecting the equipment to complete the start-up process automatically. The solution offers a comprehensive mechanism for safe and logical interlocking. The entire start-up process does not require manual operation. The HollySys Auxiliary Network Control solution realized transparent cross-system operation. In other words, operators do not need to log out and log back during systems switching (between water, ash and coal). Instead, as long as one owns permission, one can execute cross-system monitoring and operations. In addition, switching between monitoring interfaces within a single system requires simply one or two clicks of the mouse, while switching across systems needs no more than three clicks.
