| 摘要 |
FIELD: thermal engineering; control of power units operating at rated and set pressures of main steam. SUBSTANCE: method for controlling power unit 1 involves variation of steam flow to turbine from steam boiler by varying carrying capacity of turbine governing element through correction of boiler operation setting signal or varying carrying capacity of bypass valve depending on heat cycle of power unit. When power unit 1 is running under variable steam pressure, carrying capacity of control element 4 of turbine 3 is varied according to control signal which is sum of two signals, first of them being equal to sum of desired value of control element carrying capacity and speed deviation of turbine 3; and second signal, equal to detected third signal equal to sum of inverted first signal, signal proportional to steam pressure deviation from desired value, and signal equal to integrated sum of limited proportional third signal and steam pressure deviation signal from desired value; third signal is used as control signal for bypass valve or for setting variation of boiler operating conditions. During starting period, desired value of steam pressure downstream of boiler is built up depending on starting time and actual steam pressure. EFFECT: improved accuracy of controlling steam conditions at variable steam pressure; enlarged functional capabilities due to provision for automatic starting conditions. |
