FIELD: control equipment for power plants with automatic regulation of level of liquid (for example, water). SUBSTANCE: method involves adding usage of liquid which enters tank and leaves it, comparison of sums of usage of liquid which enters tank and leaves it, sending this difference as signal to regulator, which outputs first additional signal, which conforms to first given function and actuates regulation valve and provides zero level of usage difference. Simultaneous method involves measuring non-balanced amount of working liquid which provides deviation of current value of level from given level, even for equal sums of usage of liquid which enters tank and leaves it, using equation 
, where G is non-balanced amount of working liquid, Q(t) is alternation of difference of sums of usage of liquid which enters tank and leaves it, t is duration of unbalance of sums of usage. Signal which is proportional to non-balanced amount is sent to regulator, which outputs second additional signal which conforms to second given function, actuates regulation valve and provides ideal following to material balance, i. e. zero of non- balanced amount of working liquid and equality of current and given values of working liquid level in tank. EFFECT: improved quality of automatic regulation and increased functional capabilities. 2 dwg
