SU752610A1 - Apparatus for connecting two power systems - Google Patents

Description

two asynchronized synchronous machines with rigidly connected shafts, the stator windings of which are connected separately to power systems, as well as adjustable frequency converters, a shaft speed meter and excitation regulators, one of the inputs of which is connected to a velocity meter, and the output of excitation regulators is connected to controlled by the frequency converter of each of the machines, adders are entered one by one into the control circuit of each asynchronized machine. These adders are made on the basis of direct-current operational amplifiers with deep negative feedback, the input of which is connected to the sensors of the frequency of the power plants of the interconnecting power systems, and the output is connected to the second input of each excitation controller.

The drawing is a diagram of the proposed device.

The device for communication of two power systems 1 and 2 consists of two asynchronized synchronous machines 3 and 4 with rigidly connected shafts. The windings of the rotors of machines 3 and 4 are connected via controlled frequency converters 5 nb to the stator prices of asynchronized machines 3 and 4, i.e. with power systems 1 n 2. Signals from the excited regulators are fed to the input of controlled frequency converters 5 and 6 7 n 8. The inputs of excitation regulators 7 and 8 receive signals from the meter 9 of the shaft rotation speed and from the adders 10 and I, made on the basis of operational amplifiers of constant current with deep negative feedback. The inputs of the adders 10 and I receive signals from the frequency sensors on the buses of each power plant of the connected power systems 1 n 2.

The operation of the device for the connection of two power systems 1 and 2 is based on the compensation of the electromagnetic inertia of the rotors of asynchronized synchronous machines 3 and 4 and the power supply of the excitation circuits of these 3 n 4 machines with voltage

(Of: tOg

R

2 // “; ( one

- equivalent frequency;

Shee

P

; one

the frequency of the i-th power station of each of the connected systems; the moment of the interception of the t-th power station;

rotor speed;

voltage frequency.

attached to rotor windings; l - the number of power plants in one of

united power systems.

Using adders 10 and 11, a signal is generated that corresponds to the equivalent frequency soe in accordance with the above formula, and together with the summation is multiplied by a constant factor equal to the inverse of the total moment of inertia of the power plants of the connected systems. The signal from the output of adders 10 and I is fed to the input of the excitation regulators 7 and 8, to the other input of which signals are received from the meter 9 of the shaft rotation speed. In regulators

excitation 7 and 8, a signal is generated that corresponds to the difference between the equivalent frequency and shaft rotation frequency and controls frequency converters 5 and 6, with which power is supplied to the prices of the rotors of synchronized machines 3 and 4.

The efficiency of the proposed device is determined by introducing into the control system of asynchronized machines the equivalent frequency of the connected power systems, which is formed in adders. This may allow continuous adjustment of the control actions depending on the actual state.

the systems to be combined as a whole does not address the issues of the inhibition of dynamic stability of the intersystem line, and the dynamic stability of the whole energy combination rises to 100% if the slip between the power systems lies within the range allowed by the parameters of the asynchronized machines of the device for communication.

Claims (1)

Invention Formula A device for communicating two power systems containing two asnnchronized synchronous machines with rigidly connected shafts, the stator windings of which are connected to the respective power systems, frequency sensors of power systems controlled by a frequency converter, a shaft rotation speed meter and excitation regulators, one of the inputs of which connected to a speed meter, and the output of the field controllers is connected to a controlled frequency converter of each of the machines, characterized in that, in order to increase its dynamic stability, it is equipped with adders, the input of each of which is connected to the frequency sensor of the corresponding power system, and the output is connected to the auxiliary input of the corresponding excitation controller.,