Automatic stability violation prevention

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 3. Protection and automation

Automation and telemechanics. Automatic stability violation prevention

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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3.3.72. Devices for automatic prevention of disturbances in the stability of power systems should be provided depending on the specific conditions of the grid, where it is technically and economically feasible, to maintain dynamic stability and ensure the standard margin of static stability in post-accident modes.

Automatic buckling prevention devices may be provided for operation in the following cases:

a) disconnection of the line without damage, as well as in case of damage as a result of single-phase short circuits during the operation of the main protection and the APV in possible modes of increased power transmission load and in network repair schemes; it is allowed to use automation devices in case of these damages and in normal schemes and modes of the power system, if the violation of stability as a result of automation failure cannot lead to the loss of a significant part of the load of the power system (for example, due to the action of the AFC);

b) disconnection of lines as a result of multi-phase short circuits during the operation of the main protection in normal and repair circuits of the network; it is allowed not to take into account the most rare modes of increased power transmission load;

c) circuit breaker failures with breaker failure during short circuit in the normal mode of operation of the power system and in the normal operation of the network;

d) complete separation of the power system into non-synchronously operating parts of power transmission lines in normal mode;

e) a significant emergency shortage or excess of power in one of the connected parts of the power pool;

f) operation of BAPV or AR devices in the normal scheme and mode.

3.3.73. Automatic stability control devices can affect:

a) turning off part of the generators of hydroelectric power plants and, as an exception, generators or blocks of thermal power plants;

b) a rapid decrease or increase in the load of steam turbines within the capabilities of thermal power equipment (without subsequent automatic restoration of the previous load);

c) disconnection (in exceptional cases) of a part of the load of consumers who easily endure a short-term interruption of power supply (special automatic load disconnection);

d) division of energy systems (if the above measures are insufficient);

e) short-term rapid decrease in the load of steam turbines (with subsequent automatic restoration of the previous load).

Devices for automatic prevention of stability disturbances can change the operation mode of longitudinal and transverse capacitive compensation devices and other power transmission equipment, such as shunt reactors, automatic generator excitation regulators, etc. Reducing the active power of power plants in case of damage according to 3.3.72, paragraphs. a and b, it is desirable to limit it to the volume and mainly to those cases when it does not lead to the action of the AFC in the power system or to other adverse consequences.

3.3.74. The intensity of control actions supplied by devices for automatically preventing stability violations (for example, the power of generators to be switched off or the depth of unloading of turbines) should be determined by the intensity of the disturbing effect (for example, the reset of the transmitted active power in the event of a short circuit and the duration of the latter) or the transient process, fixed automatically, as well as the severity of the initial regime, fixed also automatically or, in exceptional cases, by the personnel.

See other articles Section Rules for the installation of electrical installations (PUE).

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