SU752616A1 - Apparatus for emergency limiting of power-system power - Google Patents

Description

one

The invention relates to the automation of power systems and can be used to control power plants in the event of an emergency situation in the power system.

A device is known for emergency limitation of the generating power of a power system, which provides the required limitation by the effect of shutting down the generators or unloading the turbines of one of the power plants. However, the discharge range of power plants may not be sufficient to implement the required power limit.

The closest solution to the technical problem is a device for emergency power system power limitation, containing a unit for setting the required unloading and transmitting unloading signals at the station and providing for the impact on several power plants.

In this device, due to the hard coupling of the output of the task block to the transmitter inputs, the power limit of each station is matched to the total power limit.

Thus, the following relation is realized,

2,

ii

where AR is the required power limit

power systems; - part of the power limit,

realizable at the / -th station; Ki is the weighting factor that determines the part of the power constraint implemented at the i-th station.

However, in the known device there is no dependence of the weighting factor on the magnitude of the task and values of the discharge ranges of individual stations.

drdol

For example, when limiting the power of three stations, it is preferable to limit the power of the first station, less preferably limit the power of the second station, and limit the power of the third station even less preferably.

When the value of the AP exceeds the sum of the unloading ranges of the first and second stations, it is advisable to firstly involve a significant amount in limiting the power of the third station. This may occur when, at the first two stations, power limiting is performed by exposure

for unloading turbines, and at the third station by turning off the generator.

This means that the power limitation must be carried out taking into account the determined priority, which can vary depending on the PD and.

In the known power limiting device, the realization of the desired priority is impossible and the distribution occurs depending on the selected coefficients / Ci simultaneously and unambiguously to all stations.

The purpose of the present invention is to increase the accuracy and selectivity of unloading stations. This goal is achieved by the fact that in a known device for emergency power system power limitation, which contains a unit for setting the required unloading and transmitters for unloading signals at the station, an adder, an integrator, a task distribution unit and an offset unit are entered, the totalizer inputs are connected to the output of the required unloading unit with the outputs of the task distribution blocks, the output of the adder is connected via an integrator to one of the inputs of the task distribution blocks, the second inputs of which through the offset block are connected us to the output unit specifying a desired unloading, and outputs the distribution setting unit to transmitters .iodklyucheny discharge signals.

FIG. 1 shows a block diagram of an apparatus for emergency power system power limitation; in fig. 2 is a timing diagram of the voltages at the outputs of the individual units of the device at various values of the required power limitation of the RT, where a is the output of the task block; b - integrator output; in - output adder; g, d, e — outputs of distribution units.

The device for emergency power supply of the power system contains a task block 1, which calculates the required unloading, connected to the adder 2, the output of which through the integrator 3 is connected to the task distribution blocks 4. The outputs of the task distribution blocks 4 are connected to the inputs of the unloading signal transmitters 5, as well as to the inputs adder 2 for transmitting negative feedback signals. In addition, the additional inputs of the task distribution unit 4 are connected to the offset unit 6.

The bias signals prioritize unloaded stations.

When an emergency situation occurs in the system, a voltage signal appears at the input of the adder 2, proportional to the required unloading of the DR. This signal is fed to the input of the integrator 3, which processes it. The output signal from the integrator 3 is fed simultaneously to the inputs of the distribution units 4.

However, the signals at the outputs of the distribution unit of task 4 appear sequentially depending on the magnitude of the bias voltage, which are formed by the bias unit 6, taking into account the required power limit and unloading ranges of the stations.

At the point in time that takes place

equality

DR p: i U.PI

I

input request processing is terminated.

Thus, the described structure realizes the distribution of unloading stations in accordance with the following dependency;

d,

25 where

Ki f (P, Pr}.

This ensures accurate distribution of the total power limitation between individual power plants with maximum utilization of the adjustment capabilities of the power plants, the discharge of which is most preferable, which allows reducing damage to the power system from emergency power limitation.

Claims (1)

Invention Formula A device for emergency limitation of power of the airsystem, containing a unit for setting the required unloading and transmitters of unloading signals at the station, characterized in that accuracy and selectivity of unloading stations; an adder, an integrator, a task distribution unit and an offset unit are entered in it, the adder inputs are connected to the output of the required unloading task block and the outputs of the task distribution blocks, the adder output is connected through one integrator to one of the inputs of the task distribution blocks, the second inputs of which are connected through the bias unit to the output of the unit for specifying the required unloading, and the outputs of the unit for assigning the task are connected to the transmitters of the unloading unit.