SU653676A1 - Method of automatic regulation of voltage in electric circuits - Google Patents

Description

The invention relates to the field of automating the operation of power systems and is used to automatically control the voltage of a communication transformer of power systems.

There is a method of regulating the voltage of transformers in closed electric networks, according to which their voltage is regulated depending on the network voltage and their active and reactive current 1. With this method of regulation, a significant increase in both active and reactive current in the line x distribution network connecting transformers.

Closest to the proposed method and therefore adopted for the prototype is the method for controlling the voltage of a communication transformer, described in 2.

In this method, a combination of a software voltage regulating device under load and a function converter connected in series with it is used. A functional converter introduces an automatic voltage regulator into the circuit of the measuring organ.

an additional transformer of the communication transformer, proportional to the reactive current of the communication line going to the side of the nearest node with generating sources or other communication transformers of the high voltage power grid system (for example, 110 and 220 kV). This voltage, proportional to the reactive current of the communication lines, is introduced in series to the mains supply in the circuit of the measuring unit of the regulator of the communication transformer.

The known method can be applied in those cases when the link of the power system with an adjustable communication transformer goes off the communication line, and goes directly to the adjacent power supply nodes, with insignificant interim loads. However, if there are large and time-varying intermediate loads on the outgoing lines, the known method cannot be used, since the automatic regulator made by the known method} will not react to significant changes in the power of the load elements of the power system, which significantly reduces the efficiency of the mode of operation of the electrical network. Thus, the described method has a rather limited application.

For regulation, the reactive current of the communication transformer and the reactive currents of the load consumers connected to the terminals of the above-mentioned transformer of communications are used as controlled parameters, the phase of the EMF proportional to the reactive current of the transformer, and the phases of EMF proportional to the reactive current up.m. load consumers, are opposite to the phase emf proportional to the mains voltage. The proportionality coefficients of the aforementioned EMF are determined from the optimization calculations of the electrical network.

The purpose of the invention is to improve the efficiency of the electrical network mode.

This is achieved by measuring the reactive current of the communication transformer and the reactive current of load elements connected to the electrical network node, carrying an emf proportional to them with proportionality coefficients determined from ontimization calculations of the electric network, is summed with the emf proportional to the voltage network, and the phase voltage, proportional proportional to the reactive current of the communication transformer, coincides, and the phase of the emf is proportional to the reactive current of the unit load cells, and the opposite / southern phase voltage network, n depending on the amount ioluchennoy performed re1ulirova1 s nanr voltage traisformatora bond.

The drawing shows a diagram of the electrical network node and a block diagram, which is an implementation of the proposed control method.

It contains a communication transformer 1 of two voltage electrical networks, a regulator of measurement with a measuring power supply 2, a functional converter 3, which converts a reactive current into an EMF, for example, a single load consumer in a node, a functional converter 4, which transforms the reactive current of the communication transformer 1 into the emf.

The proportionality coefficients between the emf at the output of the functional transducers and the reactive currents are selected according to the magnitude of the coefficients of the equation, between the elements of which there is a linear relationship determined from the optimization modes on the digital computer:

p i-klg1 with:)

where: and is the voltage, is proportional to the voltage of the network;

Up is the voltage introduced into the voltage measuring body 2;

TO,; K - nosto | Ts51e regressive coefficients determined by static analysis of a large number of optimization modes;

:,

- reactive current transformer

connection;

I

- reactive currents of load elements. drawn to the node electrical network.

The operation of the automatic control of the communication transformer in accordance with the proposed method is as follows.

If the load on the transformer of the coupling of the reactive power becomes too great, the voltage at the output of the converter 4 will be in phase with the mains voltage. The measuring authority of the regulator 2 will perceive this as an advanced nanoscale and will allow the testing of a control action aimed at increasing the transformer ratio of the communication transformer 1. This will reduce the voltage on the pinched power grid and unload the transformer.

If the load on the node consumers increases, then the phase of the output generator of the functional converter 3 becomes the countercurrent. Southern phase voltage of the network. This will be measured by opiaHOM regulator of torus 2 as a decrease in voltage, resulting in a change in the coefficient of trans (connection transformer coupling 1 to the side of the terminal, the voltage on the mains power supply busbars will increase and the transformer will be charged with additional reactive power Thus, the loading of the communication transformer will be adjusted to the load of the consumers of the node.

In addition, in the dong box, each node is a leader with respect to its neighboring nodes. For example, if in some node the voltage in the riHTaiomeA network decreases, its communication transformer is additionally loaded with reactive power and the measuring unit of voltage regulator 2 perceives this as a mismatch of the load of the transformer with information of the transformer 1, which comes from the functional converter 4 and from the functional converter 3. As a result, the voltage regulator 2 will come into effect and will reduce the load on the communication transformer, i.e. the reduction of the voltage in the node of the supply network energosiste.my. The opposite action in the neighboring node will lead to a similar JVIy action in the node. This makes it possible, by special control of a single node, to simultaneously bring into correspondence with it a number of adjacent nodes without special control.

I edited method allows to ensure the operation mode of the electrical network node close to optimal.

Claims (2)

1. “New in electrical equipment of the stations and networks - SEI, 1961. p. 202-224. 2.Assignment of the SS certificate (DL 432633, class H 02 J 3/12,