SU117947A1 - Voltage regulation method on electrical station tires - Google Patents

Description

Methods are known for regulating the voltage on the buses of an electrical station using a reactive load distributor between operating generators acting on the excitation controllers of individual generators and the central voltage regulator connected to the station buses.

The peculiarity of the proposed method, which makes it possible to realize the most economical distribution of the reactive load between these generators, is that the central voltage regulator simultaneously affects the reactive load distributor, and the control over the reactive load of individual generators is controlled by measuring their reactive current.

In order to provide the possibility of regulating the voltage on one of the power plant systems having several bus systems of different voltages, it is proposed to set the central voltage regulators and the reactive load distributor on each power plant system so that the voltage regulators only affect the generators, connected to this system of tires, and distributors of reactive load-on all generators of the power plant.

FIG. Figures 1 and 2 show the structural diagrams of a device for insolvency of the proposed method of automatic voltage regulation at an electrical station having one bus system or, respectively, two systems of different voltages.

The device (Fig. 1) contains the scheme of the primary connections of the power station and the automatic control equipment. The primary connection scheme consists of two generators / {G-1 and G-2), their exciters 2, busbar system A, transformer 3, voltage, women, transformers

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current 4 and voltage 5 generators. The automatic regulation equipment includes: a central voltage regulator, consisting of a meter 6 for voltage deviation and a voltage regulator 7; meter 5 of the actual reactive load power; reactive load distributor 9; an execution unit 10 controlling a load balancer; an actuator //, summing the effects from the meters b and 5 and from the distributor 9 and controlling the installation resistor 12 of the automatic excitation regulator 13.

In the voltage deviation meter 6, the actual voltage in women is compared with the specified one.

When the voltage deviates from a predetermined value (for example, when lowering), a voltage appears at the output of meter 6, the magnitude of which and the sign correspond to the magnitude and sign of the voltage deviation. This voltage is applied to the executive units 10 and 11. The executive unit 10 amplifies the received effect and, in turn, acts on the reactive load distributor 9, which, integrating the time applied to it, changes (in this case increases) in proportion to Higher than the integral function is the task of recruiting reactive load to generators. The distributor 9 changes the reference as long as there is a control signal at its input.

Aggregate execution units 11, in which the effects from the meters and 5 and from the distributor 9 are added and amplified, in turn, act on the electric motor of the installation rheostat 12, the latter biases the characteristic of the excitation regulator 13, which changes the excitation current and, therefore, the reactive power given off by the generator and the voltage at its terminals.

The most advantageous distribution of reactive load between generators is provided by dialing in distributor 9 economic characteristics (characteristics of the relative increase in the cost of electricity from reactive load power).

To prevent generator overload, limiters may be provided in the distributor 9.

When rag power generators of the same type are installed at the power plant and they all operate on the same bus system directly or through similar transformers of the same type, a reactive current meter can be used instead of the meter 8 of reactive power.

In a power station where the conditions specified above are met and the active load of which is distributed equally between generators (for example, as in hydroelectric power plants), an economically advantageous distribution of reactive load between generators can be carried out over the full currents of the generators.

The device (in Fig. 2) contains the scheme of the primary connections of the power station, consisting of two generators 1 (G-1 and G-2) with their drivers 2, working through step-up transformers MA and 14B pa two systems L and automatic equipment control similar to that shown in FIG. 1. A distinctive feature of the scheme (Fig. 2) is that there are two sets of station-wide devices at the station — according to the number of working systems.

When a change in, for example, an increase in the reactive power consumption on tires A, the voltage on the latter decreases against the voltage deviation given by the setting unit 7l and the output voltage meter 6 appears voltage (current) aimed at increasing the excitation of the generators. This voltage is applied to both the aggregate execution units // and the execution unit UDD of the distributor Rd.

load. The latter increases the setting of the reactive load on the generators is not the same, but in accordance with the characteristics of the relative increase in losses (cost of electricity) relative to the bus system A. Generator G-1, associated only with the bus system A, the task is given to a greater load than generator G- 2 associated with both tire systems.

This leads to an increase in voltage on buses A. If, as a result of the increase in excitation on generator G-2, the voltage on tires B increases above the value specified by the block 7s, then the output voltage deviation (current) at the output of the BS meter, aimed at reducing the excitation of the generators, supplied both to the aggregate execution units 11 and to the execution unit YB of the load distributor 9B. The latter also gives out not identical tasks for reactive load to generators, and in accordance with their characteristics relative gains losses relative to the busbar system B, the generator G-2 is given a greater load than the generator G-1.

The ratios of the varying degree of generators in the coverage of reactive loads from different tire systems are determined on the basis of the economic characteristics acquired in the EA and EB distributors, ensuring their minimal losses from reactive power flows and minimal reactive power flows between the tire systems. With a change in the composition of the working aggregates, these ratios may vary.

The automatic control system comes to equilibrium when the voltage on both bus systems is equal to the specified one, and the distribution of the reactive load between the generators and the generators will correspond to the most advantageous, specified by the 9A and 9B load distributors.

Similarly, a control system is constructed with any number of working tire systems in a power plant.

Subject invention

Claims (3)

1. The method of voltage regulation on the buses of an electric station using a reactive load distributor between the generators acting on the excitation regulators of individual generators and the central voltage regulator connected to the station buses, characterized in that the most economical distribution of reactive load between operating generators, the specified central voltage regulator simultaneously affects the reactive load distributor, p When in use, control of the magnitude of the reactive load of individual oscillators is performed by measuring their reactive current. 2. A variation of the method according to claim 1, characterized in that the reactive load of the generator is monitored by measuring its total current. 3. Method according to paragraphs. 1 and 2, characterized in that, in order to be able to control the voltage on one of the power plant bus systems having several bus systems of different voltages, central voltage regulators and reactive load balancers are installed on each power plant bus system, and the voltage regulators Wives only affect generators attached to this tire system, and reactive load distributors affect all generators of the power plant. - 3 - # 117947 on