SU1372472A2 - Method of switching over synchronous generator from system with extra power to power poor system - Google Patents

Abstract

The invention relates to electrical engineering and can be used to implement the exchange of electricity between non-synchronously operating power systems through a frequency converter (IF). The purpose of the invention is to reduce the installed capacity of the inverter. For this, the generator is allocated for autonomous work through the inverter to the deficient system together with the load, synchronization of the generator with the load with the deficient system is performed by affecting the inverter and, when the synchronization conditions are met, turn on the generator and the load. Then the load is transferred back to the redundant system by allocating it to autonomous operation, synchronization with the redundant system by acting on the inverter and switching on when the synchronization conditions are met. 3 il. i SL

Description

The invention relates to electrical engineering, can be used to implement the exchange of electricity between non-synchronously operating power systems, and is an improvement of the method according to the author. No. 1206880.

The purpose of the invention is to reduce the power of the frequency converter.

Figure 1 shows the electrical connections of a power plant for logging a proposed method for switching a synchronous generator using an asynchronized electromechanical frequency converter (ASEMPC) and an electrical load; FIG. 2 shows the stage of autonomous operation of a switchable generator, AESEMF and the load necessary for synchronization of the generator; on fig.Z - autonomous operation of the load through the frequency converter from the energy-redundant system.

In the diagram (Fig. 1), the first, second and third bus sections 1-3, the bus-connecting switch 4, the switches 5-7 of the switched synchronous generator, the switches 8-10 of the electric load, the switches 11-14 of ASEMPCH, asynchronized synchronous machines 15 and 16 ASEMPCH, switchable synchronous generator 17, control device 18, excitation controller 19 and load 20.

Phased switchable synchronous generator must be transferred to the autonomous work with ASEMPCH and electrical load (figure 2). In this mode, using the property of AESHMP as a controlled element, the generator is synchronized and connected to the corresponding section of the power plant. After a joint switching of the generator and the electrical load with a frequency converter, the latter is transferred to the same bus section to which it was originally connected. For example, the switching of generator 17 from section 1 of tires (energy-efficient) to section 2 (energy-deficient) is carried out as follows.

Sections 1 and 3 of the bus are connected by turning on the busbar switch 4, turning on the ASEMPCH machine 15, synchronous generator 17 and electrical load 20 on section 3 by turning on the switches 12.7 and 10, respectively, and then turning off the switches

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0

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11.8 and 5. As a result of these operations, the switchable synchronous generator 17, the electrical load 20 and the asynchronized ASEMPCH machine 15 are connected to the bus sections 1 via the bus switch 4 only.

Translation of generator 17, electrical load 20 and machine 1 5 ASEMPCH for autonomous operation by disconnecting the busbar switch 4 (FIG. 2) with equal total power of the electrical load 20 and machine 15 ASEMPCH switchable generator power provided by the control device 18. Ensuring a balance of power in section 3 of the tires is necessary to preserve the modes of the switched generator, the electrical load and the AHEMFR when transferred to autonomous operation.

The switched generator is synchronized with the bus section 2, for which, under the action of the excitation controller 19, the ASEMPCH machine 15 and the switched generator 17, depending on the frequency difference on sections 2 and 3, change their power in such a way that the generator 17 switches to

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The new steady state with voltage and frequency values corresponding to their values on the 2 bus section.

According to the alignment signal of the voltage and the frequencies in sections 2 and 3, using a known method of switching on the generator with waiting or catching synchronism, switches 6 and 9 are switched on. After that, switchable generator I7 and electrical load 20 are connected to section 2 of the buses.

To reversely transfer electrical load 20 to busbar section 1, it is necessary to restore the original circuit when the frequency converter is used as an intersystem communication element, which is achieved by turning on the switches 11 and 12; to ensure the flow of power through the frequency converter from the energy-efficient system to the energy-deficient, equal to the power of the load 20, by the action of the control device 18; turn on the machine 16 ASEMPCH and electrical load 20 on section 3 tires by turning on the switches 14 and 10, turn off the switches 13 and 9, as a result of which the load is 20 on

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It is used for autonomous operation through a frequency converter from an energy-abundant system (FIG. 3); change, by acting on the frequency converter, the control unit 18 frequency and voltage on the busbars of section 3 before aligning with the frequency and voltage of bus section 1, turn on the bus / wiring switch 4 and switches P and 8, turn off switches 10 and 12, ending the switching process.

Claims (1)

Invention Formula The method of switching a synchronous generator from the power system with excess com power in the power system with a power deficit auth.St. 1206880, characterized in that, in order to reduce the power of the frequency converter, before switching, the excess power system load is not connected to the switchable generator buses, not exceeding its power, and after switching the generator, the specified load is separated from the deficient power system through the frequency converter, synchronized with the excess power system by acting on the frequency converter and connected to a redundant power system. M system 2 From dochinchinob To the system „Г615т77 1Ч8Н8ЬчЭ  L "1.„, L 1516J m ... "-" .v, 20 fig.Z one j20 FIG. 2 2