SU983894A1 - Device for distributing load wetween two parallel-connested generators - Google Patents

Description

(54) DEVICE FOR LOAD DISTRIBUTION

BETWEEN PARALLEL-WORKING GENERATORS

T2

The invention relates to electrical engineering, in particular, to load distribution devices for parallel generators of alternating and permanent TSAC, and can be used for parallel operation of generators of mobile electrical units and power plants.

Devices for uniform (proportional) load distribution between parallel-operating AC generators are known, including load meters that measure load quantities, equalizing connections between load meters, sensing elements for detecting disparate outputs of load meters, amplifiers, and servo controls for primary drives. engine generatorsS1

There are known devices and methods for loading between parallel-working cyme-generators, based on identifying a generator with an extreme load and subsequent unloading (load) or limiting the load at a nominal level of 2.3.

The disadvantage of these devices is their complexity and, as a result, low reliability.

The closest technical solution to the invention is a device for distributing the load between generators operating in parallel, containing a load parameter relay according to the number of generators 10 with closing and opening contacts, equalizing connections, load mode control units of the generator in the direction of decreasing and increasing the load, the inputs 15, which are associated with equalizing compounds using the indicated contacts.

This device provides the loading of one generator to the nominal

20 loads and the rest of the generator in the mode of synchronous compensators, if the load does not exceed the rated power of one generator.

With a further increase in the load, the relay is activated and the load is divided equally between the two generators or with the help of equalizers. Then, if the relay operates at the second generator, the load is shared between one third of the generators, etc. Such regulation. provides the greatest efficiency of a power plant when rotating generators oj of constant-speed drives of a 5J aircraft. However, using this device in mobile electric power industry, where diesel engines are mainly used as primary engines (units that have a parallel pa6oTtii mode) are difficult for : a) long-term operation of a diesel engine with a generator not loaded is undesirable (the diesel generator cannot operate in the synchronous compensator mode); b) loading the load on two generators operating in parallel, one of which is loaded, and the other does not, will cause a double dip in the frequency of load redistribution, with the possibility of a diesel tipping over — the overloaded diesel turns to zero, c) it is difficult to manipulate the switches, since in most cases, there is no common generator generator control; d) the need for a large number of wires for equalizing connections (five wires for distributing only the active load); e) since electrical units can be dispersed from each other over a distance of up to 100 m, the presence of just one DC source violates the autonomy of the units. The determining parameters of mobile electrical units and their components are reliability, ease of operation, and autonomy. The meters of the generators with mismatch amplifiers, combined in a closed system, reduce the reliability of the energy center and are required for service, maintenance and repair of highly qualified specialists. I The purpose of the invention is to simplify and improve reliability. This goal is achieved by the fact that in the device for distributing the load between parallel-running generators, containing a load parameter relay according to the number of generators with closing and opening contacts, equalizing connections, load mode control units of the generator in the direction of decreasing and increasing the load, the power inputs of which are connected with equalizing connections using the indicated contacts of the load parameter relay, and the power supply, equalizing connections are made of three wires, the source The power supply is made in the form of independent sections according to the number of generators, the first disconnecting contact of each relay is connected between the first and second equalization connections, the second between the third equalization connections and the input of the load mode control unit in the direction of increasing the load, the first closing contact. , a relay is connected between the second and third wire equalization connections, the second between the third wire equalization connections and the power input, the load mode control unit in the direction of load reduction, and each power supply section is connected between the power output of the load mode control units and the first equalization wire. The drawing shows the electrical circuit of the proposed device. The device contains maximum electrical relays 1 of the load parameter, for example, total current, according to the number of generators with closing and opening contacts 2-5, control units of the load mode of the generators, containing the power supply reduction relay 6 (generator unloading) and the power supply increase relay 7 generator loading), independent sections 8 of the power supply of the control units, equalizing connections between contacts 2 and 3 of relay 1. Equalizing connections together with elements 2-8 form fixations neo otherness state relay 1. The apparatus operates as follows. If the generators are less or more than the nominal load, all the relays are in the same condition and the voltage from sections 8 to their control units does not pass through the series-connected contacts 2 and 3 and therefore there is no secondary regulation. The load is distributed by the primary regulators. When the relay 1 is not the same, for example, the relay at the left unit is turned on, the voltage from section 8 of the direct current source through the closed disconnecting contacts 2 of the middle and right units and the closed closing contact 3 of the left unit is fed to the moving contacts of the second switching contacts of relay 1. At the left unit, relay b will turn on and it will begin to unload, while at the middle and right unit relay 7 will turn on and they will start to load. As soon as the load of the left unit becomes its nominal relay 1 is disconnected and the redistribution of the total load between the units stops. With a further increase in load, the device will again redistribute

load. (it will load up underloaded units) and so on until the total nominal capacity of the units has been issued. After that, the device will disable the secondary regulation and the primary regulation is performed.

Thus, the proposed device makes it possible to refuse complex unreliable closed systems of load balancing at any value of the total load, to ensure the short duration of the device operation, to reduce the possibility of realignment during the redistribution of the total load or malfunctions. All this increases the reliability of the electrical units during parallel operation.

If generators are equipped with equalizers of reactive loads, then a hollow current can be used as a parameter of active power. If the device is used with direct current generators, the control unit must act on the excitation of the generators.

. The pick-up setting of the maximum electrical relays can be selected, and at loads lower than the rated power of the generators. The power supply may be AC.

Claims (5)

 1. Lukin II, Lyubimov V.V. Power supply systems for airplanes and helicopters. M., Transport 1970, pp. 1778-179. , 2. Copyright certificate CCI 508858, cl. H 02 J 3 / 46.1972. 3. USSR author's certificate number 536566, cl. H 02 3 3/46, 19.72. 4. USSR author's certificate 0 No. 629590, cl. H 02 3 3/46, 1976. 5. USSR author's certificate №528663, cl. H 02 3 3/46, 1974. , and Ll