CN202111478U

CN202111478U - Parallel grid-connected triple cogeneration control system for controlling multiple generators by using PLC (Programmable Logic Controller)

Info

Publication number: CN202111478U
Application number: CN2011201825412U
Authority: CN
Inventors: 王杏芳; 黄向东; 严新洲
Original assignee: HANGZHOU CITY ENERGY CO Ltd
Current assignee: HANGZHOU CITY ENERGY CO Ltd
Priority date: 2011-06-01
Filing date: 2011-06-01
Publication date: 2012-01-11
Anticipated expiration: 2021-06-01

Abstract

The utility model provides a parallel grid-connected triple cogeneration control system for controlling multiple generators by using a PLC (Programmable Logic Controller). The system comprises a mains supply bus, at least two generators, a load, a selective turn-on generator, a switch and the PLC, wherein the switch is used for supplying power for the load through the mains supply bus; the PLC is used for controlling starting action and stopping action of each generator through a relay array; the mains supply bus comprises a bus I and a bus II; two sections of bus inlet ends are connected with a first inlet switch and a second inlet switch of a mains supply external network respectively; a bus-bar switch is connected between the bus I and the bus II; each generator runs in parallel; a generator switch is connected between each generator and the bus I; and the PLC is used for comprehensive judgment by detecting inlet power at the mains supply switch so as to transmit a starting or stopping instruction for each generator switch. The system has the beneficial effects that: the starting or stopping of the generator is automatically controlled through PLC control; each running generator is guaranteed to run at full load; and the generated power is only used locally without being provided back for a power grid.

Description

Adopt the three alliance control system that are incorporated into the power networks side by side of many generators of PLC control

Technical field

The utility model relates to civilian electric power supply technique field, specifically is meant the three alliance control system that are incorporated into the power networks side by side of many generators of a kind of PLC of employing control.

Background technology

Common distributed energy cold, heat and power triple supply system has the restriction of " be incorporated into the power networks and do not surf the Net " on the generator connecting in parallel with system condition, though promptly generator is incorporated into the power networks with civil power, institute's electricity can only supply the one's respective area to use, and can not send to utility grid.In this case, when system load changed because of fluctuation takes place a variety of causes, generator also will constantly be adjusted generated output usually to be complementary with system, in order to avoid send electricity to utility grid, this causes as a rule, and generator can not the full load operation.According to common generator performance parameter, generator is being lower than under the full-load conditions, the situation that all exists generating efficiency to reduce, and under the situation of sending out power less than rated power 50%, generator efficiency reduces very big.

Adopt many generators of three alliances grid-connection control system strategy arranged side by side of this PLC control; Generator is moved under the full load situation all the time; Kept the optimal power generation efficient of generator effectively, this energy-conservation project can be moved under the situation of optimum fractional energy savings throughout the year.

Summary of the invention

To the above-mentioned defective that prior art exists, the utility model provides the three alliance control system that are incorporated into the power networks side by side of many generators of a kind of PLC of employing control.

The technical scheme that the utility model adopts is:

Adopt the three alliance control system that are incorporated into the power networks side by side of many generators of PLC control; Comprise civil power bus, at least two PLC that generator, load, selections are connected the switch of generator and civil power bus powering load and passed through each generator start and stop action of relay array control; Said civil power bus comprises bus I and bus II; Two sections bus ends of incoming cables connect a service entrance switch and No. two service entrance switchs of civil power outer net respectively; Leading-out terminal is connected first load and second load through first load switch respectively with second load switch, be connected with bus connection switch between bus I and the bus II; Be connected generator contactor between each generator parallel operation, every generator and bus I; PLC sends the start and stop instruction through the comprehensive judgement of the inlet wire watt level that detects the place, urban electric power switch and then to each generator contactor.

Further, generator has four, is connected with main switch between each generator contactor and the bus I.

Further, said PLC is connected with the relay array communication through the Mod-bus bus.

Can know by above technical scheme; The beneficial effect of the utility model is: through PLC control, generator start and stop control realizes control automatically, and generator is according to the big or small automatic start-stop of civil power inlet wire power; The generator that guarantees every operation is oepration at full load; Generator efficiency is the highest all the time, and the only use in this locality of institute's electricity, does not fall to supply power to electrical network.Native system adaptability is good, and is easy and simple to handle, realizes the unattended operation system from action control, can realize that generator according to the control of fluctuation of load situation automatic start-stop, satisfies the restrictive condition of " be incorporated into the power networks and do not surf the Net ".

Description of drawings

Fig. 1 is the structural representation of the utility model.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

With reference to Fig. 1; Adopt the three alliance control system that are incorporated into the power networks side by side of many generators of PLC control; The generator, civil power bus, load, the selection that comprise at least two generated output 65KW are connected the switch of generator and civil power bus powering load and are passed through the programmable logic controller (PLC) (PLC) 5 that relay array is controlled each switch motion; Present embodiment is an example with 4 generators, generator (1,2,3,4) in promptly scheming, and the civil power bus comprises bus I and bus II; Two sections bus ends of incoming cables connect a service entrance switch 6 and No. two service entrance switchs 7 of civil power outer net respectively; Leading-out terminal is connected first load 10 and second load 11 through first load switch 8 respectively with second load switch 9, first load switch 8 of present embodiment and second load switch 9 are manual plug-in strip, are connected with bus connection switch 12 between bus I and the bus II; Four generator parallel operations and with bus I between be connected generator contactor (13,14,15,16), be connected with main switch 17 between each generator contactor and the bus I, the generator contactor of present embodiment is an automatic circuit breaker; PLC sends the start and stop instruction through the comprehensive judgement of the inlet wire watt level that detects the place, urban electric power switch and then to each generator contactor; This Control Network adopts the Mod-bus communications protocol; Be that PLC passes through the Mod-bus bus and is connected with the relay array communication, relay array is not shown in the figures.

Following rule is followed in native system generator start and stop setting:

When 1) the inlet wire power at service entrance switch place is less than 90KW, do not do any starter-generator action;

When 2) the inlet wire power at service entrance switch place was also effectively kept more than 10 minutes greater than 90KW, PLC sent instruction and opens generator 1; After generator 1 full-load run and stable operation, PLC continues to detect the inlet wire power at civil power service entrance switch place, opens generator 2 if inlet wire power still greater than 90KW, then continues to send instruction, all drops into full shipping row until four generators; If during inlet wire underpower 90KW, then keep the present situation operation, PLC constantly detects city's electrical power to compare judgement.

3) the inlet wire power when the service entrance switch place reduces with the fluctuation of load gradually, and when less than 10KW, PLC sends the halt instruction of the generator of last input, to reduce generated output, makes city's electrical power remain on the state of infeeding; Behind generator outage, PLC continue to detect city's electrical power, when city's electrical power during again less than 10KW, then still sends halt instruction, all shuts down up to four generators.

4) start and stop of four generators order can be provided with adjustment, rotates successively, and is all roughly the same to guarantee every generator operation time;

Though the utility model is through illustrating and describe with reference to preferred embodiment; But those skilled in the art should understand, and can be not limited to the description of the foregoing description; In the scope of claims, can do the various variations on form and the details.

Claims

1. adopt the three alliance control system that are incorporated into the power networks side by side of many generators of PLC control; It is characterized in that: comprise civil power bus, at least two PLC that generator, load, selections are connected the switch of generator and civil power bus powering load and passed through each generator start and stop action of relay array control; Said civil power bus comprises bus I and bus II; Two sections bus ends of incoming cables connect a service entrance switch and No. two service entrance switchs of civil power outer net respectively; Leading-out terminal is connected first load and second load through first load switch respectively with second load switch, be connected with bus connection switch between bus I and the bus II; Be connected generator contactor between each generator parallel operation, every generator and bus I; PLC sends the start and stop instruction through the comprehensive judgement of the inlet wire watt level that detects the place, urban electric power switch and then to each generator contactor.

2. the three alliance control system that are incorporated into the power networks side by side of many generators of employing PLC control as claimed in claim 1, it is characterized in that: generator has four, is connected with main switch between each generator contactor and the bus I.

3. according to claim 1 or claim 2 the three alliance control system that are incorporated into the power networks side by side of many generators of employing PLC control, it is characterized in that: said PLC is connected with the relay array communication through the Mod-bus bus.