CN204886210U - Distributed generator access system that is incorporated into power networks - Google Patents

Abstract

The utility model provides a distributed generator access system that is incorporated into power networks, it is main including grid -connected inverter, the distributed generator access control unit that links to each other with grid -connected inverter, the low pressure of connection between distributed generator access control unit and the mains transformers the control unit that is qualified for the next round of competitions, and with the female low pressure reactive compensation control circuit that links to each other and the multichannel low pressure return circuit of being qualified for the next round of competitions of arranging of low pressure, the distributed generator access control unit passes through communication interface and connects smart electric meter control unit, low pressure is qualified for the next round of competitions loop connection and is crossed under -voltage time -delayed protection module, the utility model discloses the structure principle is simple, when improving the distribution network reliability can to and the network system real time monitoring carries out, guarantee the normal safe operation of each system, adopted under -voltage time -delayed protection module simultaneously, can accomplish that voltage recover just often can avoid the undertension with electrical apparatus and result in the damage the power supply with electrical apparatus, protection by the automatic recovery after the system trouble.

Description

A kind of distributed power source grid integration system

technical field:

The utility model relates to grid-connected field, particularly relates to a kind of distributed power source grid integration system.

background technology:

Along with the growing tension of China conventional energy resource supply and the cry of environmental protection more and more surging, the development and utilization of regenerative resource receives unprecedented attention.British government takes the lead in proposing the concept of " low-carbon economy " at its energy white paper in 2003, the Chinese government proposes the binding indicator of " energy-saving and emission-reduction " for developing " low-carbon economy ", the distributed generation technology adapted with it obtains great attention and the fast development of country.

Distributed power generation refers to: for meeting specific user's needs or supporting the economical operation of existing power distribution network, be arranged near user with distributing, generated output be the thousands of watts of small modules formulas do not waited to tens of megawatt and with the independent current source of environmental compatible.The access of distributed power generation makes the trend of each branch road in power distribution network be no longer uni-directionally flow, and therefore the introducing of distributed power generation can bring deep effect to whole electrical network.Except various forms of distributed generation technology itself still needs further research and except improving; from the angle that distributed power generation is connected with traditional electrical network, distribute for the trend containing distributed power generation, voltage stabilization, harmonic wave, short circuit current, relaying protection, a series of problems such as impact such as scheduling need to carry out deep research.

China Patent No. " 201420672453.4 " discloses a kind of distributed power source grid integration system, its advantage is: this system can as stand-by power supply for requiring that the user of uninterrupted power supply provides electric energy, ensure the reliability of electric power, and reduce electric cost expenditure, improve distribution network reliability.In addition, distributed power generation has Load Regulation ability flexibly, and start-up course only needs the time in a few second, and it is exerted oneself and can regulate by the hour; Its weak point is: cannot monitor cutting-in control service data in real time, simultaneously when the unexpected power-off of electric power system, will cause load-side neutral point excursion, can produce overvoltage or under-voltage, burn out power consumption equipment time serious.

utility model content:

In order to solve the problem; it is simple that the utility model provides a kind of principle; can monitor in real time grid-connected system while raising distribution network reliability; ensure that each system normal safe runs; automatically can recover the power supply to electrical appliance when can also accomplish that voltage resume is normal after system jam, protection electrical appliance causes the technical scheme of damage from crossing under voltage:

A kind of distributed power source grid integration system; mainly comprise combining inverter; the distributed power source access control unit be connected with combining inverter; be connected to the low-pressure line-outgoing control unit between distributed power source access control unit and city's piezoelectric transformer; and the low-pressure reactive compensation control loop to be connected with low-voltage busbar and multichannel low-pressure line-outgoing loop; distributed power source access control unit connects intelligent electric meter monitoring unit by communication interface, and low-pressure line-outgoing loop connects overvoltage/undervoltage delay protection module.

As preferably, overvoltage/undervoltage delay protection module mainly comprises rectification stable pressuring unit, performance element and single-chip microcomputer integrated circuit, rectification stable pressuring unit mainly comprises resistance A, electric capacity A and the rectification circuit of the reduction voltage circuit be unified into and diode A, diode B, diode C, diode D composition, and reduction voltage circuit also connects single-chip microcomputer integrated circuit one end by resistance B, electric capacity D, resistance G; Rectification circuit output end connects performance element respectively by diode E, electric capacity B; Performance element comprises relay, triode, transistor collector connects relay, collector electrode also contact resistance D, diode G ground connection successively, grounded emitter, base stage connects single-chip microcomputer integrated circuit one end by resistance E, and resistance E is also by resistance F, diode H ground connection; The relay other end connects single-chip microcomputer integrated circuit input by resistance C, electric capacity C, diode E; Single-chip microcomputer integrated circuit comprises timer, memory, A/D converter, comparator.

As preferably, intelligent electric meter monitoring unit mainly comprises MCU module, MCU module connects computation chip, memory module, security module, infrared communication module, RS485 communication module respectively, and MCU module also connects OFDM chip by UART interface, and OFDM chip connects main website server.

The beneficial effects of the utility model are: (1) the utility model adopts intelligent electric meter monitoring unit, for monitoring the state of solar power system, can operate each combining inverter, the OFDM chip that it adopts, anti-arrowband jamming performance is strong, can carry out communicating with main website server and transmit a large amount of energy data, can monitor in real time grid-connected system while raising distribution network reliability, ensure that each system normal safe runs .

(2) the overvoltage/undervoltage delay protection module of the utility model employing, can recover the power supply to electrical appliance automatically when can accomplish that voltage resume is normal after system jam, and protection electrical appliance causes damaging from crossing under voltage.

accompanying drawing illustrates:

Fig. 1 is systematic schematic diagram of the present utility model;

Fig. 2 is overvoltage/undervoltage delay protection module principle figure of the present utility model;

Fig. 3 is intelligent electric meter monitoring unit schematic diagram of the present utility model.

embodiment:

For making goal of the invention of the present utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, execution mode of the present utility model is described in further detail.

As shown in Figure 1, a kind of distributed power source grid integration system, mainly comprise combining inverter 1, the distributed power source access control unit 2 be connected with combining inverter 1, distributed power source access control unit 2 comprises isolating switch, current transformer group and circuit breaker, be connected to the low-pressure line-outgoing control unit 4 between described distributed power source access control unit 2 and city's piezoelectric transformer 3, low-pressure line-outgoing control unit 4 comprises circuit breaker, current transformer group, and the low-pressure reactive compensation control loop 6 to be connected with low-voltage busbar 5 and multichannel low-pressure line-outgoing loop 7, low-pressure line-outgoing loop 7 comprises circuit breaker summation current transformer group, distributed power source access control unit 2 connects intelligent electric meter monitoring unit 9 by communication interface 8, low-pressure line-outgoing loop 7 connects overvoltage/undervoltage delay protection module 10.

As shown in Figure 2, overvoltage/undervoltage delay protection module 10 mainly comprises rectification stable pressuring unit, performance element and single-chip microcomputer integrated circuit 11, rectification stable pressuring unit mainly comprises resistance A1a, electric capacity A1b and the rectification circuit of the reduction voltage circuit be unified into and diode A1d, diode B2d, diode C3d, diode D4d composition, and reduction voltage circuit also connects single-chip microcomputer integrated circuit 11 one end by resistance B2a, electric capacity D4b, resistance G7a, rectification circuit output end connects performance element respectively by diode E5d, electric capacity B2b, performance element comprises relay 12, triode 13, triode 13 collector connection relay 12, collector electrode also contact resistance D4a, diode G7d ground connection successively, grounded emitter, base stage connects single-chip microcomputer integrated circuit 11 one end by resistance E5a, and resistance E5a is also by resistance F6a, diode H8d ground connection, relay 12 other end connects single-chip microcomputer integrated circuit 11 1 inputs by resistance C3a, electric capacity C3b, diode F6d, single-chip microcomputer integrated circuit 11 comprises timer 111, memory 112, A/D converter 113, comparator 114, memory 112 is for storing the magnitude of voltage of the real-time external AC power changed through A/D converter 113, what store in setting memory 112 is the magnitude of voltage of normal voltage range, comparator 114 is for comparing numerical value in setting memory and real-time voltage memory, timer 111 recovers the cumulative time normally for recording AC power, single-chip microcomputer integrated circuit 11 controls performance element according to the cumulative time of comparative result and timer 111, if when namely in real-time voltage memory, numerical value does not reach numerical value in setting voltage memory, represent that external ac power source is under-voltage, it is that electrical appliance cuts off AC power that single-chip microcomputer integrated circuit 11 controls performance element action, when in real-time voltage memory, numerical value reaches numerical value in setting voltage memory, show that AC power recovers normal, it is that electrical appliance connects AC power that single-chip microcomputer integrated circuit 11 controls performance element action, the overvoltage/undervoltage delay protection module that the utility model adopts, automatically can recover the power supply to electrical appliance when can accomplish that voltage resume is normal after system jam, protection electrical appliance causes damaging from crossing under voltage.

As shown in Figure 3, intelligent electric meter monitoring unit 9 mainly comprises MCU module 90, MCU module 90 connects computation chip 91 respectively, memory module 92, security module 93, infrared communication module 94, RS485 communication module 95, MCU module 90 also connects OFDM chip 97 by UART interface 96, OFDM chip 97 connects main website server 14, wherein, computation chip 91 carries out energy data (voltage, electric current, power, electricity, frequency) collection, memory module 92 is for storage of electrical energy data, main website server 14 is by the long-range reading data of OFDM chip 97, such as, main website server 14 reads the intelligent electric meter data based on OFDM by power carrier channel, wherein, intelligent electric meter resolves the data on power line by OFDM chip, then MCU module 90 is sent to by UART interface 96, then MCU module 90 is by framing after Data Analysis, OFDM chip 97 is sent to by UART interface 96, then be sent on power line, then main website server 14 can be sent to again, main website server 14 can monitor the electric power system real time information that intelligent electric meter collects, can operate each combining inverter, the OFDM chip that it adopts, anti-arrowband jamming performance is strong, can carry out communicating with main website server and transmit a large amount of energy data, can monitor in real time grid-connected system while raising distribution network reliability, ensure that each system normal safe runs .

Above-described embodiment is preferred embodiment of the present utility model; it is not the restriction to technical solutions of the utility model; as long as without the technical scheme that creative work can realize on the basis of above-described embodiment, all should be considered as falling within the scope of the rights protection of the utility model patent.

Claims (2)

1. a distributed power source grid integration system, it is characterized in that: mainly comprise combining inverter, the distributed power source access control unit be connected with described combining inverter, be connected to the low-pressure line-outgoing control unit between described distributed power source access control unit and city's piezoelectric transformer, and the low-pressure reactive compensation control loop to be connected with low-voltage busbar and multichannel low-pressure line-outgoing loop, described distributed power source access control unit connects intelligent electric meter monitoring unit by communication interface, described low-pressure line-outgoing loop connects overvoltage/undervoltage delay protection module, described overvoltage/undervoltage delay protection module mainly comprises rectification stable pressuring unit, performance element and single-chip microcomputer integrated circuit, rectification stable pressuring unit mainly comprises resistance A, electric capacity A the reduction voltage circuit be unified into and diode A, diode B, diode C, the rectification circuit that diode D forms, reduction voltage circuit is also by resistance B, electric capacity D, resistance G connects single-chip microcomputer integrated circuit one end, rectification circuit output end connects performance element respectively by diode E, electric capacity B, performance element comprises relay, triode, transistor collector connects relay, collector electrode also contact resistance D, diode G ground connection successively, grounded emitter, base stage connects single-chip microcomputer integrated circuit one end by resistance E, and resistance E is also by resistance F, diode H ground connection, the relay other end connects single-chip microcomputer integrated circuit input by resistance C, electric capacity C, diode F, single-chip microcomputer integrated circuit comprises timer, memory, A/D converter, comparator.

2. a kind of distributed power source grid integration system according to claim 1, it is characterized in that: described intelligent electric meter monitoring unit mainly comprises MCU module, MCU module connects computation chip, memory module, security module, infrared communication module, RS485 communication module respectively, MCU module also connects OFDM chip by UART interface, and OFDM chip connects main website server.