CN203491711U - Distributed power generation grid-connected control system - Google Patents
Distributed power generation grid-connected control system Download PDFInfo
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- CN203491711U CN203491711U CN201320469031.2U CN201320469031U CN203491711U CN 203491711 U CN203491711 U CN 203491711U CN 201320469031 U CN201320469031 U CN 201320469031U CN 203491711 U CN203491711 U CN 203491711U
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Abstract
The utility model discloses a distributed power generation grid-connected control system and provides a distributed power generation system based on multi-energy and multi-grid-connected inverters, which comprises at least one energy device, a grid-connected coordination circuit, inverters, a load coordination and control circuit, and a first controller. Mainly, the system is coordinated and controlled by means of the grid-connected coordination circuit based on the intercoupling mechanism during the grid-connected operation. During the independent operation, the voltages and the frequencies of multiple energy devices and multiple inverters are coordinated and controlled by means of the grid-connected coordination circuit, so that the reasonable distribution of dynamic loads and steady loads is realized. According to the technical scheme of the utility model, the grid-connected coordination is mainly adopted for the distributed grid-connected power generation. Meanwhile, the power generation is realized by utilizing renewable clean energies. Therefore, the system is high in environmental benefit, good in both safety and reliability, low in cost and high in efficiency, wherein the long-distance power transmission is no longer required. Moreover, the system is beneficial to the reasonable adjustment on the co-ordination of the electricity supply and demand in grid-connected regions.
Description
Technical field
The present invention relates to a kind of power grid-connection control system, be specifically related to a kind of distributed power generation grid-connection control system.
Background technology
Distributed power generation refers to and is directly arranged in power distribution network or is distributed near power generating equipment load, economical, efficiently, generating reliably, distributed power generation help lend some impetus to the energy sustainable development, improve environment and improve the competitiveness of green energy resource.
To be exactly the direct current that produces of solar components convert to after meeting the alternating current that utility grid requires and access public electric wire net through combining inverter grid-connected photovoltaic system, prior art can not effectively coordination be controlled whole electricity generation system and local load etc. the in the situation that of multiple-energy-source, because distributed generation system has many energy sources, the grid-connected feature of multiple-variable flow device (being mainly inverter), therefore must study its grid-connected control, in this regard, comprise: for the distributed generation system with the many combining inverters of multiple-energy-source, study the mechanism and the grid-connected coordination control problem that when it is incorporated into the power networks, intercouples and affect, during research independent operating, the voltage of a plurality of inverters and the coordination of frequency are controlled, with the reasonable distribution realizing dynamically and stable state is loaded, for the distributed generation system with the many combining inverters of multiple-energy-source, study suitable grid-connected, independent control model and harmonious switching control strategy, flexible grid-connected, the transient process of research and the problems such as shock effect of distributed generation system to electrical network or local load.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the invention provides a kind of distributed power generation grid-connection control system, reasonable balance adjustment for electrical network area power supply and demand, be convenient to realize flexible dispatching, realize dynamically and the reasonable distribution of stable state load, flexible grid-connected, transient process and distributed power generation greatly reduce generating to electrical network or local shock effect of loading.
The technical solution adopted in the present invention is: a kind of distributed power generation grid-connection control system, comprises at least one energy source device, for the collection of the energy; Grid-connected coordination circuit, accepts the energy that at least one energy source device gathers, and the direct current that the described energy is produced after grid-connected coordination circuit coordinates is processed is transmitted in following at least one inverter; Inverter, becomes alternating current by described DC inverter, and is transferred to load coordinated control circuit; Load coordinated control circuit, coordinates to control according to the required electric energy of civil power and distributes power, and real time coordination is controlled voltage and the frequency of at least one inverter simultaneously; The first controller, for the loop control of the parameter between described grid-connected coordination circuit, inverter and load coordinated control circuit; Above-mentioned load coordinated control circuit comprises electrical network, static switch, parallel network circuit and load, and connect according to this, described load coordinated control circuit also comprises second controller, described second controller is controlled and is distributed described electrical network output voltage, electric current according to described load, and described load coordinated control circuit is closed-loop control.
Preferably, above-mentioned energy source device comprises solar photovoltaic battery component or wind-driven generator or hydroelectric generator.
Preferably, above-mentioned grid-connected coordination circuit comprises discrete circuitry, boost rectifying circuit, dsp controller, signal deteching circuit and communication system of power grids circuit, described discrete circuitry, boost rectifying circuit, signal deteching circuit and communication system of power grids circuit connect respectively at described dsp controller, and described discrete circuitry comprises the independent commutation circuit of controlling and coordinating to control.
Preferably, above-mentioned dsp controller can also be single-chip microcomputer or PLC controller.
Preferably, above-mentioned second controller comprises load governor, and current described load signal is transferred to following central controller; Central controller, the instruction that feedback is loaded described in switching to load governor, transmit the instruction of above-mentioned circuit breaker break-make and power division instruction, accept output voltage, output current, operating state and the power signal of following micro-source controller feedback simultaneously; Micro-source controller, for controlling the break-make of switching and the circuit breaker of described load, and feeds back output voltage, output current, operating state and power signal to above-mentioned central controller.
Adopt distributed power generation grid-connection control system, the mechanism intercoupling while being mainly incorporated into the power networks by it and grid-connected coordination device are coordinated control circuit, when independent operating, grid-connected coordination device coordinates to control voltage and the frequency of various energy resources device and a plurality of inverters, to realize dynamically and the reasonable distribution of steady state load, distributed power generation of the present invention mainly adopts renewable clear energy sources, environmental benefit is good, security reliability is good, without transmitting electric power at a distance, cost is low, efficiency is high, is conducive to the reasonable adjusting of electrical network area power supply and demand balance.
Accompanying drawing explanation
Fig. 1 is the theory diagram of a kind of distributed power generation grid-connection control system of the present invention;
Fig. 2 is the structural principle block diagram of load coordinated control device in the present invention;
Fig. 3 is the structural principle block diagram of second controller in the present invention.
Embodiment
Below in conjunction with accompanying drawing, describe specific embodiments of the invention in detail.
Embodiment 1
As shown in Figure 1, Figure 2, Figure 3 shows, the present invention includes photovoltaic energy 1, photovoltaic energy 2 ... photovoltaic energy n(is as solar-energy photo-voltaic cell group), wind energy 1, wind energy 2 ... wind energy n equal energy source device, collection for the energy, grid-connected coordination circuit, accept the energy that energy apparatus collects, and send into after the distributed switch coordination in grid-connected coordination circuit, then export by rectification circuit rectification, by booster circuit, boost, by described energy Coordination Treatment and be transmitted in following inverter, inverter is that described DC inverter is become to alternating current, and is transferred to load coordinated control circuit, wherein, load coordinated control circuit is coordinated to control according to the required electric energy of civil power and is distributed power, coordinates to control voltage and the frequency of at least one inverter simultaneously, the first controller, for grid-connected coordination circuit, the loop control of the parameter between energy source inventer and load coordinated control device, grid-connected coordination circuit comprises discrete circuitry, boost rectifying circuit, dsp controller, signal deteching circuit and communication system of power grids circuit, discrete circuitry, boost rectifying circuit, signal deteching circuit and communication system of power grids circuit connect respectively at dsp controller, discrete circuitry comprises again the independent commutation circuit of controlling and coordinating to control, load coordinated control circuit comprises electrical network, static switch, parallel network circuit and load, and connect according to this, load coordinated control circuit also comprises second controller, second controller is controlled a minute power distribution network output voltage according to described load, electric current, load coordinated control circuit is closed-loop control, second controller is controlled the parameters such as minute power distribution network output voltage and electric current according to load, second controller comprises load governor, and current load signal is transferred to central controller, central controller, the instruction that feedback is loaded described in switching to load governor, transmit the instruction of above-mentioned circuit breaker break-make and power division instruction, accept output voltage, output current, operating state and the power signal of following micro-source controller feedback simultaneously, micro-source controller, for controlling the break-make of switching and the circuit breaker of described load, and feeds back output voltage, output current, operating state and power signal to central controller.
When powering load, load control circuit will carry out MPPT maximum power point tracking, with reference to the voltage ratio of voltage and feedback, the result feedback of comparison be returned to the second controller in load coordinated control circuit, adopt closed-loop control, finally according to comparative result, control the reasonable distribution of maximum power.
Embodiment 2, and all the other are identical with described embodiment 1, and difference is, above-mentioned dsp controller can also be single-chip microcomputer or PLC controller.
Introduce operation principle of the present invention below.
Multiple-energy-source device will exported by rectification circuit rectification after the distributed switch management of sending into after various energy resource collectings in grid-connected coordination circuit, rectification after first boosting by boost rectifying circuit, then connect inverter, inverter is by converting direct-current power into alternating-current power, then access grid-connected circuit in parallel, the alternating current being reverse into is synchronizeed with the electrical quantity of the city's net being incorporated to, make consistent with the electrical quantity of city's net, and be transferred to load coordinated control circuit, the applicable power of electric energy coordinated allocation that load coordinated control circuit is required according to civil power, coordinate to control voltage and the frequency of at least one inverter simultaneously, the first controller loop control grid-connected coordination device, parameter between inverter and load coordinated control device, and give and feedback, wherein, comprise electrical network, static switch, parallel network circuit and load, and connect according to this, load coordinated control circuit also comprises second controller, second controller is controlled a minute power distribution network output voltage according to load, electric current, load coordinated control circuit is closed-loop control, the output signal of utility grid is controlled to break-make by static switch, and connecting breaker has played the effect of connecting and disconnecting of the circuit and protection, and grid-connected with electric organ, whole load coordinated control device can move by controller controling circuit by second, second controller is transferred to following central controller by current described payload signal, central controller, the instruction of loading described in feedback switching is to load governor, transmit the instruction of above-mentioned circuit breaker break-make and power division instruction, accept the output voltage of following micro-source controller feedback simultaneously, output current, operating state and power signal, micro-source controller is controlled the break-make of switching and the circuit breaker of described load, and feed back output voltage, output current, operating state and power signal are given above-mentioned central controller.
Adopt the beneficial effect of the technical program to be: to adopt distributed power generation grid-connection control system, the mechanism intercoupling while being mainly incorporated into the power networks by it and grid-connected coordination device are coordinated control circuit, when independent operating, grid-connected coordination device coordinates to control voltage and the frequency of various energy resources device and a plurality of inverters, to realize dynamically and the reasonable distribution of steady state load, distributed power generation of the present invention mainly adopts renewable clear energy sources, environmental benefit is good, security reliability is good, without transmitting electric power at a distance, cost is low, efficiency is high, be conducive to the reasonable adjusting of electrical network area power supply and demand balance.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, and these all belong to protection scope of the present invention.
Claims (5)
1. a distributed power generation grid-connection control system, is characterized in that, comprises at least one energy source device, for the collection of the energy; Grid-connected coordination circuit, accepts the energy that at least one energy source device gathers, and the direct current that the described energy is produced after grid-connected coordination circuit coordinates is processed is transmitted in following at least one inverter; Inverter, becomes alternating current by described DC inverter, and is transferred to load coordinated control circuit; Load coordinated control circuit, controls and distributes according to the required electric energy real time coordination of civil power, coordinates to control voltage and the frequency of at least one inverter simultaneously; The first controller, for the loop control of the parameter between described grid-connected coordination circuit, inverter and load coordinated control circuit; Described load coordinated control circuit comprises electrical network, static switch, parallel network circuit and load, and connect according to this, described load coordinated control circuit also comprises second controller, described second controller is controlled and is distributed described electrical network output voltage, electric current according to described load, and described load coordinated control circuit is closed-loop control.
2. distributed power generation grid-connection control system according to claim 1, is characterized in that, described energy source device comprises solar photovoltaic battery component or wind-driven generator or hydroelectric generator.
3. distributed power generation grid-connection control system according to claim 1, it is characterized in that, described grid-connected coordination circuit comprises discrete circuitry, boost rectifying circuit, dsp controller, signal deteching circuit and communication system of power grids circuit, described discrete circuitry, boost rectifying circuit, signal deteching circuit and communication system of power grids circuit connect respectively at described dsp controller, and described discrete circuitry comprises the independent commutation circuit of controlling and coordinating to control.
4. distributed power generation grid-connection control system according to claim 1, is characterized in that, described dsp controller can also be single-chip microcomputer or PLC controller.
5. distributed power generation grid-connection control system according to claim 1, is characterized in that, described second controller comprises load governor, and current described load signal is transferred to following central controller; Central controller, the instruction that feedback is loaded described in switching to load governor, transmit the instruction of above-mentioned circuit breaker break-make and power division instruction, accept output voltage, output current, operating state and the power signal of following micro-source controller feedback simultaneously; Micro-source controller, for controlling the break-make of switching and the circuit breaker of described load, and feeds back output voltage, output current, operating state and power signal to above-mentioned central controller.
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| CN201320469031.2U CN203491711U (en) | 2013-08-02 | 2013-08-02 | Distributed power generation grid-connected control system |
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| CN201320469031.2U CN203491711U (en) | 2013-08-02 | 2013-08-02 | Distributed power generation grid-connected control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267777A (en) * | 2014-07-30 | 2015-01-07 | 上海交通大学 | Allocation type solar power grid-connected power generation control method based on wireless network |
| CN104348182A (en) * | 2013-08-02 | 2015-02-11 | 江苏瑞新科技股份有限公司 | Distributed power generation grid-connected control system |
-
2013
- 2013-08-02 CN CN201320469031.2U patent/CN203491711U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348182A (en) * | 2013-08-02 | 2015-02-11 | 江苏瑞新科技股份有限公司 | Distributed power generation grid-connected control system |
| CN104267777A (en) * | 2014-07-30 | 2015-01-07 | 上海交通大学 | Allocation type solar power grid-connected power generation control method based on wireless network |
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