CN203883488U - Grid-connected power conditioning system having dynamic reactive power compensation function - Google Patents
Grid-connected power conditioning system having dynamic reactive power compensation function Download PDFInfo
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- CN203883488U CN203883488U CN201420053736.0U CN201420053736U CN203883488U CN 203883488 U CN203883488 U CN 203883488U CN 201420053736 U CN201420053736 U CN 201420053736U CN 203883488 U CN203883488 U CN 203883488U
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- Y02E40/30—Reactive power compensation
Abstract
The application discloses a grid-connected power conditioning system having a dynamic reactive power compensation function. A total reactive power compensation current signal is calculated and obtained via a centralized controller based on a three-phase current signal and a three-phase voltage signal, and is transmitted to a grid-connected inverter successively via an optic-electric and electro-optic conversion device and an optical fiber, and thus the grid-connected inverter calculates and obtains the magnitude of a stand-alone reactive power compensation current required to be transmitted to a power grid. In this way, the stand-alone reactive power compensation current transmitted by the grid-connected inverter in the system varies with the current status of the power grid; and the total reactive power compensation current signal outputted by the centralized controller is transmitted to the grid-connected inverter via the optical fiber, the signal transmission speed is greatly increased, rapid dynamic reactive power compensation for the power grid is achieved, and two factors of system cost and reactive power compensation speed can be balanced without requiring dedicated reactive power compensation equipment.
Description
Technical field
The application relates to grid-connected control technology field, relates in particular to a kind of grid-connected power regulating system with dynamic no-power compensation function.
Background technology
Grid-connected power regulating system is converted to electrical network and is fed to electrical network with the AC energy of frequency homophase for the electric energy that generating equipment is produced, and ensures higher grid-connected power factor; General, in the electric current that system sends to electrical network, only comprise active current.But in some special occasions, as strong not in partial electric grid, or electrical network need to unify to carry out Reactive Power Dispatch, or concentrated photovoltaic power station power generation process causes voltage ripple of power network, or the active power that electrical network provides to user in distributed generation system reduce, reactive power constant and cause power factor decline do not meet electric company power factor require time, the power regulating system of single transmission active current is difficult to satisfy the demands.
Prior art adopts special reactive-load compensation equipment, or has the combining inverter of no-power compensation function, electrical network is carried out to reactive power compensation, to maintain the stabilization of power grids.But the former has increased additional investment, the latter can only send the reactive current of fixed capacity, cannot adapt to reactive requirement and change fast occasion; Be that prior art is difficult to take into account system cost and reactive power compensation speed.
Utility model content
In view of this, the application's object is to provide a kind of grid-connected power regulating system with dynamic no-power compensation function, to solve the problem that is difficult to take into account system cost and reactive power compensation speed when prior art is carried out reactive power compensation.
For achieving the above object, the application provides following technical scheme:
A grid-connected power regulating system with dynamic no-power compensation function, comprising: Centralized Controller, the combining inverter with no-power compensation function, electric light and photoelectric conversion device and optical fiber;
Described Centralized Controller comprises:
Sampling obtains the three-phase current signal of digital signal form and the sampling of three-phase voltage signal and modulate circuit;
Be connected with described sampling modulate circuit, calculate the data processing chip of total reactive power compensation current signal according to described three-phase current signal and three-phase voltage signal;
Described electric light and photoelectric conversion device at least comprise: described the first electric light change-over panel being connected with described data processing chip and the described photoelectric conversion plate being connected with described combining inverter, and described the first photoelectric conversion plate is connected by described optical fiber with described photoelectric conversion plate, so that described total reactive power compensation current signal is sent to described combining inverter by optical fiber.
Preferably, described data processing chip is provided with serial peripheral equipment interface SPI, to export described total reactive power compensation current signal.
Preferably, described grid-connected power regulating system also comprises:
Be connected with described SPI, described total reactive power compensation current signal be converted to the first change-over circuit of corresponding differential signal output by single-ended signal;
And, be connected with described the first change-over circuit, total reactive power compensation electric current of described differential signal form is reverted to described single-ended signal and export the second change-over circuit of described the first electric light change-over panel to.
Preferably, described data processing chip is also provided with serial communication interface SCI;
Described SCI is connected with described combining inverter by data/address bus, to obtain the work state information of described combining inverter;
Described data processing chip also calculates the current capacity of described combining inverter according to the described work state information getting, and exports described combining inverter to by described SPI.
Preferably, described combining inverter has multiple, and described combining inverter is corresponding one by one with described photoelectric conversion plate.
Preferably, described electric light and photoelectric conversion device also comprise multiple the second electric light change-over panels, and described the second electric light change-over panel is corresponding one by one with described photoelectric conversion plate;
Between multiple described combining inverters, carry out cascade connection by described photoelectric conversion plate and the second electric light change-over panel with daisy chain form; Described the first electric light change-over panel only photoelectric conversion plate corresponding to first order combining inverter connects.
Can find out from above-mentioned technical scheme, the application calculates total reactive power compensation current signal by Centralized Controller according to the three-phase current signal of electrical network and three-phase voltage signal, successively by the first electric light change-over panel, optical fiber and photoelectric conversion plate, this total reactive power compensation current signal is issued to combining inverter, and then combining inverter calculates the size of the unit reactive power compensation electric current that self need to send to electrical network according to this total reactive power compensation current signal; In the present embodiment, the size of the unit reactive power compensation electric current that combining inverter sends to electrical network no longer immobilizes, but calculated by three-phase current signal and the three-phase voltage signal of current electrical network, the unit reactive power compensation electric current that combining inverter sends to electrical network changes with the change of the current state of electrical network; And total reactive power compensation current signal (being communication instruction) of Centralized Controller output is transmitted through the fiber to combining inverter, has greatly improved signaling rate; Therefore the embodiment of the present application has realized the quick dynamic passive compensation to electrical network; Simultaneously, the embodiment of the present application does not need special reactive-load compensation equipment, only can reach the object of quick dynamic passive compensation by lower-cost Centralized Controller, optical fiber and photoelectricity/electric light change-over panel, take into account two factors of system cost and reactive power compensation speed, solved the problem of prior art.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structure chart of the grid-connected power regulating system that Fig. 1 provides for the embodiment of the present application one;
The structure chart of the grid-connected power regulating system that Fig. 2 provides for the embodiment of the present application two;
The structure chart of the grid-connected power regulating system that Fig. 3 provides for the embodiment of the present application three;
The structure chart of the grid-connected power regulating system that Fig. 4 provides for the embodiment of the present application four;
Fig. 5 is the combining inverter dicyclo control principle schematic diagram in the embodiment of the present application;
Fig. 6 is the schematic diagram that in the embodiment of the present application, SPI signal is converted to differential signal.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiment.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
The embodiment of the present application discloses a kind of grid-connected power regulating system with dynamic no-power compensation function, to solve the problem that is difficult to take into account system cost and reactive power compensation speed when prior art is carried out reactive power compensation.
With reference to Fig. 1, a kind of grid-connected power regulating system with dynamic no-power compensation function that the embodiment of the present application provides, comprising: Centralized Controller 1, combining inverter 2, electric light and the photoelectric conversion device with no-power compensation function and optical fiber 5.Wherein, described electric light and photoelectric conversion device at least comprise: photoelectric conversion plate 3 and the first electric light change-over panel 41; Centralized Controller 1 comprises: sampling modulate circuit 11 and data processing chip 12, and data processing chip 12 is connected with sampling modulate circuit 11 and the first electric light change-over panel 41 respectively.Combining inverter 2 is connected with photoelectric conversion plate 3, is connected, the output signal of data processing chip 12 is fed to described combining inverter 2 between photoelectric conversion plate 3 and the first electric light change-over panel 41 by optical fiber 5.
The course of work that above-mentioned grid-connected power regulating system carries out reactive power compensation is as follows: 11 samplings of sampling modulate circuit obtain the three-phase current signal (i of digital signal form
a, i
band i
c) and three-phase voltage signal (u
a, u
band u
c); Data processing chip 12 is according to described three-phase current signal (i
a, i
band i
c) and three-phase voltage signal (u
a, u
band u
c) calculate total reactive power compensation current signal; Above-mentioned total reactive power compensation current signal is converted to corresponding light signal by the first electric light change-over panel 41, and through optical fiber 5 remote transmission, to photoelectric conversion plate 3, photoelectric conversion plate 3 reverses this light signal to be changed to total reactive power compensation current signal again, offers combining inverter 2; Combining inverter 2 utilizes its no-power compensation function, calculates the size of the unit reactive power compensation electric current that self need to send to electrical network, thereby completed reactive power compensation process according to described total reactive power compensation current signal and self default reactive power compensation allocation proportion.
From said structure and the course of work, the embodiment of the present application calculates total reactive power compensation current signal by Centralized Controller according to the three-phase current signal of electrical network and three-phase voltage signal, successively by the first electric light change-over panel, optical fiber and photoelectric conversion plate, this total reactive power compensation current signal is issued to combining inverter, and then combining inverter calculates the size of the unit reactive power compensation electric current that self need to send to electrical network according to this total reactive power compensation current signal; In the present embodiment, the size of the unit reactive power compensation electric current that combining inverter sends to electrical network no longer immobilizes, but calculated by three-phase current signal and the three-phase voltage signal of current electrical network, the unit reactive power compensation electric current that combining inverter sends to electrical network changes with the change of the current state of electrical network; And total reactive power compensation current signal (being communication instruction) of Centralized Controller output is transmitted through the fiber to combining inverter, has greatly improved signaling rate; Therefore the embodiment of the present application has realized the quick dynamic passive compensation to electrical network; Simultaneously, the embodiment of the present application does not need special reactive-load compensation equipment, only can reach the object of quick dynamic passive compensation by lower-cost Centralized Controller, optical fiber and photoelectricity/electric light change-over panel, take into account two factors of system cost and reactive power compensation speed, solved the problem of prior art.
Preferably, the embodiment of the present application two provides the another kind of grid-connected power regulating system with dynamic no-power compensation function; As shown in Figure 2, it comprises: Centralized Controller 1, combining inverter 2, electric light and the photoelectric conversion device with no-power compensation function, optical fiber 5, the first change-over circuit 61 and the second change-over circuit 62.Wherein, described electric light and photoelectric conversion device at least comprise: photoelectric conversion plate 3 and the first electric light change-over panel 41; Centralized Controller comprises: sampling modulate circuit 11 and data processing chip 12; Data processing chip 12 is provided with Serial Peripheral Interface (SPI) (SPI) 121.
Based on SPI communication protocol, the signal that data processing chip 12 generates is exported by Serial Peripheral Interface (SPI) 121, and then be converted to after differential signal by the first change-over circuit 61, transfer to the second change-over circuit 62, above-mentioned differential signal is reduced to single-ended signal by the second change-over circuit 62, transferring to the first electric light change-over panel 41.
Between the first electric light change-over panel 41 and photoelectric conversion plate 3, be connected by optical fiber 5, photoelectric conversion plate 3 is connected with combining inverter 2; The signal of telecommunication receiving is converted to light signal by the first electric light change-over panel 41, and pass through optical fiber 5 remote transmission to combining inverter side; In combining inverter side, first by photoelectric conversion plate 3, the light signal receiving is reduced to the signal of telecommunication, then is fed to combining inverter 2.
The course of work that above-mentioned grid-connected power regulating system carries out reactive power compensation is as follows: 11 samplings of sampling modulate circuit obtain the three-phase current signal (i of digital signal form
a, i
band i
c) and three-phase voltage signal (u
a, u
band u
c), data processing chip 12 is according to described three-phase current signal (i
a, i
band i
c) and three-phase voltage signal (u
a, u
band u
c) calculate total reactive power compensation current signal, and export in the mode of synchronous serial communication by Serial Peripheral Interface (SPI) 121, the signal that Serial Peripheral Interface (SPI) 121 is exported is single-ended signal, after being converted into differential signal by the first change-over circuit 61, export, improve the antijamming capability of signal, at signal receiver side (i.e. the first electric light change-over panel 41) configuration the second change-over circuit 62, first total reactive power compensation electric current of the differential signal form receiving is reduced to single-ended signal form, be light signal by the first electric light change-over panel 41 by total reactive power compensation current conversion of the signal of telecommunication (single-ended signal) form again, with by fiber-optics remote transmission to combining inverter side, the light signal receiving is reduced to the signal of telecommunication by the photoelectric conversion plate 3 of combining inverter side, and be fed to combining inverter 2, and then combining inverter 2 utilizes its no-power compensation function, calculate the size of the unit reactive power compensation electric current that self need to send to electrical network according to described total reactive power compensation current signal and self default reactive power compensation allocation proportion, thereby completed reactive power compensation process.
From said structure and the course of work, the embodiment of the present application calculates total reactive power compensation current signal by Centralized Controller according to the three-phase current signal of electrical network and three-phase voltage signal, successively by the first electric light change-over panel, optical fiber and photoelectric conversion plate, this total reactive power compensation current signal is issued to combining inverter, and then combining inverter calculates the size of the unit reactive power compensation electric current that self need to send to electrical network according to this total reactive power compensation current signal; Be in the embodiment of the present application, the unit reactive power compensation electric current that combining inverter sends to electrical network changes with the change of the current state of electrical network; And total reactive power compensation current signal of Centralized Controller output is transmitted through the fiber to combining inverter, greatly improve signaling rate, realize the quick dynamic passive compensation to electrical network, and do not needed special reactive-load compensation equipment to take into account system cost and two factors of reactive power compensation speed.Meanwhile, the embodiment of the present application is also applied SPI communication protocol, and total reactive power compensation current signal that data processing chip generates is exported by SPI interface, simply efficient; Simultaneously, by the first change-over circuit and the second change-over circuit, realize the form transmission with differential signal between data processing chip and the first electric light change-over panel of total reactive power compensation current signal, improved the antijamming capability of signal, thereby ensured the accuracy of reactive power compensation.
Optionally, above-mentioned the first change-over circuit and the second change-over circuit are all selected the signaling conversion circuit with bi-directional conversion function,, according to corresponding control command, single-ended signal can be converted to differential signal, differential signal can be converted to single-ended signal again.Fig. 6 is the conversion schematic diagram between SPI signal (single-ended signal) and differential signal under SPI communication master slave mode in the embodiment of the present application.
For further ensureing the accuracy of reactive power compensation, the embodiment of the present application three provides the another kind of grid-connected power regulating system with dynamic no-power compensation function; As shown in Figure 3, it comprises: Centralized Controller 1, combining inverter 2, electric light and the photoelectric conversion device with no-power compensation function, optical fiber 5, the first change-over circuit 61 and the second change-over circuit 62.Wherein, described electric light and photoelectric conversion device at least comprise: photoelectric conversion plate 3 and the first electric light change-over panel 41; Centralized Controller comprises: sampling modulate circuit 11 and data processing chip 12; Data processing chip 12 is provided with Serial Peripheral Interface (SPI) (SPI) 121 and serial communication interface (SCI) 122.
Based on SCI communication protocol, data processing chip 12 obtains the work state information of combining inverter 2 by serial communication interface 122 from data/address bus (as RS485 bus).
Based on SPI communication protocol, the signal that data processing chip 12 generates is exported by Serial Peripheral Interface (SPI) 121, and then be converted to after differential signal by the first change-over circuit 61, transfer to the second change-over circuit 62, above-mentioned differential signal is reduced to single-ended signal by the second change-over circuit 62, transferring to the first electric light change-over panel 41.Wherein, the signal that data processing chip 12 generates comprises: according to the three-phase current signal (i of electrical network
a, i
band i
c) and three-phase voltage signal (u
a, u
band u
c) total reactive power compensation current signal of calculating, and the current capacity of the combining inverter 2 calculating according to described work state information.
Between the first electric light change-over panel 41 and photoelectric conversion plate 3, be connected by optical fiber 5, photoelectric conversion plate 3 is connected with combining inverter 2; The signal of telecommunication receiving is converted to light signal by the first electric light change-over panel 41, and pass through optical fiber 5 remote transmission to combining inverter side; In combining inverter side, first by photoelectric conversion plate 3, the light signal receiving is reduced to the signal of telecommunication, then is fed to combining inverter 2.
In above-mentioned grid-connected power regulating system, the work state information of self is sent to data/address bus by combining inverter 2; Based on SCI communication protocol, data processing chip 12 obtains the work state information on data/address bus by serial communication interface 122; Data processing chip 12 is on the one hand according to the three-phase current signal (i of electrical network
a, i
band i
c) and three-phase voltage signal (u
a, u
band u
c) calculate total reactive power compensation current signal, calculate on the other hand the current capacity of combining inverter 2 according to described work state information; The current capacity of described total reactive power compensation current signal and combining inverter 2 is after Serial Peripheral Interface (SPI) 121 outputs, being converted to differential signal through the first change-over circuit 61 transmits, to receiver side, first through the second change-over circuit 62, this differential signal is reduced to single-ended signal, be converted to the signal of telecommunication by the first electric light change-over panel 41 again, carry out long-distance transmissions by optical fiber; To photoelectric conversion plate 3, be reduced to the signal of telecommunication and be sent to combining inverter 2; Combining inverter 2 obtains the size of the unit reactive power compensation electric current that self need to send to electrical network according to described current capacity and described total reactive power compensation calculated signals, thereby has completed reactive power compensation process.
From said structure and the course of work, the unit reactive power compensation electric current that in the embodiment of the present application, combining inverter sends to electrical network changes with the change of the current state of electrical network; And total reactive power compensation current signal of Centralized Controller output is transmitted through the fiber to combining inverter, greatly improve signaling rate, realize the quick dynamic passive compensation to electrical network, and do not needed special reactive-load compensation equipment to take into account system cost and two factors of reactive power compensation speed.Simultaneously, Centralized Controller utilizes two kinds of communication modes to realize dynamic passive compensation, that is: obtain the work state information of combining inverter by slower SCI communication, determined the current capacity of combining inverter according to this work state information by the data processing chip in Centralized Controller, the three-phase current signal simultaneously getting according to sampling modulate circuit calculates total reactive power compensation current signal; And then by SPI communication faster, described current capacity and total reactive power compensation current signal are fed to combining inverter fast; Combining inverter utilizes the no-power compensation function of self, calculates the unit reactive power compensation electric current matching with self work at present state and electrical network present situation; Therefore, the embodiment of the present application, by above-mentioned fast slow two kinds of communication modes, has not only realized quick, the high-precision dynamic passive compensation to electrical network, has also solved the contradiction between combining inverter centralized dispatching communication and fast dynamic response.
Concrete, combining inverter carries out power division and scheduling according to described current capacity and described total reactive power compensation signal, and the method for exporting corresponding reactive power compensation electric current is as follows:
(1) scheduling mode is chosen
A) automated manner
Receive electric network reactive-load dispatch command, directly distribute; Or the communication instruction sending according to Centralized Controller calculates unit reactive power compensation current-order.
B) manual mode
Offset current size is manually set.
(2) power division
A) pro-rata, response is fast, is equivalent to the primary distribution of unit combining inverter power concentration; Distribute formula as follows:
Wherein, the current capacity of this unit is the current capacity that data processing chip calculates according to the work state information of this combining inverter, and total capacity in parallel is the current capacity sum of all combining inverters in described grid-connected power regulating system; Each capacity in above-mentioned formula all can be converted as corresponding reactive power compensation electric current, and total reactive power compensation electric current that total idle command capacity calculates with data processing chip is corresponding, and command capacity that unit is idle is corresponding with unit reactive power compensation electric current; Therefore can calculate every combining inverter by above formula need to be to the size of the reactive power compensation electric current of electrical network transmission.
May there is capacity volume variance in pro-rata time, unreasonable distribution, utilize insufficient, the problem such as harmonic wave is large.
B) Optimized Operation, by Centralized Controller, subordinate's combining inverter in parallel is optimized to configuration, allocation plan is considered according to combined factors such as the capacity of each combining inverter, state, work durations, it is little that this scheme is applicable to idle variation, violent occasion, this scheme furthermore make full use of each combining inverter capacity in parallel, reduce the situation that harmonic wave is sent out in inverter light load operation a large amount of, improve the quality of power supply, can allow inverter rationally use and increase the service life simultaneously.
C) comprehensive A, B two schemes, manually chooses or Centralized Controller intelligence is chosen power dispatching.Centralized Controller is according to historical information, optimization process Rational choice scheduling scheme, and in the situation that total reactive requirement is little, Optimized Operation, when demand is large, pro rate by measure, relevant control strategy need be formulated in conjunction with actual demand.
For the grid-connected system that has multiple combining inverters, for minimizing cost, the embodiment of the present application four provides again a kind of grid-connected power regulating system with dynamic no-power compensation function; As shown in Figure 4, it comprises: Centralized Controller 1, multiple combining inverter 2(with no-power compensation function are the combining inverter shown in Fig. 4 (1), combining inverter (2) ... combining inverter (n)), electric light and photoelectric conversion device, optical fiber 5, the first change-over circuit 61 and the second change-over circuit 62.Wherein, described electric light and photoelectric conversion device at least comprise: photoelectric conversion plate 3, the first electric light change-over panel 41 and the second electric light change-over panel 42; Centralized Controller comprises: sampling modulate circuit 11 and data processing chip 12; Data processing chip 12 is provided with Serial Peripheral Interface (SPI) (SPI) 121 and serial communication interface (SCI) 122.
Based on SCI communication protocol, data processing chip 12 obtains the work state information of combining inverter 2 by serial communication interface 122 from data/address bus (as RS485 bus).
Based on SPI communication protocol, the signal that data processing chip 12 generates is exported by Serial Peripheral Interface (SPI) 121, and then be converted to after differential signal by the first change-over circuit 61, transfer to the second change-over circuit 62, above-mentioned differential signal is reduced to single-ended signal by the second change-over circuit 62, transferring to the first electric light change-over panel 41.
Each combining inverter 2 disposes a photoelectric conversion plate 3 and a second electric light change-over panel 42, between multiple combining inverters, adopt daisy chain connected mode to carry out cascade connection, that is: the first electric light change-over panel 41 connects by the optical fiber photoelectric conversion plate 3 corresponding with first order combining inverter, the input of the second electric light change-over panel 42 that every grade of combining inverter is corresponding is electrically connected with its photoelectric conversion plate 3, and output is connected by optical fiber with the photoelectric conversion plate 3 of next stage combining inverter; The communication instruction of the electrical signal form that the photoelectric conversion plate 3 of every grade of combining inverter is converted to, be sent on the one hand this grade of combining inverter, be sent on the other hand the second electric light change-over panel 42 of this grade of combining inverter, so that being converted to light signal again, communication instruction is sent to next stage combining inverter, the photoelectric conversion plate 3 that is combining inverter configurations at different levels is equivalent to optical fiber Receiver, and the second electric light change-over panel 42 is equivalent to optical fiber delivery header; The communication instruction that Centralized Controller generates transfers to each combining inverter step by step.
In addition, waterfall sequence is according to the distance decision between each combining inverter, and object is to make the spacing sum minimum of adjacent two-stage grid-connected inverter, i.e. fiber lengths minimum used.
From said structure, be connected with each combining inverter by optical fiber respectively with respect to Centralized Controller, the embodiment of the present application adopts daisy chain connected mode that each combining inverter is carried out to cascade connection by optical fiber, has greatly reduced the use amount of optical fiber, has reduced system cost; Meanwhile, the high-speed transfer characteristic of optical fiber has ensured the speed that communication instruction transmits step by step, although the communication instruction that therefore Centralized Controller generates transfers to each combining inverter step by step, can not reduce each combining inverter reactive power compensation speed.
In addition, in the embodiment of the present application, the input signal of sampling modulate circuit is the three-phase voltage signal of the three-phase current signal of the analog signal form that gets by current sensor and the analog signal form that gets by voltage sensor, sampling modulate circuit built-in signal conditioning module and analog-to-digital conversion module, be converted to described three-phase current signal and three-phase voltage signal number range and meet the digital signal of data processing chip requirement.
In the embodiment of the present application, data processing chip calculates total reactive power compensation electric current according to instantaneous reactive power theory; Concrete, by three-phase current signal i
a, i
band i
ccarry out clark coordinate transform, obtain the power network current signal i under two-phase rest frame
αand i
β(following formula one), and then by i
αand i
βcarry out park changes in coordinates, obtain the power network current signal i under two-phase rotating coordinate system
pand i
q(following formula two), and by low pass filter filtering (filtering harmonic wave), filtered i
pbe instantaneous meritorious fundamental current, filtered i
qbe instantaneous reactive fundamental current; By the i before and after filtering
qsubtract each other, obtain reactive power harmonic current; According to the actual requirements, reactive power compensation comprises fundamental wave reactive power compensation (a compensating reactive power fundamental current) and full compensation (both compensating reactive power fundamental currents, again compensating reactive power harmonic current).Three-phase voltage signal is for determining electrical network phase place.
Wherein, clark coordinate transform formula is:
Park coordinate transform formula is:
In the embodiment of the present application, combining inverter, in carrying out reactive power compensation in conjunction with Centralized Controller, also carries out active power regulation to electrical network; Concrete, adopt the dicyclo control mode of ring and direct voltage outer shroud in traditional inductive current, based on voltage feed-forward control decoupling control policy, adopt pi regulator to generate the compensating signal of gaining merit, control principle block diagram is as shown in Figure 5.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the application.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the case of not departing from the application's spirit or scope, realize in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a grid-connected power regulating system with dynamic no-power compensation function, is characterized in that, comprising: Centralized Controller, the combining inverter with no-power compensation function, electric light and photoelectric conversion device and optical fiber;
Described Centralized Controller comprises:
Sampling obtains the three-phase current signal of digital signal form and the sampling modulate circuit of three-phase voltage signal;
Be connected with described sampling modulate circuit, calculate the data processing chip of total reactive power compensation current signal according to described three-phase current signal and three-phase voltage signal;
Described electric light and photoelectric conversion device at least comprise: the first electric light change-over panel being connected with described data processing chip and the photoelectric conversion plate being connected with described combining inverter, and described the first electric light change-over panel is connected by described optical fiber with described photoelectric conversion plate, so that described total reactive power compensation current signal is sent to described combining inverter by optical fiber.
2. grid-connected power regulating system according to claim 1, is characterized in that, described data processing chip is provided with serial peripheral equipment interface SPI, to export described total reactive power compensation current signal.
3. grid-connected power regulating system according to claim 2, is characterized in that, also comprises:
Be connected with described SPI, described total reactive power compensation current signal be converted to the first change-over circuit of corresponding differential signal output by single-ended signal;
And, be connected with described the first change-over circuit, total reactive power compensation electric current of described differential signal form is reverted to described single-ended signal and export the second change-over circuit of described the first electric light change-over panel to.
4. grid-connected power regulating system according to claim 2, is characterized in that, described data processing chip is also provided with serial communication interface SCI;
Described SCI is connected with described combining inverter by data/address bus, to obtain the work state information of described combining inverter;
Described data processing chip also calculates the current capacity of described combining inverter according to the described work state information getting, and exports described combining inverter to by described SPI.
5. according to the grid-connected power regulating system described in claim 1～4 any one, it is characterized in that, described combining inverter has multiple, and described combining inverter is corresponding one by one with described photoelectric conversion plate.
6. grid-connected power regulating system according to claim 5, is characterized in that, described electric light and photoelectric conversion device also comprise multiple the second electric light change-over panels, and described the second electric light change-over panel is corresponding one by one with described photoelectric conversion plate;
Between multiple described combining inverters, carry out cascade connection by described photoelectric conversion plate and the second electric light change-over panel with daisy chain form; Described the first electric light change-over panel only photoelectric conversion plate corresponding to first order combining inverter connects.
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| CN201420053736.0U CN203883488U (en) | 2014-01-27 | 2014-01-27 | Grid-connected power conditioning system having dynamic reactive power compensation function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917181A (en) * | 2015-06-30 | 2015-09-16 | 华为技术有限公司 | Reactive and harmonic wave compensation method, device and system |
| CN113887003A (en) * | 2021-09-26 | 2022-01-04 | 南方电网能源发展研究院有限责任公司 | Method, device, equipment and storage medium for determining strong local power grid structure |
-
2014
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917181A (en) * | 2015-06-30 | 2015-09-16 | 华为技术有限公司 | Reactive and harmonic wave compensation method, device and system |
| CN104917181B (en) * | 2015-06-30 | 2018-06-26 | 华为技术有限公司 | Idle and harmonic compensation method, device and system |
| CN113887003A (en) * | 2021-09-26 | 2022-01-04 | 南方电网能源发展研究院有限责任公司 | Method, device, equipment and storage medium for determining strong local power grid structure |
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