CN104682414A - Method for converters to switch from grid-connecting to grid-disconnecting - Google Patents
Method for converters to switch from grid-connecting to grid-disconnecting Download PDFInfo
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- CN104682414A CN104682414A CN201310620282.0A CN201310620282A CN104682414A CN 104682414 A CN104682414 A CN 104682414A CN 201310620282 A CN201310620282 A CN 201310620282A CN 104682414 A CN104682414 A CN 104682414A
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Abstract
The invention provides a method for a pluralit of converters to switch from grid-connecting to grid-disconnecting. The method sequentially and mainly comprises the following steps of S10, detecting and judging whether a power grid loses power or not; when the power grid loses the power, performing the step S20; when the power grid does not lose the power, returning back and the continuing to perform the step S10; S20, enabling a controller to control one converter to switch to the grid-disconnecting mode, namely the controller sends a voltage phase correcting instruction to the corresponding converter within the preset period, and the corresponding converter can synchronize the phase of the output voltage within the preset period and the preset reference phase of the controller according to the voltage phase correcting instruction; S30, enabling the controller to disengage a grid-connecting and grid-disconnecting switch; S40, enabling the controller to control the other converters to sequentially enter the grid-disconnecting mode; enabling the controller to control the other converters to sequentially correct the phase of the self output voltage, so as to synchronize the phases of the output voltages of the other converters within the preset period and the preset reference phase of the controller. The method is used for the converters to smoothly switch between the grid-disconnecting and grid-connecting.
Description
Technical field
The present invention relates to a kind of micro-capacitance sensor field, particularly relate to a kind of multiple stage converter and realize off-grid method from grid-connected.
Background technology
Along with the progress of science and technology and the development of society, the demand of modern society to electric power increases day by day.Centralized bulk power grid shows some shortcomings in actual motion, as high in operating cost, be difficult to meet the more and more higher safety and reliability requirement of user, and micro-capacitance sensor can make up the deficiency of bulk power grid very well.Along with China strengthens the stage that intelligent grid enters all-round construction, as the micro-capacitance sensor of the important component part of intelligent grid, also will fill to change in electric equipment, new forms of energy receiving, Intelligent resident electricity utilization etc. and be more widely used at demonstration project, electric automobile.The system that micro-capacitance sensor is made up of jointly power supply, converter, control appliance and load, be one can self-monitoring, operation, protection autonomous system.Micro-capacitance sensor both can be incorporated into the power networks with external electrical network, also can isolated operation (namely from network operation).
So as required, the converter in micro-capacitance sensor can operate in grid-connected and under net pattern respectively.In order to the normal operation of guaranteed load, converter, when carrying out and switch from net, needs to ensure the smooth-going of output voltage.Although the converter of separate unit is less from the grid-connected impact be switched to from being subject to electric current and voltage during net in prior art, micro-capacitance sensor needs multiple energy-storage battery group and the parallel connection of multiple converter with powering load usually.But in prior art, the micro-capacitance sensor including the converter of multiple stage parallel connection switches to from when netting from grid-connected, and the impact being usually subject to electric current and voltage is comparatively large, so that the converter of multiple stage parallel connection is difficult to level and smooth switching to from net pattern from grid-connect mode.
Be understandable that, the statement of this part only provides background information related to the present invention, may form or not form so-called prior art.
Summary of the invention
Technical problem to be solved by this invention is difficult to when being in parallel for prior art multiple stage converter to realize smooth-going switch to off-grid defect from grid-connected, a kind of multiple stage converter is provided to realize off-grid method from grid-connected, to make smooth-going the switching to from net from grid-connected of the converter of multiple stage parallel connection energy, and then reduce the impact that micro-capacitance sensor is subject to voltage and electric current.
The technical solution adopted for the present invention to solve the technical problems is to provide a kind of multiple stage converter and realizes off-grid method from grid-connected, for by the converter of multiple stage parallel connection from and net state switch to from net state, it mainly comprises the following steps successively:
S10, detection and judge electrical network whether dead electricity, if so, then perform step S20, if not, then return and continue to perform step S10;
S20, controller control certain converter and switch to from net pattern: namely controller sends voltage-phase revision directive to described certain converter in predetermined period, and described certain converter makes its phase place of output voltage in predetermined period and the predetermined reference Phase synchronization of controller according to described voltage-phase revision directive;
S30, controller disconnect and from net switch;
S40, controller control remaining converter and enter from net pattern successively: controller controls the phase place that himself output voltage revised successively by remaining converter, with the phase place making the output voltage of remaining converter in predetermined period all with the predetermined reference Phase synchronization of controller.
Realize off-grid method at above-mentioned multiple stage converter from grid-connected, the phase place of himself output voltage of described correction is realized by the frequency of himself output voltage of converter change.
Off-grid method, after step S40, also step S50 is comprised from grid-connected realization: controller calculates the average output power of all converters according to the present output power of every platform converter and described average output power is sent to each converter at above-mentioned multiple stage converter.
Realize off-grid method at above-mentioned multiple stage converter from grid-connected, also comprise after step S50: every platform converter adjusts respective final power output according to the present output power of self and the difference of average output power, to make the final power output of every platform converter consistent with described average output power.
Realize off-grid method at above-mentioned multiple stage converter from grid-connected, the present output power of every platform converter is by every oneself detection computations of platform converter and the present output power of calculating is uploaded to controller.
Realize off-grid method at above-mentioned multiple stage converter from grid-connected, every platform converter oneself regulates the amplitude of its output voltage and frequency to adjust respective final power output.
Realize off-grid method at above-mentioned multiple stage converter from grid-connected, when increasing current collector and current collector collects when electrical network no current exports and judges electrical breakdown between load and electrical network, or when the frequency of output voltage of change certain converter, the frequency of the output voltage of electrical network is corresponding judges electrical breakdown when changing.
Off-grid method, also comprise between above-mentioned steps S20 and step S30 from grid-connected realization at above-mentioned multiple stage converter: described certain converter sends from net handover success mark to controller.
Realize off-grid method at above-mentioned multiple stage converter from grid-connected, in step S40, when predetermined reference Phase synchronization all with controller of the phase place of every platform inverter output voltage, last realizes phase locked converter and sends Phase synchronization Success Flag to controller.
Realize off-grid method at above-mentioned multiple stage converter from grid-connected, be describedly sent to controller from net handover success mark and described Phase synchronization Success Flag by photosignal or message form.
Multiple stage converter provided by the invention realizes off-grid method from grid-connected, it is by first judging electrical network whether dead electricity, then after electrical breakdown controller first control a converter carry out and from net switch, and then controller controls remaining converter and switches one by one in order, namely and then controller control remaining converter successively in predetermined period, the phase place of respective output voltage is adjusted to the predetermined reference Phase synchronization with controller, therefore its can make the converter of multiple stage parallel connection smooth-going switch to from net from grid-connected, and then reduce the impact that micro-capacitance sensor is subject to voltage and electric current.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram that the parallel connection of multiple stage converter forms micro-capacitance sensor;
Fig. 2 is that the converter of the multiple stage parallel connection that one embodiment of the invention provides switches to off-grid flow chart by grid-connected;
Fig. 3 is that the converter of the multiple stage parallel connection that further embodiment of this invention provides switches to off-grid flow chart by grid-connected.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In describing the invention, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
The invention provides and a kind of realize off-grid method for multiple stage converter from grid-connected, the method is mainly used in micro-capacitance sensor, with by the converter of multiple stage parallel connection from and net state switch to from net state.See Fig. 1, it is the structured flowchart of micro-capacitance sensor, and micro-capacitance sensor forms primarily of with lower module: the converter (x=1 ~ N) of x platform parallel connection, an x energy-storage battery group (x=1 ~ N), controller from net switch, load and electrical network.The DC side of converter x is electrically connected with corresponding energy-storage battery group; After multiple stage converter connects with corresponding energy-storage battery, multiple stage converter AC is in parallel, then multiple stage converter is electrically connected with load, and multiple stage converter by and be electrically connected from net switch (in figure and be the switch of three-phase from net switch, with corresponding with three phase network) with electrical network.Wherein, converter, controller, electrical network carry out data interaction by data wire.Operational factor etc. is sent to controller by data wire by each converter, order is sent to each converter by data wire by controller, operation of power networks parameter is also passed to controller by data wire, controller is controlled by data wire and from the break-make of net switch, to control connection and the disconnection of converter and electrical network.
Shown in Fig. 2 and Fig. 3, one provided by the invention is used for multiple stage converter and realizes off-grid method mainly comprise the following steps from grid-connected:
S10, detection and judge electrical network whether dead electricity, if so, then perform step S20, if not, then return and continue to perform step S10; Concrete, when detection determines electrical breakdown, micro-capacitance sensor need to start to perform from and net state switch to from net state, if the non-dead electricity of electrical network, then continue by electrical network powering load, and continue to detect and judge electrical network whether dead electricity.
S20, controller control certain converter and switch to from net pattern: namely controller sends voltage-phase revision directive to described certain converter in predetermined period, and this certain converter makes its phase place of output voltage in predetermined period and the predetermined reference Phase synchronization of controller according to described voltage-phase revision directive; Concrete, controller first controls a certain converter and switches to from net pattern, converter be in and net state time, converter is in constant current output state, and when converter is in from net state, converter is in constant voltage output state.So when certain converter carries out and switches from net, controller switches to by the output current (or power output) controlling described certain converter the output voltage controlling described certain converter.Controller sends instruction to certain converter makes this converter carry out the correction of output voltage in the given time, even if the phase place of the output voltage of certain converter in predetermined period is adjusted to the predetermined reference Phase synchronization with controller.Such as, fixed phase predetermined in controller is 10 degree, and controller controls First converter in 20ms, carries out an output voltage correction, is 10 degree to make the phase place of the output voltage of First converter in 20ms.
S30, controller disconnect and from net switch;
S40, controller control remaining converter and enter from net pattern successively: controller controls the phase place that himself output voltage revised successively by remaining converter, with the phase place making the output voltage of remaining converter in predetermined period all with the predetermined reference Phase synchronization of controller.Concrete, controller goes to control remaining N-1 platform converter successively according to predetermined order and switches to from net module, with the phase place making the output voltage of remaining converter in predetermined period all with the predetermined reference Phase synchronization of controller.After this step completes, the phase place of the output voltage of then all converters is all consistent, and all identical with the predetermined reference phase place of controller, then the output voltage of each converter is no longer by the impact of electrical network, but the phase place of the output voltage of all converters controls to determine by controller.Therefore each converter all achieves and switches to from net from grid-connected, simultaneously, due to controller be control each converter one by one go realize and from net switch, so smooth-going the switching to from net from grid-connected of its entirety that the converter of multiple stage parallel connection can be made to be formed, and then fluctuation of the voltage and current be subject to when entirety can reduce switching.
Above-mentioned and from net handoff procedure, controller becomes control voltage signal from controlling current signal, preferably, under the control of the controller, the frequency that the phase place of each himself output voltage of converter correction mainly changes himself output voltage by converter realizes.Such as, every platform converter oneself regulates its output frequency according to VF algorithm (i.e. the sagging algorithm of electric voltage frequency, VF algorithm is well known to those skilled in the art), to change the phase place that it exports.This mode can make each converter revise the phase place of its output voltage fast and accurately.And controller determines the aim parameter of each converter correction.
Shown in Figure 3, in a preferred embodiment of the invention, also step S50 is comprised: controller calculates the average output power of all converters according to the present output power of every platform converter and described average output power is sent to each converter after step S40, like this can so that controller and each converter understand the operating state of himself and the operating state of remaining converter, and then can so that carry out the coordination of power output between each converter.More preferably, also comprise after step S50: every platform converter adjusts respective final power output according to the present output power of self and the difference of average output power, to make the final power output of every platform converter consistent with described average output power.Namely each converter can realize power output unanimously, exports to realize current-sharing.What deserves to be explained is, the present output power of every platform converter can be drawn by its oneself detection computations, be uploaded to controller again by controller to calculate the average output power of all converters, also can directly remove the present output power of detection computations every platform converter and the average output power of all converters by controller.Preferably, the present output power of every platform converter is by every oneself detection computations of platform converter and the present output power calculated is uploaded to controller, so both can improve and off-grid switching efficiency also can reduce and switch the shock effect to load from net.Preferably simultaneously, every platform converter oneself regulates the amplitude of its output voltage and frequency to realize adjusting respective final power output, namely each converter has self-adjustment function, and the mode adjusting final power output by the amplitude of regulation voltage and frequency also not only can ensure fast and switch from net but also reduce and switch the shock effect to load from net.
What deserves to be explained is, described detection judges whether dead electricity has multiple method to electrical network, but preferably, when increasing current collector and current collector collects electrical network no current exports Time Controller and judge electrical breakdown between load and electrical network, or the corresponding Time Controller that changes of frequency of the output voltage of electrical network judges electrical breakdown when the frequency of output voltage of change certain converter.This mode can detect fast and accurately judges electrical network whether dead electricity, to judge whether fast and accurately to need and to switch from net.
Composition graphs 3 is by provided by the invention and be described below from net changing method again:
S100, controller detect and judge whether electrical network disappears, so that system judges whether to need to be switched to from net by grid-connected, if electrical network disappears, then perform next step, if not, then continue to perform this step.
S200, controller send from net order to First converter, switch to from net pattern to control First converter, and under all the other converters remain running in grid-connect mode; Concrete, controller sends the instruction of primary voltage phase only pupil filter to First converter in 50ms, the phase place of output voltage is adjusted to 0 degree (namely the predetermined reference phase place of controller is 0 degree) by 30 degree in 50ms with order First converter.
S300, after First converter completes above-mentioned phase only pupil filter, namely First converter achieves and switches to from net pattern, and First converter is sent from net handover success mark to controller by photosignal or message form.
S400, controller can to judge that after net handover success mark First converter completes and switches from net receiving, then controller controls and disconnects electrical network from net switch.
S500, controller control remaining converter and enter from net pattern successively: controller controls the phase place (namely controller sends Phase synchronization instruction to each converter successively) that himself output voltage revised successively by remaining converter, with the phase place making the output voltage of remaining converter in predetermined period all with the predetermined reference Phase synchronization of controller.Concrete, controller controls second converter successively, the 3rd converter, N platform converter carry out phase only pupil filter, with the phase place realizing the output voltage of each converter in predetermined period all with the predetermined reference Phase synchronization of controller.Namely also controller controls all the other converters and enters from net pattern successively, and remaining converter carries out frequency conversion according to the synchronizing signal of controller, to revise the phase place of output voltage.Finally, all converters enter from net pattern under control of the controller;
S600, after last converter completes above-mentioned phase only pupil filter, then namely all converters achieve and switch to from net pattern, and last converter sends Phase synchronization Success Flag by photosignal or message form to controller.
S700, every oneself detection computations of platform converter go out respective present output power and the present output power calculated separately are uploaded to controller, and controller calculates the average output power of all converters according to the present output power of every platform converter and described average output power is sent to each converter.
S800, every platform converter adjust respective final power output according to the present output power of self and the difference of average output power, to make the final power output of every platform converter consistent with described average output power.
Visible by above-described embodiment, preferably, also comprise between above-mentioned steps S20 and step S30: certain converter sends from net handover success mark to controller.In step S40, when predetermined reference Phase synchronization all with controller of the phase place of every platform inverter output voltage, last realizes phase locked converter and sends Phase synchronization Success Flag to controller.Controller and whole electrical network can be made like this to realize fast and accurately and switch from net.All send to controller by various ways from net handover success mark and Phase synchronization Success Flag, such as, be sent to controller from net handover success mark and Phase synchronization Success Flag by photosignal or message.
In sum, multiple stage converter provided by the invention realizes off-grid method have the following advantages simultaneously from grid-connected:
1) can realize the converter of multiple stage parallel connection and switch from net;
2) the carrying out that the converter of multiple stage parallel connection is smooth-going can be ensured and switch from net, and being subject to the impact of voltage and current when reducing and switch from net;
3) converter of multiple stage parallel connection can be ensured and realize current-sharing output after net switches.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. multiple stage converter realizes an off-grid method from grid-connected, for by the converter of multiple stage parallel connection from and net state switch to from net state, it is characterized in that, mainly comprise the following steps successively:
S10, detection and judge electrical network whether dead electricity, if so, then perform step S20, if not, then return and continue to perform step S10;
S20, controller control certain converter and switch to from net pattern: controller sends voltage-phase revision directive to described certain converter in predetermined period, and described certain converter makes its phase place of output voltage in predetermined period and the predetermined reference Phase synchronization of controller according to described voltage-phase revision directive;
S30, controller disconnect and from net switch;
S40, controller control remaining converter and enter from net pattern successively: controller controls the phase place that himself output voltage revised successively by remaining converter, with the phase place making the output voltage of remaining converter in predetermined period all with the predetermined reference Phase synchronization of controller.
2. the method for claim 1, is characterized in that, the phase place of himself output voltage of described correction is realized by the frequency of himself output voltage of converter change.
3. the method for claim 1, is characterized in that, after step S40, also comprise step S50:
Controller calculates the average output power of all converters according to the present output power of every platform converter and described average output power is sent to each converter.
4. method as claimed in claim 3, it is characterized in that, also comprise after step S50: every platform converter adjusts respective final power output according to the present output power of self and the difference of average output power, to make the final power output of every platform converter consistent with described average output power.
5. the method as described in claim 3 or 4, is characterized in that, the present output power of every platform converter is by every oneself detection computations of platform converter and the present output power of calculating is uploaded to controller.
6. method as claimed in claim 4, it is characterized in that, every platform converter oneself regulates the amplitude of its output voltage and frequency to adjust respective final power output.
7. the method for claim 1, it is characterized in that, when increasing current collector and current collector collects when electrical network no current exports and judges electrical breakdown between load and electrical network, or when the frequency of output voltage of change certain converter, the frequency of the output voltage of electrical network is corresponding judges electrical breakdown when changing.
8. the method for claim 1, is characterized in that, also comprises between above-mentioned steps S20 and step S30: described certain converter sends from net handover success mark to controller.
9. method as claimed in claim 8, it is characterized in that, in step S40, when predetermined reference Phase synchronization all with controller of the phase place of every platform inverter output voltage, last realizes phase locked converter and sends Phase synchronization Success Flag to controller.
10. method as claimed in claim 9, is characterized in that, is describedly sent to controller from net handover success mark and described Phase synchronization Success Flag by photosignal or message form.
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| CN114006377A (en) * | 2021-11-08 | 2022-02-01 | 北京四方继保自动化股份有限公司 | Method for realizing synchronous control of multiple power electronic devices by adopting PPS (pulse-width modulation) signals |
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| CN114006377A (en) * | 2021-11-08 | 2022-02-01 | 北京四方继保自动化股份有限公司 | Method for realizing synchronous control of multiple power electronic devices by adopting PPS (pulse-width modulation) signals |
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