CN203690945U - AC-DC exchange control circuit and micro power grid - Google Patents
AC-DC exchange control circuit and micro power grid Download PDFInfo
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- CN203690945U CN203690945U CN201420011234.1U CN201420011234U CN203690945U CN 203690945 U CN203690945 U CN 203690945U CN 201420011234 U CN201420011234 U CN 201420011234U CN 203690945 U CN203690945 U CN 203690945U
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Abstract
The utility model relates to the power grid electricity supply field, particularly to an AC-DC exchange control circuit and micro power grid. The AC-DC exchange control circuit provided by the utility model comprises an AC-DC exchange converter and a bus capacitor. The AC-DC exchange converter comprises a rectification and inversion module and a control module. The rectification and inversion module and the control module are both connected with an AC bus and a DC bus. The bus capacitor is connected with the DC bus. An electric energy flow direction control terminal of the control module is connected with a controlled terminal of the rectification and inversion module. In the circuit, the control module can enable the rectification and inversion module to work in a rectification state or an inversion state based on the magnitude of voltage of the DC bus. The circuit is applied to the AC-DC exchange control micro power grid and combined with a set threshold formation AC-DC exchange control method, thereby bettering realizing the automatic control of the electric energy flow direction between the AC bus and the DC bus and greatly improving the stability of the AC-DC exchange control micro power grid.
Description
Technical field
The utility model belongs to mains supply field, particularly a kind of alternating current-direct current intercommunication control circuit and micro-electrical network.
Background technology
The operating current of the power consumption equipments such as the computer, TV, LED lighting, convertible frequency air-conditioner, frequency conversion refrigerator that people's everyday life uses is direct current, and these operating currents are all to process and obtain by electric main being carried out to rectification.Its reason is that existing electrical network is to adopt High Level AC Voltage transmission of electric energy, can effectively reduce the loss in power delivery process like this.But, because general residential electricity consumption equipment is main mainly with direct current, in being converted to galvanic process, alternating current will certainly cause some waste of energy.
In recent years, the new forms of energy such as solar cell, fuel cell are more and more universal.In the time that new forms of energy are incorporated to existing AC network, the DC inverter that new forms of energy need to be produced is alternating current.It compares the also many electric energy conversions again of the conventional alternator energy, and the waste of energy causing is just more obvious.
Therefore,, under the promotion of new forms of energy application, the micro-electrical network of alternating current-direct current has obtained certain development.This slightly electrical network can with AC network co-ordination, and adapt to the need for electricity of load, thereby avoided the waste of energy that repeatedly electric energy conversion is brought.But, this place that electrical network still comes with some shortcomings slightly, the direct current network of most importantly being powered by grid-connected power generation system has unsteadiness and fluctuation, and between AC network and direct current network, cannot realize the automatic control of power flow, cause the micro-mains supply of alternating current-direct current unstable.
In sum, there is between AC network and direct current network the problem that cannot automatic control electric can flow in the micro-electrical network of existing alternating current-direct current.
Utility model content
The purpose of this utility model is to provide a kind of alternating current-direct current intercommunication control circuit, is intended to solve the micro-electrical network of existing alternating current-direct current and has between AC network and direct current network the problem that cannot automatic control electric can flow to.
The utility model is achieved in that a kind of alternating current-direct current intercommunication control circuit, connects ac bus and DC bus, and described alternating current-direct current intercommunication control circuit comprises:
Alternating current-direct current intercommunication converter, exchanges end and is connected respectively described ac bus and described DC bus with DC terminal;
Bus capacitor, connects described DC bus;
Described alternating current-direct current intercommunication converter comprises commutation inversion module and control module;
The interchange end of described commutation inversion module connects with the alternating current test side of described control module the end that exchanges that forms alternating current-direct current intercommunication converter altogether, the direct current test side of the DC terminal of described commutation inversion module and described control module connects the DC terminal that forms described alternating current-direct current intercommunication converter altogether, and the power flow control end of described control module connects the controlled end of described commutation inversion module.
Another object of the present utility model is also to provide a kind of alternating current-direct current intercommunication micro-electrical network, comprises DC bus, ac bus, DC generation module and alternative electric generation module; Described DC bus connects described DC generation module and DC load, and described ac bus connects described alternative electric generation module, AC load and electric main electrical network;
The micro-electrical network of described alternating current-direct current intercommunication also comprises above-mentioned alternating current-direct current intercommunication control circuit, and exchanges the monitoring module that monitoring client and direct-current supervision end are connected respectively described ac bus and described DC bus.
The utility model provides alternating current-direct current intercommunication control circuit to comprise alternating current-direct current intercommunication converter and bus capacitor, and wherein alternating current-direct current intercommunication converter comprises commutation inversion module and control module; Commutation inversion module is all connected ac bus and DC bus with control module, and bus capacitor connects DC bus, and the power flow control end of control module connects the controlled end of commutation inversion module.In this circuit, control module can make commutation inversion module work in rectification state or inverter mode according to the voltage swing of DC bus.Be applied in the micro-electrical network of alternating current-direct current intercommunication, form alternating current-direct current intercommunication control method in conjunction with the threshold value of setting, more can realize the automatic control of power flow between ac bus and DC bus, greatly improve the stability of the micro-electrical network of alternating current-direct current intercommunication.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the alternating current-direct current intercommunication control circuit that provides of the utility model the first embodiment;
Fig. 2 is the exemplary circuit structure chart of the rectification filtering module that provides of the utility model the first embodiment;
Fig. 3 is the exemplary circuit structure chart of the rectification filtering module that provides of the utility model the second embodiment;
Fig. 4 is the modular structure figure of the micro-electrical network of alternating current-direct current intercommunication that provides of the utility model the 3rd embodiment;
Fig. 5 is the modular structure figure of the micro-electrical network of alternating current-direct current intercommunication that provides of the utility model the 4th embodiment;
Fig. 6 is the modular structure figure of the micro-electrical network of alternating current-direct current intercommunication that provides of the utility model the 5th embodiment;
Fig. 7 is the flowage structure figure of the alternating current-direct current intercommunication control method that provides of the utility model the 6th embodiment;
Fig. 8 is the flowage structure figure of the alternating current-direct current intercommunication control method that provides of the utility model the 7th embodiment;
Fig. 9 is the flowage structure figure of the alternating current-direct current intercommunication control method that provides of the utility model the 7th embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides alternating current-direct current intercommunication control circuit to comprise alternating current-direct current intercommunication converter and bus capacitor, and wherein alternating current-direct current intercommunication converter comprises commutation inversion module and control module; Commutation inversion module is all connected ac bus and DC bus with control module, and bus capacitor connects DC bus, and the power flow control end of control module connects the controlled end of commutation inversion module.Solve the micro-electrical network of existing alternating current-direct current and have between AC network and direct current network the problem that cannot automatic control electric can flow to.
Fig. 1 shows the modular structure of the alternating current-direct current intercommunication control circuit that the present embodiment provides, and for convenience of explanation, only shows the part relevant to the present embodiment, and details are as follows:
The alternating current-direct current intercommunication control circuit that the present embodiment provides connects ac bus 30 and DC bus 40.
Concrete, ac bus 30 can be the main traverse line of the electric energy transmitting of the AC network in the micro-electrical network of alternating current-direct current intercommunication, it has larger electric energy weight bearing power.Same, DC bus 40 can be the main traverse line of the electric energy transmitting of the direct current network in the micro-electrical network of alternating current-direct current intercommunication.
Concrete, alternating current-direct current intercommunication control circuit can comprise alternating current-direct current intercommunication converter 10 and bus capacitor 20.
Wherein, the interchange end of alternating current-direct current intercommunication converter 10 is connected respectively described ac bus 30 and described DC bus 40 with DC terminal, and bus capacitor 20 connects described DC bus 40.
In the present embodiment, alternating current-direct current intercommunication controller both can refer to can rectification work also can inversion work power equipment, as unit equipment of two-way inverter, inverter and rectification circuit etc.Alternating current-direct current intercommunication controller can, by detecting the voltage swing of DC bus 40, be adjusted the operating state of self, comprises rectification state, inverter mode and hot stand-by duty.
Wherein, rectification state is that the alternating current on ac bus 30 is carried out to rectification processing, and exports direct current to DC bus 40, and its power flow is that ac bus 30 is to DC bus 40; Inverter mode is that the direct current on DC bus 40 is carried out to inversion processing, and output AC electricity is to ac bus 30, and its power flow is that DC bus 40 is to ac bus 30; Hot stand-by duty is neither the alternating current on ac bus 30 to be carried out to rectification processing, also the direct current on DC bus 40 is not carried out to inversion processing, now between ac bus 30 and DC bus 40, there is no flow of electrical power.
The in the situation that of normal work, the magnitude of voltage on DC bus 40 is invariable, and after adding bus capacitor 20, the voltage on DC bus 40 will be followed the variation of the electric energy of institute's load on DC bus 40 and changed.In the time that the electric energy of institute's load on DC bus 40 is less, the magnitude of voltage on DC bus 40 is less; And in the time that the electric energy of institute's load on DC bus 40 is more, the magnitude of voltage on DC bus 40 is also larger.
Further, can set a upper voltage limit value V1 and a lower voltage limit value V2.
In the time that the magnitude of voltage on DC bus 40 is less than or equal to lower voltage limit value V2, alternating current-direct current intercommunication converter 10 enters rectification state; In the time that the magnitude of voltage on DC bus 40 is more than or equal to upper voltage limit value V1, alternating current-direct current intercommunication converter 10 enters inverter mode; In the time that the magnitude of voltage on DC bus 40 is between lower voltage limit value V2 and upper voltage limit value V1, alternating current-direct current intercommunication converter 10 enters hot stand-by duty.
Further, upper voltage limit value V1 can be 380V, and lower voltage limit value V1 can be 350V.
Further, alternating current-direct current intercommunication converter 10 comprises commutation inversion module 101 and control module 102.
Wherein, the interchange end of commutation inversion module 101 connects with the alternating current test side of control module 102 end that exchanges that forms alternating current-direct current intercommunication converter 10 altogether, the direct current test side of the DC terminal of commutation inversion module 101 and control module 102 connects the DC terminal that forms alternating current-direct current intercommunication converter 10 altogether, and the power flow control end of control module 102 connects the controlled end of commutation inversion module 101.
In the present embodiment, owing to having set up bus capacitor 20, make magnitude of voltage on DC bus 40 directly reflect the electric weight of institute's load on DC bus 40, make control module 102 can by detect magnitude of voltage on DC bus 40 judge electric energy on DC bus 40 be in not enough state, superfluous state or matching status, and according to judged result output SPWM(Sinusoidal Pulse Width Modulation, Using Sinusoidal Pulse Width Modulation) control signal to commutation inversion module 101, adjust in time the operating state of commutation inversion module 101, and then make from ac bus 30 export electric energy on DC bus 40 to make up the deficiency of its electric energy, or excessive electric energy is compensated on ac bus 30 so that electrical network is more stable, or stop power delivery.
Further, control module 102 can be that model is the processor of DSP28012 or DSP28035.
Concrete, control module 102, owing to need to realizing the function of voltage detecting, pwm control signal output, therefore needs to adopt to have analog-digital conversion function and programmable controller.
In the present embodiment, commutation inversion module 101 can comprise:
The first capacitor C 1, the second capacitor C 2, the first inductance L 1, the second inductance L 2, a NMOS pipe Q1, the 2nd NMOS pipe Q2, the 3rd NMOS pipe Q3, the 4th NMOS pipe Q4, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4;
The first end of the first capacitor C 1 connects altogether formation commutation inversion module 101 first with the first end of the first inductance L 1 and exchanges end, the second end of the first capacitor C 1 connects altogether second of formation commutation inversion module 101 with the first end of the second inductance L 2 and exchanges end, and first of commutation inversion module 101 exchanges end and exchanges the interchange end that end forms commutation inversion module 101 with second, the second end of the first inductance L 1, the source electrode of the one NMOS pipe Q1, the drain electrode of the 3rd NMOS pipe Q3, the anode of the first diode D1 is connected to the negative electrode of the 3rd diode D3 altogether, the second end of the second inductance L 2, the source electrode of the 2nd NMOS pipe Q2, the drain electrode of the 4th NMOS pipe Q4, the anode of the second diode D2 is connected to the negative electrode of the 4th diode D4 altogether, the drain electrode of a NMOS pipe Q1, the negative electrode of the first diode D1, the drain electrode of the 2nd NMOS pipe Q2, the first end of the negative electrode of the second diode D2 and the second capacitor C 2 connects the first DC terminal that forms commutation inversion module 101 altogether, the source electrode of the 3rd NMOS pipe Q3, the anode of the 3rd diode D3, the source electrode of the 4th NMOS pipe Q4, the second end of the anode of the 4th diode D4 and the second capacitor C 2 connects the second DC terminal that forms commutation inversion module 101 altogether, the DC terminal of the first DC terminal of commutation inversion module 101 and the second DC terminal composition commutation inversion module 101, the grid of a NMOS pipe Q1, the grid of the 2nd NMOS pipe Q2, the controlled end of the grid composition commutation inversion module 101 of the grid of the 3rd NMOS pipe Q3 and the 4th NMOS pipe Q4.
In the present embodiment, the SPWM signal that control module 102 is exported can be for multiple, and access respectively the grid of a NMOS pipe Q1, grid, the grid of the 3rd NMOS pipe Q3 and the grid of the 4th NMOS pipe Q4 of the 2nd NMOS pipe Q2, each NMOS pipe is realized break-make according to received SPWM signal, make commutation inversion module 101 carry out rectification or inversion operation, or quit work.
Further, as shown in Figure 3, bus capacitor 20 can be the first DC terminal and the second DC terminal that positive pole and the negative pole of the 3rd capacitor C 3, the three capacitor C 3 is connected respectively commutation inversion module 101.
Concrete, the 3rd capacitor C 3 can adopt alminium electrolytic condenser or tantalum electrochemical capacitor, and its withstand voltage can be set according to the maximum voltage of DC bus 40.For example, the maximum voltage of DC bus 40 is got 380V, and the withstand voltage of bus capacitor 20 can be got 450V.
embodiment 2
The enforcement of the present embodiment is based upon on the basis of above-described embodiment.
In the present embodiment, bus capacitor 20 also can adopt polarity free capacitor, and is installed on commutation inversion module 101 inside.
Concrete, as shown in Figure 3, commutation inversion module 101 can comprise:
The first capacitor C 1, the first inductance L 1, the second inductance L 2, a NMOS pipe Q1, the 2nd NMOS pipe Q2, the 3rd NMOS pipe Q3, the 4th NMOS pipe Q4, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4;
The first end of the first capacitor C 1 connects altogether formation commutation inversion module 101 first with the first end of the first inductance L 1 and exchanges end, the second end of the first capacitor C 1 connects altogether second of formation commutation inversion module 101 with the first end of the second inductance L 2 and exchanges end, and first of commutation inversion module 101 exchanges end and exchanges the interchange end that end forms commutation inversion module 101 with second, the second end of the first inductance L 1, the source electrode of the one NMOS pipe Q1, the drain electrode of the 3rd NMOS pipe Q3, the anode of the first diode D1 is connected to the negative electrode of the 3rd diode D3 altogether, the second end of the second inductance L 2, the source electrode of the 2nd NMOS pipe Q2, the drain electrode of the 4th NMOS pipe Q4, the anode of the second diode D2 is connected to the negative electrode of the 4th diode D4 altogether, the drain electrode of a NMOS pipe Q1, the negative electrode of the first diode D1, the 2nd NMOS pipe drain electrode of Q2 and the negative electrode of the second diode D2 connect the first DC terminal that forms commutation inversion module 101 altogether, the source electrode of the 3rd NMOS pipe Q3, the anode of the 3rd diode D3, the 4th NMOS pipe source electrode of Q4 and the anode of the 4th diode D4 connect the second DC terminal that forms commutation inversion module 101 altogether, the DC terminal of the first DC terminal of commutation inversion module 101 and the second DC terminal composition commutation inversion module 101, the grid of a NMOS pipe Q1, the grid of the 2nd NMOS pipe Q2, the controlled end of the grid composition commutation inversion module 101 of the grid of the 3rd NMOS pipe Q3 and the 4th NMOS pipe Q4.
embodiment 3
The enforcement of the present embodiment is based upon on the basis of above-described embodiment
Fig. 4 shows the modular structure of the micro-electrical network of alternating current-direct current intercommunication that the present embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model, and details are as follows:
The micro-electrical network of alternating current-direct current intercommunication that the present embodiment provides comprises DC bus 40, ac bus 30, DC generation module 80 and alternative electric generation module 60; DC bus 40 connects DC generation module 80 and DC load 70, and ac bus 30 connects alternative electric generation module 60, AC load 50 and electric main electrical network 90.
In the present embodiment, DC generation module 80 can adopt photovoltaic DC electricity generation system, and it is made up of photovoltaic array and photovoltaic controller.Alternative electric generation module 60 can adopt the alternating current power-generating system of wind generator system and so on.DC load 70 is the electrical appliance that directly utilizes direct current work, and 50 of AC load are the electrical appliance that directly utilizes alternating current work.
Further, the micro-electrical network of alternating current-direct current intercommunication can also comprise above-mentioned alternating current-direct current intercommunication control circuit.
In the present embodiment, alternating current-direct current intercommunication control circuit adopts the annexation described in embodiment 1, the interchange end that is alternating current-direct current intercommunication converter 10 is connected respectively described ac bus 30 and described DC bus 40 with DC terminal, and bus capacitor 20 connects described DC bus 40.
Further, the micro-electrical network of alternating current-direct current intercommunication can also comprise that interchange monitoring client and direct-current supervision end are connected respectively the monitoring module 110 of described ac bus 30 and described DC bus 40.
In the present embodiment, monitoring module 110 can adopt supervisory control system and the software kit take electronic computer as core.User is by monitoring module 110, running status that can the micro-electrical network of remote monitoring alternating current-direct current intercommunication.Concrete, monitoring module 110 can be by gathering information of voltage and the current information etc. on ac bus 30 and DC bus 40, directly obtain magnitude of voltage, current value on ac bus 30 and DC bus 40, and further obtain frequency values and the harmonic wave of voltage and electric current, to monitor operating state of each equipment etc.To occur abnormal in the situation that at micro-electrical network, user can make reflection in time, avoids occurring larger loss.
embodiment 4
The enforcement of the present embodiment is based upon on the basis of above-described embodiment
In the present embodiment, as shown in Figure 5, the micro-electrical network of alternating current-direct current intercommunication can also comprise the first switch 120 being serially connected with between electric main electrical network 90 and ac bus 30.
Concrete, the first switch 120 can adopt relay; Its first end connects the power network switch control end of the controlled end link control module 102 of the second end connection ac bus 30, the first switches 120 of electric main electrical network 90, the first switches 120.
In the present embodiment, if electric main electrical network 90 power down, the interchange monitoring client no-voltage input of monitoring module 110, send and control signal to the first switch 120, the first switch 120 is disconnected, thereby electric main electrical network 90 and micro-electrical network are departed from, and then make micro-electrical network independent operating, avoid electric energy to run off.
Further, the micro-electrical network of alternating current-direct current intercommunication also comprises the energy-storage module 100 being connected with DC bus 40.
In the present embodiment, emergency power supply when energy-storage module 100 can be used as 90 power down of electric main electrical network.Concrete, energy-storage module 100 can, in the time that alternating current-direct current intercommunication electric energy that micro-electrical network produces (being the electric energy that alternative electric generation module 60 and DC generation module 80 produce) is not enough to meet the demand of the micro-electrical network load of alternating current-direct current intercommunication (being AC load 50 and DC load 70), provide electric energy to the micro-electrical network of alternating current-direct current intercommunication; Or in the time that alternating current-direct current intercommunication electric energy that micro-electrical network produces is greater than the energy demand of the micro-electrical network load of alternating current-direct current intercommunication, obtain electric energy by the micro-electrical network of alternating current-direct current intercommunication, carry out energy reserve, in order to using.
Further, the micro-electrical network of alternating current-direct current intercommunication also comprises the second switch 130 being serially connected with between energy-storage module 100 and DC bus 40;
Concrete, second switch 130 can adopt relay; Its first end connects energy-storage module 100, and the second end of second switch 130 connects DC bus 40, the energy storage switch control end of the controlled end link control module 102 of second switch 130.
In the present embodiment, the demand whether alternating current-direct current intercommunication electric energy that micro-electrical network produces meets the micro-electrical network load of alternating current-direct current intercommunication is directly reflected on the voltage of DC bus 40, the judgement that monitoring module 110 can be correlated with by the voltage on monitoring DC bus 40.Its basis for estimation can be with reference to the judgement of control module 102 in embodiment 1, and details are as follows:
Can adopt upper voltage limit value V1 and lower voltage limit value V2 in embodiment 1.
In the time that the magnitude of voltage on DC bus 40 is less than or equal to lower voltage limit value V2, second switch 130 conductings, energy-storage module 100 is powered to DC bus 40; In the time that the magnitude of voltage on DC bus 40 is more than or equal to upper voltage limit value V1, second switch 130 conductings, energy-storage module 100 enters charged state.
In addition, in the time that the magnitude of voltage on DC bus 40 is between lower voltage limit value V2 and upper voltage limit value V1, second switch 130 disconnects.
Further, in the time that the state-of-charge of energy-storage module 100 is less than charged lower limit, second switch 130 disconnects, and energy-storage module 100 is stopped power supply; In the time that the state-of-charge of energy-storage module 100 is greater than charged higher limit, second switch 130 disconnects, and energy-storage module 100 stops charging.
Concrete, energy-storage module 100 can be 360V lithium battery group for output voltage, its state-of-charge upper limit and state-of-charge lower limit can be set as respectively 80% and 20% of the maximum energy storage capacity of lithium battery group.
embodiment 5
The enforcement of the present embodiment is based upon on the basis of above-described embodiment.
In the present embodiment, as shown in Figure 6, the micro-electrical network of alternating current-direct current intercommunication can also comprise the 3rd switch 140, the 4th switch 150 and the 5th switch 160;
Concrete, the 3rd switch 140 is serially connected with between alternative electric generation module 60 and ac bus 30, and the 4th switch 150 is serially connected with between ac bus 30 and alternating current-direct current intercommunication converter 10, and the 5th switch 160 is serially connected with between DC generation module 80 and DC bus 40.
In the present embodiment, the 3rd switch 140, the 4th switch 150 and the 5th switch 160 are conductings under normal condition, in the time that the micro-electrical network of alternating current-direct current or equipment need to overhaul, can disconnect corresponding switch, to ensure the safety of maintainer and equipment.
embodiment 6
The enforcement of the present embodiment is based upon on the basis of above-described embodiment.
Fig. 7 shows the flowage structure figure of the alternating current-direct current intercommunication control method that the present embodiment provides, and for convenience of explanation, only shows the part relevant to the present embodiment, and details are as follows:
The alternating current-direct current intercommunication control method that the present embodiment provides comprises the following steps:
S10, control module 102 judge that magnitude of voltage on DC bus 40 whether between lower voltage limit value and upper voltage limit value, if perform step S20, performs step S30 if not;
S20, commutation inversion module 101 quit work, execution step S10;
S30, control module 102 judge whether the magnitude of voltage on DC bus 40 is more than or equal to upper voltage limit value, if perform step S40, perform step if not S50;
S40, commutation inversion module 101 carry out inversion processing to the direct current on DC bus 40, and output on ac bus 30, execution step S10;
S50, commutation inversion module 101 carry out rectification processing to the alternating current on ac bus 30, and output on DC bus 40, execution step S10.
In the present embodiment, the same with embodiment 1, in the time that the magnitude of voltage on DC bus 40 is less than or equal to lower voltage limit value V2, alternating current-direct current intercommunication converter 10 enters rectification state, be that commutation inversion module 101 carries out rectification processing to the alternating current on ac bus 30, and output on DC bus 40; In the time that the magnitude of voltage on DC bus 40 is more than or equal to upper voltage limit value V1, alternating current-direct current intercommunication converter 10 enters inverter mode, and commutation inversion module 101 carries out inversion processing to the direct current on DC bus 40, and outputs on ac bus 30; In the time that the magnitude of voltage on DC bus 40 is between lower voltage limit value V2 and upper voltage limit value V1, alternating current-direct current intercommunication converter 10 enters hot stand-by duty, and commutation inversion module 101 quits work.
embodiment 7
The enforcement of the present embodiment is based upon on the basis of above-described embodiment
In the present embodiment, as shown in Figure 8, in the time performing step S10 to step S50, alternating current-direct current intercommunication control method can also comprise the following steps:
S60, monitoring module 110 judge whether power down of electric main electrical network 90, if perform step S70;
S70, monitoring module 110 are controlled the first switch 120 and are disconnected;
S80, monitoring module 110 judge that magnitude of voltage on DC bus 40 whether between lower voltage limit value and upper voltage limit value, if perform step S10, performs step S90 if not;
S90, monitoring module 110 call memory module, execution step S10.
In the present embodiment, step S60 interrupts as one the step of processing, no matter the micro-electrical network of alternating current-direct current intercommunication in step S10 any time to step S50, as long as electric main electrical network 90 enters power-down state, monitoring module 110 will perform step S70 immediately.Due to the emergency power supply of energy-storage module 100 can be for 90 power down of electric main electrical network time.Therefore, in 90 power down of electric main electrical network, monitoring module 110 is first controlled the first switch 120 and is disconnected, and the micro-electrical network of alternating current-direct current intercommunication is worked alone.If when now the magnitude of voltage on DC bus 40 is not between lower voltage limit value and upper voltage limit value, the superfluous or not enough state in electric energy of the micro-electrical network of alternating current-direct current intercommunication is described, need to call memory module and maintain the stable of the micro-electrical network of alternating current-direct current intercommunication.Therefore, monitoring module 110 can call memory module by controlling second switch 130.
Further, as shown in Figure 9, step S90 specifically can comprise:
Whether the state-of-charge of S91, monitoring module 110 detection of stored modules between charged lower limit and charged higher limit, if perform step S92, performs step S93 if not;
S92, monitoring module 110 are controlled second switch 130 conductings, execution step S10;
S93, monitoring module 110 are controlled second switch 130 and are disconnected, execution step S10.
In the present embodiment, in order further to protect energy-storage module 100, extend the useful life of energy-storage module 100.In the time that the state-of-charge of energy-storage module 100 is less than charged lower limit, second switch 130 disconnects, and energy-storage module 100 is stopped power supply; In the time that the state-of-charge of energy-storage module 100 is greater than charged higher limit, second switch 130 disconnects, and energy-storage module 100 stops charging.
In the present embodiment, alternating current-direct current intercommunication control circuit is applied in the micro-electrical network of alternating current-direct current intercommunication, form alternating current-direct current intercommunication control method in conjunction with the threshold value of setting, more can realize the automatic control of power flow between ac bus 30 and DC bus 40, greatly improve the stability of the micro-electrical network of alternating current-direct current intercommunication.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (6)
1. an alternating current-direct current intercommunication control circuit, connects ac bus and DC bus, it is characterized in that, described alternating current-direct current intercommunication control circuit comprises:
Alternating current-direct current intercommunication converter, exchanges end and is connected respectively described ac bus and described DC bus with DC terminal;
Bus capacitor, connects described DC bus;
Described alternating current-direct current intercommunication converter comprises commutation inversion module and control module;
The interchange end of described commutation inversion module connects with the alternating current test side of described control module the end that exchanges that forms alternating current-direct current intercommunication converter altogether, the direct current test side of the DC terminal of described commutation inversion module and described control module connects the DC terminal that forms described alternating current-direct current intercommunication converter altogether, and the power flow control end of described control module connects the controlled end of described commutation inversion module.
2. alternating current-direct current intercommunication control circuit as claimed in claim 1, is characterized in that, described commutation inversion module comprises:
The first electric capacity, the second electric capacity, the first inductance, the second inductance, a NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS pipe, the 4th NMOS pipe, the first diode, the second diode, the 3rd diode and the 4th diode;
The first end of described the first electric capacity connects altogether formation described commutation inversion module first with the first end of described the first inductance and exchanges end, the second end of described the first electric capacity connects altogether second of the described commutation inversion module of formation with the first end of described the second inductance and exchanges end, and first of described commutation inversion module exchanges end and exchanges the interchange end that end forms described commutation inversion module with second, the second end of described the first inductance, the source electrode of a described NMOS pipe, the drain electrode of described the 3rd NMOS pipe, the anode of described the first diode is connected to the negative electrode of described the 3rd diode altogether, the second end of described the second inductance, the source electrode of described the 2nd NMOS pipe, the drain electrode of described the 4th NMOS pipe, the anode of described the second diode is connected to the negative electrode of described the 4th diode altogether, the drain electrode of a described NMOS pipe, the negative electrode of described the first diode, the drain electrode of described the 2nd NMOS pipe, the first end of the negative electrode of described the second diode and described the second electric capacity connects the first DC terminal that forms described commutation inversion module, the source electrode of described the 3rd NMOS pipe altogether, the anode of described the 3rd diode, the source electrode of described the 4th NMOS pipe, the second end of the anode of described the 4th diode and described the second electric capacity connects the second DC terminal that forms described commutation inversion module altogether, the first DC terminal of described commutation inversion module and the second DC terminal form the DC terminal of described commutation inversion module, the grid of a described NMOS pipe, the grid of described the 2nd NMOS pipe, the grid of the grid of described the 3rd NMOS pipe and described the 4th NMOS pipe forms the controlled end of described commutation inversion module.
3. the micro-electrical network of alternating current-direct current intercommunication, comprises DC bus, ac bus, DC generation module and alternative electric generation module; Described DC bus connects described DC generation module and DC load, and described ac bus connects described alternative electric generation module, AC load and electric main electrical network; It is characterized in that:
The micro-electrical network of described alternating current-direct current intercommunication also comprises alternating current-direct current intercommunication control circuit as claimed in claim 1, and exchanges the monitoring module that monitoring client and direct-current supervision end are connected respectively described ac bus and described DC bus.
4. the micro-electrical network of alternating current-direct current intercommunication as claimed in claim 3, is characterized in that, the micro-electrical network of described alternating current-direct current intercommunication also comprises the first switch being serially connected with between described electric main electrical network and described ac bus;
The first end of described the first switch connects described electric main electrical network, and the second end of described the first switch connects described ac bus, and the controlled end of described the first switch connects the power network switch control end of described monitoring module.
5. the micro-electrical network of alternating current-direct current intercommunication as claimed in claim 4, is characterized in that, the micro-electrical network of described alternating current-direct current intercommunication also comprises the energy-storage module being connected with described DC bus.
6. the micro-electrical network of alternating current-direct current intercommunication as claimed in claim 5, is characterized in that, the micro-electrical network of described alternating current-direct current intercommunication also comprises the second switch being serially connected with between described energy-storage module and described DC bus;
The first end of described second switch connects described energy-storage module, and the second end of described second switch connects described DC bus, and the controlled end of described second switch connects the energy storage switch control end of described monitoring module.
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| CN201420011234.1U CN203690945U (en) | 2014-01-08 | 2014-01-08 | AC-DC exchange control circuit and micro power grid |
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| CN201420011234.1U CN203690945U (en) | 2014-01-08 | 2014-01-08 | AC-DC exchange control circuit and micro power grid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015103907A1 (en) * | 2014-01-08 | 2015-07-16 | 深圳桑达国际电源科技有限公司 | Alternating current and direct current interworking control circuit, micro grid and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015103907A1 (en) * | 2014-01-08 | 2015-07-16 | 深圳桑达国际电源科技有限公司 | Alternating current and direct current interworking control circuit, micro grid and control method |
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