CN202906781U - Bidirectional energy storage inverter used for grid-connected system - Google Patents
Bidirectional energy storage inverter used for grid-connected system Download PDFInfo
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- CN202906781U CN202906781U CN 201220626624 CN201220626624U CN202906781U CN 202906781 U CN202906781 U CN 202906781U CN 201220626624 CN201220626624 CN 201220626624 CN 201220626624 U CN201220626624 U CN 201220626624U CN 202906781 U CN202906781 U CN 202906781U
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Abstract
The utility model relates to a bidirectional energy storage inverter used for a grid-connected system. The bidirectional energy storage inverter comprises bidirectional inverter circuits and a sampling control circuit. An input terminal of the each bidirectional inverter circuit is connected to an energy storage cell. An output terminal is connected to a public power network, a grid-connected inverter and a load through a switch switching circuit. A transformer is connected between the output terminal of the each bidirectional inverter circuit and the switch switching circuit. There are at least two bidirectional inverter circuits which are arranged in parallel. The input terminals of the two bidirectional inverter circuits are connected to the energy storage cell respectively and the output terminals are connected to different windings of a primary side of the transformer. A secondary side of the transformer is connected to the switch switching circuit. After the public power network is disconnected and the grid-connected inverter is reconnected, if a generated electric quantity is more than a load demand, the sampling control circuit makes the one bidirectional inverter circuit work under an inversion state and the other bidirectional inverter circuit work under a rectification state.
Description
Technical field
The invention relates to grid-connected system, is specifically related to bidirectional energy-storage inverter wherein.
Background technology
In distributed generation system, what extensively adopt now is the grid type inverter, generally adopts current-mode control, and namely combining inverter is current source.The energy of combining inverter can be from wind energy, photovoltaic module or bio-battery etc., during generating output and electrical network with the electric current of same frequency to utility network; The just output current of combining inverter control, the voltage of utility network is then controlled by grid company.When the operational factor of utility network exceeded the claimed range of combining inverter or utility network outage, combining inverter will be automatically and the utility network disconnection, stops to generate electricity.For this reason, generally need a bidirectional energy-storage inverter is installed: when utility network normally connects, the combining inverter normal operation, the bidirectional energy-storage inverter works in rectification state, is the energy-storage battery charging; When utility network cut off the power supply, two-way inverter worked in inverter mode, adopted voltage-type control, the sine wave output alternating voltage, and combining inverter is incorporated into the power networks as the basis take this local minor scale power net, is load supplying together.If the energy that produce this moment is more than loading demand, because existing two-way inverter can only work in a kind of state at synchronization, can not rectification in inversion, unnecessary energy just can't be used for charging to energy-storage battery, have to adopt the power output of other way restriction combining inverter, unnecessary energy dissipation is fallen.
Summary of the invention
The invention provides the bidirectional energy-storage inverter for grid-connected system, disconnects and after combining inverter accesses again the problem that the electric weight of generation causes more than loading demand to solve at utility network.
Provide the bidirectional energy-storage inverter for grid-connected system for this reason, comprise two-way inverter circuit and sampling control circuit;
Two-way inverter circuit input is access to energy-storage battery, output is access to utility network, combining inverter and load through switch switching circuit, particularly, between two-way inverter circuit output and switch switching circuit, be connected to transformer, two-way inverter circuit has arranged side by side at least two, two two-way inverter circuit inputs are access to respectively energy-storage battery, and output is access to respectively the different windings of transformer primary side, and the transformer secondary is access to switch switching circuit;
Utility network normally connects then sampling control circuit and controls two-way inverter circuit and be operated in rectification state, charge to energy-storage battery, thereby utility network disconnects then sampling control circuit and controls two-way inverter circuit and be operated in inverter mode and provide the basis of being incorporated into the power networks for combining inverter, disconnect and after combining inverter accesses again at utility network, if the electric weight that produces is more than loading demand, then sampling control circuit is controlled one of them two-way inverter circuit and is operated in inverter mode to keep the basis of being incorporated into the power networks of combining inverter, another two-way inverter circuit is operated in rectification state, and unnecessary electric weight is stored in the energy-storage battery.
Because two-way inverter circuit has arranged side by side two, sampling control circuit just can be controlled one of them two-way inverter circuit and be operated in inverter mode to keep the basis of being incorporated into the power networks of combining inverter, another two-way inverter circuit is operated in rectification state, unnecessary electric weight is filled with in energy-storage battery, need not to limit the power output of combining inverter, avoided the waste of excess energy.
As for disconnecting at utility network but combining inverter when not yet again accessing, sampling control circuit can be controlled two two-way inverter circuits and all be operated in inverter mode, to provide the basis of being incorporated into the power networks as combining inverter as early as possible, combining inverter can again be accessed as early as possible.
As for when utility network normally connects, sampling control circuit can be controlled two two-way inverter circuits and all be operated in rectification state, to improve charge efficiency.
Description of drawings
Fig. 1 is the structured flowchart of grid-connected system.
Fig. 2 is the circuit diagram of bidirectional energy-storage inverter.
Fig. 3 is the circuit diagram of another kind of bidirectional energy-storage inverter.
Embodiment
As shown in Figure 1, two-way inverter circuit 1 and two-way inverter circuit 2 are arranged side by side, and their input is access to respectively energy-storage battery, and their output is connection transformer former limit winding N2 and N3 respectively; Transformer secondary winding N1 is the output of bidirectional energy-storage inverter.Transformer is used for the mutual transmission of energy and the isolation of input-output, is with two two-way inverter circuits 1,2 core parts of combining.Sampling and control circuit sample respectively input voltage, electric current, the parameters such as output voltage, electric current, output pwm signal, the operation of control circuit.The transformer secondary is access to switch switching circuit, and there is testing circuit switch switching circuit inside, changes the connection status of system according to the state of utility network and load.The energy of combining inverter can be from wind energy, photovoltaic module or bio-battery etc.
When utility network normally connected, switch switching circuit linked together bidirectional energy-storage inverter, load and utility network.When combining inverter can be exported enough energy, switch switching circuit allows combining inverter connect utility network, two two-way inverter circuits 1 of sampling control circuit control this moment, 2 all are operated in rectification state, to the energy-storage battery charging, this moment, energy flowed to energy-storage battery from the utility network side through the bidirectional energy-storage inverter.
When the operational factor that shares electrical network surpasses system requirements or utility network outage, switch switching circuit will disconnect utility network, this moment, combining inverter self will disconnect and being connected of system because detecting without electrical network, enter so-called island state, stop generating, so two two-way inverter circuits 1 of sampling control circuit control, 2 all are operated in inverter mode, it is load supplying that the output AC electricity forms local minor scale power net, energy just flows to load from energy-storage battery through the bidirectional energy-storage inverter, combining inverter detects this local minor scale power net, just can start in the short period of time and be connected to this local minor scale power net, be load supplying with the bidirectional energy-storage inverter.If the energy that combining inverter produces is more than loading demand, sampling control circuit just control two-way inverter circuit 1 maintenance work at inverter mode to keep local minor scale power net, and controlling two-way inverter circuit 2, to change rectification state into by inverter mode be energy-storage battery charging, unnecessary energy storage is got up, this moment, energy mainly was to flow to battery from combining inverter after bidirectional energy-storage inverter conversion, with combining inverter produce more than the energy storage of loading demand at battery.Under this situation, the two-way inverter circuit 1 that works in inverter mode mainly works to keep local minor scale power net, and the energy of load consumption is mainly provided by combining inverter.
Each two-way inverter circuit all has two kinds of operating states, i.e. inverter mode and rectification state.Two two-way inverter circuits are combined and can be formed three kinds of effective mode of operations, that is: inversion+rectification, inversion+inversion, rectification+rectification.Three kinds of mode of operations are switched according to system status by sampling and the control circuit of bidirectional energy-storage inverter, by controlling two-way inverter circuit 1 and two-way inverter circuit 2 works in inverter mode respectively or rectification state is realized.
A kind of case study on implementation as shown in Figure 2, the bidirectional energy-storage inverter comprises input capacitance Cap, two two-way inverter circuit, Industrial Frequency Transformer and sampling control circuits that circuit structure is identical.Two-way inverter circuit 1 comprises that the DC/DC converter that is comprised of input inductance M1_L1, switching tube M1_Q1, switching tube M1_Q2 and electric capacity M1_bus, the full-bridge converter that is comprised of M1_Q3, M1_Q4, M1_Q5, M1_Q6 reach the filter that is comprised of inductance M1_L2, electric capacity M1_C1; Two-way inverter circuit 2 comprises that also the DC/DC converter that is comprised of input inductance M2_L1, switching tube M2_Q1, switching tube M2_Q2 and electric capacity M1_bus, the full-bridge converter that is comprised of M2_Q3, M2_Q4, M2_Q5, M2_Q6 reach the filter that is comprised of inductance M2_L2, electric capacity M2_C1.The output of two-way inverter circuit 1 and two-way inverter circuit 2 is connected respectively to N2 and the N3 winding of transformer, and transformer N1 winding is the output of bidirectional energy-storage inverter.
As shown in Figure 2, now introduce operational mode as an example of two-way inverter circuit 1 example.When two-way inverter circuit 1 works in inverter mode, the DC/DC converter that is comprised of input inductance L 1, switching tube M1_Q1, switching tube M1_Q2 and electric capacity M1_bus works in boost mode, switching tube M1_Q2 is modulated by PWM, switching tube M1_Q1 is in closed condition, but body diode is in running order.Voltage battery is lower by this booster circuit raises, and the voltage of sampling capacitance M1_bus is regulated PWM simultaneously, makes the voltage of electric capacity M1_bus be in a stationary value.Modulated respectively sine wave output alternating current after LC filtering, transformer isolation are boosted by 4 road PWM by the full-bridge converter that M1_Q3, M1_Q4, M1_Q5, M1_Q6 form.Energy is flowed out by battery, is reverse into alternating current behind two-way inverter circuit, is load supplying after the Industrial Frequency Transformer isolation again.
When working in filter state, M1_Q3, M1_Q4, M1_Q5, M1_Q6 all are in closed condition, alternating current forms direct current through electric capacity M1_bus filtering again after the full-bridge rectification of the body diode formation of these 4 switching tubes, by switching tube M1_Q1, switching tube M1_Q2, the DC that forms of input inductance L 1 the DC converter work in decompression mode, switching tube M1_Q1 is modulated by PWM, be on off state, switching tube M1_Q2 is in closed condition, but body diode is in running order.By the lower voltage of this reduction voltage circuit with electric capacity M1_bus, regulate PWM control battery charging process by electric current and the cell voltage of sampling input inductance L 1.Energy from grid side through after the conversion of two-way inverter circuit, charging for battery again behind the transformer.
Two kinds of mode of operation control modes of two-way inverter circuit 2 are identical with two-way changing circuit 1.
Another kind of case study on implementation as shown in Figure 3, the bidirectional energy-storage inverter comprises input capacitance Cap, two two-way inverter circuit, Industrial Frequency Transformer and sampling control circuits that circuit structure is identical; Two-way inverter circuit 1 comprises the full-bridge converter that is comprised of M1_Q3, M1_Q4, M1_Q5, M1_Q6 and the filter that is comprised of inductance M1_L2, electric capacity M1_C1; Equally, two-way inverter circuit 2 also comprises the full-bridge converter that is comprised of M2_Q3, M2_Q4, M2_Q5, M2_Q6 and the filter that is comprised of inductance M2_L2, electric capacity M2_C1.
As shown in Figure 3, now introduce operational mode as an example of two-way changing circuit 1 example.When working in inverter mode, modulated by 4 road PWM respectively by the full-bridge converter that M1_Q3, M1_Q4, M1_Q5, M1_Q6 form, the sine wave output alternating current is load supplying after LC filtering, transformer isolation are boosted.
When working in filter state, two upper pipe M1_Q3, M1_Q5 of full-bridge converter are in closed condition, but body diode is in running order, and two lower pipe M1_Q4, M1_Q6 of full-bridge converter are modulated respectively the control battery charging process by two-way PWM.
Two kinds of mode of operation control modes of two-way changing circuit 2 are identical with two-way changing circuit 1.
Claims (3)
1. be used for the bidirectional energy-storage inverter of grid-connected system, comprise two-way inverter circuit and sampling control circuit;
Two-way inverter circuit input is access to energy-storage battery, and output is access to utility network, combining inverter and load through switch switching circuit;
Utility network normally connects then sampling control circuit to be controlled two-way inverter circuit and is operated in rectification state, and utility network disconnects then sampling control circuit and controls two-way inverter circuit and be operated in inverter mode;
It is characterized in that:
Between two-way inverter circuit output and switch switching circuit, be connected to transformer, two-way inverter circuit has arranged side by side at least two, two two-way inverter circuit inputs are access to respectively energy-storage battery, output is access to respectively the different windings of transformer primary side, and the transformer secondary is access to switch switching circuit;
Disconnect and after combining inverter access again at utility network, if the electric weight of generation more than loading demand, then sampling control circuit is controlled one of them two-way inverter circuit and is operated in inverter mode, another two-way inverter circuit is operated in rectification state.
2. bidirectional energy-storage inverter according to claim 1 is characterized in that, disconnects but combining inverter when again not accessing at utility network, and two two-way inverter circuits of sampling control circuit control all are operated in inverter mode.
3. bidirectional energy-storage inverter according to claim 1 is characterized in that, utility network normally connects then two two-way inverter circuits of sampling control circuit control and all is operated in rectification state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220626624 CN202906781U (en) | 2012-11-23 | 2012-11-23 | Bidirectional energy storage inverter used for grid-connected system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220626624 CN202906781U (en) | 2012-11-23 | 2012-11-23 | Bidirectional energy storage inverter used for grid-connected system |
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| CN202906781U true CN202906781U (en) | 2013-04-24 |
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| CN 201220626624 Withdrawn - After Issue CN202906781U (en) | 2012-11-23 | 2012-11-23 | Bidirectional energy storage inverter used for grid-connected system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957335A (en) * | 2012-11-23 | 2013-03-06 | 广东易事特电源股份有限公司 | Bidirectional battery storage inverter used for grid-connected systems |
| CN110336483A (en) * | 2019-07-23 | 2019-10-15 | 深圳市三瑞电源有限公司 | A kind of two-way inverter |
| CN110336483B (en) * | 2019-07-23 | 2024-04-19 | 深圳市三瑞电源有限公司 | Bidirectional inverter |
-
2012
- 2012-11-23 CN CN 201220626624 patent/CN202906781U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957335A (en) * | 2012-11-23 | 2013-03-06 | 广东易事特电源股份有限公司 | Bidirectional battery storage inverter used for grid-connected systems |
| WO2014079268A1 (en) * | 2012-11-23 | 2014-05-30 | 广东易事特电源股份有限公司 | Bi-directional storing inverter used in grid connected power system |
| CN110336483A (en) * | 2019-07-23 | 2019-10-15 | 深圳市三瑞电源有限公司 | A kind of two-way inverter |
| CN110336483B (en) * | 2019-07-23 | 2024-04-19 | 深圳市三瑞电源有限公司 | Bidirectional inverter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130424 Effective date of abandoning: 20150318 |
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| RGAV | Abandon patent right to avoid regrant |