CN213547389U - Energy storage converter for restraining backward flow of power grid energy - Google Patents
Energy storage converter for restraining backward flow of power grid energy Download PDFInfo
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- CN213547389U CN213547389U CN202021688275.6U CN202021688275U CN213547389U CN 213547389 U CN213547389 U CN 213547389U CN 202021688275 U CN202021688275 U CN 202021688275U CN 213547389 U CN213547389 U CN 213547389U
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Abstract
The utility model is suitable for a converter technical field provides an energy storage converter for restraining electric wire netting energy to flow backward, include: the current converter is connected with the power grid end; the current limiting device is connected between the positive pole of the direct current end of the power supply and the current converter; a bidirectional switch connected in parallel with the current limiting device; and a control circuit respectively connected with the current limiting device, the bidirectional switch and the current converter or the power grid end; the control circuit comprises a control unit, a current detection unit or a first voltage detection unit or a second voltage detection unit connected with the control unit, and a driving unit respectively connected with the control unit and the bidirectional switch; the current detection unit is also connected with a direct current end of a power supply, the first voltage detection unit is respectively connected with the current converter and the bidirectional switch, and the second voltage detection unit is respectively connected with the current converter and a power grid end. The utility model discloses can improve energy storage converter's security and reduce energy storage converter's cost.
Description
Technical Field
The utility model belongs to the technical field of the converter, especially, relate to an energy storage converter for restraining electric wire netting energy to flow backward.
Background
The existing energy storage converter generally adopts a single-stage topology direct current side to directly connect an energy storage battery, and an alternating current side to directly connect a power grid. The topology is equivalent to three-phase uncontrolled rectification from the grid port to the battery port. When the peak value of the grid voltage is larger than the battery voltage, the backward current flows into the energy storage battery through the diode of the inverter bridge arm, as shown by the dotted line in fig. 1. The magnitude of the current flowing through the channel is not controlled. Therefore, the energy storage converter and the internal devices of the energy storage battery are easily damaged, and the fault is enlarged. Meanwhile, passive protection, that is, overcurrent protection by a fuse connected in series on the dc side, is generally adopted in the conventional scheme, as shown in fig. 2. However, the matching problem exists between the fuse and the anti-parallel diode of the bridge arm, the characteristics of fuses or diodes of different manufacturers are different, the matching difficulty is high, and the condition that the bridge arm diode is damaged due to the fact that the fuse does not act easily occurs. In addition, the frequency of overvoltage generation of the power grid is high, and if the overvoltage is protected by a fuse at each time, the cost of the system is high. Therefore, the converter in the prior art has the problems of low safety and high cost.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an energy storage converter for restraining electric wire netting energy backward flows aims at solving the problem that has the security low, with high costs among the prior art.
The embodiment of the utility model provides an energy storage converter for restraining electric wire netting energy to flow backward, an energy storage converter for restraining electric wire netting energy to flow backward includes: the current converter is connected with the power grid end; the current limiting device is connected between the positive electrode of the direct current end of the power supply and the current converter; a bidirectional switch connected in parallel with the current limiting device; and a control circuit respectively connected with the current limiting device, the bidirectional switch and the current converter or the power grid end; the control circuit comprises a control unit, a current detection unit or a first voltage detection unit or a second voltage detection unit connected with the control unit, and a driving unit respectively connected with the control unit and the bidirectional switch; the current detection unit is further connected with the direct current end of the power supply, the first voltage detection unit is respectively connected with the current converter and the bidirectional switch, and the second voltage detection unit is respectively connected with the current converter and the power grid end.
Further, the current limiting device comprises a current limiting resistor or a current limiting inductor.
Further, the bidirectional switch includes an electronic switch or a mechanical switch.
Still further, the mechanical switch includes a relay, or a contactor or a circuit breaker.
Furthermore, the electronic switch comprises an insulated gate bipolar transistor in reverse series connection, or an insulated gate bipolar transistor in reverse parallel connection, or a metal-oxide semiconductor field effect transistor in reverse series connection.
Still further, the current transducer comprises:
the U-phase circuit is respectively connected with the current limiting device, the bidirectional switch, the direct-current end of the power supply and the current detection unit or the first voltage detection unit or the second voltage detection unit;
the V-phase circuit is respectively connected with the current limiting device, the bidirectional switch, the direct-current end of the power supply and the current detection unit or the first voltage detection unit or the second voltage detection unit;
and the W-phase circuit is respectively connected with the current limiting device, the bidirectional switch, the direct-current end of the power supply and the current detection unit or the first voltage detection unit or the second voltage detection unit.
Furthermore, the U-phase circuit includes a first switch tube, a first diode connected in parallel with the first switch tube in the reverse direction, a second switch tube, and a second diode connected in parallel with the second switch tube in the reverse direction, a first end of the first switch tube is connected with the current limiting device, the bidirectional switch, and the current detecting unit or the first voltage detecting unit or the second voltage detecting unit, a second end of the first switch tube is connected with the power grid end and a first end of the second switch tube, and a second end of the second switch tube is connected with a negative pole of the direct current end of the power supply.
Furthermore, the V-phase circuit includes a third switch tube, a third diode connected in parallel with the third switch tube in the reverse direction, a fourth switch tube, and a fourth diode connected in parallel with the fourth switch tube in the reverse direction, a first end of the third switch tube is connected with the current limiting device, the bidirectional switch, and the current detecting unit or the first voltage detecting unit or the second voltage detecting unit, a second end of the third switch tube is connected with the power grid end and a first end of the fourth switch tube, and a second end of the fourth switch tube is connected with a second end of the second switch tube and a negative pole of the power direct current end.
Furthermore, the W-phase circuit includes a fifth switch tube, a fifth diode connected in reverse parallel with the fifth switch tube, a sixth switch tube, and a sixth diode connected in reverse parallel with the sixth switch tube, a first end of the fifth switch tube is connected with the current limiting device, the bidirectional switch, and the current detecting unit or the first voltage detecting unit or the second voltage detecting unit, a second end of the fifth switch tube is connected with the power grid end and a first end of the sixth switch tube, and a second end of the sixth switch tube is connected with a second end of the fourth switch tube, a second end of the second switch tube, and a negative pole of the direct current end of the power supply.
Still further, the energy storage converter for restraining the energy of the power grid from flowing backwards further comprises: and the alternating current filter is respectively connected with the current converter and the power grid end.
The utility model discloses the beneficial effect who reaches: on the basis of the original circuit and the related topology, a current limiting device, a bidirectional switch and a corresponding control circuit are added at the direct current end of the power supply. When the energy storage inverter works normally, two ends of the current limiting device are short-circuited by the bidirectional switch, and the current for normal charging and discharging only flows through the bidirectional switch because the conduction impedance of the bidirectional switch is far lower than that of the current limiting device. When any value of the direct current detected by the current detection unit in the control circuit, the direct voltage detected by the first voltage detection unit in the control circuit or the power grid voltage detected by the second voltage detection unit in the control circuit is larger than a preset value, the control unit can quickly control the driving unit to drive the bidirectional switch to be switched off and the current limiting device to be put into use, so that the current limiting device can inhibit the direct current. When the direct current, the direct voltage and the power grid voltage recover normal values, the control unit controls the driving unit to drive the two-way switch to be closed, the current limiting device is cut off, and the energy storage converter is switched to a normal working mode. The backflow current of the power grid end can be effectively restrained through the cooperation of the current limiting device, the two-way switch and the control circuit, the damage of internal devices of the energy storage converter and the energy storage battery is avoided, the fault enlargement caused by the damage is avoided, meanwhile, the defects brought by practical fuses or fuses are avoided, and the effect of protecting the energy storage converter is further realized. Therefore, the safety of the energy storage converter can be improved, and the hardware cost of the energy storage converter can be reduced.
Drawings
Fig. 1 is a schematic circuit diagram of an energy storage converter provided in the prior art;
fig. 2 is a schematic circuit diagram of another energy storage converter provided by the prior art;
fig. 3 is a schematic structural diagram of an energy storage converter for suppressing backward flow of power grid energy according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of several structures provided by the electronic switch in the embodiment of the present invention;
fig. 6 is a schematic circuit structure diagram of an energy storage converter for suppressing backward flow of power grid energy according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model discloses an on original circuit and relevant topological basis, increase current limiting device, two way switch and the control circuit who corresponds at power direct current end. When the energy storage inverter works normally, two ends of the current limiting device are short-circuited by the bidirectional switch, and the current for normal charging and discharging only flows through the bidirectional switch because the conduction impedance of the bidirectional switch is far lower than that of the current limiting device. When any value of the direct current detected by the current detection unit in the control circuit, the direct voltage detected by the first voltage detection unit in the control circuit or the power grid voltage detected by the second voltage detection unit in the control circuit is larger than a preset value, the control unit can quickly control the driving unit to drive the bidirectional switch to be switched off and the current limiting device to be put into use, so that the current limiting device can inhibit the direct current. When the direct current, the direct voltage and the power grid voltage recover normal values, the control unit controls the driving unit to drive the two-way switch to be closed, the current limiting device is cut off, and the energy storage converter is switched to a normal working mode. The backflow current of the power grid end can be effectively restrained through the cooperation of the current limiting device, the two-way switch and the control circuit, the damage of internal devices of the energy storage converter and the energy storage battery is avoided, the fault enlargement caused by the damage is avoided, meanwhile, the defects brought by practical fuses or fuses are avoided, and the effect of protecting the energy storage converter is further realized. Therefore, the safety of the energy storage converter can be improved, and the hardware cost of the energy storage converter can be reduced.
Example one
As shown in fig. 3, fig. 3 is a schematic structural diagram of an energy storage converter for suppressing backward flow of power grid energy according to an embodiment of the present invention; the energy storage converter for inhibiting the energy backflow of the power grid comprises a current converter 5 connected with a power grid end 7; the current limiting device 4 is connected between a positive electrode BAT + of a direct current end of a power supply and the current converter 5; a bidirectional switch 2 connected in parallel with the current limiting device 4; and a control circuit 3 connected to the current limiting device 4, the bidirectional switch 2, and the current transformer 5 or the grid terminal 7, respectively; as shown in fig. 4, the control circuit 3 includes a control unit 8, a current detection unit 9 or a first voltage detection unit 10 or a second voltage detection unit 11 connected to the control unit 8, and a drive unit 12 connected to the control unit 8 and the bidirectional switch 2, respectively; the current detection unit 9 is further connected with the power direct current end 1, the first voltage detection unit 10 is respectively connected with the current converter 5 and the bidirectional switch 2, and the second voltage detection unit 11 is respectively connected with the current converter 5 and the power grid end 7.
In particular, the grid terminal 7 is directly connected to the grid or directly connected to the grid load. The current of the grid side 7 is an alternating current, in which case the grid side 7 may also be referred to as an alternating current side.
The current converter 5 is used for a device for current conversion, such as a DC/AC converter or an AC/DC converter. Of course, the direction of connection of the current transformers 5 may be dependent on the specific type of current transformers 5.
The power supply direct current end 1 is connected with an energy storage battery, wherein the power supply direct current end 1 comprises a power supply direct current end anode BAT + and a power supply direct current end cathode BAT-. The current of the direct current end 1 of the power supply is direct current.
The current limiting device 4 is used for inhibiting the direct current of the direct current end 1 of the power supply, can effectively inhibit the backward flow current of the power grid end 7, and avoids the damage of the energy storage battery connected with the direct current end 1 of the power supply and the internal devices of the energy storage converter, which leads to the fault amplification.
Alternatively, the current limiting device 4 may be of the type of a current limiting resistor or a current limiting inductor. Of course, the current limiting device 4 may also be another device or topology capable of limiting the current.
The bidirectional switch 2 is used for short-circuiting the current limiting device 4. In normal operation, the bidirectional switch 2 is closed and operated, and the current limiting device 4 is short-circuited and not operated. When the power supply works abnormally, the bidirectional switch 2 is switched off, the current limiting device 4 is switched on to work normally at the moment, and the power supply direct-current end 1 and the current inverter are connected to limit the current of the power supply direct-current end 1.
Alternatively, the bidirectional switch 2 may be an electronic switch or a mechanical switch. An electronic switch may be used where real-time protection is required. And mechanical switches and the like can be adopted in occasions with low real-time requirements. The mechanical switch includes a relay, or a contactor or a breaker. As shown in fig. 5, the electronic switch may be a) in fig. 5 an Insulated Gate Bipolar Transistor (IGBT) connected in series in reverse; or B) in FIG. 5, reverse-parallel reverse-blocking type insulated gate bipolar transistors; or C in fig. 5) Metal-Oxide-Semiconductor Field-Effect transistors (mosfets) in reverse series.
It should be understood that the current limiting device 4 and the bidirectional switch 2 can be installed not only on the dc side 1 of the power supply, but also at any position in the path through which the backward current flows at the grid side 7. The utility model discloses a protection scope is all as long as the method of controlling the switching of bidirectional switch 2 and current limiting device 4 through current or voltage in the detection return circuit.
In an embodiment of the present invention, the energy storage converter further includes a capacitor C1, one end of the capacitor C1 is disposed on the connection line between the current transformer 5 and the bidirectional switch 2 and the current limiting device 4, and the other end of the capacitor C1 is connected to the connection line between the current transformer 5 and the dc terminal negative electrode BAT-.
The current detection unit 9 is configured to detect a current flowing through the dc terminal 1 of the power supply and transmit the detected current to the control unit 8.
The first voltage detection unit 10 is configured to detect a voltage at the dc terminal 1 of the power supply, and transmit the detected voltage to the control unit 8.
The second voltage detection unit 11 is configured to detect a voltage level of the power grid terminal 7, and transmit the detected voltage level to the control unit 8.
The control unit 8 is configured to receive the current transmitted by the current detection unit 9 and the voltages detected by the first voltage detection unit 10 and the second voltage detection unit 11. The received current and voltage are processed and compared with preset values, so that whether the current of the direct current end 1 of the power supply, the voltage of the direct current end 1 of the power supply and the voltage of the power grid end 7 are abnormal or not can be judged through the control unit 8. The preset value comprises a preset current value, a first preset voltage value and a second preset voltage value. When the control unit 8 determines that the current of the dc terminal 1 is greater than the preset current value, determines that the voltage of the dc terminal 1 is greater than the first preset voltage value, and determines that the voltage of the grid terminal 7 is greater than the second preset voltage value, it indicates that the current of the dc terminal 1 is abnormal, the voltage of the dc terminal 1 is abnormal, and the voltage of the grid terminal 7 is abnormal, otherwise, the current is normal. The control unit 8 controls the driving unit 12 to drive the bidirectional switch 2 to work according to the judgment condition of any one of the current of the power supply direct-current end 1, the voltage of the power supply direct-current end 1 or the voltage of the power grid end 7.
It should be noted that the current at the dc terminal 1 of the power supply may be referred to as dc current, the voltage at the dc terminal 1 of the power supply may be referred to as dc voltage, and the voltage at the grid terminal 7 may be referred to as grid voltage.
Specifically, on the basis of an original circuit and a related topology, a current limiting device 4, a bidirectional switch 2 and a corresponding control circuit 3 are added to a power supply direct current end 1. When the energy storage inverter works normally, two ends of the current limiting device 4 are short-circuited by the bidirectional switch 2, and as the on-resistance of the bidirectional switch 2 is far lower than that of the current limiting device 4, the current for normal charging and discharging only flows through the bidirectional switch 2. When any value of the direct current detected by the current detection unit 9 in the control circuit 3, the direct voltage detected by the first voltage detection unit 10 in the control circuit 3, or the grid voltage detected by the second voltage detection unit 11 in the control circuit 3 is larger than a preset value, the control unit 8 can quickly control the driving unit 12 to drive the bidirectional switch 2 to be switched off and the current limiting device 4 to be switched on, so that the current limiting device 4 can inhibit the direct current. When the direct current, the direct voltage and the power grid voltage recover normal values, the control unit 8 controls the driving unit 12 to drive the bidirectional switch 2 to be closed, the current limiting device 4 is cut off, and the energy storage converter is switched to a normal working mode.
The embodiment of the utility model provides an in, can restrain the backward flow electric current of electric wire netting end 7 very effectively through current limiting device 4, two-way switch 2, and control circuit 3's cooperation, avoid energy storage converter and energy storage battery inner member to damage, and the fault amplification who leads to, simultaneously, avoid the drawback that practical fuse or fuse brought, and then realize the effect of protection energy storage converter. Therefore, the safety of the energy storage converter can be improved, and the hardware cost of the energy storage converter can be reduced.
Example two
As shown in fig. 6, the current transformer 5 includes: and the U-phase circuit is respectively connected with the current limiting device 4, the bidirectional switch 2, the power direct-current end 1, the current detection unit 9 or the first voltage detection unit 10 or the second voltage detection unit 11 and the power grid end 7. And the V-phase circuit is respectively connected with the current limiting device 4, the bidirectional switch 2, the power direct-current end 1, the current detection unit 9 or the first voltage detection unit 10 or the second voltage detection unit 11 and the power grid end 7. And the W-phase circuit is respectively connected with the current limiting device 4, the bidirectional switch 2, the power direct-current end 1, the current detection unit 9 or the first voltage detection unit 10 or the second voltage detection unit 11, and the power grid end 7.
The grid terminal 7 includes a U port connected to the U-phase circuit, a V port connected to the V-phase circuit, and a W port connected to the W-phase circuit.
In an embodiment of the present invention, the U-phase circuit includes a first switch tube Q1, a first diode connected in parallel reversely to the first switch tube Q1, a second switch tube Q2, and a second diode connected in parallel reversely to the second switch tube Q2, the first end of the first switch tube Q1 is connected to the current limiting device 4, the bidirectional switch 2, and the current detecting unit 9 or the first voltage detecting unit 10 or the second voltage detecting unit 11, the second end of the first switch tube Q1 is connected to the grid terminal 7 and the first end of the second switch tube Q2, and the second end of the second switch tube Q2 is connected to the dc terminal negative BAT —.
The first switch tube Q1 and the second switch tube Q2 may be a first MOS tube and a second MOS tube, respectively; at this time, the first end of the first switch Q1 and the first end of the second switch Q2 may be referred to as a drain (D pole) of the first MOS transistor and a drain (D pole) of the second MOS transistor. The second end of the first switch Q1 and the second end of the second switch Q2 may refer to a source (S pole) of the first MOS transistor and a source (S pole) of the second MOS transistor.
Of course, the first switch Q1 and the second switch Q2 may also be a first transistor and a second transistor, respectively. At this time, the first end of the first switch Q1 and the first end of the second switch Q2 may be a collector (C-pole) of the first transistor and a collector (C-pole) of the second transistor. The second end of the first switch Q1 and the second end of the second switch Q2 may refer to an emitter (E pole) of the first transistor and an emitter (E pole) of the second transistor.
In an embodiment of the present invention, the V-phase circuit includes a third switch tube Q3, a third diode connected in parallel to the third switch tube Q3, a fourth switch tube Q4, and a fourth diode connected in parallel to the fourth switch tube Q4, the first end of the third switch tube Q3 is connected to the current limiting device 4, the bidirectional switch 2, and the current detecting unit 9 or the first voltage detecting unit 10 or the second voltage detecting unit 11, the second end of the third switch tube Q3 is connected to the power grid terminal 7 and the first end of the fourth switch tube Q4, and the second end of the fourth switch tube Q4 is connected to the second end of the second switch tube Q2 and the negative terminal BAT-.
The third switching tube Q3 and the fourth switching tube Q4 may be a third MOS tube and a fourth MOS tube, respectively; at this time, the first end of the third transistor Q3 and the first end of the fourth transistor Q4 may be a drain (D pole) of the third MOS transistor and a drain (D pole) of the fourth MOS transistor. The second end of the third transistor Q3 and the second end of the fourth transistor Q4 may refer to a source (S pole) of the third MOS transistor and a source (S pole) of the fourth MOS transistor.
Of course, the third switching tube Q3 and the fourth switching tube Q4 may also be a third transistor and a fourth transistor, respectively. At this time, the first terminal of the third transistor Q3 and the first terminal of the fourth transistor Q4 may be a collector (C-pole) of the third transistor and a collector (C-pole) of the fourth transistor. The second end of the third switching tube Q3 and the second end of the fourth switching tube Q4 may refer to an emitter (E pole) of the third transistor and an emitter (E pole) of the fourth transistor.
In an embodiment of the present invention, the W-phase circuit includes a fifth switch tube Q5, a fifth diode connected in reverse parallel with the fifth switch tube Q5, a sixth switch tube Q6, and a sixth diode connected in reverse parallel with the sixth switch tube Q6, the first end of the fifth switch tube Q5 is connected to the current limiting device 4, the bidirectional switch 2, and the current detection unit 9 or the first voltage detection unit 10 or the second voltage detection unit 11, the second end of the fifth switch tube Q5 is connected to the grid terminal 7 and the first end of the sixth switch tube Q6, and the second end of the sixth switch tube Q6 is connected to the second end of the fourth switch tube Q4, the second end of the second switch tube Q2, and the negative BAT-terminal of the power supply direct current terminal.
The fifth switching tube Q5 and the sixth switching tube Q6 may be a fifth MOS tube and a sixth MOS tube, respectively; at this time, the first end of the fifth switch Q5 and the first end of the sixth switch Q6 may be referred to as a drain (D pole) of the fifth MOS transistor and a drain (D pole) of the sixth MOS transistor. The second end of the fifth switch Q5 and the second end of the sixth switch Q6 may be referred to as the source (S pole) of the fifth MOS transistor and the source (S pole) of the sixth MOS transistor.
Of course, the fifth switch Q5 and the sixth switch Q6 may also be a fifth transistor and a sixth transistor, respectively. At this time, the first end of the fifth switch Q5 and the first end of the sixth switch Q6 may be a collector (C-pole) of the fifth triode and a collector (C-pole) of the sixth triode. The second end of the fifth switch Q5 and the second end of the sixth switch Q6 may refer to an emitter (E pole) of the fifth transistor and an emitter (E pole) of the sixth transistor.
In the embodiment of the utility model provides an in, convert DC power supply through U looks circuit, V looks circuit and the W looks circuit among the current transformer 5 to output three-phase alternating current and give electric wire netting end 7, and then make electric wire netting end 7 provide the electric wire netting or the load of being connected with it. Therefore, on the basis that the current limiting device 4, the bidirectional switch 2 and the control circuit 3 are matched, stable alternating current can be provided for the power grid end 7, in the process of converting direct current into alternating current, the backward flowing current of the power grid end 7 is effectively inhibited, and the damage of an energy storage converter and an energy storage battery internal device and the fault amplification caused by the damage are avoided. And the safety of the energy storage converter can be improved, and the hardware cost of the energy storage converter can be reduced.
EXAMPLE III
Referring to fig. 6, the energy storage converter for suppressing the backward flow of the grid energy further includes: and an alternating current filter 6 connected to the current converter 5 and the grid terminal 7, respectively.
Wherein, ac filter 6 includes: the filter circuit comprises a first filter inductor L1, a first filter capacitor C2, a second filter inductor L2, a second filter capacitor C3, a third filter inductor L3 and a third filter capacitor C4.
Specifically, one end of a first filter inductor L1 is connected to a connection line between the second end of the first switch tube Q1 and the first end of the second switch tube Q2, the other end of the first filter inductor L1 is connected to the U port of the grid end 7 and one end of a first filter capacitor C2, and the other end of the first filter capacitor C2 is connected to one end of a second filter capacitor C3 and one end of a third capacitor. The other end of the second capacitor is connected to the V port of the grid terminal 7 and one end of the second filter inductor L2, and the other end of the second filter inductor L2 is connected to the second end of the second switch transistor Q2 and the first end of the third switch transistor Q3. The other end of the third filter capacitor C4 is connected to the W port of the grid terminal 7 and one end of the third filter inductor L3, respectively, and the other end of the third filter inductor L3 is connected to the second end of the fifth switch tube Q5 and the first end of the sixth switch tube Q6, respectively.
The embodiment of the utility model provides an in, be provided with alternating current filter 6 between current transformer 5 and electric wire netting end 7, the alternating current to electric wire netting end 7 that can be fine carries out the filtering, and then provides a stable alternating current for electric wire netting or the load of electric wire netting end 7. And the output stability of the energy storage converter is further improved.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An energy storage converter for suppressing energy backflow in a power grid, comprising:
the current converter is connected with the power grid end;
the current limiting device is connected between the positive electrode of the direct current end of the power supply and the current converter;
a bidirectional switch connected in parallel with the current limiting device;
and a control circuit respectively connected with the current limiting device, the bidirectional switch and the current converter or the power grid end;
the control circuit comprises a control unit, a current detection unit or a first voltage detection unit or a second voltage detection unit connected with the control unit, and a driving unit respectively connected with the control unit and the bidirectional switch;
the current detection unit is further connected with the direct current end of the power supply, the first voltage detection unit is respectively connected with the current converter and the bidirectional switch, and the second voltage detection unit is respectively connected with the current converter and the power grid end.
2. An energy storage converter for suppressing mains energy back-flow as claimed in claim 1, wherein said current limiting means comprises a current limiting resistor or a current limiting inductor.
3. An energy storage converter for suppressing grid energy back-flow as claimed in claim 1, wherein said bi-directional switch comprises an electronic switch or a mechanical switch.
4. An energy storage converter for suppressing mains energy back-flow as claimed in claim 3, wherein said mechanical switch comprises a relay, or a contactor or a circuit breaker.
5. An energy storage converter for suppressing energy backflow in a power grid according to claim 3, wherein said electronic switch comprises an inverse series insulated gate bipolar transistor, or an inverse parallel reverse blocking insulated gate bipolar transistor, or an inverse series metal-oxide semiconductor field effect transistor.
6. An energy storage converter for suppressing grid energy back-flow as claimed in claim 1, wherein said current converter comprises:
the U-phase circuit is respectively connected with the current limiting device, the bidirectional switch, the direct-current end of the power supply and the current detection unit or the first voltage detection unit or the second voltage detection unit;
the V-phase circuit is respectively connected with the current limiting device, the bidirectional switch, the direct-current end of the power supply and the current detection unit or the first voltage detection unit or the second voltage detection unit;
and the W-phase circuit is respectively connected with the current limiting device, the bidirectional switch, the direct-current end of the power supply and the current detection unit or the first voltage detection unit or the second voltage detection unit.
7. An energy storage converter for suppressing grid energy back-flow as claimed in claim 6,
the U-phase circuit comprises a first switch tube, a first diode, a second switch tube and a second diode, wherein the first diode and the second diode are connected with the first switch tube in a reverse parallel mode, the second diode and the second switch tube in a reverse parallel mode, the first end of the first switch tube is connected with the current limiting device, the two-way switch and the current detection unit or the first voltage detection unit or the second voltage detection unit respectively, the second end of the first switch tube is connected with the power grid end and the first end of the second switch tube respectively, and the second end of the second switch tube is connected with the negative electrode of the direct current end of the power supply respectively.
8. An energy storage converter for suppressing grid energy back-flow as claimed in claim 7,
the V-phase circuit comprises a third switch tube, a third diode, a fourth switch tube and a fourth diode, wherein the third diode and the fourth switch tube are connected in parallel in a reverse direction, the first end of the third switch tube is connected with the current limiting device, the bidirectional switch and the current detection unit or the first voltage detection unit or the second voltage detection unit respectively, the second end of the third switch tube is connected with the power grid end and the first end of the fourth switch tube respectively, and the second end of the fourth switch tube is connected with the second end of the second switch tube and the negative pole of the direct current end of the power supply respectively.
9. An energy storage converter for suppressing grid energy back-flow as claimed in claim 8,
the W-phase circuit comprises a fifth switch tube, a fifth diode and a sixth switch tube which are connected with the fifth switch tube in a reverse parallel mode, and a sixth diode which is connected with the sixth switch tube in a reverse parallel mode, the first end of the fifth switch tube is respectively connected with the current limiting device, the two-way switch and the current detection unit or the first voltage detection unit or the second voltage detection unit, the second end of the fifth switch tube is respectively connected with the power grid end and the first end of the sixth switch tube, and the second end of the sixth switch tube is respectively connected with the second end of the fourth switch tube, the second end of the second switch tube and the negative pole of the direct current end of the power supply.
10. An energy storage converter for suppressing grid energy backflow as claimed in any one of claims 1 to 9, further comprising: and the alternating current filter is respectively connected with the current converter and the power grid end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021688275.6U CN213547389U (en) | 2020-08-13 | 2020-08-13 | Energy storage converter for restraining backward flow of power grid energy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021688275.6U CN213547389U (en) | 2020-08-13 | 2020-08-13 | Energy storage converter for restraining backward flow of power grid energy |
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| CN213547389U true CN213547389U (en) | 2021-06-25 |
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| CN202021688275.6U Active CN213547389U (en) | 2020-08-13 | 2020-08-13 | Energy storage converter for restraining backward flow of power grid energy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024188150A1 (en) * | 2023-03-16 | 2024-09-19 | 华为数字能源技术有限公司 | Energy storage system and energy storage management system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024188150A1 (en) * | 2023-03-16 | 2024-09-19 | 华为数字能源技术有限公司 | Energy storage system and energy storage management system |
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