CN217882862U - Three-phase chain battery energy storage voltage source converter - Google Patents
Three-phase chain battery energy storage voltage source converter Download PDFInfo
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- CN217882862U CN217882862U CN202220057781.8U CN202220057781U CN217882862U CN 217882862 U CN217882862 U CN 217882862U CN 202220057781 U CN202220057781 U CN 202220057781U CN 217882862 U CN217882862 U CN 217882862U
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Abstract
The utility model belongs to the technical field of electrical automation equipment, particularly, relate to a three-phase chain battery energy storage voltage source converter. The three-phase alternating current power supply comprises 3N single-phase voltage source energy storage power modules, three connecting reactors, three alternating current limiting resistors and three bypass switches; the alternating current output ends of the N single-phase voltage source energy storage power modules are connected in series and then connected with a connecting reactor and an alternating current limiting resistor in series to form a phase-change current circuit, one ends of the three-phase current-change circuits are connected with each other to form star connection, the other ends of the three-phase current-change circuits serve as three-phase alternating current output ends A, B and C of the three-phase chained voltage source energy storage converter, and the three bypass switches are connected in parallel to two ends of the three alternating current limiting resistors respectively. The utility model discloses three-phase chain battery energy storage voltage source converter is with low costs than existing transformer type battery energy storage voltage source converter that steps up, and the loss is low, has guaranteed energy storage battery's safe operation moreover.
Description
Technical Field
The utility model belongs to the technical field of electrical automation equipment, particularly, relate to a three-phase chain battery energy storage voltage source converter.
Background
A battery energy storage voltage source converter (hereinafter referred to as PCS) generally adopts a voltage source converter with low alternating voltage (generally less than 800 VAC) output to be connected to a medium-voltage power grid through a transformer boosting mode. When the mode realizes the application of high-capacity energy storage, extra cost and loss are brought by connecting the transformer, and the mode is not suitable for the application of high-capacity battery energy storage.
The chained voltage source converter is often applied to high-voltage frequency converters and medium-voltage SVG products, and is characterized by omitting a transformer, being low in cost and low in loss, so that the chained voltage source converter is suitable for energy storage of high-capacity batteries, and the energy storage batteries are respectively connected to the direct current sides of power modules of the chained voltage source converter. However, simple access causes the current flowing to the battery to contain a relatively large ac component, which is disadvantageous to the safe operation of the battery. There is therefore a need to address the filtering of battery current.
Disclosure of Invention
The utility model aims at providing a three-phase chain battery energy storage voltage source converter to overcome prior art not enough, solve the filtering problem of battery alternating current component electric current when chain voltage source converter is applied to the battery energy storage.
The embodiment of the utility model provides a three-phase chain battery energy storage voltage source converter, including 3N single-phase voltage source energy storage power module, three connecting reactor, three interchange current-limiting resistance and three bypass switch; the alternating current output ends of N single-phase voltage source energy storage power modules in the 3N single-phase voltage source energy storage power modules are connected in series and then connected in series with a connecting reactor and a current limiting resistor to form a three-phase current transformation circuit, one ends of the three-phase current transformation circuit are connected with each other to form star connection, and the other ends of the three-phase current transformation circuit are used as three-phase alternating current output ends A, B and C of the three-phase chain type battery energy storage voltage source converter; the three bypass switches are respectively connected in parallel at two ends of the three alternating current limiting resistors.
In the three-phase chain type battery energy storage voltage source converter, the single-phase voltage source energy storage power module comprises a single-phase voltage source full-bridge inverter bridge, a direct current filter capacitor, an LC series filter circuit, a filter reactor, a fuse, a direct current limiting resistor, a bypass contactor, a protection direct current contactor, a bipolar switch and a group of energy storage batteries; two alternating current output ends O1/O2 of the single-phase voltage source full-bridge inverter bridge are respectively used as alternating current output ends of the single-phase voltage source energy storage power module, the direct current positive and negative poles of the single-phase voltage source full-bridge inverter bridge are respectively connected to the positive and negative poles of the direct current filter capacitor, the LC series filter circuit is connected in parallel at the two ends of the direct current filter capacitor, the positive pole of the direct current filter capacitor is connected to one end of the filter reactor, the negative pole of the direct current filter capacitor is connected to one end of the breaker, the other end of the filter reactor is connected to one end of the main contact of the bypass contactor, the other end of the main contact of the bypass contactor is connected to one end of the main contact of the protection direct current contactor, the other end of the main contact of the protection direct current contactor and the other end of the fuse are respectively connected to the positive output end and the negative output end of the bipolar switch, the positive input end and the negative input end of the bipolar switch are respectively connected to the positive pole and the negative pole of the energy storage battery, and the direct current limiting resistor is connected in parallel at the two ends of the main contact of the bypass contactor.
The utility model provides a three-phase chain battery energy storage voltage source converter, its advantage:
compare with existing transformer type battery energy storage voltage source converter that steps up, the utility model discloses a three-phase chain battery energy storage voltage source converter is with low costs, and the loss is low, has solved the filtering problem of battery alternating current component when chain voltage source converter inserts the battery simultaneously, has guaranteed energy storage battery's safe operation.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is clear that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is the utility model provides a three-phase chain battery energy storage voltage source converter's circuit schematic diagram.
Fig. 2 is a schematic circuit diagram of a single-phase voltage source energy storage power module in the three-phase chained battery energy storage voltage source converter of the present invention.
In fig. 1-2, 1 is a bypass switch, 2 is an ac current limiting resistor, 3 is a connecting reactor, 4 is a three-phase current converting circuit, 5 is a single-phase voltage source full-bridge inverter bridge, 6 is a dc filter capacitor, 7 is an LC series filter circuit inductor, 8 is an LC series filter circuit capacitor, 9 is a filter reactor, 10 is a fuse, 11 is a bypass contactor, 12 is a dc current limiting resistor, 13 is a protection dc contactor, 14 is a bipolar switch, and 15 is an energy storage battery.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, the embodiments being described by way of example with reference to the accompanying drawings, which are intended to illustrate the invention and are not to be construed as limiting the invention.
The embodiment of the utility model provides a three-phase chain battery energy storage voltage source converter, its schematic circuit diagram is shown in fig. 1, including 3N single-phase voltage source energy storage power module 4 (PA 1-PAN/PB1-PBN PC 1-PCN), three connecting reactor 3 (LA/LB/LC), three interchange current limiting resistance 2 (RA/RB/RC) and three bypass switch 1 (KA/KB/KC); the alternating current output ends of N single-phase voltage source energy storage power modules in the 3N single-phase voltage source energy storage power modules are connected in series and then connected in series with a connecting reactor 3 and a current limiting resistor 2 to form a three-phase current transformation circuit, one ends of the three-phase current transformation circuit are connected with each other to form star connection, and the other ends of the three-phase current transformation circuit are used as three-phase alternating current output ends A, B and C of the three-phase chain type battery energy storage voltage source converter; three bypass switches 1 (KA/KB/KC) are respectively connected in parallel with two ends of three alternating current limiting resistors 2 (RA/RB/RC).
The circuit schematic diagram of the single-phase voltage source energy storage power module in the three-phase chain type battery energy storage voltage source converter is shown in fig. 2, and the single-phase voltage source energy storage power module comprises a single-phase voltage source full-bridge inverter bridge 5 (INV), a direct current filter capacitor 6 (C0), LC series filter circuits 7 and 8 (L1/C1), a filter reactor 9 (L2), a fuse 10 (FD), a direct current limiting resistor 12 (RS), a bypass contactor 11 (J1), a protection direct current contactor 13 (J2), a bipolar switch 14 (KD) and a group of energy storage batteries 15 (B); two alternating current output ends O1/O2 of single-phase voltage source full-bridge inverter bridge 5 (INV) are respectively as the alternating current output end of single-phase voltage source energy storage power module, and the direct current positive and negative poles of single-phase voltage source full-bridge inverter bridge 5 (INV) are connected to respectively the positive and negative poles of direct current filter capacitor 6 (C0), LC series filter circuit 7 and 8 (L1/C1) are parallelly connected at direct current filter capacitor 6 (C0) both ends, the positive pole of direct current filter capacitor 6 (C0) is connected to the one end of filter reactor 9 (L2), the negative pole of direct current filter capacitor 6 (C0) is connected to the one end of interrupter 10 (FD), the other end of filter reactor 9 (L2) is connected to the one end of bypass contactor 11 (J1) main contact, the other end of bypass contactor 11 (J1) main contact be connected to the one end of the main contact of protection direct current contactor 13 (J2), the other end of the main contact of protection direct current contactor 13 (J2) and the other end of fuse 10 (FD) are connected to the positive input end of positive switch 14 and the negative switch 14 of double-pole current limiting contactor RS 12, the negative switch 14 and the positive switch 14 are connected to the two parallel connection of bypass current output ends of double-limiting contactor RS 12.
The embodiment of the utility model provides a three-phase chain battery energy storage voltage source converter's theory of operation that:
after the three-phase chained battery energy storage voltage source converter is connected to a power grid, the 3N single-phase voltage source energy storage power module direct-current filter capacitors C0 are charged in a current-limiting mode through the three alternating-current-limiting resistors RA/RB/RC, and after charging is finished, the three bypass switches KA/KB/KC close and bypass the three alternating-current-limiting resistors RA/RB/RC. And then the main contact of the protection direct current contactor J2 in the power module is attracted, the energy storage battery charges (or discharges) the direct current filter capacitor C0 through the direct current limiting resistor RS, the main contact of the bypass contactor J1 is attracted after the charging or discharging of the direct current filter capacitor C0 is finished, and the bypass direct current limiting resistor RS is bypassed. And then the chained battery energy storage voltage source converter is controlled to enter an operating state, and the active power value and the reactive power value output to the power grid can be respectively set, so that the battery releases energy to the power grid (discharges) or absorbs energy from the power grid (charges), and the purpose of energy storage is achieved. The LC series filtering branch circuit L1/C1 of the single-phase voltage source energy storage power module completes filtering of frequency multiplication component current of power grid frequency 2, and the filter reactor L2 completes filtering of single-phase inverter bridge switching frequency alternating current component current, so that current flowing into the battery is guaranteed to meet the requirements of technical standards. The fuse FD is used for protecting the energy storage battery from being influenced by short-circuit current, and the protection direct current contactor J2 is used for automatically switching to the energy storage battery when the power module or the energy storage battery breaks down, so that the purpose of protecting the energy storage battery is achieved.
The utility model discloses the circuit also can increase other auxiliary circuit as the application after the deformation, and power module and connection reactor branch road in the three-phase chain voltage source energy storage converter also can adopt the triangle-shaped connection, and energy storage battery also can use other energy storage components (for example super capacitor), and any is based on the utility model discloses the equivalent transformation circuit that the circuit was done all belongs to the utility model discloses a protection scope.
Claims (2)
1. A three-phase chain type battery energy storage voltage source converter is characterized by comprising 3N single-phase voltage source energy storage power modules, three connecting reactors, three alternating current limiting resistors and three bypass switches; the alternating current output ends of N single-phase voltage source energy storage power modules in the 3N single-phase voltage source energy storage power modules are connected in series and then connected in series with a connecting reactor and a current limiting resistor to form a three-phase current transformation circuit, one ends of the three-phase current transformation circuit are connected with each other to form star connection, and the other ends of the three-phase current transformation circuit are used as three-phase alternating current output ends A, B and C of the three-phase chain type battery energy storage voltage source converter; the three bypass switches are respectively connected in parallel at two ends of the three alternating current limiting resistors.
2. The three-phase chain-link battery energy storage voltage source converter according to claim 1, wherein the single-phase voltage source energy storage power module comprises a single-phase voltage source full-bridge inverter bridge, a direct current filter capacitor, an LC series filter circuit, a filter reactor, a fuse, a direct current limiting resistor, a bypass contactor, a protection direct current contactor, a bipolar switch and a group of energy storage batteries; two alternating current output ends O1/O2 of the single-phase voltage source full-bridge inverter bridge are respectively used as alternating current output ends of the single-phase voltage source energy storage power module, the direct current positive and negative poles of the single-phase voltage source full-bridge inverter bridge are respectively connected to the positive and negative poles of the direct current filter capacitor, the LC series filter circuit is connected in parallel at the two ends of the direct current filter capacitor, the positive pole of the direct current filter capacitor is connected to one end of the filter reactor, the negative pole of the direct current filter capacitor is connected to one end of the breaker, the other end of the filter reactor is connected to one end of the main contact of the bypass contactor, the other end of the main contact of the bypass contactor is connected to one end of the main contact of the protection direct current contactor, the other end of the main contact of the protection direct current contactor and the other end of the fuse are respectively connected to the positive output end and the negative output end of the bipolar switch, the positive input end and the negative input end of the bipolar switch are respectively connected to the positive pole and the negative pole of the energy storage battery, and the direct current limiting resistor is connected in parallel at the two ends of the main contact of the bypass contactor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220057781.8U CN217882862U (en) | 2022-01-11 | 2022-01-11 | Three-phase chain battery energy storage voltage source converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220057781.8U CN217882862U (en) | 2022-01-11 | 2022-01-11 | Three-phase chain battery energy storage voltage source converter |
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| CN217882862U true CN217882862U (en) | 2022-11-22 |
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