CN112072680A - Energy storage converter - Google Patents
Energy storage converter Download PDFInfo
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- CN112072680A CN112072680A CN201910502297.4A CN201910502297A CN112072680A CN 112072680 A CN112072680 A CN 112072680A CN 201910502297 A CN201910502297 A CN 201910502297A CN 112072680 A CN112072680 A CN 112072680A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to an energy storage converter, which comprises a battery unit, a battery side DC/DC module, a common direct current bus and a three-phase DC/AC current conversion chain which are connected in sequence; one end of each battery side DC/DC module is connected with the corresponding battery unit, and the other end of each battery side DC/DC module is connected with the common direct current bus after being connected in parallel; the direct current side of each phase of DC/AC converter chain is connected in parallel to the public direct current bus, and the alternating current side forms a star-shaped or triangular connection mode to be connected with a power grid. When some battery units have faults, the energy storage converter of the invention spreads the voltage reduction caused by the faulty battery units on each phase so as to maintain the balance of the output of each phase and ensure the stability, high efficiency and reliability of the system.
Description
Technical Field
The invention belongs to the technical field of power electronic conversion, and particularly relates to an energy storage converter.
Background
At present, the capacity of an energy storage power station is mostly from several megawatts to tens of megawatts, the existing three-level energy storage converter topology is difficult to meet the requirement on the capacity, and multiple groups of three-level energy storage converters are generally connected in parallel through a step-up transformer and then are connected into a power grid through a primary transformer or directly connected into the power grid, so that the high-capacity energy storage power station is formed. Such structures exist in many ways: the method has the advantages of low power consumption, high power grid output harmonic content, high power grid fluctuation instability, high total station cost and the like due to the fact that multiple machines run in parallel, high harmonic risk, high instability of power grid fluctuation, high output harmonic content of a power station, difficulty in achieving station-level quick response, investment in transformers, SVG (scalable vector graphics), local monitoring devices and the like are needed, and the like.
The energy storage converter adopting the chain topology can realize one machine, fundamentally solves the problems and has wide engineering application prospect.
The energy storage converter based on the chain topology generally adopts the following structure: the battery unit is directly connected with the H-Bridge unit or connected with the H-Bridge unit through a Dual-Active full-Bridge direct current converter (DAB) to be cascaded and connected with the grid. For example, the chinese utility model publication with the grant publication number CN207732448U discloses the former, in which the low-voltage side and the high-voltage side are not isolated, the battery is suspended at a high potential, and 2 times frequency current pulsation exists at the dc side, which is not favorable for the insulation design of the low-voltage side and affects the battery life; the latter uses an isolation structure but greatly reduces the converter efficiency. More importantly, the two batteries are directly connected to the DC/AC module by the battery unit, and the performance of the batteries is different, so that the output of each phase is unbalanced; in particular, batteries are prone to failure, and once a battery fails, the output of the failed phase changes, resulting in system instability.
Disclosure of Invention
The invention provides an energy storage converter, which is used for solving the problem that a system is easy to be unstable in the prior art.
In order to solve the technical problems, the technical scheme and the beneficial effects of the invention are as follows:
the invention relates to an energy storage converter which comprises a battery unit, a battery side DC/DC module, a common direct current bus and a three-phase DC/AC current conversion chain, wherein the battery unit, the battery side DC/DC module, the common direct current bus and the three-phase DC/AC current conversion chain are sequentially connected; one end of each battery side DC/DC module is connected with the corresponding battery unit, and the other end of each battery side DC/DC module is connected with the common direct current bus after being connected in parallel; the direct current side of each phase of DC/AC converter chain is connected in parallel to the public direct current bus, and the alternating current side forms a star-shaped or triangular connection mode to be connected with a power grid.
The beneficial effects are as follows: the energy storage converter is characterized in that a battery unit is connected with a corresponding battery side DC/DC module, the other end of each battery side DC/DC module is connected in parallel and then is converged into a common direct current bus, the direct current sides of three-phase DC/AC converter chains are connected in parallel on the common direct current bus, and the alternating current sides form a star-shaped or triangular connection mode to be connected with a power grid to realize energy exchange with the power grid. When some battery units have faults, the energy storage converter of the invention spreads the voltage reduction caused by the faulty battery units on each phase so as to maintain the balance of the output of each phase and ensure the stability, high efficiency and reliability of the system.
Furthermore, in order to realize large-capacity energy storage, each phase of DC/AC converter chain comprises a plurality of DC/AC modules, the direct current ends of the DC/AC modules on each phase of converter chain are connected in parallel, and the alternating current ends of the DC/AC modules on each phase of converter chain are cascaded.
Further, for reliable energy exchange with the grid, the DC/AC module is an isolated DC/AC module comprising a grid-side DC/DC unit and a DC/AC unit.
Further, in order to simply and reliably realize the current transformation function, the power grid side DC/DC unit is an isolated LLC resonance structure.
Further, for simple and reliable implementation of the current transformation function, the DC/AC unit is an H-bridge structure.
Furthermore, in order to prevent the damage of the failed DC/AC module to the system, both ends of each phase of DC/AC converter chain are provided with bypass circuits.
Furthermore, in order to prevent overvoltage and overcurrent at the moment of starting, soft start circuits are arranged on a line between the battery unit and the DC/DC converter at the battery side, a line between the public direct-current bus and the three-phase current conversion chain and a line between the three-phase current conversion chain and the power grid, the soft start circuits comprise a main switch, and a soft start resistor and a soft start switch which are connected in series are connected in parallel at two ends of the main switch.
Further, in order to connect the battery unit to the common direct current bus, the battery side DC/DC module is of a two-level or three-level structure.
Furthermore, in order to ensure reliable energy transmission, an LC filter circuit is arranged between one end of the battery side DC/DC module and the corresponding battery unit.
Drawings
Fig. 1 is a circuit diagram of a Y-connected energy storage converter of the present invention;
FIG. 2-1 is a circuit diagram of a battery-side DC/DC module of the present invention employing a three-level bidirectional Buck/Boost topology;
fig. 2-2 is a circuit diagram of a battery-side DC/DC module of the present invention employing a bidirectional four-switch Buck-Boost topology;
FIG. 3 is a circuit diagram of a grid-side DC/DC unit of the present invention employing an isolated LLC resonant structure;
FIG. 4 is a circuit diagram of a bypass circuit in the auxiliary circuit of the present invention;
fig. 5 is a circuit diagram of a storage converter of the present invention including a bypass circuit, a soft start circuit, and a measurement circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
The embodiment provides an energy storage converter, which comprises a battery unit, a battery side DC/DC module, a common direct current bus and a three-phase DC/AC converter chain, wherein the battery unit, the battery side DC/DC module, the common direct current bus and the three-phase DC/AC converter chain are sequentially connected.
The structure is as follows: one end of each battery side DC/DC module is connected with the corresponding battery unit, and the other end of each battery side DC/DC module is connected in parallel and then converged into the common direct current bus so as to maintain the voltage of the common direct current bus to be constant. The direct current side of each phase of DC/AC conversion chain is connected in parallel on a public direct current bus, and the alternating current side is connected with a power grid (a three-phase high-voltage direct current power grid) in a star (Y) or triangle (delta) connection mode to realize energy exchange with the power grid. Each phase of DC/AC converter chain comprises a corresponding phase of DC/AC converter, each phase of DC/AC converter (namely each power module) comprises a plurality of DC/AC modules, the direct current ends of the DC/AC modules on each phase of converter chain are connected in parallel, and the alternating current ends of the DC/AC modules on each phase of converter chain are cascaded. The DC/AC module is an isolated DC/AC module and consists of an LLC resonant converter and an H-bridge unit, wherein the LLC resonant converter realizes the electrical isolation of a low-voltage side and a high-voltage side and provides stable direct-current voltage for the H-bridge unit.
Common energy storage batteries, such as lithium batteries, lead-acid batteries and other electrochemical batteries can be selected for each battery unit. The voltage class of the power grid can be 6kV, 10kV and 35kV, and the number of the DC/AC modules is set according to the voltage class of the power grid. As shown in fig. 1, the energy storage converter is applied to a 10kV alternating current system, the design capacity is 2.5MW, a full-bridge two-level Y-type topology is adopted on the cascade side, the number of cascades n is 12, and the number of DC/AC modules is 3 × 12 in consideration of certain redundancy.
The battery side DC/DC module is a non-isolated DC/DC module, and the topological structure of the battery side DC/DC module is determined by the voltages of the battery unit and the common direct current bus. The working voltage range of the battery is Umin＜Ubattery＜UmaxWhen the maximum value of the working voltage of the battery is less than the voltage of the common direct current bus, namely Umax＜Udc-busAnd in the process, the battery side DC/DC module can adopt a two-level or three-level Buck/Boost circuit. The bridge is a full-bridge structure formed by connecting two-level Buck/Boost half-bridge arms in parallel, and each bridge arm is in an I-type three-level topology formed by four switching devices. When energy flows from the battery side to the public direct current bus side, the two topologies can be equivalent to Boost powerWhen energy flows from the side of the common direct current bus bar to the side of the battery, the circuit is equivalent to a Buck circuit, and the energy flows between the battery unit and the common direct current bus bar. As shown in fig. 2-1, the battery unit is connected to the input end of a three-level Buck/Boost circuit formed by switching devices T1-T8 through an LC filter circuit, and the output is connected to a common dc bus through a filter capacitor. The selection of the specification of a specific switching device is related to the design capacity, the rated current and the like. For example, the design capacity is 50kW, the rated current is 66A, 1.2 times of instantaneous overload and 1.2 times of overcurrent protection of the switching devices T1-T8 are considered, the maximum current of the switching devices T1-T8 is 85A, and IGBT modules with the voltage specification of 600V and the current specification of 90A are selected.
When the common DC bus voltage is between the maximum and minimum of the battery operating voltage, i.e. Umin＜Udc-bus＜UmaxMeanwhile, the DC/DC of the battery side can adopt a bidirectional Buck-Boost or a bidirectional Four-Switch Buck-Boost (FSBB) topology. The former is a reverse polarity conversion circuit formed by replacing a switching tube and a freewheeling diode in the traditional unidirectional Buck-Boost with a switching tube and an anti-parallel diode. The latter is formed by cascading the output side of a Buck topology and the input side of a Boost topology, removing an intermediate support capacitor and combining energy storage inductors. When energy flows bidirectionally between the battery side and the public direct current bus side through the two topologies, the converters based on the two topologies can be equivalent to Buck-Boost converters, and the Boost or Buck conversion can be realized during bidirectional flow. As shown in fig. 2-2, the bidirectional four-switch Buck-Boost circuit is characterized in that a battery side is connected to a bidirectional four-switch Buck-Boost converter formed by switching devices T1-T4 through a filter capacitor, and an output is connected to a common direct current bus through the filter capacitor.
As shown in fig. 3, the LLC resonant converter is an isolated DC/DC converter unit composed of switching devices and a high-frequency transformer, the primary and secondary sides of the converter unit are respectively connected in series to resonant inductors Lr1 and Lr2, resonant capacitors Cr1 and Cr2, the primary or secondary side is connected in parallel or equivalently connected in parallel to an excitation inductor Lm by winding leakage reactance, the three components together form a resonant circuit, the full-operating-range soft switching of each switching device is realized by frequency modulation control, and the switching loss is reduced while the isolation of the low-voltage side and the high-voltage side of the circuit is realized. The LLC resonant converter input U1 and output U2 are connected to a common DC bus and an H-bridge unit via support filter capacitors C1 and C2, respectively. The specification of each device is selected according to the design capacity, input voltage, output voltage and the like. For example, the designed capacity is 75kW, the input voltage is 750V, the output voltage is 1000V, the rated current of the low-voltage side is 100A, the peak current passing through the switching devices Q1 to Q4 of the LLC resonant converter is 141A, the peak current passing through the switching devices Q1 to Q4 is 240A in consideration of 1.2 times of instantaneous overload and 1.2 times of overcurrent protection of the power module, and the IGBT module with the voltage specification of 1200V and the current specification of 300A is selected. The rated current of the high-voltage side is 75A, the peak current passing through the switching devices Q1-Q4 is 106A, the instantaneous overload of the power module by 1.2 times and the overcurrent protection by 1.2 times are considered, the current peak value passing through the switching devices Q1-Q4 is 153A, and an IGBT module with the voltage specification of 1700V and the current specification of 225A is selected. The specific resonance parameters Lr1, Lr2, Lm and Cr1, Cr2 are determined by the switching frequency of the LLC resonant converter and the high-frequency transformer transformation ratio, and in the above example, Lr1 ═ Lr2 ═ 50mH, Lm ═ 300mH, and Cr1 ═ Cr2 ═ 80 uF.
As shown in fig. 1, the H-bridge unit may adopt a two-level topology, where the input end is connected in parallel with the previous stage LLC resonant converter in the same polarity, and the output is cascaded with the H-bridge modules in other DC/AC converters in the same phase. The rated current of the alternating current side is 144A, the peak current passing through the switching devices Q9-Q12 is 250A, 1.2 times of instantaneous overload and 1.2 times of overcurrent protection of the power module are considered, the peak current passing through the switching devices Q9-Q12 is 300A, and an IGBT module with the voltage specification of 1700V and the current specification of 300A is selected. In addition, an H-bridge unit of a three-level topology may also be employed.
The energy storage converter further comprises auxiliary circuits: the device comprises a filter circuit, a bypass circuit, a soft start circuit and a measuring circuit.
The filter circuit in the energy storage converter comprises: the DC/AC converter comprises an LC filter circuit arranged at one end of the battery side DC/DC module, a filter inductor and a filter capacitor arranged on a line between the common DC bus and the three-phase DC/AC converter chain, a filter capacitor arranged at the DC side of the H-bridge unit, a grid-connected reactor (not shown) after the H-bridge unit is cascaded, and the like. The filter circuits can select all or part of the filter circuits according to the actual structure of the energy storage converter, system parameters and current-voltage ripple requirements, and set appropriate filter parameters.
The bypass circuits are respectively connected to the alternating current side and the direct current side of the corresponding phase DC/AC converter, namely the public direct current bus side of the LLC resonant converter and the alternating current cascade side of the H-bridge unit. When short circuit or open circuit fault occurs on the low-voltage side or the high-voltage side of a certain DC/AC converter, the corresponding bypass circuit realizes the cutting off of the fault DC/AC converter, prevents a public DC bus or a high-voltage side converter chain from short circuit or open circuit, causes greater harm, and simultaneously adjusts a control strategy to ensure that the system reduces the capacity and runs stably. And a bypass circuit at the side of the common direct-current bus and the side of the alternating-current cascade can be selected according to actual requirements. As shown in fig. 4, the bypass circuit has a structure, when the DC/AC converter operates normally, the contacts 1, 2 of the bypass circuit are closed, and the contacts 3, 4 of the bypass circuit are opened, and when a short circuit or an open circuit fault occurs on the low-voltage side or the high-voltage side of the DC/AC converter, the corresponding contacts 1, 2 of the bypass circuit are opened, and the corresponding contacts 3, 4 of the bypass circuit are closed, so as to cut off the faulty DC/AC converter.
Considering that the energy storage element exists in the whole circuit of the energy storage converter, and overvoltage and overcurrent at the moment of starting are prevented, as shown in fig. 5, soft start circuits are arranged between the common direct current bus and the DC/AC converters of all phases and between the DC/AC converters of all phases and a power grid. In addition, a soft start circuit (not shown) may also be provided between the battery unit and the battery-side DC/DC converter. The soft start circuit comprises a main switch KM1, and a soft start resistor R1 and a soft start switch KM2 which are connected in series are connected in parallel at two ends of the main switch KM 1. In the soft start process, the main switch KM1 is controlled to be opened, and the soft start switch KM2 is closed, so that the soft start resistor R1 is switched into the circuit; after the soft start process is finished, the main switch KM1 is controlled to be closed, and the soft start switch KM2 is opened, so that the soft start resistor R1 is bypassed. All or part of the soft start circuit can be selected according to the magnitude of the starting surge current voltage.
As shown in fig. 5, the measurement circuit includes a voltage transformer (PT) and a Current Transformer (CT) that measure the voltage and current of the battery side: PT1 and CT1 (not shown) that measure the common DC bus voltage current, PT3 (not shown) and CT2 that measure the DC/AC converter voltage current, PT2 and CT3 (not shown) that measure the AC grid voltage current, all or a portion of PT and CT may be selected according to a particular control strategy.
In addition, droop control or master-slave control can be adopted among the DC/DC non-isolated converters on the battery sides, so that the charging and discharging of the battery units are controlled to stabilize the voltage of the common direct-current bus and balance the State of Charge (SOC) of each battery unit; the LLC resonant converter is responsible for maintaining the voltage of the support capacitor between the LLC resonant converter and the H-bridge unit, and the H-bridge unit is responsible for controlling the active power and the reactive power. The voltage-sharing, current-sharing and power-balancing of each power module between phases and in the phases are realized by controlling the LLC resonant converter and the H-bridge unit.
On the whole, the energy storage converter adopts a chain topology, realizes high-capacity direct grid connection, fundamentally eliminates the risks of resonance, easy instability of power grid fluctuation, high output harmonic content of a power station and the like during the parallel operation of multiple machines of the traditional low-voltage parallel energy storage power station, easily meets the requirement of the rapid response of the whole station, and saves the investment of SVG, transformers and on-site monitoring devices. Compared with the existing chain type energy storage topology in operation, the battery side adopts the topology with the common direct current bus, so that the stability of system operation is improved; the DC/AC converter adopts an isolated DC/DC converter with an LLC resonant structure, can realize soft switching of a power device in a full working range, ensures the efficiency, simultaneously realizes isolation of a low-voltage side and a high-voltage side of a system, eliminates double-frequency pulsation of a direct-current side, and enhances the safety and stability of the operation of the system.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. An energy storage converter is characterized by comprising a battery unit, a battery side DC/DC module, a common direct current bus and a three-phase DC/AC converter chain which are sequentially connected;
one end of each battery side DC/DC module is connected with the corresponding battery unit, and the other end of each battery side DC/DC module is connected with the common direct current bus after being connected in parallel;
the direct current side of each phase of DC/AC converter chain is connected in parallel to the public direct current bus, and the alternating current side forms a star-shaped or triangular connection mode to be connected with a power grid.
2. The energy storage converter according to claim 1, wherein each phase of the DC/AC converter chain comprises a plurality of DC/AC modules, the DC terminals of the DC/AC modules of each phase of the converter chain are connected in parallel, and the AC terminals of the DC/AC modules of each phase of the converter chain are cascaded.
3. The energy storage converter according to claim 2, wherein the DC/AC module is an isolated DC/AC module comprising a grid-side DC/DC unit and a DC/AC unit.
4. The energy storing converter according to claim 3, wherein said grid side DC/DC unit is an isolated LLC resonant structure.
5. The energy storing converter according to claim 3, wherein said DC/AC unit is an H-bridge configuration.
6. The energy storage converter according to claim 1, wherein a bypass circuit is provided at both ends of each phase DC/AC converter chain.
7. The energy storage converter according to claim 1, wherein soft start circuits are arranged on a line between the battery unit and the battery-side DC/DC converter, a line between the common DC bus and the three-phase converter chain, and a line between the three-phase converter chain and the grid, and each soft start circuit includes a main switch, and a soft start resistor and a soft start switch are connected in series and connected in parallel at two ends of the main switch.
8. The energy storage converter according to claim 1, wherein the battery-side DC/DC module is of a two-level or three-level configuration.
9. The energy storage converter according to claim 1, wherein an LC filter circuit is disposed between one end of the battery-side DC/DC module and the corresponding battery cell.
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| CN201910502297.4A CN112072680A (en) | 2019-06-11 | 2019-06-11 | Energy storage converter |
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| CN201910502297.4A CN112072680A (en) | 2019-06-11 | 2019-06-11 | Energy storage converter |
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| CN113489326A (en) * | 2021-08-20 | 2021-10-08 | 青岛鼎信通讯股份有限公司 | Two-stage DC/AC bidirectional conversion device applied to energy router |
| CN113890072A (en) * | 2021-11-19 | 2022-01-04 | 江苏莱提电气股份有限公司 | Advanced distributed modular wireless parallel dynamic voltage restorer |
| CN114006391A (en) * | 2021-10-28 | 2022-02-01 | 山东泰开直流技术有限公司 | Medium-voltage direct-hanging energy storage converter system and start-stop control method thereof |
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| CN114006391A (en) * | 2021-10-28 | 2022-02-01 | 山东泰开直流技术有限公司 | Medium-voltage direct-hanging energy storage converter system and start-stop control method thereof |
| CN113890072A (en) * | 2021-11-19 | 2022-01-04 | 江苏莱提电气股份有限公司 | Advanced distributed modular wireless parallel dynamic voltage restorer |
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