Energy storage converter system applied to smart power grid area

Abstract

The invention discloses an energy storage converter system applied to an intelligent power grid area, relates to the technical field of converters, realizes bridge connection between the area and a storage battery, realizes bidirectional conversion between direct current of the storage battery and alternating current of a power grid, and lays a foundation for the energy storage system to realize functions of improving electric energy quality, dynamic capacity increasing, photovoltaic absorption and the like of the area. Intelligent management of the charging and discharging process of the storage battery is achieved, the energy utilization efficiency is improved, the requirement for manual intervention is lowered, voltage fluctuation is reduced, and therefore the overall stability and reliability of a power grid are improved; the flexibility of power grid dispatching is enhanced, and the intermittency and uncertainty of renewable energy sources can be dealt with. The scheme is characterized by comprising a main power circuit and a control circuit, the main power circuit comprises a direct current side protection module, a power conversion module, an alternating current side protection module and an alternating current side isolation module; the control circuit comprises a driving module, a signal conditioning module, an auxiliary power supply module and a main control module.

Description

Technical Field

[0001] The present invention relates to the technical field of converters, and particularly to an energy storage converter system applied to a smart grid substation area. Background Art

[0002] With the transformation of the global energy structure and the development of smart grid technology, energy storage technology, as one of the key supporting technologies in smart grids, has become increasingly important. The main function of energy storage technology is to store energy in the power system to balance supply and demand, improve system stability, enhance system scheduling flexibility, etc., which plays an important role in improving the stability and reliability of the power grid. In the substation area of the smart grid, due to its special geographical location and electricity consumption characteristics, the traditional power grid has problems such as unstable power supply and large voltage fluctuations. These problems not only affect the stability of the power system but also cause inconvenience to residents' daily lives and industrial production. Therefore, researching an energy storage converter system applied to the smart grid substation area has important theoretical significance and practical value.

[0003] Currently, most of the energy storage converter systems on the market are general-purpose, and their functions are fixed after leaving the factory and are not easy to change. The substation area is a voltage transformation device applied in a community, and the substation area has the characteristic of complex operating conditions. For the special location of the substation area, the energy storage converter systems on the market are all designed for common operating conditions, and the hardware, control strategies, etc. of the equipment are not specifically designed and optimized for the actual operating conditions of the substation area, nor are there a large amount of substation area operation data as support, nor can they be deeply integrated with the fusion terminal of the smart substation area, and they can no longer adapt to different substation areas. Summary of the Invention

[0004] The present invention provides an energy storage converter system applied to a smart grid substation area, which realizes the bridging between the substation area and the battery, converts the DC of the battery and the AC of the grid bidirectionally, and lays the foundation for the energy storage system to realize functions such as improving the power quality, dynamic capacity increase, and photovoltaic power consumption in the substation area measurement; it can realize the intelligent management of the charging and discharging processes of the battery, not only improving the energy utilization efficiency but also reducing the need for manual intervention, thereby reducing the operation and maintenance costs; by storing and releasing energy in the substation area, it helps to balance the supply and demand relationship of the power grid, reduces voltage fluctuations, and thus improves the overall stability and reliability of the power grid; it can flexibly adjust the charging and discharging strategies of the energy storage device according to the actual needs of the power grid, enhance the flexibility of power grid scheduling, and help to cope with the intermittency and uncertainty of renewable energy.

[0005] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides an energy storage converter system applied to a smart grid substation area, including: a main power circuit and a control circuit.

[0006] The main power circuit includes a DC-side protection module, a power conversion module, an AC-side protection module, and an AC-side isolation module; the DC-side protection module is connected to the battery and is used to control the connection and disconnection with the battery; the power conversion module is connected to the DC-side protection module and is used to invert the direct current output by the battery into an alternating current with the same frequency and phase as the power grid, or to rectify the alternating current input by the power grid into a direct current for charging the battery; the AC-side protection module is connected to the power conversion module and is used to control the connection and disconnection on the AC side; the AC-side isolation module is respectively connected to the AC-side protection module and the power grid and is used for electrical isolation.

[0007] The control circuit includes a driving module, a signal conditioning module, an auxiliary power supply module, and a main control module; the driving module is connected to the power conversion module and is used to drive the power conversion module; the signal conditioning module is respectively connected to the driving module and the main control module and is used to isolate and amplify the control signal sent by the main control module to ensure that the control signal drives the driving module; the auxiliary power supply module is connected to the signal conditioning module and is used for voltage conversion for use by the control circuit; the main control module is connected to the signal conditioning module and is used for signal processing, control decision-making, and communication with the outside.

[0008] Further, for the energy storage converter system applied to the intelligent power grid substation area, the DC-side protection module includes: The DC-side protection module includes a DC contactor, a DC auxiliary contactor, and a first pre-charge resistor; wherein, the DC contactor is in parallel with the DC auxiliary contactor, and the DC auxiliary contactor is in series with the first pre-charge resistor.

[0009] Further, for the energy storage converter system applied to the intelligent power grid substation area, the power conversion module includes: The power conversion module includes a power unit, a main inductor, a damping resistor, and a filter capacitor; wherein, the power unit is in series with the main inductor; the main inductor is in parallel with the damping resistor, and the damping resistor is in series with the filter capacitor.

[0010] Further, for the energy storage converter system applied to the intelligent power grid substation area, the power unit includes: The power unit includes a bus capacitor and an inverter; wherein, the bus capacitor is in parallel with the inverter.

[0011] Further, for the energy storage converter system applied to the intelligent power grid substation area, the inverter includes: The inverter is a single-phase two-level inverter, or a diode-clamped three-level inverter, or a single-phase T-type three-level inverter.

[0012] Further, for the energy storage converter system applied to the intelligent power grid substation area, the power unit includes: The power unit further includes a heat sink.

[0013] Further, for the energy storage converter system applied to the intelligent power grid substation area, the AC side protection module includes: The AC side protection module includes an AC contactor, an AC auxiliary contactor, and a second pre-charge resistor; wherein, the AC contactor and the AC auxiliary contactor are connected in parallel; the AC auxiliary contactor and the second pre-charge resistor are connected in series.

[0014] Further, for the energy storage converter system applied to the intelligent power grid substation area, the AC side isolation module includes: The AC side isolation module is a three-phase isolation transformer.

[0015] The present invention provides an energy storage converter system applied to the intelligent power grid substation area, including: a main power circuit and a control circuit; the main power circuit includes a DC side protection module, a power conversion module, an AC side protection module, and an AC side isolation module; the DC side protection module is connected to the battery and is used to control the on / off of the battery; the power conversion module is connected to the DC side protection module and is used to invert the direct current output by the battery into an alternating current with the same frequency and phase as the power grid, or rectify the alternating current input by the power grid into a direct current for charging the battery; the AC side protection module is connected to the power conversion module and is used to control the on / off of the AC side; the AC side isolation module is respectively connected to the AC side protection module and the power grid and is used for electrical isolation; the control circuit includes a driving module, a signal conditioning module, an auxiliary power supply module, and a main control module; the driving module is connected to the power conversion module and is used to drive the power conversion module; the signal conditioning module is respectively connected to the driving module and the main control module and is used to isolate and amplify the control signal sent by the main control module to ensure that the control signal drives the driving module; the auxiliary power supply module is connected to the signal conditioning module and is used for voltage conversion for use by the control circuit; the main control module is connected to the signal conditioning module and is used for signal processing and external communication. Compared with the prior art, the present invention realizes the bridging between the substation area and the battery, realizes the bidirectional conversion of the direct current of the battery and the alternating current of the power grid, and lays the foundation for the energy storage system to realize functions such as improving the power quality, dynamic capacity increase, and PV accommodation in the substation area measurement; can realize the intelligent management of the charging and discharging processes of the battery, not only improves the energy utilization efficiency, but also reduces the need for manual intervention, thereby reducing the operation and maintenance costs; by storing and releasing energy in the substation area, it helps to balance the power supply and demand relationship of the power grid, reduce voltage fluctuations, and thus improve the overall stability and reliability of the power grid; can flexibly adjust the charging and discharging strategies of the energy storage device according to the actual needs of the power grid, enhance the flexibility of power grid dispatching, and help to cope with the intermittency and uncertainty of renewable energy. Brief Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the description of the embodiments will be briefly introduced below. The accompanying drawings are only for the purpose of showing the embodiments and are not considered to be a limitation of the present invention.

[0017] Figure 1 It is a schematic structural diagram of an energy storage converter system applied to an intelligent power grid substation area in an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a DC side protection module in an embodiment of the present invention; Figure 3 It is a schematic structural diagram of a power conversion module in an embodiment of the present invention; Figure 4 It is a schematic structural diagram of a single-phase two-level type AC converter in an embodiment of the present invention; Figure 5 It is a schematic structural diagram of a diode-clamped three-level type AC converter in an embodiment of the present invention; Figure 6 It is a schematic structural diagram of a single-phase T-type three-level type AC converter in an embodiment of the present invention; Figure 7 It is a schematic structural diagram of an AC side protection module in an embodiment of the present invention; Figure 8 It is a schematic structural diagram of an AC side isolation module in an embodiment of the present invention.

[0018] In the figure, 1. Main power circuit, 11. DC side protection module, 111. DC contactor, 112. DC auxiliary contactor, 113. First pre-charge resistor, 12. Power conversion module, 121. Power unit, 1211. Bus capacitor, 1212. AC converter, 122. Main inductor, 123. Damping resistor, 124. Filter capacitor, 13. AC side protection module, 131. AC contactor, 132. AC auxiliary contactor, 133. Second pre-charge resistor, 14. AC side isolation module, 2. Control circuit, 21. Drive module, 22. Signal conditioning module, 23. Auxiliary power supply module, 24. Main control module. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0020] An embodiment of the present invention provides an energy storage converter system applied to a smart grid substation area, as Figure 1 shown, which includes: a main power circuit 1 and a control circuit 2.

[0021] The main power circuit 1 includes a DC side protection module 11, a power conversion module 12, an AC side protection module 13, and an AC side isolation module 14; the DC side protection module 11 is connected to the battery and is used to control the on / off of the battery; the power conversion module 12 is connected to the DC side protection module 11 and is used to invert the DC power output by the battery into AC power with the same frequency and phase as the grid, or rectify the AC power input from the grid into DC power for charging the battery; the AC side protection module 13 is connected to the power conversion module 12 and is used to control the on / off of the AC side; the AC side isolation module 14 is respectively connected to the AC side protection module 13 and the grid and is used for electrical isolation.

[0022] The control circuit 2 includes a drive module 21, a signal conditioning module 22, an auxiliary power supply module 23, and a main control module 24; the drive module 21 is connected to the power conversion module 12 and is used to drive the power conversion module 12; the signal conditioning module 22 is respectively connected to the drive module 21 and the main control module 24 and is used to isolate and amplify the control signal sent by the main control module 24 to ensure that the control signal drives the drive module 21; the auxiliary power supply module 23 is connected to the signal conditioning module 22 and is used for voltage conversion for use by the control circuit; the main control module 24 is connected to the signal conditioning module 22 and is used for signal processing, control decision-making, and communication with the outside.

[0023] Among them, the drive module 21 is the interface between the control circuit 2 and the power conversion module 12, responsible for receiving control signals and converting them into signals capable of driving the power electronic devices (such as IGBTs, MOSFETs, etc.) in the power conversion module 12. The drive module 21 usually includes isolation and amplification functions to ensure the accuracy and reliability of the control signals. In this system, the drive module 21 is connected to the power conversion module 12 to drive the power conversion module 12 to perform power conversion. The signal conditioning module 22 is responsible for processing the control signals from the main control module 24, including isolation, amplification, etc. The isolation function can prevent electrical interference between the main control module 24 and the drive module 21, improving the safety and reliability of the system. The amplification function can enhance the amplitude of the control signals to ensure that the drive module 21 can accurately receive and execute control instructions. The signal conditioning module 22 is connected to the drive module 21 and the main control module 24 respectively, acting as a bridge to ensure the transmission and execution of control signals. The auxiliary power supply module 23 provides the required power for the control circuit 2, usually including functions such as voltage conversion and voltage regulation. It converts the voltage provided by the battery or the power grid into the voltage required by the control circuit 2, such as converting high-voltage direct current into low-voltage direct current for the control circuit 2 to use. The auxiliary power supply module 23 ensures that the control circuit 2 can obtain stable power under different working conditions, guaranteeing the normal operation of the system. The main control module 24 is the core of the control circuit, responsible for functions such as signal processing, control decision-making, and external communication. It usually includes a microprocessor or a microcontroller, which can generate control signals and send them to the signal conditioning module 22 according to preset control strategies and external instructions. The main control module 24 is also responsible for communicating with external systems (such as monitoring systems, dispatching systems, etc.), receiving external instructions and sending system status information.

[0024] As Figure 2 shown, the DC-side protection module 11 includes: The DC-side protection module 11 includes a DC contactor 111, a DC auxiliary contactor 112, and a first pre-charge resistor 113; among them, the DC contactor 111 is in parallel with the DC auxiliary contactor 112, and the DC auxiliary contactor 112 is in series with the first pre-charge resistor 113.

[0025] Among them, the DC contactor 111 in the DC-side protection module 11 is used to control the connection and disconnection with the battery, and the DC auxiliary contactor 112 and the first pre-charge resistor 113 are used to prevent the generation of spike voltages and inrush currents when the system is powered on from damaging the equipment.

[0026] As Figure 3 shown, the power conversion module 12 includes: The power conversion module 12 includes a power unit 121, a main inductor 122, a damping resistor 123, and a filter capacitor 124. Among them, the power unit 121 is connected in series with the main inductor 122. The main inductor 122 is connected in parallel with the damping resistor 123, and the damping resistor 123 is connected in series with the filter capacitor 124.

[0027] Among them, in the energy storage converter system, the power conversion module 12 is one of the core components, responsible for realizing the conversion of electrical energy, including inverting the direct current output by the battery into alternating current with the same frequency and phase as the power grid, or rectifying the alternating current input from the power grid into direct current for charging the battery. As Figure 3 shown, the power conversion module 12 in this embodiment includes three sets of circuits composed of a power unit 121, a main inductor 122, and a damping resistor 123. The power unit 121 is a key part of the power conversion module 12 and is usually composed of power electronic devices (such as IGBTs, MOSFETs, etc.). The power electronic devices can quickly switch according to the control signal, thereby controlling the flow of current and realizing the conversion of electrical energy. During the inversion process, the main inductor 122 can store energy. When the switching state of the power unit 121 changes, the stored energy is released to help maintain the continuity of the current. During the rectification process, the main inductor 122 also plays a role in smoothing the current and reducing the current ripple. The damping resistor 123 is used to consume the energy stored in the inductor to prevent excessive voltage spikes from occurring when the switching state of the power unit 121 changes. Such voltage spikes may damage the power unit 121 or other circuit components. Therefore, the damping resistor 123 plays a protective role. The damping resistor also helps to reduce the high-frequency noise in the circuit and improve the stability of the circuit. The filter capacitor 124 is used to smooth the voltage waveform, reduce the voltage fluctuation, and improve the voltage stability. During the inversion process, the filter capacitor 124 can store energy. When the current demand increases, the stored energy is released to help maintain the voltage stability. During the rectification process, the filter capacitor 124 also plays a role in smoothing the voltage and reducing the voltage ripple, providing a stable DC voltage output.

[0028] Among them, the power unit 121 includes a bus capacitor 1211 and an inverter 1212. The power unit 121 includes three sets of circuits composed of a bus capacitor 1211 and an inverter 1212, and the bus capacitor 1211 is connected in parallel with the inverter 1212.

[0029] Specifically, the inverter 1212 includes: The inverter 1212 is a single-phase two-level inverter, or a diode-clamped three-level inverter, or a single-phase T-type three-level inverter.

[0030] Among them, as Figure 4As shown, a single-phase two-level converter only needs to control two switching tubes. Generally, the commonly used modulation methods are SVPWM (Space Vector Modulation) and SPWM (Sinusoidal Pulse Width Modulation). For the driving logic of the switching tubes, the driving signals of the upper tube (S1) and the lower tube (S2) are complementary, and a certain dead zone is reserved to prevent the bridge arm from being directly connected.

[0031] As Figure 5 As shown, the diode-clamped three-level converter was proposed in 1980. Since diodes are added at the midpoint of the DC bus capacitor for clamping, this structure is also called the neutral-point clamped converter. Compared with the single-phase two-level converter, the topology of the diode-clamped three-level converter is much more complex. Two additional switching tubes are added to each phase bridge arm, and a pair of clamping diodes are also newly added. In addition to the complex circuit hardware structure, the control aspect is also relatively complex. Taking the driving signals as an example, the driving signals need to meet the following logic: S1 and S3 are complementary, S2 and S4 are complementary, and S1 and S4 cannot be turned on simultaneously. S2 and S3 should ensure that one of them is always turned on within half of the power frequency cycle, so that the output voltage has three levels: high level (+Vdc / 2), zero level (0), and low level (-Vdc / 2).

[0032] As Figure 6 As shown, the topology of the single-phase T-type three-level converter is basically the same as that of the diode-clamped three-level converter. T1 and T3 are complementary, T2 and T4 are complementary, and T1 and T4 cannot conduct simultaneously. Compared with the topology of the diode-clamped three-level converter, the single-phase T-type three-level converter topology uses two fewer diodes, and during the circuit conduction process, the components through which the current flows also decrease, so the conduction loss will be smaller.

[0033] From the perspective of driving, for a three-phase circuit, the diode-clamped three-level converter requires ten independent driving power supplies. However, in the circuit topology of the single-phase T-type three-level converter, the voltage borne by the switching tubes on the bridge arm is the DC bus voltage, while each switching tube in the circuit topology of the diode-clamped three-level converter only bears half of the DC bus voltage.

[0034] In summary, compared with the diode-clamped three-level converter, the single-phase T-type three-level converter is more suitable for applications in low voltage, large current, and low switching frequency situations.

[0035] The power unit 121 includes: The power unit 121 also includes a heat sink.

[0036] Among them, a heat sink is a passive or active heat dissipation device that increases the heat dissipation surface area and accelerates heat transfer, used to quickly conduct the heat generated by electronic components (such as power semiconductors, CPUs, LEDs, etc.) to the surrounding environment, preventing the device from being damaged or its performance from degrading due to overheating.

[0037] As Figure 7 shown, the AC side protection module 13 includes: The AC side protection module 13 includes an AC contactor 131, an AC auxiliary contactor 132, and a second pre-charge resistor 133; among them, the AC contactor 131 and the AC auxiliary contactor 132 are in parallel; the AC auxiliary contactor 132 and the second pre-charge resistor 133 are in series.

[0038] Among them, as Figure 7 shown, the AC side protection module 13 includes three sets of circuits composed of an AC contactor 131, an AC auxiliary contactor 132, and a second pre-charge resistor 133. The AC contactor 131 is a switching device that uses electromagnetic principles to control the on / off of a circuit, mainly used to frequently connect and disconnect AC circuits. In the energy storage converter system, the AC contactor 131 is used to control the on / off of the AC side circuit, realizing the connection and disconnection control of the power grid. The AC contactor 131 and the AC auxiliary contactor 132 are in parallel, which means that in the normal working state, one of them can independently complete the task of connecting and disconnecting the circuit, improving the reliability of the system. The AC auxiliary contactor 132 is usually used for auxiliary control circuits to realize functions such as self-locking and interlocking. In this system, the AC auxiliary contactor 132 and the second pre-charge resistor 133 are in series, which means that the AC auxiliary contactor 132 can control the on / off of the second pre-charge resistor 133, realizing the control and protection of the charging process. The main function of the second pre-charge resistor 133 is to provide an initial charging path for energy storage components such as capacitors when the system starts, preventing the impact current generated by directly connecting the power supply, protecting the circuit and components. The second pre-charge resistor 133 is in series with the AC auxiliary contactor 132 to ensure that when the system starts, the capacitors and other components are pre-charged through the pre-charge resistor 133, and then the circuit is switched to the normal working state through the AC auxiliary contactor 132.

[0039] As Figure 8 shown, the AC side isolation module 14 includes: The AC side isolation module 14 is a three-phase isolation transformer.

[0040] Among them, a three-phase isolation transformer is a transformer designed specifically for three-phase AC power systems. Its core function is to achieve electrical isolation between the input side (primary side) and the output side (secondary side) through the principle of electromagnetic induction, while completing voltage increase or decrease. The windings on its primary and secondary sides are completely independent physically and electrically, without direct connection, and only transfer energy through magnetic coupling. The three-phase structure of the three-phase isolation transformer can handle three-phase (A / B / C) alternating current simultaneously and is suitable for three-phase power supply scenarios such as industrial and commercial applications.

[0041] An embodiment of the present invention provides an energy storage converter system applied to an intelligent power grid substation area, including: a main power circuit and a control circuit; the main power circuit includes a DC side protection module, a power conversion module, an AC side protection module, and an AC side isolation module; the DC side protection module is connected to the battery and is used to control the on / off of the connection with the battery; the power conversion module is connected to the DC side protection module and is used to invert the direct current output by the battery into alternating current with the same frequency and phase as the power grid, or rectify the alternating current input by the power grid into direct current for charging the battery; the AC side protection module is connected to the power conversion module and is used to control the on / off of the AC side; the AC side isolation module is respectively connected to the AC side protection module and the power grid and is used for electrical isolation; the control circuit includes a driving module, a signal conditioning module, an auxiliary power supply module, and a main control module; the driving module is connected to the power conversion module and is used to drive the power conversion module; the signal conditioning module is respectively connected to the driving module and the main control module and is used to isolate and amplify the control signal sent by the main control module to ensure that the control signal drives the driving module; the auxiliary power supply module is connected to the signal conditioning module and is used for voltage conversion for use by the control circuit; the main control module is connected to the signal conditioning module and is used for signal processing and communication with the outside. Compared with the prior art, the embodiment of the present invention realizes the bridging between the substation area and the battery, performs bidirectional conversion between the direct current of the battery and the alternating current of the power grid, and lays the foundation for the energy storage system to realize functions such as improving the power quality, dynamic capacity increase, and PV accommodation in the substation area measurement; it can realize intelligent management of the charging and discharging processes of the battery, not only improving the energy utilization efficiency but also reducing the need for manual intervention, thereby reducing the operation and maintenance costs; by storing and releasing energy in the substation area, it helps to balance the power supply and demand relationship of the power grid, reduces voltage fluctuations, and thus improves the overall stability and reliability of the power grid; it can flexibly adjust the charging and discharging strategies of the energy storage device according to the actual needs of the power grid, enhancing the flexibility of power grid dispatching and helping to cope with the intermittency and uncertainty of renewable energy.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and the description of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage converter system applied to a smart grid station, characterized in that: include: Main power circuit and control circuit; The main power circuit comprises a DC side protection module, a power conversion module, an AC side protection module and an AC side isolation module; The DC side protection module is connected to the battery and is used to control the on and off of the battery; the power conversion module is connected to the DC side protection module and is used to invert the DC power output by the battery into AC power with the same frequency and phase as the power grid, or rectify the AC power input by the power grid into DC power for charging the battery; the AC side protection module is connected to the power conversion module and is used to control the on and off of the AC side; the AC side isolation module is respectively connected to the AC side protection module and the power grid for electrical isolation; The control circuit includes a driving module, a signal conditioning module, an auxiliary power supply module and a main control module; the driving module is connected to the power conversion module for driving the power conversion module; the signal conditioning module is respectively connected to the driving module and the main control module for isolating and amplifying the control signal sent by the main control module to ensure that the control signal drives the driving module; the auxiliary power supply module is connected to the signal conditioning module for voltage conversion for use by the control circuit; the main control module is connected to the signal conditioning module for signal processing, control decision-making and external communication.

2. The energy storage converter system applied to a smart grid area according to claim 1 is characterized in that: The DC side protection module comprises: The DC side protection module includes a DC contactor, a DC auxiliary contactor and a first pre-charging resistor; wherein the DC contactor is connected in parallel with the DC auxiliary contactor, and the DC auxiliary contactor is connected in series with the first pre-charging resistor.

3. The energy storage converter system applied to a smart grid area according to claim 1 is characterized in that: The power conversion module comprises: The power conversion module comprises a power unit, a main inductor, a damping resistor and a filter capacitor; wherein the power unit is connected in series with the main inductor; the main inductor is connected in parallel with the damping resistor, and the damping resistor is connected in series with the filter capacitor.

4. The energy storage converter system applied to a smart grid area according to claim 3 is characterized in that: The power unit comprises: The power unit comprises a bus capacitor and an AC converter; wherein the bus capacitor is connected in parallel with the AC converter.

5. The energy storage converter system applied to a smart grid area according to claim 4 is characterized in that: The AC device comprises: The AC converter is a single-phase two-level AC converter, or a diode clamped three-level AC converter, or a single-phase T-type three-level AC converter.

6. The energy storage converter system applied to a smart grid area according to claim 1 is characterized in that: The power unit comprises: The power unit also includes a heat sink.

7. The energy storage converter system applied to a smart grid area according to claim 1 is characterized in that: The AC side protection module includes: The AC side protection module includes an AC contactor, an AC auxiliary contactor and a second pre-charging resistor; wherein the AC contactor and the AC auxiliary contactor are connected in parallel; and the AC auxiliary contactor and the second pre-charging resistor are connected in series.

8. The energy storage converter system applied to a smart grid area according to claim 1, characterized in that: The AC side isolation module includes: The AC side isolation module is a three-phase isolation transformer.

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