DC power converter for new energy generation, energy storage and microgrid bridging

Abstract

The present invention provides a DC power converter for bridge-connecting new energy generation, energy storage, and microgrids, which includes a DC power output port (Vout+) connected in series with a noise elimination circuit to provide a stable DC output, and the noise elimination circuit includes a differential amplifier, a reference voltage output module, a current sampling circuit, a transient response enhancement circuit, a PMOS power transistor, and a four-resistor negative feedback network to form a closed loop, with the reference voltage output module connected to the differential amplifier, and an input power source connected to resistor R3, the reference voltage output module, and the PMOS power transistor.The DC power converter based on the resistive feedback network of the present invention is easy to modularize, and the combination of the PMOS transistor and the resistive feedback network structure has the effect of significantly suppressing voltage noise.

Description

[Technical Field]

[0001] The present invention relates to the technical field of power supply, and more particularly to a DC power conversion device for bridging new energy generation, energy storage, and microgrids. [Background technology]

[0002] In conventional large-scale battery energy storage systems, when the same or different types of energy storage battery packs operate in parallel, the energy storage goal is generally achieved through the following process: They are connected in parallel to a DC bus via different bidirectional DC / DC converters or to an AC bus via a bidirectional DC / AC inverter. According to a planned control strategy, they simultaneously or time-share power is transmitted to and received from a designated power network, or power is supplied to a power terminal load, and the AC-DC bus charges the battery packs in the reverse direction. In such battery energy storage methods, each battery pack has only one input / output to and from the bus, and the current direction must be repeatedly switched during charging and discharging. This results in a certain switching time difference, which affects the system's response speed and poses a certain safety risk when switching large-power loads. Furthermore, the filter and noise elimination circuits in conventional voltage conversion circuits are simple and unified, and cannot be effectively designed according to the characteristics of the circuit itself. Summary of the Invention

[0003] The present invention aims to provide a DC power conversion device for bridging new energy generation, energy storage, and microgrids, which has a simple structure, is easy to modularize, and can achieve smooth buffering and dynamic storage of electrical energy with simultaneous input and output online.

[0004] The present invention is realized by the following solution: A DC power converter for bridging new energy generation, energy storage, and microgrids includes a DC power generation input port Vin+, a DC regulated power output port Vout+, an energy storage battery pack access port Vbat+, a common negative port V-, a forward charge control IGBT (insulated gate bipolar transistor) T-ci, a charge energy storage inductance Lc, a charge freewheeling diode D1, and a discharge control IGBT The DC power supply output port (Vout+) includes a noise elimination circuit connected in series to provide a stable DC output. The noise elimination circuit includes a differential amplifier, a reference voltage output module, a current sampling circuit, a transient response enhancement circuit, a PMOS power transistor, and a four-resistor negative feedback network, forming a closed loop. The reference voltage output module is connected to the differential amplifier. The input power supply is connected to resistor R3, the reference voltage output module, and the PMOS power transistor. The reference voltage output module is connected to the differential amplifier. The differential amplifier is connected to the input end of the transient response enhancement circuit. The output end of the transient response enhancement circuit is connected to the input end of the PMOS power transistor and the current sampling circuit. The output end of the current sampling circuit is connected to resistor R1. The output end of the PMOS power transistor is connected to resistor R4. The reference voltage output module generates a voltage using a bandgap reference circuit. The resistor R2 is grounded, and the differential amplifier is connected to resistor R1.

[0005] Preferably, the anode of the input-output pass-through and reverse isolation diode D4 and the collector of the forward charge control IGBT T-ci are connected to the DC power generation input port Vin+, the cathode of the input-output pass-through and reverse isolation diode D4 and the cathode of the discharge flywheel diode D2 are connected to the DC regulated power supply output port Vout+, the emitter of the forward charge control IGBT T-ci is connected to the cathode of the charge flywheel diode D1, the collector of the discharge control IGBT Td is connected to the anode of the discharge flywheel diode D2, one end of the charge energy storage inductance Lc is connected to the connection terminal between the forward charge control IGBT T-ci and the charge flywheel diode D1, and one end of the discharge energy storage inductance Ld is connected to the connection terminal between the forward charge control IGBT T-ci and the charge flywheel diode D1, The other end of the charging energy storage inductance Lc, the other end of the discharging energy storage inductance Ld, and the positive terminal of the energy storage battery pack are respectively connected to the energy storage battery pack access port Vbat+, and the anode of the charging flywheel diode D1, the negative terminal of the energy storage battery pack, and the emitter of the discharge control IGBT Td are respectively connected to the common negative port V-.

[0006] Preferably, the power supply further includes a reverse charge control IGBT T-co, a first reverse charge isolation diode D, and a second reverse charge isolation diode D3, the second reverse charge isolation diode D3 being connected in series to the connection line between the forward charge control IGBT T-ci and the charge flywheel diode D1, the cathode of the second reverse charge isolation diode D3 being connected to one end of the charge energy storage inductance Lc, the collector of the reverse charge control IGBT T-co being connected to the DC regulated power supply output port Vout+, the emitter of the reverse charge control IGBT T-co being connected to the anode of the first reverse charge isolation diode D, the cathode of the first reverse charge isolation diode D being connected to one end of the charge energy storage inductance Lc, and the reverse charge control IGBT T-co and the first reverse charge isolation diode D together forming an independent reverse charging circuit.

[0007] Preferably, the forward charge control IGBT T-ci, the charge energy storage inductance Lc and the charge flywheel diode D1 together constitute a Buck step-down charging circuit, the discharge control IGBT Td, the discharge energy storage inductance Ld and the discharge flywheel diode D2 together constitute a Boost step-up discharging circuit, and the Buck step-down charging circuit, the energy storage battery pack and the Boost step-up discharging circuit together constitute an “H” type DC-B-DC circuit architecture.

[0008] Preferably, the battery pack further includes a high-frequency filtering capacitor and a low-frequency filtering electrolytic capacitor, the positive terminal of the low-frequency filtering electrolytic capacitor is connected to the energy storage battery pack access port Vbat+, the negative terminal of the low-frequency filtering electrolytic capacitor is connected to the common negative port V-, and both ends of the high-frequency filtering capacitor are connected in parallel to both ends of the low-frequency filtering electrolytic capacitor.

[0009] Preferably, the energy storage battery pack is provided with a battery management system, and the energy storage battery pack may be a nickel-metal hydride battery pack, a lithium-ion battery pack, a lead-acid battery pack, etc. The gates of all the IGBTs (including the forward charge control IGBT T-ci, the discharge control IGBT Td, and the reverse charge control IGBT T-co) are respectively connected to corresponding IGBT drivers IGBT Drivers, and the forward charge control IGBT T-ci, the discharge control IGBT Td, and the reverse charge control IGBT T-co are respectively controlled by the corresponding IGBT drivers IGBT Drivers.

[0010] Preferably, the DC power generation power input ports Vin+, DC regulated power output ports Vout+, energy storage battery pack access ports Vbat+, and common negative port V- of a plurality of DC power conversion devices are connected in parallel in one-to-one correspondence to realize a single-path power expansion function, and the types of energy storage battery packs connected to the energy storage battery pack access ports Vbat+ are the same, for example, the energy storage battery packs are all nickel-metal hydride battery packs, lithium-ion battery packs, etc. The DC power generation power input ports Vin+, DC regulated power output ports Vout+, and common negative port V- of a plurality of DC power conversion devices are connected in parallel in one-to-one correspondence, and each energy storage battery pack access port Vbat+ is independent to realize a capacity expansion function or a hybrid energy storage combined function, and the types of energy storage battery packs connected to each energy storage battery pack access port Vbat+ are all the same, some of them are the same, some of them are different, or completely different, for example, the DC power If there are three DC power conversion devices, the energy storage battery packs connected to the energy storage battery pack access ports Vbat+ of the three DC power conversion devices are all nickel-metal hydride battery packs; alternatively, the energy storage battery packs connected to the energy storage battery pack access ports Vbat+ of two of the DC power conversion devices are nickel-metal hydride battery packs and the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of the other DC power conversion device is a lithium-ion battery pack; alternatively, the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power conversion device is a nickel-metal hydride battery pack, the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power conversion device is a lithium-ion battery pack, and the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power conversion device is a lead-acid battery pack.

[0011] The present invention provides a DC power conversion device for bridging new energy generation, energy storage and microgrids, and can achieve the following beneficial technical effects:

[0012] 1. The present invention has a simple structure and is easy to modularize. It forms an "H" type structure, and the charge and discharge circuits can operate independently in a time-division manner, and can also operate simultaneously based on the capacitor effect of the battery pack.

[0013] 2. The unidirectional nature of the charge / discharge circuit means that the discharge side is always online, eliminating the need for bidirectional switching, improving the response speed and safety / reliability of the energy storage system.

[0014] 3. The present invention groups multiple types of battery packs and connects them in parallel. When applied, the control system adjusts the output ratio according to the load demand, eliminating the need for constant online switching. At the same time, it responds to the energy input from the power generation side at any time, keeping the energy storage battery pack in a state of dynamic online input-output power adjustment all the time, and effectively plays the role of a power buffer.

[0015] 4. The reverse charge control IGBT (T-co) and the first reverse charge isolation diode (D) together form an independent reverse charge circuit, achieving a significant improvement in reverse charge efficiency.

[0016] 5. The noise elimination circuit of the present invention can reduce voltage ripple, and a feedback network consisting of resistors R1, R2, R3, and R4 comprehensively regulates the output of the transient response circuit, the current sampling circuit, and the PMOS power transistor, respectively, and feeds back the output voltage to the differential amplifier. This resistor network greatly improves the stability of the output voltage, and the transient response enhancement circuit greatly enhances the transient response capability.

[0017] 6. The present invention has the effect of greatly suppressing voltage noise by using a PMOS transistor and a resistor feedback network structure. [Brief explanation of the drawings]

[0018] In order to more clearly describe the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces drawings used in the description of the embodiments or prior art. Of course, the drawings described below are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without creative work. [Figure 1] 1 is a circuit block diagram of a DC power conversion device based on a resistive feedback network in a first embodiment. [Figure 2] FIG. 2 is a schematic diagram of the DC power conversion device in FIG. [Figure 3] FIG. 1 is a schematic diagram showing ports of two DC power conversion devices connected in parallel to each other. [Figure 4] 2 is a schematic diagram showing connections between the DC power conversion device and each component. FIG. [Figure 5] FIG. 2 is a diagram illustrating the configuration of a noise removal circuit. [Figure 6] This is a schematic diagram showing that the energy storage battery pack access ports Vbat+ of the two DC power conversion devices are independent of each other, and the other three ports are connected in parallel with each other. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following provides a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the drawings in the embodiments of the present invention, but of course, the described embodiments are only a part of the embodiments of the present invention, and are not all of the embodiments. All other embodiments that can be obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall be included in the scope of the claims of the present invention.

[0020] Example 1 As shown in FIG. 1, the DC power converter for bridging new energy generation, energy storage, and microgrids includes a DC power generation input port Vin+, a DC regulated power output port Vout+, an energy storage battery pack access port Vbat+, a common negative port V-, a forward charge control IGBT (insulated gate bipolar transistor) T-ci, a charge energy storage inductance Lc, a charge freewheeling diode D1, a discharge control IGBT Td, a discharge energy storage inductance Ld, a discharge freewheeling diode D2, an input-output pass-through and reverse isolation diode D4, an energy storage battery pack BAT, a reverse charge control IGBT T-co, a first reverse charge isolation diode D, a second reverse charge isolation diode D3, a high-frequency filtering capacitor C1, and a low-frequency filtering electrolytic capacitor C2. The anode of the input-output pass-through and reverse isolation diode D4, the forward charge control IGBT T-co, a first reverse charge isolation diode D, a second reverse charge isolation diode D3, a high-frequency filtering capacitor C1, and a low-frequency filtering electrolytic capacitor C2 are connected to the anode of the input-output pass-through and reverse isolation diode D4. The collector of T-ci is connected to the DC power supply input port Vin+, the cathode of the input-output pass-through and reverse isolation diode D4 and the cathode of the discharge freewheeling diode D2 are connected to the DC regulated power supply output port Vout+, the emitter of the forward charge control IGBT T-ci is connected to the cathode of the charge freewheeling diode D1 via the second reverse isolation diode D3, and the cathode of the second reverse charge isolation diode D3 is connected to the cathode of the charge freewheeling diode D1, the collector of the discharge control IGBT Td is connected to the anode of the discharge freewheeling diode D2, one end of the charge energy storage inductance Lc is connected to the connection terminal of the second reverse charge isolation diode D3 and the charge freewheeling diode D1, the collector of the reverse charge control IGBT T-co is connected to the DC regulated power supply output port Vout+, and the emitter of the reverse charge control IGBT The emitter of T-ci is connected to the anode of the first reverse charge isolation diode D, the cathode of the first reverse charge isolation diode D is connected to one end of the charge energy storage inductance Lc, and one end of the discharge energy storage inductance Ld is connected to the discharge control IGBTThe other end of the charge energy storage inductance Lc, the other end of the discharge energy storage inductance Ld, and the positive terminal of the energy storage battery pack BAT are respectively connected to the energy storage battery pack access port Vbat+. The positive terminal of the low-frequency filtering electrolytic capacitor C2 is connected to the energy storage battery pack access port Vbat+. Both ends of the high-frequency filtering capacitor C1 are connected in parallel to both ends of the low-frequency filtering electrolytic capacitor C2. The anode of the charge freewheeling diode D1, the negative terminal of the energy storage battery pack BAT, the emitter of the discharge control IGBT Td, and the negative terminal of the low-frequency filtering electrolytic capacitor C2 are respectively connected to the common negative port V-. The forward charge control IGBT T-ci, the charge energy storage inductance Lc, the charge freewheeling diode D1, and the second reverse charge isolation diode D3 together form a Buck step-down charging circuit. The discharge control IGBT The reverse charge control IGBT T-co, the first reverse charge isolation diode D, and the Boost step-up discharge circuit together constitute a reverse independent charging circuit. The Buck step-down charging circuit, the energy storage battery pack, and the Boost step-up discharge circuit together constitute an "H" type DC-B-DC circuit architecture. The energy storage battery pack is provided with a battery management system, and the energy storage battery pack may be a nickel-metal hydride battery pack, a lithium-ion battery pack, a lead-acid battery pack, etc. Figure 2 is a schematic diagram of the DC power conversion device in Figure 1. The charge freewheeling diode D1, discharge freewheeling diode D2, first reverse charge isolation diode D, and second reverse charge isolation diode D3 are all Schottky type. The specific electrical parameters of the forward charge control IGBT T-ci, charge energy storage inductance Lc, discharge control IGBT Td, discharge energy storage inductance Ld, and reverse charge control IGBT T-co are selected according to the voltage-current level on the DC side of the system, the frequency of the pseudo-operating situation, and the set power level. All IGBTs (forward charge control IGBT T-ci, discharge control IGBTThe gates of the forward charge control IGBT T-ci, the discharge control IGBT Td, and the reverse charge control IGBT T-co are respectively connected to the corresponding IGBT drivers IGBT Drivers, and the forward charge control IGBT T-ci, the discharge control IGBT Td, and the reverse charge control IGBT T-co are respectively controlled by the corresponding IGBT drivers IGBT Drivers.

[0021] The DC power generation input ports Vin+, DC regulated power output ports Vout+, energy storage battery pack access ports Vbat+, and common negative port V- of a plurality of DC power conversion devices are connected in parallel in a one-to-one correspondence to realize a single-path power expansion function, and the types of energy storage battery packs connected to the energy storage battery pack access ports Vbat+ are the same, for example, the energy storage battery packs are all nickel-metal hydride battery packs, lithium-ion battery packs, etc. The DC power generation input ports Vin+, DC regulated power output ports Vout+, and common negative port V- of a plurality of DC power conversion devices are connected in parallel in a one-to-one correspondence, and each energy storage battery pack access port Vbat+ is independent to realize a capacity expansion function or a hybrid energy storage combined function, and the types of energy storage battery packs connected to each energy storage battery pack access port Vbat+ are all the same, partially the same, partially different, or completely different, for example, If there are three DC power conversion devices, the energy storage battery packs connected to the energy storage battery pack access ports Vbat+ of the three DC power conversion devices are all nickel-metal hydride battery packs; alternatively, the energy storage battery packs connected to the energy storage battery pack access ports Vbat+ of two of the DC power conversion devices are nickel-metal hydride battery packs and the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of the other DC power conversion device is a lithium-ion battery pack; alternatively, the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power conversion device is a nickel-metal hydride battery pack, the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power conversion device is a lithium-ion battery pack, and the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power conversion device is a lead-acid battery pack.FIG. 3 is a schematic diagram showing that the ports of the two DC power conversion devices are connected in parallel to each other, and FIG. 6 is a schematic diagram showing that the energy storage battery pack access ports Vbat+ of the two DC power conversion devices are independent of each other, and the other three ports are connected in parallel to each other.

[0022] A schematic diagram of the connections between the DC power converter and each control component is shown in Figure 4. A renewable energy source, such as solar power, is connected to the DC power converter's DC generator input port Vin+ and common negative port V-. The DC side of a power load, such as a DC-AC inverter PCS, is connected to the DC regulated power output port Vout+ and common negative port V-. The positive and negative terminals of the energy storage battery pack are connected to the energy storage battery pack access port Vbat+ and common negative port V-. Typically, the energy storage battery pack's operating voltage is less than the DC generator input voltage and less than the DC regulated power supply output voltage (the rated DC input voltage of a typical low-voltage utility frequency DC-AC inverter PCS is around 750 Vdc). The energy storage battery pack has an independent battery management system (BMS).

[0023] Example 2 The DC power supply output port is further connected in series with a noise elimination circuit to provide a stable DC output. The noise elimination circuit includes a differential amplifier, a reference voltage output module, a current sampling circuit, a transient response enhancement circuit, a PMOS transistor, and a four-resistor negative feedback network, forming a closed loop. The reference voltage output module is connected to the differential amplifier. The input power supply is connected to resistor R3, the reference voltage output module, and the PMOS power transistor. The reference voltage output module is connected to the differential amplifier. The differential amplifier is connected to the input end of the transient response enhancement circuit. The output end of the transient response enhancement circuit is connected to the input ends of the PMOS power transistor and the current sampling circuit. The output end of the current sampling circuit is connected to resistor R1. The output end of the PMOS power transistor is connected to resistor R4. The reference voltage output module uses a bandgap reference circuit to generate a voltage. The resistor R2 is grounded. The differential amplifier is connected to resistor R1. The noise elimination circuit of the present application can significantly reduce voltage ripple, and a feedback network consisting of resistors R1, R2, R3, and R4 comprehensively adjusts the output of the transient response circuit, current sampling circuit, and PMOS power transistor, respectively, and feeds back the output voltage to the differential amplifier. This resistor network significantly improves the stability of the output voltage, and the transient response enhancement circuit significantly enhances the transient response capability. The combination of the PMOS transistor and resistor feedback network structure of the present application has the effect of significantly suppressing voltage noise.

[0024] The DC power converter based on the resistive feedback network of the present invention has a simple structure and is easily modularized. When external ports are directly connected in parallel, charging and discharging power can be expanded as needed. When the energy storage battery pack access port Vbat+ is independently isolated, different types of energy storage battery packs can be connected to form a hybrid energy storage circuit, simultaneously expanding capacity. The DC power converter based on the resistive feedback network of the present invention, which outputs a stable voltage, is primarily used in DC bus-based energy storage systems where the input energy fluctuates relatively frequently. Its main features are that the input and output terminals are relatively spaced apart, and the energy storage battery packs are connected in parallel between the input and output terminals, forming an "H" structure. The charging and discharging circuits can operate independently in a time-sharing manner, or simultaneously based on the capacitor effect of the battery packs. Importantly, the unidirectional characteristics of the charging and discharging circuits allow the discharge side to always be online, eliminating the need for bidirectional switching, thereby improving the response speed, safety, and reliability of the energy storage system.

[0025] Energy storage systems are divided into several basic types, such as power, capacity, and hybrid types, depending on the corresponding power load. Considering factors such as combination cost and management control, the same type of battery is often only suitable for one of these energy storage types. For some power grids or loads with special requirements, such as those with short-term high power demands and long-term capacity demands (e.g., regional power grids and microgrids), hybrid energy storage is the optimal choice. Different types of batteries within the same energy storage system cannot be directly connected in parallel. The DC power conversion device of the present invention, which outputs a stable voltage based on a resistive feedback network, allows multiple types of battery packs (including, but not limited to, nickel-metal hydride battery packs and lithium-ion battery packs) to be grouped and connected in parallel. When applied, the control system adjusts the output ratio according to load demand, eliminating the need for constant online switching. At the same time, it responds to the energy input from the power generation side at any time, allowing the energy storage battery pack to dynamically adjust its input-output power online all the time, effectively fulfilling the role of a power buffer.

[0026] The DC power converter based on the resistive feedback network of the present invention significantly improves the reverse charging efficiency by providing a reverse charging control IGBT (T-co), a first reverse charging isolation diode (D) and a second reverse charging isolation diode (D3). The second reverse charging isolation diode (D3) is connected in series to the connection line between the forward charging control IGBT (T-ci) and the charge freewheeling diode (D1), and the cathode of the second reverse charging isolation diode (D3) is connected to one end of the charge energy storage inductance (Lc). The collector of the reverse charging control IGBT (T-co) is connected to the DC regulated power supply output port (Vout+). The emitter of the reverse charging control IGBT (T-co) is connected to the anode of the first reverse charging isolation diode (D), and the cathode of the first reverse charging isolation diode (D) is connected to one end of the charge energy storage inductance (Lc). The reverse charging control IGBT (T-co) and the first reverse charging isolation diode (D) together form an independent reverse charging circuit, which significantly improves reverse charging efficiency.

[0027] In addition, the present application provides a high-frequency filtering capacitor and a low-frequency filtering electrolytic capacitor to achieve simultaneous high-frequency and low-frequency filtering, and the circuit further includes a high-frequency filtering capacitor and a low-frequency filtering electrolytic capacitor, which significantly improves the stability of the circuit's output frequency.

[0028] Example 3 There is also an embodiment including a DC power generation power input port Vin+, a DC regulated power output port Vout+, an energy storage battery pack access port Vbat+, a common negative port V-, a forward charge control IGBT (insulated gate bipolar transistor) T-ci, a charge energy storage inductance Lc, a charge freewheeling diode D1, a discharge control IGBT Td, a discharge energy storage inductance Ld, a discharge freewheeling diode D2, an input-output pass-through and reverse isolation diode D4, and an energy storage battery pack, wherein the DC power supply output port (Vout+) is connected in series with a noise elimination circuit to provide a stable DC output, and the noise elimination circuit includes a differential amplifier, a reference voltage output module, a current sampling circuit, a transient response enhancement circuit, a PMOS power transistor, and a four-resistor negative feedback network to form a closed loop, and the reference voltage output module is connected to the differential amplifier, and the input The power supply is connected to resistor R3, the reference voltage output module and the PMOS power transistor, the reference voltage output module is connected to a differential amplifier, the differential amplifier is connected to the input terminal of a transient response enhancement circuit, the output terminal of the transient response enhancement circuit is connected to the input terminal of the PMOS power transistor and the current sampling circuit, the output terminal of the current sampling circuit is connected to resistor R1, and the output terminal of the PMOS power transistor is connected to resistor R4, wherein the reference voltage output module generates a voltage using a bandgap reference circuit, resistor R2 is grounded, and the differential amplifier is connected to resistor R1.

[0029] In some embodiments, an anode of the input-output pass-through and reverse isolation diode D4 and a collector of the forward charge control IGBT T-ci are respectively connected to a DC power generation power input port Vin+, a cathode of the input-output pass-through and reverse isolation diode D4 and a cathode of the discharge freewheel diode D2 are respectively connected to a DC regulated power supply output port Vout+, an emitter of the forward charge control IGBT T-ci is connected to a cathode of the charge freewheel diode D1, a collector of the discharge control IGBT Td is connected to an anode of the discharge freewheel diode D2, one end of the charge energy storage inductance Lc is connected to a connection terminal between the forward charge control IGBT T-ci and the charge freewheel diode D1, and one end of the discharge energy storage inductance Ld is connected to a connection terminal between the forward charge control IGBT T-ci and the charge freewheel diode D1, The anode of the charge freewheel diode D1, the negative terminal of the energy storage battery pack, and the emitter of the discharge control IGBT Td are connected to the connection terminal between Td and the discharge freewheel diode D2, the other end of the charge energy storage inductance Lc, the other end of the discharge energy storage inductance Ld, and the positive terminal of the energy storage battery pack are respectively connected to the energy storage battery pack access port Vbat+, and the anode of the charge freewheel diode D1, the negative terminal of the energy storage battery pack, and the emitter of the discharge control IGBT Td are respectively connected to the common negative port V-.

[0030] In some embodiments, the power supply further includes a reverse charge control IGBT T-co, a first reverse charge isolation diode D, and a second reverse charge isolation diode D3, the second reverse charge isolation diode D3 being connected in series to a connection line between the forward charge control IGBT T-ci and the charge freewheeling diode D1, the cathode of the second reverse charge isolation diode D3 being connected to one end of a charge energy storage inductance Lc, the collector of the reverse charge control IGBT T-co being connected to the DC regulated power supply output port Vout+, the emitter of the reverse charge control IGBT T-co being connected to the anode of the first reverse charge isolation diode D, the cathode of the first reverse charge isolation diode D being connected to one end of the charge energy storage inductance Lc, and the reverse charge control IGBT T-co and the first reverse charge isolation diode D together forming a reverse independent charging circuit.

[0031] In some embodiments, the forward charge control IGBT T-ci, the charge energy storage inductance Lc, and the charge freewheel diode D1 together constitute a Buck step-down charging circuit, the discharge control IGBT Td, the discharge energy storage inductance Ld, and the discharge freewheel diode D2 together constitute a Boost step-up discharging circuit, and the Buck step-down charging circuit, the energy storage battery pack, and the Boost step-up discharging circuit together constitute an H-type DC-B-DC circuit architecture.

[0032] In some embodiments, the power supply further includes a high-frequency filtering capacitor and a low-frequency filtering electrolytic capacitor, wherein the positive terminal of the low-frequency filtering electrolytic capacitor is connected to the energy storage battery pack access port Vbat+, the negative terminal of the low-frequency filtering electrolytic capacitor is connected to the common negative port V-, and both ends of the high-frequency filtering capacitor are connected in parallel to both ends of the low-frequency filtering electrolytic capacitor.

[0033] In some embodiments, the energy storage battery pack is provided with a battery management system, and the energy storage battery pack may be a nickel-metal hydride battery pack, a lithium-ion battery pack, a lead-acid battery pack, etc. The gates of all IGBTs (including the forward charge control IGBT T-ci, the discharge control IGBT Td, and the reverse charge control IGBT T-co) are respectively connected to corresponding IGBT drivers IGBT Drivers, and the forward charge control IGBT T-ci, the discharge control IGBT Td, and the reverse charge control IGBT T-co are respectively controlled by the corresponding IGBT drivers IGBT Drivers.

[0034] In some embodiments, the DC power generation input ports Vin+, DC regulated power output ports Vout+, energy storage battery pack access ports Vbat+, and common negative port V- of a plurality of DC power conversion devices are connected in parallel in a one-to-one correspondence to realize a single-path power expansion function, and the types of energy storage battery packs connected to the energy storage battery pack access ports Vbat+ are the same, for example, the energy storage battery packs are all nickel-metal hydride battery packs, lithium-ion battery packs, etc. The DC power generation input ports Vin+, DC regulated power output ports Vout+, and common negative port V- of a plurality of DC power conversion devices are connected in parallel in a one-to-one correspondence, and each energy storage battery pack access port Vbat+ is independent to realize a capacity expansion function or a hybrid energy storage combined function, and the types of energy storage battery packs connected to each energy storage battery pack access port Vbat+ are all the same, some of the same, some of different, or completely different, for example, direct In the case where there are three DC power converters, the energy storage battery packs connected to the energy storage battery pack access ports Vbat+ of the three DC power converters are all nickel-metal hydride battery packs; alternatively, the energy storage battery packs connected to the energy storage battery pack access ports Vbat+ of two of the DC power converters are nickel-metal hydride battery packs and the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of the other DC power converter is a lithium-ion battery pack; alternatively, the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power converter is a nickel-metal hydride battery pack, the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power converter is a lithium-ion battery pack, and the energy storage battery pack connected to the energy storage battery pack access port Vbat+ of one DC power converter is a lead-acid battery pack.

[0035] The present invention provides a DC power conversion device based on a resistive feedback network, and the beneficial technical effects that can be achieved are as follows:

[0036] The present invention has a simple structure and is easily modularized. It forms an "H"-shaped structure, allowing the charge / discharge circuits to operate independently in a time-sharing manner, or simultaneously based on the capacitor effect of the battery pack. The unidirectional characteristics of the charge / discharge circuit allow the discharge side to always be online, eliminating the need for bidirectional switching, improving the response speed, safety, and reliability of the energy storage system. The present invention allows multiple types of battery packs to be grouped and connected in parallel. When applied, the control system adjusts the output ratio according to load demand, eliminating the need for constant online switching. At the same time, it responds to the energy input from the power generation side as needed, allowing the energy storage battery pack to dynamically adjust input-output power online all the time, effectively fulfilling its role as a power buffer. The reverse charge control IGBT (T-co) and the first reverse charge isolation diode (D) together form a reverse independent charging circuit, significantly improving reverse charging efficiency. The noise elimination circuit of the present invention can reduce voltage ripple, and a feedback network consisting of resistors R1, R2, R3, and R4 is used to comprehensively adjust the output of the transient response circuit, current sampling circuit, and PMOS power transistor, respectively, and feed back the output voltage to the differential amplifier. This resistor network greatly improves the stability of the output voltage, and the transient response enhancement circuit greatly enhances the transient response capability. The combination of the PMOS transistor and resistor feedback network structure in the present invention has the effect of greatly suppressing voltage noise.

[0037] Although detailed above, the present specification uses specific examples to explain the principles and embodiments of the present invention, and the explanation of the above examples is only used to help understand the core idea of ​​the present invention, and at the same time, those skilled in the art can make any changes in the specific embodiments and application scope according to the idea and method of the present invention. In short, the contents of the specification should not be understood as limiting the present invention.

Claims

1. A DC power conversion device for bridging new energy generation, energy storage, and microgrids, comprising: a DC power generation power input port (Vin+), a DC regulated power output port (Vout+), an energy storage battery pack access port (Vbat+), a common negative port (V-), a forward charge control IGBT (T-ci), a charge energy storage inductance (Lc), a charge freewheeling diode (D1), a discharge control IGBT (T-d), a discharge energy storage inductance (Ld), a discharge freewheeling diode (D2), an input-output pass-through and reverse isolation diode (D4), and an energy storage battery pack; the DC power output port (Vout+) is connected in series with a noise elimination circuit to provide a stable DC output; and the noise elimination circuit is connected in series with a differential amplifier to form a closed loop. a reference voltage output module connected to a differential amplifier; an input power supply connected to resistor R3, the reference voltage output module, and the PMOS power transistor; the reference voltage output module connected to the differential amplifier; the differential amplifier connected to an input terminal of the transient response enhancement circuit; an output terminal of the transient response enhancement circuit connected to the PMOS power transistor and the input terminal of the current sampling circuit; an output terminal of the current sampling circuit connected to resistor R1; and an output terminal of the PMOS power transistor connected to resistor R4; wherein the reference voltage output module generates a voltage using a bandgap reference circuit; the resistor R2 is grounded; and the differential amplifier is connected to resistor R1.

2. The anode of the input-output pass-through and reverse isolation diode (D4) and the collector of the forward charge control IGBT (T-ci) are respectively connected to a DC power generation power input port (Vin+), the cathode of the input-output pass-through and reverse isolation diode (D4) and the cathode of the discharge freewheel diode (D2) are respectively connected to a DC regulated power output port (Vout+), the emitter of the forward charge control IGBT (T-ci) is connected to the cathode of the charge freewheel diode (D1), the collector of the discharge control IGBT (T-d) is connected to the anode of the discharge freewheel diode (D2), and one end of the charge energy storage inductance (Lc) is connected to the forward charge control IGBT (T-ci) and the charge freewheel diode (D1). one end of the discharge energy storage inductance (Ld) is connected to a connection end of the discharge control IGBT (T-d) and the discharge freewheel diode (D2); the other end of the charge energy storage inductance (Lc), the other end of the discharge energy storage inductance (Ld) and the positive terminal of the energy storage battery pack are respectively connected to an energy storage battery pack access port (Vbat+); and the anode of the charge freewheel diode (D1), the negative terminal of the energy storage battery pack and the emitter of the discharge control IGBT (T-d) are respectively connected to a common negative port (V-).

3. The power supply further includes a reverse charge control IGBT (T-co), a first reverse charge isolation diode (D) and a second reverse charge isolation diode (D3), the second reverse charge isolation diode (D3) is connected in series to the connection line between the forward charge control IGBT (T-ci) and the charge freewheeling diode (D1), and the cathode of the second reverse charge isolation diode (D3) is connected to one end of the charge energy storage inductance (Lc), and the collector of the reverse charge control IGBT (T-co) is connected to the DC regulated power supply output port (Vout+ ), the emitter of the reverse charge control IGBT (T-co) is connected to the anode of a first reverse charge isolation diode (D), the cathode of the first reverse charge isolation diode (D) is connected to one end of a charge energy storage inductance (Lc), and the reverse charge control IGBT (T-co) and the first reverse charge isolation diode (D) together form a reverse independent charging circuit.

4. 3. The DC power conversion device for bridge-connecting new energy power generation, energy storage and microgrids according to claim 2, wherein the forward charge control IGBT (T-ci), the charge energy storage inductance (Lc) and the charge freewheel diode (D1) together constitute a buck step-down charging circuit, the discharge control IGBT (T-d), the discharge energy storage inductance (Ld) and the discharge freewheel diode (D2) together constitute a boost step-up discharging circuit, and the buck step-down charging circuit, the energy storage battery pack and the boost step-up discharging circuit together constitute an "H" type DC-B-DC circuit architecture.

5. 4. The DC power conversion device for bridge-connecting new energy power generation, energy storage, and microgrids according to claim 1, further comprising a high-frequency filtering capacitor and a low-frequency filtering electrolytic capacitor, the positive terminal of the low-frequency filtering electrolytic capacitor being connected to the energy storage battery pack access port (Vbat+), the negative terminal of the low-frequency filtering electrolytic capacitor being connected to the common negative port (V-), and both ends of the high-frequency filtering capacitor being connected in parallel to both ends of the low-frequency filtering electrolytic capacitor.

6. 4. The DC power conversion device for bridge-connecting new energy power generation, energy storage and microgrids according to claim 1, wherein the DC power input ports (Vin+), DC regulated power output ports (Vout+), energy storage battery pack access ports (Vbat+) and common negative port (V-) of a plurality of DC power conversion devices are connected in parallel in a one-to-one correspondence to realize a single-path power expansion function, wherein the energy storage battery packs connected to the energy storage battery pack access ports (Vbat+) are of the same type; the DC power input ports (Vin+), DC regulated power output ports (Vout+) and common negative port (V-) of the plurality of DC power conversion devices are connected in parallel in a one-to-one correspondence, and each energy storage battery pack access port (Vbat+) is independent to realize a capacity expansion function or a hybrid energy storage combined function, wherein the types of the energy storage battery packs connected to each energy storage battery pack access port (Vbat+) are all the same, partially the same, partially different or completely different.

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