Degaussing main power supply system based on lithium battery and super-capacity hybrid energy storage

Abstract

The invention relates to a degaussing main power supply system based on lithium battery and super-capacity hybrid energy storage, and belongs to the technical field of pulse power supplies. The system comprises a charger, a lithium battery BAT, a super capacitor SC and a chopping reversing device, the charger is respectively connected with the lithium battery BAT and the super capacitor SC and is used for charging the lithium battery BAT and the super capacitor SC; and the lithium battery BAT and the super capacitor SC are connected to the demagnetizing working coil through the chopping reversing device to output demagnetizing working current. The degaussing main power supply system is novel in structure, can give play to the advantages of high super-capacity power density and large lithium battery energy density, provides required working current for a high-power degaussing working coil, and is easy to popularize and apply.

Description

Technical Field

[0001] The invention belongs to the technical field of pulse power supplies, and in particular relates to a demagnetization main power supply system based on lithium batteries and supercapacitor hybrid energy storage. Background Art

[0002] Degaussing can reduce the threat of magnetic weapons to ships and improve the safety of ships entering and leaving bases, ports, sailing and operating in war zones. It has important military significance. For large ships, the power and energy requirements of the degaussing working coil are very large, especially in the rising and falling stages of current, the instantaneous power may be much greater than the continuous stage of current, which puts higher requirements on the design of the degaussing main power supply system.

[0003] Traditional degaussing main power supply usually uses AC power or diesel generator sets to provide energy. When the load power fluctuates greatly, it will impact the AC power or diesel generator sets, thus affecting the stability of system operation. For this reason, the degaussing main power supply should be equipped with energy storage devices. Currently, the more mature high-power energy storage devices include supercapacitors, flywheel energy storage, and lithium batteries.

[0004] The patent "A mobile pulse demagnetization working power supply with supercapacitor energy storage" adopts supercapacitor energy storage to solve the problem of high instantaneous power of the demagnetization coil, but the supercapacitor has low energy density and cannot meet the energy requirements of large demagnetization stations; the patent "A high-power pulse power supply system based on battery energy storage" adopts battery energy storage and step-down chopper circuit, taking advantage of the high energy density of the battery, it can meet the energy requirements of the low-inductance demagnetization coil, but it cannot provide sufficient instantaneous power and high voltage for the high-inductance demagnetization coil, nor can it absorb the energy of the large inductance feedback in the current reduction stage; In response to the above problems, the patent "A cyclic pulse high-power demagnetization main power supply system" adopts a step-up and step-down chopper circuit to increase the port voltage of the demagnetization coil, and additionally adds an energy dissipation device to absorb the energy of the large inductance load, but the step-up and step-down chopper circuit and The introduction of the energy dissipation device reduces the reliability of the system and greatly increases the project cost. The supercapacitor has a higher power density and is particularly suitable for short-term high-power applications with large inductance loads of the working coil. The lithium battery has a higher energy density and can make up for the lack of supercapacitor energy. It is used for long-term power supply during the continuous stage of large current of the working coil. If lithium batteries and supercapacitors can be used for hybrid energy storage, the advantages of high energy density of lithium batteries and high power density of supercapacitors can be brought into play. The power and energy requirements of large inductance demagnetization coils can be met. At the same time, supercapacitors can be used to replace energy dissipation devices to reduce system costs. However, there is currently no mature circuit topology that can achieve the above functions. Therefore, how to use a simple and reliable topology to design a lithium battery and supercapacitor hybrid energy storage demagnetization main power supply is an urgent problem to be solved in the field of pulse power supply technology. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the prior art and to provide a demagnetization main power supply system based on lithium batteries and super-capacitor hybrid energy storage.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A demagnetization main power supply system based on lithium battery and supercapacitor hybrid energy storage, including a charger, a lithium battery BAT, a supercapacitor SC and a chopper commutation device;

[0008] The charger is connected to the lithium battery BAT and the super-capacity SC respectively, and is used to charge the lithium battery BAT and the super-capacity SC;

[0009] The lithium battery BAT and supercapacitor SC are connected to the demagnetization working coil through the chopper commutation device to output the demagnetization working current;

[0010] In the current rising stage, the lithium battery BAT and the supercapacitor SC jointly provide the required high voltage and high current for the demagnetization working coil;

[0011] In the continuous current stage, the lithium battery BAT alone supplies power to the demagnetization working coil;

[0012] During the current drop phase, the magnetic field energy stored in the demagnetization working coil is fed back to the supercapacitor SC.

[0013] Further, preferably, the charger includes an AC EMC filter Z11, an LCL filter, a three-phase half-bridge conversion circuit, a DC support capacitor C2, and a DC EMC filter Z12;

[0014] The AC EMC filter Z11, the LCL filter, the three-phase half-bridge conversion circuit, the DC support capacitor C2, and the DC EMC filter Z12 are cascaded in sequence.

[0015] Further, preferably, the LCL filter includes an inductor L11, an inductor L12, an inductor L13, an inductor L21, an inductor L22, an inductor L23, a capacitor C11, a capacitor C12 and a capacitor C13;

[0016] The three-phase outputs of the AC EMC filter Z11 are respectively connected to one end of the inductor L11, one end of the inductor L12, and one end of the inductor L13;

[0017] The other end of the inductor L11 is connected to one end of the inductor L21, one end of the capacitor C11, and one end of the capacitor C13 respectively; the other end of the capacitor C11 is connected to one end of the capacitor C12;

[0018] The other end of the inductor L12 is connected to one end of the inductor L22 and one end of the capacitor C12 respectively;

[0019] The other end of the inductor L13 is respectively connected to one end of the inductor L23, the other end of the capacitor C12, and the other end of the capacitor C13;

[0020] The inductor L21, the inductor L22 and the inductor L23 are respectively connected to the three input terminals of the three-phase half-bridge conversion circuit.

[0021] Further, preferably, the output of the DC EMC filter Z12 is divided into two paths, one output load is a super capacitor SC, and the other output load is a lithium battery BAT.

[0022] Further, preferably, it further includes a current fuse F1, a current fuse F2, a thyristor TR1, a thyristor TR2, a thyristor TR3, a thyristor TR4, a resistor R1 and a switch KM3;

[0023] The first output terminal of the DC EMC filter Z12 is connected to the anode of the thyristor TR1 through the current fuse F1; the cathode of the thyristor TR1 is connected to one end of the resistor R1 and one end of the switch KM3 respectively; the other end of the resistor R1 and the other end of the switch KM3 are both connected to one end of the super capacitor SC;

[0024] The other end of the supercapacitor SC is connected to the anode of the thyristor TR2; the cathode of the thyristor TR2 is connected to the second output end of the DC EMC filter Z12 through the current fuse F2;

[0025] The anode of thyristor TR1 is also connected to the anode of thyristor TR3; the cathode of thyristor TR3 is connected to the positive electrode of lithium battery BAT, the negative electrode of lithium battery BAT is connected to the anode of thyristor TR4; the cathode of thyristor TR4 is connected to the cathode of thyristor TR2.

[0026] Further, preferably, the chopper commutation device includes an IGBT module S2, an IGBT module S31, an IGBT module S32, an IGBT module S33, an IGBT module S41, an IGBT module S42, an IGBT module S43, an IGBT module S51, an IGBT module S52, an IGBT module S53, a thyristor TH1, a thyristor TH21, a thyristor TH22, a thyristor TH23, a thyristor TH31, a thyristor TH32, a thyristor TH33, a thyristor TH34, an inductor L1, an inductor L2, an inductor L3, a diode D1 and a capacitor C1;

[0027] The negative electrode of the lithium battery BAT is connected to one end of the capacitor C1, the main emitter of the IGBT module S41, the main emitter of the IGBT module S42, the main emitter of the IGBT module S43, the cathode of the thyristor TH33, and the cathode of the thyristor TH34;

[0028] The positive electrode of the lithium battery BAT is connected to the positive electrode of the diode D1;

[0029] The cathode of the diode D1 is connected to the collector of the IGBT module S2 and the anode of the thyristor TH1 respectively;

[0030] The main emitter of the IGBT module S2 is connected to the negative electrode of the supercapacitor SC, the anode of the thyristor TH21, the anode of the thyristor TH22, and the anode of the thyristor TH23 respectively;

[0031] The positive electrode of the supercapacitor SC is respectively connected to the cathode of the thyristor TH1, the other end of the capacitor C1, the collector of the IGBT module S31, the collector of the IGBT module S32, and the collector of the IGBT module S33;

[0032] The main emitter of the IGBT module S31 is connected to the collector of the IGBT module S41 and the collector of the IGBT module S51 respectively;

[0033] The main emitter of the IGBT module S32 is connected to the collector of the IGBT module S42 and the collector of the IGBT module S52 respectively;

[0034] The main emitter of the IGBT module S33 is connected to the collector of the IGBT module S43 and the collector of the IGBT module S53 respectively;

[0035] The main emitter of the IGBT module S51 is connected to the cathode of the thyristor TH21 and one end of the inductor L1 respectively;

[0036] The main emitter of the IGBT module S52 is connected to the cathode of the thyristor TH22 and one end of the inductor L2 respectively;

[0037] The main emitter of the IGBT module S53 is connected to the cathode of the thyristor TH23 and one end of the inductor L3 respectively;

[0038] The other end of the inductor L1 is respectively connected to the other end of the inductor L2, the other end of the inductor L3, the anode of the thyristor TH31, and the anode of the thyristor TH32;

[0039] The cathode of the thyristor TH31 is connected to the anode of the thyristor TH33 and one end of the demagnetization working coil respectively;

[0040] The cathode of the thyristor TH32 is connected to the anode of the thyristor TH34 and the other end of the demagnetization working coil respectively.

[0041] The present invention Figure 1In the figure, the circuit breaker Q1 does not belong to the demagnetization main power supply system based on lithium battery and super-capacity hybrid energy storage of the present invention, and it is a circuit breaker used to control the work of the present invention; when the circuit breaker Q1 is disconnected, the demagnetization main power supply system based on lithium battery and super-capacity hybrid energy storage of the present invention does not work; when the circuit breaker Q1 is closed, the demagnetization main power supply system based on lithium battery and super-capacity hybrid energy storage of the present invention works.

[0042] The present invention considers that the supercapacitor has a higher power density, and is particularly suitable for short-term high-power applications with large inductive loads of the working coil, while the lithium battery has a higher energy density, which can make up for the lack of supercapacitor energy and be used for long-term power supply in the continuous stage of large current of the working coil. Therefore, a demagnetization main power supply system based on lithium battery and supercapacitor hybrid energy storage is designed. The power supply system can give full play to the advantages of high power density of supercapacitors and high energy density of lithium batteries, and at the same time, it can use 1 IGBT power module and 4 thyristors to achieve fast and reliable switching of circuit working modes, which is of great significance to the engineering of demagnetization power supply.

[0043] Those skilled in the art should know that the supercapacitor of the present invention is a supercapacitor, and the present invention does not make any special limitation on this.

[0044] The charger of the present invention adopts PWM rectification topology, and is composed of an AC EMC filter, an LCL filter, a three-phase half-bridge conversion circuit, a DC support capacitor, and a DC EMC filter cascaded. The charger output is divided into two paths, one output load is an ultra-capacitor, and the other output load is a lithium battery. Thyristors are respectively configured for the two outputs, and the two outputs are switched by thyristor switches.

[0045] The chopper commutation device of the present invention comprises a triple Buck chopper circuit, a thyristor commutation circuit, a diode, a thyristor and an IGBT module; the triple Buck chopper circuit is used to control the output current, and the thyristor commutation current can change the current direction of the working coil; the diode D1 and the IGBT module S2 realize the series connection of the lithium battery and the supercapacitor, which is used for power supply in the current rising stage; the thyristor TH1 can bypass the supercapacitor, which is used for power supply in the current continuous stage; the thyristors TH22, TH23 and TH24 provide a path for energy feedback of the working coil, which is used for reverse charging of the supercapacitor by the load in the current falling stage.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The present invention provides a degaussing main power supply system based on lithium battery and supercapacitor hybrid energy storage, which has a simple and novel structure and only requires one IGBT and four thyristors to realize the series connection and switching of supercapacitors and lithium batteries. The system has high reliability and can give full play to the advantages of high power density of supercapacitors and high energy density of lithium batteries, laying a solid foundation for the engineering application and promotion of hybrid energy storage degaussing power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the charger principle provided by an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of the principle of a chopper commutation device provided in an embodiment of the present invention;

[0050] Figure 3 An equivalent circuit diagram of a chopping commutation device in the current rising phase provided by an embodiment of the present invention;

[0051] Figure 4 An equivalent circuit diagram of a current continuous phase chopper commutation device provided by an embodiment of the present invention;

[0052] Figure 5 An equivalent circuit diagram of a chopper commutation device in the current falling phase provided by an embodiment of the present invention;

[0053] Figure 6 A current waveform diagram of a degaussing working coil provided for an application example of the present invention;

[0054] Figure 7 The voltage waveform diagram of the degaussing working coil provided for the application example of the present invention;

[0055] Figure 8 It is a structural schematic diagram of the demagnetization main power supply system based on lithium battery and super-capacitor hybrid energy storage of the present invention. DETAILED DESCRIPTION

[0056] The present invention is further described in detail below in conjunction with embodiments.

[0057] Those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific technology, connection relationship or condition is specified in the examples, the technology, connection relationship, condition described in the literature in the field or the product specification is used. If the manufacturer of the materials, instruments or equipment used is not specified, they are all conventional products that can be purchased.

[0058] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0059] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two. The terms "inside", "upper", "lower", etc., indicating positions or state relationships, are based on the positions or state relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting the present invention.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0061] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0062] Example 1

[0063] like Figure 1 , Figure 2 and Figure 8 As shown, a demagnetization main power supply system based on lithium battery and supercapacitor hybrid energy storage includes a charger, a lithium battery BAT, a supercapacitor SC and a chopper commutation device;

[0064] The charger is connected to the lithium battery BAT and the super-capacity SC respectively, and is used to charge the lithium battery BAT and the super-capacity SC;

[0065] The lithium battery BAT and supercapacitor SC are connected to the demagnetization working coil through the chopper commutation device to output the demagnetization working current;

[0066] In the current rising stage, the lithium battery BAT and the supercapacitor SC jointly provide the required high voltage and high current for the demagnetization working coil;

[0067] In the continuous current stage, the lithium battery BAT alone supplies power to the demagnetization working coil;

[0068] During the current drop phase, the magnetic field energy stored in the demagnetization working coil is fed back to the supercapacitor SC.

[0069] Example 2

[0070] like Figure 1 , Figure 2 and Figure 8 As shown, a demagnetization main power supply system based on lithium battery and supercapacitor hybrid energy storage includes a charger, a lithium battery BAT, a supercapacitor SC and a chopper commutation device;

[0071] The charger is connected to the lithium battery BAT and the super-capacity SC respectively, and is used to charge the lithium battery BAT and the super-capacity SC;

[0072] The lithium battery BAT and supercapacitor SC are connected to the demagnetization working coil through the chopper commutation device to output the demagnetization working current;

[0073] In the current rising stage, the lithium battery BAT and the supercapacitor SC jointly provide the required high voltage and high current for the demagnetization working coil;

[0074] In the continuous current stage, the lithium battery BAT alone supplies power to the demagnetization working coil;

[0075] During the current drop phase, the magnetic field energy stored in the demagnetization working coil is fed back to the supercapacitor SC.

[0076] The charger includes an AC EMC filter Z11, an LCL filter, a three-phase half-bridge conversion circuit, a DC support capacitor C2, and a DC EMC filter Z12;

[0077] The AC EMC filter Z11, the LCL filter, the three-phase half-bridge conversion circuit, the DC support capacitor C2, and the DC EMC filter Z12 are cascaded in sequence.

[0078] The chopper commutation device includes an IGBT module S2, an IGBT module S31, an IGBT module S32, an IGBT module S33, an IGBT module S41, an IGBT module S42, an IGBT module S43, an IGBT module S51, an IGBT module S52, an IGBT module S53, a thyristor TH1, a thyristor TH21, a thyristor TH22, a thyristor TH23, a thyristor TH31, a thyristor TH32, a thyristor TH33, a thyristor TH34, an inductor L1, an inductor L2, an inductor L3, a diode D1 and a capacitor C1;

[0079] The negative electrode of the lithium battery BAT is connected to one end of the capacitor C1, the main emitter of the IGBT module S41, the main emitter of the IGBT module S42, the main emitter of the IGBT module S43, the cathode of the thyristor TH33, and the cathode of the thyristor TH34;

[0080] The positive electrode of the lithium battery BAT is connected to the positive electrode of the diode D1;

[0081] The cathode of the diode D1 is connected to the collector of the IGBT module S2 and the anode of the thyristor TH1 respectively;

[0082] The main emitter of the IGBT module S2 is connected to the negative electrode of the supercapacitor SC, the anode of the thyristor TH21, the anode of the thyristor TH22, and the anode of the thyristor TH23 respectively;

[0083] The positive electrode of the supercapacitor SC is respectively connected to the cathode of the thyristor TH1, the other end of the capacitor C1, the collector of the IGBT module S31, the collector of the IGBT module S32, and the collector of the IGBT module S33;

[0084] The main emitter of the IGBT module S31 is connected to the collector of the IGBT module S41 and the collector of the IGBT module S51 respectively;

[0085] The main emitter of the IGBT module S32 is connected to the collector of the IGBT module S42 and the collector of the IGBT module S52 respectively;

[0086] The main emitter of the IGBT module S33 is connected to the collector of the IGBT module S43 and the collector of the IGBT module S53 respectively;

[0087] The main emitter of the IGBT module S51 is connected to the cathode of the thyristor TH21 and one end of the inductor L1 respectively;

[0088] The main emitter of the IGBT module S52 is connected to the cathode of the thyristor TH22 and one end of the inductor L2 respectively;

[0089] The main emitter of the IGBT module S53 is connected to the cathode of the thyristor TH23 and one end of the inductor L3 respectively;

[0090] The other end of the inductor L1 is respectively connected to the other end of the inductor L2, the other end of the inductor L3, the anode of the thyristor TH31, and the anode of the thyristor TH32;

[0091] The cathode of the thyristor TH31 is connected to the anode of the thyristor TH33 and one end of the demagnetization working coil respectively;

[0092] The cathode of the thyristor TH32 is connected to the anode of the thyristor TH34 and the other end of the demagnetization working coil respectively.

[0093] Example 3

[0094] like Figure 1 , Figure 2 and Figure 8 As shown, a demagnetization main power supply system based on lithium battery and supercapacitor hybrid energy storage includes a charger, a lithium battery BAT, a supercapacitor SC and a chopper commutation device;

[0095] The charger is connected to the lithium battery BAT and the super-capacity SC respectively, and is used to charge the lithium battery BAT and the super-capacity SC;

[0096] The lithium battery BAT and supercapacitor SC are connected to the demagnetization working coil through the chopper commutation device to output the demagnetization working current;

[0097] In the current rising stage, the lithium battery BAT and the supercapacitor SC jointly provide the required high voltage and high current for the demagnetization working coil;

[0098] In the continuous current stage, the lithium battery BAT alone supplies power to the demagnetization working coil;

[0099] During the current drop phase, the magnetic field energy stored in the demagnetization working coil is fed back to the supercapacitor SC.

[0100] The charger includes an AC EMC filter Z11, an LCL filter, a three-phase half-bridge conversion circuit, a DC support capacitor C2, and a DC EMC filter Z12;

[0101] The AC EMC filter Z11, the LCL filter, the three-phase half-bridge conversion circuit, the DC support capacitor C2, and the DC EMC filter Z12 are cascaded in sequence.

[0102] The three-phase half-bridge conversion circuit includes an IGBT module S11, an IGBT module S12, an IGBT module S13, an IGBT module S14, an IGBT module S15, and an IGBT module S16.

[0103] The LCL filter includes an inductor L11, an inductor L12, an inductor L13, an inductor L21, an inductor L22, an inductor L23, a capacitor C11, a capacitor C12 and a capacitor C13;

[0104] The three-phase outputs of the AC EMC filter Z11 are respectively connected to one end of the inductor L11, one end of the inductor L12, and one end of the inductor L13;

[0105] The other end of the inductor L11 is connected to one end of the inductor L21, one end of the capacitor C11, and one end of the capacitor C13 respectively; the other end of the capacitor C11 is connected to one end of the capacitor C12;

[0106] The other end of the inductor L12 is connected to one end of the inductor L22 and one end of the capacitor C12 respectively;

[0107] The other end of the inductor L13 is respectively connected to one end of the inductor L23, the other end of the capacitor C12, and the other end of the capacitor C13;

[0108] Inductor L21, inductor L22, and inductor L23 are respectively connected to three input terminals of the three-phase half-bridge conversion circuit;

[0109] The output of the DC EMC filter Z12 is divided into two paths, one output load is a supercapacitor SC, and the other output load is a lithium battery BAT.

[0110] The LCL filter includes an inductor L11, an inductor L12, an inductor L13, an inductor L21, an inductor L22, an inductor L23, a capacitor C11, a capacitor C12 and a capacitor C13;

[0111] The three-phase outputs of the AC EMC filter Z11 are respectively connected to one end of the inductor L11, one end of the inductor L12, and one end of the inductor L13;

[0112] The other end of the inductor L11 is connected to one end of the inductor L21, one end of the capacitor C11, and one end of the capacitor C13 respectively; the other end of the capacitor C11 is connected to one end of the capacitor C12;

[0113] The other end of the inductor L12 is connected to one end of the inductor L22 and one end of the capacitor C12 respectively;

[0114] The other end of the inductor L13 is respectively connected to one end of the inductor L23, the other end of the capacitor C12, and the other end of the capacitor C13;

[0115] Inductor L21, inductor L22, and inductor L23 are respectively connected to three input terminals of the three-phase half-bridge conversion circuit;

[0116] The three-phase half-bridge conversion circuit is connected in parallel with the DC support capacitor C2 and the DC EMC filter Z12;

[0117] The output of the DC EMC filter Z12 is divided into two paths, one output load is a supercapacitor SC, and the other output load is a lithium battery BAT.

[0118] The chopper commutation device includes an IGBT module S2, an IGBT module S31, an IGBT module S32, an IGBT module S33, an IGBT module S41, an IGBT module S42, an IGBT module S43, an IGBT module S51, an IGBT module S52, an IGBT module S53, a thyristor TH1, a thyristor TH21, a thyristor TH22, a thyristor TH23, a thyristor TH31, a thyristor TH32, a thyristor TH33, a thyristor TH34, an inductor L1, an inductor L2, an inductor L3, a diode D1 and a capacitor C1;

[0119] The negative electrode of the lithium battery BAT is connected to one end of the capacitor C1, the main emitter of the IGBT module S41, the main emitter of the IGBT module S42, the main emitter of the IGBT module S43, the cathode of the thyristor TH33, and the cathode of the thyristor TH34;

[0120] The positive electrode of the lithium battery BAT is connected to the positive electrode of the diode D1;

[0121] The cathode of the diode D1 is connected to the collector of the IGBT module S2 and the anode of the thyristor TH1 respectively;

[0122] The main emitter of the IGBT module S2 is connected to the negative electrode of the supercapacitor SC, the anode of the thyristor TH21, the anode of the thyristor TH22, and the anode of the thyristor TH23 respectively;

[0123] The positive electrode of the supercapacitor SC is respectively connected to the cathode of the thyristor TH1, the other end of the capacitor C1, the collector of the IGBT module S31, the collector of the IGBT module S32, and the collector of the IGBT module S33;

[0124] The main emitter of the IGBT module S31 is connected to the collector of the IGBT module S41 and the collector of the IGBT module S51 respectively;

[0125] The main emitter of the IGBT module S32 is connected to the collector of the IGBT module S42 and the collector of the IGBT module S52 respectively;

[0126] The main emitter of the IGBT module S33 is connected to the collector of the IGBT module S43 and the collector of the IGBT module S53 respectively;

[0127] The main emitter of the IGBT module S51 is connected to the cathode of the thyristor TH21 and one end of the inductor L1 respectively;

[0128] The main emitter of the IGBT module S52 is connected to the cathode of the thyristor TH22 and one end of the inductor L2 respectively;

[0129] The main emitter of the IGBT module S53 is connected to the cathode of the thyristor TH23 and one end of the inductor L3 respectively;

[0130] The other end of the inductor L1 is respectively connected to the other end of the inductor L2, the other end of the inductor L3, the anode of the thyristor TH31, and the anode of the thyristor TH32;

[0131] The cathode of the thyristor TH31 is connected to the anode of the thyristor TH33 and one end of the demagnetization working coil respectively;

[0132] The cathode of the thyristor TH32 is connected to the anode of the thyristor TH34 and the other end of the demagnetization working coil respectively.

[0133] Example 4

[0134] like Figure 1 , Figure 2 and Figure 8 As shown, a demagnetization main power supply system based on lithium battery and supercapacitor hybrid energy storage includes a charger, a lithium battery BAT, a supercapacitor SC and a chopper commutation device;

[0135] The charger is connected to the lithium battery BAT and the super-capacity SC respectively, and is used to charge the lithium battery BAT and the super-capacity SC;

[0136] The lithium battery BAT and supercapacitor SC are connected to the demagnetization working coil through the chopper commutation device to output the demagnetization working current;

[0137] In the current rising stage, the lithium battery BAT and the supercapacitor SC jointly provide the required high voltage and high current for the demagnetization working coil;

[0138] In the continuous current stage, the lithium battery BAT alone supplies power to the demagnetization working coil;

[0139] During the current drop phase, the magnetic field energy stored in the demagnetization working coil is fed back to the supercapacitor SC.

[0140] The charger includes an AC EMC filter Z11, an LCL filter, a three-phase half-bridge conversion circuit, a DC support capacitor C2, and a DC EMC filter Z12;

[0141] The AC EMC filter Z11, the LCL filter, the three-phase half-bridge conversion circuit, the DC support capacitor C2, and the DC EMC filter Z12 are cascaded in sequence.

[0142] The LCL filter includes an inductor L11, an inductor L12, an inductor L13, an inductor L21, an inductor L22, an inductor L23, a capacitor C11, a capacitor C12 and a capacitor C13;

[0143] The three-phase outputs of the AC EMC filter Z11 are respectively connected to one end of the inductor L11, one end of the inductor L12, and one end of the inductor L13;

[0144] The other end of the inductor L11 is connected to one end of the inductor L21, one end of the capacitor C11, and one end of the capacitor C13 respectively; the other end of the capacitor C11 is connected to one end of the capacitor C12;

[0145] The other end of the inductor L12 is connected to one end of the inductor L22 and one end of the capacitor C12 respectively;

[0146] The other end of the inductor L13 is respectively connected to one end of the inductor L23, the other end of the capacitor C12, and the other end of the capacitor C13;

[0147] Inductor L21, inductor L22, and inductor L23 are respectively connected to three input terminals of the three-phase half-bridge conversion circuit;

[0148] The output of the DC EMC filter Z12 is divided into two paths, one output load is a supercapacitor SC, and the other output load is a lithium battery BAT.

[0149] The LCL filter includes an inductor L11, an inductor L12, an inductor L13, an inductor L21, an inductor L22, an inductor L23, a capacitor C11, a capacitor C12 and a capacitor C13;

[0150] The three-phase outputs of the AC EMC filter Z11 are respectively connected to one end of the inductor L11, one end of the inductor L12, and one end of the inductor L13;

[0151] The other end of the inductor L11 is connected to one end of the inductor L21, one end of the capacitor C11, and one end of the capacitor C13 respectively; the other end of the capacitor C11 is connected to one end of the capacitor C12;

[0152] The other end of the inductor L12 is connected to one end of the inductor L22 and one end of the capacitor C12 respectively;

[0153] The other end of the inductor L13 is respectively connected to one end of the inductor L23, the other end of the capacitor C12, and the other end of the capacitor C13;

[0154] Inductor L21, inductor L22, and inductor L23 are respectively connected to three input terminals of the three-phase half-bridge conversion circuit;

[0155] The three-phase half-bridge conversion circuit is connected in parallel with the DC support capacitor C2 and the DC EMC filter Z12;

[0156] The output of the DC EMC filter Z12 is divided into two paths, one output load is a supercapacitor SC, and the other output load is a lithium battery BAT.

[0157] It also includes a current fuse F1, a current fuse F2, a thyristor TR1, a thyristor TR2, a thyristor TR3, a thyristor TR4, a resistor R1 and a switch KM3;

[0158] The first output terminal of the DC EMC filter Z12 is connected to the anode of the thyristor TR1 through the current fuse F1; the cathode of the thyristor TR1 is connected to one end of the resistor R1 and one end of the switch KM3 respectively; the other end of the resistor R1 and the other end of the switch KM3 are both connected to one end of the super capacitor SC;

[0159] The other end of the supercapacitor SC is connected to the anode of the thyristor TR2; the cathode of the thyristor TR2 is connected to the second output end of the DC EMC filter Z12 through the current fuse F2;

[0160] The anode of thyristor TR1 is also connected to the anode of thyristor TR3; the cathode of thyristor TR3 is connected to the positive electrode of lithium battery BAT, the negative electrode of lithium battery BAT is connected to the anode of thyristor TR4; the cathode of thyristor TR4 is connected to the cathode of thyristor TR2.

[0161] The chopper commutation device includes an IGBT module S2, an IGBT module S31, an IGBT module S32, an IGBT module S33, an IGBT module S41, an IGBT module S42, an IGBT module S43, an IGBT module S51, an IGBT module S52, an IGBT module S53, a thyristor TH1, a thyristor TH21, a thyristor TH22, a thyristor TH23, a thyristor TH31, a thyristor TH32, a thyristor TH33, a thyristor TH34, an inductor L1, an inductor L2, an inductor L3, a diode D1 and a capacitor C1;

[0162] The negative electrode of the lithium battery BAT is connected to one end of the capacitor C1, the main emitter of the IGBT module S41, the main emitter of the IGBT module S42, the main emitter of the IGBT module S43, the cathode of the thyristor TH33, and the cathode of the thyristor TH34;

[0163] The positive electrode of the lithium battery BAT is connected to the positive electrode of the diode D1;

[0164] The cathode of the diode D1 is connected to the collector of the IGBT module S2 and the anode of the thyristor TH1 respectively;

[0165] The main emitter of the IGBT module S2 is connected to the negative electrode of the supercapacitor SC, the anode of the thyristor TH21, the anode of the thyristor TH22, and the anode of the thyristor TH23 respectively;

[0166] The positive electrode of the supercapacitor SC is respectively connected to the cathode of the thyristor TH1, the other end of the capacitor C1, the collector of the IGBT module S31, the collector of the IGBT module S32, and the collector of the IGBT module S33;

[0167] The main emitter of the IGBT module S31 is connected to the collector of the IGBT module S41 and the collector of the IGBT module S51 respectively;

[0168] The main emitter of the IGBT module S32 is connected to the collector of the IGBT module S42 and the collector of the IGBT module S52 respectively;

[0169] The main emitter of the IGBT module S33 is connected to the collector of the IGBT module S43 and the collector of the IGBT module S53 respectively;

[0170] The main emitter of the IGBT module S51 is connected to the cathode of the thyristor TH21 and one end of the inductor L1 respectively;

[0171] The main emitter of the IGBT module S52 is connected to the cathode of the thyristor TH22 and one end of the inductor L2 respectively;

[0172] The main emitter of the IGBT module S53 is connected to the cathode of the thyristor TH23 and one end of the inductor L3 respectively;

[0173] The other end of the inductor L1 is respectively connected to the other end of the inductor L2, the other end of the inductor L3, the anode of the thyristor TH31, and the anode of the thyristor TH32;

[0174] The cathode of the thyristor TH31 is connected to the anode of the thyristor TH33 and one end of the demagnetization working coil respectively;

[0175] The cathode of the thyristor TH32 is connected to the anode of the thyristor TH34 and the other end of the demagnetization working coil respectively.

[0176] Application Example 1

[0177] Assuming that the resistance of the demagnetization working coil is 0.11Ω and the inductance is 0.3H, the demagnetization main power supply system based on lithium battery and super-capacitor hybrid energy storage of the present invention is adopted, the output power of the charger is DC560~1300V, the output power is 600kW, the nominal voltage of the lithium battery BAT is DC1075V, the maximum discharge power is 4500kW, the total capacitance of the super-capacitor SC is 13.89F, and the rated voltage is 1296V.

[0178] Through Simulink circuit simulation, the control method is as follows:

[0179] ① In the current rising stage, thyristor TH1 is turned off, thyristor TH21, thyristor TH22, and thyristor TH23 are turned off, and IGBT module S2 is turned on. The lithium battery BAT and supercapacitor SC are connected in series to output energy together. IGBT module S31, IGBT module S32, and IGBT module S33 work in PWM chopping mode, IGBT module S41, IGBT module S42, and IGBT module S43 are turned off, and IGBT module S51, IGBT module S52, and IGBT module S53 are turned on. When thyristor TH32 and thyristor TH33 are turned off, and thyristor TH31 and thyristor TH34 are turned on, the current of the demagnetization working coil is positive. At this time, the equivalent circuit is as follows Figure 3 shown.

[0180] ② In the current continuation stage, IGBT module S2 is turned off, thyristor TH21, thyristor TH22, and thyristor TH23 are turned off, thyristor TH1 is turned on, supercapacitor SC is bypassed, and energy is outputted solely by lithium battery BAT. Chopper IGBT module S31, IGBT module S32, and IGBT module S33 work in PWM chopping mode, IGBT module S41, IGBT module S42, and IGBT module S43 are turned off, and IGBT module S51, IGBT module S52, and IGBT module S53 are turned on. When thyristor TH32 and thyristor TH33 are turned off and thyristor TH31 and thyristor TH34 are turned on, the current of the demagnetization working coil is positive. At this time, the equivalent circuit is as follows: Figure 4 shown.

[0181] ③ During the current drop phase, turn off the IGBT module S2, turn off the IGBT module S31, IGBT module S32, IGBT module S33, turn off the IGBT module S41, IGBT module S42, IGBT module S43, turn off the IGBT module S51, thyristor S52, thyristor S53, thyristor TH32, thyristor TH33, turn off thyristor TH1, turn on thyristor TH21, thyristor TH22, thyristor TH23, demagnetize the working coil and the anti-parallel diodes of the IGBT modules S41, IGBT modules S42, IGBT modules S43, the anti-parallel diodes of the IGBT modules S31, IGBT modules S32, IGBT modules S33, the supercapacitor SC, and the thyristor TH 21. Thyristor TH22, thyristor TH23, inductor L1, inductor L2, inductor L3, thyristor TH31, thyristor TH34 form a current loop, and the energy stored in the demagnetization working coil and inductor L1, inductor L2, inductor L3 is released to the super capacitor SC to charge the super capacitor SC and prepare for the next pulse sequence rising stage. At this time, the equivalent circuit is as follows: Figure 5 shown.

[0182] Get the current and voltage waveforms of the demagnetization working coil as follows Figure 6and Figure 7 As shown, the simulation current accuracy is better than 1%, and the current rise time and fall time are both less than 1s, which meets the index requirements.

[0183] It should be noted that the working current of the demagnetization working coil is an alternating positive and negative waveform. When a positive pulse needs to be output, the control method is the same as shown in ①~③ above; when a negative pulse needs to be output, the difference between the control method and the above ①~③ is that the thyristors TH31 and TH34 are turned off, and the thyristors TH32 and TH33 are turned on, so that the working current can be reversed.

[0184] The topological structure proposed by the present invention is simple and reliable, and can realize the switching of lithium battery and supercapacitor power flow during the demagnetization process.

[0185] In summary, the demagnetization main power supply system based on lithium battery and ultra-capacitor hybrid energy storage proposed in the present invention can meet the power supply requirements of the demagnetization working coil.

[0186] It should be understood that parts not elaborated in detail in this specification belong to the prior art.

[0187] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A demagnetization main power supply system based on lithium battery and supercapacitor hybrid energy storage, characterized in that: Including charger, lithium battery BAT, supercapacitor SC and chopper commutation device; The charger is connected to the lithium battery BAT and the super-capacity SC respectively, and is used to charge the lithium battery BAT and the super-capacity SC; The lithium battery BAT and supercapacitor SC are connected to the demagnetization working coil through the chopper commutation device to output the demagnetization working current; In the current rising stage, the lithium battery BAT and the supercapacitor SC jointly provide the required high voltage and high current for the demagnetization working coil; In the continuous current stage, the lithium battery BAT alone supplies power to the demagnetization working coil; During the current drop phase, the magnetic field energy stored in the demagnetization working coil is fed back to the supercapacitor SC.

2. The demagnetization main power supply system based on lithium battery and ultra-capacitor hybrid energy storage according to claim 1 is characterized in that: The charger includes an AC EMC filter Z11, an LCL filter, a three-phase half-bridge conversion circuit, a DC support capacitor C2, and a DC EMC filter Z12; The AC EMC filter Z11, the LCL filter, the three-phase half-bridge conversion circuit, the DC support capacitor C2, and the DC EMC filter Z12 are cascaded in sequence.

3. The demagnetization main power supply system based on lithium battery and ultra-capacitor hybrid energy storage according to claim 2 is characterized in that: The LCL filter includes an inductor L11, an inductor L12, an inductor L13, an inductor L21, an inductor L22, an inductor L23, a capacitor C11, a capacitor C12 and a capacitor C13; The three-phase outputs of the AC EMC filter Z11 are respectively connected to one end of the inductor L11, one end of the inductor L12, and one end of the inductor L13; The other end of the inductor L11 is connected to one end of the inductor L21, one end of the capacitor C11, and one end of the capacitor C13 respectively; the other end of the capacitor C11 is connected to one end of the capacitor C12; The other end of the inductor L12 is connected to one end of the inductor L22 and one end of the capacitor C12 respectively; The other end of the inductor L13 is respectively connected to one end of the inductor L23, the other end of the capacitor C12, and the other end of the capacitor C13; The inductor L21, the inductor L22 and the inductor L23 are respectively connected to the three input terminals of the three-phase half-bridge conversion circuit.

4. The demagnetization main power supply system based on lithium battery and ultra-capacitor hybrid energy storage according to claim 2 is characterized in that: The output of the DC EMC filter Z12 is divided into two paths, one output load is a supercapacitor SC, and the other output load is a lithium battery BAT.

5. The demagnetization main power supply system based on lithium battery and ultra-capacitor hybrid energy storage according to claim 4 is characterized in that: It also includes a current fuse F1, a current fuse F2, a thyristor TR1, a thyristor TR2, a thyristor TR3, a thyristor TR4, a resistor R1 and a switch KM3; The first output terminal of the DC EMC filter Z12 is connected to the anode of the thyristor TR1 through the current fuse F1; the cathode of the thyristor TR1 is connected to one end of the resistor R1 and one end of the switch KM3 respectively; the other end of the resistor R1 and the other end of the switch KM3 are both connected to one end of the super capacitor SC; The other end of the supercapacitor SC is connected to the anode of the thyristor TR2; the cathode of the thyristor TR2 is connected to the second output end of the DC EMC filter Z12 through the current fuse F2; The anode of thyristor TR1 is also connected to the anode of thyristor TR3; the cathode of thyristor TR3 is connected to the positive electrode of lithium battery BAT, the negative electrode of lithium battery BAT is connected to the anode of thyristor TR4; the cathode of thyristor TR4 is connected to the cathode of thyristor TR2.

6. The demagnetization main power supply system based on lithium battery and ultra-capacitor hybrid energy storage according to claim 1 is characterized in that: The chopper commutation device includes an IGBT module S2, an IGBT module S31, an IGBT module S32, an IGBT module S33, an IGBT module S41, an IGBT module S42, an IGBT module S43, an IGBT module S51, an IGBT module S52, an IGBT module S53, a thyristor TH1, a thyristor TH21, a thyristor TH22, a thyristor TH23, a thyristor TH31, a thyristor TH32, a thyristor TH33, a thyristor TH34, an inductor L1, an inductor L2, an inductor L3, a diode D1 and a capacitor C1; The negative electrode of the lithium battery BAT is connected to one end of the capacitor C1, the main emitter of the IGBT module S41, the main emitter of the IGBT module S42, the main emitter of the IGBT module S43, the cathode of the thyristor TH33, and the cathode of the thyristor TH34; The positive electrode of the lithium battery BAT is connected to the positive electrode of the diode D1; The cathode of the diode D1 is connected to the collector of the IGBT module S2 and the anode of the thyristor TH1 respectively; The main emitter of the IGBT module S2 is connected to the negative electrode of the supercapacitor SC, the anode of the thyristor TH21, the anode of the thyristor TH22, and the anode of the thyristor TH23 respectively; The positive electrode of the supercapacitor SC is respectively connected to the cathode of the thyristor TH1, the other end of the capacitor C1, the collector of the IGBT module S31, the collector of the IGBT module S32, and the collector of the IGBT module S33; The main emitter of the IGBT module S31 is connected to the collector of the IGBT module S41 and the collector of the IGBT module S51 respectively; The main emitter of the IGBT module S32 is connected to the collector of the IGBT module S42 and the collector of the IGBT module S52 respectively; The main emitter of the IGBT module S33 is connected to the collector of the IGBT module S43 and the collector of the IGBT module S53 respectively; The main emitter of the IGBT module S51 is connected to the cathode of the thyristor TH21 and one end of the inductor L1 respectively; The main emitter of the IGBT module S52 is connected to the cathode of the thyristor TH22 and one end of the inductor L2 respectively; The main emitter of the IGBT module S53 is connected to the cathode of the thyristor TH23 and one end of the inductor L3 respectively; The other end of the inductor L1 is respectively connected to the other end of the inductor L2, the other end of the inductor L3, the anode of the thyristor TH31, and the anode of the thyristor TH32; The cathode of the thyristor TH31 is connected to the anode of the thyristor TH33 and one end of the demagnetization working coil respectively; The cathode of the thyristor TH32 is connected to the anode of the thyristor TH34 and the other end of the demagnetization working coil respectively.

Images