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

Abstract

The utility model 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 utility model belongs to the technical field of pulse power supply, concretely relates to a demagnetization main power supply system based on lithium battery and super capacitor hybrid energy storage. BACKGROUND

[0002] Demagnetization can reduce the threat of ships suffering from magnetic weapons, improve the safety of ships entering and leaving bases, ports, navigation and activities in the war zone, and has important military significance. For large ships, the power and energy demand of the demagnetization work coil is very large, especially in the current rising and falling stage, the instantaneous power may be much larger than that in the current continuous stage, which puts higher requirements on the design of the demagnetization main power supply system.

[0003] The traditional demagnetization main power supply usually uses commercial power or diesel generator set to provide energy. When the load power fluctuates greatly, it will impact the commercial power or diesel generator set, thereby affecting the system operation stability. Therefore, the demagnetization main power supply should be equipped with energy storage devices. The current mature high-power energy storage devices include super capacitor, flywheel energy storage and lithium battery.

[0004] The patent "Mobile pulse demagnetization work power supply with super capacitor energy storage" uses super capacitor energy storage to solve the problem of large instantaneous power of demagnetization coil, but the energy density of super capacitor is low, which cannot meet the energy demand of large demagnetization station; The patent "High-power pulse power supply system based on battery energy storage" uses battery energy storage and step-down chopper circuit to take advantage of the high energy density of the battery, which can meet the energy demand of low-inductance demagnetization coil, but it cannot provide enough instantaneous power and high voltage for large inductance demagnetization coil, and it cannot absorb the energy feedback of large inductance in the current falling stage; In view of the above problems, the patent "Circulating pulse high-power demagnetization main power supply system" uses a step-up and step-down chopper circuit to increase the port voltage of the demagnetization coil, and additionally increases the energy dissipation device to absorb the energy of the large inductance load, but the introduction of the step-up and step-down chopper circuit and the energy dissipation device reduces the reliability of the system, and also greatly increases the engineering cost; Super capacitor has high power density, especially suitable for short-time high-power application occasions of large inductance work coil, while lithium battery has high energy density, which can make up for the lack of super capacitor energy, and is used for long-time power supply in the large current continuous stage of the work coil. If lithium battery and super capacitor hybrid energy storage can be used to take advantage of the high energy density of lithium battery and the high power density of super capacitor, the power and energy demand of large inductance demagnetization coil can be met, and super capacitor can be used to replace the energy dissipation device to reduce the system cost, but there is no mature circuit topology that can realize the above functions at present. Therefore, how to use a simple and reliable topology structure to design a lithium battery and super capacitor hybrid energy storage type demagnetization main power supply is a problem that needs to be solved in the field of pulse power supply technology at present. UTILITY MODEL CONTENTS

[0005] The utility model discloses a purpose is to solve the prior art's insufficient, provide a kind of based on lithium battery and super capacity hybrid energy storage's demagnetization main power system.

[0006] To achieve the above object, the utility model adopts the technical scheme as follows:

[0007] A kind of based on lithium battery and super capacity hybrid energy storage's demagnetization main power system, including charger, lithium battery BAT, super capacity SC and chopper commutating device;

[0008] Charger is connected with lithium battery BAT, super capacity SC respectively, for charging lithium battery BAT, super capacity SC;

[0009] Lithium battery BAT, super capacity SC are all connected by chopper commutating device and access demagnetization work coil, output demagnetization working current;

[0010] In current rising stage, lithium battery BAT and super capacity SC are collectively required high voltage and large current for demagnetization work coil;

[0011] In current sustained stage, lithium battery BAT is individually powered for demagnetization work coil;

[0012] In current falling stage, the magnetic field energy stored in demagnetization work coil is fed back to super capacity SC.

[0013] Further, preferably, charger includes alternating current EMC filter Z11, LCL filter, three-phase half-bridge conversion circuit, direct current support capacitor C2, direct current EMC filter Z12;

[0014] Alternating current EMC filter Z11, LCL filter, three-phase half-bridge conversion circuit, direct current support capacitor C2, direct current EMC filter Z12 are cascaded in turn.

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

[0016] The three-phase output of alternating current EMC filter Z11 is connected with one end of inductance L11, one end of inductance L12 and one end of inductance L13 respectively;

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

[0018] The other end of inductance L12 is connected with one end of inductance L22 and one end of capacitor C12 respectively;

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

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

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

[0022] Further, preferably, the current fuse F1, the current fuse F2, the thyristor TR1, the thyristor TR2, the thyristor TR3, the thyristor TR4, the resistor R1 and the switch KM3 are further included.

[0023] The first output end of the DC EMC filter Z12 is connected with the anode of the thyristor TR1 through the current fuse F1; the cathode of the thyristor TR1 is connected with 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 with one end of the super capacitor SC.

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

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

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

[0027] The negative electrode of the lithium battery BAT is connected with 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 with the positive electrode of the diode D1.

[0029] The negative pole of the diode D1 is connected with 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 with the negative pole of the super capacitor SC, the anode of the thyristor TH21, the anode of the thyristor TH22, the anode of the thyristor TH23 respectively;

[0031] The positive pole of the super capacitor SC is connected with the negative pole 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, the collector of the IGBT module S33 respectively;

[0032] The main emitter of the IGBT module S31 is connected with 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 with 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 with 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 with the negative pole of the thyristor TH21 and one end of the inductor L1 respectively;

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

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

[0038] The other end of the inductor L1 is connected with 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 respectively;

[0039] The negative pole of the thyristor TH31 is connected with the anode of the thyristor TH33 and one end of the degauss working coil respectively;

[0040] The negative pole of the thyristor TH32 is connected with the anode of the thyristor TH34 and the other end of the degauss working coil respectively.

[0041] The utility model Figure 1The circuit breaker Q1 does not belong to the demagnetizing main power supply system based on lithium battery and super capacitor hybrid energy storage, and is a circuit breaker for controlling whether the demagnetizing main power supply system based on lithium battery and super capacitor hybrid energy storage can work; when the circuit breaker Q1 is disconnected, the demagnetizing main power supply system based on lithium battery and super capacitor hybrid energy storage does not work; when the circuit breaker Q1 is closed, the demagnetizing main power supply system based on lithium battery and super capacitor hybrid energy storage works.

[0042] The super capacitor has high power density, and is especially suitable for short-time high-power application occasions of a large inductance load of a working coil; the lithium battery has high energy density, and can make up for the insufficient energy of the super capacitor, and is used for long-time power supply in a large-current continuous stage of the working coil, therefore, the demagnetizing main power supply system based on lithium battery and super capacitor hybrid energy storage is designed.

[0043] The super capacitor of the utility model is a super capacitor, and the utility model does not specially limit this.

[0044] The charger adopts a PWM rectification topology, is formed by cascading an alternating current EMC filter, an LCL filter, a three-phase half-bridge conversion circuit, a direct current support capacitor and a direct current EMC filter, and is divided into two output paths; one output path is used for outputting a super capacitor load, and the other output path is used for outputting a lithium battery load; the two output paths are respectively configured with thyristors, and switching of the two output paths is realized through the thyristors.

[0045] The chopper commutation device 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 for controlling output current; the thyristor commutation circuit can change the current direction of the working coil; the diode D1 and the IGBT module S2 realize series connection of the lithium battery and the super capacitor, and are used for power supply in a current rising stage; the thyristor TH1 can bypass the super capacitor, and is used for power supply in a current continuous stage; the thyristors TH22, TH22 and TH23 provide a path for energy feedback of the working coil, and are used for reverse charging of the super capacitor by a load in a current falling stage.

[0046] Compared with the prior art, the utility model has the beneficial effects that:

[0047] The utility model provides a kind of based on lithium battery and super capacity mixed energy storage's degaussing main power supply system, simple and novel structure, only 1 IGBT and 4 thyristors can realize the series connection and switching of super capacitor and lithium battery, system reliability is high, can exert the advantage of high super capacity power density and lithium battery energy density, lay solid foundation for the engineering application promotion of mixed energy storage degaussing power supply. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 The charging machine principle schematic diagram provided for the utility model embodiment is provided;

[0049] Figure 2 The chopper commutating device principle schematic diagram provided for the utility model embodiment is provided;

[0050] Figure 3 The chopper commutating device equivalent circuit diagram provided for the utility model embodiment in current rising stage is provided;

[0051] Figure 4 The chopper commutating device equivalent circuit diagram provided for the utility model embodiment in current sustaining stage is provided;

[0052] Figure 5 The chopper commutating device equivalent circuit diagram provided for the utility model embodiment in current falling stage is provided;

[0053] Figure 6 The degaussing work coil current waveform diagram provided for the utility model application example is provided;

[0054] Figure 7 The degaussing work coil voltage waveform diagram provided for the utility model application example is provided;

[0055] Figure 8 The structure schematic diagram of the degaussing main power supply system based on lithium battery and super capacity mixed energy storage of the utility model is provided. DETAILED DESCRIPTION

[0056] The utility model is further described in detail in connection with embodiment.

[0057] Those skilled in the art will understand that the following examples are only for illustrating the utility model, and should not be regarded as limiting the scope of the utility model. In the embodiment, the specific technology, connection relationship or condition not noted is carried out according to the technology, connection relationship, condition described in the literature in the art or according to product instruction. The material, instrument or equipment not noted manufacturer is all conventional product that can be obtained by purchase.

[0058] As will be understood by persons skilled in the art of the present technology, the singular forms "a," "an," "said," and "the" include plural referents unless the context clearly dictates otherwise. It is further understood that the terms "comprise" and "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It is understood that when we refer to an element being "connected" to another element, it can be directly connected to the other element, or intervening elements can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0059] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. The orientations or positional relationships indicated by the terms such as "inner," "upper," "lower," and the like are based on the orientations or positional relationships shown in the drawings, and are for the purpose of facilitating the description and simplifying the description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0060] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "provided with" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For persons skilled in the art, the specific meanings of the above terms in the present application should be understood according to the specific circumstances.

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

[0062] Embodiment 1

[0063] As shown in Figure 1 , Figure 2 and Figure 8 , a demagnetization main power supply system based on lithium battery and super-capacitor hybrid energy storage includes a charger, a lithium battery BAT, a super-capacitor SC, and a chopping commutation device;

[0064] The charger is connected with the lithium battery BAT and the super-capacitor SC respectively, and is used for charging the lithium battery BAT and the super-capacitor SC.

[0065] The lithium battery BAT and the super capacitor SC are connected to the demagnetization working coil through the chopping commutation device to output demagnetization working current.

[0066] In the current rising phase, the lithium battery BAT and the super capacitor SC jointly provide the required high voltage and large current for the demagnetization working coil.

[0067] In the current sustaining phase, the lithium battery BAT alone supplies power to the demagnetization working coil.

[0068] In the current falling phase, the magnetic field energy stored in the demagnetization working coil is fed back to the super capacitor SC.

[0069] Embodiment 2

[0070] As shown in Figure 1 , Figure 2 and Figure 8 , a demagnetization main power supply system based on lithium battery and super capacitor hybrid energy storage includes a charger, a lithium battery BAT, a super capacitor SC, and a chopping commutation device.

[0071] The charger is connected to the lithium battery BAT and the super capacitor SC respectively, and is used to charge the lithium battery BAT and the super capacitor SC.

[0072] The lithium battery BAT and the super capacitor SC are connected to the demagnetization working coil through the chopping commutation device to output demagnetization working current.

[0073] In the current rising phase, the lithium battery BAT and the super capacitor SC jointly provide the required high voltage and large current for the demagnetization working coil.

[0074] In the current sustaining phase, the lithium battery BAT alone supplies power to the demagnetization working coil.

[0075] In the current falling phase, the magnetic field energy stored in the demagnetization working coil is fed back to the super capacitor SC.

[0076] The charger includes an alternating current EMC filter Z11, an LCL filter, a three-phase half-bridge conversion circuit, a direct current support capacitor C2, and a direct current EMC filter Z12.

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

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

[0079] The negative electrode of the lithium battery BAT is connected with 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 with the anode of the diode D1;

[0081] The cathode of the diode D1 is connected with 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 with the negative electrode of the super capacitor 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 super capacitor SC is connected with 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 respectively;

[0084] The main emitter of the IGBT module S31 is connected with 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 with 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 with 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 with 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 with 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 with the cathode of the thyristor TH23 and one end of the inductor L3 respectively;

[0090] The other end of the inductor L1 is connected with 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 respectively;

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

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

[0093] Embodiment 3

[0094] As shown in Figure 1 , Figure 2 and Figure 8 , a degaussing main power supply system based on lithium batteries and super-capacitor hybrid energy storage includes a charger, lithium batteries BAT, super-capacitors SC and a chopping commutation device;

[0095] The charger is connected with the lithium batteries BAT and the super-capacitors SC, and is used for charging the lithium batteries BAT and the super-capacitors SC;

[0096] The lithium batteries BAT and the super-capacitors SC are connected with the degaussing working coil through the chopping commutation device, and output a degaussing working current;

[0097] In the current rising phase, the lithium batteries BAT and the super-capacitors SC jointly provide the degaussing working coil with required high voltage and large current;

[0098] In the current sustaining phase, the lithium batteries BAT alone supplies power to the degaussing working coil;

[0099] In the current falling phase, the magnetic field energy stored in the degaussing working coil is fed back to the super-capacitors SC.

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

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

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

[0103] The LCL filter comprises 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 output of the alternating-current EMC filter Z11 is connected to one end of the inductor L11, one end of the inductor L12 and one end of the inductor L13 respectively;

[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; and 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 connected to one end of the inductor L23, the other end of the capacitor C12 and the other end of the capacitor C13 respectively;

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

[0109] The output of the direct-current EMC filter Z12 is divided into two paths, one of which is used to load a super capacitor SC and the other of which is used to load a lithium battery BAT.

[0110] The LCL filter comprises 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 output of the alternating-current EMC filter Z11 is connected to one end of the inductor L11, one end of the inductor L12 and one end of the inductor L13 respectively;

[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; and 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 connected to one end of the inductor L23, the other end of the capacitor C12 and the other end of the capacitor C13 respectively;

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

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

[0117] The direct current EMC filter Z12 is outputted in two ways, one way is to load the super capacitor SC, and the other way is to load the lithium battery BAT.

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

[0119] The negative electrode of the lithium battery BAT is connected with 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 with the anode of the diode D1.

[0121] The cathode of the diode D1 is connected with 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 with the negative electrode of the super capacitor 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 super capacitor SC is connected with 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 respectively.

[0124] The main emitter of the IGBT module S31 is connected with 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 with 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 with 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 with 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 with 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 with the cathode of the thyristor TH23 and one end of the inductor L3 respectively;

[0130] The other end of the inductor L1 is connected with 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 respectively;

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

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

[0133] Embodiment 4

[0134] As shown in Figure 1 , Figure 2 and Figure 8 , a degauss main power supply system based on lithium battery and super capacitor hybrid energy storage includes a charger, a lithium battery BAT, a super capacitor SC and a chopping commutation device;

[0135] The charger is 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;

[0136] The lithium battery BAT and the super capacitor SC are connected with the degauss working coil through the chopping commutation device, and output a degauss working current;

[0137] In the current rising stage, the degauss working coil is provided with required high voltage and large current by the lithium battery BAT and the super capacitor SC together;

[0138] In the current sustaining stage, the degauss working coil is powered by the lithium battery BAT alone;

[0139] In the current falling stage, the magnetic field energy stored in the degauss working coil is fed back to the super capacitor SC.

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

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

[0142] The LCL filter comprises 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 output of the alternating-current EMC filter Z11 is connected to one end of the inductor L11, one end of the inductor L12 and one end of the inductor L13 respectively;

[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 connected to one end of the inductor L23, the other end of the capacitor C12 and the other end of the capacitor C13 respectively;

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

[0148] The output of the direct-current EMC filter Z12 is divided into two paths, one path is used to output the super capacitor SC, and the other path is used to output the lithium battery BAT.

[0149] The LCL filter comprises 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 output of the alternating-current EMC filter Z11 is connected to one end of the inductor L11, one end of the inductor L12 and one end of the inductor L13 respectively;

[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 connected to one end of the inductor L23, the other end of the capacitor C12 and the other end of the capacitor C13 respectively;

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

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

[0156] The output of the direct current EMC filter Z12 is divided into two paths, one of which is loaded with the super capacitor SC and the other of which is loaded with the lithium battery BAT.

[0157] The current fuse F1, the current fuse F2, the thyristor TR1, the thyristor TR2, the thyristor TR3, the thyristor TR4, the resistor R1 and the switch KM3 are further included.

[0158] The first output end of the direct current EMC filter Z12 is connected with the anode of the thyristor TR1 through the current fuse F1; the cathode of the thyristor TR1 is connected with 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 with one end of the super capacitor SC.

[0159] The other end of the super capacitor SC is connected with the anode of the thyristor TR2; the cathode of the thyristor TR2 is connected with the second output end of the direct current EMC filter Z12 through the current fuse F2.

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

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

[0162] The negative electrode of the lithium battery BAT is connected with 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 with the positive electrode of the diode D1.

[0164] The negative electrode of the diode D1 is connected with 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 with the negative electrode of the super capacitor 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 super capacitor SC is connected with 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 respectively;

[0167] The main emitter of the IGBT module S31 is connected with 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 with 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 with 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 with 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 with 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 with the cathode of the thyristor TH23 and one end of the inductor L3 respectively;

[0173] The other end of the inductor L1 is connected with 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 respectively;

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

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

[0176] Application Example 1

[0177] Suppose that the resistance of the degauss working coil is 0.11Ω, the inductance is 0.3H, the output power of the charger is DC 560-1300V, the output power is 600kW, the nominal voltage of the lithium battery BAT is DC 1075V, the maximum discharge power is 4500kW, the total capacity of the super capacitor SC is 13.89F, and the rated voltage is 1296V.

[0178] The circuit simulation is carried out through Simulink, and the control mode is as follows:

[0179] ① Current rising stage, turn off thyristor TH1, turn off thyristor TH21, thyristor TH22, thyristor TH23, turn on IGBT module S2, lithium battery BAT and super capacitor SC are in series, and output energy together. IGBT module S31, IGBT module S32, IGBT module S33 work in PWM mode, IGBT module S41, IGBT module S42, IGBT module S43 are turned off, and IGBT module S51, IGBT module S52, IGBT module S53 are turned on. When thyristor TH32, thyristor TH33 are turned off, and thyristor TH31, thyristor TH34 are turned on, the current of the demagnetizing working coil is positive, and the equivalent circuit is shown in Figure 3 .

[0180] ② Current maintaining stage, turn off IGBT module S2, turn off thyristor TH21, thyristor TH22, thyristor TH23, turn on thyristor TH1, bypass super capacitor SC, and output energy by lithium battery BAT alone. Chopper IGBT module S31, IGBT module S32, IGBT module S33 work in PWM mode, IGBT module S41, IGBT module S42, IGBT module S43 are turned off, and IGBT module S51, IGBT module S52, IGBT module S53 are turned on. When thyristor TH32, thyristor TH33 are turned off, and thyristor TH31, thyristor TH34 are turned on, the current of the demagnetizing working coil is positive, and the equivalent circuit is shown in Figure 4 .

[0181] ③ Current falling stage, turn off IGBT module S2, turn off IGBT module S31, IGBT module S32, IGBT module S33, turn off IGBT module S41, IGBT module S42, IGBT module S43, turn off IGBT module S51, IGBT module S52, IGBT module S53, turn off thyristor TH32, thyristor TH33, turn off thyristor TH1, turn on thyristor TH21, thyristor TH22, thyristor TH23, the demagnetizing working coil and the anti-parallel diodes of IGBT module S41, IGBT module S42, IGBT module S43, the anti-parallel diodes of IGBT module S31, IGBT module S32, IGBT module S33, super capacitor SC, thyristor TH21, thyristor TH22, thyristor TH23, inductance L1, inductance L2, inductance L3, thyristor TH31, thyristor TH34 form a current loop, the energy stored in the demagnetizing working coil and inductance L1, inductance L2, inductance L3 is released to super capacitor SC, and super capacitor SC is charged for the next pulse sequence rising stage, and the equivalent circuit is shown in Figure 5 .

[0182] The demagnetizing working coil current and voltage waveforms are shown in Figure 6and Figure 7 As shown in the simulation results, the simulation current accuracy is better than 1%, the current rise time and fall time are not greater than 1s, and the index requirements are met.

[0183] It should be noted that the working current of the demagnetizing working coil is a positive and negative alternating waveform, when a positive pulse is needed to be output, the control mode is as shown in ①-③ above, when a negative pulse is needed to be output, the difference between the control mode and ①-③ above is that the thyristors TH31 and TH34 are turned off and the thyristors TH32 and TH33 are turned on, that is, the working current is reversely conducted.

[0184] The demagnetizing main power supply system based on lithium battery and super-capacitor hybrid energy storage provided by the utility model has simple and reliable topological structure and can realize switching of lithium battery and super-capacitor power flow in the demagnetizing process.

[0185] In conclusion, the demagnetizing main power supply system based on lithium battery and super-capacitor hybrid energy storage provided by the utility model can meet the power supply demand of the demagnetizing working coil.

[0186] It should be understood that the parts not elaborated in the specification are all prior art.

[0187] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, and the utility model can have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A demagnetization main power supply system based on lithium batteries and super-capacitor hybrid energy storage, characterized in that, The charger, the lithium battery BAT, the super capacitor SC and the chopping commutating device are included. The charger is connected with the lithium battery BAT and the super capacitor SC respectively, and is used for charging the lithium battery BAT and the super capacitor SC. The lithium battery BAT and the super capacitor SC are connected with the demagnetizing working coil through the chopping commutating device, and output the demagnetizing working current. In the current rising stage, the lithium battery BAT and the super capacitor SC jointly provide the required high voltage and large current for the demagnetizing working coil. In the current sustaining stage, the lithium battery BAT alone supplies power for the demagnetizing working coil. In the current falling stage, the magnetic field energy stored in the demagnetizing working coil is fed back to the super capacitor SC.

2. The demagnetization main power supply system based on lithium battery and super-capacitor hybrid energy storage according to claim 1, characterized in that, The charger includes the alternating current EMC filter Z11, the LCL filter, the three-phase half-bridge conversion circuit, the direct current support capacitor C2 and the direct current EMC filter Z12. The alternating current EMC filter Z11, the LCL filter, the three-phase half-bridge conversion circuit, the direct current support capacitor C2 and the direct current EMC filter Z12 are cascaded in sequence.

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

4. The demagnetization main power supply system based on lithium battery and super-capacitor hybrid energy storage according to claim 2, characterized in that, The output of the direct current EMC filter Z12 is divided into two paths, one path is used for the super capacitor SC, and the other path is used for the lithium battery BAT.

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

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

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