CN114825930B - Three-port converter suitable for satellite power supply double-bus architecture and control method - Google Patents
Three-port converter suitable for satellite power supply double-bus architecture and control method Download PDFInfo
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- CN114825930B CN114825930B CN202210302381.3A CN202210302381A CN114825930B CN 114825930 B CN114825930 B CN 114825930B CN 202210302381 A CN202210302381 A CN 202210302381A CN 114825930 B CN114825930 B CN 114825930B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention is suitable for the technical improvement field of satellites, and provides a three-port converter suitable for a satellite power supply double-bus architecture, which not only can realize the power conversion of a solar cell array and two buses, but also can send partial power stored by solar energy and a storage battery pack at one bus end into the other bus when the input power is insufficient at the end of the service life or a certain bus is in fault, and comprises a solar cell array port,PLV bus Port and method of making sameV bus Port, the solar cell array is connected to the solar cell arrayPLV bus Ports are in a boost conversion relationship, and the solar cell array ports are connected with the solar cell arrayV bus Port buck conversion relationship. The power density is high, the dynamic response speed is high, the current of each port is continuous, and the reliability of the satellite power supply platform is improved.
Description
Technical Field
The invention belongs to the technical improvement field of satellites, and particularly relates to a three-port converter suitable for a satellite power supply double-bus architecture and a control method.
Background
Currently, in the field of industrial products such as distributed photovoltaic power generation systems and hybrid energy storage systems, a modularized Three-Port Converter (TPC) has been widely studied and applied. The three-port converter power functions based on the above background include: the MPPT control of the solar cell array end is realized; (2) realizing charge and discharge control of the storage battery; (3) the load can be stably and reliably supplied with power. According to the above functional requirements, the power flow direction inside the converter is shown in fig. 1, and the corresponding working modes are respectively: (1) In the single-input double-output mode, when the output power of the solar cell array of the detector is sufficient, the three-port converter supplies power for a load and simultaneously charges a storage battery; (2) In the double-input single-output mode, when the output power of the solar cell array of the detector is insufficient, the three-port converter discharges a storage battery and supplies the sailboard power and the battery power to a load end together; (3) In the single-input single-output mode, when the solar cell array of the detector has no output power, the three-port converter discharges the storage battery and independently supplies the battery power to the load end, as shown in fig. 1.
The satellite power system also comprises a solar cell array, a storage battery pack and a load end, and is similar to the application condition of the traditional photovoltaic power generation system. However, along with the development trend of diversification of space load types and complicating of working modes, a double-bus architecture gradually emerges, namely a solar cell array, a storage battery pack and a power supply controller are divided into two independent groups according to power requirements, and one group supplies power for a stable load of a platform, namely Vbus; the other group is used for supplying power to the strong disturbance load such as the electric propulsion engine, namely the PLVbus, and the corresponding power supply platform architecture is shown in figure 2. If two buses are independent of each other in the double-bus architecture, the reliability of the power supply platform is poor, meanwhile, as the sailboard function declines at the end of the service life of the satellite, the input power of the source end declines, and the energy supply and demand contradiction among the buses cannot be balanced.
Disclosure of Invention
The invention aims to provide a three-port converter suitable for a satellite power supply double-bus architecture, and aims to solve the technical problems.
The invention is realized in such a way that a three-port converter suitable for a satellite power double-bus architecture comprises a solar array port and a PLV bus Port and V bus A port, the solar cell array is connected to the PLV bus Ports are in a boost conversion relationship, and the solar cell array ports are connected with the V bus Transformation relationship of port buck transformation, its topological structure formed into three-port converter includes PLV bus Port, V sa Port, V bus Port, inductance L2, inductance L6, capacitance C PL Vbus1 Capacitance C PL Vbus2 Resistance Z PLV1 Resistance Z PLV2 Capacitance C in1 Capacitance C in2 An inductor L1, a capacitor C1, a diode D1, a switching tube S1, an inductor L3, a capacitor C2, a switching tube S3, a switching tube S4, an inductor L4, a switching tube S2, an inductor L4, a diode D1 and a capacitor C Vbus1 Capacitance C Vbus2 Resistance Z V1 Resistor Z V1 The PLV bus Port individual resistance Z PLV1 One end of (2)Capacitance C PL Vbus1 One end of (Z) resistance PLV2 One end of (C) capacitor PL Vbus2 One end of an inductor L6 and one end of an inductor L1, wherein the other end of the inductor L6 is respectively connected with the drain electrode of a switch tube S3 and one end of a capacitor, the source electrode of the switch tube S3 is respectively connected with the drain electrode of a switch tube S4 and one end of an inductor L5, and the other end of the inductor L5 is respectively connected with a capacitor C Vbus1 One end of V bus Port and resistor Z V1 Is one end of said V bus The ports are also respectively connected with the resistor Z V1 One end of (C) capacitor Vbus2 The other end of the inductor L4 is respectively connected with the cathode of the diode D2 and the source of the switching tube S2, the drain of the switching tube S2 is respectively connected with one end of the capacitor C2 and one end of the inductor L3, and the other end of the inductor L3 is respectively connected with the capacitor C in2 One end of (2) and V sa The other end of the inductor L2 is connected with the cathode of the diode D1 and one end of the capacitor C1 respectively, the anode of the diode D1 is connected with the drain of the switch tube S1 and one end of the inductor L1 respectively, and the other end of the inductor L1 is connected with the capacitor C respectively in1 One end of (2) and V sa A port.
The invention further adopts the technical scheme that: according to the topological public link, the V sa Port and PLV bus Inductance L1 and capacitances C1 and V between ports sa Port and V bus The inductor L3 and the capacitor C2 between the ports are combined, the inductor L2 and the inductor L6 are combined, one group of the switch tube S3, the inductor L5 and the switch tube S4 is combined with one group of the switch tube S2, the inductor L4 and the diode D2 to obtain the integrated three-port converter topological structure, which comprises PLV bus Port, V sa Port, V bus Port, capacitor C PL Vbus Resistance Z PLV Inductance L2, capacitance C in An inductor L1, a switching tube S1, a diode D1, a capacitor C1, a switching tube S2, a switching tube S3, an inductor L3 and a capacitor C Vbus Resistor Z V The PLV bus The port is respectively connected with one end of the inductor L2 and the resistor Z PLV One end of (C) and capacitor C PL Vbus Is one end of the inductorL2 is connected with one end of the capacitor C1, the cathode of the diode D1 and the drain of the switch tube S2 respectively, the source of the switch tube S2 is connected with the drain of the switch tube S3 and one end of the inductor L3 respectively, and the other end of the inductor L3 is connected with the resistor Z respectively V One end of (C) capacitor Vbus One end of (2) and V bus A port, wherein the anode of the diode D1 is connected with the drain of the switch tube S1 and one end of the inductor L1 respectively, and the other end of the inductor L1 is connected with the capacitor C respectively in One end of (2) and V sa A port.
The invention further adopts the technical scheme that: the three-port converter has a single-input single-output mode and a PLV bus The highest port voltage avoids PLV by adding a switching tube S4 and a diode D2 bus Port power flow to V when not necessary bus Ports whose topology comprises PLVs bus Port, V sa Port, V bus Port, capacitor C PL Vbus Resistance Z PLV An inductor L2, a diode D2, a switching tube S4 and a capacitor C in An inductor L1, a switching tube S1, a diode D1, a capacitor C1, a switching tube S2, a switching tube S3, an inductor L3 and a capacitor C Vbus Resistor Z V The PLV bus The port is respectively connected with one end of the inductor L2 and the resistor Z PLV One end of (C) and capacitor C PL Vbus The other end of the inductor L2 is connected with the diode D2 and the drain electrode of the switch tube S4 respectively, the source electrode of the switch tube S4 is connected with one end of the capacitor C1, the cathode of the diode D1 and the drain electrode of the switch tube S2 respectively, the source electrode of the switch tube S2 is connected with the drain electrode of the switch tube S3 and one end of the inductor L3 respectively, and the other end of the inductor L3 is connected with the resistor Z respectively V One end of (C) capacitor Vbus One end of (2) and V bus A port, wherein the anode of the diode D1 is connected with the drain of the switch tube S1 and one end of the inductor L1 respectively, and the other end of the inductor L1 is connected with the capacitor C respectively in One end of (2) and V sa A port.
The invention further adopts the technical scheme that: integrating magnetic elements in the same sub-core by magnetic integration and moving by RC damping armsExcept for the right half plane zero point in topological boost conversion, the three-terminal converter formed by the method comprises PLV bus Port, V sa Port, V bus Port, capacitor C PL Vbus Resistance Z PLV An inductor L2, a diode D2, a switching tube S4 and a capacitor C in Inductance L1 and resistance R d Capacitance C d The switch tube S1, the diode D1, the capacitor C1, the switch tube S2, the switch tube S3, the inductor L3 and the capacitor C Vbus Resistor Z V The PLV bus The port is respectively connected with one end of the inductor L2 and the resistor Z PLV One end of (C) and capacitor C PL Vbus The other end of the inductor L2 is respectively connected with the diode D2 and the drain electrode of the switch tube S4, and the source electrode of the switch tube S4 is respectively connected with one end of the capacitor C1, the cathode of the diode D1 and the resistor R d And the drain of the switch tube S2, the resistor R d Is connected with the other end of the capacitor C d The source of the switch tube S2 is respectively connected with the drain of the switch tube S3 and one end of the inductor L3, and the other end of the inductor L3 is respectively connected with the resistor Z V One end of (C) capacitor Vbus One end of (2) and V bus A port, wherein the anode of the diode D1 is connected with the drain of the switch tube S1 and one end of the inductor L1 respectively, and the other end of the inductor L1 is connected with the capacitor C respectively in One end of (2) and V sa A port.
The invention further adopts the technical scheme that: the V is sa Port power unidirectional inflow PLV bus When in port, the energy supply of the solar cell array is sufficient, the switch tube S4 is closed, and the power supply is controlled according to the inductance L 1a Volt-second equilibrium relationship of said V sa Port and PLV bus The relation of ports is PLV bus ＝V sa (1-D 1 )。
The invention further adopts the technical scheme that: the V is sa Port power unidirectional inflow V bus When the port is opened, the energy supply of the solar cell array is sufficient, the switch tube S4 is disconnected, and the power supply is controlled according to the inductance L 1b Volt-second equilibrium relationship of said V sa Port and V bus The relation of ports is V bus ＝V sa D 2 。
The invention further adopts the technical scheme that: the V is sa End power and V bus End power combining into PLV bus In the case of ports, the solar array is under-fed, or directed to the PLV bus When the module with the energy supplied by the port fails, V sa Terminal and V bus Power co-flow to PLV at the end bus The end, switch tube S4 is closed, according to inductance L 1a And L is equal to 1b The volt-second equilibrium relationship of each port is that:
the invention further adopts the technical scheme that: the V is sa End power and PLV bus End power combining and flowing into V bus Ports, solar arrays with insufficient energy supply, or to V bus When the module with the energy supplied by the port fails, V sa Terminal and PLV bus The power of the terminals flowing in common to V bus End, switch tube S 4 Closing by controlling the switching tube S 1 Realize the maximum power tracking of the solar array, control the switching tube S 2 、S 3 PLV is to bus The terminal voltage is reduced to V bus The DC gain relation between the ports is that
Another object of the present invention is to provide a control method of the three-port converter suitable for a satellite power dual bus architecture, comprising the following steps:
s1, generating a reference signal u by using voltage and current sampling signals of a sailboard, wherein the MPPT loop is arranged at the solar cell array side SA_ref As a closed loop reference to the input voltage ring;
s2, the disturbance load bus end is PLV bus Output voltage loop, generated control signal u PLMEA Determining the working mode of the converter and taking the working mode as a reference signal of an output current loop;
s3, stabilizing the load bus end to be V bus Output voltage loop, producedControl signal u MEA Determining the working mode of the converter and taking the working mode as a reference signal of an output current loop;
s4, judging PLV bus Terminal and V bus Less power requirements at the end, if PLV bus The end power requirement is small, only V is needed sa Power unidirectional inflow PLV bus When in port, switch tube S 4 Normally closed, IVL and PLV of MPPT bus The control output of OCL, the value of the latter is dominant, and compared with triangular wave to produce driving signal switch tube S 1 Thereby stabilizing PLV bus An end bus; if V bus The end power requirement is small, only V is needed sa Unidirectional inflow of power V bus When in port, switch tube S 4 Normally disconnect V bus The control output of the OCL is compared with the triangular wave to generate a driving signal switch tube S 2 S and S 3 Thereby stabilizing V bus And an end bus.
The invention further adopts the technical scheme that: the greater the disturbance load power requirement in step S2, u PLMEA The larger the value; the greater the steady load power requirement in step S3, u MEA The smaller the value.
The beneficial effects of the invention are as follows: the three-port converter in the application has simple structure, the internal inductor can be fully integrated in the same pair of magnetic cores, and the topology only comprises one magnetic element, four switching tubes, two diodes and two filter capacitors except for the filter capacitors of all ports.
The dynamic response speed is high, the dynamic response speed of the traditional Boost converter is low under the restriction of the right half plane zero point, and the right half plane zero point can be removed by inserting the RC damping branch, so that the dynamic response speed of the converter is improved.
The current of each port is continuous, and each input side and each output side of the three-port converter in the application are provided with a filter inductor, so that the current is continuous, and the capacitance value of the port filter capacitor can be effectively reduced.
The reliability of a satellite power supply platform is improved, and a solar cell array can be realized by controlling the switching tube S1 in the three-port converterMPPT, fully utilizing solar energy; by controlling the switching tube S 2 、S 3 Can realize V bus End-to-end and PLV bus The energy of the terminals is communicated, so that the two buses are backed up. Therefore, when a certain bus fails or the energy supplied by the sailboard is attenuated at the end of the service life, the whole star function is ensured not to be lost, and the reliability and the safety of the power supply system are improved.
Drawings
Fig. 1 is a schematic diagram of a three-port converter power flow in a conventional photovoltaic power generation system.
Fig. 2 is a schematic diagram of a satellite power dual bus architecture.
Fig. 3 is a schematic diagram of a power flow of a three-port converter under a satellite power dual bus architecture according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of an original topology structure between ports of a transformer in the present application according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a topology 1 between ports of a transformer incorporated in the present application according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a topology 2 between ports of a transformer incorporated in the present application according to an embodiment of the present invention.
Fig. 7 is a topology diagram of the three-port converter in the final application after optimization provided by an embodiment of the present invention.
Fig. 8 is a schematic diagram of each operation mode of the three-port converter in the present application according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of a control strategy of the three-port converter in the present application provided by an embodiment of the present invention.
Detailed Description
As shown in fig. 4-9, the three-port converter suitable for the satellite power source double-bus architecture provided by the invention not only can realize power conversion of a solar cell array and two buses, but also can send solar energy and partial power stored in a storage battery pack at one bus end to the other bus when the input power is insufficient at the end of service life or a certain bus is in fault. Thus, the three-port converter power flow direction in this application includes two single-input single-output modes and two dual-input single-output modes. As particularly shown in fig. 3.
(1) In the single-input single-output mode, the energy at the moment comes from the port of the solar cell array, namely Vsa, and the energy can be unidirectionally supplied from the PLV bus Port or V bus The port flows out.
(2) A dual-in single-out mode providing PLVs when individual parallel modules fail or the end-of-life energy supply of the detector is insufficient in a certain bus bus Port and V bus The energy communication path between ports, i.e. the three-port module can communicate solar array energy with PLV bus The energy stored by the end accumulator is jointly fed into V bus Ports, or solar energy and V bus The energy stored by the port accumulator is co-fed into the PLV bus A port.
The three-port module under the double-bus architecture has larger difference with the working mode of the module of the existing photovoltaic application background, and two load ends have energy intercommunication paths, so that the existing topology and control mode cannot be used.
And providing a brand new power topology according to the voltage-increasing and voltage-decreasing relation of the three-port converter under the satellite power double-bus architecture. First, continue the solar array port in satellite power to PLV bus The ports are boost conversion, and the solar cell array ports are connected with the V bus The ports are in a buck conversion relationship, and in order to realize current continuity of each port, a topology prototype is adopted as shown in fig. 4. Wherein V is sa With PLV bus Two inductance Boost topologies are selected, and the right half plane zero point of the traditional Boost topology can be removed by designing a proper passive element to obtain good dynamic characteristics.
Second, common links in FIG. 4, such as V sa With PLV bus L1, C1 and V between ports sa And V is equal to bus L3 and C2 between ports can be combined, and similarly, L2 and L6 are combined, and a group of S3, L5 and S4 is combined with a group of S2, L4 and D2, to obtain an integrated three-port converter as shown in fig. 5.
Again, since the three-port converter in the present application has a single-input single-output mode and PLV bus The highest port voltage to avoid PLV bus Port power flows when not necessaryTo V bus The port is added with a switching tube S4 and a diode D2 as shown in fig. 6 below.
Finally, the three-port converter architecture of fig. 6 is further optimized. The current topology comprises three magnetic elements, the existing magnetic elements are integrated in the same pair of magnetic cores in a magnetic integration mode, the connection mode of the same-name ends of the three inductors is shown in fig. 7, and the power density of the converter can be greatly improved; meanwhile, an RC damping branch is connected in parallel at the capacitor C1, which can remove the right half plane zero point during topology boost conversion and improve the dynamic characteristic of the converter.
Based on the converter, the working mode of each power flow direction is analyzed:
(1)V sa power unidirectional inflow PLV bus The port is sufficient in the energy supply of the solar cell array, and the three-port converter in the application can be simplified into a two-inductance Boost topology, and the switch tube S4 is closed at the moment, as shown in (a) of fig. 8. Setting the duty ratio of the switching tube S1 as D 1 According to inductance L 1a V in equilibrium relationship of volt-seconds sa With PLV bus The relation of (2) is:
PLV bus ＝V sa (1-D 1 ) (1)
(2)V sa unidirectional inflow of power V bus The port is sufficient in energy supply of the solar cell array at this time, and the three-port converter in the present application can be simplified into a two-inductance Buck topology, and the switching tube S4 is turned off at this time, as shown in (b) of FIG. 8. Setting the duty ratio of the switching tube S2 as D 2 The switching tubes S3 and S2 are synchronized according to the inductance L 1b V in equilibrium relationship of volt-seconds sa And V is equal to bus The relation of (2) is:
V bus ＝V sa D 2 (2)
the voltage conversion relationship of the two operation modes is the same as that of the traditional Boost converter and the traditional Buck converter.
(3)V sa Power and V bus End power combining into PLV bus Ports when the solar cell array is under-supplied with energy, or to PLVs bus When the module with the port for supplying energy fails, V needs to be set sa Terminal and V bus Power co-flow to PLV at the end bus And (3) an end. In the working mode, the switching tube S4 is closed, the maximum power tracking (Maximum Power Point Tracking, MPPT) of the solar battery array is realized by controlling the switching tube S1, and the switching tubes S2 and S3 are controlled to drive V bus The terminal voltage is pumped up to PLV bus . Then according to the inductance L 1a And L is equal to 1b The volt-second equilibrium relationship of each port is that:
(4)V sa power and PLV bus End power combining and flowing into V bus Ports when the solar cell array is in insufficient energy supply or to V bus When the module with the port for supplying energy fails, V needs to be set sa Terminal and PLV bus The power of the terminals flowing in common to V bus And (3) an end. In the working mode, the switching tube S4 is closed, the maximum power tracking of the solar cell array is realized by controlling the switching tube S1, and PLV is controlled by controlling the switching tubes S2 and S3 bus The terminal voltage is reduced to V bus . The dc gain relationship between the ports is the same as in equation (3).
According to the working mode of the three-port converter in the application, a corresponding control strategy is proposed as shown in fig. 9. The solar cell array side is an MPPT loop, and the voltage and current sampling signals of the sailboard generate a reference signal uSA _ref as a closed-loop reference of an input voltage loop (Input Voltage Loop, IVP). The disturbance load bus end is PLV bus Output voltage loop (PLV) bus Output Voltage Loop，PLV bus OVL), the generated control signal upplma determines the operating mode of the converter and acts as an output current loop (PLV) bus Output Current Loop，PLV bus OCL), it is noted that here the larger the disturbance load power demand, the larger the upplma value. The stable load busbar end is V bus Output voltage loop (V) bus Output Voltage Loop，V bus OVL), the generated control signal uMEA determines the operation mode of the converter and acts as an output current loop (V bus Output Current Loop，V bus OCL), where the greater the steady load power demand, the smaller the value of uMEA.
If PLV is bus The end power requirement is small, only V is needed sa Power unidirectional inflow PLV bus When the port is opened, the switching tube S4 is normally closed, IVL and PLV of MPPT bus The control output of OCL is mainly higher in value, and compared with triangular wave to produce driving signal switching tube S1 so as to stabilize PLV bus An end bus; when PLV bus End power requirements increase, requiring V sa Power and V bus End power combining into PLV bus When the port is opened, the switching tube S4 is still normally closed, IVL and PLV of MPPT bus The control output of the OCL is mainly provided with a larger numerical value, and compared with a triangular wave, a driving signal switching tube S1 is generated to realize the maximum power control of the solar sailboard, and PLV bus The control output of OCL is compared with triangular wave to generate drive signal switching tubes S2 and S3, so as to stabilize PLV bus And an end bus.
If V bus The end power requirement is small, only V is needed sa Unidirectional inflow of power V bus When the port is opened, the switching tube S4 is normally opened, V bus The control output of OCL is compared with triangular wave to generate drive signal switching tubes S2 and S3, so as to stabilize V bus An end bus; when V is bus End power requirements increase, requiring V sa Power and PLV bus End power combining and flowing into V bus When the port is opened, the switching tube S4 is normally closed, IVL and V of MPPT bus The value of the former is smaller to take the dominant role among the control outputs of the OCL, and the former is compared with the triangular wave to generate a driving signal switching tube S1 to realize the maximum power control of the solar sailboard, V bus The control output of OCL is compared with triangular wave to generate drive signal switching tubes S2 and S3, so as to stabilize V bus And an end bus.
When the satellite power supply has N three-port converters in the application to output in parallel, the PLV is shared among N modules bus OVL controller and V bus OVL controller, each module having an independent IVL controller, PLV for MPPT bus OCL controlSystem and V bus OCL controller. The larger the disturbance load power requirement in the control strategy is, the larger the uPLMEA value is; and the larger the stable load power requirement is, the smaller the uMEA value is, the starting threshold values of N modules are divided by utilizing the equal proportion of uPLMEA and uMEA, and the priorities of two output buses are set, so that the execution conditions of each working mode can be obtained.
In order to isolate the influence of strong disturbance load on stable load in a satellite platform, more and more satellite-borne power supply systems select a double-bus architecture. However, the traditional double-bus architecture has no energy communication path between the strong disturbance load bus and the stable load bus, so that the satellite part function is lost when any bus parallel module fails or the sailboard supplies energy to decay at the end of service life. For this situation, a three-port converter should be used between the solar sailboard and the double bus, but the three-port converter is different from the existing three-port converter in the field of industrial products such as distributed photovoltaic power generation systems and hybrid energy storage systems, and in order to solve the above-mentioned problems, the present patent correspondingly proposes a three-port converter and a control method thereof.
The converter has the advantages that:
(1) The three-port converter in the application has simple structure, the internal inductor can be fully integrated in the same pair of magnetic cores, and the topology only comprises one magnetic element, four switching tubes, two diodes and two filter capacitors except for the filter capacitors of all ports.
(2) The dynamic response speed is high, the dynamic response speed of the traditional Boost converter is low under the restriction of the right half plane zero point, and the right half plane zero point can be removed by inserting the RC damping branch, so that the dynamic response speed of the converter is improved.
(3) The current of each port is continuous, and each input side and each output side of the three-port converter in the application are provided with a filter inductor, so that the current is continuous, and the capacitance value of the port filter capacitor can be effectively reduced.
(4) The reliability of a satellite power supply platform is improved, MPPT of a solar cell array can be achieved by controlling the switching tube S1 in the three-port converter, and solar energy is fully utilizedThe method comprises the steps of carrying out a first treatment on the surface of the V can be realized by controlling the switching tubes S2 and S3 bus End-to-end and PLV bus The energy of the terminals is communicated, so that the two buses are backed up. Therefore, when a certain bus fails or the energy supplied by the sailboard is attenuated at the end of the service life, the whole star function is ensured not to be lost, and the reliability and the safety of the power supply system are improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The three-port converter suitable for the satellite power supply double-bus architecture comprises a solar array port and a PLV bus Port and V bus A port, the solar cell array is connected to the PLV bus Ports are in a boost conversion relationship, and the solar cell array ports are connected with the V bus Transformation relationship of port buck transformation, its topological structure formed into three-port converter includes PLV bus Port, V sa Port, V bus Port, inductance L2, inductance L6, capacitance C PLVbus1 Capacitance C PLVbus2 Resistance Z PLV1 Resistance Z PLV2 Capacitance C in1 Capacitance C in2 An inductor L1, a capacitor C1, a diode D1, a switching tube S1, an inductor L3, a capacitor C2, a switching tube S3, a switching tube S4, a capacitor C100, an inductor L5, a switching tube S2, an inductor L4, a diode D2 and a capacitor C Vbus1 Capacitance C Vbus2 Resistance Z V1 Resistor Z V2 The PLV bus Port individual resistance Z PLV1 One end of (C) capacitor PLVbus1 One end of (Z) resistance PLV2 One end of (C) capacitor PLVbus2 One end of an inductor L6 and one end of an inductor L2, wherein the other end of the inductor L6 is respectively connected with the drain electrode of a switch tube S3 and one end of a capacitor C100, the source electrode of the switch tube S3 is respectively connected with the drain electrode of a switch tube S4 and one end of an inductor L5, and the other end of the inductor L5 is respectively connected with the capacitor C Vbus1 One end of (3),V bus Port and resistor Z V1 Is one end of said V bus The ports are also respectively connected with the resistor Z V2 One end of (C) capacitor Vbus2 The other end of the inductor L4 is respectively connected with the cathode of the diode D2 and the source of the switching tube S2, the drain of the switching tube S2 is respectively connected with one end of the capacitor C2 and one end of the inductor L3, and the other end of the inductor L3 is respectively connected with the capacitor C in2 One end of (2) and V sa The other end of the inductor L2 is connected with the cathode of the diode D1 and one end of the capacitor C1 respectively, the anode of the diode D1 is connected with the drain of the switch tube S1 and one end of the inductor L1 respectively, and the other end of the inductor L1 is connected with the capacitor C respectively in1 One end of (2) and V sa A port; capacitor C PLVbus1 The other end of (C) and the capacitance C PLVbus2 And the other end of (Z) resistance V1 And the other end of (Z) resistance V2 And the other end of (Z) resistance PLV And the other end of (Z) resistance PLV2 The other end of the capacitor C1, the other end of the capacitor C2, the capacitor C in1 The other end of (C) and the capacitance C in2 The other end of (C) and the capacitance C Vbus1 The other end of (C) and the capacitance C Vbus2 The other end of the transistor, the source of the switching transistor S1, and the source of the switching transistor S4 are grounded, respectively.
2. The three-port converter for a dual bus architecture of a satellite power supply according to claim 1, wherein said V according to a topological common link sa Port and PLV bus Inductance L1 and capacitances C1 and V between ports sa Port and V bus The inductor L3 and the capacitor C2 between the ports are combined, the inductor L2 and the inductor L6 are combined, one group of the switch tube S3, the inductor L5 and the switch tube S4 is combined with one group of the switch tube S2, the inductor L4 and the diode D2 to obtain the integrated three-port converter topological structure, which comprises PLV bus Port, V sa Port, V bus Port, capacitor C PLVbus Resistance Z PLV Inductance L2, capacitance C in An inductor L1, a switching tube S1, a diode D1, a capacitor C1, a switching tube S2, a switching tube S3, an inductor L3 and a capacitor C Vbus Resistor Z V The PLV bus The port is respectively connected with one end of the inductor L2 and the resistor Z PLV One end of (C) and capacitor C PLVbus The other end of the inductor L2 is respectively connected with one end of the capacitor C1, the cathode of the diode D1 and the drain of the switch tube S2, the source of the switch tube S2 is respectively connected with the drain of the switch tube S3 and one end of the inductor L3, and the other end of the inductor L3 is respectively connected with the resistor Z V One end of (C) capacitor Vbus One end of (2) and V bus A port, wherein the anode of the diode D1 is connected with the drain of the switch tube S1 and one end of the inductor L1 respectively, and the other end of the inductor L1 is connected with the capacitor C respectively in One end of (2) and V sa A port; capacitor C PLVbus And the other end of (Z) resistance PLV The other end of (C) and the capacitance C in The other end of the capacitor C1, the other end of the capacitor C Vbus And the other end of (Z) resistance V The other ends of the two are respectively grounded.
3. The three-port converter adapted for a satellite power dual bus architecture of claim 2, wherein the three-port converter has a single input single output mode and PLV bus The highest port voltage avoids PLV by adding a switching tube S4 and a diode D2 bus Port power flow to V when not necessary bus Ports whose topology comprises PLVs bus Port, V sa Port, V bus Port, capacitor C PLVbus Resistance Z PLV An inductor L2, a diode D2, a switching tube S4 and a capacitor C in An inductor L1, a switching tube S1, a diode D1, a capacitor C1, a switching tube S2, a switching tube S3, an inductor L3 and a capacitor C Vbus Resistor Z V The PLV bus The port is respectively connected with one end of the inductor L2 and the resistor Z PLV One end of (C) and capacitor C PLVbus The other end of the inductor L2 is connected with the diode D2 and the drain electrode of the switch tube S4 respectively, the source electrode of the switch tube S4 is connected with one end of the capacitor C1, the cathode of the diode D1 and the drain electrode of the switch tube S2 respectively, and the source electrode of the switch tube S2 is connected with the drain electrode of the switch tube S3 and the inductor L3 respectivelyThe other end of the inductor L3 is respectively connected with the resistor Z V One end of (C) capacitor Vbus One end of (2) and V bus A port, wherein the anode of the diode D1 is connected with the drain of the switch tube S1 and one end of the inductor L1 respectively, and the other end of the inductor L1 is connected with the capacitor C respectively in One end of (2) and V sa A port; capacitor C PLVbus And the other end of (Z) resistance PLV The other end of the inductor L2, the anode of the diode D2, and the capacitor C in The other end of the switch triode S1, the other end of the capacitor C1, the source of the switch triode S3 and the capacitor C Vbus And the other end of (2) and the resistor Z V The other ends of the two wires are respectively grounded.
4. A three-port converter for a satellite power dual bus architecture according to claim 3, wherein the magnetic elements are integrated in the same secondary core by magnetic integration and the right half-plane zero point during topological boost conversion is removed by RC damping branch, and the three-port converter comprises PLV bus Port, V sa Port, V bus Port, capacitor C PLVbus Resistance Z PLV Inductance L 1c Diode D2, switch tube S4, capacitor C in Inductance L 1b Resistance R d Capacitance C d A closing tube S1, a diode D1, a capacitor C1, a switching tube S2, a switching tube S3 and an inductor L 1a Capacitance C Vbus Resistor Z V The inductance L 1a Inductance L 1b Inductance L 1c Integrated in the same core, the PLV bus Ports are respectively connected with the inductance L 1c One end of (Z) resistance PLV One end of (C) and capacitor C PLVbus Is one end of the inductance L 1c The other end of the switch tube S4 is connected with the drain electrode of the diode D2 and the drain electrode of the switch tube S4 respectively, and the source electrode of the switch tube S4 is connected with one end of the capacitor C1, the cathode of the diode D1 and the resistor R respectively d And the drain of the switch tube S2, the resistor R d Is connected with the other end of the capacitor C d The source of the switch tube S2 is connected with the drain of the switch tube S3 and the inductor L respectively 1b Is one end of the inductance L 1b The other ends of the resistors Z are respectively connected with V One end of (C) capacitor Vbus One end of (2) and V bus A port, wherein the anode of the diode D1 is connected with the drain electrode of the switch tube S1 and the inductance L respectively 1a Is one end of the inductance L 1a The other ends of the capacitors are respectively connected with the capacitor C in One end of (2) and V sa A port; the capacitor C PLVbus And the other end of (Z) resistance PLV The other end of the diode D2, the other end of the capacitor Cin, the source of the switch triode S1, the other end of the capacitor C1, the capacitor C d The other end of the switch triode S3, the source electrode and the capacitor C Vbus And the other end of (2) and the resistor Z V The other ends of the two are respectively grounded.
5. The three-port converter for a satellite power dual bus architecture of claim 4, wherein said V sa Port power unidirectional inflow PLV bus When in port, the energy supply of the solar cell array is sufficient, the switch tube S4 is closed, and the power supply is controlled according to the inductance L 1a Volt-second equilibrium relationship of said V sa Port and PLV bus The relation of ports is PLV bus ＝V sa (1-D 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein D is 1 To set the duty cycle of the switching tube S1.
6. The three-port converter for a satellite power dual bus architecture of claim 5, wherein said V sa Port power unidirectional inflow V bus When the port is opened, the energy supply of the solar cell array is sufficient, the switch tube S4 is disconnected, and the power supply is controlled according to the inductance L 1b Volt-second equilibrium relationship of said V sa Port and V bus The relation of ports is V bus ＝V sa D 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein D is 2 To set the duty cycle of the switching tube S2.
7. The three-port converter for a satellite power dual bus architecture of claim 6, wherein said V sa End power and V bus End powerMerging flows into PLV bus In the case of ports, the solar array is under-fed, or directed to the PLV bus When the module with the energy supplied by the port fails, V sa Terminal and V bus Power co-flow to PLV at the end bus The end, switch tube S4 is closed, according to inductance L 1a And L is equal to 1b The volt-second equilibrium relationship of each port is that:
8. the three-port converter for a satellite power dual bus architecture of claim 7, wherein said V sa End power and PLV bus End power combining and flowing into V bus Ports, solar arrays with insufficient energy supply, or to V bus When the module with the energy supplied by the port fails, V sa Terminal and PLV bus The power of the terminals flowing in common to V bus End, switch tube S 4 Closing by controlling the switching tube S 1 Realize the maximum power tracking of the solar array, control the switching tube S 2 、S 3 PLV is to bus The terminal voltage is reduced to V bus The DC gain relation between the ports is that
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9. A control method of a three-port converter suitable for a dual bus architecture of a satellite power supply according to any one of claims 1 to 8, characterized in that the control method of a three-port converter suitable for a dual bus architecture of a satellite power supply comprises the steps of:
s1, generating a reference signal u by using voltage and current sampling signals of a sailboard, wherein the MPPT loop is arranged at the solar cell array side SA_ref As a closed loop reference to the input voltage ring;
s2, the disturbance load bus end is PLV bus Output voltage loop, generated control signal u PLMEA Determining the converterThe working mode is used as a reference signal of an output current loop;
s3, stabilizing the load bus end to be V bus Output voltage loop, generated control signal u MEA Determining the working mode of the converter and taking the working mode as a reference signal of an output current loop;
s4, judging PLV bus Terminal and V bus The power requirement of the terminal is less than V sa End-supplied power, if PLV bus The end power requirement is less than V bus The power of the terminal is then only V sa Power unidirectional inflow PLV bus When in port, switch tube S 4 Normally closed, IVL and PLV of MPPT bus The control output of OCL, the latter has large value and takes the dominant position, and compared with triangular wave to produce driving signal switch tube S 1 Thereby stabilizing PLV bus An end bus; when PLV bus End power requirements increase, requiring V sa Power and V bus End power combining into PLV bus When the port is opened, the switching tube S4 is still normally closed, IVL and PLV of MPPT bus The control output of the OCL is mainly provided with a larger numerical value, and compared with a triangular wave, a driving signal switching tube S1 is generated to realize the maximum power control of the solar sailboard, and PLV bus The control output of OCL is compared with triangular wave to generate drive signal switching tubes S2 and S3, so as to stabilize PLV bus An end bus;
if V bus The end power requirement is less than V sa The end provides power, only requiring V sa Unidirectional inflow of power V bus When in port, switch tube S 4 Normally disconnect V bus The control output of the OCL is compared with the triangular wave to generate a driving signal switch tube S 2 S and S 3 Thereby stabilizing V bus An end bus; when V is bus End power requirements increase, requiring V sa Power and PLV bus End power combining and flowing into V bus When the port is opened, the switching tube S4 is normally closed, IVL and V of MPPT bus The value of the former is smaller to take the dominant role among the control outputs of the OCL, and the former is compared with the triangular wave to generate a driving signal switching tube S1 to realize the maximum power control of the solar sailboard, V bus After the control output of the OCL is compared with the triangular waveGenerating driving signal switching transistors S2 and S3 to stabilize V bus An end bus; OCL is an abbreviation for Output Current Loop, output current loop.
10. The method for controlling a three-port converter for a dual bus architecture of a satellite power supply according to claim 9, wherein the greater the disturbance load power requirement in step S2, u PLMEA The larger the value; the greater the steady load power requirement in step S3, u MEA The smaller the value.
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