Cold backup distributed energy management system

Abstract

The invention relates to a cold backup distributed energy management system which comprises N + 1 identical converters, the converters 1-N are conventional converters, the converters N + 1 are cold backup converters, the input end of each conventional converter is provided with an independent power switch, and on-off control over a solar cell array and the conventional converters is achieved; the input end of the cold standby converter is provided with N power switches which are respectively connected with the input ends of the 1-N conventional converters. When any conventional converter breaks down, the cold standby converter starts to work, and power loss caused by converter faults is supplemented. The fault state is automatically judged, the fault converter is isolated through the switch, meanwhile, the cold standby converter is put into use, and normal work of the system is maintained. The energy management system adopts limited backup and appropriate redundancy measures, only responds to a primary fault and stops responding to a secondary fault, the reliability of the system is ensured, the weight of the system is greatly reduced, and the load ratio of a spacecraft platform is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of spacecraft energy management systems, and in particular to a cold backup distributed energy management system. Background Art

[0002] When a spacecraft is operating in space, due to space conditions, the maintainability and replaceability of its power system are poor. Therefore, in order to ensure the long-term reliable operation of the spacecraft, it must have a highly reliable power system. The power system of a spacecraft is mainly composed of solar arrays, battery packs and power management systems. Among them, solar arrays and battery packs are linear sources with high reliability; the power management system belongs to the category of electronic components and its reliability is relatively low. Summary of the invention

[0003] The purpose of the present invention is to provide a cold backup distributed energy management system to solve the problems existing in the prior art: the hot backup circuit of the power management system works simultaneously with the normal circuit, which reduces the working life of the backup circuit and affects the reliability. In addition, the hot backup margin is large, which limits the reduction of the system weight. Conventional cold backup uses 1:1 backup, and the margin is too large. For aerospace power supplies with high reliability, most of the cold backup circuits are not enabled to work throughout their life cycle, resulting in a waste of resources and weight.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: to provide a cold standby distributed energy management system, which is composed of N+1 identical converters, wherein converters 1 to N are standby converters, and converter N+1 is a cold standby converter;

[0005] The input ends of the converters 1 to N are connected to switches K1 to K2 respectively. N The output end is connected to the power bus;

[0006] Switch K 1～N The input ends are connected to independent solar cell arrays respectively, and the output ends are connected to the input ends of converters 1 to N respectively;

[0007] The input ends of the converter are connected to switches K N+1_1 ~K N+1_N The output end is connected to the power bus;

[0008] Each of the standby converters is provided with an independent control circuit.

[0009] Further, the control circuit includes a control unit C1, a control unit C2 and a multi-input OR gate unit;

[0010] The control unit C1 has two input ports, one of which is connected to a reset signal Reset. _x, and the other input port is connected to the output signal S of the current converter x ZT_x , where x is any one of 1 to N; the control unit C1 has two output ports, one of which outputs a signal Q x , the other output port outputs the signal S ZT_kx ;

[0011] The control unit C2 has three input ports, one of which is connected to a reset signal Reset. _x The second input port is connected to the output signal R of the multi-input OR gate ENx The third input port is connected to the output signal S of the control unit C1 ZT_kx The control unit C2 has two output ports, one output port outputs a signal T JZx , the other output port outputs the signal Q N+1_x ;

[0012] The multi-input OR gate unit has N-1 input ports, which are respectively connected to the output signals T of the other conventional converters except the current converter x. JZ1 ~T JZN , excluding T JZx The multi-input OR gate unit has an output port output signal R ENx .

[0013] Furthermore, the control unit C1 has autonomous fault diagnosis and protection functions;

[0014] When converter x fails, the status signal S ZT_kx is set to a fault state; the control unit C1 detects the signal S ZT_kx When the fault state is set, the output signal Q x Disconnect the power switch K x , to achieve fault protection for converter x, and at the same time, the signal S ZT_kx Set to protection state.

[0015] Furthermore, the control unit C2 has the function of starting the cold standby converter;

[0016] The control unit C2 detects the signal S ZT_kx is set to protection state, and when the signal R ENx When it is low level, the control unit C2 passes the signal Q N+1_x Turn on the power switch K N+1_x , enable the cold standby converter N+1, and at the same time send the signal T JZx Set to 1. When the signal R ENx When it is at a high level, the control unit C2 is in a standby state.

[0017] Furthermore, the control units C1 and C2 have a reset function;

[0018] When the reset signal Reset _x Set to 1, control units C1 and C2 return to the initialization state.

[0019] Further, the control circuit has a unique response function;

[0020] When converter x fails, its control unit C2 sends signal T JZx Set to 1, the output signal R of the multi-input OR gate unit of the remaining N-1 conventional converters EN1 ~R ENN , excluding R ENx All are high level, and the control unit C2 of the converter is in standby state.

[0021] The beneficial effects achieved by the cold backup distributed energy management system provided by the present invention are:

[0022] The present invention adopts limited backup and appropriate redundancy measures, responds to only one fault and prevents responding to a secondary fault, thereby ensuring system reliability while greatly reducing system weight and improving the load ratio of the spacecraft platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The invention will be further described below in conjunction with the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the N+1 cold backup distributed energy management system and its control circuit of the present invention. DETAILED DESCRIPTION

[0025] The cold backup distributed energy management system proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0026] like Figure 1 As shown, the cold standby distributed energy management system of the present invention is composed of N+1 identical converters, converters 1 to N are standby converters, converter N+1 is a cold standby converter, and all converters are distributed, their inputs are connected to different solar arrays, and their outputs are connected in parallel. The input end of the standby converter has one on-off switch, and the input end of the cold standby converter has N on-off switches, corresponding to the N standby converters.

[0027] like Figure 1As shown, the control circuit of the converter of the distributed energy management system of the present invention includes a converter x (x can be any one of 1-N); a normally closed switch K x , connected in series to the positive line of the input terminal of the converter x; control circuit C x , control the normally closed switch K x The on / off state of the output ZT_kx . Converter N+1; normally-off switch K N+1_x , connected in series to the positive line of the input terminal of converter N+1; control circuit C N+1_x , control the normally-off switch K N+1_x When the control circuit C x When a fault is detected in converter x, the normally closed switch kx is opened and the control circuit C is notified. N+1_x Close switch K N+1_x , enable the cold standby converter N+1 to achieve the purpose of circuit redundancy.

[0028] The working principle of the present invention is as follows:

[0029] Converter x detects its own state and if it fails, it changes its state output signal S ZT_x .

[0030] The control circuit C1 continuously detects the status signal S ZT_x , when the signal S is detected ZT_x When the fault state occurs, the converter x is judged to be faulty, and then the normally closed switch K is disconnected. x , and the status signal S ZT_kx Set to fault state.

[0031] The input signal R of the control circuit C2 ENx is the enable signal. When the enable signal is low, the control circuit C N+1_x Normal operation; when the power signal is high, the control circuit C N+1_x Not working.

[0032] The external reset signal Reset_x can make the control circuit C x Reset, that is, close the normally closed switch K x , reset status signal S ZT_kx .

[0033] When the enable signal R ENx When it is low level, the control circuit C N+1_x Detection detection status signal S ZT_kx , when the signal S ZT_kx When the control circuit C N+1_x Immediately close switch K N+1_x , so that the cold standby converter N+1 is put into operation to compensate for the power loss caused by the failure of the standing converter; at the same time, the control circuit CN+1_x The logic signal T JZX Set high.

[0034] The rest of the input signals of the multi-input OR gate are converted into logic signals T JZY (Y is all values ​​from 1 to N except X), as long as one input is set high, the control circuit C2 does not work, and the current switch K N+1_x Both switches are no longer closed, that is, only one switch at the input end of the cold standby converter is allowed to be closed.

[0035] Therefore, as long as any input switch of converter N+1 is closed, the remaining input switches will be prevented from closing, thereby ensuring the reliability of the system.

[0036] The contents not described in detail in this specification belong to the prior art known to those skilled in the art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A cold backup distributed energy management system, characterized in that: It consists of N+1 identical converters, where converters 1 to N are standby converters and converter N+1 is a cold standby converter. The input ends of the converters 1 to N are connected to switches K1 to K2 respectively. N The output end is connected to the power bus; Switch K 1～N The input ends are connected to independent solar cell arrays respectively, and the output ends are connected to the input ends of converters 1 to N respectively; The input ends of the converter are connected to switches K N+1_1 ~K N+1_N The output end is connected to the power bus; Each of the standby converters is provided with an independent control circuit.

2. The cold backup distributed energy management system according to claim 1, characterized in that: The control circuit comprises a control unit C1, a control unit C2 and a multi-input OR gate unit; The control unit C1 has two input ports, one of which is connected to a reset signal Reset. _x , and the other input port is connected to the output signal S of the current converter x ZT_x , where x is any one of 1 to N; the control unit C1 has two output ports, one of which outputs a signal Q x , the other output port outputs the signal S ZT_kx ; The control unit C2 has three input ports, one of which is connected to a reset signal Reset. _x The second input port is connected to the output signal R of the multi-input OR gate ENx The third input port is connected to the output signal S of the control unit C1 ZT_kx The control unit C2 has two output ports, one output port outputs a signal T JZx , the other output port outputs the signal Q N+1_x ; The multi-input OR gate unit has N-1 input ports, which are respectively connected to the output signals T of the other conventional converters except the current converter x. JZ1 ~T JZN , excluding T JZx The multi-input OR gate unit has an output port output signal R ENx .

3. The cold backup distributed energy management system according to claim 2, characterized in that: The control unit C1 has autonomous fault diagnosis and protection functions; When converter x fails, the status signal S ZT_kx is set to a fault state; the control unit C1 detects the signal S ZT_kx When the fault state is set, the output signal Q x Disconnect the power switch K x , to achieve fault protection for converter x, and at the same time, the signal S ZT_kx Set to protection state.

4. The cold backup distributed energy management system according to claim 2, characterized in that: The control unit C2 has the function of starting the cold standby converter; The control unit C2 detects the signal S ZT_kx is set to protection state, and when the signal R ENx When it is low level, the control unit C2 passes the signal Q N+1_x Turn on the power switch K N+1_x , enable the cold standby converter N+1, and at the same time send the signal T JZx Set to 1. When the signal R ENx When it is at a high level, the control unit C2 is in a standby state.

5. The cold backup distributed energy management system according to claim 2, characterized in that: The control units C1 and C2 have a reset function; When the reset signal Reset _x Set to 1, control units C1 and C2 return to the initialization state.

6. The cold backup distributed energy management system according to claim 2, characterized in that: The control circuit has a unique response function; When converter x fails, its control unit C2 sends signal T JZx Set to 1, the output signal R of the multi-input OR gate unit of the remaining N-1 conventional converters EN1 ~R ENN , excluding R ENx All are high level, and the control unit C2 of the converter is in standby state.

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