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Method to control autonomous system of spacecraft power supply. RU patent 2521538.

IPC classes for russian patent Method to control autonomous system of spacecraft power supply. RU patent 2521538. (RU 2521538):

H02J7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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FIELD: electricity.

SUBSTANCE: invention is related to electric engineering and namely to power supply systems (PSS) of spacecraft using solar batteries as the primary energy sources and accumulator batteries as energy accumulators. The invention suggests a method for control of autonomous system of spacecraft power supply that contains a solar battery and n of accumulator battery, a voltage stabiliser coupled between the solar battery and load and n of charge and discharge devices; the method lies in control of the voltage stabiliser and charge and discharge devices depending on input and output voltage of the system, control of charge and discharge degree of the accumulator batteries, prohibition of operation for the respective charge device when it reaches the charge limit of the accumulator battery, enablement of operation when a certain discharge degree is reached by this accumulator battery, prohibition of operation for the respective discharge device when it reaches the discharge limit of the accumulator battery, enablement of operation when a certain charge degree is reached by this accumulator battery, at that in case when solar batteries loose their orientation to the Sun or in case of emergency discharge of accumulator batteries operation of all discharge devices is banned (locked), and after recovery of the solar batteries orientation to the Sun and charge of the accumulator batteries up to the preset level operation of all discharge devices is unlocked.

EFFECT: improvement of the PSS reliability in case of emergencies related to unscheduled loss of solar batteries orientation to the Sun.

3 cl, 2 dwg

 

The invention refers to electrical engineering, namely to power supply systems (SES) SPACECRAFT (SC), using as a primary energy sources solar batteries (SB), and as energy storage - rechargeable batteries).

Known way to control the Autonomous power supply system (patent RF №2059988, H02J 7/35)containing the solar battery (SA), a voltage regulator, connected between the solar battery and load, n batteries (n > 1), and "n" (AB) charge and discharge devices and for each AB - device control the degree of charge.

In the famous SES is carried out continuous control voltage, charge and discharge devices depending on the input (voltage SB) and output voltages SES. This charger ensures the battery charging, and a voltage regulator and a bit device can provide power to consumers.

Chain of continuous control (feedback) on the charger connected to the bus and SAT bus loads, a chain of continuous control voltage and discharge devices connected to the bus-load.

Depending on the degree of charge or discharge AB is a prohibition or permission charger works and discharge devices.

Such management provides longer operating SES. However, it does not provide fault tolerance SES when abnormal or emergency situations on the SPACECRAFT. In case of emergency, unplanned violations orientation of the SPACECRAFT solar Sun is a violation of the energy balance in the SES. If the loss of orientation will be prolonged, can be a total discharge of all AB. The onboard power consumers will then cease.

Known way to control the Autonomous power supply system (patent RF №2168828, H01J 7/36)containing the solar battery and n batteries, where n > 1, a voltage regulator, connected between the sun battery and load and n charge and discharge devices, consisting in the management of voltage and charge-discharge devices depending on the input and output voltage of the system, control level of charge and discharge batteries, ban the work of a proper charger when approaching extreme level a charge this battery pack, remove the ban on reaching a certain level of discharge this battery pack, the ban on the work of the relevant bit of the device when the limit level low battery charge this battery pack, remove the ban on reaching a certain level of charge this battery pack, characterized in that in case of loss of orientation of solar panels in the Sun, emergency battery discharge and disable parts bit device when the power remaining in the work of the bit devices is insufficient to power the load, prohibit all bit devices and voltage regulator, and stop running bit devices on signals about the condition of charge, then the danger of reverse polarity battery some batteries to it connect a device of protection of batteries against polarity reversal, after restoring the orientation of solar panels in the Sun at first make the batteries up to a certain amount of capacity, and then permit operation of the voltage regulator and resume control bit devices on signals about the condition of charge, the device protection of batteries against polarity reversal switch off after the beginning of the battery's charge.

This method is taken as a prototype of the claimed invention.

There is a method solves the problem of prevention of failure of battery AB, restore the normal functioning of the SES after abnormal or emergency situation.

However, the known method does not take into account the following fact. Currently, the SPACECRAFT have found wide application SES with several nominal output voltage. As a rule, it power system with parallel voltage regulator solar batteries (level 100 and more) and additional stabilization stress loads of smaller par value of tyres first load stable series converters. The structure of the SES reflected in the patent №2258292 EN dated 10 August 2005, according to which the power direct current from the source of limited power, such as solar panels, and the secondary source of electricity, for example batteries, is to stabilize the voltage on the load and the coordination of primary and secondary sources of electricity while stabilize n nominal voltage, and initially stabilize the voltage on the load, with a maximum supply voltage, and the voltage regulation of the remaining (n-1) loads carried out from power bus first load stable series converters, with the coordination of primary and secondary sources of electricity carried out only at the first level of the voltage and the voltage on the first level spend shunt or squirrel stabilized Converter.

For such SES famous invention requires a significant and fundamental improvements.

The task of the claimed invention is to increase the reliability of the SES at occurrence of emergency situations associated with an unplanned loss of orientation of the SPACECRAFT to the Sun.

The problem is solved by the fact that in the Autonomous power supply system of the spacecraft containing the solar battery and rechargeable n battery, voltage regulator, connected between solar and load and n charge and discharge devices, consisting in the management of voltage and charge-discharge devices depending on the input and output voltage of the system, control level of charge and discharge batteries, ban the work of a proper charger when approaching extreme level a charge this battery pack, remove the ban on reaching a certain level of discharge this battery pack, prohibition to work the corresponding bit device when approaching extreme level low battery charge this battery pack, remove the ban on reaching a certain level of charge this battery pack, while in case of loss of orientation of solar panels in the Sun, emergency battery discharge, prohibit(block) all bit devices, after restoring the orientation of solar panels in the Sun and charge the battery up to a specified level unlock all bit devices in power supply system with parallel voltage regulator solar panels and additional stabilization stress loads of smaller par value of tyres first load stable series converters are blocking the work of the data series stable converters, control the current solar panels, and releases the lock works stable series converters after exceeding the current solar panels pre-determined value. However, to block stable series converters removed after exceeding the current solar batteries values calculated from the ratio:

BS>(∑P SP /U SP +P ZAR /U ZAR )·n·k, where :

BS - current solar batteries; A;

P SP - power series stable Converter; W;

U SP - load voltage stable series Converter; W;

P ZAR - power for charging of accumulator batteries; W;

U ZAR minimum charging voltage; W;

n is the number of accumulator batteries;

k - coefficient of linefill (taking account of converters, etc.),

or the amount calculated based on the ratio:

BS>(∑P JV )k/U BS , where

BS-current solar panels, And;

P SP - power series stable Converter, W;

k - coefficient of linefill (taking account of converters, etc.);

U BS - rated voltage of the solar Century

At the discharge of each AB to the lower limit of this level AB is translated in storage mode.

After disabling the corresponding bit of the device power is remaining bit enabled devices from other AB, has not yet reached the specified level of discharge.

If after the ban multiple bit devices power remaining in the work of the JSB and the corresponding bit devices are not enough to ensure the supply side of consumers, prohibit all bit devices and stable series converters. The signal transition SES in storage mode can be, as well, reducing the voltage on the output tyres SES to a particular value (the lack of capacity of working bit devices output voltage SES begin to decline).

Accidental appearance of light SAT or restoring orientation SAT in the Sun and increasing the output voltage parallel stabilizer to the nominal value will be charging. You can unlock operation of the discharge devices and stable series converters. However, early inclusion series stabilized transducers can lead to the fact that the PV array voltage will remain at less than the nominal value (on the current-voltage characteristic is to the left of the voltage at the operating point) due to consumption Autonomous power supply system with no regulatory series converters (power transistors are completely open). This phenomenon is characteristic of SES with high output voltage (100 or more), when to get a high power use SAT with high voltage and proportionally less current (to reduce active power losses). Therefore, an effective solution here is to enable stable series converters at the current SAT sufficient to ensure as to charge the battery and to power consumers through a series voltage converters. This state operating point SB (close to the open-circuit voltage, or more precisely to the working point of maximum power). When used in power supply system of parallel voltage regulator solar cells have the ability to control the current SS even in the absence of load, as in this case, the entire current going through short regulatory transistor (after reaching the level of the stabilized voltage, for example 100).

Figure 2, shows the functional diagram of the Autonomous power supply system of the SPACECRAFT for the implementation of the proposed method which uses one stable series Converter for the organization of the second (lower, for example 27 In) voltage.

Autonomous power supply system KA contains a solar panel 1 with a current measuring shunt 1-1 in sub-zero circuit connected to a load of 2, and parallel voltage regulator 3 solar panels 1, rechargeable battery 4 1 -4 n , connected via charger 5 1 -5 n to a solar panel 1, and after a bit device 6 1 -6 n to the entrance to the output filter 23 voltage 3. In parallel to load 2 through a series of stabilized voltage Converter 20 connected to low voltage load 2-1.

In this case the load 2-1 in its composition contains the on-Board computer, system of the telemetry and command-measuring radio line (not shown).

Parallel with accumulator battery 4 1 -4 n connected device control batteries 7 1 -7 n associated entrance with storage batteries 4 1 -4 n to monitor the battery voltage and the output load 2-1.

In the chain of charge-discharge batteries installed measuring shunt -8 8 1 n .

Parallel voltage regulator consists of 3 short regulatory transistor 21, managed by the control circuit 22 and decoupling diode 23 in the plus bus SAT.

Charger 5 1 -5 n consist of control key 9, managed by the control circuit 10, booster unit, performed at the transformer 5-3, transistors 5-1 and 5-2 and rectifier diodes 5-4 and 5-5.

Bit device 6 1 -6 n consist of control key 11, managed by the control circuit 12.

Series stabilized voltage Converter consists of 20 control key 13, managed by the control circuit 14, input filter capacitor 15 and output filter on the diode 17, choke 18 and condenser 16.

Control circuit: 10 - chargers 5 1 -5 n , 12 - bit devices 6 1 -6 n 22 - parallel voltage 3 and 14 - series stabilized voltage Converter 20, made in the form of a pulse-width modulators, connected to the tyres of the stabilized voltage. Control circuits 10 chargers 5 1 -5 n optionally associated with measuring shunt -8 8 1 n and a load of 2.

Control sensor current 19 solar panels 1 connected entrance to the shunt 1-1 solar panels 1, and access to stable series Converter voltage 20.

The device works as follows. During operation rechargeable battery 4 1 -4 n work mainly in the storage and periodic dzarazov from solar panels 1 through charger 5 1 -5 n . Power 2 is thus the solar panels 1 through parallel voltage stabilizer 3, and load 2-1 through a series stabilized transmitter 20.

With the passage of the shadow of the orbit, or in violation of the orientation of duty 2 is powered by a rechargeable battery 4 1 -4 n through a bit device 6 1 -6 n .

Device control batteries 7 1 -7 n control voltage batteries rechargeable batteries 4 1 -4 n and transmit information about their condition in the load 2-1.

During operation KA, by results of the analysis of information on the state of the AB (mainly - voltage batteries and AB in General), logic hardware or planned in advance by the Board computer program is formed ban on all bit devices and stable series Converter.

After the restoration (partial or full) orientation of solar panels in the Sun after raising output voltage parallel stabilizer 3 to the nominal value is charged batteries. Banned bit device is removed after charging up to a certain level, and the ban on the work of the series stabilized voltage Converter 20 remove the sensor signal 19 current control SAT, after exceeding the current solar panels pre-determined value. The value of a preset value of a current security Council can be calculated from the ratio:

BS>(∑P SP /U SP +P ZAR /U ZAR )·n·k, where :

BS - current solar cells;

P SP - power series stable Converter;

U SP - load voltage stable series Converter;

P ZAR - power for charging of accumulator batteries;

U ZAR minimum charging voltage;

n is the number of accumulator batteries;

k - coefficient of linefill (taking account of converters, etc.) or based on the ratio:

BS>(∑P JV )k/U BS , where

BS - current solar panels, And;

P SP - power series stable Converter, W;

k - coefficient of linefill (taking account of converters, etc.);

U BS - rated voltage of the solar Century

Thus, the claimed method of management of the Autonomous power supply system of the spacecraft provides improved reliability SES at occurrence of emergency situations associated with an unplanned loss of orientation of the SPACECRAFT to the Sun.

1. The method of control of Autonomous power supply system of the spacecraft containing the solar battery and n battery, stabilizator voltage included between solar and load and n charge and discharge devices, consisting in the management of voltage and charge-discharge devices depending on the input and output voltage of the system, control level of charge and discharge batteries, ban the work of a proper charger when approaching extreme level a charge this battery pack, remove the ban on reaching a certain level of discharge this battery pack, the ban on the work of the relevant bit the device when approaching extreme level low battery charge this battery pack, remove the ban on reaching a certain level of charge this battery pack, while in case of loss of orientation of solar panels in the Sun, emergency battery discharge, prohibit (block) all bit devices, after restoring the orientation of solar panels in the Sun and charge the battery up to a specified level unlock all bit devices, characterized in that the electricity system with parallel stabilizer voltage solar panels and additional stabilization stress loads of smaller par value of tyres first load stable series converters are blocking the work of the data series stable converters, control the current solar panels, and releases the lock works stable series converters after exceeding the current solar panels pre-determined value.

2. The method of control of Autonomous power supply system of claim 1, characterized in that the block stable series converters removed after exceeding the current solar batteries values calculated from the ratio: BS>(∑P SP /U SP +P ZAR /U ZAR )·n·k, where I BS - current solar panels, And; P SP - power series stable Converter, W; U SP - load voltage stable series Converter, B; R ZAR - power for charging of accumulator batteries, W; U ZAR minimum charging voltage, W; n - number of batteries; k - the coefficient of linefill (taking account of converters, etc.).

3. The method of control of Autonomous power supply system of claim 1, characterized in that the block stable series converters removed after exceeding the current solar panels, calculated based on the ratio of: BS>(∑P JV )k/U BS where BS - current solar batteries, A; P SP - power series stable Converter, W; k - the coefficient of linefill (taking account of converters, etc.); U BS - rated voltage of the solar panels, B.

 

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