CN112436503B - High-voltage direct-current bus bar power control method in airplane high-voltage direct-current power supply system - Google Patents
High-voltage direct-current bus bar power control method in airplane high-voltage direct-current power supply system Download PDFInfo
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Abstract
The invention provides a high-voltage direct-current bus bar power control method in an airplane high-voltage direct-current power supply system, which judges the power supply state of the system according to the voltage information such as the bus bar voltage, the state information of auxiliary contacts of a power supply channel contactor and a bus bar connecting contactor, the state information and the fault information of a power supply channel and the priority of a system power supply mode, and switches the power supply channel according to a state switching control flow, thereby ensuring the reliable power supply of electric equipment. According to the state information of the system, the power supply channel switching in the running process of the system can be flexibly and reliably realized, and the position exchange in the left and right power distribution systems can be realized, so that the maintainability of the system is effectively improved, and the reliable power supply of the electric equipment is ensured.
Description
Technical Field
The invention belongs to the aviation electrical design technology, and relates to a high-voltage direct-current bus bar power control method in an airplane high-voltage direct-current power supply system.
Background
At present, the conversion control of a power supply channel in an airplane high-voltage direct-current power supply system is mainly realized by hardware interlocking of auxiliary contacts of a contactor. Meanwhile, the number of auxiliary contacts of the existing high-voltage direct-current contactor meeting the output power requirement of an aviation power supply system is small, so that the auxiliary contacts of the high-voltage direct-current contactor are often expanded by means of an external relay to realize complex channel conversion control logic, so that external hardware is complicated in wiring, and the control logic and algorithm are solidified through hardware, so that the control algorithm is difficult to further improve and optimize.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a power control method for a high-voltage direct-current bus bar, which can flexibly realize system reconstruction when a certain power system or other main components (such as a main power supply contactor and the like) have faults through an embedded software platform of a digital signal processor, is easy to control iterative optimization of logic and control algorithm, and improves the power supply reliability of electric equipment. Meanwhile, for a common multi-channel aviation power supply system, the method can realize position exchange in the left power distribution system and the right power distribution system, and the maintainability of the system is improved.
The technical scheme of the invention is as follows:
a high-voltage direct-current bus bar power control method in an airplane high-voltage direct-current power supply system comprises the following steps:
step 1: determining a power supply logic table of the system according to the power supply priority level of each power supply channel in the airplane high-voltage direct current power supply system;
step 2: determining the power supply state of the system according to the power supply logic table obtained in the step 1;
and step 3: determining a power supply state conversion mode according to the power supply state of the system obtained in the step 2;
and 4, step 4: determining a control flow corresponding to each power supply state conversion mode according to the power supply state conversion mode obtained in the step 3;
and 5: monitoring the power supply state of the airplane high-voltage direct-current power supply system, and performing power supply state change judgment;
and 6: if the power supply state is changed, go to step 7; otherwise, returning to the step 5;
and 7: performing power supply channel conversion control according to the control flow corresponding to the power supply state conversion mode obtained in the step 4;
and 8: and confirming the switching control result of the power supply channel.
Advantageous effects
According to the invention, through the bus bar power control device based on the embedded platform and the corresponding method design, the power supply channel switching in the system operation process can be flexibly and reliably realized according to the state information of the system, and meanwhile, the position exchange in the left and right power distribution systems can be realized, so that the maintainability of the system is effectively improved, and the reliable power supply of the electric equipment is ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic block diagram of channel switching control;
FIG. 2 is a dual channel HVDC system architecture;
FIG. 3 is a schematic diagram of a high voltage DC bus bar power control apparatus;
FIG. 4 power supply state transition diagram at ground level
FIG. 5 is a control flow diagram of the contactor without power supply → with power supplied from the left main generator
FIG. 6 is a flow chart of the control of the contactor for left main power generation + APU power supply → left main power generation + right main power generation
Fig. 7 shows a control flow chart of the contactor for left + right main power supply → ground power supply + left main power supply
FIG. 8 is a flow chart of contactor control for ground power supply → APU power supply
Detailed Description
The high-voltage direct-current bus bar power control method provided by the invention needs to be realized based on related hardware and comprises a bus bar voltage/interconnected bus bar voltage sampling circuit, a signal conditioning circuit, a power system normal operation state and fault state signal sampling circuit, a contactor auxiliary contact sampling circuit, an A/D conversion circuit, a level conversion circuit, a DSP (digital signal processor) processing unit, a communication unit, a contactor driving circuit and the like.
The bus bar voltage/interconnection bus bar voltage sampling circuit, the signal conditioning circuit and the A/D conversion circuit are used for realizing signal processing and information sampling of analog quantities such as bus bar voltage and interconnection bus bar voltage; the information processing of discrete quantities such as the auxiliary contact of the contactor, the normal operation state of the power system, the fault state of the power system and the like is realized through the auxiliary contact sampling circuit of the contactor, the normal operation state of the power system, the fault state of the power system and the like, so that the requirement of input/output level of an I/O port of a DSP (digital signal processor) can be met; the DSP processing unit monitors the input analog quantity and discrete quantity in real time and performs channel conversion control under the condition that a certain power channel is invalid so as to realize system reconstruction; the contactor driving circuit drives the contactor control signal of the DSP processing unit in power to meet the power requirement for driving the contactor to be connected; and the communication unit is used for interactively transmitting the state information and the fault information with the external information processing unit.
Based on the acquisition, control, drive and communication hardware, the following processes can be realized:
1. according to the voltage information such as the bus bar voltage, the state information of auxiliary contacts of a power channel contactor and a bus bar connecting contactor, the state information and the fault information of a power channel and the priority of a system power supply mode, judging the power supply state of a system, and switching a power supply channel according to a state switching control flow, so that the reliable power supply of electric equipment is guaranteed;
2. monitoring the state information of the system in real time;
3. and the mutual transmission of the state information and the fault information with the external information processing unit is realized according to the related communication protocol.
Based on the principle description, the method for controlling the power of the high-voltage direct-current bus bar in the airplane high-voltage direct-current power supply system comprises the following steps:
step 1: determining a power supply logic table of the system according to the power supply priority level of each power supply channel in the airplane high-voltage direct current power supply system;
step 2: determining the power supply state of the system according to the power supply logic table obtained in the step 1;
and step 3: determining a power supply state conversion mode according to the power supply state of the system obtained in the step 2;
and 4, step 4: determining a control flow corresponding to each power supply state conversion mode according to the power supply state conversion mode obtained in the step 3;
and 5: monitoring the power supply state of the airplane high-voltage direct-current power supply system, and performing power supply state change judgment;
step 6: if the power supply state is changed, go to step 7; otherwise, returning to the step 5;
and 7: performing power supply channel conversion control according to the control flow corresponding to the power supply state conversion mode obtained in the step 4;
and 8: and confirming the switching control result of the power supply channel.
In the above steps, steps 1 to 4 are implemented before actual power-on control, and after the high-voltage direct-current bus bar power control device is powered on, as shown in fig. 1, after the DSP operation state of the control device is initialized [1], initial state locking [2] of all contactors (including a power supply channel contactor and a bus bar connection contactor) is performed; continuously detecting voltage information [9] such as 270VDC high-voltage direct-current bus bar voltage, contactor auxiliary contact information [10], a power system operation normal state [11] and a power system fault state [12] through a power supply state detection [3] to judge a power supply state [4]; the power supply state judgment result is subjected to state locking through the power supply state locking [5] so as to ensure the complete conversion of the state conversion [6] of the power supply channel; after the control signal [7] is output and the power supply conversion result confirmation [8] is completed, the power supply state detection [3] is recycled.
The structure of the airplane double-main-channel high-voltage direct-current power supply system in the embodiment is shown in fig. 2, wherein ZF1 and ZF2 are a left main power supply system generator and a right main power supply system generator respectively, and GC1 and GC2 are a left main power supply channel contactor and a right main power supply channel contactor respectively; the APU is an auxiliary power supply system, and the APC is an auxiliary power supply channel contactor; EP is a ground power system, EPC is a ground power channel contactor; PBTC1 and PBTC2 are channel switching contactors.
A functional block diagram of the high voltage dc bus bar power control apparatus for dual main channel power supply shown in fig. 2 is shown in fig. 3. The high-voltage direct-current bus bar power control device outputs control signals of a power supply channel contactor and a bus bar connecting contactor when system power supply channel conversion is completed through real-time monitoring of main bus bar voltage, interconnection bus bar voltage, state information and fault information of a power supply system, auxiliary contacts of the contactor and the like according to control logic and a control flow, and the control signals realize on/off control of the power supply channel contactor and the bus bar connecting contactor through a power driving circuit.
For the power supply system architecture shown in fig. 2, including a left main power generation system (mainly composed of ZF1 main generator, GCU1, etc.), a right main power generation system (mainly composed of ZF2 main generator, GCU2, etc.), a ground power system EP, an APU auxiliary power system, etc., the following power supply priorities are agreed at first:
1) The main power supply of the channel has priority over other power supplies;
2) The ground power supply has priority over the auxiliary power supply and the main power supply on the other side;
3) The auxiliary power supply takes precedence over the other side main power supply.
The truth table of the power supply logic established according to the above agreed power supply priority is shown in table 1.
Table 1 power supply logic truth table
Then, the power supply states corresponding to the power supply system architecture shown in fig. 2 are obtained by summarizing and classifying the power supply states of the power supply logic truth table in table 1, which is shown in table 2.
TABLE 2 Power supply State
Therefore, for the power supply system architecture shown in fig. 2, the power supply states are as follows: the power supply system comprises a ground power supply (GEPS) state, an APU power supply (AEPS) state, a right main power generation and supply (REPS) state, a right main power generation and ground power supply (RGEPS) state, a right main power generation and APU power supply (RAEPS) state, a left main power generation and supply (LEPS) state, a left main power generation and ground power supply (LGEPS) APU state, a left main power generation and supply (LAEPS) state, a left main power generation and right main power generation and supply (LREPS) state, and nine power supply states.
During the ground state, the power supply state conversion follows the agreed power supply priority, and meanwhile, the following agreement is made for the power supply state conversion:
1) Only one power supply channel fault is considered during state conversion, namely only a single fault is considered at the moment of the fault, and multiple faults are not considered to occur simultaneously;
2) For the power supply channel with lower power supply priority, such as the main power generation system with the ground power supply and the APU system lower than the main power generation system of the channel, even if the power supply channel with higher power supply priority supplies power, the power supply channel with lower priority is considered to work, and only the bus bar is not supplied with power;
3) When the power supply channels with lower power supply priority supply power, and when the power supply channels with high priority return to normal, only the condition that one power supply channel returns to normal from a fault state is considered at the moment of returning to normal.
Therefore, in the ground state, for the power supply system architecture shown in fig. 2, the power supply state conversion relationship of the system obtained by performing power supply state conversion analysis according to the power supply state of the system is shown in fig. 4, and the specific conversion mode is shown as follows:
1) No power supply state → left main power generation and supply state;
2) Left main power supply state → no power supply state;
3) No power supply state → right main power generation and supply state;
4) Right main power generation state → no power supply state;
5) No power supply state → left main power generation + APU power supply state;
6) No power supply state → right primary power generation + APU power supply state;
7) No power supply state → ground power supply system power supply state;
8) The power supply state of the ground power supply system → the no power supply state;
9) No power supply state → the left main generator and the ground power supply;
10 No power supply state → right main power supply + ground power supply state;
11 No power supply state → left + right main power supply state;
12 No power state → APU power state;
13 APU powered state → unpowered state;
14 Left + right main hair → ground power supply + left main power supply state;
15 Left + right main hair → ground power supply + right main hair power supply state;
16 Left main power + ground power → left + right main power state;
17 Right main power + ground power → left + right main power supply status;
18 Left primary + ground power → left + APU powered state;
19 Main right + ground power → APU right power state;
20 Left primary + ground power → ground power supply state;
21 Right primary + ground power → ground power supply status;
22 Ground power → left primary + ground power supply state;
23 Ground power → right primary + ground power supply state;
24 Ground power → APU power state;
25 Left primary + APU → APU power state;
26 Right primary + APU → APU power state;
27 Left primary + APU → left primary power supply state;
28 Right primary + APU → right primary power state;
29 Left primary + APU → left primary + ground power supply state;
30 Main right transmission + APU → main right transmission + ground power supply state;
31 Left primary + APU → left + right primary power supply state;
32 Right primary + APU → left + right primary power supply state;
33 APU → left primary + APU power state;
34 APU → Right Primary + APU Power State;
35 APU → ground power system power state;
36 Right primary power supply state → right primary power supply + APU power supply state;
37 Right main power supply → right main power supply + ground power supply;
38 Left + right main power-on state → left main power-on state;
39 Left main power supply state → left main power supply + APU power supply state;
40 Left primary power supply state → left primary power supply state + ground power supply state;
41 Left main power supply state → left + right main power supply state.
In the air state, the power supply condition of the ground power supply channel is not considered, and the power supply state conversion mode can be analyzed and controlled by referring to the ground state.
For the above 41 power supply state transitions, four typical power supply state transitions are given here: the control flow of the power supply state → the left main power supply state, the left main power supply + APU power supply state → the left + right main power supply state, the left + right main power supply → the ground power supply + the left main power supply state, the ground power supply state → the APU power supply state, and the control flow of the other power supply state conversion is correspondingly carried out by referring to the control flow of the four typical power supply state conversions.
1) No power supply state → left main power generation and supply state
When the system is in a non-power supply state and receives a READY signal of the left main generator controller, the system is READY to enter a power supply state of the left main generator system. For the system architecture (fig. 2), a control flow block diagram of the system entering the left main power generation state from the no-power state is shown in fig. 5.
In the process of converting the state of no power supply → the state of left main power generation and power supply, power supply state locking and contactor state initialization are firstly carried out, voltage judgment of 270VDC BUS1 is carried out, if the voltage exists, fault detection and processing are carried out, otherwise, GC1 is closed, and the confirmation of BUS1 BUS voltage and the judgment of interconnection BUS voltage and BUS2 voltage are carried out to determine whether PBTC1 and PBTC2 are connected or not. If a fault occurs in the process of switching on the PBTC1 and the PBTC2, a corresponding fault detection process is carried out. The fault detection procedure in the contactor control flow diagram referred to in fig. 5 is as follows:
fault detection 1: giving corresponding delay time, if the BUS1 is not electrified, detecting the state of an auxiliary contact of the GC1, if the auxiliary contact is connected, reporting the connection fault of the GC1 and the BUS1 or the voltage detection fault of the BUS1, canceling the power supply state locking, and entering a non-power supply mode; if the auxiliary contact is not connected, a GC1 connection fault is reported, the power supply state locking is cancelled, and a non-power supply mode is entered. If BUS1 is electrified, the state that BUS1 is in the power-off judgment state is entered again.
And (3) fault detection 2: giving a waiting time delay, if detecting that the interconnection bus bar has normal voltage, exiting the power supply state conversion mode, and judging the power supply state again; otherwise, PBTC1 is closed.
And (3) fault detection: giving corresponding delay waiting, if the interconnection bus bar is not electrified, detecting the state of the PBTC1 auxiliary contact, if the auxiliary contact is attracted, reporting an interconnection bus bar voltage detection fault or a connection fault of the PBTC1 and the interconnection bus bar, and switching to a power supply mode to finish the conversion; if the auxiliary contact is not in the attraction state, the PBTC1 attraction fault is reported, and the power supply mode is switched to be ended; if the interconnection bus bar is electrified, the next flow is entered.
And 4, fault detection: giving a waiting time delay, if detecting that the BUS2 has normal voltage, exiting the power supply conversion mode, and judging the power supply state again; otherwise, PBTC2 is closed.
And (5) fault detection: giving corresponding delay time, if the BUS2 is not electrified, detecting the state of the PBTC2 auxiliary contact, if the auxiliary contact is attracted, reporting the connection fault of the PBTC2 and the BUS2 or the voltage detection fault of the BUS2, disconnecting the PBTC2 and the PBTC1, and finishing power supply conversion; if the auxiliary contact is not attracted, the PBTC2 attraction fault is reported, the PBTC1 is disconnected, and the power supply conversion is finished. If BUS2 has power after waiting for the delay, the power supply conversion is finished.
2) Left main power generation + APU power supply state → left + right main power generation system power supply state
When the system is in a left main power generation + APU power supply state and receives a READY signal of the right main generator controller, the system is READY to enter a left main power generation system + right main power generation system power supply state. For the system architecture (shown in fig. 2), a control flow block diagram of the system entering the left + right main power generation system power supply state from the left main power generation + APU power supply state is shown in fig. 6.
When the power supply state of the left main generator + APU power supply state → the power supply state of the left main generator system and the right main generator system is converted, after the contactor APC and the PBTC2 are disconnected, the existence of voltage of the BUS2 is judged, if the voltage of the BUS2 is normal after given time delay, the power supply conversion mode is exited, and the power supply state judgment is carried out again; otherwise, contactor GC2 is closed. After waiting for the time delay, if the BUS2 has no voltage, detecting the state of the auxiliary contact of the GC2, and if the auxiliary contact is closed, reporting the connection fault of the GC2 and the BUS2 or the voltage detection fault of the BUS 2; and if the auxiliary contact is disconnected, reporting a GC2 pull-in fault, disconnecting the GC2 and finishing power supply conversion. If BUS2 has power after waiting for the delay, the power supply conversion is finished.
3) Left + right main power generation and supply state → ground power supply + left main power generation and supply state
When the system is in a left and right main power generation and supply state and receives a fault signal of a generator controller of the right power generation system, the system exits from the left and right main power generation and supply state and is converted to a ground power supply and left main power generation and supply state. The flow chart of the control is shown in fig. 7.
During the process of switching the left + right main power → ground power + left main power supply state, the contactor GC2 is firstly disconnected, and the pull-in control of the contactors EPC and PBTC2 is performed. In the process of switching the power supply mode, the related fault detection process is as follows:
fault detection 1: detecting the states of auxiliary contacts of PBTC1, PBTC2, APC, EPC and GC2 contactors, if the auxiliary contacts are all disconnected, reporting an interconnection bus bar to detect faults, and finishing power supply conversion; and if the bus is not disconnected, the bus is disconnected, and whether the next flow is switched to or the power supply conversion is finished is determined according to the voltage detection result of the interconnection bus.
And (3) fault detection 2: giving waiting time delay, detecting the state of an EPC auxiliary contact if the interconnection bus bar is not electrified, reporting a connection fault of the EPC and the interconnection bus bar or a voltage detection fault of the interconnection bus bar if the auxiliary contact is closed, disconnecting the EPC, and finishing power supply conversion; if the auxiliary contact is disconnected, an EPC connection fault is reported, and power supply conversion is finished. If the interconnection BUS bar is electrified after waiting for the delay, the BUS2 voltage detection process is started.
And (3) fault detection: and giving corresponding time delay, if the BUS2 has voltage, disconnecting the EPC and finishing power supply conversion.
And 4, fault detection: giving waiting time delay, if the BUS2 is not electrified, detecting the state of the PBTC2 auxiliary contact, if the auxiliary contact is closed, reporting a connection fault between the PBTC2 and the BUS2 or a voltage detection fault of the BUS2, disconnecting EPC and PBTC2, and finishing power supply conversion; if the auxiliary contact is disconnected, the PBTC2 is reported to be in a fault, the EPC and the PBTC2 are disconnected, and the power supply conversion is finished. If the BUS2 is powered after waiting for the delay, the power supply conversion is finished.
4) Ground power supply state → APU power supply state
When the system is in a ground power supply state and the ground power supply fails, the system enters an APU power supply state. A specific power supply state transition control flow block diagram is shown in fig. 8.
In fig. 8, when the ground power supply state → APU power supply state is switched, the EPC is controlled to be turned off and the APC is controlled to be turned on. In the conversion process, the related fault detection processes are as follows:
fault detection 1: giving a waiting time delay, if the interconnection bus bar is electrified, judging the states of the auxiliary contacts of GC1, GC2 and APC, if the auxiliary contacts are disconnected, reporting a voltage detection fault of the interconnection bus bar, and exiting from a power supply conversion mode; if the power supply state is not disconnected, the power supply mode conversion is quitted, and the power supply state judgment is carried out again. If the bus bar is dead, the APC is closed.
And (3) fault detection 2: giving delay time, if the APC auxiliary contact is not connected, checking the voltage conditions of BUS1 and BUS2, if no electricity exists, reporting the APC fault, disconnecting PBTC1 and PBTC2, and finishing power supply conversion; if the BUS1 and the BUS2 are electrified, the fault of the APC auxiliary contact is reported, and the power supply conversion is finished.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (1)
1. A high-voltage direct-current bus bar power control method in an airplane high-voltage direct-current power supply system is characterized by comprising the following steps: the method comprises the following steps:
step 1: determining a power supply logic table of the system according to the power supply priority level of each power supply channel in the airplane high-voltage direct current power supply system;
the airplane high-voltage direct-current power supply system is of a double-main-channel high-voltage direct-current power supply system structure and is provided with a left main power generation system, a right main power generation system, a ground power supply system and an auxiliary power supply system on the ground;
the power supply priority level is as follows: (1) the main power supply of the channel has priority over other power supplies; (2) The ground power supply has priority over the auxiliary power supply and the main power supply on the other side; (3) the auxiliary power supply takes precedence over the main power supply on the other side;
the power supply logic table of the system is as follows:
wherein: 0 indicates that the channel power supply is invalid, and 1 indicates that the channel power supply is valid; ● The contactor is in pull-in and coil power-on states; o indicates that the contactor is released and the coil is not energized; ZF1 represents a left main generator, ZF2 represents a right main generator, APU represents an auxiliary power system, and EP represents a ground power system; GC1 and GC2 are respectively a left main power supply channel contactor and a right main power supply channel contactor; APC is an auxiliary power supply channel contactor; EPC is a ground power channel contactor; PBTC1 and PBTC2 are channel conversion contactors;
step 2: determining the power supply state of the system according to the power supply logic table obtained in the step 1;
the power supply state of the system is as follows:
The resulting power supply states are: a ground power supply (GEPS) state, an APU power supply (AEPS) state, a right main power generation and supply (REPS) state, a right main power generation and ground power supply (RGEPS) state, a right main power generation and APU power supply (RAEPS) state, a left main power generation and supply (LEPS) state, a left main power generation and ground power supply (LGEPS) APU state, a left main power generation and supply (LAEPS) state, a left main power generation and right main power generation and supply (LREPS) state, and nine power supply states in total;
and step 3: determining a power supply state conversion mode according to the power supply state of the system obtained in the step 2;
the power supply state conversion mode is as follows:
1) No power supply state → left main power generation and supply state;
2) Left main power supply state → no power supply state;
3) No power supply state → right main power generation and supply state;
4) Right main power generation state → no power supply state;
5) No power supply state → left main power generation + APU power supply state;
6) No power supply state → right primary power generation + APU power supply state;
7) No power supply state → ground power supply system power supply state;
8) The power supply state of the ground power supply system → the power supply-free state;
9) No power supply state → the left main generator and the ground power supply;
10 No power supply state → right main power supply state + ground power supply state;
11 No power supply state → left + right main power supply state;
12 No power state → APU power state;
13 APU powered state → unpowered state;
14 Left + right main power → ground power + left main power supply state;
15 Left + right main hair → ground power supply + right main hair power supply state;
16 Left main power + ground power → left + right main power state;
17 Right main power + ground power → left + right main power supply status;
18 Left primary + ground power → left + APU powered state;
19 Right primary + ground power → right + APU power state;
20 Left primary + ground power → ground power supply state;
21 Right primary + ground power → ground power supply status;
22 Ground power → left primary + ground power supply state;
23 Ground power → right primary + ground power supply state;
24 Ground power → APU powered state;
25 Left primary + APU → APU power state;
26 Right primary + APU → APU power state;
27 Left primary + APU → left primary power supply state;
28 Right primary + APU → right primary power state;
29 Left primary + APU → left primary + ground power supply state;
30 Right primary + APU → right primary + ground power supply state;
31 Left primary + APU → left + right primary power supply state;
32 Right primary + APU → left + right primary power supply state;
33 APU → left primary + APU power state;
34 APU → Right Primary + APU Power State;
35 APU → ground power system power state;
36 Right primary power supply state → right primary power supply + APU power supply state;
37 Right main power supply → right main power supply + ground power supply;
38 Left + right main power state → left main power state;
39 Left primary power supply state → left primary power supply + APU power supply state;
40 Left primary power supply state → left primary power supply + ground power supply state;
41 Left main power generation and supply state → a left and right main power generation and supply state;
41 power supply state conversion modes are provided;
and 4, step 4: determining a control flow corresponding to each power supply state conversion mode according to the power supply state conversion mode obtained in the step 3;
the control flow of the no power supply state → left main power generation and supply state conversion mode is as follows:
when the system is in a non-power supply state and receives a READY signal of the left main generator controller, the system is READY to enter a power supply state of the left main generator system;
in the process of converting the power supply state → the left main power generation and supply state, firstly, power supply state locking and contactor state initialization are carried out, voltage judgment of 270VDC BUS1 is carried out, if voltage exists, fault detection and processing are carried out, otherwise, GC1 is closed, and the voltage of BUS1 BUS and the voltage of interconnection BUS and BUS2 are confirmed to determine whether PBTC1 and PBTC2 are to be connected or not; in the process of switching on the PBTC1 and the PBTC2, if a fault occurs, entering a corresponding fault detection flow; the fault detection flow is as follows:
fault detection 1: giving corresponding delay time, if the BUS1 is not electrified, detecting the state of an auxiliary contact of the GC1, if the auxiliary contact is connected, reporting the connection fault of the GC1 and the BUS1 or the voltage detection fault of the BUS1, canceling the locking of the power supply state, and entering a non-power supply mode; if the auxiliary contact is not connected, reporting a GC1 connection fault, canceling power supply state locking, and entering a non-power supply mode; if the BUS1 is electrified, the state that the BUS1 is in the power-off judgment state is entered again;
and (3) fault detection 2: giving a waiting time delay, if detecting that the interconnection bus bar has normal voltage, exiting the power supply state conversion mode, and judging the power supply state again; otherwise, closing the PBTC1;
and (3) fault detection: giving corresponding delay waiting, if the interconnection bus bar is not electrified, detecting the state of the PBTC1 auxiliary contact, if the auxiliary contact is attracted, reporting an interconnection bus bar voltage detection fault or a connection fault of the PBTC1 and the interconnection bus bar, and switching to a power supply mode to finish the conversion; if the auxiliary contact is not in the attraction state, the PBTC1 attraction fault is reported, and the power supply mode is switched to be ended; if the interconnection bus bar is electrified, entering the next process;
and 4, fault detection: giving a waiting time delay, if detecting that the BUS2 has normal voltage, exiting the power supply conversion mode, and judging the power supply state again; otherwise, closing the PBTC2;
and (5) fault detection: then, corresponding delay time is given, if the BUS2 is not electrified, the state of the PBTC2 auxiliary contact is detected, if the auxiliary contact is attracted, a connection fault between the PBTC2 and the BUS2 or a voltage detection fault of the BUS2 is reported, the PBTC2 and the PBTC1 are disconnected, and power supply conversion is finished; if the auxiliary contact is not attracted, the PBTC2 attraction fault is reported, the PBTC1 is disconnected, and the power supply conversion is finished; if the BUS2 is electrified after waiting for the delay, the power supply conversion is finished;
the control flow of the switching mode of the left main power generation + APU power supply state → the left and right main power generation system power supply states is as follows:
when the system is in a left main power generation + APU power supply state and receives a READY signal of a right main generator controller, the system is READY to enter a left main power generation system + right main power generation system power supply state;
when the power supply state of the left main generator + APU power supply state → the power supply state of the left main generator system and the right main generator system is converted, after the contactor APC and the PBTC2 are disconnected, the existence of voltage of the BUS2 is judged, if the voltage of the BUS2 is normal after given time delay, the power supply conversion mode is exited, and the power supply state judgment is carried out again; otherwise, closing the contactor GC2; after waiting for the time delay, if the BUS2 has no voltage, detecting the state of the auxiliary contact of the GC2, and if the auxiliary contact is closed, reporting the connection fault of the GC2 and the BUS2 or the voltage detection fault of the BUS 2; if the auxiliary contact is disconnected, a GC2 pull-in fault is reported, the GC2 is disconnected, and power supply conversion is finished; if the BUS2 is electrified after waiting for the delay, the power supply conversion is finished;
the control flow of the left and right main power generation and supply state → ground power supply and left main power generation and supply state conversion mode is as follows:
when the system is in a left and right main power generation and supply state and receives a fault signal of a generator controller of a right power generation system, the system exits from the left and right main power generation and supply state and is converted to a ground power supply and left main power generation and supply state;
during the process of switching the power supply states of the left main power generation, the right main power generation, the ground power supply and the left main power generation, the contactor GC2 is disconnected, and the attraction control of the contactor EPC and the PBTC2 is performed; in the process of switching the power supply mode, the related fault detection process is as follows:
fault detection 1: detecting the states of auxiliary contacts of PBTC1, PBTC2, APC, EPC and GC2 contactors, if the auxiliary contacts are all disconnected, reporting an interconnection bus bar to detect faults, and finishing power supply conversion; if the voltage of the interconnection bus bar is not disconnected, the interconnection bus bar is disconnected, and whether the next flow is switched to or the power supply conversion is finished is determined according to the voltage detection result of the interconnection bus bar;
and (3) fault detection 2: giving a waiting delay, detecting the state of an EPC auxiliary contact if the interconnection bus bar is not electrified, reporting a connection fault of the EPC and the interconnection bus bar or a voltage detection fault of the interconnection bus bar if the auxiliary contact is closed, disconnecting the EPC, and finishing power supply conversion; if the auxiliary contact is disconnected, an EPC connection fault is reported, and power supply conversion is finished; if the interconnection BUS bar is electrified after waiting for the time delay, entering a BUS2 voltage detection process;
and (3) fault detection: giving corresponding time delay, if BUS2 has voltage, disconnecting EPC, and finishing power supply conversion;
and 4, fault detection: giving a waiting delay, detecting the state of the PBTC2 auxiliary contact if the BUS2 is not electrified, reporting a connection fault between the PBTC2 and the BUS2 or a voltage detection fault of the BUS2 if the auxiliary contact shows to be closed, disconnecting the EPC and the PBTC2, and finishing power supply conversion; if the auxiliary contact is disconnected, the PBTC2 is reported to be in fault, the EPC and the PBTC2 are disconnected, and the power supply conversion is finished; if the BUS2 is electrified after waiting for the delay, the power supply conversion is finished;
the control flow of the ground power supply state → APU power supply state conversion mode is as follows:
when the system is in a ground power supply state and the ground power supply fails, the system enters an APU power supply state;
when the ground power supply state → APU power supply state is converted, the EPC is controlled to be disconnected and the APC is controlled to be closed; in the conversion process, the related fault detection processes are as follows:
fault detection 1: giving a waiting time delay, if the interconnection bus bar is electrified, judging the states of the auxiliary contacts of GC1, GC2 and APC, if the auxiliary contacts are disconnected, reporting a voltage detection fault of the interconnection bus bar, and exiting from a power supply conversion mode; if the power supply state is not disconnected, the power supply mode conversion is quitted, and the power supply state judgment is carried out again; closing the APC if the bus bar is dead;
and (3) fault detection 2: giving delay time, if the APC auxiliary contact is not connected, checking the voltage conditions of BUS1 and BUS2, if no electricity exists, reporting the APC fault, disconnecting PBTC1 and PBTC2, and finishing power supply conversion; if the BUS1 and the BUS2 are electrified, the fault of the APC auxiliary contact is reported, and the power supply conversion is finished;
and 5: monitoring the power supply state of the airplane high-voltage direct-current power supply system, and performing power supply state change judgment;
step 6: if the power supply state is changed, go to step 7; otherwise, returning to the step 5;
and 7: performing power supply channel conversion control according to the control flow corresponding to the power supply state conversion mode obtained in the step 4;
and 8: and confirming the switching control result of the power supply channel.
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