Power generation system dc oil pump control circuit and method

Abstract

The disclosure provides a direct-current oil pump control circuit and method in a power generation system, the direct-current oil pump control circuit comprising: a direct-current oil pump auxiliary starting circuit arranged between a control mode selection circuit and a starting coil branch, the direct-current oil pump auxiliary starting circuit being used for receiving and responding to a demand instruction of the power generation system, controlling the direct-current oil pump control circuit of the power generation system to work under a corresponding demand instruction, and connecting the control mode selection circuit and the starting coil branch to start the direct-current oil pump when a lubricating oil main pipe pressure of the power generation system is abnormal; wherein the control mode selection circuit is used for selecting a control mode of a main machine as a maintenance, remote or on-site control mode; the starting coil branch comprises a starting contactor coil, and is used for closing a normally open contact point of the starting contactor under the condition that the starting contactor coil is powered on, so as to start the direct-current oil pump. The risk of failure of the direct-current oil pump starting in the case of failure of the alternating-current oil pump is reduced, and the reliability of the system is improved.

Description

Technical Field

[0001] This disclosure relates to the field of new energy technology, and more specifically, to a DC oil pump control circuit and method for a power generation system. Background Technology

[0002] In related technologies, the turbine lubrication system provides lubrication and cooling for mechanical components such as bearings within the turbine. If the lubrication is interrupted or the pressure is very low while the turbine is rotating, it can cause damage to these components, leading to equipment accidents. Typically, an AC lubrication pump and a DC lubrication pump are installed. Whether the AC and DC pumps are activated simultaneously when the lubrication pressure drops directly determines the safe operation of the turbine. Similarly, the same applies to the compressor lubrication system.

[0003] In the field of physical energy storage, such as carbon dioxide two-phase energy storage systems, the equipment using lubricating oil includes turbines and compressors. If the turbine lubricating oil system and the compressor lubricating oil system are equipped with separate lubricating oil stations, it will increase the construction cost of the lubricating oil stations. If the turbine lubricating oil system and the compressor lubricating oil system share the same lubricating oil station, since the turbine and compressor in physical energy storage systems such as carbon dioxide two-phase energy storage systems operate intermittently and require frequent start-stop operations, a reliable and convenient DC oil pump control method will greatly improve the safety and convenience of operation of carbon dioxide two-phase energy storage systems. However, the existing technology has not yet proposed a DC oil pump hard-start scheme for intermittently operating turbines and compressors sharing the same lubricating oil station.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a DC oil pump control circuit and method for a power generation system, which can operate the DC oil pump control circuit of the power generation system under the corresponding demand command, and connect the control mode selection circuit with the starting coil branch when the lubricating oil main pipe pressure of the power generation system is abnormal, so as to start the DC oil pump in conjunction, thereby reducing the risk of failure of DC oil pump in conjunction when AC oil pump fails, and the reliability is also higher.

[0006] In a first aspect, embodiments of this disclosure provide a DC oil pump control circuit, including:

[0007] A DC oil pump auxiliary starting circuit is set between the control mode selection circuit and the starting coil branch. It is used to receive and respond to the demand command of the power generation system, control the DC oil pump control circuit of the power generation system to work under the corresponding demand command, and when the pressure of the lubricating oil main pipe of the power generation system is abnormal, connect the control mode selection circuit and the starting coil branch to start the DC oil pump.

[0008] The control mode selection circuit is used to select the control mode of the DC oil pump of the power generation system as maintenance, remote or local control mode; the starting coil branch includes a starting contactor coil, which is used to close the normally open contact of the starting contactor when the starting contactor coil is energized, so as to start the DC oil pump.

[0009] Secondly, embodiments of this disclosure provide a DC oil pump control method in a power generation system, including:

[0010] The DC oil pump auxiliary start circuit receives and responds to the demand command of the power generation system, connects the control mode selection circuit of the DC oil pump control circuit to the start coil branch, controls the DC oil pump control circuit of the power generation system to work under the corresponding demand command, and when the pressure of the lubricating oil main pipe of the power generation system is abnormal, connects the control mode selection circuit to the start coil branch to start the DC oil pump.

[0011] The control mode selection circuit is used to select the control mode of the power generation system as maintenance, remote or local control mode; the starting coil branch includes a starting contactor coil, which is used to close the normally open contact of the starting contactor when the starting contactor coil is energized, so as to start the DC oil pump.

[0012] In this embodiment, an auxiliary starting circuit for the DC oil pump, located between the control mode selection circuit and the starting coil branch in the control circuit of the DC oil pump, receives and responds to the demand command from the power generation system. When the DC oil pump control circuit of the power generation system operates under the corresponding demand command, the control mode selection circuit is connected to the starting coil branch to initiate the DC oil pump's interlocking start. Therefore, under the premise that different types of main units share the same lubrication station, the interlocking of the main unit's DC oil pump pipeline, under the demand command of the power generation system, can switch to the main unit's DC oil pump pipeline interlocking operation under the demand command of the power generation system. This enables the interlocking start of the main unit's DC oil pump under the demand command of the power generation system, reducing the risk of DC oil pump interlocking failure in the event of AC oil pump failure and improving the reliability of the power generation system.

[0013] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0015] Figure 1 This is a simplified system diagram of a lubricating oil in a carbon dioxide energy storage and power generation system according to an exemplary embodiment of the present disclosure.

[0016] Figure 2 This is a schematic diagram of the composition and structure of a DC oil pump control circuit in a power generation system according to an exemplary embodiment of the present disclosure.

[0017] Figure 3 This is a schematic diagram of the composition structure of a DC oil pump control circuit in a power generation system according to another exemplary embodiment of the present disclosure.

[0018] Figure 4 A schematic diagram of the composition structure of a DC oil pump control circuit in a power generation system according to another exemplary embodiment of this disclosure.

[0019] Figure 5 This is a schematic diagram illustrating the implementation process of a DC oil pump control method in a power generation system according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0020] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this disclosure more comprehensive and complete, and to fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced with one or more of the specific details omitted, or other methods, components, apparatus, steps, etc., can be employed. In other instances, well-known technical solutions are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0021] Furthermore, the accompanying drawings are merely illustrative of this disclosure, and the same reference numerals in the drawings denote the same or similar parts, thus repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0022] The DC oil pump control circuit and method of the power generation system provided in this disclosure will be described in detail below with reference to the accompanying drawings.

[0023] In related technologies, carbon dioxide energy storage systems consist of two main units (one can be a turbine, and the other can be a compressor). The rotating shafts and other mechanical components in both main units require lubricating oil for lubrication and cooling. To save on construction costs, lubricating oil is supplied to both different main units through a single lubrication station.

[0024] This disclosure provides a DC oil pump control circuit for a power generation system. This DC oil pump control circuit can be applied to a power generation system including multiple main units (this disclosure uses a carbon dioxide energy storage power generation system as an example, which may include two main units: a generator (which may be a turbine) and an energy storage main unit (which may be a compressor)). It supplies lubricating oil to the main units via a DC oil pump in the same oil station. Here, the same oil station also includes an AC oil pump, and under normal operating conditions, the DC oil pump does not work; it only starts working when the AC oil pump fails.

[0025] Figure 1 This is a simplified system diagram of a lubricating oil in a carbon dioxide energy storage and power generation system according to an exemplary embodiment of the present disclosure.

[0026] like Figure 1 As shown, the carbon dioxide energy storage power generation system includes an energy release host 101, an energy storage host 102, an AC oil pump 103 and a DC oil pump 104 in an oil station. An oil valve 105 is installed on the energy release host 101 side, which can be manually opened or closed to allow lubricating oil from the AC oil pump 103 or the DC oil pump 104 to enter or prevent it from entering the energy release host 101. An oil valve 106 is also installed on the energy storage host 102 side, which can be manually opened or closed to allow lubricating oil from the AC oil pump 103 or the DC oil pump 104 to enter or prevent it from entering the energy storage host 102. Simultaneously, a pressure switch 107 is installed on the energy release host 101 side, which closes due to the pressure reduction when the oil valve 105 is closed. A pressure switch 108 is also installed on the energy storage host 102 side, which closes due to the pressure reduction when the oil valve 106 is closed.

[0027] The lubricating oil header of the power generation system includes a lubricating oil header for a first type of main unit (such as an energy release main unit 101) and a lubricating oil header for a second type of main unit (such as an energy storage main unit 102). Since the first type of main unit and the second type of main unit share the same lubricating oil station, two different lubricating oil headers are led out from the lubricating oil station on the oil valve 105 side and the oil valve 106 side, respectively. One is connected between the energy release main unit 101 and the oil valve 105, and the other is connected between the energy storage main unit 102 and the oil valve 106. A pressure switch 107 is installed on the lubricating oil header between the energy release main unit 101 and the oil valve 105 to detect the pressure of the lubricating oil header of the first type of main unit. A pressure switch 108 is installed on the lubricating oil header between the energy storage main unit 102 and the oil valve 106 to detect the pressure of the lubricating oil header of the second type of main unit.

[0028] Figure 2 This is a schematic diagram of the composition of the control circuit of a DC oil pump in a power generation system according to an exemplary embodiment of the present disclosure.

[0029] like Figure 2 As shown, the DC oil pump control circuit 20 of the power generation system in this embodiment may include a DC oil pump auxiliary start circuit 201.

[0030] The DC oil pump auxiliary start circuit 201 can be set between the control mode selection circuit 202 and the start coil branch 203. It can be used to receive and respond to the demand command of the power generation system, control the DC oil pump control circuit of the power generation system to work under the corresponding demand command, and when the pressure of the lubricating oil main pipe of the power generation system is abnormal, the control mode selection circuit 202 and the start coil branch 203 will be connected to start the DC oil pump.

[0031] The control mode selection circuit 202 can be used to select the control mode of the DC oil pump of the power generation system as maintenance, remote or local control mode; the starting coil branch 203 can refer to the branch used to start the contactor for controlling the operation of the DC oil pump, and can include the starting contactor (which can be represented by KM1 in this disclosure) coil 2031. When the coil 2031 of the starting contactor KM1 is energized, the normally open contact 200 of the starting contactor KM1 can be closed to start the DC oil pump.

[0032] Here, when the power generation system is a carbon dioxide energy storage power generation system, and includes a turbine and a compressor, the main unit's operating conditions can include energy storage mode (which corresponds to the compressor working and the turbine not working), energy release mode (which corresponds to the compressor not working and the turbine working), and dual-start mode (which corresponds to both the compressor and the turbine working). The normally open contact 200 of the starting contactor KM1, the control mode selection circuit 202, and the starting coil branch 203 can also be the circuit in the control circuit 20 of the DC oil pump in the power generation system.

[0033] The demand commands for the power generation system include the activation or deactivation of the DC oil pump pipeline interlocking status under different operating conditions and control modes. For example, in remote control mode and energy storage mode, the compressor DC oil pump pipeline interlocking status of the power generation system is activated, while the turbine DC oil pump pipeline interlocking status is deactivated; in remote control mode and energy release mode, the turbine DC oil pump pipeline interlocking status is activated, while the compressor DC oil pump pipeline interlocking status is deactivated; in remote control mode and dual-operation mode, both the turbine and compressor DC oil pump pipeline interlocking statuses are activated; in local control mode, the DC oil pump pipeline interlocking status is activated; and in maintenance control mode, the DC oil pump pipeline interlocking status is deactivated.

[0034] The lubrication station is equipped with AC oil pumps and DC oil pumps. The power generation system is equipped with a DC oil pump control circuit. The DC oil pump is activated when the pressure of the lubrication oil header of the turbine or compressor is low to supply lubrication oil to the turbine or compressor.

[0035] With frequent start-ups and shutdowns of different main units in the energy storage system, the operating mode of the lubrication system also needs to be frequently switched, and the operating frequency of the DC oil pump will also increase accordingly. When the lubrication system of all main units stops operating or the lubrication of the non-operating main unit needs to be cut off, the interlock of the DC oil pump pipeline of the non-operating main unit must be disconnected before the supply of lubrication oil to the non-operating main unit can be stopped. Since the operating and non-operating main units in the energy storage system share the DC oil pump, there is a risk of failure of the AC oil pump and failure of the DC oil pump interlock. This application solves the problem by setting up an auxiliary start circuit for the DC oil pump to achieve the disconnection of the DC oil pump pipeline interlock of the non-operating main unit and the engagement of the DC oil pump pipeline interlock of the operating main unit, which greatly reduces the risk of failure of the AC oil pump and failure of the DC oil pump interlock.

[0036] In an exemplary embodiment of this disclosure, the control circuit of the DC oil pump in the power generation system may further include a local DC oil pump starting circuit 206 (located on the oil station side) and a distributed control circuit 204 disposed between the control mode selection circuit 202 and the starting coil branch 203.

[0037] In one possible implementation, the operation of the first type of host and the second type of host can be an externally input manual operation. The first type of host of the power generation system operates in energy storage mode, and the second type of host of the power generation system operates in energy release mode. For example, when the host operating mode switching operation is manually switched to the energy storage mode of the power generation system, the first type of host of the power generation system operates, and the first type of host operates in energy storage mode.

[0038] It is understood that the input terminal of the control mode selection circuit 202 can be connected to the positive terminal of the DC oil pump's operating power supply voltage (outputting the first power supply voltage, which can be a 220V DC voltage, referred to as DC220+ in this disclosure), and the first output terminal of the control mode selection circuit 202 can be connected to the local DC oil pump starting circuit 206 to transmit the first power supply voltage DC220V+ to the local DC oil pump starting circuit 206 as the input power supply for the local DC oil pump starting circuit 206. When the local DC oil pump starting circuit 206 controls the DC oil pump to start, the input first power supply voltage DC220V+ is transmitted to the starting coil branch 203, energizing the coil 2031 of the starting contactor KM1, and the normally open contact of the starting contactor KM1... When 200 is closed, the DC oil pump is started. The second output terminal of the control mode selection circuit 202 can be connected to the DC oil pump auxiliary start circuit 201 to transmit the first power supply voltage DC220+ to the DC oil pump auxiliary start circuit 201 as the input power supply for the DC oil pump auxiliary start circuit 201. When the pressure of the generator main unit is abnormal, the DC oil pump auxiliary start circuit 201 can transmit the input first power supply voltage DC220V+ to the start coil branch 203, so that the coil 2031 of the start contactor KM1 is energized and the normally open contact 200 of the start contactor KM1 is closed to start the DC oil pump.

[0039] The second output terminal of the control mode selection circuit 202 can also be connected to the distributed control circuit 204 to transmit the first power supply voltage DC220+ to the distributed control circuit 204 as the input power supply for the distributed DC oil pump control circuit. When the distributed control circuit 204 controls the DC oil pump to start, the input first power supply voltage DC220V+ is transmitted to the starting coil branch 203, so that the coil 2031 of the starting contactor KM1 is energized and the normally open contact 200 of the starting contactor KM1 is closed to start the DC oil pump.

[0040] In one possible implementation, the start coil branch 203 may include not only the coil 2031 of the start contactor KM1, but also the normally closed contact 2032 of the stop contactor (represented by KC2 in this disclosure) and an indicator light 2033 (represented by L1 in this disclosure) for displaying the operating status of the DC oil pump.

[0041] In some embodiments of this disclosure, one end of the normally closed contact 2032 of the stop contactor KC2 can serve as a common connection terminal, simultaneously connecting the DC oil pump auxiliary starting circuit 201, the local DC oil pump starting circuit 206, and the distributed control circuit 204. The other end can be connected to the negative terminal of the DC oil pump's operating power supply voltage (the second power supply voltage, denoted as DC220- in this disclosure) through the coil 2031 of the starting contactor KM1. The indicator light 2033 for the DC oil pump's operating status can be connected in parallel with the coil 2031 of the starting contactor KM1, so that when the coil 2031 of the starting contactor KM1 is energized, the indicator light 2033 for the DC oil pump's operating status is also energized, indicating that the DC oil pump is in operation. Here, when the indicator light 2033 for the DC oil pump's operating status is lit, it indicates that the DC oil pump pipeline is engaged and the DC oil pump is in operation; when the indicator light 2033 for the DC oil pump's operating status is off, it indicates that the DC oil pump pipeline is disconnected and the DC oil pump is in a stopped state.

[0042] In the embodiments of this disclosure, when the coil 2031 of the starting contactor KM1 is energized (the current is greater than the preset coil current), the normally closed contact of the starting contactor KM1 opens, and the normally open contact 200 of the starting contactor KM1 (which can control the start-up of the DC oil pump) closes, thus enabling the start-up of the DC oil pump.

[0043] In some embodiments of this disclosure, reference is made to Figure 3 As shown, the DC oil pump auxiliary start circuit 201 may include a working condition display circuit 2010 and a first pressure detection switch 2012 (corresponding to...). Figure 1 The pressure switch 107 (referred to as PS1 in this disclosure), and the second pressure detection switch 2013 (corresponding to) Figure 1 The pressure switch 108 (referred to as PS2 in this disclosure) and the double-throw switch 2017 (referred to as S1 in this disclosure) are included.

[0044] The operating condition display circuit 2010 has its first input terminal connected to the first output terminal of the control mode selection circuit 202.

[0045] The first pressure detection switch 2012 has its first end connected to the first output end of the operating condition display circuit 2010, and its second end connected to the start coil branch 203.

[0046] It is understood that the first pressure detection switch 2012 can close when the detected pressure value is less than a first preset pressure value. The first preset pressure value can be obtained from the inherent characteristics of the switch defined in the datasheet. Meanwhile, the condition for the first pressure detection switch 2012 to decrease can be... Figure 1 The oil valve 105 in the middle is shut off.

[0047] The second pressure detection switch 2013 has its first end connected to the second output end of the operating condition display circuit 2010, and its second end connected to the start coil branch 203.

[0048] It is understood that the second pressure detection switch 2013 can close when the detected pressure value is less than a second preset pressure value. The second preset pressure value may or may not be equal to the first preset pressure value. The second preset pressure value can be obtained from the inherent characteristics of the switch defined in the datasheet. Furthermore, the condition for the second pressure detection switch 2013 to decrease can be... Figure 1 The oil valve 106 in the middle is shut off.

[0049] In one exemplary implementation, reference continues to... Figure 3 The main unit of the power generation system may include a first type of main unit and a second type of main unit. The pressure abnormality of the main unit of the power generation system includes a first pressure abnormality of the lubricating oil header of the first type of main unit and a second pressure abnormality of the lubricating oil header of the second type of main unit.

[0050] Here, the first type of host can be an energy storage host (such as a compressor), and the second type of host can be an energy release host (such as a turbine).

[0051] The operating status display circuit 2010 can be used to receive and respond to the operation of the first type host and the second type host, and to display the operating status of the first type host and the second type host of the power generation system. The first power supply voltage 220V+ output by the control mode selection circuit 202 is transmitted to the first pressure detection switch 2012 and / or the second pressure detection switch 2013.

[0052] It is understandable that the first power supply voltage 220V+ output by the control mode selection circuit 202 through its first output terminal or its second output terminal is determined according to the working conditions of the first type host and the second type host. For example, when the first type host is working and the second type host is not working, the first power supply voltage 220V+ can be output to the first pressure detection switch 2012 through the first output terminal of the working condition display circuit 2010. When the first type host is not working and the second type host is working, the first power supply voltage 220V+ can be output to the second pressure detection switch 2013 through the second output terminal of the working condition display circuit 2010.

[0053] The first pressure detection switch 2012 can be used to close when it receives a first power supply voltage 220V+ and the first pressure of the first type of host lubricating oil header is abnormal, so as to transmit the first power supply voltage 220V+ to the start coil branch 203 to start the DC oil pump.

[0054] The second pressure detection switch 2013 can be used to close when receiving the first power supply voltage 220V+ and the second pressure of the second type of host lubricating oil header is abnormal, so as to transmit the first power supply voltage 220V+ to the start coil branch 203 to start the DC oil pump.

[0055] In this embodiment of the disclosure, the operation status display circuit receives and responds to the operations of the first type host and the second type host, and is used to display the operating status of the first type host and the second type host of the power generation system. The first power supply voltage output by the control mode selection circuit is transmitted to the first pressure detection switch or the second pressure detection switch. When the first pressure detection switch 2012 receives the first power supply voltage and the first pressure of the lubricating oil header of the first type host is abnormal, it closes and transmits the first power supply voltage to the starting coil branch to start the DC oil pump. When the second pressure detection switch 2013 receives the first power supply voltage and the second pressure of the lubricating oil header of the second type host is abnormal, it closes and transmits the first power supply voltage to the starting coil branch to start the DC oil pump. Thus, when the first type of main unit (compressor) is operating, the operating condition display circuit shows that the first type of main unit of the power generation system is in energy storage mode, and the first power supply voltage is output to the first pressure detection switch 2012. If the first pressure of the lubricating oil header of the first type of main unit is abnormal, the first pressure detection switch 2012 can be closed, thereby starting the DC oil pump. When the second type of main unit (turbine) is operating, the operating condition display circuit shows that the second type of main unit of the power generation system is in energy release mode, and the first power supply voltage is output to the second pressure detection switch 2013. If the second pressure of the lubricating oil header of the second type of main unit is abnormal, the second pressure detection switch 2013 can be closed, thereby starting the DC oil pump, reducing the failure of the AC oil pump. The risk of failure to start the DC oil pump in conjunction with the AC oil pump is reduced. When both the first type of main unit (compressor) and the second type of main unit (turbine) are operating, the operating condition display circuit shows that the first type of main unit of the power generation system is in energy storage mode and the second type of main unit is in energy release mode. The first power supply voltage is output to the first pressure detection switch 2012 and the second pressure detection switch 2013. If the first pressure of the lubricating oil header of the first type of main unit is abnormal, the first pressure detection switch 2012 can be closed, thereby starting the DC oil pump in conjunction with the AC oil pump. If the second pressure of the lubricating oil header of the second type of main unit is abnormal, the second pressure detection switch 2013 can be closed, thereby starting the DC oil pump in conjunction with the AC oil pump. This greatly reduces the risk of failure to start the DC oil pump in conjunction with the AC oil pump when the AC oil pump loses power.

[0056] In exemplary embodiments of this disclosure, reference continues to be made to... Figure 3The operating condition display circuit 2010 may include an operating condition switching knob 2011. The first connection point 301 of the operating condition switching knob 2011 may be connected to the first output terminal of the control mode selection circuit 202. The second connection point 302 and the third connection point 303 of the operating condition switching knob 2011 may be connected to the first terminal of the first pressure detection switch 2012 and the first terminal of the second pressure detection switch 2013, respectively.

[0057] When the first connection point 301 of the operating condition switching knob 2011 is connected to its second connection point 302, the first type of generator in the power generation system is engaged, and the DC oil pump pipeline interlock of the first type of generator is engaged; the second type of generator is disengaged, and the DC oil pump pipeline interlock of the second type of generator is disengaged; the first power supply voltage 220V+ is transmitted to the first terminal of the first pressure detection switch 2012 through the second connection point 302 of the operating condition switching knob 2011. When the first connection point 301 of the operating condition switching knob 2011 is connected to its third connection point 303, the second type of generator in the power generation system is engaged, and the DC oil pump pipeline interlock of the second type of generator is engaged; the first type of generator is disengaged, and the DC oil pump pipeline interlock of the first type of generator is disengaged; the first power supply voltage 220V+ is transmitted to the first terminal of the second pressure detection switch 2013 through the third connection point 303 of the operating condition switching knob 2011.

[0058] Here, the target operating condition for putting the first type of host into operation and cutting off the second type of host can be an energy storage operating condition, and the target operating condition for putting the second type of host into operation and cutting off the first type of host can be an energy release operating condition.

[0059] It is understandable that the second terminal of the first pressure detection switch 2012 and the second terminal of the second pressure detection switch 2013 can both be connected to one end (common connection terminal) of the normally closed contact 2032 of the stop contactor KC2 in the start coil branch 203.

[0060] In the embodiments of this disclosure, the first output terminal of the control mode selection circuit is connected to the first connection point of the operating condition switching knob, and the first terminals of the first and second pressure detection switches are respectively connected to the second and third connection points of the operating condition switching knob. When the first connection point of the operating condition switching knob is connected to its second connection point, the first type of generator in the power generation system is engaged, and the DC oil pump pipeline interlock of the first type of generator is engaged; the second type of generator is disengaged, and the DC oil pump pipeline interlock of the second type of generator is disengaged; the first power supply voltage is transmitted to the first terminal of the first pressure detection switch through the second connection point of the operating condition switching knob. When the first connection point of the operating condition switching knob is connected to its third connection point, the second type of generator in the power generation system is engaged, and the DC oil pump pipeline interlock of the second type of generator is engaged; the first type of generator is disengaged, and the DC oil pump pipeline interlock of the first type of generator is disengaged; the first power supply voltage is transmitted to the first terminal of the second pressure detection switch through the third connection point of the operating condition switching knob. In this way, the corresponding first pressure detection switch and / or second pressure detection switch can be connected under different target operating conditions, so that the DC oil pump can be started by closing the first pressure detection switch and the second pressure detection switch.

[0061] In some embodiments of this disclosure, reference continues to be made to Figure 3 The DC oil pump auxiliary start circuit 201 may also include a first diode 2014 (referred to as D1 in this disclosure) and a second diode 2015 (referred to as D2 in this disclosure).

[0062] The anode of the first diode 2014 can be connected to the first pressure detection switch 2012, and the cathode of the first diode 2014 can be connected to the start coil branch 203 (common connection terminal).

[0063] The anode of the second diode 2015 can be connected to the second pressure detection switch 2013, and the cathode of the second diode 2015 can be connected to the cathode of the first diode 2014 and the start coil branch 203.

[0064] In this embodiment, by connecting the anode of the first diode to the first pressure detection switch and the cathode to the start-up coil branch, the first power supply voltage DC220+ can be prevented from being transmitted to the second connection point of the operating condition switching knob when the first pressure detection switch is closed, even when the first power supply voltage DC220+ is being transmitted to the start-up coil branch. Similarly, by connecting the anode of the second diode to the second pressure detection switch and the cathode to the start-up coil branch, the first power supply voltage DC220+ can be prevented from being transmitted to the third connection point of the operating condition switching knob when the second pressure detection switch is closed, even when the first power supply voltage DC220+ is being transmitted to the start-up coil branch.

[0065] In some embodiments of this disclosure, reference continues to be made to... Figure 3The control circuit for the DC oil pump in the power generation system also includes a status display circuit 2016.

[0066] The status display circuit 2016 can be connected between the operating status display circuit 2010 and the second power supply voltage DC220-, and is used to issue a first status display signal when the first type of host is put into operation, and to issue a second status display signal when the second type of host is put into operation.

[0067] It is understandable that the first status display signal and the second status display signal can be signals from different indicator lights indicating whether the light is on or off.

[0068] In this embodiment of the present disclosure, a first status display signal is issued when the first type of host is put into operation, and a second status display signal is issued when the second type of host is put into operation. In this way, the operating condition of the power generation system can be identified by the status display circuit, and faults in different operating conditions of the power generation system can be detected in a timely manner.

[0069] In one embodiment of this disclosure, reference continues to be made to... Figure 3 The status display circuit 2016 may include a first status indicator 304 (referred to as L2 in this disclosure) and a second status indicator 305 (referred to as L3 in this disclosure).

[0070] The first status indicator 304 can be connected between the first output terminal of the operating condition display circuit 2010 and the second power supply voltage DC220.

[0071] The second status indicator 305 can be connected between the second output terminal of the operating condition display circuit 2010 and the second power supply voltage DC220.

[0072] In this embodiment of the present disclosure, a first status indicator light is connected between the first output terminal of the operating condition display circuit and the second power supply voltage DC220-, so that a first status display signal can be emitted when the first type of host is put into operation, in order to identify the operating condition of the power generation system. A second status indicator light is connected between the second output terminal of the operating condition display circuit and the second power supply voltage DC220-, so that a second status display signal can be emitted when the energy release host is put into operation, in order to identify the operating condition of the power generation system.

[0073] In some embodiments of this disclosure, the operating condition display circuit 2010, the first status indicator 304, and the second status indicator 305 can all be located in the control room of the power generation system, and the control mode selection circuit 202 can be located at the gas station of the power generation system.

[0074] In this embodiment of the disclosure, by setting the operating condition display circuit, the first status indicator light, and the second status indicator light in the control room of the power generation system, the switching and selection of the operating conditions of the power generation system can be realized in the control room, which greatly reduces the workload of the operators. At the same time, the status of the first status indicator light and the second status indicator light can be observed in the control room to determine whether the DC oil pump control circuit of the power generation system is working properly, which is conducive to timely identification of faults in the DC oil pump control circuit of the power generation system.

[0075] In some embodiments of this disclosure, the control circuit of the DC oil pump in the power generation system may include a distributed control circuit 204 (distributed DC oil pump control circuit) parallel to the DC oil pump auxiliary start circuit 201. The distributed control circuit includes a normally open contact 2041 of a distributed start contactor (referred to as DCS start in this disclosure) and a normally open contact 2042 of a distributed stop contactor (referred to as DCS stop in this disclosure), which can be used to start or stop the DC oil pump of the power generation system, respectively.

[0076] Among them, the normally open contact 2041 of the distributed start contactor can be used for the DC oil pump of the tandem start-up system, and the normally open contact 2042 of the distributed stop contactor can be used to disable the DC oil pump of the tandem start-up system.

[0077] It is understood that the distributed control circuit 204 may also include a distributed control system (DCS) controller, a coil of a distributed start contactor, a coil of a distributed stop contactor, and other circuits, which will not be specifically described in this disclosure. Specifically, the DCS controller can detect abnormal oil pressure in the lubricating oil header of the generator system at the oil station side and issue a DCS start command when the DC oil pump needs to be activated. This command energizes the coil of the distributed start contactor DCS start, causing the normally open contact 2041 of the distributed start contactor DCS start to close, thereby starting the DC oil pump. The DCS controller can also issue a DCS stop command when the DC oil pump needs to be deactivated, energizing the coil of the distributed stop contactor DCS stop, causing the normally open contact 2042 of the distributed stop contactor DCS stop to close, thereby stopping the DC oil pump.

[0078] In this embodiment of the present disclosure, a distributed control circuit parallel to the auxiliary start circuit of the DC oil pump is set in the control circuit of the DC oil pump in the power generation system. The normally open contacts of the distributed start contactor and the normally open contacts of the distributed stop contactor are controlled by the software program to realize the control of the joint start or prohibition of the joint start of the DC oil pump in the power generation system, thereby improving the reliability of the joint start or prohibition of the joint start of the DC oil pump in the power generation system.

[0079] It is understood that the DC oil pump auxiliary start circuit 201 disclosed herein can start or stop the DC oil pump when the distributed control circuit 204 experiences software delay or failure, thereby improving the reliability of starting or stopping the DC oil pump in the power generation system.

[0080] Figure 4 This is a schematic diagram of the composition of a DC oil pump control circuit in a power generation system according to another exemplary embodiment of this disclosure.

[0081] like Figure 4 As shown, the local DC oil pump start circuit 206, which is set between the control mode selection circuit 202 and the start coil branch 203, may include a local start DC oil pump button 2061 (referred to as SP1 in this disclosure) and a local DC oil pump stop button 2062 (referred to as SP2 in this disclosure).

[0082] The control mode selection circuit 202 may include a main switch 2021 and a control mode switching knob 2022.

[0083] The first terminal of the main switch 2021 (referred to as QF1 in this disclosure) can be connected to a first power supply voltage DC220+.

[0084] It is understandable that since the first terminal of the main switch 2021 is connected to the first power supply voltage DC220+, the condition of the main switch 2021 being off can be identified as the maintenance control mode of the host.

[0085] The common terminal 306 of the control mode switching knob 2022 can be connected to the second terminal of the main switch 2021, and the first terminal 307 of the control mode switching knob 2022 can be connected to the starter coil branch 203 via the local start DC oil pump button 2061. Figure 4 The local start button 2061 for the DC oil pump is connected to one end of the normally closed contact 2032 of the stop contactor KC2. The second terminal 308 of the control mode switching knob 2022 can be connected to the first connection point 301 of the operating condition switching knob 2011.

[0086] Understandably, when the control mode switching knob 2022 is manually turned to the left, it corresponds to the local control mode, and the common terminal 306 of the control mode switching knob 2022 is connected to its first terminal 307. When the control mode switching knob 2022 is manually turned to the right, it corresponds to the remote control mode, and the common terminal 306 of the control mode switching knob 2022 is connected to its second terminal 308.

[0087] In this embodiment, the positive terminal of the DC oil pump's operating power supply voltage is connected to the first terminal of the main switch, and the second terminal of the main switch is connected to the common terminal of the control mode switching knob. When the control mode switching knob is turned to the corresponding local control mode (the common terminal of the control mode switching knob is connected to the first terminal), the voltage signal on the positive terminal of the DC oil pump's operating power supply voltage can be connected to the start coil branch through the first button, so as to realize the joint start of the local DC oil pump through the first button.

[0088] In some embodiments of this disclosure, reference continues to be made to Figure 4 As shown, the normally open contact 200 of the start contactor KM1 can be connected across the second terminal (common terminal 306 of the control mode switching knob 2022) of the main switch 2021 and the first common connection point.

[0089] It is understandable that, since the normally open contact 200 of the starting contactor can be connected across the second terminal of the main switch 2021 and the first common connection point, when the coil 2031 of the starting contactor KM1 is energized, the normally open contact 200 of the starting contactor can close, so that the operating circuit can maintain its operation. At the same time, due to the presence of the first diode 2014 and the second diode 2015, the voltage of the positive terminal DC220+ of the DC oil pump's operating power supply voltage transmitted to the normally open contact 200 of the starting contactor cannot activate the first status indicator 304 or the second status indicator 305 when the first pressure detection switch 2012 or the second pressure detection switch 2013 is closed, thus avoiding false indications by the first status indicator 304 and the second status indicator 305.

[0090] In this embodiment of the present disclosure, by bridging the normally open contact of the starting contactor between the second terminal of the main switch and the first common connection point, the normally open contact of the starting contactor can be connected in series with the starting coil branch, so that when the coil of the starting contactor is energized, the operating circuit of the DC oil pump can achieve self-holding operation.

[0091] In some embodiments of this disclosure, reference continues to be made. Figure 4As shown, the control circuit 20 of the DC oil pump in the power generation system may further include a stop coil branch 205, which can be connected in parallel with the start coil branch 203. The stop coil branch 205 may include a normally open contact 2051 of the stop contactor KC2 and a coil 2052 of the stop contactor KC2 connected in series. The first terminal of the normally open contact 2051 of the stop contactor KC2 is connected to a first common connection point, and the second terminal of the normally open contact 2051 of the stop contactor KC2 is connected to the first terminal of the coil 2052 of the stop contactor KC2 (the connection point between the second terminal of the normally open contact 2051 of the stop contactor KC2 and the first terminal of the coil 2052 of the stop contactor KC2 can be used as a second common connection point). The second terminal of the coil 2052 of the stop contactor KC2 is connected to a second power supply voltage DC220-.

[0092] Continue to refer to Figure 4 The normally open contact 2042 of the distributed stop contactor DCS can be connected across the first connection point 301 (the second terminal 308 of the control mode switching knob 2022) of the operating condition rotary knob 2011 and the second common connection point. When the normally open contact 2041 of the distributed start contactor DCS closes, power is supplied to the coil 2031 of the start contactor KM1 through the normally closed contact 2032 of the stop contactor KC2, thereby causing the normally open contact 200 of the start contactor KM1 to close, thus starting the DC oil pump. When the normally open contact 2042 of the distributed stop contactor DCS is closed, power is supplied to the coil 2052 of the stop contactor KC2, causing the normally open contact 2051 of the stop contactor KC2 to close and the normally closed contact 2032 of the stop contactor KC2 to open. This de-energizes the coil 2031 of the start contactor KM1, opens the normally open contact 200 of the start contactor KM1, and stops the operation of the DC oil pump.

[0093] Continue to refer to Figure 4When the common terminal 306 of the control mode switching knob 2022 is connected to its first terminal 307 (the control mode switching knob 2022 is turned to the left), the second terminal of the main switch 2021 is connected to the first terminal 307 of the control mode switching knob 2022, the first terminal of the local DC oil pump start button 2061 is connected to the first terminal 307 of the control mode switching knob 2022, and the second terminal of the local DC oil pump start button 2061 is connected to the first common connection point. The first terminal of the local DC oil pump stop button 2062 is connected to the first terminal 307 of the control mode switching knob 2022, and the second terminal of the local DC oil pump stop button 2062 is connected to the second common connection point. Thus, when the local DC oil pump start button 2061 is closed, power is supplied to the coil 2031 of the start contactor KM1 through the normally closed contact 2032 of the stop contactor KC2, thereby causing the normally open contact 200 of the start contactor KM1 to close, and the DC oil pump is started. When the local DC oil pump stop button 2062 is closed, power is supplied to the coil 2052 of the stop contactor KC2, causing the normally open contact 2051 of the stop contactor KC2 to close and the normally closed contact 2032 of the stop contactor KC2 to open. This causes the coil 2031 of the start contactor KM1 to be de-energized, and the normally open contact 200 of the start contactor KM1 to open, thus stopping the operation of the DC oil pump.

[0094] As can be seen, on the local side of the gas station, the DC oil pump can be started or stopped by the local DC oil pump start button 2061 and the local DC oil pump stop button 2062. Alternatively, the DC oil pump can be started or stopped by controlling the normally open contact 2041 of the distributed start contactor DCS start and the normally open contact 2042 of the distributed stop contactor DCS stop. Because the software logic judgment of the DCS controller has lag and uncertainty, this disclosure uses a DC oil pump auxiliary start circuit 201 to start the DC oil pump when the pressure of the generator main unit is abnormal.

[0095] The following will continue to combine Figure 4 The principle of the DC oil pump control circuit in a carbon dioxide energy storage power generation system is described.

[0096] When the main switch 2021 (in this disclosure, QF1 can be a circuit breaker or push button located on the oil pump side) is open (corresponding to the main unit's control mode being maintenance control mode), the DC oil pump control circuit in the carbon dioxide energy storage power generation system can be maintained. When the main switch 2021 is closed, either remote control mode or local control mode can be selected as the control mode for the DC oil pump control circuit. Generally, to avoid manually starting and stopping the DC oil pump at the gas station, the remote control mode can be selected as the main unit's control mode.

[0097] For the local control mode, the common terminal 306 of the control mode switching knob 2022 is connected to the first terminal 307 (rotated to the left). Therefore, when the local start DC oil pump button 2061 is closed, the first power supply voltage (the 220V DC voltage output from the positive terminal of the DC oil pump's operating power supply voltage) DC220+ passes sequentially through the main switch 2021, the common terminal 306 and the first terminal 307 of the control mode switching knob 2022, the local start DC oil pump button 2061, the normally closed contact 2032 of the stop contactor KC2, and the start contactor KM1. The coil 2031 is returned to the second power supply voltage (the negative terminal of the DC oil pump's operating power supply voltage) DC220- (forming a circuit) to provide 220V DC power to the coil 2031 of the starting contactor KM1 and the indicator light 2033 of the working status, so that the current on the coil 2031 of the starting contactor KM1 is greater than the first preset current threshold (determined according to the electrical performance parameters of the selected starting contactor KM1), the normally open contact 200 of the starting contactor KM1 closes, and the indicator light 2033 (L1) of the working status lights up to indicate that the DC oil pump is in operation. Simultaneously, when the local DC oil pump stop button 2062 is closed, the first power supply voltage (220V DC voltage output from the positive terminal of the DC oil pump's operating power supply voltage) DC220+ passes sequentially through the common terminal 306 and the first terminal 307 of the main switch 2021, the local DC oil pump stop button 2062, and the coil 2052 of the stop contactor KC2 back to the second power supply voltage (the negative terminal of the DC oil pump's operating power supply voltage DC220-), so as to supply power to the stop contactor KC2. The coil 2052 of the stop contactor KC2 is supplied with 220V DC power, which makes the current on the coil 2052 of the stop contactor KC2 greater than the second preset current threshold (determined according to the electrical performance parameters of the selected stop contactor KC2), causing the normally closed contact 2032 of the stop contactor KC2 to open, the coil 2031 of the start contactor KM1 to be de-energized, the working status indicator light 2033 to go out, indicating that the DC oil pump is in the off state, the normally open contact 200 of the start contactor KM1 to open, and the DC oil pump to stop working.

[0098] For remote control, the common terminal 306 of the control mode switching knob 2022 is connected to the second terminal 308 (rotated to the right), which can include two implementation methods. One implementation method is that the DCS controller controls the opening and closing of the normally open contact 200 of the start contactor KM1 by controlling the opening and closing of the normally open contact 2041 of the distributed start contactor DCS start and the normally open contact 2042 of the distributed stop contactor DCS stop, thereby controlling the joint start and stop of the joint start DC oil pump. The other implementation method is to use the opening and closing of the first pressure detection switch 2012 and / or the second pressure detection switch 2013 in the DC oil pump auxiliary start circuit 201 to jointly start and stop the joint start DC oil pump.

[0099] Since the first implementation method in the remote control approach is quite similar to the local control approach, the only difference being that the local control approach starts the DC oil pump by manually pressing the local start button 2061 and stops it by manually pressing the local stop button 2062, while the first implementation method in the remote control approach starts the DC oil pump by sending a start command from the DCS controller to control the closing and opening of the normally open contact 2041 of the distributed start contactor DCS start, and stops it by sending a stop command from the DCS controller to control the closing and opening of the normally open contact 2042 of the distributed stop contactor DCS stop. Therefore, a detailed description is not provided here.

[0100] For the second implementation method in the remote control mode, when the first connection point 301 and the second connection point 302 of the operating condition switching knob 2011 are connected (rotated to the left), and the double-throw switch S1 is open, the power generation system operates in the energy storage mode. The first power supply voltage (220V DC voltage output from the positive terminal of the DC oil pump's operating power supply voltage) DC220+ passes through the main switch 2021, the common terminal 306 and the second terminal 308 of the control mode switching knob 2022, the first connection point 301 and the second connection point 302 of the operating condition switching knob 2011, and the first status indicator 304 to return to the second power supply voltage (the negative terminal of the DC oil pump's operating power supply voltage) DC220-. The first status indicator 304 lights up (issuing a first status display signal, indicating that it is operating in the energy storage mode, and the first type of host DC oil pump pipeline is in the interlock engaged state, and the second type of host DC oil pump pipeline is in the interlock disconnected state).

[0101] If, under energy storage conditions, the first pressure detection switch 2012 is closed (due to the pressure decreasing to less than or equal to the first preset pressure threshold), the first power supply voltage sequentially passes through the main switch 2021, the common terminal 306 of the control mode switching knob 2022, the second terminal 308, the first connection point 301 and the second connection point 302 of the operating condition switching knob 2011, the first pressure detection switch 2012, the first diode 2014, the normally closed contact 2032 of the stop contactor KC2, and the coil 2031 of the start contactor KM1 back to the second power supply voltage DC220-, so as to provide 220V DC power to the coil 2031 of the start contactor KM1 and the status indicator L1, so that the current on the coil 2031 of the start contactor KM1 is greater than the first preset current threshold (determined according to the electrical performance parameters of the selected start contactor), the normally open contact 200 of the start contactor KM1 closes, so that the working status indicator 2033 lights up to indicate that the DC oil pump is in operation.

[0102] For the second implementation method in the remote control mode, when the first connection point 301 and the third connection point 303 of the operating condition switching knob 2011 are connected (rotated to the right), and the double-throw switch S1 is open, the power generation system operates in the energy release condition. The first power supply voltage DC220+ passes through the main switch 2021, the common terminal 306 and the second terminal 308 of the control mode switching knob 2022, the first connection point 301 and the third connection point 303 of the operating condition switching knob 2011, and the second status indicator 305 to return to the second power supply voltage DC220-. The second status indicator 305 lights up (issuing a second status display signal, indicating that it is operating in the energy release condition, and the second type of host DC oil pump pipeline is in the interlock engaged state, while the first type of host DC oil pump pipeline is in the interlock disconnected state).

[0103] If, under the energy release condition, the second pressure detection switch 2013 closes (because the pressure decreases to less than or equal to the second preset pressure threshold), then the first power supply voltage DC220+ passes sequentially through the main switch 2021, the common terminal 306 and the second terminal 308 of the control mode switching knob 2022, the first connection point 301 and the third connection point 303 of the operating condition switching knob 2011, the second pressure detection switch 2013, the second diode 2015, the normally closed contact 2032 of the stop contactor KC2, and the start... The coil 2031 of the starting contactor KM1 returns to the second power supply voltage DC220- to provide 220V DC power to the coil 2031 of the starting contactor KM1 and the status indicator L1, so that the current on the coil 2031 of the starting contactor KM1 is greater than the first preset current threshold (determined according to the electrical performance parameters of the selected starting contactor KM1), the normally open contact 200 of the starting contactor KM1 closes, and the working status indicator 2033 lights up to indicate that the DC oil pump is in operation.

[0104] For the second implementation method in the remote control mode, regardless of whether the operating condition switching knob 2011 is turned to the right or left, as long as the double-throw switch S1 is closed, the power generation system operates in the double-throw mode, that is, the energy storage host and the energy release host are both working, and the DC oil pump pipeline of the first type host and the DC oil pump pipeline of the second type host are both in the interlocked state. As with the above analysis, the first status indicator 304 and the second status indicator 305 are both lit, and when either the first pressure detection switch 2012 or the second pressure detection switch 2013 is closed, the DC oil pump is started.

[0105] Based on the above embodiments, this disclosure also provides a control method for a DC oil pump in a power generation system.

[0106] Figure 5 This is a schematic diagram illustrating the implementation process of a control method for a DC oil pump in a power generation system according to an exemplary embodiment of this disclosure.

[0107] like Figure 5 As shown, a control method for a DC oil pump in a power generation system disclosed herein may include:

[0108] Step S501: Receive and respond to the demand command of the power generation system through the DC oil pump auxiliary start circuit, connect the control mode selection circuit of the DC oil pump control circuit to the start coil branch, control the DC oil pump control circuit of the power generation system to work under the corresponding demand command, and when the lubricating oil main pipe pressure of the power generation system is abnormal, connect the control mode selection circuit and the start coil branch to start the DC oil pump.

[0109] In this embodiment of the disclosure, the control mode selection circuit can be used to select the control mode of the DC oil pump of the power generation system as maintenance, remote or local control mode; the starting coil branch can include a starting contactor coil, which is used to close the normally open contact of the starting contactor when the starting contactor coil is energized, so as to start the DC oil pump.

[0110] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and concept of this disclosure are indicated by the claims.

Claims

1. A DC oil pump control circuit for a power generation system, characterized in that, include: A DC oil pump auxiliary starting circuit is set between the control mode selection circuit and the starting coil branch. It is used to receive and respond to the demand command of the power generation system, control the DC oil pump control circuit of the power generation system to work under the corresponding demand command, and when the pressure of the lubricating oil main pipe of the power generation system is abnormal, connect the control mode selection circuit and the starting coil branch to start the DC oil pump. The control mode selection circuit is used to select the control mode of the DC oil pump of the power generation system as maintenance, remote or local control mode; the starting coil branch includes a starting contactor coil, which is used to close the normally open contact of the starting contactor when the starting contactor coil is energized, so as to start the DC oil pump. The DC oil pump auxiliary start circuit includes: The operating condition display circuit has its first input terminal connected to the first output terminal of the control mode selection circuit. The first pressure detection switch has its first end connected to the first output terminal of the working condition display circuit, and its second end connected to the start coil branch. The second pressure detection switch has its first end connected to the second output end of the operating condition display circuit, and its second end connected to the start coil branch. The lubricating oil header of the power generation system includes a first type of main engine lubricating oil header and a second type of main engine lubricating oil header. The pressure abnormality of the lubricating oil header of the power generation system includes a first pressure abnormality of the first type of main engine lubricating oil header and a second pressure abnormality of the second type of main engine lubricating oil header. The operating status display circuit is used to receive and respond to the operations of the first type of host and the second type of host, and to display the operating status of the first type of host and the second type of host of the power generation system. The first power supply voltage output by the control mode selection circuit is transmitted to the first pressure detection switch and / or the second pressure detection switch. The first pressure detection switch is used to close when the first power supply voltage is received and the first pressure of the first type of host lubricating oil header is abnormal, so as to transmit the first power supply voltage to the start coil branch to start the DC oil pump. The second pressure detection switch is used to close when the first power supply voltage is received and the second pressure of the second type of host lubricating oil header is abnormal, so as to transmit the first power supply voltage to the start coil branch to start the DC oil pump. The operating condition display circuit includes an operating condition switching knob, whose first connection point is connected to the first output terminal of the control mode selection circuit, and whose second and third connection points are respectively connected to the first terminal of the first pressure detection switch and the first terminal of the second pressure detection switch. When the first connection point of the operating condition switching knob is connected to its second connection point, the DC oil pump pipeline interlock of the first type of host is engaged, and the DC oil pump pipeline interlock of the second type of host is disengaged. The first power supply voltage is transmitted to the first terminal of the first pressure detection switch through the second connection point of the operating condition switching knob. When the first connection point of the operating condition switching knob is connected to its third connection point, the DC oil pump pipeline interlock of the second type of host in the power generation system is engaged, and the DC oil pump pipeline interlock of the first type of host is disengaged. The first power supply voltage is transmitted to the first terminal of the second pressure detection switch through the third connection point of the operating condition switching knob.

2. The control circuit according to claim 1, characterized in that, The DC oil pump auxiliary start circuit also includes: The first diode has its anode connected to the first pressure detection switch and its cathode connected to the start-up coil branch; The second diode has its anode connected to the second pressure detection switch and its cathode connected to the cathode of the first diode and the start-up coil branch.

3. The control circuit according to claim 1, characterized in that, The control circuit also includes: A status display circuit is connected between the operating condition display circuit and the second power supply voltage. It is used to display the interlocking status of the DC oil pump pipeline of the first type of host when the first type of host is working, and to display the interlocking status of the DC oil pump pipeline of the second type of host when the second type of host is working.

4. The control circuit according to claim 3, characterized in that, The status display circuit includes a first status indicator and a second status indicator; The first status indicator light is connected between the first output terminal of the operating condition display circuit and the second power supply voltage; The second status indicator light is connected between the second output terminal of the operating condition display circuit and the second power supply voltage, which represents the negative terminal voltage of the DC oil pump's operating power supply.

5. The control circuit according to claim 4, characterized in that, The operating condition display circuit, the first status indicator light, and the second status indicator light are all located in the control room of the power generation system.

6. The control circuit according to any one of claims 1 to 5, characterized in that, Also includes: The distributed control circuit connected in parallel with the DC oil pump auxiliary starting circuit includes normally open contacts of a distributed starting contactor and normally open contacts of a distributed inhibiting contactor, which are used to start or inhibit the start of the DC oil pump of the power generation system, respectively.

7. A method for controlling a DC oil pump in a power generation system, characterized in that, include: The DC oil pump auxiliary start circuit receives and responds to the demand command of the power generation system, connects the control mode selection circuit of the DC oil pump control circuit to the start coil branch, controls the DC oil pump control circuit of the power generation system to work under the corresponding demand command, and when the pressure of the lubricating oil main pipe of the power generation system is abnormal, connects the control mode selection circuit to the start coil branch to start the DC oil pump. The control mode selection circuit is used to select the control mode of the DC oil pump of the power generation system as maintenance, remote or local control mode; the starting coil branch includes a starting contactor coil, which is used to close the normally open contact of the starting contactor when the starting contactor coil is energized, so as to start the DC oil pump. The DC oil pump auxiliary start circuit includes: The operating condition display circuit has its first input terminal connected to the first output terminal of the control mode selection circuit. The first pressure detection switch has its first end connected to the first output terminal of the working condition display circuit, and its second end connected to the start coil branch. The second pressure detection switch has its first end connected to the second output end of the operating condition display circuit, and its second end connected to the start coil branch. The lubricating oil header of the power generation system includes a first type of main engine lubricating oil header and a second type of main engine lubricating oil header. The pressure abnormality of the lubricating oil header of the power generation system includes a first pressure abnormality of the first type of main engine lubricating oil header and a second pressure abnormality of the second type of main engine lubricating oil header. The operating status display circuit is used to receive and respond to the operations of the first type of host and the second type of host, and to display the operating status of the first type of host and the second type of host of the power generation system. The first power supply voltage output by the control mode selection circuit is transmitted to the first pressure detection switch and / or the second pressure detection switch. The first pressure detection switch is used to close when the first power supply voltage is received and the first pressure of the first type of host lubricating oil header is abnormal, so as to transmit the first power supply voltage to the start coil branch to start the DC oil pump. The second pressure detection switch is used to close when the first power supply voltage is received and the second pressure of the second type of host lubricating oil header is abnormal, so as to transmit the first power supply voltage to the start coil branch to start the DC oil pump. The operating condition display circuit includes an operating condition switching knob, whose first connection point is connected to the first output terminal of the control mode selection circuit, and whose second and third connection points are respectively connected to the first terminal of the first pressure detection switch and the first terminal of the second pressure detection switch. When the first connection point of the operating condition switching knob is connected to its second connection point, the DC oil pump pipeline interlock of the first type of host is engaged, and the DC oil pump pipeline interlock of the second type of host is disengaged. The first power supply voltage is transmitted to the first terminal of the first pressure detection switch through the second connection point of the operating condition switching knob. When the first connection point of the operating condition switching knob is connected to its third connection point, the DC oil pump pipeline interlock of the second type of host in the power generation system is engaged, and the DC oil pump pipeline interlock of the first type of host is disengaged. The first power supply voltage is transmitted to the first terminal of the second pressure detection switch through the third connection point of the operating condition switching knob.

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