A waste heat utilization generator set and its runaway prevention device and method

Abstract

The embodiment of the present invention discloses a waste heat utilization generator set and its runaway prevention device and method. The runaway prevention device of the generator set includes a converter, the converter includes an alarm branch; the generator set is electrically connected to an energy-consuming resistor through the converter; the converter controls the generator set to be disconnected from the energy-consuming resistor when the output voltage of the generator set exceeds a threshold voltage, and controls the alarm branch to be powered on at the same time; a braking circuit, the generator set is electrically connected to the energy-consuming resistor through the braking circuit; the braking circuit is connected in parallel with the alarm branch, and the braking circuit controls the connection between the generator set and the energy-consuming resistor according to the power-on of the alarm branch; so that in the process of closing the expander intake valve and opening the expander exhaust valve, the generator set is connected to the energy-consuming resistor, and the energy-consuming resistor acts as a braking resistor to release the rotation speed of the generator set, effectively preventing the generator set from running away in the process of closing the expander intake valve and opening the exhaust valve.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power generation sets, and in particular to a waste heat utilization power generation set and a device and method for preventing runaway. Background Art

[0002] Waste heat power generation refers to the technology of converting excess heat energy in the production process into electrical energy.

[0003] In the waste heat utilization generator set, the higher the speed of the generator set, the higher the output voltage of the generator set. The output voltage of the generator set is monitored by the converter. When the output voltage of the generator set exceeds the rated voltage or the protection threshold, the converter will disconnect the connection between the generator set and the load, and the waste heat utilization generator set controls the intake valve of the expander to close and the exhaust valve to open to reduce the speed of the generator set to prevent the generator set from running away.

[0004] However, at the moment when the inverter disconnects the generator set from the load, the time required to close the expander intake valve and open the expander exhaust valve is often longer than the time it takes for the generator set to go from rated speed to overspeed. Typically, the time required to close the expander intake valve and open the expander exhaust valve is 4 seconds, while the time it takes for the generator set to go from rated speed to overspeed is 1-2 seconds. Therefore, when the output voltage of the generator set exceeds the rated voltage or the protection threshold, simply closing the expander intake valve and opening the exhaust valve to reduce the speed of the generator set is still unable to prevent the generator set from running away. Summary of the invention

[0005] The embodiment of the present invention provides a waste heat utilization generator set and a device and method for preventing runaway of the generator set, so as to effectively prevent the generator set from running away when the output voltage of the generator set exceeds the rated voltage or the protection threshold, thereby protecting the generator set.

[0006] In a first aspect, an embodiment of the present invention provides a device for preventing a running-away of a waste heat utilization generator set, the device for preventing a running-away of a waste heat utilization generator set comprising:

[0007] A converter, wherein the converter comprises an alarm branch; the generator set is electrically connected to an energy-consuming resistor through the converter; when the output voltage of the generator set exceeds a threshold voltage, the converter controls the generator set to be disconnected from the energy-consuming resistor and controls the alarm branch to be powered on;

[0008] A braking circuit, wherein the generator set is electrically connected to the energy-consuming resistor through the braking circuit; the braking circuit is connected in parallel with the alarm branch, and the braking circuit controls the connection between the generator set and the energy-consuming resistor according to the power-on of the alarm branch.

[0009] Optionally, the brake circuit includes a relay and a first circuit breaker;

[0010] One end of the coil of the relay is electrically connected to the first end of the alarm branch, and the other end of the coil of the relay is electrically connected to the second end of the alarm branch;

[0011] One end of the normally open contact of the relay is electrically connected to the first end of the alarm branch, and the other end of the normally open contact of the relay is electrically connected to the second end of the alarm branch through the coil of the first circuit breaker;

[0012] One end of the contact of the first circuit breaker is electrically connected to the generator set, and the other end of the contact of the first circuit breaker is electrically connected to the energy dissipation resistor.

[0013] Optionally, the alarm branch includes a fault indicator light, a first end of the fault indicator light serves as the first end of the alarm branch, and a second end of the fault indicator light serves as the second end of the alarm branch.

[0014] Optionally, the converter further includes a grid-side circuit breaker, a machine-side circuit breaker and a rectifier-inverter module;

[0015] The generator set is connected to the energy-consuming resistor in sequence through the generator-side circuit breaker, the rectifier-inverter module and the grid-side circuit breaker;

[0016] When the output voltage of the generator set exceeds a threshold voltage, the converter controls the grid-side circuit breaker and the machine-side circuit breaker to be disconnected, so as to control the disconnection between the generator set and the energy-consuming resistor.

[0017] Optionally, the generator set includes a programmable logic controller and an expander;

[0018] The converter outputs a fault signal while controlling the disconnection between the generator set and the energy-consuming resistor;

[0019] The programmable logic controller controls the air inlet valve of the expander to close and controls the air exhaust valve of the expander to open according to the fault signal.

[0020] Optionally, the generator set further includes a generator and an evaporator;

[0021] The generator is connected to the expander, and the generator is a permanent magnet synchronous generator;

[0022] The evaporator is connected to the expander, and the evaporator inputs an organic working medium into the expander.

[0023] In a second aspect, an embodiment of the present invention further provides a method for preventing a waste heat utilization generator set from running away, the method being executed by a waste heat utilization generator set preventing running away device in any embodiment of the present invention, the method comprising:

[0024] When the output voltage of the generator set exceeds the threshold voltage, the converter controls the generator set to be disconnected from the energy-consuming resistor, and controls the alarm branch to be powered on;

[0025] The brake circuit controls the connection between the generator set and the energy-consuming resistor according to the power-on of the alarm branch.

[0026] Optionally, the braking circuit controls the connection between the generator set and the energy-consuming resistor according to the power-on of the alarm branch, including:

[0027] The coil of the relay controls the normally open contact of the relay to be attracted according to the power-on of the alarm branch, and the coil of the first circuit breaker controls the contact of the first circuit breaker to be attracted according to the attraction of the normally open contact of the relay.

[0028] Optionally, when the output voltage of the generator set exceeds a threshold voltage, the converter controls the generator set to be disconnected from the energy-consuming resistor and further comprises: outputting a fault signal;

[0029] The programmable logic controller controls the air inlet valve of the expander to close and controls the air exhaust valve of the expander to open according to the fault signal.

[0030] In a third aspect, an embodiment of the present invention further provides a waste heat utilization generator set, which includes a waste heat utilization generator set anti-runaway device as in any embodiment of the present invention.

[0031] The device for preventing the runaway of the waste heat utilization generator set provided by the embodiment of the present invention comprises a converter, the converter comprises an alarm branch, and the converter controls the disconnection between the generator set and the energy-consuming resistor when the output voltage of the generator set exceeds the threshold voltage, and controls the power on of the alarm branch. By setting a braking circuit, the braking circuit controls the connection between the generator set and the energy-consuming resistor according to the power on of the alarm branch; that is, at the moment when the converter disconnects the generator set from the energy-consuming resistor, the converter controls the power on of the alarm branch, and at the same time, the braking circuit controls the connection between the generator set and the energy-consuming resistor according to the power on of the alarm branch, so that in the process of closing the expander intake valve and opening the expander exhaust valve, the generator set and the energy-consuming resistor remain connected, and the energy-consuming resistor acts as a braking resistor to release the speed of the generator set, thereby effectively preventing the generator set from running away in the process of closing the expander intake valve and opening the expander exhaust valve, and then after the actions of closing the expander intake valve and opening the expander exhaust valve are completed, the expander intake valve is closed and the exhaust valve is opened, and the speed of the generator set is safely reduced, ensuring the safety of the generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 2 is a schematic structural diagram of a device for preventing runaway of a waste heat-utilizing generator set provided by an embodiment of the present invention;

[0033] Figure 2 yes Figure 1 The schematic diagram of the structure of the device for preventing runaway of a waste heat utilization generator set when the output voltage of the generator set exceeds the threshold voltage is shown;

[0034] Figure 3 2 is a schematic structural diagram of another device for preventing runaway of a waste heat-utilizing generator set provided by an embodiment of the present invention;

[0035] Figure 4 2 is a schematic structural diagram of another device for preventing runaway of a waste heat-utilizing generator set provided by an embodiment of the present invention;

[0036] Figure 5 It is a structural schematic diagram of another device for preventing runaway of a waste heat-utilizing generator set provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] Figure 1 Schematic diagram of a device for preventing runaway of a waste heat generating set provided by an embodiment of the present invention, with reference to Figure 1The device for preventing runaway of the waste heat utilization generator set includes:

[0039] The converter 30 includes an alarm branch 31; the generator set 10 is electrically connected to the energy dissipation resistor 20 through the converter 30; when the output voltage of the generator set 10 exceeds the threshold voltage, the converter 30 controls the generator set 10 to be disconnected from the energy dissipation resistor 20, and controls the alarm branch 31 to be powered on;

[0040] The brake circuit 40 , the generator set 10 is electrically connected to the energy-consuming resistor 20 through the brake circuit 40 ; the brake circuit 40 is connected in parallel with the alarm branch 31 , and the brake circuit 40 controls the connection between the generator set 10 and the energy-consuming resistor 20 according to the power-on of the alarm branch 31 .

[0041] Specifically, in the generator set 10, the exhaust valve of the expander is closed and the intake valve of the expander is opened, so that the evaporator inputs high-temperature and high-pressure organic working fluid into the expander and the expander uses the organic working fluid to perform external work, thereby driving the generator 13 to rotate, and the rotation speed of the generator 13 is approximately the rotation speed of the generator set 10.

[0042] The converter 30 can monitor the output voltage of the generator set 10, for example, monitor in real time whether the output voltage of the generator set 10 exceeds the threshold voltage, and the specific value of the threshold voltage can be set in advance in the converter 30. An alarm branch 31 is set in the converter 30. When the converter 30 detects that the output voltage of the generator set 10 exceeds the threshold voltage, the converter 30 shows a fault, that is, the converter 30 can disconnect the connection between the generator set 10 and the energy-consuming resistor 20, and at the same time, the alarm branch 31 in the converter 30 is energized, and the exhaust valve of the expander is controlled to open and the intake valve is closed. When the alarm branch 31 is energized, current flows through the alarm branch 31. At this time, if an alarm device, such as an alarm indicator light, is set in the alarm branch 31, the alarm device or the alarm indicator light can send an alarm to the outside to indicate that the output voltage of the generator set 10 exceeds the threshold voltage. The exhaust valve of the expander is controlled to open and the intake valve is controlled to close, so that the evaporator stops inputting the organic working medium into the expander, and the expander releases the organic working medium, thereby reducing the external work of the expander and reducing the speed of the generator set 10. The brake circuit 40 is electrically connected in parallel with the alarm branch 31, so when the alarm branch 31 is energized, the brake circuit 40 is turned on, so that the generator set 10, the brake circuit 40 and this branch of the energy-consuming resistor 20 are turned on.

[0043] When the output voltage of the generator set 10 does not exceed the threshold voltage, Figure 1As shown, the generator set 10 is electrically connected to the energy-consuming resistor 20 through the converter 30, the generator set 10 outputs power to the energy-consuming resistor 20 through the converter 30, the alarm branch 31 is not powered on, no current flows through the alarm branch 31, the brake circuit 40 is not turned on, the generator set 10, the brake circuit 40 and this branch of the energy-consuming resistor 20 are disconnected, and the energy-consuming resistor 20 is, for example, an electrical load.

[0044] When the output voltage of the generator set 10 exceeds the threshold voltage, Figure 2 As shown, Figure 2 yes Figure 1 The structure diagram of the device for preventing runaway of the residual heat utilizing generator set when the output voltage of the generator set 10 exceeds the threshold voltage is shown. When the speed of the generator set 10 increases so that the output voltage of the generator set 10 exceeds the threshold voltage, the converter 30 fails, that is, the converter 30 controls the generator set 10 to disconnect the electrical connection with the energy-consuming resistor 20, and controls the alarm branch 31 to be powered on and controls the intake valve of the expander to be closed and the exhaust valve to be opened. Then, the brake circuit 40 is turned on, that is, the generator set 10, the brake circuit 40 and this branch of the energy-consuming resistor 20 are turned on, so that The generator set 10 is electrically connected to the energy-consuming resistor 20 during the process of closing the intake valve of the expander and opening the exhaust valve. The energy-consuming resistor 20 acts as a braking resistor to release the rotation speed of the generator set 10, thereby effectively preventing the generator set 10 from running away during the process of closing the intake valve of the expander and opening the exhaust valve of the expander. After the actions of closing the intake valve of the expander and opening the exhaust valve of the expander are completed, the intake valve of the expander is closed and the exhaust valve is opened, and the rotation speed of the generator set 10 is safely reduced, thereby ensuring the safety of the generator set 10. After the rotation speed of the generator set 10 is safely reduced to a stop due to the closing of the intake valve of the expander and the opening of the exhaust valve, the inverter 30 can be manually reset. When the inverter 30 is reset, the alarm branch 31 is powered off, so that the brake circuit 40 is not conducting, and the generator set 10 can return to normal operation. Figure 1 The situation shown.

[0045] In summary, the technical solution of the embodiment of the present invention is to set a braking circuit 40, and the braking circuit 40 is electrically connected in parallel with the alarm branch 31 of the converter 30. When the generator set 10 fails due to the output voltage exceeding the threshold voltage and the converter 30 fails, the braking circuit 40 conducts the electrical connection between the generator set 10 and the energy-consuming resistor 20 according to the power-on of the alarm branch 31, so that the generator set 10 maintains an electrical connection with the energy-consuming resistor 20 during the process of closing the intake valve and opening the exhaust valve of the expander. The energy-consuming resistor 20 acts as a braking resistor to release the rotation speed of the generator set 10, thereby effectively preventing the generator set 10 from running away during the process of closing the intake valve of the expander and opening the exhaust valve of the expander.

[0046] Optionally, Figure 3 is a schematic diagram of another device for preventing runaway of a waste heat generating set provided by an embodiment of the present invention, with reference to Figure 3 The braking circuit 40 includes a relay 41 and a first circuit breaker 42; one end of the coil of the relay 41 is electrically connected to the first end of the alarm branch 31, and the other end of the coil of the relay 41 is electrically connected to the second end of the alarm branch 31; one end of the normally open contact K of the relay 41 is electrically connected to the first end of the alarm branch 31, and the other end of the normally open contact K of the relay 41 is electrically connected to the second end of the alarm branch 31 through the coil of the first circuit breaker 42; one end of the contact Q of the first circuit breaker 42 is electrically connected to the generator set 10, and the other end of the contact Q of the first circuit breaker 42 is electrically connected to the energy consumption resistor 20.

[0047] Specifically, when the output voltage of the generator set 10 exceeds the threshold voltage, the converter 30 disconnects the electrical connection between the generator set 10 and the energy-consuming resistor 20 at the moment, the alarm branch 31 is powered on, and the coil of the relay 41 is energized, so that the normally open contact K of the relay 41 is attracted, and then the coil of the first circuit breaker 42 is energized, so that the contact Q of the first circuit breaker 42 is attracted, and the brake circuit 40 is turned on. The generator set 10, the brake circuit 40 and this branch of the energy-consuming resistor 20 are turned on, and the energy-consuming resistor 20 acts as a brake resistor to release the rotation speed of the generator set 10, thereby effectively preventing the generator set 10 from running away during the process of closing the expander intake valve and opening the expander exhaust valve.

[0048] Optionally, refer to Figure 3 The alarm branch 31 includes a fault indicator light 310 , a first end of the fault indicator light 310 serves as a first end of the alarm branch 31 , and a second end of the fault indicator light 310 serves as a second end of the alarm branch 31 .

[0049] Specifically, when the alarm branch 31 is energized, current flows through the alarm branch 31 , and the fault indicator light 310 is energized. The fault indicator light 310 can send out an alarm to indicate that the output voltage of the generator set 10 exceeds the threshold voltage or indicates that the converter 30 is faulty.

[0050] Optionally, Figure 4 is a schematic diagram of another device for preventing runaway of a waste heat generating set provided by an embodiment of the present invention, with reference to Figure 4 The converter 30 also includes a grid-side circuit breaker 32, a machine-side circuit breaker 34 and a rectifier-inverter module 33; the generator set 10 is connected to the energy-consuming resistor 20 in sequence through the machine-side circuit breaker 34, the rectifier-inverter module 33 and the grid-side circuit breaker 32; when the output voltage of the generator set 10 exceeds the threshold voltage, the converter 30 controls the grid-side circuit breaker 32 and the machine-side circuit breaker 34 to be disconnected, so as to control the disconnection between the generator set 10 and the energy-consuming resistor 20.

[0051] Specifically, the converter 30 in this embodiment can monitor the output voltage of the generator set 10, and disconnect the electrical connection between the generator set 10 and the energy-consuming resistor 20 when the output voltage of the generator set 10 exceeds the threshold voltage, and control the alarm branch 31 to be powered on, and control the exhaust valve of the expander to open and the intake valve to close. Therefore, the converter 30 that can have the above functions can be applied to this embodiment. Among them, the converter 30 includes a grid-side circuit breaker 32, a machine-side circuit breaker 34, and a rectifier-inverter module 33. The converter 30 is based on the rectifier-inverter module 33. When the output voltage of the generator set 10 exceeds the threshold voltage, the grid-side circuit breaker 32 and the machine-side circuit breaker 34 are disconnected to control the disconnection between the generator set 10 and the energy-consuming resistor 20.

[0052] Optionally, Figure 5 is a schematic diagram of another device for preventing runaway of a waste heat generating set provided by an embodiment of the present invention, with reference to Figure 5 The generator set 10 includes a programmable logic controller 11 and an expander 12; the converter 30 outputs a fault signal while controlling the disconnection between the generator set 10 and the energy-consuming resistor 20; the programmable logic controller 11 controls the closing of the intake valve of the expander 12 and the opening of the exhaust valve of the expander 12 according to the fault signal.

[0053] Specifically, the programmable logic controller 11 is used to control the opening or closing of the intake valve and the exhaust valve of the expander 12. When the output voltage of the generator set 10 exceeds the threshold voltage, the converter 30 outputs a fault signal to the programmable logic controller 11, and the programmable logic controller 11 controls the intake valve of the expander 12 to close and the exhaust valve of the expander 12 to open according to the fault signal, so that the evaporator 14 stops inputting the organic working medium to the expander 12, and the expander 12 releases the organic working medium, thereby reducing the external work of the expander 12 and reducing the speed of the generator set 10. Here, the programmable logic controller 11 controls the entire action of the intake valve of the expander 12 to be completely closed and the exhaust valve to be completely opened according to the fault signal (usually 4 seconds), which is longer than the time for the generator set 10 to go from the rated speed to the overspeed (usually 1-2 seconds).

[0054] Optionally, continue to refer to Figure 5 The generator set 10 also includes a generator 13 and an evaporator 14; the generator 13 is connected to the expander 12, and the generator 13 is a permanent magnet synchronous generator; the evaporator 14 is connected to the expander 12, and the evaporator 14 inputs organic working fluid to the expander 12.

[0055] Specifically, the evaporator 14 is used to provide high-temperature and high-pressure organic working fluid to the expander 12, and the expander 12 performs work externally according to the organic working fluid, thereby driving the generator 13 to rotate, so that the generator 13 outputs voltage. Under normal circumstances, the generator 13 outputs power to the energy-consuming resistor 20 through the converter 30, and when the output voltage of the generator 13 exceeds the rated voltage, the converter 30 disconnects the electrical connection between the generator 13 and the energy-consuming resistor 20 and controls the alarm branch 31 to be powered on, and controls the exhaust valve of the expander 12 to open and the intake valve to close through the programmable logic controller 11, and the brake circuit 40 is turned on due to the alarm branch 31 being powered on, so that the brake circuit 40 keeps the generator 13 and the energy-consuming resistor 20 electrically connected during the process of the expander 12 opening the exhaust valve and closing the intake valve, and the energy-consuming resistor 20 acts as a brake resistor to release the speed of the generator set 10, thereby effectively preventing the generator set 10 from running away during the process of closing the intake valve of the expander 12 and opening the exhaust valve of the expander 12. In addition, the generator 13 in this embodiment may be a permanent magnet synchronous generator or other generators, which is not specifically limited in this embodiment.

[0056] An embodiment of the present invention also provides a method for preventing a waste heat utilization generator set from running away. The method is executed by a waste heat utilization generator set prevention device in any embodiment of the present invention. The method includes: when the output voltage of the generator set 10 exceeds a threshold voltage, the inverter 30 controls the generator set 10 to be disconnected from the energy-consuming resistor 20, and controls the alarm branch 31 to be powered on; the braking circuit 40 controls the generator set 10 to be connected to the energy-consuming resistor 20 according to the power-on of the alarm branch 31.

[0057] Specifically, when the output voltage of the generator set 10 exceeds the threshold voltage, the inverter 30 controls the electrical connection between the generator set 10 and the energy-consuming resistor 20 to be disconnected, and controls the alarm branch 31 to be powered on. The braking circuit 40 controls the electrical connection between the generator set 10 and the energy-consuming resistor 20 according to the power-on of the alarm branch 31, so that the energy-consuming resistor 20 acts as a braking resistor to release the rotation speed of the generator set 10, thereby effectively preventing the generator set 10 from running away during the process of closing the intake valve of the expander 12 and opening the exhaust valve of the expander 12.

[0058] Optionally, the braking circuit 40 controls the connection between the generator set 10 and the energy-consuming resistor 20 according to the power-on of the alarm branch 31, including: the coil of the relay 41 controls the normally open contact K of the relay 41 to be closed according to the power-on of the alarm branch 31, and the coil of the first circuit breaker 42 controls the contact Q of the first circuit breaker 42 to be closed according to the normally open contact K of the relay 41 being closed.

[0059] Optionally, when the output voltage of the generator set 10 exceeds a threshold voltage, the converter controls the disconnection between the generator set 10 and the energy-consuming resistor 20 and also includes: outputting a fault signal; the programmable logic controller 11 controls the closing of the intake valve of the expander 12 and the opening of the exhaust valve of the expander 12 according to the fault signal.

[0060] The embodiment of the present invention further provides a waste heat utilization generator set, which includes a waste heat utilization generator set anti-runaway device as in any embodiment of the present invention. The waste heat utilization generator set anti-runaway method, the waste heat utilization generator set anti-runaway device and the waste heat utilization generator set provided in the embodiment of the present invention belong to the same inventive concept, and thus can achieve the same technical effect, and the repeated contents will not be repeated here.

[0061] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A device for preventing runaway of a waste heat generating set, characterized in that: include: A converter, wherein the converter comprises an alarm branch; the generator set is electrically connected to an energy-consuming resistor through the converter; when the output voltage of the generator set exceeds a threshold voltage, the converter controls the generator set to be disconnected from the energy-consuming resistor and controls the alarm branch to be powered on; A braking circuit, wherein the generator set is electrically connected to the energy-consuming resistor through the braking circuit; the braking circuit is connected in parallel with the alarm branch, and the braking circuit controls the connection between the generator set and the energy-consuming resistor according to the power-on of the alarm branch; The brake circuit includes a relay and a first circuit breaker; One end of the coil of the relay is electrically connected to the first end of the alarm branch, and the other end of the coil of the relay is electrically connected to the second end of the alarm branch; One end of the normally open contact of the relay is electrically connected to the first end of the alarm branch, and the other end of the normally open contact of the relay is electrically connected to the second end of the alarm branch through the coil of the first circuit breaker; One end of the contact of the first circuit breaker is electrically connected to the generator set, and the other end of the contact of the first circuit breaker is electrically connected to the energy dissipation resistor; The converter also includes a grid-side circuit breaker, a machine-side circuit breaker and a rectifier-inverter module; The generator set is connected to the energy-consuming resistor in sequence through the generator-side circuit breaker, the rectifier-inverter module and the grid-side circuit breaker; The converter controls the grid-side circuit breaker and the machine-side circuit breaker to be disconnected when the output voltage of the generator set exceeds a threshold voltage, so as to control the disconnection between the generator set and the energy-consuming resistor; The generator set includes a programmable logic controller and an expander; The converter outputs a fault signal while controlling the disconnection between the generator set and the energy-consuming resistor; The programmable logic controller controls the air inlet valve of the expander to close and controls the air exhaust valve of the expander to open according to the fault signal.

2. The device for preventing runaway of a waste heat utilization generator set according to claim 1, characterized in that: The alarm branch includes a fault indicator light, a first end of the fault indicator light serves as the first end of the alarm branch, and a second end of the fault indicator light serves as the second end of the alarm branch.

3. The device for preventing runaway of a waste heat generating set according to claim 1, characterized in that: The generator set also includes a generator and an evaporator; The generator is connected to the expander, and the generator is a permanent magnet synchronous generator; The evaporator is connected to the expander, and the evaporator inputs an organic working medium into the expander.

4. A method for preventing runaway of a waste heat generating set, characterized in that: The method is performed by the device for preventing runaway of a waste heat utilization generator set according to any one of claims 1 to 3, and comprises: When the output voltage of the generator set exceeds the threshold voltage, the converter controls the generator set to be disconnected from the energy-consuming resistor, and controls the alarm branch to be powered on; The brake circuit controls the connection between the generator set and the energy-consuming resistor according to the power-on of the alarm branch.

5. The method for preventing runaway of a waste heat utilization generator set according to claim 4, characterized in that: The braking circuit controls the connection between the generator set and the energy-consuming resistor according to the power-on of the alarm branch, including: The coil of the relay controls the normally open contact of the relay to be attracted according to the power-on of the alarm branch, and the coil of the first circuit breaker controls the contact of the first circuit breaker to be attracted according to the attraction of the normally open contact of the relay.

6. The method for preventing runaway of a waste heat utilization generator set according to claim 5, characterized in that: The converter controls the disconnection between the generator set and the energy-consuming resistor when the output voltage of the generator set exceeds the threshold voltage, and further comprises: outputting a fault signal; The programmable logic controller controls the air inlet valve of the expander to close and controls the air exhaust valve of the expander to open according to the fault signal.

7. A waste heat utilization power generation unit, characterized in that: It comprises the device for preventing runaway of a waste heat utilization generator set as claimed in any one of claims 1 to 3.

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