CN113452140B - Generator motor outlet open circuit control device and control method - Google Patents
Generator motor outlet open circuit control device and control method Download PDFInfo
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- CN113452140B CN113452140B CN202110602459.9A CN202110602459A CN113452140B CN 113452140 B CN113452140 B CN 113452140B CN 202110602459 A CN202110602459 A CN 202110602459A CN 113452140 B CN113452140 B CN 113452140B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
The present disclosure provides a generator motor outlet disconnection control apparatus and a control method thereof. The control device comprises a monitoring system, an intelligent brake separating controller and a brake separating assembly, wherein the monitoring system is used for monitoring the working state of the generator motor and issuing an electrical accident brake separating instruction to the brake separating assembly or issuing a non-electrical accident brake separating instruction to the intelligent brake separating controller; the intelligent brake separating controller is used for acquiring real-time active power of the generator motor, performing brake separating judgment according to the real-time active power, and issuing a non-electrical brake separating control instruction to the brake separating assembly when a non-electrical brake separating condition is met; the opening assembly comprises at least one opening coil and is used for executing opening operation at the outlet of the generator motor according to the electrical accident opening command or the non-electrical opening control command.
Description
Technical Field
The disclosure relates to the technical field of power resources, in particular to a generator motor outlet open circuit control device and a control method.
Background
In order to ensure safe operation of a power grid and a Generator set, a pumped storage unit is usually equipped with a Generator motor outlet Circuit Breaker (GCB), and when the Generator set has an electrical fault, the Generator motor outlet Circuit Breaker can quickly cut off electrical connection with the power grid, so that the accident range is prevented from being expanded. The GCB is also used as a merging point of a unit normally connected with a power grid and a breaking point of a power grid normally disconnected, and can also perform opening control of normal shutdown when no electric appliance fails.
During normal shutdown, a control strategy of reducing the active power of the generator motor and then switching off is mostly adopted, and switching-off control is required to be carried out when the active power is in a specific power range, so that the influence on the service life of GCB equipment is reduced. In the related opening control method, active power information of the generator motor is obtained through a power transmitter and an alternating current sampling table, influence factors of unfixed delay exist, in addition, the situation of active power reduction change of the generator motor is complex, and the related opening control method is difficult to accurately control GCB opening time.
Disclosure of Invention
In view of the above, the present disclosure provides a generator motor outlet disconnection control device and a control method.
In a first aspect, the present disclosure provides a generator motor outlet trip control apparatus.
The control device comprises a monitoring system, an intelligent brake separating controller and a brake separating assembly;
the monitoring system is used for monitoring the working state of the generator motor and issuing an electrical accident opening instruction to the opening component or issuing a non-electrical accident opening instruction to the intelligent opening controller according to the working state;
the intelligent brake separating controller is used for acquiring real-time active power of the generator motor, performing brake separating judgment according to the real-time active power after receiving the non-electrical accident brake separating instruction, and issuing a non-electrical brake separating control instruction to the brake separating assembly when the non-electrical brake separating condition is met;
the opening component comprises at least one opening coil and is used for receiving the electrical accident opening instruction and the non-electrical opening control instruction and executing opening operation at the outlet of the generator motor according to the electrical accident opening instruction or the non-electrical opening control instruction.
In a second aspect, the present disclosure provides a control method applied to the control apparatus of the first aspect.
The method comprises the following steps:
the monitoring system monitors the generator motor to determine the working state of the generator motor;
responding to the condition that the generator motor is in an electrical accident open circuit state, and sending an electrical accident opening instruction to the opening assembly by the monitoring system;
the opening component controls the opening of a circuit breaker at the outlet of the generating motor according to the electrical accident opening instruction;
responding to the situation that the generator motor is in a non-electric accident open circuit state, and the monitoring system sends a non-electric accident opening instruction to the intelligent opening controller;
after the intelligent brake-separating controller receives the non-electrical accident brake-separating instruction, brake-separating judgment is carried out according to the real-time active power of the generator motor, and a non-electrical brake-separating control instruction is issued to the brake-separating finger assembly when the non-electrical brake-separating condition is met;
and the opening component controls the opening of the generator motor outlet breaker according to the non-electric opening control instruction.
As can be seen from the above, according to the device and method for controlling the outlet open circuit of the generator motor, the real-time active power of the generator motor is obtained by using the intelligent opening controller, and opening judgment is performed according to the real-time active power, so that the influence of delay factors existing in the related active power information acquisition method can be effectively avoided, the total delay of active power acquisition and opening control is effectively reduced, the control precision of the active power during opening of the outlet breaker of the generator motor is improved, and the opening time is accurately controlled.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a curve showing the variation of the opening of a guide vane of a generator motor, the variation of active power and the expected variation of the GCB position during shutdown in the water pumping direction;
fig. 2 is a schematic structural diagram of an outlet disconnection control device for a generator motor according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an outlet trip control device for a generator motor according to an embodiment of the disclosure;
fig. 4 is a schematic diagram illustrating a generator motor outlet open-circuit control method according to an embodiment of the disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by one having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In order to ensure safe operation of the power grid and the Generator set, the pumped storage unit is usually equipped with a Generator motor outlet Circuit Breaker (GCB), and when the Generator set has an electrical fault, the Generator motor outlet Circuit Breaker can quickly cut off electrical connection with the power grid, so as to avoid an expanded accident range. The GCB is also used as a merging point for the normal connection of the unit with the power grid and a breaking point for the normal disconnection of the power grid, and can also perform the opening control of the normal shutdown when no electric appliance fails.
During normal shutdown, a control strategy of reducing the active power of the generator motor and then switching off is mostly adopted, and switching-off control is required to be carried out when the active power is in a specific power range, so that the influence on the service life of GCB equipment is reduced. Active power information of the generator motor is obtained through two modes of a power transmitter and an alternating current sampling table in a related opening control method, and a certain delay exists in the process of collecting and storing analog quantity signals of a monitoring system, and the delay is not fixed and is usually 300ms to 500ms.
In addition, the active power of the generator motor is lowered and changed in a complex manner, the active power is lowered slowly when the generator motor is stopped in the generating direction, the GCB is controlled to be opened in a specific power range easily, the closing speed of the guide vane is high when the water pumping direction is stopped, the lowering speed of the active power is difficult to grasp, and as shown in fig. 1, in the water pumping direction stopping process of a unit with the capacity of 300MW, the opening degree change curve of the guide vane of the generator motor, the change curve of the active power and the expected change curve of the position of the GCB are obtained. The guide vane is closed by about 4.6% per second, the public power is about 100MW when the opening of the guide vane is 3.5%, the guide vane is in splash power operation when the guide vane is fully closed, the active power is about 60MW, the low power protection fixed value can be set to 70MW, the unit absorption power is controlled between 70MW and 100MW when the GCB is opened, the opening of the guide vane is 1% -3.5% when the GCB is opened, and the opening of the guide vane is reduced from 3.5% to about 0.5s when the GCB is 1% in use, namely the GCB is required to be controlled to be opened within 0.5 s. However, due to the delay of active power collection and storage, it is difficult to accurately control the switching-off time of the CGB.
Based on the reasons, the scheme of the invention changes the existing brake-separating control strategy, a special intelligent brake-separating controller is arranged to obtain accurate active power in real time, the monitoring system does not collect and judge the active power any more during normal brake-separating, a brake-separating instruction is directly issued to the intelligent brake-separating controller, and the intelligent brake-separating controller judges and determines the brake-separating time, so that the accurate control of CGB brake-separating is realized.
Based on the above inventive concept, in one aspect, the present disclosure provides a generator motor outlet trip control apparatus.
As shown in fig. 2, the generator motor outlet disconnection control apparatus provided in the embodiment of the present disclosure includes a monitoring system 201, an intelligent opening controller 202, and an opening component 203;
the monitoring system 201 is configured to monitor a working state of the generator motor, and determine whether the generator motor needs to be switched off due to an electrical accident shutdown or is switched off due to a normal shutdown caused by a non-electrical accident by monitoring the working state of the generator motor.
The monitoring system 201 directly sends an electrical accident opening instruction to the opening assembly 203 under the condition of electrical accident shutdown or sends a non-electrical accident opening instruction to the intelligent opening controller 202 under the condition of non-electrical accident normal shutdown according to the working state;
the intelligent brake separating controller 202 is configured to obtain real-time active power of the generator motor, perform brake separating judgment according to the real-time active power after receiving the non-electrical accident brake separating instruction, and issue a non-electrical brake separating control instruction to the brake separating assembly 203 when a non-electrical brake separating condition is met;
the opening component 203 includes at least one opening coil 2031, configured to receive the electrical accident opening command and the non-electrical opening control command, and execute an opening operation at an outlet of the generator motor according to the electrical accident opening command or the non-electrical opening control command.
According to the generator motor outlet open circuit control device, the intelligent brake separating controller is used for obtaining the real-time active power of the generator motor and brake separating judgment is carried out according to the real-time active power, and the influence of delay factors existing in related active power information acquisition methods can be effectively avoided, so that the total delay of active power acquisition and brake separating control is effectively reduced, the control precision of the active power during brake separating of the generator motor outlet breaker is improved, and the brake separating time is accurately controlled.
As shown in fig. 3, in some optional embodiments of the present disclosure, the intelligent switching controller 202 includes a current signal collecting module 2021 and a voltage signal collecting module 2022;
the current signal acquisition module 2021 is configured to acquire a real-time current signal of the generator motor, for example, the current signal acquisition module may be a CT current transformer, and may determine an actual working current of the generator motor according to an acquired mutual induction current;
the voltage signal acquisition module 2022 is configured to acquire a real-time voltage signal of the generator motor, for example, the voltage signal acquisition module may be a PT voltage transformer, and may determine an actual working voltage of the generator motor according to the acquired mutual-inductance voltage;
the intelligent opening controller 202 is configured to obtain real-time active power of the generator motor, and further includes:
the intelligent switching controller 202 is configured to calculate and determine the real-time active power according to the real-time current signal and the real-time voltage signal.
As shown in fig. 3, in some optional embodiments of the present disclosure, the intelligent switching controller 202 includes a commutation information collecting module 2023;
the commutation information acquisition module 2023 is configured to acquire position information of a commutation phase isolating switch in the generator motor, and determine a working direction of the generator motor according to the position information;
wherein the working direction comprises a power generation direction and a water pumping direction;
the intelligent opening controller 202 further comprises a power threshold input module 2024, and the power threshold input module 2024 is configured to obtain opening power thresholds corresponding to the power generation direction and the water pumping direction, respectively;
the intelligent opening controller 202 performs opening judgment according to the real-time active power, and further includes:
the intelligent switching controller 202 is configured to determine a switching power threshold corresponding to a current working direction, compare the real-time active power with the switching power threshold, and determine that a non-electrical switching condition is met when the real-time active power is smaller than the switching power threshold.
In some optional embodiments of the present disclosure, the intelligent opening controller 202 further includes a current self-diagnosis module and a voltage self-diagnosis module;
the current self-diagnosis module and the voltage self-diagnosis module are respectively used for carrying out disconnection self-diagnosis on the real-time current signal and the real-time voltage signal so as to ensure the accuracy of the signals.
In some optional embodiments of the present disclosure, the intelligent brake controller 202 further includes a control recording module;
the control recording module is used for acquiring and recording control event information so as to facilitate fault analysis and diagnosis when faults occur in the later period.
The control event information comprises active power information and working direction information of the generator motor, opening power threshold value information and non-electric opening control instruction information, and the non-electric opening control instruction information comprises non-electric appliance opening control instruction content, instruction time and the like.
Based on the same inventive concept, in one aspect, the present disclosure provides a control method applied to the generator motor outlet disconnection control apparatus.
As shown in fig. 4, a control method applied to a generator motor outlet open-circuit controller provided in an embodiment of the present disclosure includes:
s1: the monitoring system monitors the generator motor to determine the working state of the generator motor, wherein the working state of the generator motor comprises an electrical accident disconnection state and a non-electrical accident disconnection state. The electric appliance accident disconnection state refers to the condition that the generator motor needs to be subjected to brake separation due to electric accident shutdown, and the non-electric appliance accident disconnection state refers to the condition that the generator motor is subjected to brake separation due to normal shutdown of non-electric accidents.
S11: and responding to the condition that the generator motor is in an electric accident open circuit state, and the monitoring system sends an electric accident opening instruction to the opening assembly.
When the generator motor needs to be switched off due to an electrical accident, the monitoring system directly sends a switching-off instruction to the switching-off assembly so as to directly trigger a switching-off coil in the switching-off assembly as soon as possible to control and execute the switching-off operation.
S12: and the opening component controls the opening of the generator motor outlet breaker according to the electrical accident opening instruction.
S21: and responding to the situation that the generator motor is in a non-electric accident open circuit state, and the monitoring system sends a non-electric accident opening instruction to the intelligent opening controller.
When the generator motor is normally stopped due to a non-electrical accident, the monitoring system does not acquire and judge the active power of the generator motor any longer, and directly sends a non-electrical accident opening instruction to the intelligent opening controller.
S22: after the intelligent brake separating controller receives the non-electric accident brake separating instruction, brake separating judgment is carried out according to the real-time active power of the generator motor;
s23: when the non-electrical switching-off condition is met, a non-electrical switching-off control instruction is issued to the switching-off finger assembly;
s24: and the opening component controls the opening of the generator motor outlet circuit breaker according to the non-electric opening control instruction.
The control method applied to the generator motor outlet open circuit control device obtains real-time active power of a generator motor by using the intelligent brake-separating controller and carries out brake-separating judgment according to the real-time active power, and can effectively avoid the influence of delay factors existing in related active power information acquisition methods, thereby effectively reducing the total delay of active power acquisition and brake-separating control, improving the control precision of the active power when a breaker at the outlet of the generator motor is subjected to brake-separating, and accurately controlling the brake-separating time.
In some optional embodiments of the present disclosure, the intelligent opening controller obtains a real-time current signal and a real-time voltage signal of the generator motor;
and calculating and determining the real-time active power according to the real-time current signal and the real-time voltage signal.
In some optional embodiments of the present disclosure, the intelligent opening controller obtains position information of an isolated phase switch, and determines a current working direction of the generator motor and an opening power threshold corresponding to the current working direction according to the position information;
the intelligent brake separating controller carries out brake separating judgment according to the real-time active power of the generator motor, and further comprises:
and comparing the real-time active power with the opening power threshold, and judging that a non-electric opening condition is met when the real-time active power is smaller than the opening power threshold.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring embodiments of the present disclosure, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present disclosure are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that the embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations thereof will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures, such as Dynamic RAM (DRAM), may use the discussed embodiments.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.
Claims (8)
1. A generator motor outlet open circuit control device comprises a monitoring system, an intelligent brake separating controller and a brake separating assembly;
the monitoring system is used for monitoring the working state of the generator motor and issuing an electrical accident brake-separating instruction to the brake-separating assembly or issuing a non-electrical accident brake-separating instruction to the intelligent brake-separating controller according to the working state;
the intelligent brake separating controller is used for acquiring real-time active power of the generator motor, performing brake separating judgment according to the real-time active power after receiving the non-electric accident brake separating instruction, and issuing a non-electric brake separating control instruction capable of enabling the brake separating assembly to separate when the non-electric accident brake separating instruction is met;
the opening component comprises at least one opening coil and is used for receiving the electrical accident opening instruction and the non-electrical opening control instruction and executing opening operation at the outlet of the generator motor according to the electrical accident opening instruction or the non-electrical opening control instruction.
2. The control device according to claim 1, wherein the intelligent brake-separating controller comprises a current signal acquisition module and a voltage signal acquisition module;
the current signal acquisition module is used for acquiring a real-time current signal of the generator motor;
the voltage signal acquisition module is used for acquiring a real-time voltage signal of the generator motor;
the intelligent brake separating controller is used for obtaining real-time active power of the generator motor, and further comprises:
the intelligent brake separating controller is configured to calculate and determine the real-time active power according to the real-time current signal and the real-time voltage signal.
3. The control device according to claim 2, wherein the intelligent brake separating controller comprises a commutation information acquisition module;
the commutation information acquisition module is used for acquiring the position information of the commutation phase isolating switch and determining the working direction of the generator motor according to the position information;
wherein the working direction comprises a power generation direction and a water pumping direction;
the intelligent brake separating controller also comprises a power threshold value input module, and the power threshold value input module is used for acquiring brake separating power threshold values corresponding to the power generation direction and the water pumping direction respectively;
the intelligent brake separating controller carries out brake separating judgment according to the real-time active power, and further comprises:
the intelligent brake separating controller is configured to determine a brake separating power threshold corresponding to the current working direction, compare the real-time active power with the brake separating power threshold, and judge that a non-electrical brake separating condition is met when the real-time active power is smaller than the brake separating power threshold.
4. The control device according to claim 2, wherein the intelligent opening controller further comprises a current self-diagnosis module and a voltage self-diagnosis module;
the current self-diagnosis module and the voltage self-diagnosis module are respectively used for carrying out disconnection self-diagnosis on the real-time current signal and the real-time voltage signal so as to ensure the accuracy of the signals.
5. The apparatus of claim 3, wherein the intelligent split-gate controller further comprises a control recording module;
the control recording module is used for acquiring and recording control event information, wherein the control event information comprises active power information and working direction information of the generator motor, the opening power threshold value information and non-electric opening control instruction information.
6. A control method applied to the control device according to any one of claims 1 to 5, the method comprising:
the monitoring system monitors the generator motor to determine the working state of the generator motor;
responding to the condition that the generator motor is in an electrical accident open circuit state, and sending an electrical accident opening instruction to the opening assembly by the monitoring system;
the opening component controls the opening of the breaker at the outlet of the generating motor according to the electrical accident opening instruction;
responding to the situation that the generator motor is in a non-electric accident open circuit state, and the monitoring system sends a non-electric accident opening instruction to the intelligent opening controller;
after the intelligent brake-separating controller receives the non-electrical accident brake-separating instruction, brake-separating judgment is carried out according to the real-time active power of the generator motor, and a non-electrical brake-separating control instruction is issued to the brake-separating finger assembly when the non-electrical brake-separating condition is met;
and the opening component controls the opening of the generator motor outlet circuit breaker according to the non-electric opening control instruction.
7. The control method according to claim 6, wherein the intelligent opening controller acquires a real-time current signal and a real-time voltage signal of the generator motor;
and calculating and determining the real-time active power according to the real-time current signal and the real-time voltage signal.
8. The control method according to claim 7, wherein the intelligent brake separating controller acquires position information of a phase-change isolating switch, and determines the current working direction of the generator motor and a brake separating power threshold corresponding to the current working direction according to the position information;
the intelligent brake separating controller carries out brake separating judgment according to the real-time active power of the generator motor, and further comprises:
and comparing the real-time active power with the opening power threshold, and judging that a non-electrical opening condition is met when the real-time active power is smaller than the opening power threshold.
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| CN107884707B (en) * | 2017-09-30 | 2018-12-21 | 杨启蓓 | High-voltage circuit-breaker switching on-off time on-Line Monitor Device and method |
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