CN116470584A - Control system and method for diesel engine and diesel engine based on bypass relay - Google Patents

Control system and method for diesel engine and diesel engine based on bypass relay Download PDF

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Publication number
CN116470584A
CN116470584A CN202310651689.3A CN202310651689A CN116470584A CN 116470584 A CN116470584 A CN 116470584A CN 202310651689 A CN202310651689 A CN 202310651689A CN 116470584 A CN116470584 A CN 116470584A
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China
Prior art keywords
grid
load
inverter
energy
power
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Pending
Application number
CN202310651689.3A
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Chinese (zh)
Inventor
袁其玉
冯洪风
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AFORE NEW ENERGY TECHNOLOGY (SHANGHAI) CO LTD
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AFORE NEW ENERGY TECHNOLOGY (SHANGHAI) CO LTD
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Priority to CN202310651689.3A priority Critical patent/CN116470584A/en
Publication of CN116470584A publication Critical patent/CN116470584A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

The invention relates to a diesel engine control system based on a bypass relay, which comprises an alternating current power grid, an inverter, a relay, a load and a Chai Fa unit, wherein grid-connected operation of the system is realized through connection of the inverter and the power grid; off-grid operation of the system is realized through connection of the inverter and the diesel generator set; wherein the diesel generator set is controlled by a bypass relay; by sampling the voltage of the port of the diesel generator set, seamless switching between off-grid and grid connection is realized. The method of the invention controls the operation of the diesel generator set through the relay, can realize off-grid seamless switching in a smaller overshoot and a shorter time, ensures that the load or important load of a user can be continuously operated without being influenced by the fault or the power failure of the mains supply, and further improves the continuity and the reliability of the load power supply and the stability of the power grid.

Description

Control system and method for diesel engine and diesel engine based on bypass relay
Technical Field
The invention relates to a control method of a diesel generator set, in particular to a diesel generator control system based on a bypass relay and a control method thereof.
Background
With the increasing global energy crisis and environmental pollution problems, distributed energy sources such as solar energy, wind energy and the like are receiving more and more attention. And whether the distributed energy source can be fully utilized depends on the construction and development of the micro-grid. The micro-grid can gather the small-capacity power generation units, so that the instability of the generated power is reduced, independent safe and reliable power supply can be realized through self-management, and the micro-grid is a beneficial supplement of a large power grid. In the real-time running process of the micro-grid, the energy storage, the renewable energy power generation device, the load and the like are required to be regulated and controlled in real time, the micro-grid can run in a grid-connected mode with a large power grid system, and can run off-grid, so that the running of the micro-grid is required to be regulated by a related method for guaranteeing the power supply continuity of the load. How to realize grid connection and off-grid switching of the micro-grid, and on the basis, the micro-grid can generate the largest economic benefit, so that high-efficiency and stable voltage is brought to the load of the micro-grid, and a stable point network system is built with the lowest cost, which is one of the directions of the micro-grid research field.
The instability of the commercial power in the remote areas is an objective reality, however, the requirements of the areas on the stability of the commercial power are urgent, and particularly, the trouble caused by the instability of the commercial power is more obvious for communication service providers in the remote areas, and the grid connection and the off-grid are both objective requirements by installing a distributed power generation system in the remote areas. In practical application, the utility power is normally generated by the universal grid-connected inverter, and when the utility power fails, the universal controller supplements the storage battery with electric energy, so that a user can flexibly select to use direct current power supply according to practical requirements or realize alternating current power supply by configuring the off-grid inverter.
The distributed power sources such as photovoltaic power, wind power, energy storage and the like are often used as grid connection interfaces through inverters, and Chai Fa unit-inverter parallel power supply becomes a typical power supply configuration of an independent micro-grid system. In order to improve the safe and reliable running performance of the system, in a diesel generator set-inverter parallel power supply system, a Chai Fa set is generally used as a main power supply and is responsible for maintaining the stability of the voltage and the frequency of the system, an inverter is generally used as a secondary power supply and is connected into the system in a current source mode, and the output power of the inverter is regulated through upper energy management. Under the condition of high-power load abrupt disturbance, an inverter running in a current source mode does not have the capability of rapid power adjustment, so that a diesel generator set-inverter parallel power supply system is difficult to realize temporary steady-state power sharing among heterogeneous power supplies, and the high-power load abrupt disturbance mainly depends on the response of the diesel generator set, so that the voltage/frequency stability of a wind-solar-diesel energy storage multi-energy power generation micro-grid system containing a high-proportion power electronic power supply is severely challenged.
Therefore, it is necessary to provide a control method for switching between ac grid connection and off-grid seamless switching, so as to realize undisturbed switching of the load power supply; and furthermore, the grid-connected operation mode of the system is seamlessly switched to the off-grid operation mode when the alternating-current side power grid fails, and the continuity and reliability of load power supply are improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a diesel engine control system based on a bypass relay and a method thereof, which aim to realize the off-grid seamless switching with smaller overshoot and shorter time by controlling the operation of a diesel engine set through the relay, ensure that the load or important load of a user can be continuously operated without being influenced by the fault or the power failure of the mains supply, and further improve the persistence and the reliability of the load power supply and the stability of a power grid.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a control system is sent out to firewood based on bypass relay and is used for controlling the firewood generating set in the distributed power generation system, and this method includes following content:
preferably, the distributed power generation system consists of an alternating current power grid, an inverter, a relay, a load, a Chai Fa unit and the like, and grid-connected operation of the system is realized through connection of the inverter and the power grid; off-grid operation of the system is realized through connection of the inverter and the diesel generator set; wherein the diesel generator set is controlled by a bypass relay; by sampling the voltage of the port of the diesel generator set, seamless switching between grid connection and grid disconnection is realized.
Preferably, the grid-connected operation process of the distributed power generation system is that the Chai Fa unit is connected with the alternating current power grid through an inverter, the Chai Fa unit can supply power to a load, and additionally generated surplus electric energy can be stored in an accessed energy storage system and can be fed back to the connected alternating current power grid; similarly, the energy of the ac grid may be either supplied to the load or stored in an energy storage system.
Preferably, the off-grid operation process of the distributed power generation system is specifically that when the system needs to be actively off-grid or passively off-grid operation, the connection between the inverter and the alternating current power grid is disconnected, the energy storage system provides energy for a load, when the energy required by the load exceeds the stored energy, the Chai Fa unit starts to operate, and the energy storage system is charged while the load is powered.
Preferably, the Chai Fa unit is controlled by a bypass relay, when the alternating current power grid cannot supply power to the system and the connected energy storage system cannot meet the energy requirement of the load, the inverter sends a diesel-engine control signal (including starter control, communication control or dry-contact control and the like), the Chai Fa unit starts to operate, the relay control signal is sent to attract the relay to supply power to the load, and meanwhile, redundant energy is sent to the energy storage system for storage.
Preferably, voltage sampling of the Chai Fa unit port is specifically that the inverter collects voltage signals of the diesel generator unit port through a voltage sampling signal control line, the running condition of the diesel generator unit is detected in real time, the inverter is convenient to control the relay, and seamless switching control of grid connection and grid disconnection of the distributed power generation system is realized.
Preferably, the seamless switching process of grid connection and off-grid specifically comprises the following steps:
s1: when the system needs to be switched from a grid-connected state to a grid-off state to operate, the energy storage system provides electric energy for a load, and when the energy storage system is insufficient in energy supply, the inverter sends a signal through the diesel-electric communication control line to start the diesel-electric unit, and the Chai Fa unit starts to supply power;
s2: the inverter collects output voltage signals of the diesel generator set port, and the inverter adjusts the phase angle of the output voltage according to the collected voltage signals, so that the voltage required by the load is synchronous with the phase angle of the Chai Fa set voltage;
s3: after the voltage phase angles are synchronous, the inverter sends out a relay control signal to attract the relay, the diesel generator set starts to supply power to the load continuously, and redundant energy is sent to the energy storage system for storage, so that seamless switching between grid connection and off-grid operation of the system is realized.
Advantageous effects
Compared with the prior art, the invention provides a diesel engine control system and a diesel engine control method based on a bypass relay, and the diesel engine control system has the following beneficial effects:
1. by introducing the bypass relay to the diesel generator set to control the diesel generator set, the off-grid seamless switching is realized with smaller overshoot and shorter time, the stability of the system voltage is enhanced, and the stable voltage and frequency of the alternating current bus can be maintained so as to maintain uninterrupted power supply to the load.
2. By introducing strategies such as relay control, voltage signal sampling control and diesel-generator communication control to the inverter, the grid-connected operation mode of the system is seamlessly switched to the off-grid operation mode when the AC side power grid fails, no additional phase-locked loop or other measuring systems are required to be added to the traditional control, and the implementation mode is simple and convenient.
3. The control mode of the existing distributed system is conveniently updated and improved by adding the bypass relay to control the operation of the diesel generator set on the basis of the control mode of the existing system, hardware equipment is not required to be additionally added, a communication mode is not required to be modified, the control mode of the existing distributed system is easy to popularize and apply in direct engineering, and the requirement of a user on the diesel generating function is met.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a diesel engine control system based on a bypass relay in the method of the present invention;
FIG. 2 is a block diagram of a seamless switching control flow between grid-tie and off-grid of a distributed power generation system;
fig. 3 is a schematic diagram of a distributed generation system off-grid power generation solution networking.
Detailed Description
For the purpose of further illustrating the various embodiments, the invention provides drawings that are a part of the disclosure of the invention, primarily to illustrate the embodiments and, together with the description, serve to explain the principles of the embodiments, by referring to the same, it will be understood by those skilled in the art that other possible implementations and advantages of the invention may be achieved, the components in the drawings not being drawn to scale, and similar reference numerals being used to generally designate similar components.
A diesel engine control system based on a bypass relay and a method thereof control the operation of a diesel engine set through the bypass relay, realize the seamless switching of off-grid with smaller overshoot and shorter time, ensure that the load or important load of a user can be continuously operated without being influenced by the fault or the power failure of the mains supply, and further improve the persistence and the reliability of the load power supply and the stability of a power grid.
As shown in fig. 1, the distributed power generation system with relay-based diesel control in one embodiment of the present invention mainly includes an ac power grid, an inverter, a relay, a load, a Chai Fa unit, and the like. The grid-connected operation of the system is realized through the connection of the inverter and the power grid; off-grid operation of the system is realized through connection of the inverter and the diesel generator set; wherein the diesel generator set is controlled by a bypass relay; by sampling the voltage of the port of the diesel generator set, seamless switching between off-grid and grid connection is realized.
When the distributed power generation system is in grid-connected operation, a diesel generator set in the system is connected with an alternating current power grid through an inverter, and when the diesel generator set is in normal operation, the diesel generator set can supply power to a load to meet energy requirements, and additionally generated redundant electric energy can be stored in an accessed energy storage system and can be fed back to the connected alternating current power grid; similarly, when the commercial power is normal, the alternating current power grid supplies electric energy to the system through the universal grid-connected inverter, and the energy of the alternating current power grid can supply power to a load and can be stored in the energy storage system.
When the power grid fails, an independent off-grid system can be established for the failed area through the inverter, so that stable voltage and frequency of the alternating current bus can be maintained, uninterrupted power supply to the load can be maintained, and the inverter can be timely and reliably disconnected from the power grid when the system is abnormal. When the distributed power generation system needs to be actively off-grid or passively off-grid, the inverter is disconnected from the alternating current power grid, the energy storage system provides energy for the load at first, when the energy required by the load exceeds the energy stored by the energy storage system, the diesel generator set in the distributed power generation system starts to operate, the required electric energy is provided for the load, and meanwhile, the energy storage system can be charged when the energy generated by the diesel generator set is sufficient.
As can be seen from the schematic diagram of the diesel engine control system based on the bypass relay shown in fig. 1, the relay module in the system controls the on-off of the relay according to the effective control signal of the inverter. In the distributed power generation system, chai Fa units are controlled by bypass relays, when an alternating current power grid fails or the system is actively disconnected, mains supply cannot supply power to the system, and electric energy stored by an energy storage system connected in the system cannot meet energy requirements of loads, an inverter sends a diesel-electric control signal (including starter control, communication control or dry contact control and the like) at the moment, chai Fa units start to operate, meanwhile, the inverter sends a relay control signal to attract the relay, the diesel-electric units start to supply power to the loads, and meanwhile, redundant energy can be sent to the energy storage system for storage.
In addition, as shown in fig. 1, the inverter collects output voltage signals of the diesel generator set ports through a voltage sampling signal control line, and the output voltage signals comprise information such as phase, frequency and amplitude of voltage, so that the running condition of the diesel generator set is detected in real time, the inverter can conveniently and accurately control the on-off of the bypass relay, and the grid connection and off-grid seamless switching control of the distributed power generation system is realized.
The seamless switching process of grid connection and grid disconnection of the distributed power generation system is shown in fig. 3, and comprises the following steps:
s1: when the system needs to be switched from a grid-connected state to a grid-off state for operation, the connection between the inverter and the alternating current power grid is disconnected, the power grid cannot continuously provide energy for the system, at the moment, the energy storage system in the system firstly provides electric energy for a load, when the energy storage system is insufficient in energy supply, the inverter sends a signal through the diesel-electric communication control line to start the diesel-electric unit, and the Chai Fa unit starts to supply power;
s2: the inverter collects output voltage signals of the diesel generator set port through a voltage sampling signal control line, wherein the output voltage signals comprise information such as phase, frequency and amplitude of voltage, the inverter adjusts the phase angle of the output voltage according to the collected voltage signal information, and the phase angle of the voltage required by a load and the Chai Fa set voltage are synchronized;
s3: after the voltage required by the load is synchronous with the voltage phase angle of the Chai Fa unit, the inverter sends out a relay control signal to attract the relay, the diesel generator unit starts to supply power to the load continuously, and the redundant energy can be sent to the energy storage system for storage, so that the seamless switching between grid connection and off-grid operation of the system is realized.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or be integrated; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms in the invention will be understood by those of ordinary skill in the art.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (6)

1. The diesel engine control system based on the bypass relay comprises an alternating current power grid, an inverter, a relay, a load and a Chai Fa unit, and is characterized in that grid-connected operation of the system is realized through connection of the inverter and the power grid; off-grid operation of the system is realized through connection of the inverter and the diesel generator set; wherein the diesel generator set is controlled by a bypass relay; by sampling the voltage of the port of the diesel generator set, seamless switching between off-grid and grid connection is realized.
2. The diesel engine control system based on the bypass relay according to claim 1, wherein the grid-connected operation of the system is that a Chai Fa unit is connected with an alternating current power grid through an inverter, a Chai Fa unit can supply power to a load, and redundant electric energy can be stored in an accessed energy storage system and can be fed back to the alternating current power grid; the energy of the power grid can supply power to the load and can be stored in the energy storage system.
3. A diesel engine control system based on a bypass relay according to claim 1, wherein the off-grid operation of the system is characterized in that the energy storage system provides energy to the load when the connection between the inverter and the ac grid is broken, and the Chai Fa unit starts to operate when the energy required by the load exceeds the stored energy, and charges the energy storage system while powering the load.
4. The diesel engine control system based on the bypass relay according to claim 1, wherein the Chai Fa unit controls through the bypass relay, specifically, when the ac power grid cannot supply power to the system and the energy storage system connected to the ac power grid cannot meet the energy requirement of the load, the inverter sends a diesel engine control signal (including starter control, communication control or dry contact control, etc.), the Chai Fa unit starts to operate, and controls the relay to draw in at the same time, power the load, and the surplus energy is sent to the energy storage system for storage.
5. The diesel engine control system based on the bypass relay according to claim 1, wherein the voltage sampling of the port of the Chai Fa unit is specifically that the inverter collects the voltage signal of the port of the diesel engine unit through a voltage sampling signal control line, detects the running condition of the diesel engine unit in real time, facilitates the control of the relay by the inverter, and realizes the seamless switching control of grid connection and grid disconnection of the system.
6. The diesel engine control method based on the bypass relay according to claim 1, wherein the seamless switching process between grid connection and off-grid comprises the following steps:
s1: when the system is switched from a grid-connected state to a grid-off state to operate, the energy storage system cannot provide the energy requirement of a load, and the inverter sends a signal to start the diesel generator set through the diesel communication control line;
s2: the inverter collects output voltage signals of the diesel generator set port, and adjusts the phase angle of the output voltage according to the collected voltage signals, so that the voltage required by the load is synchronous with the phase angle of the Chai Fa set voltage;
s3: after the phase angles are synchronous, the relay is controlled to be attracted, the diesel generator set continuously supplies power to the load, and redundant energy is sent to the energy storage system for storage, so that seamless switching between grid connection and off-grid operation of the system is realized.
CN202310651689.3A 2023-06-05 2023-06-05 Control system and method for diesel engine and diesel engine based on bypass relay Pending CN116470584A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310651689.3A CN116470584A (en) 2023-06-05 2023-06-05 Control system and method for diesel engine and diesel engine based on bypass relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310651689.3A CN116470584A (en) 2023-06-05 2023-06-05 Control system and method for diesel engine and diesel engine based on bypass relay

Publications (1)

Publication Number Publication Date
CN116470584A true CN116470584A (en) 2023-07-21

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Country Status (1)

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