Non-inductive conversion system

Abstract

The utility model discloses a non-inductive conversion system, which relates to the field of electric power, and comprises a power supply module used for supplying power; the synchronous conversion module is used for synchronous grid connection and synchronous disconnection between different power supplies; the beneficial effects of the utility model are that the control unit determines the required generator set output voltage and phase angle according to the operation data, sends the required generator set output voltage and phase angle to the generator set controller, controls the operation of the switch unit according to the detected operation data, and carries out protection under abnormal conditions; the switch unit controls and switches an internal loop of the device according to operation data and cuts off a fault path when a fault occurs, through cooperative use of all the modules and the units, the rapid grid connection function of the power generation vehicle and synchronous switching between the mains supply and the power generation vehicle under the condition that the mains supply is not powered off are achieved, and the problems that an existing power generation vehicle access mode is large in workload and inconvenient to use are solved. And rapid and safe butt joint between the emergency power supply of the generator car and the power grid side cannot be realized, so that the access effect is poor.

Description

Technical Field

[0001] The utility model relates to the field of electric power, in particular to a non-sensing conversion system. Background Art

[0002] In recent years, with the continuous development and increasing intelligence of power systems, users have increasingly demanded higher reliability in power supply. Low-voltage distribution networks are increasingly being used for user access, emergency power supply, equipment inspection and maintenance, accident and defect handling, and upstream power grid maintenance needs. Low-voltage generator trucks are increasingly being used for emergency power supply and live bypass operations. Emergency generator trucks are characterized by rapid action, flexibility, safety, convenience, and strong environmental adaptability. They are highly capable of responding to sudden grid failures, which significantly impact the quality and efficiency of power restoration after power outages. They are a crucial means for power supply units to respond to grid emergencies, effectively avoiding or minimizing the impact of accidents.

[0003] When the generator set is connected to the mains to provide uninterrupted power supply to the low-voltage load, the low-voltage load experiences two power outages (average power outage of 2.5 hours). One is when the generator set is connected, the mains power is cut off first, and then the generator set is connected, and the generator set supplies power to the load first; after the mains power is restored, the power supply of the generator set is first disconnected, and there is a brief power outage at this time, and then the generator set is started to restore the generator set and power supply.

[0004] Obviously, the current method of connecting power generators to the grid is labor-intensive and time-consuming, and cannot achieve rapid and safe connection between the emergency power supply of the power generator and the grid side, resulting in poor senseless connection effect and reduced power supply reliability, which needs to be improved. Utility Model Content

[0005] The purpose of the present invention is to provide a sensorless conversion system to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A sensorless conversion system, comprising:

[0008] A power module, used for supplying power;

[0009] Synchronous conversion module, used for synchronous grid connection and synchronous disconnection between different power sources;

[0010] Circuit connection module, used for electrical connection between power module, synchronous conversion module and load module;

[0011] Load module, used for load working electricity;

[0012] The power module is connected to the load module via the circuit connection module, and the synchronous conversion module is connected to the power module via the circuit connection module;

[0013] The synchronous conversion module includes:

[0014] A detection unit is used to detect the operating data of the mains power supply and the generator set and send the data to the control unit;

[0015] The switch unit is used to receive control from the control unit and complete the switching of the power supply circuit;

[0016] Interface unit, used to establish connections between the synchronous conversion module and other devices;

[0017] The control unit is used to comprehensively control the operation of each unit and realize the sensorless conversion between the power supply of the power module and the emergency power supply;

[0018] Communication unit, used to establish data exchange between the control unit and the generator set and other related equipment;

[0019] The detection unit is connected to the control unit, and the control unit is connected to the switch unit, the interface unit, and the communication unit.

[0020] As a further solution of the present invention: the power supply module includes a mains power supply and a generator set, the mains power supply is connected to the switch unit through the interface unit, the first end of the generator set is connected to the switch unit through the interface unit, the second end of the generator set is connected to the first end of the generator controller, and the second end of the generator controller is connected to the control unit.

[0021] As a further solution of the present invention: the detection unit includes a voltage sensor and a current sensor, which are arranged at the port of the synchronous conversion module to detect the operating data of the AC power supply and the generator set, and send the detected data to the control unit.

[0022] As a further solution of the present invention: the switch unit includes a switch K1, a switch K2, and a switch K3. The first end of the switch K1 is connected to the power module through the interface unit, the second end of the switch K1 is connected to the first end of the switch K2 and the first end of the switch K3, the second end of the switch K2 provides the interface unit to connect to the power module, the second end of the switch K3 is connected to the load module through the interface unit, and the third end of the switch K3 is connected to the power module through the interface unit.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the control unit of the present invention determines the required generator set output voltage and phase angle according to the operating data and sends them to the generator set controller, and at the same time controls the operation of the switch unit according to the detected operating data, and performs protection under abnormal circumstances; the switch unit controls and switches the internal circuit of the device according to the operating data, and cuts off the faulty active path in the event of a fault. Through the coordinated use of various modules and units, the rapid grid connection function of the generator vehicle is realized without interruption of the mains power supply, and synchronous switching between the mains power and the generator vehicle is realized, which solves the technical problems that the existing generator vehicle access method has a large workload, a long time consumption, and cannot realize the rapid and safe connection between the emergency power supply of the generator vehicle and the grid side, resulting in poor access effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a sensorless conversion system.

[0025] Figure 2 This is the current flow diagram of the grid-connected working mode of the mains power supply / generator set sensorless conversion system.

[0026] Figure 3 This is the current flow diagram of the island working mode of the mains power supply / generator set sensorless conversion system. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 , a sensorless conversion system, comprising:

[0029] A power module for supplying power; the power source may specifically be a mains power source or an emergency power source (the emergency power source may be one or more of a generator set, a commercial power system, or an energy storage system. The following example uses a generator set on a power generation vehicle as an example of an emergency power source, but in actual use it is not limited to a generator set);

[0030] Synchronous conversion module, used for synchronous grid connection and synchronous disconnection between different power sources;

[0031] Circuit connection module, used for electrical connection between the power module, synchronous conversion module and load module (can be one or a combination of quick-change low-voltage cables, terminal clamps or copper busbars. Since the connection wire is the default device, it is not described in the following examples);

[0032] Load module, used for load working electricity;

[0033] The power module is connected to the load module via the circuit connection module, and the synchronous conversion module is connected to the power module via the circuit connection module;

[0034] The synchronous conversion module includes:

[0035] A detection unit is used to detect the operating data of the mains power supply and the generator set and send the data to the control unit;

[0036] The switch unit is used to receive control from the control unit and complete the switching of the power supply circuit;

[0037] Interface unit, used to establish connections between the synchronous conversion module and other devices;

[0038] The control unit is used to comprehensively control the operation of each unit and realize the sensorless conversion between the power supply of the power module and the emergency power supply;

[0039] Communication unit, used to establish data exchange between the control unit and the generator set and other related equipment;

[0040] The detection unit is connected to the control unit, and the control unit is connected to the switch unit, the interface unit, and the communication unit.

[0041] In the specific embodiment: see Figure 1 The interface unit is used to connect the synchronous conversion module and other modules, such as generator vehicles, low-voltage bypass cable operation vehicles, etc. It generally adopts the form of quick-change plug-in heads and is divided into input interface and output interface. The input interface is generally connected to commercial power systems, generator sets, energy storage systems, etc., and the output unit is generally connected to the load module.

[0042] The communication unit is used for data exchange between the synchronous conversion module and the generator set and other related equipment, and is generally an RS485 interface.

[0043] In the embodiment of the present invention, the sensorless conversion device of the power generation vehicle is taken as an example for explanation, which is used for the grid-connected operation of the mobile power generation vehicle to realize the function of quickly connecting the power generation vehicle to the mains without interruption of the mains power.

[0044] The detection unit detects the electrical signals of the mains power supply and the generator set, and generates operating data; the control unit determines the required generator set output voltage and phase angle based on the operating data and sends them to the generator set controller. At the same time, it controls the relevant switch operations based on the detected operating data and performs protection in abnormal situations; the switch unit controls and switches the internal circuits of the device based on the operating data, and cuts off the faulty circuit in the event of a fault. Through the coordinated use of various modules and units, the generator car can be quickly connected to the grid without interruption of the mains power supply, and synchronous switching between the mains power supply and the generator set (generator car) can be achieved. This solves the technical problems of the existing generator car access method, which is labor-intensive and time-consuming, and cannot achieve rapid and safe connection between the generator car emergency power supply and the grid side, resulting in poor access effect.

[0045] In this example: See Figure 1 The power supply module includes a mains power supply and a generator set. The mains power supply is connected to the switch unit through the interface unit. The first end of the generator set is connected to the switch unit through the interface unit. The second end of the generator set is connected to the first end of the generator controller. The second end of the generator controller is connected to the control unit.

[0046] The mains power supply and the introduced mains power, the generator set is the power supply for the power generation vehicle, and the synchronous switching between the mains power supply and the generator set (power generation vehicle) is achieved through the synchronous conversion module.

[0047] In this example: See Figure 1 The detection unit includes a voltage sensor and a current sensor, which are arranged at the port of the synchronous conversion module to detect the operating data of the mains power supply and the generator set, and send the detected data to the control unit.

[0048] When the mains operation data is inconsistent with the generator set voltage phase angle, the control unit sends the relevant data to the generator set controller. The generator set controller determines the output angle phase angle of the generator set based on the small current frequency locking technology (synchronous frequency locking technology that does not rely on the change of the current-carrying switch state) to ensure that the mains power supply phase angle is the same.

[0049] In this example: See Figure 1 The switch unit includes a switch K1, a switch K2, and a switch K3. The first end of the switch K1 is connected to the power module through the interface unit. The second end of the switch K1 is connected to the first end of the switch K2 and the first end of the switch K3. The second end of the switch K2 provides an interface unit to connect to the power module. The second end of the switch K3 is connected to the load module through the interface unit. The third end of the switch K3 is connected to the power module through the interface unit.

[0050] The closing or opening of switches K1, K2, and K3 is controlled by a control unit, and the grid-connected working mode and the island working mode are realized by closing or opening each switch.

[0051] In this example: See Figure 2 The sensorless conversion system includes a grid-connected working mode. In the grid-connected working mode, the AC power supply supplies power to the load module through the synchronous conversion module, and the generator set supplies power to the load module through the synchronous conversion module.

[0052] The dotted line in the figure represents the current flow line in the grid-connected working mode. The AC power supply and the generator set pass through the detection unit and the interface unit respectively and then reach the switch unit. After being combined in the switch unit, the load module is powered by the interface unit.

[0053] In this example: See Figure 3 The sensorless conversion system includes an island working mode. In the island working mode, the generator set supplies power to the load module through the synchronous conversion module, and the synchronous conversion module disconnects the circuit between the mains power supply and the load module.

[0054] The dotted line in the figure is the line through which the current flows in the island working mode, and the generator set, detection unit, interface unit, switch unit, interface unit and load module form a loop.

[0055] In this example: See Figure 1 The control unit detects whether there are any abnormal conditions such as voltage difference exceeding the limit or phase angle exceeding the limit between the mains power supply and the generator set operation data through the detection unit. If so, an alarm signal is output, and a control signal is output to control the switch unit to prohibit closing and stop the subsequent operation process. If not, the subsequent operation process is continued.

[0056] The subsequent operation process is introduced. Under normal circumstances, by controlling the closing status of each switch of the switch unit, the power supply status of the mains power supply and the generator set can be controlled to achieve grid-connected working mode or island working mode.

[0057] During the generator set connection phase, the operating data changes are used to determine whether there are any operating abnormalities, and corresponding protection controls are formulated and sent to the switch unit.

[0058] The working principle of the utility model is as follows: the power supply module is used to provide the load with mains power or emergency power; the synchronous conversion module is used for synchronous grid connection and synchronous decoupling between different power supplies; the circuit connection module is used for electrical connection between the power supply module, the synchronous conversion module and the load module; the load module is used for load working electricity; the synchronous conversion module includes: a detection unit for detecting the operating data of the mains power supply and the generator set, and sending it to the control unit; a switch unit for receiving the control of the control unit to complete the switching and switching of the power supply circuit; an interface unit for establishing the connection between the synchronous conversion module and other equipment; the control unit is used to comprehensively control the work of each unit to realize the senseless conversion of the power supply module and the emergency power supply; and the communication unit is used to establish data exchange between the control unit and the generator set and other related equipment.

[0059] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0060] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A sensorless conversion system, characterized in that: The sensorless conversion system includes: A power module, used for supplying power; Synchronous conversion module, used for synchronous grid connection and synchronous disconnection between different power sources; Circuit connection module, used for electrical connection between power module, synchronous conversion module and load module; Load module, used for load working electricity; The power module is connected to the load module via the circuit connection module, and the synchronous conversion module is connected to the power module via the circuit connection module; The synchronous conversion module includes: A detection unit is used to detect the operating data of the mains power supply and the generator set and send the data to the control unit; The switch unit is used to receive control from the control unit and complete the switching of the power supply circuit; Interface unit, used to establish connections between the synchronous conversion module and other devices; The control unit is used to comprehensively control the operation of each unit and realize the sensorless conversion between the power supply of the power module and the emergency power supply; Communication unit, used to establish data exchange between the control unit and the generator set and other related equipment; The detection unit is connected to the control unit, and the control unit is connected to the switch unit, the interface unit, and the communication unit.

2. The sensorless conversion system according to claim 1, characterized in that: The power supply module includes a mains power supply and a generator set. The mains power supply is connected to the switch unit through the interface unit. The first end of the generator set is connected to the switch unit through the interface unit. The second end of the generator set is connected to the first end of the generator controller. The second end of the generator controller is connected to the control unit.

3. The sensorless conversion system according to claim 1, characterized in that: The detection unit includes a voltage sensor and a current sensor, which are arranged at the port of the synchronous conversion module to detect the operating data of the mains power supply and the generator set, and send the detected data to the control unit.

4. The sensorless conversion system according to claim 1, characterized in that: The switch unit includes a switch K1, a switch K2, and a switch K3. The first end of the switch K1 is connected to the power module through the interface unit. The second end of the switch K1 is connected to the first end of the switch K2 and the first end of the switch K3. The second end of the switch K2 provides an interface unit to connect to the power module. The second end of the switch K3 is connected to the load module through the interface unit. The third end of the switch K3 is connected to the power module through the interface unit.

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