CN115473225B - User privacy active defense type electric energy conversion system and method - Google Patents

Abstract

The invention discloses a user privacy active defense type electric energy conversion system and a method, and relates to the technical field of new generation information. The interface unit provides power input and an electric equipment access port, and is connected with the electric energy conversion unit to form an energy channel. The central control unit uniformly dispatches the electric energy conversion unit and the electric energy storage unit and adjusts the voltage and the current of the power supply input port. The system presents electrical characteristics unrelated to actual operation of the power equipment, and actively defends the non-invasive detection equipment from stealing user privacy.

Description

User privacy active defense type power conversion system and method

Technical Field

The technology disclosed in the present invention relates to electric energy conversion, and in particular to a user privacy active defense type electric energy conversion system and method.

Background Art

Non-intrusive monitoring technology installs listening devices on the power user's home lines to identify the operating status of power equipment at different time periods, further analyze the user's equipment structure, power consumption behavior and habits, and provide a data basis for other business activities. This technology poses a great threat to the privacy of power users. Privacy leakage can cause users to suffer from frequent harassment from sales and advertising in mild cases, and can lead to adverse social problems and vicious crimes in severe cases. Therefore, it is crucial to actively defend against non-intrusive devices from obtaining user information from the source.

Summary of the invention

To solve the above problems, the present invention discloses a user privacy active defense type power conversion system and method. Through power storage and conversion technology, the key input signal required by non-intrusive monitoring equipment - the working current of the user's actual load is shielded, making the load identification function of the non-intrusive monitoring equipment invalid, thereby protecting user privacy and playing a role in actively defending user privacy leakage.

A user privacy active defense type power conversion system, the system comprises a central control unit, a power storage unit, a power conversion unit and an interface unit. The interface unit provides a power input and a power device access port, and is connected to the power conversion unit to form an energy channel. The central control unit uniformly dispatches the power conversion unit and the power storage unit to maintain the voltage and current of the power input port. The system exhibits electrical characteristics that are unrelated to the actual operation of the power device, and actively defends against non-invasive detection equipment from stealing user privacy.

The interface unit is divided into a power input port and a power supply port for electric equipment, and the power supply port includes an AC power supply port and a DC power supply port.

The power input port is externally connected to the output port of the user's electric meter, and the AC power port and the DC power port are externally used for the AC load and the DC load access of the user side, respectively. The interface unit is internally connected to the power conversion unit.

A user privacy active defense type power conversion method, the power conversion unit includes a rectifier module (AC-DC conversion), an inverter module (DC-AC conversion), a voltage regulator module (DC level regulation) and a commutation module (AC power switching). The input port of the interface unit is connected to the rectifier module to provide an energy source for the system; the AC power port is connected to the parallel output end of the inverter module and the commutation module to supply power to the AC load; the DC power port is connected to the voltage regulator module to supply power to the DC load.

The DC side of the rectifier module, inverter module and voltage regulator module are connected in parallel with the central control unit and the electric energy storage unit to a DC bus. The DC bus provides an uninterrupted power supply to the central control unit to ensure the normal operation of the central control unit and the voltage regulator module; that is, the central control unit and the voltage regulator module act as DC loads at any time. The electric energy storage unit and other electric energy conversion units connected in parallel have 4 working modes, and can switch between any two working modes.

Before switching modes, the user needs to select the load to be put into or out in the central control unit; referred to as variable load. There is communication between the power conversion unit and the central control unit, and the switching instructions between the working modes are determined by the central control unit according to the power of the variable load; wherein the central control unit stores all the user's load information with active power and reactive power as attributes, and the variable load is one of the loads stored in the central control unit.

The present invention is further improved: the four working modes are:

(1) Mode A (energy storage charging): The rectifier module is the only power source, supplying power to the AC power port through the converter module, charging the energy storage unit through the DC bus, and supplying power to the DC load;

(2) Mode B (AC heavy load): The rectifier module and the energy storage unit are used together as power sources. The rectifier module supplies power to the AC power port through the converter module. The energy storage unit supplements the power supply to the inverter module through the DC bus to supply power to the DC load.

(3) Mode C (DC heavy load): The rectifier module and the energy storage unit are used together as the power source. The rectifier module supplies power to the AC power port through the converter module. The energy storage unit and the rectifier module supply power to the DC load through the DC bus.

(4) Mode D (system off-grid): The rectifier module and converter module are out of operation, and the energy storage unit serves as the only power source, supplying power to the rectifier module and DC loads through the DC bus.

The working mode switching method is:

Mode A → Mode B: Take the constant current of the power input port of the rectifier module as the control target, switch the working mode of the energy storage unit to discharge, start the inverter module to supply power to the AC power port, and start the AC heavy load;

Mode A → Mode C: Take the constant current of the power input port of the rectifier module as the control target, switch the working mode of the energy storage unit to discharge, and start the DC heavy load;

Mode A → Mode D: Switch the working mode of the energy storage unit to discharge, set the working mode of the energy storage unit to off-grid, start the inverter module to supply power to the AC power port, exit the commutation module, and exit the rectifier module;

Mode B → Mode A: The control target is to keep the current of the power input port of the rectifier module constant, switch the working mode of the energy storage unit to charging, stop the AC heavy load, and the inverter module stops supplying power to the AC power port;

Mode B → Mode C: Take the constant current of the power input port of the rectifier module as the control target, gradually increase the discharge power of the energy storage unit, start the DC heavy load, stop the AC heavy load, and gradually reduce the power supplied by the inverter module to the AC power port;

Mode B → Mode D: Set the working mode of the energy storage unit to off-grid, exit the commutation module, and exit the rectifier module;

Mode C → Mode A: Take the constant input current of the power interface end of the rectifier module as the control target, switch the working mode of the energy storage unit to charging, and stop the DC heavy load;

Mode C → Mode B: Take the constant current of the power input port of the rectifier module as the control target, gradually increase the power supplied by the inverter module to the AC power port, start the AC heavy load, stop the DC heavy load, and gradually reduce the discharge power of the energy storage unit;

Mode C → Mode D: Set the working mode of the energy storage unit to off-grid, start the inverter module to supply power to the AC power port, exit the commutation module, and exit the rectifier module;

Mode D → Mode A: Start the rectifier module, start the commutation module, exit the inverter module, and set the working mode of the energy storage unit to grid-connected charging;

Mode D → Mode B: Start the rectifier module, start the commutation module, and set the working mode of the energy storage unit to grid-connected discharge;

Mode D → Mode C: Start the rectifier module, start the commutation module, exit the inverter module, and set the working mode of the energy storage unit to grid-connected discharge.

The instructions include binary instructions and continuous instructions. The binary instructions control the start and stop of each module in the electric energy conversion unit, and the continuous instructions are used to adjust the grid-connected, off-grid, charging, discharging mode and operating power of the electric energy storage unit. The binary instructions are executed in sequence according to the switching process between modes, and the decision basis of the continuous instructions is to keep the current of the power input port constant by adjusting the active power and reactive power of the electric energy storage unit.

The continuous instruction is based on:

Where X includes active power and reactive power (abbreviated as: power), _X0 is the power input by the rectifier module, _X1 is the power consumed by the AC load, _X2 is the power consumed by the DC load, _X3 is the power lost by the system, and δX is the power to be consumed by the variable load. When X is positive, the energy storage unit is in discharge mode, and when it is negative, it is in charging mode.

The beneficial effects of the present invention are as follows: through the electric energy storage and conversion technology, the key input signal required for the non-intrusive monitoring device - the working current of the user's actual load - is shielded, so that the load identification function of the non-intrusive monitoring device is invalidated, thereby protecting the user's privacy and playing a role in actively preventing the leakage of the user's privacy.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1. Block diagram of the user privacy active defense power conversion system.

Figure 2 shows the system's operating mode A - energy storage charging.

Figure 3 shows the system's operating mode B - AC heavy load.

Figure 4 shows the system's operating mode C - DC heavy load.

FIG5 shows the system's operating mode D—the system is off-grid.

in,

List of reference numerals:

Among them, 1-central control unit; 2-electric energy storage unit; 3-rectifier module, 4-inverter module, 5-voltage regulation module; 6-commutation module; 7-power input port; 8-AC power supply port; 9-DC power supply port.

DETAILED DESCRIPTION

The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

As shown in FIG. 1 , FIG. 1 is a block diagram of a user privacy active defense type power conversion system.

The user privacy active defense type power conversion system of this embodiment includes a central control unit (1), a power storage unit (2), a power conversion unit and an interface unit, wherein S1 is a DC energy channel, S2 is an AC energy channel, and S3 is a control signal channel. The interface unit provides a power input and a power equipment access port, and is connected to the power conversion unit to form an energy channel. The central control unit 1 uniformly dispatches the power conversion unit and the power storage unit to maintain the voltage and current of the power input port; the interface unit is divided into a power input port 7 and a power equipment power supply port, and the power supply port includes an AC power supply port 8 and a DC power supply port 9; wherein the power input port is externally connected to the output port of the user's electric meter, the AC power supply port and the DC power supply port are externally used for the AC load and DC load access of the user side respectively, and the interface unit is internally connected to the power conversion unit.

The power conversion unit includes a rectifier module 3, an inverter module 4, a voltage regulator module 5 and a commutation module 6. The input port of the interface unit is connected to the rectifier module to provide energy source for the system; the AC power port is connected to the parallel output end of the inverter module and the commutation module to supply power to the AC load; the DC power port is connected to the voltage regulator module to supply power to the DC load.

The DC side of the rectifier module, inverter module and voltage regulator module are connected in parallel with the central control unit and the power storage unit to use a DC bus. The DC bus provides an uninterrupted power supply to the central control unit to ensure the normal operation of the central control unit and the voltage regulator module. The central control unit and the voltage regulator module act as DC loads at any time. The power storage unit and other power conversion units connected in parallel have 4 working modes, and can switch between any two working modes.

Before switching modes, the user needs to select the load to be put into or out (referred to as: variable load) in the central control unit. There is communication between the power conversion unit and the central control unit, and the switching instructions between working modes are determined by the central control unit according to the power of the variable load.

Figure 2 shows the system's operating mode A - energy storage charging.

The rectifier module 3 serves as the only power source, supplies power to the AC power port 8 through the converter module 6, charges the energy storage unit 2 through the DC bus, supplies power to the DC power port 9 and the central control unit 1, and the inverter module 4 is not started (shaded, the same below);

Figure 3 shows the system's operating mode B - AC heavy load.

The rectifier module 3 and the energy storage unit 2 are used together as power sources. The rectifier module 3 supplies power to the AC power port 8 through the converter module 6. The energy storage unit 2 supplies additional power to the AC power port through the DC bus and the inverter module 4, and supplies power to the DC power port 9 and the central control unit 1 through the DC bus;

Figure 4 shows the system's operating mode C - DC heavy load.

The rectifier module 3 and the energy storage unit 2 are used together as power sources. The rectifier module supplies power to the AC power port through the converter module. The energy storage unit and the rectifier module supply power to the DC load through the DC bus. The inverter module 4 is not started.

FIG5 shows the system's operating mode D—the system is off-grid.

The rectifier module 3 and the converter module 6 stop running, and the energy storage unit 2 serves as the only power source to supply power to the rectifier module 4 and the voltage regulator module 5 through the DC bus.

The following are examples of working mode switching:

For ease of understanding, the following agreement is made in this embodiment: before the working mode is switched, the active power and reactive power output by the energy storage unit in the current working mode α are set to Pα and Qα, and the active power and reactive power output after switching to the working mode β are set to Pβ and Qβ.

The output power of Pα and Qα is set to the positive direction. If the energy storage unit is charging, the value takes a negative sign. The active power and reactive power of the variable load (connected or removed) are δP and δQ. The power consumption of the variable load is set to the positive direction. The signs of δP and δQ are positive when the load is connected, and negative when the load is removed. δP and δQ are stored in the load library of the central control unit.

Mode A → Mode B:

The central control unit 1 confirms δP and δQ, sends a working mode switching (charging→discharging) and power value (Pβ＝Pα+δP, Qβ＝Qα+δQ) instruction to the energy storage unit 2, and sends a start output instruction to the inverter module 4 to start the AC heavy load.

Mode A → Mode C:

The central control unit 1 confirms δP and δQ, and sends a working mode switching (charging→discharging) and power value (Pβ＝Pα+δP, Qβ＝Qα+δQ) instruction to the energy storage unit 2 to start the DC heavy load.

Mode A → Mode D:

The central control unit 1 confirms δP and δQ, sends a working mode switch (charging→discharging, grid-connected→off-grid) to the energy storage unit 2, sends a start instruction to the inverter module 4, sends an exit instruction to the commutation module 6, and sends an exit instruction to the rectifier module 3.

Mode B → Mode A:

The central control unit 1 confirms δP and δQ, and sends a working mode switching (discharging→charging) and power value (Pβ＝Pα+δP, Qβ＝Qα+δQ) instruction to the energy storage unit 2, stops the AC heavy load, and sends an exit instruction to the inverter module 4.

Mode B → Mode C:

The central control unit 1 confirms δP and δQ, and sends a power value (Pβ=Pα+δP, Qβ=Qα+δQ) instruction to the energy storage unit 2, starts the DC heavy load, stops the AC heavy load, and sends an exit instruction to the inverter module 4.

Mode B → Mode D:

The central control unit 1 confirms δP and δQ, sends a working mode switch (grid-connected→off-grid) to the electric energy storage unit 2, sends an exit instruction to the commutation module 6, and sends an exit instruction to the rectifier module 3.

Mode C → Mode A:

The central control unit 1 confirms δP and δQ, and sends a working mode switching (discharging→charging) and power value (Pβ＝Pα+δP, Qβ＝Qα+δQ) instruction to the energy storage unit 2 to stop the DC heavy load.

Mode C → Mode B:

The central control unit 1 confirms δP and δQ, and sends a power value (Pβ=Pα+δP, Qβ=Qα+δQ) instruction to the electric energy storage unit 2 to start the AC heavy load and stop the DC heavy load.

Mode C → Mode D:

The central control unit 1 confirms δP and δQ, sends a working mode switch (grid-connected→off-grid) to the energy storage unit 2, sends a start instruction to the inverter module 4, sends an exit instruction to the commutation module 6, and sends an exit instruction to the rectifier module 3.

Mode D → Mode A:

The central control unit 1 confirms δP and δQ, sends a start instruction to the rectifier module 3, sends a start instruction to the commutation module 6, sends an exit instruction to the inverter module 4, and sends a working mode switch (off-grid → grid-connected, discharge → charge) and power value to the energy storage unit 2.

(Pβ=Pα+δP, Qβ=Qα+δQ) instruction.

Mode D → Mode B:

The central control unit 1 confirms δP and δQ, sends a start instruction to the rectifier module 3, sends a start instruction to the commutation module 6, and sends a working mode switching (off-grid → grid-connected) and power value (Pβ＝Pα+δP, Qβ＝Qα+δQ) instruction to the energy storage unit 2.

Mode D → Mode C:

The central control unit 1 confirms δP and δQ, sends a start instruction to the rectifier module 3, sends a start instruction to the commutation module 6, sends an exit instruction to the inverter module 4, and sends a working mode switching (off-grid→grid-connected) and power value (P _β =P _α +δP, Q _β =Q _α +δQ) instruction to the energy storage unit 2.

The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims (1)

1. A user privacy active defense type power conversion system, characterized in that it comprises a central control unit (1), a power storage unit (2), a power conversion unit and an interface unit; the interface unit is divided into a power input port (7) and a power supply port for electric equipment, the power supply port comprising an AC power supply port (8) and a DC power supply port (9); the power conversion unit comprises a rectifier module (3), an inverter module (4), a voltage regulator module (5) and a commutation module (6); the power input port (7) of the interface unit is connected to the rectifier module (3) and is externally connected to an output port of a user's electric meter; the AC power supply port (8) is connected to the parallel output end of the inverter module (4) and the commutation module (6) to supply power to the AC load; the DC power supply port (9) is connected to the voltage regulator module to supply power to the DC load; the central control unit (1) uniformly dispatches the power conversion unit and the power storage unit to maintain the voltage and current of the power input port; The AC power port (8) and the DC power port (9) are used for connecting the AC load and the DC load on the user side respectively; the DC side of the rectifier module, the inverter module and the voltage regulator module are connected in parallel with the central control unit and the electric energy storage unit to a DC bus; the DC bus provides an uninterrupted power supply to the central control unit to ensure the normal operation of the central control unit and the voltage regulator module; the electric energy storage unit (2) and other electric energy conversion units connected in parallel therewith have four working modes, and any two working modes can be switched; before switching the mode, the user needs to select the load to be put into or out in the central control unit, which is called a variable load; there is communication between the electric energy conversion unit and the central control unit, and the switching instruction between the working modes is determined by the central control unit according to the power of the variable load; the central control unit stores all the user's load information with active power and reactive power as attributes, and the variable load is one of the loads stored in the central control unit; the four working modes are: (1) Mode A: Energy storage charging: The rectifier module is the only power source, supplying power to the AC power port through the converter module, charging the energy storage unit through the DC bus, and supplying power to the DC load; (2) Mode B: AC heavy load: The rectifier module and the energy storage unit are used together as the power source. The rectifier module supplies power to the AC power port through the converter module; the energy storage unit supplements the power supply to the inverter module through the DC bus to supply power to the DC load. (3) Mode C: DC heavy load: The rectifier module and the energy storage unit are used together as the power source. The rectifier module supplies power to the AC power port through the converter module; the energy storage unit and the rectifier module supply power to the DC load through the DC bus. (4) Mode D: System off-grid: The rectifier module and converter module are out of operation, and the energy storage unit serves as the only power source, supplying power to the rectifier module and DC load through the DC bus; The working mode switching method is: Mode A → Mode B: Take the constant current of the power input port of the rectifier module as the control target, switch the working mode of the energy storage unit to discharge, start the inverter module to supply power to the AC power port, and start the AC heavy load; Mode A → Mode C: Take the constant current of the power input port of the rectifier module as the control target, switch the working mode of the energy storage unit to discharge, and start the DC heavy load; Mode A → Mode D: Switch the working mode of the energy storage unit to discharge, set the working mode of the energy storage unit to off-grid, start the inverter module to supply power to the AC power port, exit the commutation module, and exit the rectifier module; Mode B → Mode A: The control target is to keep the current of the power input port of the rectifier module constant, switch the working mode of the energy storage unit to charging, stop the AC heavy load, and the inverter module stops supplying power to the AC power port; Mode B → Mode C: Take the constant current of the power input port of the rectifier module as the control target, gradually increase the discharge power of the energy storage unit, start the DC heavy load, stop the AC heavy load, and gradually reduce the power supplied by the inverter module to the AC power port; Mode B → Mode D: Set the working mode of the energy storage unit to off-grid, exit the commutation module, and exit the rectifier module; Mode C → Mode A: Take the constant input current of the power interface end of the rectifier module as the control target, switch the working mode of the energy storage unit to charging, and stop the DC heavy load; Mode C → Mode B: Take the constant current of the power input port of the rectifier module as the control target, gradually increase the power supplied by the inverter module to the AC power port, start the AC heavy load, stop the DC heavy load, and gradually reduce the discharge power of the energy storage unit; Mode C → Mode D: Set the working mode of the energy storage unit to off-grid, start the inverter module to supply power to the AC power port, exit the commutation module, and exit the rectifier module; Mode D → Mode A: Start the rectifier module, start the commutation module, exit the inverter module, and set the working mode of the energy storage unit to grid-connected charging; Mode D → Mode B: Start the rectifier module, start the commutation module, and set the working mode of the energy storage unit to grid-connected discharge; Mode D→Mode C: start the rectifier module, start the commutation module, exit the inverter module, and set the working mode of the energy storage unit to grid-connected discharge; the instructions include binary instructions and continuous instructions, the binary instructions control the start and stop of each module in the energy conversion unit, and the continuous instructions are used to adjust the grid-connected, off-grid, charging, discharging mode and operating power of the energy storage unit; the binary instructions are executed in sequence according to the switching process between modes, and the decision basis of the continuous instructions is to keep the current of the power input port constant by adjusting the active power and reactive power of the energy storage unit; The continuous instruction is based on:

; in

Including active power and reactive power, referred to as power,

is the power input to the rectifier module,

is the power consumed by the AC load,

is the power consumed by the DC load,

is the power loss in the system,

is the power that the variable load will consume; when

When it is positive, the energy storage unit is in discharge mode, and when it is negative, it is in charge mode.

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