Three-electricity control power distribution system

Abstract

The utility model provides a three-power control power distribution system, which comprises a first dual-power switching unit, a second dual-power switching unit and an outgoing line unit. Under the normal condition of the wind-solar power generation and energy storage power supply, the wind-solar power generation and energy storage power supply serves as conventional power, and the mains supply and the emergency power supply serve as standby power; under the condition that the wind-solar power generation energy storage power supply cannot provide electric energy required by the load, the load power supply is provided by the commercial power supply through the first dual-power switching unit and the second dual-power switching unit; furthermore, if the commercial power supply cannot provide power, the emergency power supply provides load power supply through the second dual-power-supply switching unit. The three-electricity control power distribution system provided by the utility model not only greatly improves the power supply reliability of a power distribution system of a load end based on a wind-solar power generation and energy storage power supply, but also can fully utilize the economical efficiency of wind-solar power generation and energy storage.

Description

Technical Field

[0001] The utility model belongs to the technical field of power distribution, and relates to a three-electricity control distribution system, in particular to a three-electricity control distribution system based on a wind and solar power generation energy storage power supply, a city power supply and an emergency power supply. Background Art

[0002] With the vigorous development of the new energy power generation industry, mainly wind power generation and photovoltaic power generation, it has not only driven economic growth and promoted energy transformation, but also played a huge role in reducing greenhouse gas emissions and reducing air pollution while providing clean electricity; however, wind power generation and photovoltaic power generation have the characteristics of randomness and volatility, which not only affects the safe and stable operation of the original power system, but also significantly affects the economy of the power system operation.

[0003] In order to cope with the randomness and volatility of wind power generation and photovoltaic power generation, although energy storage systems based on lithium batteries are vigorously built at the end of electricity consumption (i.e., the load end); however, lithium batteries are prone to fire, and once a fire occurs, it is difficult to extinguish the fire, especially since the inverter generally has a lifespan of about 10 years. Once it fails, the load end will switch to the unreliable AC power supply. If there are important loads that cannot be shut down, such as data centers, fish tanks, wine cellars, etc., the power supply reliability of the distribution system based on wind and solar power generation and energy storage power supply will be greatly reduced. Summary of the invention

[0004] In order to solve the above problems, the utility model provides a three-electricity control distribution system based on wind and solar power generation energy storage power supply, municipal power supply and emergency power supply, which can not only provide reliable power supply to the load end, but also make full use of the economy of wind and solar power generation energy storage.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a three-electric control distribution system including a first dual power switching unit, a second dual power switching unit and an outlet unit thereof; the first dual power switching unit includes a first dual power incoming line circuit, a first dual power conversion switch and a first outlet terminal thereof, the first dual power incoming line circuits are respectively a photovoltaic energy storage power incoming line circuit and a mains power incoming line circuit, the photovoltaic energy storage power incoming line circuit includes a photovoltaic energy storage power supply, a photovoltaic energy storage power supply circuit breaker and a photovoltaic energy storage power supply incoming line connection line, the mains power supply incoming line circuit includes a mains power supply, a mains power supply circuit breaker and a mains power supply incoming line connection line; the second dual power switching unit includes a second dual power incoming line circuit, a second dual power conversion switch and a second outlet terminal thereof, the second dual power incoming line circuits are respectively a second incoming line circuit and a mains power supply circuit breaker. The emergency power supply incoming line circuit, the second incoming line circuit is a second incoming line connection line directly connected to the first outlet terminal, the emergency power supply incoming line circuit includes an emergency power supply, an emergency power supply circuit breaker and its emergency power supply incoming line connection line; the outlet unit includes an outgoing line incoming line circuit and an outgoing line outgoing line circuit connected thereto, the outgoing line incoming line circuit includes an electric meter connected in sequence to the second outlet terminal and an outgoing line incoming line connection line of the outgoing line circuit breaker, the outgoing line outgoing line circuit includes a UPS power supply unit and a plurality of load units respectively distributed in parallel, the UPS power supply unit includes a UPS incoming line circuit breaker, a UPS uninterruptible power supply A, a switching power supply and a communication control management machine, the communication control management machine is connected to the output end of the switching power supply, the load unit includes a load circuit breaker and a load, and the three-electricity control distribution system is a low-voltage distribution system.

[0006] Preferably, the first dual power transfer switch and the second dual power transfer switch are ATS automatic transfer switches or STS static transfer switches.

[0007] Preferably, the photovoltaic energy storage power supply circuit breaker and / or the mains power supply circuit breaker and / or the emergency power supply circuit breaker are automatic reclosing circuit breakers.

[0008] Preferably, the low voltage power distribution system is an AC220V or AC380V voltage level distribution system.

[0009] Preferably, the outgoing line circuit further includes a surge protection unit, and the surge protection unit includes a surge protection circuit breaker and a surge protector, wherein the surge protector is grounded to the three-electricity control distribution system.

[0010] Preferably, the UPS power supply unit also includes a 4G display screen, and the 4G display screen and the communication control management machine are connected in parallel to the output end of the switching power supply.

[0011] Preferably, the photovoltaic energy storage power supply is replaced by a wind power generation energy storage power supply or a wind-solar power generation energy storage power supply.

[0012] Preferably, the emergency power supply is a generator set or a UPS uninterruptible power supply B or an EPS emergency power supply or another mains power supply independent of the mains power supply in the three-electricity control distribution system.

[0013] The utility model provides a three-electricity control distribution system including a first dual power switching unit, a second dual power switching unit and an outlet unit thereof. When the wind-solar power generation and energy storage power supply is normal, the wind-solar power generation and energy storage power supply is used as conventional power, and the mains power supply and the emergency power supply are used as backup power. When the wind-solar power generation and energy storage power supply cannot provide the electric energy required by the load, the mains power supply is used to provide the load power supply through the first dual power switching unit and the second dual power switching unit; when the wind-solar power generation and energy storage power supply cannot provide the electric energy required by the load, and the mains power supply cannot provide power at the same time, the emergency power supply is used to provide the load power supply through the second dual power switching unit; and when the three-electricity control distribution system detects that the wind-solar power generation and energy storage power supply or the mains power supply is normal, the emergency power supply load power supply is stopped, the first dual power switching unit automatically switches to the photovoltaic energy storage power supply or the mains power supply, and the second dual power switching unit automatically switches to the second incoming line circuit load power supply. Therefore, the three-electricity control distribution system provided by the present invention not only greatly improves the power supply reliability of the distribution system at the load end based on the wind-solar power generation and energy storage power supply, but also can make full use of the economy of wind-solar power generation and energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure principle of the three-electric control power distribution system provided by the utility model;

[0015] Figure 2 for Figure 1 The schematic diagram of the electrical wiring principle structure of the three-electric control distribution system is shown in;

[0016] Figure 3 for Figure 1 The schematic diagram of the secondary electrical wiring principle structure of the UPS power supply unit is shown in the figure. DETAILED DESCRIPTION

[0017] The following is a detailed description of a three-electricity control distribution system provided by the present invention, taking an AC220V voltage level low-voltage distribution system as an example, in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 1 and 2As shown, the three-electric control distribution system includes a first dual power switching unit, a second dual power switching unit and an outlet unit thereof; the first dual power switching unit includes a first dual power incoming line circuit, a first dual power conversion switch S4 and a first outlet terminal thereof, the first dual power incoming line circuits are respectively a photovoltaic energy storage power incoming line circuit and a mains power incoming line circuit, the photovoltaic energy storage power incoming line circuit includes a photovoltaic energy storage power supply, an automatic reclosing circuit breaker S1 and a photovoltaic energy storage power incoming line connection line thereof, the mains power incoming line circuit includes a mains power supply, an automatic reclosing circuit breaker S2 and a mains power incoming line connection line thereof; the second dual power switching unit includes a second dual power incoming line circuit, a second dual power conversion switch S5 and a second outlet terminal thereof, the The second dual power supply incoming line circuits are respectively a second incoming line circuit and an emergency power supply incoming line circuit, the second incoming line circuit is a second incoming line connection line directly connected to the first outlet terminal, the emergency power supply incoming line circuit includes an emergency power supply (generator set power supply), an automatic reclosing circuit breaker S3 and its emergency power supply incoming line connection line; the outlet unit includes an outgoing line incoming line circuit and an outgoing line outgoing line circuit connected thereto, the outgoing line incoming line circuit includes an outgoing line incoming line connection line of an electric meter PW1 and an outgoing line circuit breaker S6 connected in sequence to the second outlet terminal, the outgoing line outgoing line circuit includes a UPS power supply unit, a plurality of load units and a surge protection unit respectively distributed in parallel, the UPS power supply unit includes a UPS incoming line circuit breaker S7, a UPS uninterruptible power supply A S10, switching power supply V1, 4G display screen and communication control management machine S12, the 4G display screen S11 and the communication control management machine S12 are connected in parallel at the output end of the switching power supply V1, the load unit includes a load circuit breaker S8 and a load, and the surge protection unit includes a surge protection circuit breaker S9 and a surge protector SK1.

[0019] The automatic reclosing circuit breaker (S1 / S2 / S3) detects and judges the voltage on the power supply side; when the voltage on the power supply side is overvoltage, undervoltage or voltage loss, it automatically delays opening, and automatically closes when the voltage on the power supply side returns to normal. At the same time, it has short-circuit protection, overload protection and isolation functions for its outgoing lines, such as CDBNE125GQF series photovoltaic grid-connected circuit breakers.

[0020] The first and second dual power conversion switches are both ATS (Automatic transfer switching equipment) automatic conversion switches, such as YRQ1PC-125 automatic conversion switch. When the ATS automatic conversion switch is working, the internal controller of the ATS automatic conversion switch continuously samples the voltage and current of the dual power supplies in real time, and calculates the effective value of each voltage and current. According to the preset voltage and current values, the internal controller makes corresponding judgments and sends an opening or closing command to its operating mechanism through its timing drive circuit, so as to realize the switching between the dual power supplies of the ATS automatic conversion switch.

[0021] like Figure 3 As shown, the communication control management machine S12 is a relay control device using the standard Modbos-RTU protocol, supporting RS485 / 232 or network communication. It supports wide voltage power supply, has a multi-channel input and output control unit, and can be widely used in various application scenarios such as industrial production, agriculture, smart cities, office buildings, etc., such as LH-10808, 8DO+8DI isolated RS485+RS232.

[0022] The 4G display screen S11 is connected to the communication control management machine S12 via the RS485 / 232 interface, and is used to display the real-time power supply voltage, current, power consumption, IO status of each component, dual power conversion switch switching power supply or failure, alarm name, and fault phenomenon description of the three-electric control distribution system; the mobile phone APP also synchronously receives and displays the above signals through the 4G display screen, such as the McgsTpc N series embedded integrated touch screen.

[0023] The intermediate relay KA1 is a relay with a coil voltage of AC220V. The coil of the relay draws power from the incoming line of the photovoltaic energy storage power supply. When the photovoltaic energy storage power supply has power, the KA1 coil is energized, the normally open contact of the relay is closed, and the communication control management machine judges whether the energy storage has power through the DI input feedback of S12;

[0024] The intermediate relay KA2 is a relay with a coil voltage of AC220V. The coil of the relay draws power from the mains power supply. When the mains power supply has power, the KA2 coil is energized, the normally open contact of the relay is closed, and the communication control management machine judges whether the mains power has power through the DI input feedback of S12;

[0025] The intermediate relay KA3 is a relay with a coil voltage of AC220V. The coil of the relay draws power from the emergency power supply line. When the emergency power supply starts to generate electricity, the KA3 coil is energized, the normally open contact of the relay is closed, and the communication control management machine judges whether the generator has power through the DI input feedback of S12;

[0026] The intermediate relay KA8 is a relay with a coil voltage of DC24V. When the communication control management machine determines that both the mains power supply and the photovoltaic energy storage power supply are out of power through the feedback signals of KA1 and KA2, it will control the KA8 coil to be energized and send a start signal to the emergency power supply (such as the generator set power supply) through the normally open contact of KA8;

[0027] The intermediate relay KA9 is a relay with a coil voltage of DC24V. When the communication control management machine determines through the feedback signals of KA1 and KA2 that one of the AC power supply or the photovoltaic energy storage power supply has power, or both the AC power supply and the photovoltaic energy storage power supply have power, it will control the KA9 coil to be energized, and send a stop signal to the emergency power supply (such as the generator set power supply) through the normally open contact of KA9.

[0028] The UPS uninterruptible power supply A includes a rectifier, a battery, an inverter and a static switch; the switch power supply V1 is used to provide an uninterruptible power supply to the communication control management machine S12 and the 4G display screen S11. When the system output power is normal, the UPS uninterruptible power supply A stabilizes the system output power supply and supplies it to the communication control management machine S12 and the 4G display screen S11 for use. At this time, the UPS uninterruptible power supply A is relative to an AC voltage stabilizer and also charges its battery; when the system output power is interrupted (accidental power outage), the UPS uninterruptible power supply A uses the power of its battery to continue to provide working power to the communication control management machine S12 and the 4G display screen S11 through the inverter to maintain normal operation and protect its load software and hardware from damage; the UPS uninterruptible power supply A usually also has the function of providing protection against excessive voltage and too low voltage.

[0029] A surge protection unit is provided in the outgoing line circuit, wherein the surge protector is grounded to the three-electric control distribution system to protect the load electrical equipment from high transient overvoltage hazards.

[0030] Here’s how it works:

[0031] 1) Under normal circumstances (i.e. when the photovoltaic energy storage power supply operates normally and the output power of the photovoltaic energy storage power supply can meet the load requirements, such as when the equipment in the photovoltaic energy storage power supply operates normally and its output can meet the load requirements), the photovoltaic energy storage power supply is used as conventional power, and the mains power supply and emergency power supply are used as backup power;

[0032] 2) When the photovoltaic energy storage power supply cannot provide the electric energy required by the load (i.e., the photovoltaic energy storage power supply fails or the electric energy output by the photovoltaic energy storage power supply cannot meet the load requirements, such as abnormal operation of the equipment in the photovoltaic energy storage power supply, such as inverter failure, or its output does not meet the load requirements), the three-electricity control distribution system automatically switches to the mains power supply through the first dual power conversion switch S4 and continues to provide load power through the second incoming line circuit by the second dual power conversion switch S5; when the photovoltaic energy storage power supply can provide the electric energy required by the load (i.e., the photovoltaic energy storage power supply has no faults and the electric energy output by the photovoltaic energy storage power supply can meet the load requirements), the three-electricity control distribution system automatically switches back to the photovoltaic energy storage power supply through the first dual power conversion switch S4 and continues to provide load power through the second incoming line circuit by the second dual power conversion switch S5;

[0033] 3) When the photovoltaic energy storage power supply cannot provide the electric energy required by the load (i.e., the photovoltaic energy storage power supply fails or the electric energy output by the photovoltaic energy storage power supply cannot meet the load requirements, such as the equipment in the photovoltaic energy storage power supply is not operating normally, such as the inverter fails, or its output does not meet the load requirements), and the mains power supply cannot provide power, the three-electric control distribution system will automatically switch to the emergency power supply through the second dual power conversion switch S5 to provide load power, and at the same time, interlock the automatic reclosing circuit breaker S1 and the automatic reclosing circuit breaker S2, and do not allow any of the circuit breakers to close. When the three-electric control distribution system detects that the photovoltaic energy storage power supply or the mains power supply is normal, the interlock of the automatic reclosing circuit breaker S1 or the automatic reclosing circuit breaker S2 is released, and the emergency power supply is stopped at the same time. The first dual power conversion switch S4 automatically switches to the photovoltaic energy storage power supply or the mains power supply, and the second dual power conversion switch S5 switches to the second incoming line circuit load power supply.

[0034] The first and second dual power transfer switches described in the present invention may also be STS (Static Transfer Switch) static transfer switches.

[0035] The emergency power supply described in the present invention is a generator set or a UPS uninterruptible power supply B or an EPS emergency power supply or another mains power supply independent of the mains power supply in the three-electricity control power distribution system.

[0036] The automatic reclosing circuit breakers S1, S2, and S3 described in the present invention may be conventional circuit breakers without an automatic reclosing function, which will reduce the reliability of load power supply in the three-electricity control distribution system.

[0037] The three-electricity control distribution system of the present invention can also be used for AC380V and other low voltage level systems, and its corresponding automatic reclosing circuit breaker, dual power supply conversion switch, and outgoing and incoming line circuit breakers can select devices of corresponding voltage levels.

[0038] The photovoltaic energy storage power supply described in the present invention may also be a wind power generation energy storage power supply, a wind-solar power generation energy storage power supply, or other new energy power generation energy storage power supplies.

[0039] The inventive point of the utility model is: for a power distribution system at the load end mainly based on wind-solar power generation and energy storage power supplies, a first dual power supply switching unit, a second dual power supply switching unit and an output unit thereof are adopted, and when the wind-solar power generation and energy storage power supplies cannot provide the electric energy required by the load, the load is supplied with power by the mains power supply and the emergency power supply respectively; here, the claims describe the protection scope of the utility model, but any variation scheme that includes the inventive point of the utility model and does not deviate from the purpose of the invention shall fall within the protection scope of the utility model.

Claims

1. A three-electric control distribution system, characterized in that: It includes a first dual power switching unit, a second dual power switching unit and an outlet unit thereof; the first dual power switching unit includes a first dual power incoming line circuit, a first dual power conversion switch and a first outlet terminal thereof, the first dual power incoming line circuits are respectively a photovoltaic energy storage power incoming line circuit and a mains power incoming line circuit, the photovoltaic energy storage power incoming line circuit includes a photovoltaic energy storage power supply, a photovoltaic energy storage power supply circuit breaker and a photovoltaic energy storage power supply incoming line connection line, the mains power supply incoming line circuit includes a mains power supply, a mains power supply circuit breaker and a mains power supply incoming line connection line; the second dual power switching unit includes a second dual power incoming line circuit, a second dual power conversion switch and a second outlet terminal thereof, the second dual power incoming line circuits are respectively a second incoming line circuit and an emergency power supply incoming line circuit, the second incoming line circuit The line loop is a second incoming line connection line directly connected to the first outlet terminal, the emergency power supply incoming line loop includes an emergency power supply, an emergency power supply circuit breaker and its emergency power supply incoming line connection line; the outlet unit includes an outgoing line incoming line loop and an outgoing line outgoing line loop connected thereto, the outgoing line incoming line loop includes an electric meter connected in sequence to the second outlet terminal and an outgoing line incoming line connection line of the outgoing line circuit breaker, the outgoing line outgoing line loop includes a UPS power supply unit and a plurality of load units respectively distributed in parallel, the UPS power supply unit includes a UPS incoming line circuit breaker, a UPS uninterruptible power supply A, a switching power supply and a communication control management machine, the communication control management machine is connected to the output end of the switching power supply, the load unit includes a load circuit breaker and a load, and the three-electricity control distribution system is a low-voltage distribution system.

2. The three-electricity control and distribution system according to claim 1, characterized in that: The first dual power transfer switch and the second dual power transfer switch are ATS automatic transfer switches or STS static transfer switches.

3. The three-electricity control and distribution system according to claim 2 is characterized in that: The photovoltaic energy storage power supply circuit breaker and / or the mains power supply circuit breaker and / or the emergency power supply circuit breaker are automatic reclosing circuit breakers.

4. The three-electricity control and distribution system according to claim 3 is characterized in that: The low voltage power distribution system is an AC220V or AC380V voltage level power distribution system.

5. The three-electricity control and distribution system according to claim 1, 2, 3 or 4, characterized in that: The outgoing line circuit also includes a surge protection unit, which includes a surge protection circuit breaker and a surge protector, wherein the surge protector is grounded to the three-electricity control distribution system.

6. The three-electricity control and distribution system according to claim 5, characterized in that: The UPS power supply unit also includes a 4G display screen, and the 4G display screen and the communication control management machine are connected in parallel to the output end of the switching power supply.

7. The three-electricity control and distribution system according to claim 1 or 2 or 3 or 4 or 6, characterized in that: The photovoltaic energy storage power supply is replaced by a wind power generation energy storage power supply or a wind-solar power generation energy storage power supply.

8. The three-electricity control and distribution system according to claim 1 or 2 or 3 or 4 or 6, characterized in that: The emergency power supply is a generator set or a UPS uninterruptible power supply B or an EPS emergency power supply or another mains power supply independent of the mains power supply in the three-electricity control distribution system.

9. The three-electricity control and distribution system according to claim 5, characterized in that: The photovoltaic energy storage power supply is replaced by a wind power generation energy storage power supply or a wind-solar power generation energy storage power supply.

10. The three-electricity control and distribution system according to claim 5, characterized in that: The emergency power supply is a generator set or a UPS uninterruptible power supply B or an EPS emergency power supply or another mains power supply independent of the mains power supply in the three-electricity control distribution system.

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