一种光伏并网监控融合装置
By designing a photovoltaic grid-connected monitoring and integration device, and utilizing automatic circuit breaking and closing circuits and management chips, fast and safe circuit breaking and closing control is achieved. This solves the problems of structural redundancy in existing devices and the malfunction of protection devices and islanding effects caused by photovoltaic grid-connected energized closing, thereby improving the stability and safety of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WILLFAR INFORMATION TECH CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-17
AI Technical Summary
Existing photovoltaic grid-connected monitoring devices have redundant structures and are difficult to switch on and off quickly, safely and reliably. This leads to problems such as malfunctions of protection devices, islanding effects and damage to electrical equipment caused by switching on the photovoltaic grid while it is energized.
Design a photovoltaic grid-connected monitoring and integration device, including an intelligent module, an electrical operation module and a micro circuit breaker body. Through an automatic opening and closing circuit, hardware circuits and management chips are used to achieve fast and safe opening and closing control, combined with an overcurrent protection circuit to prevent abnormal conditions.
It achieves fast (ms-level) reliable and safe grid connection for photovoltaic grid connection, preventing energized closing at the outgoing terminal, and fast (ms-level) reliable disconnection from the grid after power failure, preventing islanded operation, thus improving the stability and safety of the system.
Smart Images
Figure CN224520760U_ABST
Abstract
Claims
1. A photovoltaic grid-tie monitoring fusion device, comprising: include: The intelligent module, the electrical operation module, and the micro circuit breaker are connected in sequence. The intelligent module includes a management core and an automatic opening and closing circuit; the management core is connected to the automatic opening and closing circuit; the automatic opening and closing circuit includes an operating mechanism drive circuit, a left zone detection and control circuit, a right zone detection and control circuit, and an overcurrent protection circuit; the left zone detection and control circuit is connected to the operating mechanism drive circuit and the overcurrent protection circuit, respectively, and the operating mechanism drive circuit is connected to the overcurrent protection circuit and the right zone detection and control circuit, respectively.
2. The photovoltaic grid-connected monitoring fusion device according to claim 1, characterized in that, The left-zone detection and control circuit includes diode D3, resistor R8, diode D4, diode D5, capacitor C2, resistor R9, resistor R10, transistor Q1, resistor R4, diode D2, diode V5, resistor R14, diode D8, single-pole double-throw switch U4, resistor R20, diode D10, resistor R11, resistor R15, comparator U5, diode D11, diode D14, resistor R16, and MOSFET V7; The drain of MOSFET V7 is connected to the operating mechanism drive circuit and the overcurrent protection circuit, respectively. The source of MOSFET V7 is grounded. The gate of MOSFET V7 is connected to the anode of diode D11, the anode of diode D14, and resistor R16, respectively. The cathode of diode D14 is connected to the management chip. The cathode of diode D11 is connected to pin 1 of comparator U5. Pin 3 of comparator U5 is connected to resistors R11 and R15, respectively. The other end of resistor R15 is connected to pin 5 of comparator U5. Pin 4 of comparator U5 is connected to resistor R21, the anode of diode D10, the anode of diode D8, and the anode of diode D2, respectively. The cathode of diode D10 is connected to resistor R20 and single-pole double-throw switch U4, respectively. The cathode of diode D2 is connected to the anode of diode V5 and resistor R14, respectively. The cathode of diode V5 is connected to the operating mechanism drive circuit. The cathode of diode D2 is connected to resistor R4 and collector of transistor Q1, respectively. The base of transistor Q1 is connected to resistors R9 and R10, respectively. The other end of resistor R9 is connected to capacitor C2, diode D4 and resistor R8, respectively. The other end of resistor R8 is connected to the cathode of diode D3. The emitter of transistor Q1 is connected to resistor R10, capacitor C2, the other end of diode D4, the anode of diode D5 and ground, respectively. Pin 2 of comparator U5, resistor R11, and resistor R14 are grounded. The other ends of resistors R16, R15, R21, R20, and R4 are connected to the power supply.
3. A photovoltaic grid-connected monitoring fusion device according to any of claims 1-2, characterized in that, The operating mechanism drive circuit includes diode D1, capacitor EC1, resistor R3, resistor R6, MOSFET V1, circuit breaker opening / closing operating mechanism J1, MOSFET V3, MOSFET V2, MOSFET V4, resistor R5, and resistor R7. The anode of diode D1 is connected to the power supply terminal and the left-zone detection and control circuit. The cathode of diode D1 is connected to capacitor EC1, resistor R3, the source of MOSFET V1, the source of MOSFET V2, and resistor R5. The other end of resistor R3 is connected to resistor R6 and the gate of MOSFET V1. The drain of MOSFET V1 is connected to the gate of circuit breaker opening / closing operating mechanism J1. The pins of the circuit breaker are connected to the drain of MOSFET V3. The gate of MOSFET V3 is connected to the other end of resistor R6, the left-region detection and control circuit, and the overcurrent protection circuit. The source of MOSFET V3 is connected to the overcurrent protection circuit. Pins 2 of the circuit breaker operating mechanism J1 are connected to the drains of MOSFET V2 and MOSFET V4, respectively. The source of MOSFET V4 is connected to the overcurrent protection circuit. The gate of MOSFET V2 is connected to the other end of resistor R5 and resistor R7, respectively. The other end of resistor R7 is connected to the gate of MOSFET V4 and the right-region detection and control circuit, respectively. The other end of capacitor EC1 is grounded.
4. A photovoltaic grid-connected monitoring fusion device according to any one of claims 1-2, characterized in that, The overcurrent protection circuit includes a comparator U6, a diode D6, resistors R22, R23, R19, R50, a capacitor C7, and a diode D7. Pin 1 of the comparator U6 is connected to resistor R50, capacitor C7, the cathodes of diode D6 and D7, respectively. The anode of diode D7 is connected to the operating mechanism drive circuit and the right-zone detection and control circuit, respectively. The anode of diode D6 is connected to the operating mechanism drive circuit and the left-zone detection and control circuit, respectively. Pin 2 of the comparator U6 is connected to ground and the other end of capacitor C7, respectively. Pin 5 of the comparator U6 is connected to the power supply terminal, the other ends of resistors R19 and R50, respectively. The other end of resistor R19 is connected to pin 3 of the comparator U6 and resistor R23, respectively. Pin 4 of the comparator U6 is connected to the operating mechanism drive circuit and resistor R22, respectively. The other ends of resistors R22 and R23 are grounded.
5. A photovoltaic grid-connected monitoring fusion device according to any one of claims 1-2, characterized in that, The right-zone detection and control circuit includes a MOSFET V8, resistor R17, diode D12, diode D15, comparator U7, resistor R18, resistor R12, diode D9, diode D13, resistor R13, resistor R24, diode V6, and a single-pole double-throw switch U8. The drain of the MOSFET V8 is connected to the operating mechanism drive circuit and the overcurrent protection circuit. The gate of the MOSFET V8 is connected to resistor R17, the anode of diode D12, and the anode of diode D15. The cathode of diode D15 is connected to the management chip. The cathode of diode D12 is connected to pin 1 of comparator U7. Pin 3 of comparator U7 is... Do not connect the cathodes of diodes D13 and D9. The anode of diode D13 is connected to resistor R24 and single-pole double-throw switch U8, respectively. The anode of diode D9 is connected to resistor R13 and the anode of diode V6, respectively. The cathode of diode V6 is connected to the operating mechanism drive circuit. Pin 4 of comparator U7 is connected to resistors R18 and R12, respectively. The other end of resistor R1 is connected to the power supply terminal and pin 5 of comparator U7, respectively. The other ends of resistors R17 and R24 are connected to the power supply terminal. The source of MOSFET V8, pin 2 of comparator U7, and the other ends of resistors R13 and R12 are grounded.
6. A photovoltaic grid-tie monitoring fusion device according to any of claims 1-2, wherein, The intelligent module is rigidly connected to the electrical operation module via a connector.
7. A photovoltaic grid-tie monitoring fusion device according to claim 6, wherein, The electrical operation module is equipped with a transfer seat that connects to the intelligent module.
8. A photovoltaic grid-tie monitoring fusion device according to any of claims 1-2, wherein, The electrical operation module is softly connected to the micro-break body via a wire.
9. A photovoltaic grid-tie monitoring fusion device according to claim 8, wherein, The micro-circuit body is equipped with a three-phase current transformer, a leakage current transformer, and a temperature sensor; the three-phase current transformer, the leakage current transformer, and the temperature sensor are all connected to the intelligent module and the electrical operation module.