Electricity-saving and energy-saving terminal electrical comprehensive treatment protection module
Through the central control module and enhanced active power filter module of the terminal electrical integrated management and protection module, the automatic balancing and safety protection of three-phase current is realized, which solves the problem of three-phase unbalanced current in the electrical management system, reduces power consumption and improves power factor.
Patent Information
- Application Number
- CN202520032150.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-01-07
AI Technical Summary
Existing electrical management systems cannot effectively balance three-phase unbalanced currents, resulting in high power consumption and low power factor. They also cannot provide protection against overcurrent in the neutral line, leading to a low safety factor.
An energy-saving terminal electrical comprehensive management and protection module is adopted, including a central control module, an enhanced active power filter module, and a bus capacitor module. By real-time detection of system-side current and voltage, the module controls the on/off switching of the three-phase circuit to achieve current balance. The enhanced active power filter module includes a sampling module and a compensation current generation circuit, which uses power transistors and inductors to achieve current conversion and balance.
It achieves automatic balancing of three-phase current, reduces power consumption, improves power factor, enhances safety and control accuracy, has a wide range of applications, and can respond quickly and achieve multi-load regulation.
Smart Images
Figure CN223884951U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrical connection technical field, concretely relates to a terminal electrical comprehensive management protection module of electricity -saving energy -saving. BACKGROUND
[0002] Zero line overcurrent can cause electrical circuit overload work, can seriously heat, even cause fire. There is no overcurrent protection device on the zero line, because the electrician specification does not allow installing protection device on the zero line. Therefore, zero line even in the case of excessive current, also will not appear protection, but is at the mercy of zero line heating. Once the zero line is damaged, the system failure caused by zero breakage is very serious, and the electrical equipment on the power grid is damaged. In the distribution system, the cross-sectional area of the zero line will not exceed the cross-sectional area of the phase line, and even less than the cross-sectional area of the phase line. Therefore, if the current on the zero line exceeds the phase current, it will overheat, and the current on the zero line exceeding the phase current will cause great security risks. At the same time, if the low-voltage power grid operates under the condition of large three-phase load imbalance, it will also increase the power consumption of the distribution transformer, and the power factor of the power grid is low, which is not conducive to the current energy-saving and power-saving demand. SUMMARY
[0003] The utility model wants to solve the technical problem: the existing electrical management system can not balance three-phase unbalanced current well, resulting in high power consumption of the existing electrical management system, low power factor of the power grid, and unable to protect the zero line when the zero line overcurrent, low safety factor.
[0004] To solve the above technical problems, the utility model adopts the following technical scheme: a terminal electrical comprehensive management protection module of electricity -saving energy -saving, including the central control module for data processing and carrying out the overall control of circuit, the enhanced active power filter module for adjusting three-phase imbalance, and the bus capacitor module for balancing each phase current through charging and discharging, the enhanced active power filter module includes the sampling module for real-time detection of system side voltage and current, and the compensation current generation circuit for controlling three-phase circuit on-off to absorb energy from the power grid and convert between three-phase circuits to make three-phase current reach balanced state, the sampling end of the sampling module is arranged on the three-phase circuit and neutral line between the power grid and the corresponding three-phase unbalanced load, the signal output end of the sampling module is connected with the central control module, the control output end of the central control module is connected with the control input end of the compensation current generation circuit, and the bus capacitor module is connected with the three-phase circuit and neutral line between the power grid and the corresponding three-phase unbalanced load through the compensation current generation circuit.
[0005] The utility model discloses a working time, can carry out the real -time detection of system side current, and control three -phase circuit break -make to absorb energy between three -phase circuit from power grid and make three -phase current reach balanced state etc. Series of work, automation and intelligent degree are high, thereby realize elimination harmonic lower power grid total harmonic distortion, compensate the reactive power and promote power factor, can reach two -way continuous regulation when adjusting the size of unbalanced current simultaneously, response speed is fast, and it is not easy to be influenced by power grid impedance, and can realize the separate and centralized regulation of multiple unbalanced load, and the universality is strong, and the scope of application is wide.
[0006] As preferred, the compensation current generating circuit is further provided with a fourth bridge arm, and a midpoint of the fourth bridge arm is connected with the neutral line through the bus capacitor module.
[0007] As preferred, the compensation current generating circuit comprises power transistors T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, inductors L1, L2, L4, L5, L7, L8, L N diodes D1, D2, D3, D4, D5, D6, D7 and D8, and the bus capacitor module is provided with bus capacitors C d1 and bus capacitors C d2 ;
[0008] The emitter of the power transistor T2 and the collector of the power transistor T3 are both connected with a first end of the inductor L2, a second end of the inductor L2 is connected with an A line in a three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L1, the collector of the power transistor T2 is connected with a cathode of the diode D1 and an emitter of the power transistor T1 respectively, the emitter of the power transistor T3 is connected with an anode of the diode D2 and a collector of the power transistor T4 respectively, the collector of the power transistor T1 is connected with the emitter of the power transistor T4 through bus capacitors C d1 and bus capacitors C d2 and the emitter of the power transistor T4;
[0009] The emitter of the power transistor T6 and the collector of the power transistor T7 are connected to the first end of the inductor L5, the second end of the inductor L5 is connected to the B line in the three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L4, the collector of the power transistor T6 is connected to the cathode of the diode D3 and the emitter of the power transistor T5 respectively, the emitter of the power transistor T7 is connected to the anode of the diode D4 and the collector of the power transistor T8 respectively, the collector of the power transistor T5 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T8;
[0010] The emitter of the power transistor T10 and the collector of the power transistor T11 are connected to the first end of the inductor L8, the second end of the inductor L8 is connected to the C line in the three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L7, the collector of the power transistor T10 is connected to the cathode of the diode D5 and the emitter of the power transistor T9 respectively, the emitter of the power transistor T11 is connected to the anode of the diode D6 and the collector of the power transistor T12 respectively, the collector of the power transistor T9 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T12;
[0011] The emitter of the power transistor T14 and the collector of the power transistor T15 are connected to the first end of the inductor L N , the second end of the inductor L N is connected to the neutral line, the collector of the power transistor T14 is connected to the cathode of the diode D7 and the emitter of the power transistor T13 respectively, the emitter of the power transistor T15 is connected to the anode of the diode D8 and the collector of the power transistor T16 respectively, the collector of the power transistor T13 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T16;
[0012] The gate of the power transistor T1, the gate of the power transistor T2, the gate of the power transistor T3, the gate of the power transistor T4, the gate of the power transistor T5, the gate of the power transistor T6, the gate of the power transistor T7, the gate of the power transistor T8, the gate of the power transistor T9, the gate of the power transistor T10, the gate of the power transistor T11, the gate of the power transistor T12, the gate of the power transistor T13, the gate of the power transistor T14, the gate of the power transistor T15 and the gate of the power transistor T16 are connected with the central control module respectively, and the anode of the diode D1, the cathode of the diode D2, the anode of the diode D3, the cathode of the diode D4, the anode of the diode D5, the cathode of the diode D6, the anode of the diode D7 and the cathode of the diode D8 are all connected.
[0013] During the working of the utility model, the on-off of the power transistor is controlled by the central control module to realize the balance of three-phase current, thereby stabilizing the voltage, reducing the power consumption, improving the power factor, realizing the energy-saving function, increasing the fourth bridge arm, connecting the midpoint of the fourth bridge arm with the neutral line through the bus capacitor module, realizing the control decoupling of the neutral line current and the three-phase current of the A line, the B line and the C line, increasing the control precision and the control ability of the unbalanced current, and further improving the energy-saving effect.
[0014] As preferred, a filter circuit for filtering high-order harmonics is further included, which comprises an inductor L3, an inductor L6, an inductor L9, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6, the second end of the inductor L2 is connected with the neutral line through the capacitor C1 and the inductor R1 and connected with the center line through the capacitor C2 and the inductor L3, the second end of the inductor L5 is connected with the neutral line through the capacitor C3 and the inductor R2 and connected with the center line through the capacitor C4 and the inductor L6, and the second end of the inductor L8 is connected with the neutral line through the capacitor C5 and the inductor R3 and connected with the center line through the capacitor C6 and the inductor L9.
[0015] As preferred, the resonance frequency of the capacitor C2 and the inductor L3 is set to be equal to the switching frequency of the power transistor T1, the power transistor T2, the power transistor T3 and the power transistor T4, the resonance frequency of the capacitor C4 and the inductor L6 is set to be equal to the switching frequency of the power transistor T5, the power transistor T6, the power transistor T7 and the power transistor T8, and the resonance frequency of the capacitor C3 and the inductor L9 is set to be equal to the switching frequency of the power transistor T9, the power transistor T10, the power transistor T11 and the power transistor T12.
[0016] As preferred, the AD signal detection module and the conditioning unit are further included, the AD signal detection module includes three-phase load current signal detection circuit, three-phase APF output current detection circuit, three-phase LC output current detection circuit, two-way DC side capacitor voltage detection circuit, IGBT temperature detection circuit and DC bus voltage detection circuit, the three-phase load current signal detection circuit, the three-phase APF output current detection circuit, the three-phase LC output current detection circuit, the two-way DC side capacitor voltage detection circuit, the IGBT temperature detection circuit and the DC bus voltage detection circuit are connected with the central control module through the conditioning unit respectively, and the detection end of the three-phase load current signal detection circuit, the detection end of the three-phase APF output current detection circuit, the detection end of the three-phase LC output current detection circuit, the detection end of the two-way DC side capacitor voltage detection circuit, the detection end of the IGBT temperature detection circuit and the detection end of the DC bus voltage detection circuit are connected with corresponding parts in the terminal electrical comprehensive treatment protection module respectively.
[0017] As preferred, the protection circuit for protecting the fault-free operation of the enhanced active power filter module is further included, the detection end of the protection circuit is connected with the bus capacitor module and the enhanced active power filter module respectively, and the protection circuit outputs a protection signal to the central control module to perform protection work to cut off the circuit when detecting that the bus capacitor module voltage is too high, the upper and lower capacitor difference is large, the output current is abnormal, the grid voltage is abnormal or the power device temperature is too high.
[0018] As preferred, the PWM isolation driving module is further included, the central control module is connected with the compensation current generation circuit through the PWM isolation driving module, and the PWM isolation driving module receives a control signal to output a PWM driving signal with driving capability to the compensation current generation circuit after the operation processing of the central control module is completed.
[0019] As preferred, the communication module for networking communication and the touch screen module for human-computer interaction are further included, and the communication module and the touch screen module are connected with the central control module,
[0020] As preferred, the communication module is provided with at least one of an RS485 communication circuit, an RS232 communication circuit and a CAN communication circuit.
[0021] The beneficial technical effects of the utility model include:
[0022] 1. The utility model discloses a series of work such as the real -time detection of system side current can be carried out, and control three -phase circuit on -off from the grid absorption energy mutual transformation between three -phase circuit to make three -phase current reach balanced state, and the automation and intelligent degree is high, thereby realize eliminating harmonic lower grid total harmonic distortion, compensate reactive power and improve power factor, can reach two -way continuous regulation when regulating the size of unbalanced current simultaneously, response speed is fast, and it is not easy to be influenced by grid impedance, and can realize the individual and centralized regulation of multiple unbalanced load, and the universality is strong, and the application scope is wide.
[0023] 2. The utility model discloses a series of work such as the real -time detection of system side current can be carried out, and control three -phase circuit on -off from the grid absorption energy mutual transformation between three -phase circuit to make three -phase current reach balanced state, and the automation and intelligent degree is high, thereby realize eliminating harmonic lower grid total harmonic distortion, compensate reactive power and improve power factor, can reach two -way continuous regulation when regulating the size of unbalanced current simultaneously, response speed is fast, and it is not easy to be influenced by grid impedance, and can realize the individual and centralized regulation of multiple unbalanced load, and the universality is strong, and the application scope is wide.
[0024] The other features and advantages of the utility model will be disclosed in the following specific embodiment, drawing in detail. BRIEF DESCRIPTION OF DRAWINGS
[0025] The utility model makes further explanation from the following combined with the drawing:
[0026] ATTACHMENT Figure 1 It is a kind of energy-saving terminal electrical comprehensive management protection module's structural diagram;
[0027] ATTACHMENT Figure 2 It is a kind of energy-saving terminal electrical comprehensive management protection module's partial circuit structure diagram. DETAILED DESCRIPTION
[0028] The technical scheme of the utility model embodiment is explained and described below in combination with the drawings of the utility model embodiment, but the following embodiment is only preferred embodiment of the utility model, not all.Based on the embodiment in embodiment, other embodiments obtained by the person skilled in the art without making creative work all belong to the protection scope of the utility model.
[0029] In the following description, the appearance of terms such as "in", "out", "up", "down", "left", "right" and the like indicates the orientation or positional relationship only for the convenience of describing the embodiment and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0030] Please refer to the attached Figure 1The embodiment discloses a terminal electrical comprehensive management and protection module for power saving and energy saving, which comprises a central control module 1 for data processing and overall control of a circuit, an enhanced active power filter module for regulating three-phase imbalance, and a bus capacitor module 3 for balancing each phase current through charging and discharging.
[0031] Please refer to the accompanying Figure 1 and the accompanying Figure 2 In the embodiment, the enhanced active power filter module comprises a sampling module 21 for real-time detection of system-side voltage and current, and a compensation current generating circuit 22 for controlling the on-off of a three-phase circuit to absorb energy from a power grid and convert the energy among the three-phase circuits to balance the three-phase current. The sampling end of the sampling module 21 is arranged on the three-phase circuit and the neutral line between the power grid and the corresponding three-phase imbalance load, the signal output end of the sampling module 21 is connected with the central control module 1, the control output end of the central control module 1 is connected with the control input end of the compensation current generating circuit 22, and the bus capacitor module 3 is connected with the three-phase circuit and the neutral line between the power grid and the corresponding three-phase imbalance load through the compensation current generating circuit 22.
[0032] In the working process of the embodiment, the system-side current can be detected in real time, the on-off of the three-phase circuit can be controlled to absorb energy from the power grid and convert the energy among the three-phase circuits to balance the three-phase current, and a series of work can be performed, so that the automation and intelligence degree is high, the total harmonic distortion of the lower power grid can be eliminated, the reactive power can be compensated to improve the power factor of the power grid, the size of the imbalance current can be continuously adjusted in two directions, the response speed is fast, the power grid impedance has little influence, the separate and centralized adjustment of multiple imbalance loads can be realized, the versatility is high, and the application range is wide.
[0033] Preferably, the compensation current generating circuit 22 is further provided with a fourth bridge arm, the midpoint of the fourth bridge arm is connected with the neutral line through the bus capacitor module 3, in the specific implementation, the compensation current generating circuit 22 comprises power transistors T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, inductors L1, L2, L4, L5, L7, L8, L N , diodes D1, D2, D3, D4, D5, D6, D7 and D8, and the bus capacitor module 3 is provided with bus capacitors C d1 and C d2 ;
[0034] The emitter of the power transistor T2 and the collector of the power transistor T3 are connected to the first end of the inductor L2, the second end of the inductor L2 is connected to the A line in the three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L1, the collector of the power transistor T2 is connected to the cathode of the diode D1 and the emitter of the power transistor T1 respectively, the emitter of the power transistor T3 is connected to the anode of the diode D2 and the collector of the power transistor T4 respectively, the collector of the power transistor T1 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T4;
[0035] The emitter of the power transistor T6 and the collector of the power transistor T7 are connected to the first end of the inductor L5, the second end of the inductor L5 is connected to the B line in the three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L4, the collector of the power transistor T6 is connected to the cathode of the diode D3 and the emitter of the power transistor T5 respectively, the emitter of the power transistor T7 is connected to the anode of the diode D4 and the collector of the power transistor T8 respectively, the collector of the power transistor T5 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T8;
[0036] The emitter of the power transistor T10 and the collector of the power transistor T11 are connected to the first end of the inductor L8, the second end of the inductor L8 is connected to the C line in the three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L7, the collector of the power transistor T10 is connected to the cathode of the diode D5 and the emitter of the power transistor T9 respectively, the emitter of the power transistor T11 is connected to the anode of the diode D6 and the collector of the power transistor T12 respectively, the collector of the power transistor T9 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T12;
[0037] The emitter of the power transistor T14 and the collector of the power transistor T15 are connected to the first end of the inductor L N , the second end of the inductor L N is connected to the neutral line, the collector of the power transistor T14 is connected to the cathode of the diode D7 and the emitter of the power transistor T13 respectively, the emitter of the power transistor T15 is connected to the anode of the diode D8 and the collector of the power transistor T16 respectively, the collector of the power transistor T13 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T16;
[0038] The gate of the power transistor T1, the gate of the power transistor T2, the gate of the power transistor T3, the gate of the power transistor T4, the gate of the power transistor T5, the gate of the power transistor T6, the gate of the power transistor T7, the gate of the power transistor T8, the gate of the power transistor T9, the gate of the power transistor T10, the gate of the power transistor T11, the gate of the power transistor T12, the gate of the power transistor T13, the gate of the power transistor T14, the gate of the power transistor T15, and the gate of the power transistor T16 are connected with the central control module 1 respectively, and the anode of the diode D1, the cathode of the diode D2, the anode of the diode D3, the cathode of the diode D4, the anode of the diode D5, the cathode of the diode D6, the anode of the diode D7, and the cathode of the diode D8 are connected.
[0039] In the working process of the embodiment, the on-off of the power transistors is controlled by the central control module 1 to realize three-phase current balance, thereby stabilizing the voltage, reducing the power consumption, improving the power factor, realizing the energy-saving function, and increasing the fourth bridge arm, so that the midpoint of the fourth bridge arm is connected with the neutral line through the bus capacitor module 3, the control decoupling of the neutral line current and the three-phase currents of the A line, the B line, and the C line can be realized, the control precision and the control ability of the unbalanced current can be increased, and the energy-saving effect can be further improved.
[0040] In the specific implementation, when the average current of the three-phase load active current is 10A, and the load current on the C line is 15A, the central control module 1 samples that the current on the C line is higher than the average current, at this time, the on-off of the power transistors T9, T10, T11, and T12 is controlled, so that the bus capacitor module 3 can discharge on the C line, and the discharge current is 5A, at this time, the current on the C line is 10A, when the load current on the A line is 5A, the on-off of the power transistors T1, T2, T3, and T4 is controlled to charge on the bus capacitor module 3, and the charging current is 5A, so that the current on the A line becomes 10A, so that the three-phase currents are all 10A, and the three-phase current balance is completed.
[0041] As a further improvement of the embodiment, a filter circuit 4 for filtering high-order harmonics is further included, the filter circuit 4 includes inductance L3, inductance L6, inductance L9, resistance R1, resistance R2, resistance R3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, and capacitor C6, the second end of the inductance L2 is connected to the neutral line through the capacitor C1 and the inductance R1 and connected to the center line through the capacitor C2 and the inductance L3, the second end of the inductance L5 is connected to the neutral line through the capacitor C3 and the inductance R2 and connected to the center line through the capacitor C4 and the inductance L6, the second end of the inductance L8 is connected to the neutral line through the capacitor C5 and the inductance R3 and connected to the center line through the capacitor C6 and the inductance L9, preferably, the resonance frequency of the capacitor C2 and the inductance L3 is set to be equal to the switching frequency of the power transistor T1, the power transistor T2, the power transistor T3, and the power transistor T4, the resonance frequency of the capacitor C4 and the inductance L6 is set to be equal to the switching frequency of the power transistor T5, the power transistor T6, the power transistor T7, and the power transistor T8, the resonance frequency of the capacitor C3 and the inductance L9 is set to be equal to the switching frequency of the power transistor T9, the power transistor T10, the power transistor T11, and the power transistor T12, which can filter the high-order harmonics of the same size as the switching frequency of the power transistor on the three-phase upper, and filter the high-order harmonics above the cutoff frequency, compared with the circuit of simply connecting the inductance in series, the volume of the inductance on the main circuit can be greatly reduced under the same output current condition.
[0042] Preferably, it further comprises an AD signal detection module 5 and a conditioning unit 6, the AD signal detection module 5 comprises a three-phase load current signal detection circuit, a three-phase APF output current detection circuit, a three-phase LC output current detection circuit, a two-way DC side capacitor voltage detection circuit, an IGBT temperature detection circuit, and a DC bus voltage detection circuit, the three-phase load current signal detection circuit, the three-phase APF output current detection circuit, the three-phase LC output current detection circuit, the two-way DC side capacitor voltage detection circuit, the IGBT temperature detection circuit, and the DC bus voltage detection circuit are connected with the central control module 1 through the conditioning unit 6, the detection end of the three-phase load current signal detection circuit, the detection end of the three-phase APF output current detection circuit, the detection end of the three-phase LC output current detection circuit, the detection end of the two-way DC side capacitor voltage detection circuit, the detection end of the IGBT temperature detection circuit, and the detection end of the DC bus voltage detection circuit are connected with the corresponding parts in the terminal electrical comprehensive treatment and protection module, which can realize comprehensive monitoring of the three-phase circuit, thereby further improving the control precision and control effect, preferably, it further comprises a protection circuit 7 for protecting the fault-free operation of the enhanced active power filter module, the detection end of the protection circuit 7 is connected with the bus capacitor module 3 and the enhanced active power filter module, and the protection circuit 7 outputs a protection signal to the central control module 1 to execute protection work to cut off the circuit when detecting that the bus capacitor module 3 voltage is too high, the upper and lower capacitor difference is large, the output current is abnormal, the grid voltage is abnormal, or the power device temperature is too high, as a further improvement of the embodiment, it further comprises a PWM isolation driving module 8, the central control module 1 is connected with the compensation current generation circuit 22 through the PWM isolation driving module 8, and the PWM isolation driving module 8 receives a control signal to output a PWM driving signal with driving capability to the compensation current generation circuit 22 after the central control module 1 completes operation processing.
[0043] In specific implementation, it further comprises a communication module for networked communication and a touch screen module for human-computer interaction, the communication module and the touch screen module are connected with the central control module 1, the communication module is provided with at least one of an RS485 communication circuit, an RS232 communication circuit, and a CAN communication circuit, in operation, the central control module 1 can select a 32-bit floating-point microprocessor TMS320C28346 of TI company, preferably, it can be assisted with an EPM570T100 CPLD chip of Altera company, which can perform some logical processing work of digital signals, and has high working efficiency.
[0044] The beneficial technical effects of the embodiment include that the utility model can carry out real-time detection of system side current, control three-phase circuit on-off, absorb energy from power grid and convert among three-phase circuits to make three-phase current reach balanced state and a series of work, and has high automation and intelligent degree, thereby realizing elimination of lower power grid total harmonic distortion of harmonic, compensation of reactive power, improvement of power factor of power grid, simultaneous realization of bidirectional continuous regulation when regulating size of unbalanced current, fast response speed, difficulty in being affected by power grid impedance, realization of separate and centralized regulation of multiple unbalanced loads, strong universality, wide application range.
[0045] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, and those skilled in the art should understand that the utility model includes but is not limited to the content described in the drawings and the above specific embodiment. Any modification not deviating from the function and structural principle of the utility model will be included in the scope of claims.
Claims
1. A power saving terminal electrical comprehensive management protection module, characterized in that: The application relates to a three-phase unbalance compensation device, which comprises a central control module (1) for data processing and overall control of the circuit, an enhanced active power filter module for regulating three-phase unbalance, and a bus capacitor module (3) for balancing the current of each phase through charging and discharging, wherein the enhanced active power filter module comprises a sampling module (21) for real-time detection of system-side voltage and current, and a compensation current generating circuit (22) for controlling the on-off of the three-phase circuit to absorb energy from the power grid and convert among the three-phase circuits to balance the three-phase current; the sampling end of the sampling module (21) is arranged on the three-phase circuit between the power grid and the corresponding three-phase unbalanced load and the neutral line; the signal output end of the sampling module (21) is connected with the central control module (1); the control output end of the central control module (1) is connected with the control input end of the compensation current generating circuit (22); and the bus capacitor module (3) is connected with the three-phase circuit between the power grid and the corresponding three-phase unbalanced load and the neutral line through the compensation current generating circuit (22).
2. The power saving and energy saving terminal electrical comprehensive management protection module according to claim 1, characterized in that: The compensation current generating circuit (22) is further provided with a fourth bridge arm, and the midpoint of the fourth bridge arm is connected with the neutral line through the bus capacitor module (3).
3. The power saving and energy saving terminal electrical comprehensive management protection module according to claim 1, characterized in that: The compensation current generating circuit (22) comprises power transistor T1, power transistor T2, power transistor T3, power transistor T4, power transistor T5, power transistor T6, power transistor T7, power transistor T8, power transistor T9, power transistor T10, power transistor T11, power transistor T12, power transistor T13, power transistor T14, power transistor T15, power transistor T16, inductor L1, inductor L2, inductor L4, inductor L5, inductor L7, inductor L8, inductor L N , diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, and diode D8, the bus capacitor module (3) is provided with bus capacitor C d1 , and bus capacitor C d2 ; The emitter of the power transistor T2 and the collector of the power transistor T3 are connected with the first end of the inductor L2, the second end of the inductor L2 is connected with the A line in the three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L1, the collector of the power transistor T2 is connected with the cathode of the diode D1 and the emitter of the power transistor T1 respectively, the emitter of the power transistor T3 is connected with the anode of the diode D2 and the collector of the power transistor T4 respectively, the collector of the power transistor T1 is connected with the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T4. The emitter of the power transistor T6 and the collector of the power transistor T7 are connected to the first end of the inductor L5, the second end of the inductor L5 is connected to the B line in the three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L4, the collector of the power transistor T6 is connected to the cathode of the diode D3 and the emitter of the power transistor T5 respectively, the emitter of the power transistor T7 is connected to the anode of the diode D4 and the collector of the power transistor T8 respectively, the collector of the power transistor T5 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T8. The emitter of the power transistor T10 and the collector of the power transistor T11 are connected to the first end of the inductor L8, the second end of the inductor L8 is connected to the C line in the three-phase circuit between the power grid and the corresponding three-phase unbalanced load through the inductor L7, the collector of the power transistor T10 is connected to the cathode of the diode D5 and the emitter of the power transistor T9 respectively, the emitter of the power transistor T11 is connected to the anode of the diode D6 and the collector of the power transistor T12 respectively, the collector of the power transistor T9 is connected to the bus capacitor C d1 and the bus capacitor C d2 and the emitter of the power transistor T12. The emitter of the power transistor T14 and the collector of the power transistor T15 are connected with the first end of the inductor L N The second end of the inductor L N is connected with the neutral line, the collector of the power transistor T14 is connected with the cathode of the diode D7 and the emitter of the power transistor T13 respectively, the emitter of the power transistor T15 is connected with the anode of the diode D8 and the collector of the power transistor T16 respectively, the collector of the power transistor T13 is connected with the emitter of the power transistor T16 through the bus capacitor C d1 and the bus capacitor C d2 The gate of the power transistor T1, the gate of the power transistor T2, the gate of the power transistor T3, the gate of the power transistor T4, the gate of the power transistor T5, the gate of the power transistor T6, the gate of the power transistor T7, the gate of the power transistor T8, the gate of the power transistor T9, the gate of the power transistor T10, the gate of the power transistor T11, the gate of the power transistor T12, the gate of the power transistor T13, the gate of the power transistor T14, the gate of the power transistor T15 and the gate of the power transistor T16 are connected with the central control module (1) respectively, and the anode of the diode D1, the cathode of the diode D2, the anode of the diode D3, the cathode of the diode D4, the anode of the diode D5, the cathode of the diode D6, the anode of the diode D7 and the cathode of the diode D8 are connected.
4. The power saving and energy saving terminal electrical comprehensive management protection module according to claim 3, characterized in that: The application further comprises a filter circuit (4) for filtering high-order harmonics, which comprises an inductor L3, an inductor L6, an inductor L9, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6; the second end of the inductor L2 is connected with the neutral line through the capacitor C1 and the inductor R1 and connected with the center line through the capacitor C2 and the inductor L3; the second end of the inductor L5 is connected with the neutral line through the capacitor C3 and the inductor R2 and connected with the center line through the capacitor C4 and the inductor L6; and the second end of the inductor L8 is connected with the neutral line through the capacitor C5 and the inductor R3 and connected with the center line through the capacitor C6 and the inductor L9.
5. The power saving and energy saving terminal electrical comprehensive management protection module according to claim 4, characterized in that: The resonance frequency of the capacitor C2 and the inductor L3 is set to be equal to the switching frequency of the power transistor T1, the power transistor T2, the power transistor T3 and the power transistor T4, the resonance frequency of the capacitor C4 and the inductor L6 is set to be equal to the switching frequency of the power transistor T5, the power transistor T6, the power transistor T7 and the power transistor T8, and the resonance frequency of the capacitor C3 and the inductor L9 is set to be equal to the switching frequency of the power transistor T9, the power transistor T10, the power transistor T11 and the power transistor T12.
6. The power saving and energy saving terminal electrical comprehensive management protection module according to claim 1, characterized in that: Further comprising an AD signal detection module (5) and a conditioning unit (6), the AD signal detection module (5) comprises a three-phase load current signal detection circuit, a three-phase APF output current detection circuit, a three-phase LC output current detection circuit, a two-way DC side capacitor voltage detection circuit, an IGBT temperature detection circuit and a DC bus voltage detection circuit, the three-phase load current signal detection circuit, the three-phase APF output current detection circuit, the three-phase LC output current detection circuit, the two-way DC side capacitor voltage detection circuit, the IGBT temperature detection circuit and the DC bus voltage detection circuit are connected with the central control module (1) through the conditioning unit (6), and the detection end of the three-phase load current signal detection circuit, the detection end of the three-phase APF output current detection circuit, the detection end of the three-phase LC output current detection circuit, the detection end of the two-way DC side capacitor voltage detection circuit, the detection end of the IGBT temperature detection circuit and the detection end of the DC bus voltage detection circuit are connected with corresponding parts in the terminal electrical comprehensive treatment and protection module.
7. The power saving and energy saving terminal electrical comprehensive management protection module according to claim 1, characterized in that: Further comprising a protection circuit (7) for protecting the fault-free operation of the enhanced active power filter module, the detection end of the protection circuit (7) is connected with the bus capacitor module (3) and the enhanced active power filter module, and the protection circuit (7) outputs a protection signal to the central control module (1) to perform protection work to cut off the circuit when detecting that the bus capacitor module (3) voltage is too high, the upper and lower capacitor difference is large, the output current is abnormal, the grid voltage is abnormal or the power device temperature is too high.
8. The power saving and energy saving terminal electrical comprehensive management protection module according to claim 1, characterized in that: Further comprising a PWM isolation driving module (8), the central control module (1) is connected with the compensation current generating circuit (22) through the PWM isolation driving module (8), and the PWM isolation driving module (8) receives a control signal to output a PWM driving signal with driving ability to the compensation current generating circuit (22) after the central control module (1) completes operation processing.
9. The power saving and energy saving terminal electrical comprehensive management and protection module according to claim 1, characterized in that: Further comprising a communication module for networking communication and a touch screen module for human-computer interaction, and the communication module and the touch screen module are connected with the central control module (1).
10. The power saving and energy saving terminal electrical comprehensive management and protection module according to claim 9, characterized in that: The communication module is provided with at least one of an RS485 communication circuit, an RS232 communication circuit and a CAN communication circuit.