Power grid intelligent energy-saving system based on electromagnetic balance and flexible compensation

Abstract

The invention discloses a power grid intelligent energy-saving system based on electromagnetic balance and flexible compensation, and the system comprises an electromagnetic adjustment module which is connected with a power grid and is used for adjusting the power quality of the power grid, and feeding back the real-time operation state data of the electromagnetic adjustment module to an intelligent control module; the intelligent control module is connected with the electromagnetic adjusting module, the phase sequence recovery module and the man-machine interaction module, carries out analysis processing based on the received data, sends a control instruction to the electromagnetic adjusting module and the phase sequence recovery module according to an analysis result, receives an operation instruction of the man-machine interaction module and feeds back system state information to the man-machine interaction module. The system can significantly improve the three-phase imbalance state of a power grid, effectively suppress harmonic pollution, improve power factor and voltage stability, and quickly correct phase sequence errors, thereby comprehensively improving the electric energy quality of the power grid. Through intelligent dynamic adjustment and a pre-judgment type compensation strategy, line loss and equipment energy consumption are greatly reduced, and the overall operation efficiency of a power grid is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy-saving systems, and relates to an intelligent energy-saving system for power grids based on electromagnetic balance and flexible compensation. BACKGROUND

[0002] With the continuous development of power systems and the diversified growth of power loads, modern power grids are facing increasingly complex operation challenges. The access of various nonlinear loads, distributed energy and unbalanced distribution of three-phase loads leads to problems such as three-phase imbalance, harmonic pollution, low power factor, voltage fluctuation, etc. in power grids, which not only affects power quality, but also increases line loss, reduces power supply efficiency, and even threatens the safe and stable operation of electrical equipment.

[0003] At the same time, traditional power grid control devices are mostly designed for single function, lack systematic collaborative control capability, are difficult to respond to power grid dynamic changes in real time, and rely more on manual intervention, which is insufficient in intelligentization, and cannot meet the needs of modern power grids for efficient, stable and energy-saving operation. Therefore, an integrated system that can comprehensively solve the above problems and realize overall perception, intelligent adjustment and efficient management of power grid state is needed to improve the overall operation level of power grids. SUMMARY

[0004] To solve the above technical problems, the application adopts the following technical solutions:

[0005] An intelligent energy-saving system for power grids based on electromagnetic balance and flexible compensation, comprising an electromagnetic adjustment module, an intelligent control module, a data acquisition module, a phase sequence recovery module and a man-machine interaction module.

[0006] The electromagnetic adjustment module comprises a three-phase winding, an adjustable capacitor, a thyristor voltage regulation module, an equivalent inductor and a nonlinear resistor; it is connected with the power grid and used for adjusting power quality of the power grid, and feeds back real-time operation state data of itself to the intelligent control module;

[0007] The data acquisition module is connected with the intelligent control module and used for acquiring real-time operation data of the power grid and the electromagnetic adjustment module, and transmitting the data to the intelligent control module;

[0008] The phase sequence recovery module is connected with the power grid and used for real-time monitoring of phase relationship of three-phase voltage, and sends a signal to the intelligent control module when detecting a phase sequence error;

[0009] The phase sequence recovery module is also connected with the electromagnetic adjustment module and can quickly adjust the phase sequence to a correct state.

[0010] The intelligent control module is connected with the electromagnetic adjusting module, the phase sequence recycling module and the man-machine interaction module, analyzes and processes received data, sends control instructions to the electromagnetic adjusting module and the phase sequence recycling module according to the analysis result, receives operation instructions of the man-machine interaction module and feeds back system state information to the man-machine interaction module.

[0011] As a further scheme of the present application, the three-phase winding comprises a three-column core and three-phase conductors connected with three-phase voltage of a power grid; the three-phase conductors are wound on three end portions of the three-column core in a heterogeneous winding mode and are not connected with each other.

[0012] As a further scheme of the present application, the adjustable capacitor is connected with the three-phase winding in a parallel connection mode, one end of the adjustable capacitor is connected to a corresponding phase outlet end of the three-phase winding, and the other end is connected to a system neutral point or other reference potential point.

[0013] As a further scheme of the present application, the thyristor voltage regulating module is connected with an output line of the three-phase winding in a series connection mode and monitors output voltage in real time.

[0014] As a further scheme of the present application, the number of equivalent inductors is three, and the equivalent inductors are ferrite core equivalent inductors, and each equivalent inductor is connected in series with a phase line of the three-phase winding.

[0015] As a further scheme of the present application, the number of nonlinear resistors is also three, each nonlinear resistor is connected in series with an equivalent inductor on a corresponding phase line and then connected with a phase line of the three-phase winding.

[0016] As a further scheme of the present application, the intelligent control module uses a DSP chip with a model of TMS320F28335 as a core controller, receives real-time data of the data acquisition module, generates control instructions through a built-in algorithm, and drives the electromagnetic adjusting module and the phase sequence recycling module to act.

[0017] As a further scheme of the present application, the data acquisition module comprises voltage sensors, current sensors, temperature sensors and phase sequence sensors, and real-time collects parameters such as voltage, current, harmonic component, power factor, device operating temperature and phase sequence state of the power grid, and transmits data to the intelligent control module through a wire.

[0018] As a further scheme of the present application, the phase sequence recycling module comprises:

[0019] The phase sequence detection unit comprises a Hall sensor and is connected with the power grid through the Hall sensor to monitor a phase relationship of three-phase voltage in real time;

[0020] The phase sequence correction unit comprises a contactless switching switch connected with the electromagnetic adjusting module, and quickly adjusts the phase sequence to a correct state under the instruction of the intelligent control module.

[0021] As a further scheme of the present application: the human-computer interaction module comprises a touch screen and a remote communication interface, which can display the system running state, parameter curve and phase sequence state locally, and also can realize remote monitoring and parameter setting through a cloud platform.

[0022] The present application has the following advantages: the system can significantly improve the three-phase unbalanced state of the power grid, effectively suppress harmonic pollution, improve power factor and voltage stability, quickly correct phase sequence errors, and thus comprehensively improve the power quality of the power grid; through intelligent dynamic adjustment and predictive compensation strategy, the line loss and equipment energy consumption are greatly reduced, and the overall operation efficiency of the power grid is improved.

[0023] At the same time, the system has perfect safety protection mechanism and convenient monitoring function, which can ensure the safe and stable operation of the power grid equipment, reduce the cost of manual intervention, realize the intelligent, efficient and energy-saving management of the power grid, and is suitable for various complex power consumption scenes, and has wide practicability and significant comprehensive benefits. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a schematic diagram of the system module structure of the present application.

[0025] Fig. 2 is a schematic diagram of the module structure of the electromagnetic adjustment module in the present application.

[0026] Fig. 3 is a schematic diagram of the structure of the three-phase winding in the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. It should be understood that the present application is not limited by the example embodiments disclosed herein. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 of the present application.

[0029] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an implied order of magnitude. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0030] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] The present application provides Figs. 1-3 In the embodiments of the present application, a smart energy-saving system for power grid based on electromagnetic balance and flexible compensation, the system structure comprises:

[0032] The electromagnetic adjusting module 1 comprises: a three-phase winding 11, an adjustable capacitor 15, a thyristor voltage regulating module 12, an equivalent inductor 13 and a nonlinear resistor 14; connected with the power grid, used for adjusting power quality of the power grid, and feeding back real-time running state data of itself to the intelligent control module 3;

[0033] The three-phase winding 11 comprises: a three-column type iron core 112 made of high-permeability silicon steel sheet and three-phase conductors 111 connected with three-phase voltage of the power grid; the three-phase conductors 111 are wound on the three end portions of the three-column type iron core 112 in a heterogeneous winding manner, and are not connected with each other, a specific electromagnetic coupling relationship is formed through the heterogeneous winding manner (heterogeneous winding turn ratio 1:1.2:1.5), and dynamic compensation of the electromagnetic balance principle is realized through the structure, so that the three-phase unbalance degree can be controlled within 5%.

[0034] The adjustable capacitor 15 is connected in parallel with the three-phase winding 11, one end of the adjustable capacitor 15 is connected to the corresponding phase outlet end of the three-phase winding 11, and the other end is connected to a neutral point or other reference potential point in the system. Taking the A-phase winding as an example, one terminal of the adjustable capacitor 15 is connected with the A-phase winding outlet end, and the other terminal is connected to the neutral point, and the B-phase and the C-phase are the same. Through this connection, the intelligent control module 3 can dynamically control the input or removal of the capacitor group according to the real-time parameters of the power grid, so as to compensate the reactive power and improve the power factor.

[0035] The thyristor voltage regulating module 12 is connected in series to the output line of the three-phase winding 11, and monitors the output voltage in real time. When the detected voltage exceeds the rated value by ±2%, the intelligent control module 3 sends a control signal to the thyristor voltage regulating module 12 to adjust the conduction angle of the thyristor and change the output voltage, thereby maintaining voltage stability.

[0036] The number of equivalent inductors 13 is three, and the equivalent inductor 13 is a ferrite core equivalent inductor 13. Each equivalent inductor 13 is connected in series to each phase line of the three-phase winding 11, for example, the equivalent inductor 13 is connected in series to the A-phase line, and the B-phase and C-phase lines are also connected in series to the corresponding equivalent inductor 13. When high-order harmonics exist in the power grid, the equivalent inductor 13 exhibits high impedance characteristics to harmonics, thereby effectively blocking the circulation path of 5th and higher order harmonics, reducing the total harmonic distortion rate, and cooperating with the blocking characteristics of the three-column core 112 structure to block the circulation path of the third and its multiple harmonics, thereby reducing the total harmonic distortion rate (THD) from 15% to below 5%.

[0037] The number of nonlinear resistors 14 is also three, and each nonlinear resistor 14 is connected in series with the equivalent inductor 13 on the corresponding phase line, and then connected to the phase line of the three-phase winding 11. When connecting, one end of the series circuit composed of the nonlinear resistor 14 and the inductor is connected to a certain phase in the three-phase line, and the other end is connected to the neutral point or the ground. When a transient surge with an amplitude exceeding 1.5 times the rated voltage occurs, the series circuit quickly acts to block and absorb the transient surge, protecting the subsequent circuit equipment.

[0038] The data acquisition module 4 is connected to the intelligent control module 3 and is used to acquire real-time operation data of the power grid and the electromagnetic regulating module 1, and transmit the data to the intelligent control module 3. It specifically includes: configuring voltage sensors, current sensors, temperature sensors, and phase sequence sensors, and real-time acquisition of voltage, current, harmonic components, power factor, device operating temperature, and phase sequence state parameters of the power grid, and data transmission to the intelligent control module 3 through wires.

[0039] The phase sequence recovery module 2 includes a phase sequence detection unit 21 and a phase sequence correction unit 22.

[0040] The phase sequence detection unit 21 includes a Hall sensor and is connected to the power grid through the Hall sensor to monitor the phase relationship of the three-phase voltage in real time. When a phase sequence error is detected, a signal is immediately sent to the intelligent control module 3.

[0041] The phase sequence correction unit 22 includes a contactless switching switch connected to the electromagnetic regulating module 1. Under the instruction of the intelligent control module 3, the phase sequence is quickly adjusted to the correct state without affecting the normal operation of the load, ensuring that the device works in the correct phase sequence, avoiding efficiency loss and device damage caused by phase sequence errors.

[0042] The intelligent control module 3 is connected with the electromagnetic adjustment module 1, the phase sequence recovery module 2 and the man-machine interaction module 5 respectively, analyzes and processes based on the received data, sends control instructions to the electromagnetic adjustment module 1 and the phase sequence recovery module 2 according to the analysis result, receives the operation instruction of the man-machine interaction module 5 and feeds back the system state information to the man-machine interaction module 5;

[0043] The intelligent control module 3 adopts a DSP chip with a model of TMS320F28335 as a core controller, and the control logic is realized through the following algorithms:

[0044] The three-phase balance adjustment algorithm: when the data acquisition module 4 detects that there is a difference in the three-phase current (for example, the A, B and C phase currents are 800A, 600A and 700A), the amplitude and phase of the compensation current are calculated, and the three-phase winding 11 is driven to dynamically adjust through the out-of-phase coupling characteristics, and the adjustment accuracy reaches ±1%;

[0045] The harmonic analysis algorithm: the fast Fourier transform (FFT) is used to decompose the current signal, identify the 3-25 harmonic components, and start the equivalent inductance 13 of the electromagnetic adjustment module 1 for harmonic suppression;

[0046] The phase sequence recovery algorithm: the phase sequence of the three-phase voltage transmitted by the phase sequence detection unit 21 is compared in real time, when the phase sequence error is detected, the correction logic is calculated within 10ms, and the no-contact switching switch of the phase sequence correction unit 22 is driven to act;

[0047] The dynamic compensation strategy: based on the sliding window algorithm (window size 100ms), the load fluctuation trend is predicted, the compensation amount of the adjustable capacitor 15, the voltage threshold of the thyristor voltage regulation module 12 and the response parameters of the phase sequence recovery module 2 are adjusted in advance, and the predictive optimization control is realized.

[0048] The man-machine interaction module 5 includes a touch screen and a remote communication interface, which can display the system running state, parameter curve and phase sequence state locally, and can also realize remote monitoring and parameter setting through a cloud platform.

[0049] In the embodiment of the application, a specific working process of the power grid intelligent energy-saving system based on electromagnetic balance and flexible compensation is also provided, and the process specifically includes:

[0050] The data acquisition stage: the data acquisition module 4 acquires the power grid parameters in real time and transmits them to the intelligent control module 3; and it is assumed that, in this stage, the three-phase current of the electromagnetic adjustment module 1 is 800A / 600A / 700A, the THD is 15%, the power factor is 0.82, and the phase sequence is wrong;

[0051] Analysis decision stage: intelligent control module 3 determines that the three-phase unbalance degree is 12% (exceeding the standard), THD is 15% (exceeding the standard), and the phase sequence is wrong through algorithm analysis, and triggers the adjustment instruction.

[0052] Dynamic adjustment stage:

[0053] Electromagnetic adjustment module 1: the three-phase balance adjustment unit tends to balance the three-phase current (720A / 710A / 705A) through out-of-phase winding coupling compensation; the power factor improvement unit adjusts the capacitor group to improve the power factor to 0.96; the harmonic suppression unit starts the 10mH equivalent inductance 13 to reduce the THD to 4.5%; and the thyristor voltage regulation module 12 maintains the output voltage at 380V±2%.

[0054] Phase sequence recovery module 2: the phase sequence correction unit 22 completes the switching of A and C phases within 30ms to restore the correct phase sequence.

[0055] Feedback optimization stage: the adjusted data is fed back to the intelligent control module 3 through the collection module, the compensation strategy is optimized through big data algorithm, and closed-loop control is formed.

[0056] It is also necessary to note that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0057] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A smart energy-saving system for power grid based on electromagnetic balance and flexible compensation, characterized in that: include: Electromagnetic regulation module, intelligent control module, data acquisition module, phase sequence recovery module and human-computer interaction module; The electromagnetic regulation module includes: three-phase winding, adjustable capacitor, thyristor voltage regulation module, equivalent inductor and nonlinear resistor; it is connected to the power grid to regulate the power quality of the grid and feed back its real-time operating status data to the intelligent control module; The data acquisition module is connected to the intelligent control module to collect real-time operating data of the power grid and the electromagnetic regulation module, and transmit the data to the intelligent control module; The phase sequence recovery module is connected to the power grid to monitor the phase relationship of the three-phase voltage in real time. When a phase sequence error is detected, a signal is sent to the intelligent control module; The phase sequence recovery module is also connected to the electromagnetic adjustment module, which can quickly adjust the phase sequence to the correct state; The intelligent control module is connected to the electromagnetic regulation module, phase sequence recovery module and human-computer interaction module respectively. It analyzes and processes the received data, sends control instructions to the electromagnetic regulation module and phase sequence recovery module according to the analysis results, and receives operation instructions from the human-computer interaction module and feeds back system status information to it.

2. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 1, characterized in that: The three-phase winding includes: a three-column iron core and three-phase conductors connected to the three-phase voltage of the power grid; the three-phase conductors are wound around the three ends of the three-column iron core in an out-of-phase winding manner and are not connected to each other.

3. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 2 is characterized in that: The adjustable capacitor is connected in parallel to the three-phase winding, with one end of the adjustable capacitor connected to the corresponding phase output terminal of the three-phase winding, and the other end connected to the system neutral point or other reference potential point.

4. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 2, characterized in that: The thyristor voltage regulating module is connected in series to the output line of the three-phase winding to monitor the output voltage in real time.

5. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 2, characterized in that: There are three groups of equivalent inductors, and the equivalent inductors are ferrite core equivalent inductors. Each equivalent inductor is connected in series to each phase line of the three-phase winding.

6. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 5, characterized in that: The number of nonlinear resistors is also three. Each nonlinear resistor is connected in series with the equivalent inductance on the corresponding phase line and then connected to the phase line of the three-phase winding.

7. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 1, characterized in that: The intelligent control module uses the TMS320F28335 DSP chip as the core controller, receives real-time data from the data acquisition module, generates control instructions through the built-in algorithm, and drives the electromagnetic regulation module and phase sequence recovery module to operate.

8. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 1, characterized in that: The data acquisition module includes: voltage sensor, current sensor, temperature sensor and phase sequence sensor, which collect the voltage, current, harmonic components, power factor, equipment operating temperature and phase sequence status of the power grid in real time. The data is transmitted to the intelligent control module through wires.

9. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 1, characterized in that: Phase sequence recovery module includes: The phase sequence detection unit includes: a Hall sensor, which is connected to the power grid to monitor the phase relationship of the three-phase voltage in real time; The phase sequence correction unit includes: a contactless switching switch connected to the electromagnetic adjustment module, which quickly adjusts the phase sequence to the correct state under the instruction of the intelligent control module.

10. The intelligent energy-saving system for power grid based on electromagnetic balance and flexible compensation according to claim 1, characterized in that: The human-computer interaction module includes: a touch screen and a remote communication interface. When in use, it can locally display the system operation status, parameter curves and phase sequence status, and can also achieve remote monitoring and parameter setting through the cloud platform.

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