CN116826761A - Electromagnetic type electric energy quality unified controller - Google Patents
Electromagnetic type electric energy quality unified controller Download PDFInfo
- Publication number
- CN116826761A CN116826761A CN202311087733.9A CN202311087733A CN116826761A CN 116826761 A CN116826761 A CN 116826761A CN 202311087733 A CN202311087733 A CN 202311087733A CN 116826761 A CN116826761 A CN 116826761A
- Authority
- CN
- China
- Prior art keywords
- voltage
- controller
- current
- load
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001939 inductive effect Effects 0.000 claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 238000003908 quality control method Methods 0.000 claims abstract description 3
- 230000000694 effects Effects 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model discloses an electromagnetic type electric energy quality unified controller relates to electric energy quality control device field, and this controller includes: input side three-phase series reactance, three-phase filter, three-phase pressure sensitive inductance and ground connection transformer. The input of the controller is three-phase alternating current, the input side is connected with a three-phase series reactance, the three-phase filter is used for filtering odd harmonic waves and providing capacitive current, the pressure-sensitive inductor is used for providing inductive variable current, and the grounding transformer is used for leading out a three-phase alternating current output end with a neutral point. Under the combined action of the filter and the pressure-sensitive inductor, when the power grid voltage is the same as the load voltage, the controller is automatically in an off-line state and does not compensate, and when the power grid voltage fluctuates within a design range, the controller automatically compensates to ensure the stability of a power supply at the load side. In addition, the controller has the functions of stabilizing line voltage, filtering harmonic waves and improving unbalanced load, and can comprehensively regulate and control the quality of electric energy.
Description
Technical Field
The invention belongs to the field of power quality control devices, and particularly relates to an electromagnetic power quality controller.
Background
With the development of economy, various sensitive loads are put into use in a large number of grid-connected modes, including a data center, various controllers, a precision motor and the like, and the loads are very sensitive to voltage abrupt changes, particularly voltage sag, and when the voltage sag occurs, serious economic losses are often caused by power failure and tripping. There is therefore a need for a device that ensures a smooth load side voltage when a grid voltage dip (or sudden change) occurs, maintaining the equipment in normal operation.
Disclosure of Invention
The invention provides an electromagnetic type power quality unified controller which can ensure that load voltage is kept stable when power grid voltage fluctuates.
According to an aspect of the embodiment of the invention, an electromagnetic type unified controller for electric energy quality is provided, the controller inputs and outputs three-phase alternating current, an output side of the controller is connected with a grounding transformer for providing neutral point extraction for an output end, an input side of the controller is connected with a three-phase inductor, a filter for filtering odd harmonic waves and providing capacitive current and a pressure sensitive inductor for providing inductive current, under the action of the combination of the capacitive current of the filter and the inductive current of the pressure sensitive inductor, when the voltage of a power grid is the same as the voltage of a load, the controller is automatically in an off-line state and does not compensate, and when the voltage of the power grid fluctuates within a design range, the controller automatically compensates to ensure the stability of a power supply at the load side.
In some examples, the rated capacitive current of the filter is equal to the rated inductive output current of the pressure sensitive inductor.
In some examples, the output inductor current is 0 when the voltage across the voltage-sensitive inductor is below a minimum user-required voltage for the rated voltage, and twice the rated current is output when the voltage across the voltage-sensitive inductor is above a user-specified maximum voltage.
In some examples, two sets of the voltage-sensitive inductances in series on three phases are connected in parallel with each other.
In some examples, when the load voltage is equal to the grid voltage, the capacitive current and the inductive current cancel each other, causing the load to be connected directly to the power source side.
In some examples, when the load voltage is less than the minimum user required voltage of the rated voltage, the capacitive current provided by the filter acts to boost the power grid voltage, so that the stability of the load voltage is ensured.
In some examples, when the load voltage is greater than the highest voltage specified by the user, the capacitive current provided by the filter and the inductive current provided by the voltage-sensitive inductor are combined to reduce the power grid voltage, so that the stability of the load voltage is ensured.
The invention has the beneficial effects that:
1. the stability of load voltage can be automatically realized without any programmable control equipment, and the response speed is high;
2. the filter device and the voltage stabilizing device are integrated, so that the comprehensive control of the electric energy quality can be realized;
3. the controller has a certain capacity of balancing three-phase load, and can effectively reduce negative sequence current;
4. because passive devices are adopted, the device can resist high voltage, compared with active electricity based on power electronic devices
The quality controller is more stable and is not easy to damage;
5. the response speed is faster than that of the power quality controller with the programmable control device, because the inductance-capacitance current in the controller is generated based on the instant establishment of the physical field, and calculation and control processes are not needed.
Drawings
Fig. 1 is a circuit diagram of an electromagnetic power quality unified controller according to an embodiment of the present invention.
Fig. 2 is a plot of the voltammetric characteristics of a pressure sensitive inductor.
Fig. 3 is an equivalent topology diagram of the controller circuit diagram shown in fig. 1.
Fig. 4 is a voltage-sensitive inductor design volt-ampere curve according to an embodiment of the present invention.
Fig. 5 is a graph of voltage sag suppressing waveform versus the controller of the present invention according to an embodiment of the present invention.
Fig. 6 is a diagram of the harmonic rejection effect of the controller of the present invention, according to one embodiment of the present invention.
Fig. 7 is an effect of the controller of the present invention balancing a three-phase unbalanced load according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a circuit topology of an electromagnetic power quality unified controller. As shown in fig. 1, all the constituent components of the controller are enclosed in a case. The input of the controller is connected with a three-phase alternating current power supply of the power grid, the power supply is introduced into a busbar in the box, and the power supply voltage is 380V or 10kV generally. The output of the controller is led out by a bus bar in the box and is also three-phase alternating current, and the output voltage is the rated voltage of the load. The neutral point of the controller is also led out from the output end, which is directly connected with the load.
The controller comprises a series inductor, a filter, a voltage sensitive inductor and a grounding transformer. The filter serves two purposes: odd harmonics are filtered out and capacitive currents are provided. The filter may be a C-type filter, but is not limited thereto, as long as the above two uses can be achieved. The filter comprises a low-voltage three-phase parallel capacitor, a filter capacitor, a resistor and a filter reactance. The grounding transformer provides neutral point extraction for the output terminal. Two groups of pressure sensitive inductors connected in series on the three phases are connected in parallel and used for providing inductive current. The voltage-sensitive inductor uses the nonlinear characteristic of ferromagnetic materials, the volt-ampere characteristic curve of which is shown in figure 2, the abscissa is the current or magnetic field intensity, and the ordinate is the voltage or magnetic induction intensity. When the voltage is very small, the current is almost zero, the current is rapidly increased after the voltage is increased, the pressure-sensitive inductance core is gradually saturated, and when the voltage is increased to the rated voltage, even if the voltage is continuously increased, the current of the pressure-sensitive inductance is basically unchanged, and the pressure-sensitive inductance is completely in a deep saturation state. The pressure-sensitive inductor used in the invention needs to ensure that when in design: when the voltage at the two ends is lower than the minimum user required voltage of the rated voltage, the output current is 0, and when the voltage at the two ends is higher than the maximum voltage specified by the user, the rated current is output twice. The rated capacitive current of the filter is equal to the rated inductive output current of the pressure sensitive inductor.
Fig. 3 is an equivalent topology structure diagram of the circuit diagram of the electromagnetic power quality unifying controller shown in fig. 1. For convenience of explanation, let the input side series three-phase inductance value be L 1 The filter is simplified to LC filterWave branch circuit, power supply voltage is set as U 1 (typically 380V or 10kV, in this case 380V), the load voltage is set to U 2 (rated load voltage is 380V), inductance L 1 Is set to DeltaU, flows through L 1 The current of (1) is set to I 1 The current flowing through the LC filter is set to I LC The current flowing through the voltage-sensitive inductor is set as I L The user requires the power supply voltage of the load to be not lower than 0.95 times rated voltage and not higher than 1.05 times rated voltage.
As mentioned above, the controller has special parameter design requirements, and needs to ensure that: the filter can filter odd harmonics, and the rated output capacitance current of the filter is equal to the rated current of the pressure-sensitive inductor; the voltage across the voltage-sensitive inductor is lower than 95% of the rated voltage, the output current is 0, and when the voltage across the inductor is higher than 105% of the rated voltage, twice the rated current is output, as shown in fig. 4.
The voltage stabilizing method based on the controller of the invention can be divided into the following three cases for discussion and explanation:
1. when the load voltage U 2 Is equal to the supply voltage U 1 I when no voltage fluctuation occurs LC =I L At this time, the capacitance current and the inductance
The currents cancel each other, which is equivalent to that the load is directly connected to the power supply side, and the normal operation of the load is not affected;
2. when the load voltage U 2 Less than the user requirement U 1 At minimum (i.e. grid voltage decrease), e.g. U 2 <0.95U 1 At this time
I LC =0.95I n ,I n For rated current, the voltage-sensitive inductance L 2 Make I due to its own characteristics L =0. The filter and the voltage sensitive inductor act in this case as providing 0.95I n So that U 2 =U 1 +ΔU>U 1 Delta U is the voltage drop on the three-phase series voltage-sensitive inductor, which is equivalent to the improvement of the power grid voltage by the electromagnetic power quality unified controller when the power grid voltage is reduced, and the guarantee of the load voltage U 2 Is stable;
3. when the load voltage U 2 U greater than user's requirements 1 Maximum value(i.e. the voltage of the network rises), e.g. U 2 >1.05U 1 At this time
I LC =1.05I n The pressure sensitive inductor outputs inductive current I L =2I n The filter and pressure sensitive inductor combination now acts equivalently to provide 0.95I n So that U 2 =U 1 +ΔU<U 1 Delta U is the voltage drop on the three-phase series voltage-sensitive inductor, which is equivalent to the reduction of the power grid voltage by the electromagnetic power quality unified controller when the power grid voltage is increased, and ensures the load voltage U 2 Is stable.
From the above three cases can be summarized: when the power grid voltage is the same as the load voltage, the special parameter design of the controller enables the controller to be in an off-line state automatically without any compensation; when the power grid voltage fluctuates within the design range, the special voltage stabilizing method of the controller can automatically perform corresponding compensation, and the stability of the power supply at the load side is ensured. In addition, the filter in the controller also ensures the control of harmonic pollution.
The measured voltages in a 380V load system are shown in table 1:
table 1 actual measurement values of the voltage stabilizing effect of 380V load
The invention can effectively inhibit voltage sag, such as 380V load system, when the power supply voltage is 0.7 times of rated voltage, the invention can effectively stabilize load voltage above 0.95 times of rated voltage, and the power supply voltage and load voltage waveform curve pair is as shown in figure 5.
In addition, the invention can effectively inhibit the influence of harmonic waves generated by the load on the power grid, the harmonic wave inhibition effect is shown in fig. 6, the load is a rectifying load, the total current harmonic distortion rate is 27.2%, the load voltage distortion rate is 4.5%, the current distortion rate at the power grid side is 1.8% after the isolation by the controller of the invention, and the voltage distortion rate is 0.15%.
The invention can also effectively improve the three-phase unbalanced current. The improvement effect is shown in fig. 7, the output side is connected to the single-phase variable load, the waveform of the input side power grid is detected, the three-phase imbalance condition of the input side power grid is obviously improved, the zero sequence current is zero, and the negative sequence current is reduced by about 85%. The upper graph in fig. 7 shows single-phase load current, and the lower graph shows three-phase input current.
Claims (7)
1. The utility model provides an electromagnetic type electric energy quality unified controller which characterized in that, the controller is input and is exported three-phase alternating current, and its output side is connected with the ground connection transformer that provides the neutral point for the output and draws forth, and the input side is connected with three-phase inductance, filters odd harmonic and provides the filter of capacitive current and provides the pressure sensitive inductance of inductor current, under the capacitive current of filter and the inductor current composition effect of pressure sensitive inductance, when grid voltage is the same with the load voltage, the controller is in the off-line state and does not carry out the compensation automatically, when the grid voltage is undulant in the design scope, the controller carries out the compensation automatically and guarantees that load side power is stable.
2. The electromagnetic power quality unifying controller of claim 1, wherein the rated capacitive current of the filter is equal to the rated inductive output current of the pressure sensitive inductor.
3. The unified controller of electromagnetic power quality according to claim 2 wherein the output inductor current is 0 when the voltage across the voltage-sensitive inductor is below the minimum user-required voltage for the nominal voltage, and outputs twice the nominal current when the voltage across the voltage-sensitive inductor is above the user-specified maximum voltage.
4. The unified power quality controller according to claim 3 wherein two sets of the voltage sensitive inductors in series on three phases are connected in parallel with each other.
5. The electromagnetic power quality control unit according to claim 3, wherein when the load voltage is equal to the grid voltage, the capacitive current and the inductive current cancel each other, so that the load is directly connected to the power source side.
6. The unified controller of electromagnetic power quality according to claim 3 wherein the filter provides capacitive current to boost the grid voltage and ensure a smooth load voltage when the load voltage is less than the minimum user required voltage of the nominal voltage.
7. The unified controller of claim 3, wherein when the load voltage is greater than a user specified maximum voltage, the capacitive current provided by the filter and the inductive current provided by the voltage-sensitive inductor combine to reduce the grid voltage, thereby ensuring the stability of the load voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311087733.9A CN116826761B (en) | 2023-08-28 | 2023-08-28 | Electromagnetic type electric energy quality unified controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311087733.9A CN116826761B (en) | 2023-08-28 | 2023-08-28 | Electromagnetic type electric energy quality unified controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116826761A true CN116826761A (en) | 2023-09-29 |
| CN116826761B CN116826761B (en) | 2023-11-28 |
Family
ID=88116975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311087733.9A Active CN116826761B (en) | 2023-08-28 | 2023-08-28 | Electromagnetic type electric energy quality unified controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116826761B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117477754A (en) * | 2023-12-28 | 2024-01-30 | 武汉中楚柏泰智能科技有限公司 | Working mode switching method and system for electromagnetic type power quality unified controller |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691626A (en) * | 1995-06-07 | 1997-11-25 | General Electric Company | Active damping control for active power filter |
| US20110121774A1 (en) * | 2008-05-15 | 2011-05-26 | Merstech Inc. | Alternating voltage control apparatus |
| CN103532151A (en) * | 2013-09-30 | 2014-01-22 | 广西电网公司河池供电局 | Multi-side voltage reactive power coordination optimal control system for transformer substation |
| US20160301303A1 (en) * | 2015-04-07 | 2016-10-13 | Virginia Tech Intellectual Properties, Inc. | Inverse Charge Current Mode (IQCM) Control for Power Converter |
| CN113872201A (en) * | 2021-10-25 | 2021-12-31 | 华瑞清能(北京)电力电子技术有限公司 | Join in marriage net side electric energy quality and synthesize and administer and energy-conserving increase device |
| CN116436287A (en) * | 2023-04-27 | 2023-07-14 | 重庆线艺嘉电子有限公司 | Voltage and current self-balancing method for staggered parallel three-level DCDC converter |
-
2023
- 2023-08-28 CN CN202311087733.9A patent/CN116826761B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691626A (en) * | 1995-06-07 | 1997-11-25 | General Electric Company | Active damping control for active power filter |
| US20110121774A1 (en) * | 2008-05-15 | 2011-05-26 | Merstech Inc. | Alternating voltage control apparatus |
| CN103532151A (en) * | 2013-09-30 | 2014-01-22 | 广西电网公司河池供电局 | Multi-side voltage reactive power coordination optimal control system for transformer substation |
| US20160301303A1 (en) * | 2015-04-07 | 2016-10-13 | Virginia Tech Intellectual Properties, Inc. | Inverse Charge Current Mode (IQCM) Control for Power Converter |
| CN113872201A (en) * | 2021-10-25 | 2021-12-31 | 华瑞清能(北京)电力电子技术有限公司 | Join in marriage net side electric energy quality and synthesize and administer and energy-conserving increase device |
| CN116436287A (en) * | 2023-04-27 | 2023-07-14 | 重庆线艺嘉电子有限公司 | Voltage and current self-balancing method for staggered parallel three-level DCDC converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117477754A (en) * | 2023-12-28 | 2024-01-30 | 武汉中楚柏泰智能科技有限公司 | Working mode switching method and system for electromagnetic type power quality unified controller |
| CN117477754B (en) * | 2023-12-28 | 2024-05-07 | 武汉中楚柏泰智能科技有限公司 | Working mode switching method and system for electromagnetic type power quality unified controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116826761B (en) | 2023-11-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jintakosonwit et al. | Implementation and performance of automatic gain adjustment in a shunt-active filter for harmonic damping throughout a power distribution system | |
| US7453331B2 (en) | Polyphase line filter | |
| RU2510556C1 (en) | Static reactive power compensator | |
| CN116826761B (en) | Electromagnetic type electric energy quality unified controller | |
| Baitha et al. | A comparative analysis of passive filters for power quality improvement | |
| US20100327823A1 (en) | Reactive power compensation circuit | |
| CN112054537B (en) | Control method of active filter for simultaneously compensating reactive power and controlling harmonic wave | |
| Guo et al. | Analysis and design of output LC filter system for dynamic voltage restorer | |
| CN104617580A (en) | Resonant type current limiting system and control method thereof | |
| CN210839320U (en) | LCLC type passive damping circuit, single-phase and three-phase grid-connected inverter system | |
| CN201001042Y (en) | Electric energy quality comprehensive controller for low-voltage distribution system | |
| Arulkumar et al. | Design of optimal LLCL filter with an improved control strategy for single phase grid connected PV inverter | |
| Dhaneria et al. | Design of AC side filter for grid tied solar inverter | |
| CN109361227A (en) | A kind of system based on LADRC optimization inverter power quality | |
| CN202026091U (en) | Nonresonant zero-sequence filtering device based on magnetic flux compensation | |
| CN205565730U (en) | Automatic transfer and hold pressure regulating distribution transformer low pressure system energy saving equipment | |
| CN112670064B (en) | Energy-saving filtering type power transformer | |
| Haghbin et al. | An LCL filter with an active compensation for a fast charger station | |
| CN204391749U (en) | Resonant mode current limiting system | |
| Deaconu et al. | Study, design and industrial implementation of capacitive power factor controller for large load fluctuations in steel industry | |
| RU183616U1 (en) | THREE PHASE CONTROLLED BYPASS REACTOR - STATIC REACTIVE POWER COMPENSATOR | |
| Gumilar et al. | Influence of Detuned Reactor Placement to Power Quality Enhancement in Industrial Customers Distribution Network | |
| CN204809839U (en) | Electric leakage circuit breaker | |
| Chingale et al. | Harmonic filter design for line start permanent magnet synchronous motor | |
| CN110635483A (en) | Novel adjustable filter structure of distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |