CN211955674U - Load device applied to electric energy quality control device - Google Patents
Load device applied to electric energy quality control device Download PDFInfo
- Publication number
- CN211955674U CN211955674U CN201921859231.2U CN201921859231U CN211955674U CN 211955674 U CN211955674 U CN 211955674U CN 201921859231 U CN201921859231 U CN 201921859231U CN 211955674 U CN211955674 U CN 211955674U
- Authority
- CN
- China
- Prior art keywords
- active power
- power filter
- filter
- load device
- electric energy
- 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.)
- Active
Links
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model belongs to the technical field of the electric energy is administered, concretely relates to be applied to load device that electric energy quality administered device. The device comprises a first active power filter, a second active power filter and an isolation transformer, wherein the direct current sides of the first active power filter and the second active power filter are connected, the alternating current side of the first active power filter is used for being connected with a power grid through the isolation transformer, and the alternating current side of the second active power filter is used for being connected with the power grid; the filter control module is connected with the first active power filter and the second active power filter in a control mode. This load device can produce active, idle, harmonic and unbalanced current through setting up different output current to need not multiple load device, only can realize the test and the debugging to various types of electric energy quality improvement device through this load device, with the compensation effect that detects electric energy quality improvement device.
Description
Technical Field
The utility model belongs to the technical field of the electric energy is administered, concretely relates to be applied to load device that electric energy quality administered device.
Background
The wide application of power electronic equipment in power systems such as factory power supply, civil residence and urban power supply increases a great deal of nonlinear, fluctuating and asymmetric loads, and causes energy quality pollution such as voltage fluctuation, low power factor, three-phase imbalance and harmonic wave, etc. to be serious. With the concern of people gradually arising from the problem of power quality, various power quality management devices are widely used, and the corresponding power quality management devices include a reactive power compensation device, a three-phase unbalance compensation device, a harmonic compensation device and the like.
In order to test the power quality control devices, the power quality control devices need to be provided with corresponding loads for detecting the compensation effects of the power quality control devices. For example, for a reactive power compensation device, two sets of reactive power compensation devices are generally purchased and adopt a back-to-back mode, wherein one set of reactive power compensation device is used as a load, and the other set of reactive power compensation device is used for compensation; for the unbalance compensation device, a resistance box is generally needed; for reactive compensation devices, capacitive loads are often required. That is, different loads need to be configured for different power quality control devices, so when testing different power quality control devices, the loads need to be replaced, rewiring is performed, and the testing efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model provides a be applied to load device that power quality administers device for solve among the prior art different power quality administers the problem that the efficiency of software testing that the device need dispose different loads and cause is low.
For solving the technical problem, the technical scheme and beneficial effect of the utility model are that:
the utility model discloses a load device applied to electric energy quality control device, including first active power filter, second active power filter and isolation transformer, the direct current side of first active power filter and second active power filter links to each other, and the alternating current side of first active power filter is used for connecting the electric wire netting through isolation transformer, and the alternating current side of second active power filter is used for connecting the electric wire netting; the filter control module is connected with the first active power filter and the second active power filter in a control mode.
The beneficial effects are as follows: the utility model discloses a load device uses two active power filter's direct current side to connect back to back, and one of them active power filter's alternating current side direct current connects the electric wire netting, and another active power filter's alternating current side is through isolation transformer connection electric wire netting. This load device can produce active, idle, harmonic and unbalanced current through setting up different output current to need not multiple load device, only can realize the test and the debugging to various types of electric energy quality improvement device through this load device, with the compensation effect that detects electric energy quality improvement device. Moreover, the load device is energy-saving, high in feedback power factor of the power grid, high in overall efficiency, strong in anti-interference capability and high in reliability due to the fact that the load device is provided with the transformer for isolation.
Furthermore, the filter control module comprises two controllers, namely a first controller and a second controller, wherein the first controller is used for outputting a control signal to control and connect a switch tube in the first active power filter, and the second controller is used for outputting a control signal to control and connect a switch tube in the second active power filter.
Furthermore, the filter control module also comprises a communication controller, the communication controller is in communication connection with the filter control module, and the communication controller is also provided with a wireless communication interface.
Drawings
Fig. 1 is a circuit diagram of a load device applied to a power quality management device of the present invention;
fig. 2 is a circuit diagram of an active power filter;
FIG. 3 is a block diagram of a control strategy for # 1 APF;
fig. 4 is a block diagram of a control strategy for # 2 APF.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
Load device embodiment:
this embodiment provides a load device for power quality governance device, and this load device is used for connecting the electric wire netting, and through being connected power quality governance device between load device and the electric wire netting, alright realize the test to power quality governance device. The load device will be described in detail below.
The load device is designed aiming at theoretical research, device inspection experiment, production debugging and aging of an electric energy quality control device, and comprises two Active Power Filters (APFs), a main circuit schematic diagram of the load device is shown in figure 2, the two active power filters are respectively a first active power filter 1# APF and a second active power filter 2# APF, and the load device further comprises an isolation transformer, a filter control module and a communication controller.
The first active power filter 1# APF and the second active power filter 2# APF are connected back to back, and the direct current sides of the two active power filters are connected; the ac side of the second active power filter 2# APF is directly connected to the three-phase four-wire grid (U, V, W and N); the ac side of the first active power filter 1# APF is connected to the grid through an isolation transformer.
In order to control the switching tubes in the first active power filter 1# APF and the second active power filter 2# APF, the filter control module in the load device includes two controllers (not shown in fig. 1), which are respectively a first controller and a second controller, the first controller outputs a PWM wave to control the switching tubes in the first active power filter 1# APF to be turned on and off, and the second controller outputs a PWM wave to control the switching tubes in the second active power filter 2# APF to be turned on and off.
For convenience of description, in fig. 2, the voltage between DC + and N is a positive bus voltage Udc1, the voltage between DC-and N is a negative bus voltage Udc2, the voltage between DC + and DC-is a direct current bus voltage Udc, the direct current bus reference voltage is Udcref, the device actually outputs three-phase currents of Ica, Icb and Icc, the command current signals are Irefa, Irefb and Irefc, and the grid voltage is usaa, Usb and Usc.
The first active power filter 1# APF mainly serves as voltage stabilization and neutral point balance control. Fig. 3 shows a control strategy diagram, and the specific control strategy is as follows: the voltage-stabilizing ring is used for stabilizing the direct-current bus voltage Udc, and the voltage-equalizing ring is used for neutral point balance control to realize the balance of the positive bus voltage Udc1 and the negative bus voltage Udc 2. In a voltage stabilizing loop, comparing a total voltage Udc reference voltage Udcref at a direct current side, multiplying an error signal by a sinusoidal signal (a PLL phase-locked circuit output signal) which is synchronous with each phase of a power grid after passing through a PI (proportional integral) regulator, and superposing the error signal on an instruction current as an active component for regulating the stability of the direct current bus voltage; in the voltage equalizing ring, a difference signal (Udc2-Udc1) of positive and negative bus voltages passes through a PI regulator and then is superposed on a command current as a zero sequence component, the difference is made with the current (Ica, Icb and Icc) actually output by the device and sent to a PI controller, and a PWM driving signal is generated by an SPWM module to drive a switching tube to work.
The second active power filter 2# APF is used to output the load current. Fig. 4 shows a control strategy diagram, and the specific control strategy is as follows: comprises a current inner ring and a voltage outer ring. The current inner loop is composed of a PI controller and a PR (proportional resonance) controller and is used for ensuring the dynamic performance and the steady-state compensation precision of the system. The voltage outer ring is used for power grid voltage feedforward (Usa, Usb and Usc), the dynamic performance of the system is improved, and the impact of power grid voltage fluctuation on the direct current bus voltage and the influence of output precision are reduced. The command current of the device is used as given current signals (Irefa, Irefb and Irefc), the current signal actually output by the device is used as feedback signals (Ica, Icb and Icc), the difference between the given current and the feedback signals is sent to a current inner loop controller (PI + PR), a PWM driving signal is generated by an SPWM module to drive a switching tube to work, and the purpose that the device actually outputs current tracking command current is achieved.
It should be noted that the control strategies executed by the first controller and the second controller are both existing control strategies of the APF.
Through above-mentioned structure, this load device can produce active, idle, harmonic and unbalanced current through setting up different output current. Moreover, the load device is energy-saving, high in feedback power factor of the power grid, high in overall efficiency, strong in anti-interference capability and high in reliability due to the fact that the load device is provided with the transformer for isolation.
Moreover, the load device also comprises a communication controller, the communication controller realizes data interaction with the first controller through RS485 and also realizes data interaction with the second controller through RS485, and the communication controller is provided with a wireless communication interface and can realize data interaction with a mobile phone, an iPad, a notebook computer and the like, so that the devices can carry out web access or APP operation, data display and parameter setting are realized, and powerful data information exchange and communication management functions are realized.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (3)
1. A load device applied to an electric energy quality control device is characterized by comprising a first active power filter, a second active power filter and an isolation transformer, wherein the direct current sides of the first active power filter and the second active power filter are connected, the alternating current side of the first active power filter is used for being connected with a power grid through the isolation transformer, and the alternating current side of the second active power filter is used for being connected with the power grid; the filter control module is connected with the first active power filter and the second active power filter in a control mode.
2. The load device applied to the electric energy quality governance device according to claim 1, wherein the filter control module comprises two controllers, namely a first controller and a second controller, the first controller is used for outputting a control signal to control a switch tube connected to the first active power filter, and the second controller is used for outputting a control signal to control a switch tube connected to the second active power filter.
3. The load device applied to the power quality management device according to claim 1, further comprising a communication controller, wherein the communication controller is in communication connection with the filter control module, and the communication controller further comprises a wireless communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921859231.2U CN211955674U (en) | 2019-10-31 | 2019-10-31 | Load device applied to electric energy quality control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921859231.2U CN211955674U (en) | 2019-10-31 | 2019-10-31 | Load device applied to electric energy quality control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211955674U true CN211955674U (en) | 2020-11-17 |
Family
ID=73166387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921859231.2U Active CN211955674U (en) | 2019-10-31 | 2019-10-31 | Load device applied to electric energy quality control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211955674U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110850202A (en) * | 2019-10-31 | 2020-02-28 | 许继电源有限公司 | Load device applied to electric energy quality treatment device |
-
2019
- 2019-10-31 CN CN201921859231.2U patent/CN211955674U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110850202A (en) * | 2019-10-31 | 2020-02-28 | 许继电源有限公司 | Load device applied to electric energy quality treatment device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103023128B (en) | A kind of power-supply system for UPS server | |
| US8824169B2 (en) | Multiple inverter and active power filter system | |
| CN102790422B (en) | A kind of UPS charging module device and control method thereof | |
| CN105119290B (en) | A kind of power compensating system and control method of uninterruptible power supply | |
| CN105071403A (en) | Reactive compensation device based on double H-bridge modular multilevel topology and control method | |
| CN103606926A (en) | High-capacity unified power quality conditioner based on chain structure and control method thereof | |
| CN101291057B (en) | Dynamic voltage compensator adopting 3 phase structure | |
| CN101950960A (en) | Control method of DC bus voltage of cascading multi-level power quality conditioners | |
| CN201061144Y (en) | Dynamic voltage compensator using three single-phase structure | |
| CN106301055A (en) | Inverter parallel loop current suppression system based on virtual synchronous generator control strategy | |
| Merai et al. | Grid connected converters as reactive power ancillary service providers: Technical analysis for minimum required DC-link voltage | |
| CN211955674U (en) | Load device applied to electric energy quality control device | |
| CN103248210A (en) | Power synchronous control method for reducing secondary fluctuations of direct current side voltage | |
| CN104934995A (en) | UPQC with uninterrupted power source function | |
| KR20100136086A (en) | Uninterruptible dc power supply system | |
| CN102723717A (en) | Active power filter structure for zero current detection and control method thereof | |
| CN110850202A (en) | Load device applied to electric energy quality treatment device | |
| CN105119317A (en) | Method utilizing PV power generation device for compensation | |
| CN204858577U (en) | Reactive power compensator based on two many level of H bridge modularization transverters | |
| CN202696155U (en) | FPGA-based chain-type STATCOM carrier phase-shifting pulse width modulation device | |
| CN207664638U (en) | A kind of grid-connected VSG devices of distributed generation resource | |
| CN116191482A (en) | Control system and method for unbalanced load of three-level voltage restorer | |
| US11616388B1 (en) | Uninterruptible power apparatus with function of forced disconnection path and method of forcing disconnection path thereof | |
| CN202712946U (en) | UPS charging module device | |
| Kikuchi et al. | Complementary half controlled three phase PWM boost rectifier for multi-DC-link applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |