CN111856094A - Harmonic current generating device and method for controlling harmonic current stepless linear output - Google Patents
Harmonic current generating device and method for controlling harmonic current stepless linear output Download PDFInfo
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Abstract
The invention provides a harmonic current generating device and also provides a method for controlling the stepless linear output of harmonic current, which realizes the simulation of harmonic current and the control of the linear dynamic stepless output of the harmonic current, has low energy consumption and good energy-saving effect and comprises the following steps: the load simulation unit is connected with a power grid and used for simulating and restoring various on-site power load working conditions; the sampling unit is connected with the power grid and the load simulation unit and is used for sampling the load simulation unit; the harmonic current stepless dynamic generation unit is connected with the sampling unit and the load simulation unit, calculates and obtains load harmonic current according to current sampling data obtained by the sampling unit, and outputs supplementary harmonic current to the load simulation unit according to the difference value of the load harmonic current and a target harmonic current value; the main control unit is connected with the harmonic current stepless dynamic generation unit and is used for sending a target harmonic current value at the current moment to the harmonic current stepless dynamic generation unit in real time.
Description
Technical Field
The invention relates to the technical field of harmonic sources, in particular to a harmonic current generating device and a method for controlling the stepless linear output of harmonic current.
Background
The traditional method for obtaining the harmonic current source is to control a conduction angle to switch a resistor through a silicon controlled rectifier (thyristor). The method has the defects that harmonic components are uncontrollable under different conduction angles, partial harmonic currents are possibly lost, the magnitude of each harmonic current cannot be quantitatively controlled, the frequency of the harmonic waves injected into a system cannot be accurately controlled, and the like. The current methods for obtaining harmonic currents also have the following major drawbacks: 1. the output harmonic current does not have the performance of stepless linear dynamic output, and the debugging and the use can be changed along with the voltage of a power grid, the temperature of a device and the conduction angle; 2. the harmonic current cannot be automatically stabilized for a long time by a manual angle adjusting mode and manual start and stop, and the upper computer control of automatic control is not available; 3. the heating and the loss are large when the same harmonic current is sent, the harmonic voltage is relatively large, and the risk of damaging other instruments, relay protection instruments and other equipment in the power grid is relatively large during operation; 4. there is no design of load simulation unit for simulating and restoring various working conditions on site.
Disclosure of Invention
Aiming at the problems, the invention provides a harmonic current generating device and a method for controlling the harmonic current stepless linear output of the harmonic current generating device, so that the simulation of the harmonic current and the control of the harmonic current linear dynamic stepless output are realized, the energy consumption is low, the energy-saving effect is good, and the function of simulating and restoring various working conditions on site is realized.
The technical scheme is as follows: a harmonic current generating device, comprising:
the load simulation unit is connected with a power grid and used for simulating and restoring various on-site power load working conditions;
the sampling unit is connected between the power grid and the load simulation unit and is used for sampling the load simulation unit;
the harmonic current stepless dynamic generation unit is respectively connected with the sampling unit and the load simulation unit, calculates to obtain load harmonic current according to current sampling data obtained by the sampling unit, and outputs supplementary harmonic current to the load simulation unit according to the difference value between the load harmonic current and a target harmonic current value;
and the master control unit is connected with the harmonic current stepless dynamic generation unit and is used for transmitting the target harmonic current value at the current moment to the harmonic current stepless dynamic generation unit in real time.
Further, the sampling unit comprises a current sampling transformer.
Further, the load simulation unit comprises a rectification module respectively connected with a three-phase power supply of a power grid, and a load resistance module connected with the rectification module.
Further, the rectifier module includes diodes D5 and D6 connected in series, diodes D5 and D6 are also connected in parallel with diodes D2 and D1 connected in series, and diodes D3 and D4 connected in series, phase a of the three-phase power supply is connected between diodes D5 and D6 after being connected to switch MCA, phase B of the three-phase power supply is connected between diodes D1 and D2 after being connected to switch MCB, phase C of the three-phase power supply is connected between diodes D3 and D4 after being connected to switch MCC, and the load resistance module includes diodes D5 and D6 connected in parallel: the resistor R1 and the resistor R1 are also connected with a contactor MC1 in series; the resistor R2 and the resistor R2 are also connected with a contactor MC2 in series, and the resistor R2 is also connected with the resistor R3 in parallel; the resistor R4 and the resistor R4 are also connected in series with the contactor MC3, and the resistor R4 is also connected in parallel with the resistor R5 and the resistor R6.
Further, the harmonic current stepless dynamic generation unit comprises:
and the control module is connected to the sampling unit and the main control unit, acquires load harmonic current according to current sampling data from the sampling unit, receives a target harmonic current value sent by the main control unit at the current moment to obtain a harmonic current difference value, and outputs a PWM (pulse width modulation) control signal to control the supplementary harmonic current output by the power output module according to the harmonic current difference value.
Furthermore, the harmonic current stepless dynamic generation unit further comprises a filtering module, the filtering module comprises an LCL filtering circuit, the output end of the power output module is connected to the input end of the filtering module, and the output end of the filtering module is connected to a power grid and used for filtering the IGBT switching frequency harmonic in the output current of the power output module.
Further, the control module includes:
the AD sampling chip is used for matching with the sampling unit to perform real-time synchronous sampling;
the FPGA chip is used for controlling the AD sampling chip to perform synchronous sampling;
and the DSP chip is used for calculating a harmonic current difference value and outputting a PWM control signal according to the harmonic current difference value to control the supplementary harmonic current output by the power output module.
Furthermore, hardware circuits of all units of the harmonic current generation device are respectively arranged in drawer type boxes, the drawer type boxes are installed in a load cabinet, and rollers are arranged at the lower end of the load cabinet.
The method for the harmonic current stepless linear output of the harmonic current generating device is characterized by comprising the following steps of:
the method comprises the steps that a main control system reads system setting parameters and configures the relation between the magnitude of harmonic current to be generated and time, a load simulation unit is connected with a power grid, the main control unit sends a target harmonic current value at the current moment to a harmonic current stepless dynamic generation unit in a communication mode, a sampling unit samples the load simulation unit and sends sampling data to the harmonic current stepless dynamic generation unit, the harmonic current stepless dynamic generation unit obtains load harmonic current according to current sampling data from the sampling unit, and supplementary harmonic current is output to the load simulation unit according to the difference value between the load harmonic current and the target harmonic current value until the set time of the harmonic current to be generated is finished.
Furthermore, a control module of the harmonic current stepless dynamic generation unit obtains the order and the size of the load harmonic current through a sliding window iterative FFT detection algorithm according to current sampling data from the sampling unit, communicates with the main control unit, obtains a target harmonic current value and calculates a total harmonic current difference value, then calculates a linear coefficient of each harmonic current difference, and sends a PWM signal corresponding to a pulse width to control the power output module to output a supplementary harmonic current and perform PI closed-loop control.
The harmonic current generating device of the invention can replace the existing traditional harmonic current source equipment for production test, provides large-capacity controllable harmonic current for reactive compensation, harmonic filtering products or other equipment connected to a power grid, has the function of restoring working conditions of the simulation equipment after on-site power supply, can linearly and steplessly amplify the harmonic current in the load simulation unit in real time without amplifying active current, realizes the simulation of the harmonic current of various loads and the control of linear dynamic stepless output of the harmonic current, reduces the energy consumption by times compared with the energy consumption of the on-site load system of the same type, realizes the doubling energy-saving effect, greatly improves the key performance of the system and the use safety and the automation degree of the system, creates a modularized design, can obtain the restoration simulation of various different types of on-site working conditions by replacing the load simulation unit, and the total cost of the system is lower than that of a market harmonic current source.
Drawings
FIG. 1 is a block diagram of a harmonic current generator according to the present invention;
FIG. 2 is a circuit diagram of a load simulation unit according to the present invention;
FIG. 3 is a block diagram of the harmonic current stepless dynamic generation unit of the present invention;
FIG. 4 is a phase current waveform of a load simulation unit of the present invention;
fig. 5 is a harmonic current waveform of the load simulation unit of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention relates to a harmonic current generating device, which is a special harmonic current source device capable of providing large-capacity controllable harmonic current for reactive compensation, harmonic filtering products or other devices accessed to a power grid and reducing working conditions of analog equipment after field power supply, and can meet the production detection, product output capacity and compensation effect detection of manufacturers such as reactors, capacitors, compensation controllers, filters, complete cabinets and the like, or the working performance detection in a harmonic environment when the devices are accessed to the power grid, or practical values such as factory aging experiments and the like, wherein the common capacity of the devices is 100-600A (shown in figure 1), and the device comprises:
the load simulation unit 1 is connected with the power grid 2 and used for simulating and restoring various on-site power load working conditions;
the sampling unit 3 is connected between the power grid 2 and the load simulation unit and is used for sampling the load simulation unit 1;
the harmonic current stepless dynamic generation unit 4 is connected with the sampling unit 3 and the load simulation unit 1 respectively, the harmonic current stepless dynamic generation unit 4 calculates and obtains load harmonic current according to current sampling data obtained by the sampling unit 3, and outputs supplementary harmonic current to the load simulation unit 1 according to the difference value between the load harmonic current and a target harmonic current value;
the main control unit 5 is connected with the harmonic current stepless dynamic generation unit 4 and used for sending a target harmonic current value at the current moment to the harmonic current stepless dynamic generation unit 4 in real time, the main control unit controls the harmonic current stepless dynamic generation unit 4 to start and stop through communication, and after the starting, the instantaneous value of the relation curve between the harmonic current and the time, which is calculated by a customer, is continuously sent to the harmonic current stepless dynamic generation unit 4 at the speed of 57600BPS through communication.
In the harmonic current generating device, the load simulation unit can be replaced according to the load to be simulated, the load simulation unit can be replaced according to different types of field working conditions, the reduction simulation of the different types of field working conditions can be obtained by replacing the load simulation unit, the circuit components of the load simulation unit adopt drawer type box bodies, 1 or more drawer type box bodies are installed in the load cabinet with wheels in a layered mode, the aviation plug is quickly connected into the system, the output capacity is increased by increasing the parallel connection quantity, the hardware capacity is changed by the mature parallel connection expansion of the modules, the modularization degree of the system is improved, the replacement and maintenance are convenient, and the system cost is greatly reduced.
Specifically, in this embodiment, a typical load simulation unit is shown, which includes a rectification module connected to a three-phase power supply of a power grid, and a load resistance module connected to the rectification module;
as shown in fig. 2, the rectifier module includes series-connected diodes D5 and D6, diodes D5 and D6 are further connected in parallel with series-connected diodes D2 and D1, and series-connected diodes D3 and D4, a phase a of the three-phase power supply is connected between the diodes D5 and D6 after connecting to switch MCB, a phase B of the three-phase power supply is connected between the diodes D1 and D2 after connecting to switch MCB, a phase C of the three-phase power supply is connected between the diodes D3 and D4 after connecting to switch MCC, and the load resistance module includes diodes D5 and D6 connected in parallel: the resistor R1 and the resistor R1 are also connected with a contactor MC1 in series; the resistor R2 and the resistor R2 are also connected with a contactor MC2 in series, and the resistor R2 is also connected with the resistor R3 in parallel; the resistor R4 and the resistor R4 are further connected in series with the contactor MC3, the resistor R4 is further connected in parallel with the resistor R5 and the resistor R6, fig. 4 is a phase current waveform of the load simulation unit of the present invention, and fig. 5 is a harmonic current waveform of the load simulation unit of the present invention.
The load simulation unit in the embodiment sends out the harmonic current type of the load model required by a customer, and is innovative in that the capacity is only 10% -30% of the same kind of load on site, for example, 10% of the load is amplified by 9 times and added, so that total harmonic current of 10 times can be innovatively and lowly obtained, meanwhile, the 10% -30% of load is innovatively utilized to ensure that the system contains about 10% -30% of active current to ensure that the power factor and the harmonic content of a power grid are in a certain range, and the harmonic current type can be adjusted in 6 steps through the combination of the contactors MC1 to MC3 in the figure 2.
Specifically, in this embodiment, the sampling unit 3 employs a current sampling transformer, see fig. 3, and the harmonic current stepless dynamic generation unit 4 includes:
the power output module 402, the power output module 402 includes an IGBT inverter circuit for outputting a harmonic current;
And the filtering module 403, where the filtering module 403 includes an LCL filtering circuit, an output end of the power output module 402 is connected to an input end of the filtering module 403, and an output end of the filtering module 403 is connected to a power grid and is used to filter IGBT switching frequency harmonics in the output current of the power output module 402.
The current of the current sampling mutual inductor sampling load analog unit 1 of the sampling unit 3 is sent to an AD sampling chip, the control module 401 controls the AD sampling chip to sample synchronously through an FPGA chip, sampling data is calculated through a DSP chip, the magnitude of each time of harmonic current in the load is resolved by adopting a sliding window iterative FFT detection algorithm, meanwhile, the target harmonic current value at the current moment of the transmission from the main control unit 5 is received to obtain each harmonic current difference value, outputs PWM control signals according to the harmonic current difference value, drives the IGBT inverter circuit of the power output module 402 to generate each harmonic current, performs current PI closed-loop control, meanwhile, the DSP chip and the main control unit have a real-time communication protocol, the main control unit ensures that the current value of the total harmonic current curve which is in stepless change is sent out dynamically, through the division coordination of the two, the goal of sending out large-capacity harmonic current and linear dynamic stepless change is finally realized.
The use flow of the harmonic current generation device of the present invention is given below: firstly, a user determines a load simulation unit required by a test, a connection power cable of the load simulation unit is connected to a power grid connection terminal of a main cabinet, a product to be tested such as a reactive compensation capacitor and a tuning reactor thereof is connected to the power grid connection terminal, the control power is electrified after checking that the wiring of each unit and the wiring of the tested product are correct, stable and reliable, the harmonic current required to be output is configured in a main control unit according to the requirement, or the curve of the output magnitude of the required stepless linear harmonic current and the time is configured, the power is respectively electrified for the product to be tested and a harmonic current stepless dynamic generation unit, the harmonic current stepless dynamic generation unit is started to operate by the main control unit regularly or manually, then the load simulation unit is electrified, the equipment performs closed-loop current PI control according to the set total harmonic current magnitude to ensure the stable output of the set harmonic current or current curve, and stopping running after the timing or curve time is up, and finishing the experiment.
The harmonic current generating device of the invention innovatively realizes the reduction of the actual working condition environment of various on-site electric equipment and the linear stepless dynamic amplification (also can be used for reduction) of the harmonic current in the environment, and can also realize the requirement of a client on the development of an automatic test platform for remote digital real-time control through reserving a communication interface;
the harmonic current source device is simple and practical in structure, can provide production detection or aging of products such as reactive compensation products, harmonic compensation products and complete equipment for a reactor, a capacitor or filter manufacturer, a complete manufacturer and the like, uses the IGBT as a core power semiconductor of inverter inversion of a converter, replaces a mode of controlling a conduction angle of a silicon controlled rectifier (thyristor) semi-controlled semiconductor power device adopted by old harmonic source devices, adopts high-frequency PWM (pulse width modulation) digital modulation waves to control free output voltage and current of switch control equipment of the IGBT, and greatly improves the control performance and the switching efficiency of a switch.
In an embodiment of the present invention, there is further provided a method for controlling a harmonic current stepless linear output by using the harmonic current generating device, including the following steps:
the method comprises the steps that a main control system reads system setting parameters and configures the relation between the magnitude of harmonic current to be generated and time, a load simulation unit is connected with a three-phase power supply, the main control unit communicates and sends a target harmonic current value at the current moment to a harmonic current stepless dynamic generation unit, a sampling unit samples the load simulation unit and sends sampling data to the harmonic current stepless dynamic generation unit, the harmonic current stepless dynamic generation unit obtains load harmonic current according to current sampling data from the sampling unit, and supplementary harmonic current is output to the load simulation unit according to the difference value between the load harmonic current and the target harmonic current value until the set time of the harmonic current to be generated is finished.
Specifically, in the harmonic current stepless dynamic generation unit, a control module obtains the order and the size of load harmonic current through a sliding window iterative FFT detection algorithm according to current sampling data from a sampling unit, communicates with a main control unit, obtains a target harmonic current value and calculates a total harmonic current difference value, then calculates a linear coefficient of each harmonic current difference, and sends a PWM signal corresponding to a pulse width to control a power output module to output supplementary harmonic current and perform PI closed-loop control.
It will be understood by those skilled in the art that all or part of the method flows in the above embodiments may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the flows of the above embodiments of the methods. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A harmonic current generating device, comprising:
the load simulation unit is connected with a power grid and used for simulating and restoring various on-site power load working conditions;
the sampling unit is connected between the power grid and the load simulation unit and is used for sampling the load simulation unit;
the harmonic current stepless dynamic generation unit is respectively connected with the sampling unit and the load simulation unit, calculates to obtain load harmonic current according to current sampling data obtained by the sampling unit, and outputs supplementary harmonic current to the load simulation unit according to the difference value between the load harmonic current and a target harmonic current value;
and the master control unit is connected with the harmonic current stepless dynamic generation unit and is used for transmitting the target harmonic current value at the current moment to the harmonic current stepless dynamic generation unit in real time.
2. A harmonic current generating device according to claim 1, wherein: the sampling unit comprises a current sampling mutual inductor.
3. A harmonic current generating device according to claim 1, wherein: the load simulation unit comprises a rectification module and a load resistance module, wherein the rectification module is respectively connected with a three-phase power supply of a power grid, and the load resistance module is connected with the rectification module.
4. A harmonic current generating apparatus according to claim 3, wherein: the rectifying module comprises diodes D5 and D6 which are connected in series, the diodes D5 and D6 are also connected in parallel with D2 and D1 which are connected in series and D3 and D4 which are connected in series, a phase A of a three-phase power supply is connected between the diodes D5 and D6 after being connected with a switch MCB, a phase B of the three-phase power supply is connected between the diodes D1 and D2 after being connected with a switch MCB, a phase C of the three-phase power supply is connected between the diodes D3 and D4 after being connected with a switch MCC, and the load resistance module comprises the diodes D5 and D6 which are connected in parallel: the resistor R1 and the resistor R1 are also connected with a contactor MC1 in series; the resistor R2 and the resistor R2 are also connected with a contactor MC2 in series, and the resistor R2 is also connected with the resistor R3 in parallel; the resistor R4 and the resistor R4 are also connected in series with the contactor MC3, and the resistor R4 is also connected in parallel with the resistor R5 and the resistor R6.
5. A harmonic current generating device according to claim 1, wherein: the harmonic current stepless dynamic generation unit comprises:
the power output module comprises an IGBT inverter circuit and is used for outputting harmonic current;
and the control module is connected to the sampling unit and the main control unit, acquires load harmonic current according to current sampling data from the sampling unit, receives a target harmonic current value sent by the main control unit at the current moment to obtain a harmonic current difference value, and outputs a PWM (pulse width modulation) control signal to control the supplementary harmonic current output by the power output module according to the harmonic current difference value.
6. A harmonic current generating apparatus according to claim 5, wherein: the harmonic current stepless dynamic generation unit further comprises a filtering module, the filtering module comprises an LCL filtering circuit, the output end of the power output module is connected to the input end of the filtering module, and the output end of the filtering module 403 is connected to a power grid and used for filtering IGBT switching frequency harmonics in the output current of the power output module.
7. A harmonic current generating apparatus according to claim 5, wherein: the control module includes:
the AD sampling chip is used for matching with the sampling unit to perform real-time synchronous sampling;
the FPGA chip is used for controlling the AD sampling chip to perform synchronous sampling;
and the DSP chip is used for calculating a harmonic current difference value and outputting a PWM control signal according to the harmonic current difference value to control the supplementary harmonic current output by the power output module.
8. A harmonic current generating device according to claim 1, wherein: hardware circuits of all units of the harmonic current generating device are respectively arranged in a drawer type box body, the drawer type box body is installed in a load cabinet, and rollers are arranged at the lower end of the load cabinet.
9. A method of harmonic current stepless linear output of the harmonic current generation device according to claim 1, characterized by comprising the steps of:
the main control system reads system setting parameters and configures the relation between the harmonic current to be generated and time, the load simulation unit is connected to a power grid, the main control unit communicates and sends a target harmonic current value at the current moment to the harmonic current stepless dynamic generation unit, the sampling unit samples the load simulation unit and sends sampling data to the harmonic current stepless dynamic generation unit, the harmonic current stepless dynamic generation unit obtains load harmonic current according to current sampling data from the sampling unit, and supplements harmonic current to the load simulation unit according to the difference value between the load harmonic current and the target harmonic current value until the set time of the harmonic current to be generated is finished.
10. The method of the harmonic current stepless linear output of the harmonic current generating device according to claim 9, characterized in that: the control module of the harmonic current stepless dynamic generation unit obtains the order and the size of load harmonic current through a sliding window iterative FFT detection algorithm according to current sampling data from the sampling unit, communicates with the main control unit, obtains a target harmonic current value and calculates a total harmonic current difference value, then calculates a linear coefficient of each harmonic current difference value, and sends a PWM signal corresponding to a pulse width to control the power output module to output supplementary harmonic current and perform PI closed-loop control.
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| JP2014044188A (en) * | 2012-08-27 | 2014-03-13 | Tohoku Electric Power Co Inc | Harmonic measuring method and harmonic measuring apparatus |
| CN205377296U (en) * | 2015-12-25 | 2016-07-06 | 江苏华冠电器集团有限公司 | Active idle humorous carrier load generating device of low pressure |
| CN106526505A (en) * | 2016-10-14 | 2017-03-22 | 北京东方计量测试研究所 | Method and system for testing non-linear load capacity characteristic of alternating-current voltage-stabilized source |
| CN209117841U (en) * | 2018-10-23 | 2019-07-16 | 北京大华无线电仪器有限责任公司 | DC load is set to have the device of exchange load function |
| CN111200287A (en) * | 2018-11-16 | 2020-05-26 | 中国石油化工股份有限公司 | Appointed harmonic current injection device and harmonic current giving method thereof |
-
2020
- 2020-07-27 CN CN202010730860.6A patent/CN111856094A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014044188A (en) * | 2012-08-27 | 2014-03-13 | Tohoku Electric Power Co Inc | Harmonic measuring method and harmonic measuring apparatus |
| CN205377296U (en) * | 2015-12-25 | 2016-07-06 | 江苏华冠电器集团有限公司 | Active idle humorous carrier load generating device of low pressure |
| CN106526505A (en) * | 2016-10-14 | 2017-03-22 | 北京东方计量测试研究所 | Method and system for testing non-linear load capacity characteristic of alternating-current voltage-stabilized source |
| CN209117841U (en) * | 2018-10-23 | 2019-07-16 | 北京大华无线电仪器有限责任公司 | DC load is set to have the device of exchange load function |
| CN111200287A (en) * | 2018-11-16 | 2020-05-26 | 中国石油化工股份有限公司 | Appointed harmonic current injection device and harmonic current giving method thereof |
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