CN111934430A - Control system of active voltage quality adjusting device based on power electronics - Google Patents
Control system of active voltage quality adjusting device based on power electronics Download PDFInfo
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- CN111934430A CN111934430A CN202010786177.4A CN202010786177A CN111934430A CN 111934430 A CN111934430 A CN 111934430A CN 202010786177 A CN202010786177 A CN 202010786177A CN 111934430 A CN111934430 A CN 111934430A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- 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
- Y02E40/40—Arrangements for reducing harmonics
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a control system of an active voltage quality adjusting device based on power electronics, which comprises a voltage quality adjusting device, wherein the voltage quality adjusting device is connected with an FPGA module; the FPGA module is connected with the FPGA and the DSP module data buffer area through a data bus; the FPGA and DSP module data buffer area is connected with the data bus and the DSP module; the DSP module is connected with the upper computer through the Ethernet; the problem of prior art adopt to the control mode of power quality control device still single machine control mode, all data acquisition and data processing and the control command of issuing all rely on single controller to go on, this has data processing volume big, data delay etc. is solved.
Description
Technical Field
The invention belongs to the voltage quality control technology, and particularly relates to a control system of an active voltage quality adjusting device based on power electronics.
Background
The power electronic technology is a new electronic technology applied to the power field, namely a technology for converting and controlling electric energy by using power electronic devices (such as thyristors, GTOs, IGBTs and the like), and an electric energy quality comprehensive treatment device is developed based on the power electronic technology, so that the power electronic technology has the advantages of stabilizing voltage, solving the problems of temporary rise, temporary drop, overvoltage, undervoltage, three-phase imbalance and the like of the voltage of a power grid, and also has the functions of filtering harmonic waves and flicker of the voltage of the power grid, inhibiting oscillation of the power grid, compensating reactive power and the like. The equipment can continuously run on line, and the utilization rate is high. However, in the prior art, the control mode of the power quality control device is also a single-machine control mode, all the collected data and the control commands of data processing and issuing are carried out by a single controller, and the problems of large data processing amount, data delay and the like exist.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the control system of the active voltage quality adjusting device based on power electronics is provided to solve the problems that in the prior art, a control mode aiming at an electric energy quality control device is a single-machine control mode, all collected data and control instructions for data processing and issuing are carried out by a single controller, the data processing capacity is large, the data delay is high and the like.
The technical scheme of the invention is as follows:
a control system of an active voltage quality adjusting device based on power electronics comprises a voltage quality adjusting device, wherein the voltage quality adjusting device is connected with an FPGA module; the FPGA module is connected with the FPGA and the DSP module data buffer area through a data bus; the FPGA and DSP module data buffer area is connected with the data bus and the DSP module; the DSP module is connected with the upper computer through the Ethernet.
The DSP module is responsible for communicating with the upper computer, and carries out harmonic voltage analysis and detection, sends the harmonic voltage instruction that will detect, set up parameter, start-up and shutdown control command to the FPGA module through FPGA and DSP module data buffer to upload the state information of FPGA module to the upper computer and carry out real-time supervision.
The FPGA module obtains a sinusoidal voltage instruction through the setting parameters obtained by the DSP module and a reference sinusoidal signal, the sinusoidal voltage instruction is stored in the FPGA module in a sinusoidal array form, the FPGA module provides sampling frequency for the ADC, the ADC converts sampled voltage and current signals after receiving the sampling frequency provided by the FPGA module, the converted signals are sent to the corresponding control module for control calculation, and the obtained modulation signals are sent to the waveform generation module to be compared with triangular waves generated in the FPGA module to obtain driving signals of the power switch device.
The parallel connection and the series connection of the voltage quality adjusting device are controlled by adopting a voltage current double closed loop.
The series side voltage loop of the voltage quality adjusting device adopts repeated control to realize the no-difference tracking of the output voltage and improve the disturbance resistance of the system.
And LCL filtering is adopted on the parallel side of the voltage quality adjusting device.
And an active damping algorithm is added on the network access side of the voltage quality adjusting device to restrain the resonance peak of the LCL filter.
The parallel side current is not affected by the network voltage distortion by adding the network voltage feedforward in the parallel side control of the voltage quality adjusting device.
The series side inverter control of the voltage quality adjusting device adopts double closed loop control of an outer ring of output voltage and an inner ring of inductive current.
The circuit also comprises a conditioning signal circuit, wherein the conditioning signal circuit comprises a filter circuit, a voltage bias circuit and a follower circuit; the filter circuit is connected with the voltage bias circuit; the voltage bias circuit is connected with the voltage bias circuit; the filter circuit is an active filter with an anti-aliasing filtering function; the voltage bias circuit amplifies the filtered detection signal within a voltage range of normal work of the DSP; the follower circuit is isolated from a rear circuit to meet the requirements of DSP detection and control.
The invention has the beneficial effects that:
the invention adopts a control mode of a double-CPU structure based on DSP and FPGA to separately carry out data acquisition and processing, thereby reducing the pressure of the controller; and various signals entering the DSP are conditioned, so that the interference is reduced, the stability is improved, and the problems of large data processing capacity, data delay and the like caused by the fact that all the acquired data and control instructions for data processing and issuing are carried out by a single controller in the prior art which is used for the control mode of the power quality control device are solved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
A control system of an active voltage quality adjusting device based on power electronics comprises a voltage quality adjusting device, wherein the voltage quality adjusting device is connected with an FPGA module; the FPGA module is connected with the FPGA and the DSP module data buffer area through a data bus; the FPGA and DSP module data buffer area is connected with the data bus and the DSP module; the DSP module is connected with the upper computer through the Ethernet.
The DSP is responsible for communicating with an upper computer, analyzing and detecting harmonic voltage, sending detected harmonic voltage instructions, setting parameters, control commands of starting, stopping and the like to the FPGA through a data interaction buffer area, and uploading information such as the state of the FPGA to the touch screen for real-time monitoring; the FPGA obtains a sinusoidal voltage instruction through the setting parameters obtained by the DSP and a reference sinusoidal signal, the sinusoidal voltage instruction is stored in the FPGA in a sinusoidal array form, the FPGA provides sampling frequency for an ADC chip, the ADC chip receives the sampling frequency provided by the FPGA to convert sampled voltage and current signals, the converted signals are sent to a corresponding control module to be controlled and calculated, and the obtained modulation signals are sent to a waveform generation module to be compared with triangular waves generated in the FPGA to obtain driving signals of the power switching device. The parallel connection side and the series connection side are controlled by voltage and current double closed loops, and the voltage loop of the series connection side is controlled repeatedly to realize the no-difference tracking of output voltage and improve the disturbance resistance of the system.
The LCL is adopted at the parallel side for filtering, the filter can introduce a pair of resonance poles for the grid-connected inverter, the damping ratio of the resonance poles is zero, the oscillation frequency is high, and the stability of the system is influenced. Therefore, in order to suppress the resonance peak caused by the LCL filter, the network access side adds an active damping algorithm to suppress the resonance peak of the LCL filter, thereby increasing the stability of the system. The active damping control only increases the system damping through an algorithm, and compared with a mode of increasing the damping resistance, the active damping control has no additional damping resistance, so that the loss of the system is not increased, the system efficiency is improved, and the capacitive current feedback active damping in the active damping implementation method is simple and convenient to implement and wide in application. The parallel side control is added with the power grid voltage feedforward to ensure that the parallel side current is not influenced by the power grid voltage distortion, thereby ensuring the stability of the direct current bus voltage and the normal inversion output of the serial side.
The inverter on the series side is controlled, a double closed loop control system of an outer ring of output voltage and an inner ring of inductive current is adopted, the outer ring of voltage adopts repeated control aiming at a load which possibly has periodic disturbance, voltage distortion can be effectively inhibited, given voltage can be quickly tracked, a P controller is adopted in a current loop, and in addition, load current feedforward is introduced in order to resist the influence of a nonlinear load. The output signal of the AC output current regulator is output topologically after being delayed by an inertia link, the difference is made between the output signal and the capacitor voltage to form an inductance voltage, the voltage at two ends of the inductance forms a current flowing through the inductance through an equivalent reactance, the sum of the inductance current and the load current is a capacitor current, and the sum of the inductance current and the load current and the capacitance reactance of the capacitor form the output voltage at two ends of the capacitor.
The A/D of the DSP chip can only input voltage signals, analog quantity signals such as voltage, current, temperature and the like required by a control system need to be processed through a corresponding detection and conditioning circuit, and are converted into digital quantity through an A/D sampling module of the DSP chip to be calculated and processed by the DSP.
The signal conditioning circuit is a key part of the invention and is concerned with the accuracy of the current detection, which directly affects the compensation effect of the device.
The voltage quality adjusting device can produce the compensating current signal after DSP TMS320F2808 handles, and the compensating current signal of handling is according to in the real-time collection to voltage, electric current signal, and the precision of gathering the signal also can influence the compensation effect of the unbalanced automatic regulating apparatus of three-phase load, so only guarantee the real-time collection of electrical parameter, the precision of gathering the signal, just can guarantee the unbalanced automatic regulating apparatus compensation effect of three-phase load, guarantee electric energy quality.
In an actual circuit, a plurality of electrical parameters of detection objects are very different, the detected electrical parameters need to pass through a voltage or current conditioning circuit after being sampled by a current or voltage transformer, so that the normal working input voltage range of the DSPTMS320F2808 is met, and if the input voltage range is exceeded, a DSP chip will be burnt out. The signal conditioning circuit has the following functions: firstly, alternating voltage or current signals detected by a transformer or a related circuit are conditioned into analog voltage signals of normal work of a DSP, analog voltage of normal work of DSPTMS320F2808 is 0-3V, the analog voltage signals at two ends of the direct current side of an inverter output by the voltage transformer or the related voltage detection circuit are converted into normal work voltage of the DSP, and finally the analog voltage signals meeting the requirements after conversion are sent to an ADC module of the DSP for signal conversion.
The signal conditioning circuit consists of three parts, namely a filter circuit, a voltage bias circuit and a follower circuit. Whether the DSP can collect the correct detection signal depends on the precision of the conditioning circuit, a filter circuit is often added to improve the anti-interference performance of the conditioning circuit, and a magnetic ring is connected in series to the detection signal. The anti-aliasing filtering function is to filter high-frequency signals generated by electromagnetic interference of the three-phase load unbalance automatic adjusting device in a use environment, the selected active filter is required to meet the Nyquist sampling theorem, and the time constant is far greater than the period of an interference signal and is smaller than the period of a useful signal; the voltage bias circuit amplifies the filtered detection signal and is within the voltage range of normal work of the DSP; the follower circuit is isolated from the back circuit, and can meet the requirements of DSP detection and control.
Active voltage quality adjusting device it includes: the low-voltage main loop is connected with the power electronic function module; the power electronic function module is connected with the thyristor component.
The thyristor assembly is characterized by further comprising a bypass control circuit, wherein the bypass control circuit realizes forced commutation of the thyristor assembly at any time so as to realize switching between a main circuit and a bypass. The low-voltage main loop and the bypass control circuit are composed of a thyristor and an alternating current contactor to realize rapid switching.
The power electronic function module comprises an input LCL filtering unit, and the input LCL filtering unit is connected with a linear three-level IGBT; the linear three-level IGBT is connected with the output LCL filtering unit.
And determining the voltage of the IGBT, wherein the rated voltage of a system is 220V, the fluctuation is 20% up and down, the direct current voltage after natural rectification is about 300V, and the IGBT with the rated voltage of 650VDC is selected.
The maximum output current of the module is 35A, because the system outputs harmonic current, the crest factor of the current is large, a large margin is reserved when the IGBT is selected, and the IGBT with the rated current of 70A is selected according to experience.
The discrete form IkW75N65ES5 of the English flying company is selected as the switching device of the system by integrating the factors of switching frequency, loss, heat dissipation and the like.
The power electronic function module further comprises a soft start alternating current contactor and a soft start resistor, and plays a role in limiting starting current.
The power electronic functional module adopts a parallel connection structure with modular design.
The rated current of the three-level IGBT is 75A, and the three-level IGBT is integrally packaged by adopting EasyPack 2B.
The rated current of the IGBT module is 75A, so that the safety margin is 3 times by adopting the parallel connection mode of the two IGBT modules, and the service life of the IGBT can be effectively prolonged.
Half bridge arm voltage formed by the IGBT is 1300V, and enough safety margin is reserved. Through a special direct current bus overvoltage detection circuit and program control, the working voltage of the IGBT module can be guaranteed to be not more than 850V under various working conditions.
The input LCL filtering unit comprises a grid-connected VSC alternating current side formed by Lg and Cf, Ls of the LCL filtering unit is system impedance, Vk, k = a, b and c is converter output voltage, ek is power grid alternating current voltage, ik is converter output current, if is filtering branch current, and iks is converter output current.
Claims (10)
1. A control system of an active voltage quality adjusting device based on power electronics comprises the voltage quality adjusting device and is characterized in that: the voltage quality adjusting device is connected with the FPGA module; the FPGA module is connected with the FPGA and the DSP module data buffer area through a data bus; the FPGA and DSP module data buffer area is connected with the data bus and the DSP module; the DSP module is connected with the upper computer through the Ethernet.
2. A control system for a power electronics based active voltage quality adjustment device according to claim 1, characterized in that: the DSP module is responsible for communicating with the upper computer, and carries out harmonic voltage analysis and detection, sends the harmonic voltage instruction that will detect, set up parameter, start-up and shutdown control command to the FPGA module through FPGA and DSP module data buffer to upload the state information of FPGA module to the upper computer and carry out real-time supervision.
3. A control system for a power electronics based active voltage quality adjustment device according to claim 1, characterized in that: the FPGA module obtains a sinusoidal voltage instruction through the setting parameters obtained by the DSP module and a reference sinusoidal signal, the sinusoidal voltage instruction is stored in the FPGA module in a sinusoidal array form, the FPGA module provides sampling frequency for the ADC, the ADC converts sampled voltage and current signals after receiving the sampling frequency provided by the FPGA module, the converted signals are sent to the corresponding control module for control calculation, and the obtained modulation signals are sent to the waveform generation module to be compared with triangular waves generated in the FPGA module to obtain driving signals of the power switch device.
4. A control system for a power electronics based active voltage quality adjustment device according to claim 1, characterized in that: the parallel connection and the series connection of the voltage quality adjusting device are controlled by adopting a voltage current double closed loop.
5. A control system of a power electronics based active voltage quality adjustment device according to claim 4, characterized in that: the series side voltage loop of the voltage quality adjusting device adopts repeated control to realize the no-difference tracking of the output voltage and improve the disturbance resistance of the system.
6. A control system of a power electronics based active voltage quality adjustment device according to claim 4, characterized in that: and LCL filtering is adopted on the parallel side of the voltage quality adjusting device.
7. A control system for a power electronics based active voltage quality adjustment device according to claim 6, characterized by: and an active damping algorithm is added on the network access side of the voltage quality adjusting device to restrain the resonance peak of the LCL filter.
8. A control system of a power electronics based active voltage quality adjustment device according to claim 4, characterized in that: the parallel side current is not affected by the network voltage distortion by adding the network voltage feedforward in the parallel side control of the voltage quality adjusting device.
9. A control system for a power electronics based active voltage quality adjustment device according to claim 1, characterized in that: the series side inverter control of the voltage quality adjusting device adopts double closed loop control of an outer ring of output voltage and an inner ring of inductive current.
10. A control system for a power electronics based active voltage quality adjustment device according to claim 1, characterized in that: the circuit also comprises a conditioning signal circuit, wherein the conditioning signal circuit comprises a filter circuit, a voltage bias circuit and a follower circuit; the filter circuit is connected with the voltage bias circuit; the voltage bias circuit is connected with the voltage bias circuit; the filter circuit is an active filter with an anti-aliasing filtering function; the voltage bias circuit amplifies the filtered detection signal within a voltage range of normal work of the DSP; the follower circuit is isolated from a rear circuit to meet the requirements of DSP detection and control.
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| CN202010786177.4A CN111934430A (en) | 2020-08-07 | 2020-08-07 | Control system of active voltage quality adjusting device based on power electronics |
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| CN202010786177.4A CN111934430A (en) | 2020-08-07 | 2020-08-07 | Control system of active voltage quality adjusting device based on power electronics |
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2020
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