CN103457446A - Energy storage current device three-phase voltage independent current limiting control method - Google Patents
Energy storage current device three-phase voltage independent current limiting control method Download PDFInfo
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- CN103457446A CN103457446A CN2013103990136A CN201310399013A CN103457446A CN 103457446 A CN103457446 A CN 103457446A CN 2013103990136 A CN2013103990136 A CN 2013103990136A CN 201310399013 A CN201310399013 A CN 201310399013A CN 103457446 A CN103457446 A CN 103457446A
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Abstract
The invention discloses an energy storage current device three-phase voltage independent current limiting control method. The energy storage current device three-phase voltage independent current limiting control method comprises the steps that a phase-locked ring with thee independent phases is provided, the angle of each phase is independently locked, and therefore angle difference is effectively reduced; a voltage ring with thee three independent phases is provided, the reference voltage of each phase is calculated and is independently controlled, and therefore output voltage deviation is effectively reduced; three-phase independent power calculated is carried out, and therefore different power can be output by each phase respectively. The energy storage current device three-phase voltage independent current limiting control method effectively improves the utilization ratio of an energy storage current device under unbalanced load and unbalanced voltage conditions, improves system operation economical efficiency and stability, and has good universality, practicability and application prospects.
Description
Technical field
The invention belongs to the power electronics control technology of field of power, be applicable to the current transformer control technology that three-phase is independently controlled.
Background technology
Development along with the distributed energy generation technology, the capacity of distributed power generation is increasing, a large amount of distributed power source access electrical networks will inevitably affect the safe and stable operation of electrical network, and now micro-electrical network is suggested as a kind of organizational form that can bring into play distributed power source potential.Micro-electrical network correlation technique fast development in recent years, micro-electrical network has become a new developing direction of field of power.
Energy accumulation current converter is as the energy conversion unit in micro-electrical network, and the effect in micro-electrical network is vital.At present energy accumulation current converter adopts three phase controls mostly, three facies-controlled advantages be control simple, reliable, but three facies-controlled prerequisites be think line voltage and load be all balance or approximate equilibrium.And in reality, the load in micro-electrical network is very likely unbalanced, if still adopt three phase controls will inevitably cause the waste of place capacity, affect the economy of operation of power networks, also can affect the safe and stable operation of micro-electrical network in the time of seriously; Uncompensated load in micro-electrical network also can cause the imbalance of line voltage simultaneously, and now energy accumulation current converter can produce negative-sequence current, causes DC voltage fluctuation, also can reduce the available capacity of current transformer, also can affect stability and the economy of operation of power networks.
Summary of the invention
The present invention has adopted a kind of three-phase voltage independence control technology to be applied in the control technology of energy accumulation current converter, technical problem to be solved by this invention: power to unbalanced load under balanced voltage, balance load supplying under unbalance voltage, under unbalance voltage, to unbalanced load, power, economy and the stability of the operation of raising system.
Specific implementation of the present invention is as follows:
A kind of three-phase voltage independence Current limited Control method of energy accumulation current converter, is characterized in that, said method comprising the steps of:
Step 1: the energy accumulation current converter control system adopts independently phase-locked loop to three-phase voltage, at first by every phase voltage sampler, is gathered the voltage of corresponding phase, locks the angle of this phase voltage by Digital Phase-Locked Loop Technology, and the control parameter of three phase-locked loops is identical;
Step 2: the energy accumulation current converter control system adopts respectively independently Voltage loop to three-phase voltage, result according to phase-locked loop output, and, in conjunction with the desired value of this phase, every independently pi regulator that adopts mutually calculates the Voltage Reference of this phase and carries out independent control, the control parameter of three Voltage loop is identical;
Step 3: energy accumulation current converter arranges three-phase independence rated output ring, and the power ring of each phase calculates the power of each phase according to the voltage and current of this phase and the output of phase-locked loop, and carries out independently power and control.
The present invention also further comprises following optimal technical scheme:
In step 1, the every phase voltage amplitude voltage that is input as energy accumulation current converter output of phase-locked loop, be output as the angle of this phase voltage;
Phase-locked loop comprises the pi regulator sum-product intergrator in coordinate converter, positive sequence voltage extractor, phase-locked loop; The voltage collected is sent into the positive sequence voltage extractor, by the positive sequence voltage extractor, extracts positive sequence voltage; The positive sequence voltage and 0 extracted is compared, difference is sent into to the pi regulator in described phase-locked loop; The output of the pi regulator in described phase-locked loop adds the input of the result of system frequency as integrator, and integrator is output as the angle finally be locked into.
In step 2, Voltage loop be input as the output of this phase desired value and this phase phase-locked loop, be output as the pulse signal of this phase;
Voltage loop comprises the links such as pi regulator in Voltage loop, pulse scaler, pulse follower; The desired value that is input as corresponding phase and the actual value of pi regulator, the angle calculation obtained according to phase-locked loop obtains the Voltage Reference of every phase simultaneously, and the described desired value of input can be the power expectation, can be also the voltage expectation; The analog voltage reference that pulse scaler obtains pi regulator is sent into the pulse follower after being converted to numerical signal; The pulse follower calculates the pulse signal that should export according to Voltage Reference, be output as the two-way pwm pulse of every phase upper and lower bridge arm, and wherein, described pwm pulse can be the SPWM pulse, can be also the SVPWM pulse.
In step 3, the phase-locked loop of the voltage that is input as this phase, electric current and this phase of power ring is exported, and is output as active power and the reactive power of this phase;
Power ring comprises the links such as voltage sample device, current sampler, coordinate converter, power calculator and Power Decomposition device.The voltage sample device be input as ac bus voltage, current sampler be input as every phase current; The angle that the voltage and current that the coordinate converter basis collects and phase-locked loop obtain becomes easy-to-handle direct current signal by AC signal; Power calculator is according to the output rated output of voltage, electric current coordinate converter; The Power Decomposition device is decomposed the power obtained, and obtains active power and reactive power.
The present invention has following beneficial effect:
The present invention has adopted a kind of three-phase voltage independence control technology, has overcome the impact on the system operation of Voltage unbalance and laod unbalance.
The present invention can guarantee the reliable power supply to load when system voltage is uneven, has improved the stability of system operation.
The present invention can be under the laod unbalance condition, makes that energy accumulation current converter is every exports different power mutually, to adapt to the demand of unbalanced load, has improved the utilization ratio of energy accumulation current converter, has also improved the stability of system operation simultaneously.
The accompanying drawing explanation
The three-phase voltage independence Current limited Control system architecture diagram that Fig. 1 is energy accumulation current converter of the present invention;
Fig. 2 is phase-locked loop flow chart in control method of the present invention;
Fig. 3 is voltage control flow chart of the present invention;
Fig. 4 power calculation flow chart of the present invention.
Embodiment
Below according to Figure of description, also in conjunction with concrete case, technical scheme of the present invention is further explained in detail.
Fig. 1 is control system structured flowchart of the present invention.Control system comprises 3 parts: phase-locked loop part, power calculation link, voltage calculate link.System is input as ac bus three-phase voltage, device three-phase current, is output as pwm signal.Phase-locked loop is according to the voltage locking angle collected; The power calculation link is calculated active power and reactive power according to the output of the voltage, electric current and the phase-locked loop that collect; The voltage control loop root section calculates according to desired value, actual value and phase-locked loop output the pulse signal that should export, and pulse signal is given to the drive plate of major loop by optical fiber, and then realizes the control to device.
Control system based on above-mentioned, the invention discloses a kind of three-phase voltage independence Current limited Control method of energy accumulation current converter, it is characterized in that, said method comprising the steps of:
Step 1: the energy accumulation current converter control system adopts independently phase-locked loop to three-phase voltage, at first by the voltage of every phase acquisition oneself, locks the angle of this phase voltage by Digital Phase-Locked Loop Technology, and the control parameter of three phase-locked loops is identical;
Fig. 2 is digital phase-locked loop schematic diagram of the present invention.The present invention adopts independently digital phase-locked loop.Phase-locked loop be input as the every phase voltage amplitude voltage of ac bus, be output as every phase angle.Phase-locked loop comprises the links such as coordinate converter, positive sequence voltage extractor, pi regulator sum-product intergrator.The voltage collected is sent into the positive sequence voltage extractor, by the positive sequence voltage extractor, extracts positive sequence voltage; The positive sequence voltage and 0 extracted is compared, difference is sent into to pi regulator; The output of pi regulator adds the input of the result of system frequency as integrator, and integrator is output as the angle finally be locked into.Pi regulator proportional gain K and integration time constant T need to be according to the actual conditions adjustment, relevant with hardware parameter, major loop structure etc., but the parameter of three pi regulators is identical.
Step 2: the energy accumulation current converter control system adopts respectively independently Voltage loop to three-phase voltage, result according to phase-locked loop output, and, in conjunction with the desired value of this phase, every independently pi regulator that adopts mutually calculates the Voltage Reference of oneself and carries out independent control, the control parameter of three Voltage loop is identical;
Fig. 3 is the voltage control flow process.The present invention adopts independently Voltage loop.Voltage loop comprises the links such as pi regulator, pulse scaler, pulse follower.Pi regulator be input as desired value and actual value, the angle calculation obtained according to phase-locked loop obtains the Voltage Reference of every phase simultaneously, the expectation of input can be the power expectation, can be also the voltage expectation; The analog voltage reference that pulse scaler obtains pi regulator is sent into the pulse follower after being converted to numerical signal; The pulse follower calculates the pulse signal that should export according to Voltage Reference, be output as the two-way pwm pulse of every phase upper and lower bridge arm, can be the SPWM pulse, can be also the SVPWM pulse; The parameter of pi regulator need to be according to the actual conditions adjustment, and relevant with the capacity of hardware parameter, major loop parameter and energy accumulation current converter, the parameter of three pi regulators is identical.
Step 3: energy accumulation current converter arranges three-phase independence rated output ring, and the power of each phase is calculated in the output of every voltage and current according to this phase and phase-locked loop, and carries out independently power and control.
Fig. 4 is the power calculation flow process.Three phase power of the present invention independently calculates.Power calculation comprises the links such as voltage sample device, current sampler, coordinate converter, power calculator and Power Decomposition device.The voltage sample device be input as ac bus voltage, current sampler be input as every phase current; The angle that the voltage and current that the coordinate converter basis collects and phase-locked loop obtain becomes easy-to-handle direct current signal by AC signal; Power calculator is according to the output rated output of voltage, electric current coordinate converter; The Power Decomposition device is decomposed the power obtained, and obtains active power and reactive power.
The applicant is described in detail case study on implementation of the present invention in conjunction with bright book accompanying drawing; but those skilled in the art should understand; above case study on implementation is only the preferred embodiments of the invention; detailed explanation is just in order to help the reader better to understand spirit of the present invention; and be not the pin limiting the scope of the invention; on the contrary, any any improvement or modification of doing based on invention spirit of the present invention all should be within this uses novel protection range.
Claims (4)
1. the three-phase voltage independence Current limited Control method of an energy accumulation current converter, is characterized in that, said method comprising the steps of:
Step 1: the energy accumulation current converter control system adopts independently phase-locked loop to three-phase voltage, at first by every phase voltage sampler, is gathered the voltage of corresponding phase, locks the angle of this phase voltage by Digital Phase-Locked Loop Technology, and the control parameter of three phase-locked loops is identical;
Step 2: the energy accumulation current converter control system adopts respectively independently Voltage loop to three-phase voltage, result according to phase-locked loop output, and, in conjunction with the desired value of this phase, every independently pi regulator that adopts mutually calculates the Voltage Reference of this phase and carries out independent control, the control parameter of three Voltage loop is identical;
Step 3: energy accumulation current converter arranges three-phase independence rated output ring, and the power ring of each phase calculates the power of each phase according to the voltage and current of this phase and the output of phase-locked loop, and carries out independently power and control.
2. Current limited Control method according to claim 1 is characterized in that:
In step 1, the every phase voltage amplitude voltage that is input as energy accumulation current converter output of phase-locked loop, be output as the angle of this phase voltage;
Phase-locked loop comprises the pi regulator sum-product intergrator in coordinate converter, positive sequence voltage extractor, phase-locked loop; The voltage collected is sent into the positive sequence voltage extractor, by the positive sequence voltage extractor, extracts positive sequence voltage; The positive sequence voltage and 0 extracted is compared, difference is sent into to the pi regulator in described phase-locked loop; The output of the pi regulator in described phase-locked loop adds the input of the result of system frequency as integrator, and integrator is output as the angle finally be locked into.
3. Current limited Control method according to claim 1 is characterized in that:
In step 2, Voltage loop be input as the output of this phase desired value and this phase phase-locked loop, be output as the pulse signal of this phase;
Voltage loop comprises the links such as pi regulator in Voltage loop, pulse scaler, pulse follower; The desired value that is input as corresponding phase and the actual value of pi regulator, the angle calculation obtained according to phase-locked loop obtains the Voltage Reference of every phase simultaneously, and the described desired value of input can be the power expectation, can be also the voltage expectation; The analog voltage reference that pulse scaler obtains pi regulator is sent into the pulse follower after being converted to numerical signal; The pulse follower calculates the pulse signal that should export according to Voltage Reference, be output as the two-way pwm pulse of every phase upper and lower bridge arm, and wherein, described pwm pulse can be the SPWM pulse, can be also the SVPWM pulse.
4. Current limited Control method according to claim 1 is characterized in that:
In step 3, the phase-locked loop of the voltage that is input as this phase, electric current and this phase of power ring is exported, and is output as active power and the reactive power of this phase;
Power ring comprises the links such as voltage sample device, current sampler, coordinate converter, power calculator and Power Decomposition device.The voltage sample device be input as ac bus voltage, current sampler be input as every phase current; The angle that the voltage and current that the coordinate converter basis collects and phase-locked loop obtain becomes easy-to-handle direct current signal by AC signal; Power calculator is according to the output rated output of voltage, electric current coordinate converter; The Power Decomposition device is decomposed the power obtained, and obtains active power and reactive power.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105656047A (en) * | 2014-12-02 | 2016-06-08 | 国家电网公司 | Micro-grid voltage perturbation control system and method |
| CN107634509A (en) * | 2017-10-16 | 2018-01-26 | 北京科诺伟业科技股份有限公司 | A kind of current limit method of virtual synchronous machine |
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| CN102035216A (en) * | 2010-12-15 | 2011-04-27 | 南京航空航天大学 | Grid-connected control method and device for combining generator and matrix converter |
| US20130027993A1 (en) * | 2011-07-29 | 2013-01-31 | Zhuohui Tan | Power conversion system with transient event ride-through capability and method thereof |
| CN103094916A (en) * | 2011-11-02 | 2013-05-08 | 山东锦华电力设备有限公司 | Three-phase three-wire system interphase balance method based on electric power active power filter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102035216A (en) * | 2010-12-15 | 2011-04-27 | 南京航空航天大学 | Grid-connected control method and device for combining generator and matrix converter |
| US20130027993A1 (en) * | 2011-07-29 | 2013-01-31 | Zhuohui Tan | Power conversion system with transient event ride-through capability and method thereof |
| CN103094916A (en) * | 2011-11-02 | 2013-05-08 | 山东锦华电力设备有限公司 | Three-phase three-wire system interphase balance method based on electric power active power filter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105656047A (en) * | 2014-12-02 | 2016-06-08 | 国家电网公司 | Micro-grid voltage perturbation control system and method |
| CN107634509A (en) * | 2017-10-16 | 2018-01-26 | 北京科诺伟业科技股份有限公司 | A kind of current limit method of virtual synchronous machine |
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Application publication date: 20131218 |