CN104953618A - Networking and off-network uniform control method of energy storage inverter - Google Patents
Networking and off-network uniform control method of energy storage inverter Download PDFInfo
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- CN104953618A CN104953618A CN201510343067.XA CN201510343067A CN104953618A CN 104953618 A CN104953618 A CN 104953618A CN 201510343067 A CN201510343067 A CN 201510343067A CN 104953618 A CN104953618 A CN 104953618A
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Abstract
The invention discloses a networking and off-network uniform control method of an energy storage inverter. According to the method, a control system is adopted; when the inverter is in a networking/off-network state, the control system adopts voltage and current dual-loop control, the outer loop is a voltage outer loop, an inner loop is a current inner loop, the inner and outer loops adopt PI control, the voltage outer loop is in a saturation/desaturation state, so that the inverter works in a current source mode/voltage source model; when in a state between a networking state and an off-network state, the inverter can be seamlessly switched between the two working states. The networking and off-network uniform control method of the energy storage inverter provided by the invention is capable of realizing automatic and smooth switching among the networking state, the off-network state and the state between the networking state and the off-network state.
Description
Technical field
The present invention relates to micro-capacitance sensor or distributed generation system field, particularly a kind of energy storage inverter from net unified control method.
Background technology
Along with the development of distributed generation technology, traditional centralized electricity generation system makes the transition to distributed generation system.Distributed generation system is close to load, and power supply reliability is high, can power, decrease transmission losses for outlying mountain area or shopping centre.The strong energy problem alleviating China, improves power supply reliability.
Distributed generation system, primarily of distributed power source, energy storage device, load and electrical network composition, because energy storage inverter has the function of peak load shifting, is widely used in distributed generation system.Because photovoltaic generation, wind power generation distributed system have randomness, intermittent feature, frequency stabilization, power-balance and voltage stabilization time therefore in order to maintain distributed generation system islet operation, just need to add energy storage link in systems in which.Therefore just particularly important to the control of energy storage inverter.
Traditional control method under net two states, designs different control loop grid-connected, and time grid-connected, inverter control ring is electric current loop, and inverter is current source, the active power that inverter can be regulated to export according to load condition in distributed system and reactive power; Be Voltage loop from inverter control ring during net, inverter is voltage source, and the constant voltage constant frequency being responsible for system controls.But when system is grid-connected and from when switching between net two states, because inverter adopts two kinds of different control loops, cannot reach level and smooth switching, can impact system, the reliability of impact power supply, can make distributed power source off-grid time serious.
Summary of the invention
In order to overcome above-mentioned deficiency of the prior art, the present invention proposes a kind of energy storage inverter and from net unified control method, it can realize also, from net state and between automatic smoothing switch.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of energy storage inverter also from net unified control method, comprises control system,
When inverter be in grid-connected/from net state time, control system adopt voltage, double current loop modulation, its outer-loop is outer voltage, inner ring is current inner loop, its inner and outer ring all adopts PI to control, now outer voltage saturated/move back saturated, inverter works in current source mode/voltage source mode;
When inverter be in and net state and between net state time, it can switch by automatic seamless between two kinds of operating states.
As the improvement of technique scheme, described control system comprises inverter, critical load, grid-connected inverters switches Si, electrical network panel switches Sg and electrical network, phase-locked loop, it adopts uneven phase-locked, and the line voltage Vg gathered obtains phase-locked angle q through phase-locked loop.
As the improvement of technique scheme, described outer voltage comprises a set-point, it is specially the maximum permissible value of control system long-time running, described current inner loop comprises an output setting amplitude limit value Id_ref, and the range of operation that the angular frequency amplitude limit value of described phase-locked loop allows according to control system is set as (49.5-50.2Hz) * 2* π.
As the improvement of technique scheme, when inverter be in and net state time, described outer voltage set-point and line voltage normal value have deviation, now outer voltage is saturated, inverter works under the control of single current inner loop, inverter is controlled as current source, and exports with the amplitude limit value Id_ref of setting.
As the improvement of technique scheme, when inverter is in from net state, load voltage will follow given voltage, now outer voltage is moved back saturated, current inner loop amplitude limit value Id_ref need be greater than load current, and inverter works under double-loop control, and inverter is controlled as voltage source.
As the improvement of technique scheme, when inverter by and net state to when switching from net state, outer voltage exports decline and moves back saturated until load voltage reaches set-point, under capacitive/inductive load, line voltage angular frequency will be offset to phase-locked loop angular frequency amplitude limit value, and the automatic smoothing reaching phase-locked angle switches.
As the improvement of technique scheme, when inverter by from net state to and net state switch time, outer voltage is saturated gradually, phase lock loop locks electrical network phase angle, and automated system operation, in constant current mode, completes and switches from net to grid-connected automatic smoothing.
The beneficial effect that the present invention brings has:
Inverter of the present invention adopts and from net unified control method, current source control model and voltage source control model are integrated in a control system, under grid-connect mode, inverter can according to the active power of loading condition regulation output in system and reactive power; From under net pattern, inverter carries out constant voltage constant frequency control, can provide support the amplitude of system voltage and frequency; When switching between two kinds of patterns, automatic smoothing can be reached and switch, to system without impact, ensure that the reliability of power supply.
Accompanying drawing explanation
Below in conjunction with drawings and the specific embodiments, the invention will be further described,
Accompanying drawing 1 is the control system block diagram of the embodiment of the present invention;
Accompanying drawing 2 is different mode switching flow figure of the embodiment of the present invention.
Embodiment
The present invention is a kind of energy storage inverter and from net unified control method, it can realize also, from net state and between automatic smoothing switch.
With reference to accompanying drawing 1, this control system is by energy storage inverter, critical load, grid-connected inverters switches Si, electrical network panel switches Sg, electrical network and phase-locked loop composition, system adopts uneven phase-locked, the line voltage vg collected obtains phase-locked angle q through phase-locked loop, grid-connected inverters voltage and current is separated conversion by positive-negative sequence and obtains voltage positive sequence component Vd+_fdb, Vq+_fdb and electric current positive sequence component Id+_fdb, Iq+_fdb, negative sequence component Id-_fdb, Iq-_fdb, then be separated control by the positive-negative sequence under synchronous coordinate system and obtain PWM ripple, the break-make of control inverter switching tube.
Simultaneously in above-mentioned control system, inverter is grid-connected and all adopt voltage, double current loop modulation from during net state, do not change control model and switch object fast to reach, wherein outer voltage comprises a set-point, it is specially the maximum permissible value of control system long-time running, current inner loop comprises an output setting amplitude limit value Id_ref, and the range of operation that the angular frequency amplitude limit value of phase-locked loop then allows according to control system is set as (49.5-50.2Hz) * 2* π.
With reference to accompanying drawing 2, the present invention is also as follows from the unified concrete grammar controlled of net:
1) normal grid-connected time, grid-connected inverters switches Si and electrical network panel switches Sg close, outer voltage set-point is the maximum permissible value of system long-time running, because line voltage is lower than set-point, make outer voltage output saturation, energy storage inverter exports with the amplitude limit value Id_ref of setting, and work in constant current mode, the anglec of rotation is the phase-locked angle of electrical network;
2) time from network operation, grid-connected inverters switches Si and electrical network panel switches Sg disconnect, load voltage will follow given voltage, outer voltage is moved back saturated, current inner loop is given, and to be load current given, and at this moment the amplitude limit value Id_ref of current inner loop need be greater than load current, and inverter works under double-loop control, be controlled as voltage source, the anglec of rotation is phase-locked loop amplitude limit value;
3) grid-connected extremely from net switching, after grid cut-off, electrical network panel switches Sg disconnects, and after control mode switch completes, grid-connected inverters switches Si disconnects, the switching of completing circuit pattern.Load voltage will follow given voltage automatically, and outer voltage exports decline and moves back saturated, until load voltage reaches given, under capacitive/inductive load, after grid cut-off, voltage angle frequency will be offset to phase-locked loop amplitude limit value, and the automatic smoothing reaching phase-locked angle switches.And if Id_ref equals load current during net state, then switch transient voltage without impact, desirable seamless switching can be reached;
4) from net to grid-connected switching, after power system restoration, electrical network panel switches Sg closes, and after PLL locks phase angle, grid-connected inverters switches Si closes, the switching of completing circuit pattern.After power system restoration, load voltage phase angle follows electrical network phase angle automatically, closed Si after locking electrical network phase angle, electrical network virtual voltage is greater than because outer voltage is given, outer voltage output saturation, automated system operation, in constant current mode, completes from net to grid-connected automatic switchover.
It should be noted that; above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; after those skilled in the art reads the application; the various amendment carried out the present invention with reference to above-described embodiment or the behavior of change, all within the right application requirement protection range of patent of the present invention.
Claims (7)
1. energy storage inverter from a net unified control method, comprise control system, is characterized in that:
When inverter be in grid-connected/from net state time, control system adopt voltage, double current loop modulation, its outer-loop is outer voltage, inner ring is current inner loop, its inner and outer ring all adopts PI to control, now outer voltage saturated/move back saturated, inverter works in current source mode/voltage source mode;
When inverter be in and net state and between net state time, it can switch by automatic seamless between two kinds of operating states.
2. a kind of energy storage inverter according to claim 1 from net unified control method, it is characterized in that: described control system comprises inverter, critical load, grid-connected inverters switches Si, electrical network panel switches Sg and electrical network, phase-locked loop, it adopts uneven phase-locked, and the line voltage Vg gathered obtains phase-locked angle q through phase-locked loop.
3. a kind of energy storage inverter according to claim 2 from net unified control method, it is characterized in that: described outer voltage comprises a set-point, it is specially the maximum permissible value of control system long-time running, described current inner loop comprises an output setting amplitude limit value Id_ref, and the range of operation that the angular frequency amplitude limit value of described phase-locked loop allows according to control system is set as (49.5-50.2Hz) * 2* π.
4. a kind of energy storage inverter according to claim 3 from net unified control method, it is characterized in that: when inverter be in and net state time, described outer voltage set-point and line voltage normal value have deviation, now outer voltage is saturated, inverter works under the control of single current inner loop, inverter is controlled as current source, and exports with the amplitude limit value Id_ref of setting.
5. a kind of energy storage inverter according to claim 3 from net unified control method, it is characterized in that: when inverter is in from net state, load voltage will follow given voltage, now outer voltage is moved back saturated, current inner loop amplitude limit value Id_ref need be greater than load current, inverter works under double-loop control, and inverter is controlled as voltage source.
6. a kind of energy storage inverter according to claim 3 from net unified control method, it is characterized in that: when inverter by and net state to when switching from net state, outer voltage exports decline and moves back saturated until load voltage reaches set-point, under capacitive/inductive load, line voltage angular frequency will be offset to phase-locked loop angular frequency amplitude limit value, and the automatic smoothing reaching phase-locked angle switches.
7. a kind of energy storage inverter according to claim 3 from net unified control method, it is characterized in that: when inverter by from net state to and net state switch time, outer voltage is saturated gradually, phase lock loop locks electrical network phase angle, automated system operation, in constant current mode, completes and switches from net to grid-connected automatic smoothing.
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| CN106849172A (en) * | 2017-03-22 | 2017-06-13 | 东南大学 | In light storage alternating current-direct current microgrid and off-network seamless switching strategy |
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| CN105978024B (en) * | 2016-06-07 | 2018-10-23 | 东南大学 | A kind of energy storage inverter based on complex variable and off-network seamless switching control algolithm |
| CN109245137A (en) * | 2018-09-30 | 2019-01-18 | 中国科学院广州能源研究所 | A kind of control method of energy accumulation current converter |
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| CN113904427A (en) * | 2021-08-31 | 2022-01-07 | 科华数据股份有限公司 | Power supply mode switching method and device |
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| CN105978024B (en) * | 2016-06-07 | 2018-10-23 | 东南大学 | A kind of energy storage inverter based on complex variable and off-network seamless switching control algolithm |
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| CN106849172B (en) * | 2017-03-22 | 2019-09-10 | 东南大学 | Light stores up in alternating current-direct current microgrid and off-network seamless switching strategy |
| CN109245137A (en) * | 2018-09-30 | 2019-01-18 | 中国科学院广州能源研究所 | A kind of control method of energy accumulation current converter |
| CN109245137B (en) * | 2018-09-30 | 2021-11-16 | 中国科学院广州能源研究所 | Control method of energy storage converter |
| CN112134312A (en) * | 2020-09-28 | 2020-12-25 | 阳光电源股份有限公司 | Photovoltaic inverter quick response control method and control device |
| CN113904427A (en) * | 2021-08-31 | 2022-01-07 | 科华数据股份有限公司 | Power supply mode switching method and device |
| CN113904427B (en) * | 2021-08-31 | 2022-09-06 | 科华数据股份有限公司 | Power supply mode switching method and device |
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