CN106571643B - Light storage micro-grid system control method - Google Patents
Light storage micro-grid system control method Download PDFInfo
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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
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
A light storage micro-grid system control method is characterized in that an energy management system of a light storage micro-grid system is used for detecting harmonic content and power factors at a common connection point of the light storage micro-grid system, and a multi-scale resonance controller under a rotating coordinate is used for realizing static-error-free control of fundamental wave current and harmonic wave current; by optimally controlling the energy storage converter of the optical storage micro-grid system, the functions of reactive current compensation and harmonic current compensation of the optical storage micro-grid system in a grid-connected mode are realized, specified subharmonics in the optical storage micro-grid system are eliminated, and the electric energy quality of the micro-grid system is improved.
Description
Technical Field
The invention relates to a control method for a light storage micro-grid system.
Background
With the rapid development of new energy, the output power fluctuation caused by external environmental conditions causes great impact on the power grid, so that the development of centralized new energy is challenged more originally. The micro-grid system is an autonomous system which is composed of distributed power sources, energy storage devices, energy conversion devices and related loads and can realize self control, protection and management, the appearance of the micro-grid well solves the contradiction between new energy and the power grid, the output power of the distributed power sources is controllable, and the micro-grid system is friendly to the power grid. When the micro-grid operates in a grid-connected mode, a main control unit energy storage converter in the light storage micro-grid system can perform power scheduling according to an energy management system operation management strategy, and can execute a corresponding energy management strategy.
With the increasing number of electric equipment such as nonlinear loads, induction motors and the like, the light storage micro-grid system has the problems of low power factor, serious harmonic pollution and the like, so that the utilization efficiency of electric energy in the micro-grid system is reduced, the electric equipment is overheated, and the service life of electric elements is shortened. Considering that an energy storage converter and an active power filter device in the microgrid system have the same system topology, the energy storage converter can be optimized in function, active power is provided by executing energy management system scheduling, and meanwhile, harmonic wave and reactive power of the system are compensated, so that the load electric energy quality in the microgrid system is improved on the basis of not increasing investment.
The harmonic wave treatment and reactive compensation in the microgrid system can adopt a passive device scheme and an active device scheme. The passive device scheme mainly structurally comprises that a reactor and a capacitor are connected in series to form an LC series circuit which is connected in parallel in a system, and the resonance frequency of the LC series circuit is set on the harmonic frequency to be filtered, so that the aim of filtering and formulating the harmonic is fulfilled. The micro-grid system has the advantages that the cost is low, the harmonic waves cannot be completely compensated, the filtering effect is poor, the compensation frequency is fixed and cannot change after the equipment is designed, and if the resonance frequency is set to be poor, the micro-grid system can resonate with the system, so that the stability of the micro-grid system is influenced.
The traditional power active filter adopts a load current harmonic compensation method, extracts harmonic current by detecting load current, and takes the harmonic current as a control instruction reference value. The current tracking control is generally based on a PI controller under a single synchronous selection coordinate system, and because the PI controller has steady-state error on harmonic control, the compensation effect of a secondary current filter is limited; in the literature, PI control based on a multi-synchronous rotation coordinate system is proposed, but calculation is complicated due to a large amount of coordinate transformation, and the requirement for real-time performance of a controller is high.
Disclosure of Invention
The invention aims to overcome the defects that the quality of electric energy in a micro-grid system is poor, the power factor is low, hardware investment is required for separate treatment and a traditional active filter device cannot eliminate specified subharmonics due to nonlinear load, and provides a control method of an optical storage micro-grid system. The invention can optimally control the energy storage converter in the micro-grid system, realizes the functions of reactive current compensation and harmonic current compensation of the micro-grid system in a grid-connected mode, can completely eliminate specified subharmonics in the optical storage micro-grid system theoretically, improves the quality of electric energy in the micro-grid system and simultaneously embodies the friendliness of the micro-grid system to a power grid.
The invention utilizes the energy management system of the light storage microgrid system to detect the harmonic content and the power factor at the Point of Common Coupling (PCC) of the light storage microgrid system, and adopts the multiple proportion resonance controller under the rotating coordinate to realize the non-static control of the fundamental wave current and the harmonic wave current; by optimally controlling the energy storage converter of the optical storage micro-grid system, the functions of reactive current compensation and harmonic current compensation of the optical storage micro-grid system in a grid-connected mode are realized, specified subharmonics in the optical storage micro-grid system are eliminated, and the electric energy quality of the micro-grid system is improved.
The light storage micro-grid system comprises a photovoltaic power generation system, a storage battery, an energy storage converter, a harmonic detector, an energy management system and a load. The energy storage converter is a 3-port device and comprises 1 direct current port and 2 alternating current ports, the direct current ports are connected with the storage battery, the 2 alternating current ports are divided into a grid-connected side and an off-grid side, the grid-connected side is connected with a large power grid, and the off-grid side is connected with the photovoltaic power generation system and a load. The harmonic wave detector detects the electric quantity information at the public connecting point of the light storage micro-grid system. The energy management system collects electrical information of each point in the light-storage microgrid system and controls the light-storage microgrid system, and when a power grid fails, the energy storage converter operates in an off-grid mode to establish voltage and frequency for the light-storage microgrid system; when the power grid is normal, the energy storage converter operates in a grid-connected mode, receives power scheduling of the energy management system and executes different energy management strategies.
The invention adopts the multiple proportion resonance controller under the rotating coordinate to realize the non-static control of the fundamental current and the harmonic current. The multiple proportion resonance controller comprises a voltage detection unit, a current detection unit, a PLL phase locking unit, a positive and negative sequence separation unit, a multiple proportion resonance control unit and a PWM control unit. The voltage detection unit and the current detection unit respectively detect the voltage and the current of the PCC points of the light storage microgrid system, and positive and negative sequence components of the voltage and positive and negative sequence components of the current are respectively extracted through the positive and negative sequence separation unit. And voltage positive sequence components of the PCC points of the light storage micro-grid system pass through the PLL phase locking unit to obtain the angular frequency and the phase of the voltage of the power grid. The PCC point current of the light storage micro-grid system is separated into positive sequence current after passing through the positive and negative sequence separation unit And negative sequence currentWill be positive sequence currentAnd negative sequence currentConversion to positive sequence α β by Clark respectivelyPAnd negative sequence alpha betaNAxial, positive sequence α βPThe shafting is changed to the positive sequence dq through ParkPShafting, dqPActive current reference value under shaftingAnd a reactive current reference valueConversion into positive sequence alpha beta by inverse parkPActive current setting under shaftingAnd reactive current settingDue to dqPThe direct current quantity of active current and reactive current under the shafting is given as alpha betaPFundamental sinusoid in shafting, so if dqPThe active and reactive currents of the shaft are given as dc quantities, corresponding to α βPThe fundamental current under the shafting is given as sine quantity and all higher harmonic currents are given as 0, when the PCC point current of the optical storage microgrid system has different harmonics, the multiple proportional resonance control unit is additionally provided with a proportional resonance controller for specifying the harmonics, and the proportional resonance controller can realize no static error tracking on the corresponding word harmonics, so that the harmonics can be completely eliminated. At the same time, negative sequence alpha betaNNegative sequence current component under shaftingAndthe reference value current is given as 0, and the negative sequence current can be realized by adopting a controller which is the same as the positive sequenceThe specified subharmonic cancellation.
Transfer function G of multiple proportional resonant harmonic controllerPRThe expression is as follows:
in the formula (1), ω0Is the fundamental angular frequency, n is the harmonic order, kpIs a proportionality coefficient, knIs the nth harmonic resonance coefficient.
Under a synchronous rotation dq shafting, active current and reactive current are coupled, active and reactive decoupling is adopted, the active current and the reactive current are independently controlled, and reactive compensation is provided while grid-connected harmonic current is restrained.
The multiple proportion resonance harmonic wave control method adopted by the invention does not need complex synchronous rotating coordinate system transformation, realizes no-static-error tracking of alternating current signals through the multiple proportion resonance controller, and comprises the following steps:
1. the voltage detection unit detects the PCC (point of common coupling) voltage of the light storage micro-grid system, positive sequence voltage components and negative sequence voltage components are respectively extracted through the positive and negative sequence separation unit, and the fundamental wave voltage phase of the PCC of the light storage micro-grid system is obtained through the positive sequence voltage of the power grid through the PLL (phase locked loop) digital phase-locked loop unit;
2. the current detection unit detects that the phase currents of PCC points of the micro grid system are i respectivelya、ib、icRespectively extracting positive sequence current components through a positive sequence and negative sequence separation unitAnd a negative sequence current component
3. Fundamental positive sequence current componentTransforming the coordinate system into a two-phase synchronous rotating coordinate systemWhereinWhich represents the active current component of the current,which represents the reactive current component of the current,andchange to stationary alpha beta by inverse parkPThe axis is sine quantity. The multiple proportional resonance controller comprises fundamental current control and harmonic current control, and because the proportional resonance controller has infinite gain at fundamental wave and corresponding subharmonic frequency, the static-error-free control of the fundamental wave current and the corresponding subharmonic current can be realized theoretically;
4. the energy storage converter outputs active power and reactive power according to the dispatching of an energy management system of the light storage microgrid system, and eliminates appointed subharmonics. Positive sequence fundamental wave current is given as active and reactive power, positive sequence harmonic current is controlled to be 0, negative sequence fundamental wave and harmonic current are given to be 0, and negative sequence current control is realized to be 0;
5. the energy management system detects PCC harmonic content and power factor of a public connection point of the light storage micro-grid system in real time, the energy storage converters of the energy system and the light storage micro-grid system exchange information through a Modbus protocol, and the energy storage converters compensate reactive power and harmonic current in the micro-grid system according to an energy management strategy, so that the electric energy quality requirement of the micro-grid system is met.
The energy management system monitors the harmonic waves and the power factors of the grid-connected point in real time through the electric energy quality analyzer, and when the harmonic waves of the grid-connected point exceed a set threshold value, the harmonic waves of the grid-connected point are subjected to harmonic vibration coefficient knSetting a non-zero value to enable designated subharmonic control may eliminate the subharmonic while being manually accessible through the energy management systemThe harmonic waves in the energy elimination range of the energy storage converter are eliminated. The nonlinear rectification load in the optical storage microgrid system is a typical harmonic source, the invention carries out default elimination on 5, 7, 11 and 13 subharmonics with the maximum harmonic content generated by nonlinear household loads such as a television, an energy-saving lamp, a computer, a charger and the like in the microgrid system, other subharmonics are eliminated according to an energy management strategy, and when the harmonic current in the microgrid system exceeds the compensation capacity of the energy storage converter, only the characteristic subharmonics with larger harm can be selected and compensated. If a passive filter device is installed in the microgrid system, characteristic subharmonics which cannot be compensated by a compensation passive filter can be selected, and any subharmonics can be eliminated theoretically by multiple proportion resonance harmonic control, but the frequency of the digital signal processor is limited, and the maximum elimination of 25 subharmonics is considered in the optical storage microgrid system.
The multiple proportional resonance control adopted by the invention is the superposition of fundamental proportional resonance control and harmonic proportional resonance control. The energy storage converter collects the voltage of the PCC point, the PCC point current is collected after positive and negative sequence separation and then phase locking is carried out on the PCC point voltage to obtain the angular frequency and the phase of the fundamental wave of the power grid, the current of the PCC point is collected, positive sequence and negative sequence components of the current are separated through positive and negative sequence separation control, and the positive sequence fundamental wave three-phase currentTransforming the coordinate system into a two-phase synchronous rotating coordinate systemWhereinWhich represents the active current component of the current,representing a reactive current component. Active given current and reactive given current are changed through inverse park in a synchronous rotating coordinate system and are converted into a two-phase positive sequence static coordinate system alpha betaPAnd controlling under a shaft system, and simultaneously controlling the negative sequence fundamental current and the harmonic current to be zero. Multiple proportional resonant harmonic controlThe control method is characterized in that the fundamental wave proportional resonance control and the multiple harmonic proportional resonance control are connected in parallel, and the multiple proportional resonance harmonic control has infinite gain at the fundamental wave and the harmonic wave, so that the multiple proportional resonance control can realize the differential-free control of the fundamental wave and the appointed subharmonic wave.
The existing method for performing closed-loop elimination on the harmonic waves of the PCC points generally detects the harmonic wave current at a harmonic wave source, the control equipment sends out reverse output current for compensation, and if multiple harmonic wave sources exist, current detection needs to be performed on each harmonic wave source. The method has the advantages that no matter how many harmonic sources exist in the optical storage microgrid system, only one PCC point of the optical storage microgrid system is detected and controlled.
The invention has the following effects:
(1) and the electric energy quality of the light storage micro-grid system is improved. By adopting the multiple proportion resonance harmonic controller, the harmonic generated by the nonlinear load in the microgrid system can be completely eliminated theoretically, the current harmonic suppression is realized on the basis of not increasing the hardware equipment of the active power filter, and the electric energy quality in the microgrid system is improved.
(2) Compared with a control strategy without appointed subharmonic compensation, the method can eliminate the appointed subharmonic in the microgrid system, and is flexible in harmonic compensation mode.
(3) And dynamic reactive power compensation can be performed, so that reactive power in the microgrid system can be dynamically compensated, and the power factor of the microgrid system is improved.
(4) The traditional active power filter device needs to detect the harmonic current at the load, and when the nonlinear load in the microgrid system is far away, the cost of an acquisition circuit is increased.
Drawings
Fig. 1 is a topological diagram of an optical storage microgrid system;
FIG. 2 is a topology diagram of an energy storage converter;
FIG. 3 is a schematic diagram of a multiple scale resonance specifying such a harmonic controller;
FIG. 4 is a diagram illustrating a control of harmonic suppression in multiple proportional resonance of a power storage converter.
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the optical storage microgrid system applying the present invention includes a photovoltaic power generation system, an energy storage system, an energy management system, an electric energy quality analyzer and a load, wherein the energy storage system includes a storage battery and an energy storage converter, the energy storage converter has three ports, a direct current port is connected to the storage battery, an alternating current port has a grid-connected side port and an off-grid side port, the photovoltaic power generation system and the load are connected to an alternating current side port bus of the energy storage converter, the energy storage converter is connected to a grid, and the electric energy quality analyzer monitors and analyzes PCC point power and electric energy quality in real time. The micro-grid system is controlled through the energy storage system, the energy storage converter and the electric energy quality analyzer.
The grid-connected side of the energy storage system is connected to a large power grid through a public connection point of the light storage microgrid system, and the load side of the energy storage converter is respectively connected with a photovoltaic system and a load. The electric energy quality analyzer monitors the electric energy quality of the public connection point of the light storage micro-grid system, and the energy storage system monitors and controls the light storage power generation system, the energy storage system, the load and the electric energy quality analyzer and carries out comprehensive scheduling. The EMS system and the energy storage converter are communicated through a Modbus protocol.
1. Voltage detection unit detects light storage microgrid system PCC point AB, BC, CA line voltage eab、ebc、ecaCalculating the PCC point phase voltage e according to the formula (2)a、eb、ec。
2. When three-phase power in the optical storage microgrid system is unbalanced, the three-phase unbalanced quantity can be divided into a positive component, a negative component and a negative sequence component according to a symmetrical component method, the positive and negative sequence separation is realized by adopting an all-pass filter, the all-pass filter can realize 90-degree phase shift between input and output and keep the amplitude unchanged, and the transfer function of the all-pass filter is shown in a formula (3).
And carrying out digital discrete transformation on the formula to obtain a differential formula of 90-degree phase shift, and then realizing the extraction of positive and negative sequence separation according to the relation between positive and negative sequence transformation. PCC point phase voltage ea、eb、ecAfter passing through the positive and negative sequence separation unit, the positive sequence voltage is Negative sequence voltage of
3. PCC point positive sequence voltage component of light storage micro-grid systemThrough a PLL digital phase-locked loop unit, the PCC fundamental wave voltage phase theta of the light storage micro-grid system is obtainedp。
4. Current detection unit detects current i of PCC point phase of light storage micro-grid systema、ib、icThe positive sequence current after passing through the positive and negative sequence separation units isNegative sequence current of
5. The positive and negative sequence voltages and currents of the PCC points in the three-phase static coordinate system are respectively converted into the two-phase static alpha beta shafting through the clarkAndwherein the clark transformation formula is shown as formula (4).
6. The active current and the reactive current are given under a synchronous rotating coordinate system, and a conversion formula from a two-phase static alpha beta shaft system to a two-phase synchronous rotating dq shaft system is shown as a formula (5). Active current and reactive current are coupled in a synchronous selection coordinate system, active and reactive decoupling control needs to be carried out, and the decoupling process is shown in FIG. 4;
the active and reactive current commands are dc quantities, the active and reactive power are given by the following equation (6), e, due to the grid voltage orientationqIf 0, the above equation can be simplified to equation (7), and the grid voltage d-axis component e is not considered when the grid voltage fluctuation is not considereddFor constant value, by controlling the given value of active currentReactive power can be controlled; controlling a reactive current setpointReactive power can be controlled;
wherein: e.g. of the typedAs d-axis component of the grid voltage, eqFor the q-axis component of the mains voltage, idrefGiven value of active current, iqrefThe reactive current is given. When detecting that the power factor in the microgrid system is low, the energy management system sends out reactive power to the energy storage converter through a Modbus communication protocol according to an energy management strategyAnd dispatching the command, and adjusting the reactive power to meet the requirement of the microgrid system by the energy storage converter according to the command of the energy management system.
7. Active and reactive current components under the synchronous rotation dq shafting enter an alpha beta shafting under a static coordinate after being changed by inverse park, and active current and reactive current reference values under the positive sequence dq shafting are converted into active current and reactive current reference values under the positive sequence alpha beta shaftingAndwhereinIs the sine quantity of the fundamental wave; the discretization output current of the multi-proportional harmonic controller is shown in a formula (8); at the same time, negative sequence current set pointGiven as 0;
where n is the resonant controller frequency, uPR_n(k) For n times the resonant controller outputs a voltage T at a time ksSampling period for digital system ierr(k) Is the difference between the current set and the current feedback, k, in the alpha beta axispIs the resonance coefficient, krIs the resonance coefficient.
8. In order to restrain the voltage fluctuation of the power grid and realize the effect of quick response of control, the invention adopts the feed-forward control of the power grid voltage, as shown in formula (9), the positive and negative sequence control output voltages under an alpha-beta shafting can be obtained respectively
vα＝eα+upr (9)
Wherein v isαTo control the output voltage, eαIs the grid voltage uprThe voltage is output by the multi-ratio resonant controller.
9. Control the output voltages to be respectivelyObtaining positive sequence control output voltage through reverse click changeAnd negative sequence control output voltage
10. Controlling the output voltage according to the positive sequence and the negative sequence of the formula (10) to be superposed to obtain an output voltage command va、vb、vc(ii) a Voltage va、vb、vcThrough the SVPWM control unit, a PWM switch driving signal is output to drive a switching tube to be switched on and switched off, expected current is generated, and harmonic current is controlled;
the energy management system schedules the output current of the energy storage converter and the harmonic elimination times according to different energy management operation strategies, improves the power factor of the microgrid system, reduces the harmonic content in the microgrid system and accordingly improves the electric energy quality in the microgrid system.
Claims (1)
1. A control method of a light storage micro-grid system is characterized by comprising the following steps: the control method comprises the steps that an energy management system of the optical storage microgrid system is used for detecting harmonic content and power factors at a common connection point of the optical storage microgrid system, and a multi-proportion resonance controller under a rotating coordinate is used for realizing non-static control over fundamental wave current and harmonic current; by optimally controlling an energy storage converter of the optical storage micro-grid system, the functions of reactive current compensation and harmonic current compensation of the optical storage micro-grid system in a grid-connected mode are realized, specified subharmonics in the optical storage micro-grid system are eliminated, and the electric energy quality of the micro-grid system is improved;
the control method of the energy storage converter of the light storage micro-grid system comprises the following steps:
(1) the voltage detection unit detects the voltage of a public connection point of the optical storage micro-grid system, positive sequence voltage components and negative sequence voltage components are respectively extracted through the positive and negative sequence separation unit, and fundamental voltage phases of the public connection point of the optical storage micro-grid system are obtained by passing the positive sequence voltage of the power grid through the PLL (phase locked loop) digital phase-locked loop unit;
(2) the current detection unit detects that the phase currents of the public connection points of the optical storage micro-grid system are i respectivelya、ib、icRespectively extracting positive sequence current components through a positive sequence and negative sequence separation unitAnd a negative sequence current component
(3) Positive sequence current componentTransforming the coordinates into a two-phase synchronous rotating coordinate systemWhereinWhich represents the active current component of the current,representing reactive, active current componentsAnd reactive current componentObtaining stationary alpha beta through reverse park changePSine quantity under a shaft system; the multiple proportional resonance controller comprises fundamental current control and harmonic current control, and due to infinite gain of the multiple proportional resonance controller at fundamental wave and corresponding subharmonic frequency, the multiple proportional resonance controller can realize the static-error-free control of the fundamental current and the corresponding subharmonic current;
(4) the energy storage converter outputs active power and reactive power according to the dispatching of an energy management system of the light storage micro-grid system and eliminates specified subharmonics; positive sequence fundamental wave current is given as active and reactive power, positive sequence harmonic current is controlled to be 0, negative sequence fundamental wave and harmonic current are given to be 0, and negative sequence current control is realized to be 0;
the multiple proportion resonance controller is as follows:
where n is the number of resonant controller times, iPR_n(k) For n times the resonant controller outputs a voltage T at a time ksSampling period for digital system ierr(k) Is the difference between the current set and the current feedback, k, in the alpha beta axispIs a proportionality coefficient, krIs the resonance coefficient, iPRAnd (k-1) is the output voltage of the last sampling period at the moment k of the proportional resonant controller.
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| CN109599878B (en) * | 2018-12-07 | 2020-06-02 | 南京工程学院 | Energy storage converter control method for power quality optimization demand |
| CN110943245B (en) * | 2019-12-12 | 2021-02-23 | 上海捷氢科技有限公司 | Fuel cell diagnosis harmonic current generation method and system and diagnosis device |
| CN111446726B (en) * | 2020-04-03 | 2023-04-21 | 太原理工大学 | Rapid positive and negative sequence separation method for power grid asymmetry and harmonic faults |
| CN111585294A (en) * | 2020-05-29 | 2020-08-25 | 天津电气科学研究院有限公司 | Method for centralized compensation of three-phase current imbalance of submerged arc furnace power supply system |
| CN113206504A (en) * | 2021-06-10 | 2021-08-03 | 荣信汇科电气股份有限公司 | Power supply network voltage comprehensive compensation control method based on chain type power electronic converter |
| CN114756072B (en) * | 2022-04-26 | 2023-11-10 | 江苏微导纳米科技股份有限公司 | Electric energy management method and related device for pure resistance heating system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836235A (en) * | 2015-06-02 | 2015-08-12 | 国家电网公司 | Microgrid multi-inverter parallel operation control method adopting bus voltage compensation |
| EP3041109A1 (en) * | 2013-08-30 | 2016-07-06 | Kyocera Corporation | Distributed power supply system and power conditioner |
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| EP3041109A1 (en) * | 2013-08-30 | 2016-07-06 | Kyocera Corporation | Distributed power supply system and power conditioner |
| CN104836235A (en) * | 2015-06-02 | 2015-08-12 | 国家电网公司 | Microgrid multi-inverter parallel operation control method adopting bus voltage compensation |
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