CN112491075A - Novel energy storage inverter control device and control method thereof - Google Patents
Novel energy storage inverter control device and control method thereof 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
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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
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- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in 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
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- H—ELECTRICITY
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- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
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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
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- 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
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a novel energy storage inverter control device and a control method thereof, wherein the control device consists of a detection component, a decision and calculation component, a communication and UI component and a wave-generating driving component; the data detected by the detection component and the related data acquired by the communication and UI component are transmitted to the decision and calculation component; the decision and calculation component obtains current references for counteracting reactive components and harmonic components of load current, current references for peak clipping and valley filling and zero sequence current references, the three current references are superposed together to be compared with three-phase current of the inverter, the three current references are input into the PI controller and output as voltage signals, and then the voltage signals are superposed with feed-forward components of three-phase voltage to be divided by the sum of real-time positive and negative bus voltage; and converting the final result into a PWM signal of the energy storage inverter, and amplifying and driving the energy storage inverter through the wave-transmitting driving component. The invention enables the energy storage inverter to realize the functions of peak clipping, valley filling, reactive compensation, harmonic treatment and three-phase unbalance compensation.
Description
Technical Field
The invention belongs to the field of energy storage inverters, and particularly relates to a control device and a control method of an energy storage inverter.
Background
In recent years, in many factory and mine enterprises, problems of low power factor, large harmonic content, unbalanced load and the like of a power grid are caused due to the use of various power equipment. Therefore, the power department requires the factory and mining enterprises to add active filters (APF) and other devices to perform reactive power compensation, harmonic suppression and three-phase imbalance compensation.
In addition, due to the particularity of the plant and mining enterprises, the problems of low power factor, high harmonic content, unbalanced load and the like of the power grid caused by the use of the power equipment are not always existed, but are intermittent. Thus, the active filter abatement operation is also intermittent, which results in a low overall active filter usage.
The active filter is essentially an inverter, such as the most widely used 100KVar active filter on the market, and the hardware topology thereof usually adopts a three-phase three-level inverter. The energy storage inverter can convert alternating current into direct current and also can convert the direct current into the alternating current, and the functions of peak clipping and valley filling can be realized.
At present, the power department adopts a time-of-use gradient electricity price scheme, and the time-of-use electricity prices are greatly different, for example, the electricity price at a certain place in China is 0.5583 yuan/degree, and the valley electricity is 0.3583 yuan/degree. In addition, the price of the energy storage battery is lower and lower, so that the method is favorable for converting alternating current into direct current to be stored in the battery when the electricity fee is low, and converting the direct current in the battery into the alternating current to be fed back to a power grid when the electricity fee is high.
In view of the above, it would be valuable to combine a tank inverter with an active filter. And, usually, factory and mining enterprises usually have a large space, and can be used for arranging an energy storage power station consisting of an energy storage inverter and an energy storage battery.
Disclosure of Invention
The invention aims to provide a novel energy storage inverter control device and a control method aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a novel energy storage inverter control device is composed of a detection component, a decision and calculation component, a communication and UI component and a wave-generating driving component;
the detection component detects three-phase load current IloadThree-phase network voltage U of AC networkSThree-phase current I of inverterSAnd sum of positive and negative bus voltages VbusInformation is transmitted to the decision and computation component;
the communication and UI component acquires real-time electricity price information and energy storage battery electric quantity information and transmits the information to the decision and calculation component; the decision and calculation component configures the working mode of the energy storage inverter into a rectification mode or an inversion mode;
the decision and calculation component sends PWM waves, the PWM waves are amplified through the wave sending driving component to drive the energy storage inverter to work, and power conversion is achieved. The decision and computation component specifically comprises: the device comprises a phase-locked loop angle calculation module, a load current reactive component and harmonic component extraction module, a midpoint balance calculation module, a current loop reference calculation module, a current loop calculation module and an inverter wave-sending control module;
the phase-locked loop angle calculation module is used for calculating the phase-locked loop angle according to the three-phase power grid voltage USConverting the abc/dq coordinate into a rotating coordinate system, and then obtaining an instantaneous angle value of the three-phase power grid voltage by adopting a phase-locked loop method;
the load current reactive component and harmonic component extraction module extracts three-phase load current IloadConverting the instantaneous angle of the three-phase power grid voltage obtained by the phase-locked loop into a rotating coordinate system through coordinate transformation, extracting the reactive component and the harmonic component of the three-phase load current, obtaining a current reference for counteracting the reactive component and the harmonic component of the load current, and marking as a current reference 1 (I)ref1)；
The neutral point balance calculation module obtains zero sequence current reference, which is marked as current reference 0 (I) through PI regulation according to the deviation of positive and negative bus voltagesref0)；
The current loop reference calculation module is used for referring the current to 0 (I)ref0) Current reference 1 (I)ref1) And a current reference 2 (I) of the energy storage inverter for peak clipping and valley fillingref2) Overlapping together; the current loop calculation module refers the result of the current loop reference calculation module to the three-phase current I of the inverterSCompared with the three-phase voltage U, the output result is a voltage signal which is input into the PI controllerSThe feed forward components are superposed and then divided by the sum V of the real-time positive and negative bus voltagesbus(ii) a Converting the final result into a PWM signal of the energy storage inverter;
the inverter wave-sending control module sends out PWM wave signals calculated by the current loop, and then the PWM wave signals are amplified by a wave-sending driving component of the control circuit to drive the energy storage inverter.
Furthermore, the circuit of the energy storage inverter comprises a three-phase three-level inverter and a bidirectional DC/DC module which are connected with the control device, so that the functions of peak clipping and valley filling, reactive compensation, harmonic wave treatment and three-phase unbalance compensation are realized.
Furthermore, the decision and calculation component further comprises a bidirectional DC/DC loop calculation module and a bidirectional DC/DC wave-sending control module, wherein the bidirectional DC/DC wave-sending control module sends out PWM waves to drive the bidirectional DC/DC switching device to realize bidirectional energy flow; the bidirectional DC/DC loop calculation module respectively stores the rectified energy of the energy storage inverter and provides energy for inversion of the energy storage inverter according to the flow direction of the energy.
Further, the energy storage inverter realizes the functions of peak clipping and valley filling, reactive compensation, harmonic suppression and three-phase unbalance compensation, and a user can adjust the current reference 1 (I) according to the requirementref1) And a current reference 2 (I)ref2) A free combination of several functions is achieved.
A control method of a novel energy storage inverter control device is characterized by comprising the following specific steps:
(1) transmitting the data detected by the detection component and the related data acquired by the communication and UI component to the decision and calculation component; the decision and calculation component configures the working mode of the energy storage inverter into a rectification mode or an inversion mode;
(2) according to the three-phase power grid voltage U, a phase-locked loop angle calculation module in a decision and calculation componentSConverting the abc/dq coordinate into a rotating coordinate system, and then obtaining an instantaneous angle value of the three-phase power grid voltage by adopting a phase-locked loop method;
(3) three-phase load current I is extracted through a module for extracting reactive component and harmonic component of load current in decision and calculation componentloadConverting the instantaneous angle of the three-phase power grid voltage obtained by the phase-locked loop into a rotating coordinate system through coordinate transformation, extracting the reactive component and the harmonic component of the three-phase load current, obtaining a current reference for counteracting the reactive component and the harmonic component of the load current, and marking as a current reference 1 (I)ref1)；
(4) Obtaining zero sequence current reference through a midpoint balance calculation module in the decision and calculation assembly according to the deviation of positive and negative bus voltages through PI regulation, and marking as current reference 0 (I)ref0)；
(5) Referencing the current to 0 (I) by a current loop reference computation module in the decision and computation componentref0) Current reference 1 (I)ref1) And a current reference 2 (I) of the energy storage inverter for peak clipping and valley fillingref2) Superposing; inputting the result into a current loop calculation module;
(6) a current loop calculation module in the decision and calculation assembly refers the result of the current loop reference calculation module to the three-phase current I of the inverterSCompared with the three-phase voltage U, the output voltage is input into a PI controller and outputSThe feed forward components are superposed and then divided by the sum V of the real-time positive and negative bus voltagesbus(ii) a Converting the final result into a PWM signal of the energy storage inverter; the input is input to an inverter wave-generating control module;
(7) an inverter wave-sending control module in the decision and calculation component sends out PWM wave signals, and the PWM wave signals are amplified by a wave-sending driving component of the control circuit to drive the energy storage inverter.
The invention has the beneficial effects that: the invention provides a novel control device and a control algorithm, so that an energy storage inverter can realize peak clipping and valley filling of a power grid and achieve the function of improving the power quality of the power grid through reactive compensation, harmonic wave treatment and three-phase unbalance compensation.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a structural diagram of a novel photovoltaic energy storage device of the present invention;
FIG. 2 is a view showing a structure of a control device according to the present invention;
FIG. 3 is a block diagram of a method for loop control of the energy storage inverter of the present invention;
fig. 4 is a reference structure diagram of a current loop for energy storage according to a first embodiment of the present invention;
fig. 5 is a loop structure diagram of a bidirectional DC-DC charging function according to an embodiment of the present invention.
Fig. 6 is a loop structure diagram of the bidirectional DC-DC for the discharging function in the second embodiment of the present invention.
Fig. 7 is a flowchart of the functional combination and priority of the energy storage inverter according to the third embodiment of the present invention.
Detailed Description
The invention provides a novel energy storage inverter control device and a control method thereof, which combine the peak clipping and valley filling functions of an energy storage inverter with the reactive power compensation and harmonic wave treatment functions of an active filter to generate the maximum value.
The hardware of the power part of the invention is three parts of a three-phase three-level inverter, a bidirectional DC/DC converter and an energy storage battery, as shown in figure 1. However, the selected circuit described above is only an exemplary circuit of the present invention. For example, the inverter can be a two-level inverter or a multi-level inverter, or other topologies which can realize alternating current-direct current bidirectional conversion; the energy storage module can also be a super capacitor or a flywheel energy storage module and the like; the bidirectional DC/DC converter is used for enabling the energy storage inverter to obtain stable direct current bus voltage and realizing charging and discharging of an energy storage battery, and can be a voltage boosting circuit, a voltage reducing circuit or a voltage boosting and reducing circuit, even can be removed according to actual conditions, namely the output of the inverter is directly connected with the battery.
To achieve the above object, the control device of the present invention can be divided into a detection component, a decision and calculation component, a communication and UI component, and a wave-generating driving component according to its functions, as shown in fig. 2.
The detection component detects the load current I of the three-phase local loadloadThree-phase voltage U of AC power gridSThree-phase current I of inverterSThe sum V of the positive and negative bus voltagesbusBattery current IbatVoltage V of the batterybatAnd the like, and sent to the decision-making and computation component.
The core chip of the decision and computation component is preferably a DSP (digital signal processor), but may also be a microprocessor such as an ARM or FPGA.
The communication and UI component has the functions of acquiring real-time electricity price information and configuring the working mode of the energy storage inverter, namely whether the energy storage inverter works in a rectification mode or an inversion mode, and then transmitting related data to the decision and calculation component (or the decision and calculation component automatically configures the working mode of the energy storage inverter according to the acquired information such as the real-time electricity price information and the battery electric quantity); and meanwhile, the decision and calculation component displays the related information on the upper computer.
The decision and calculation component sends out PWM waves which are amplified by the wave sending driving component to drive the three-phase three-level inverter and the bidirectional DC/DC converter to work, so that the function of power conversion is realized.
The decision and computation component includes: a phase-locked loop angle calculation module, a load current reactive component and harmonic component extraction module, a midpoint balance calculation module, a current loop reference calculation module, a current loop calculation module, an inverter wave-sending control module, a bidirectional DC/DC loop calculation module, and a bidirectional DC/DC wave-sending control module, as shown in fig. 3.
The phase-locked loop angle calculation module calculates the phase-locked loop angle according to the three-phase power grid voltage USConverting into a rotating coordinate system through abc/dq coordinate transformation, and then adoptingThe phase-locked loop method obtains the instantaneous angle value of the three-phase power grid voltage.
The module for extracting reactive component and harmonic component of load current extracts three-phase load current IloadThe instantaneous angle of the three-phase power grid voltage obtained by the phase-locked loop is converted into a rotating coordinate system through coordinate transformation, so that the fundamental wave active component, the reactive component and the harmonic component of the load current are separated, and the reactive component and the harmonic component of the load current are extracted.
The midpoint balance calculation module obtains zero sequence current through PI regulation according to the deviation of the positive BUS and the negative BUS and superposes the zero sequence current on the reference of the current loop.
The current loop reference calculation module consists of three parts, namely a zero sequence current reference (current reference 0I) obtained by the midpoint balance calculation moduleref0) Extracting a current reference from the reactive and harmonic components of the load current to cancel the reactive and harmonic components of the load current (current reference 1I)ref1) And a current reference (current reference 2I) of the energy storage inverter for peak clipping and valley fillingref2) And (4) forming. Wherein the current is referenced to 0Iref0Comparative Current reference 1Iref1And a current reference 2Iref2The three-phase unbalanced compensation system is very small, and can be ignored when realizing reactive compensation, harmonic suppression and three-phase unbalanced compensation functions in practical application.
In the current loop calculation module, the current loop refers to the result of the calculation module and the three-phase current I of the inverterSComparing, and outputting a voltage signal by the PI controller through the PI controller; the voltage signal and the three-phase voltage USThe feedforward components of (a) are superposed; the sum of the positive and negative bus voltages is divided by the sum Vbus(ii) a And converting the final result into a PWM signal of the energy storage inverter.
The inverter wave-sending control module sends out the PWM wave signal calculated by the current loop through a corresponding pin of the DSP, and then the PWM wave signal is amplified through a wave-sending driving subassembly of the control circuit to drive the energy storage inverter. The present invention can be divided into two modes of energy storage and energy release according to the flow direction of energy. And the bidirectional DC/DC loop calculation module respectively realizes an algorithm for storing the energy rectified by the energy storage inverter and providing the energy for inversion of the energy storage inverter according to the flow direction of the energy. The wave-transmitting control module of the bidirectional DC/DC transmits PWM waves to drive the bidirectional DC/DC switching device to realize the function of bidirectional energy flow.
The invention also provides a control method of the novel energy storage inverter control device, which comprises the following specific steps:
(1) transmitting the data detected by the detection component and the related data acquired by the communication and UI component to the decision and calculation component; the decision and calculation component configures the working mode of the energy storage inverter into a rectification mode or an inversion mode;
(2) according to the three-phase power grid voltage U, a phase-locked loop angle calculation module in a decision and calculation componentSConverting the abc/dq coordinate into a rotating coordinate system, and then obtaining an instantaneous angle value of the three-phase power grid voltage by adopting a phase-locked loop method;
(3) three-phase load current I is extracted through a module for extracting reactive component and harmonic component of load current in decision and calculation componentloadConverting the instantaneous angle of the three-phase power grid voltage obtained by the phase-locked loop into a rotating coordinate system through coordinate transformation, extracting the reactive component and the harmonic component of the three-phase load current, obtaining a current reference for counteracting the reactive component and the harmonic component of the load current, and marking as a current reference 1 (I)ref1)；
(4) Obtaining zero sequence current reference through a midpoint balance calculation module in the decision and calculation assembly according to the deviation of positive and negative bus voltages through PI regulation, and marking as current reference 0 (I)ref0)；
(5) Referencing the current to 0 (I) by a current loop reference computation module in the decision and computation componentref0) Current reference 1 (I)ref1) And a current reference 2 (I) of the energy storage inverter for peak clipping and valley fillingref2) Superposing; inputting the result into a current loop calculation module;
(6) a current loop calculation module in the decision and calculation assembly refers the result of the current loop reference calculation module to the three-phase current I of the inverterSCompared with the three-phase voltage U, the output voltage is input into a PI controller and outputSThe feed forward components are superimposed and divided by real-time positive and negative parentsSum of line voltages Vbus(ii) a Converting the final result into a PWM signal of the energy storage inverter; the input is input to an inverter wave-generating control module;
(7) an inverter wave-sending control module in the decision and calculation component sends out PWM wave signals, and the PWM wave signals are amplified by a wave-sending driving component of the control circuit to drive the energy storage inverter.
The invention is further illustrated below in three examples.
Example one
Assuming that the electricity price of the power grid is in a low price interval and the electricity quantity on the storage battery is in a low state, the energy storage inverter is in a rectification state, and can convert the alternating current of the power grid into direct current to be stored in the energy storage battery, and meanwhile, the function of an active filter is also realized. The current reference for implementing the commutation function in the control algorithm of the storage inverter is the current reference 2 (I) described aboveref2) (ii) a The current reference in the tank inverter control algorithm to implement the active filter function is the current reference 1 (I) described aboveref1) As shown in fig. 3.
Wherein the current is referenced 2 (I)ref2) Obtained by an inverter voltage loop calculation module in the control algorithm, as shown in fig. 4. In the voltage loop calculation module, the energy storage inverter BUS voltage reference (V)ref) Minus the sum V of the positive and negative BUS voltagesbusThe error value passes through a PI controller, and the result is the current reference 2 (I)ref2). The output of the inverter voltage loop will be clipped, the clipping being determined by the rated power of the inverter and the load that the inverter has dissipated as an active filter. Typically, the clipping value is the maximum rated current (I) of the energy storage inverterlimit) And a current reference 1 (I)ref1) The vector difference of (c).
In this embodiment, the bi-directional DC-DC is a current source that functions to charge the energy storage battery, as shown in fig. 5. The loop structure of the bidirectional DC-DC is a double-loop structure, the outer loop is a power loop, and the inner loop is a current loop.
Reference to the outer loop is the current reference 2 (I) described aboveref2) And three-phase alternating voltage USPower reference 1 (P) obtained by calculationref1) Power parameterExamination 1 (P)ref1) Comparing with the output power of the bidirectional DC-DC to obtain a difference, and passing the error through a PI comparator to obtain a result of a bidirectional DC-DC inner loop current loop reference 1 (I)DCref1). Output power of bidirectional DC-DC is controlled by charging current I of energy storage batterybatAnd battery voltage VbatThe product is obtained.
Current Loop reference 1 (I)DCref1) And a current loop reference 2 (I) obtained by calculation according to the temperature of the energy storage batteryDCref2) The comparison is taken as the final reference for the current loop. Final reference of current loop and charging current I of energy storage batterybatAnd comparing to obtain an error, outputting a PWM wave to drive the action of a corresponding switch tube of the bidirectional DC-DC after passing through a PI regulator, and finally realizing the function of charging the energy storage battery by the bidirectional DC-DC.
Example two
And assuming that the electricity price of the power grid is in a high-price interval and the electricity quantity on the energy storage battery is in a full state, the energy storage inverter works in an inversion mode at the moment, the direct current stored in the energy storage battery is converted into alternating current to be fed back to the power grid, and the energy storage inverter also realizes the function of an active filter. The current reference for implementing the inversion function in the control algorithm of the storage inverter is the current reference 2 (I) described aboveref2) (ii) a The current reference in the tank inverter control algorithm to implement the active filter function is the current reference 1 (I) described aboveref1). In the second embodiment, since the energy storage inverter performs different functions in peak clipping and valley filling from the first embodiment, the current reference 2 (I) in fig. 3ref2) In the opposite direction as in the first embodiment.
In this embodiment, the current reference 2 (I)ref2) For maximum rated current (I) of the inverterlimit) And a current reference 1 (I)ref1) The vector difference of (a) and the maximum output current value of the corresponding inverter into which the output power of the bidirectional DC-DC is converted are obtained by comparison.
In this embodiment, the bi-directional DC-DC is a voltage source, and its function is to provide a stable DC voltage source for the energy storage inverter. The bidirectional DC-DC is a dual-loop structure, one is a voltage loop, the other is a current loop, and the two loop structures are parallel structures, as shown in fig. 6.
Reference of voltage ring sets voltage V for inverter BUSrefThe feedback is the sum V of positive and negative BUS voltages of the inverterbusThe error between the two is passed through a PI regulator, and the result is a control quantity 1 (I) of bidirectional DC-DCcontrol1)。
The reference of the current loop is determined by the rated power of the bidirectional DC-DC and the discharge current allowed by the energy storage battery, and the reference I of the bidirectional DC-DC current loop is smaller than the reference I of the bidirectional DC-DC current loopDCref. Feedback of the current loop being the detected battery discharge current IbatCurrent loop reference IDCrefAnd feedback IbatThe error is obtained and then passes through a PI regulator, and the result is the control quantity 2 (I) of the bidirectional DC-DCcontrol2)。
Control quantity 1 (I) of bidirectional DC-DCcontrol1) And a control quantity 2 (I) of bidirectional DC-DCcontrol2) And the comparison is small, and the result is converted into a PWM signal to drive a bidirectional DC-DC switching tube, so that the bidirectional DC-DC provides a stable direct-current voltage source for the energy storage inverter.
EXAMPLE III
The functions of peak clipping and valley filling, reactive compensation, harmonic suppression and three-phase unbalance compensation of the energy storage inverter can be freely combined, and are not limited to the first embodiment and the second embodiment.
If the user only needs the energy storage inverter to have the function of peak clipping and valley filling, the current reference 1 (I) in the first embodiment and the second embodimentref1) Is zero; if the user only needs the energy storage inverter to have the functions of reactive power compensation, harmonic suppression and three-phase unbalance compensation, the current reference 2 (I) in the first embodiment and the second embodimentref2) I.e. zero.
If the user only needs to implement harmonic suppression for the active filter function of the energy storage inverter, but does not need to implement the functions of reactive compensation and three-phase unbalance compensation, then the current is referred to as 1 (I)ref1) The method is obtained by extracting the harmonic component of the load current without extracting the reactive component and the unbalanced component of the load current.
Additionally, a user may configure the priority of operation of the energy storage inverter.
If the user configures the active filter function of the energy storage inverter to have higher priority than the peak clipping and valley filling function (this is the default mode of the energy storage inverter, and this is the mode of both the first embodiment and the second embodiment). Then the current reference 1 (I) for the active filter function is implemented in the tank inverter control algorithmref1) And current reference 2 (I) for peak clipping and valley filling functionsref2) The vector sum has exceeded the maximum rated current (I) of the energy storage inverterlimit) The current reference 2 (I) actually used for the peak clipping and valley filling functionsref2) Is the maximum rated current (I)limit) Current reference 1 (I) with active filter functionref1) And (4) vector difference. Current reference 1 (I) when active filter functionsref1) Greater than or equal to the maximum rated current (I) of the energy storage inverterlimit) The energy storage inverter only has the function of an active filter.
If the user configures the priority of the peak clipping and valley filling function of the energy storage inverter to be higher than that of the active filter function. Then the current reference 1 (I) for the active filter function is implemented in the tank inverter control algorithmref1) And current reference 2 (I) for peak clipping and valley filling functionsref2) The vector sum has exceeded the maximum rated current (I) of the energy storage inverterlimit) Actual current reference 1 (I) for the active filter functionref1) Is the maximum rated current (I)limit) With current reference 2 (I) for peak clipping and valley filling functionsref2) And (4) vector difference. Current reference 2 (I) when used for peak clipping and valley filling functionsref2) Greater than or equal to the maximum rated current (I) of the energy storage inverterlimit) The energy storage inverter only has the function of peak clipping and valley filling.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (5)
1. The novel energy storage inverter control device is characterized by comprising a detection component, a decision and calculation component, a communication and UI component and a wave-generating driving component;
the detection component detects three-phase load current IloadThree-phase network voltage U of AC networkSThree-phase current I of inverterSAnd sum of positive and negative bus voltages VbusInformation is transmitted to the decision and computation component;
the communication and UI component acquires real-time electricity price information and the electric quantity of the energy storage battery and transmits the information and the electric quantity to the decision and calculation component; the decision and calculation component configures the working mode of the energy storage inverter into a rectification mode or an inversion mode;
the decision and calculation component sends PWM waves, the PWM waves are amplified through the wave sending driving component to drive the energy storage inverter to work, and power conversion is achieved. The decision and computation component specifically comprises: the device comprises a phase-locked loop angle calculation module, a load current reactive component and harmonic component extraction module, a midpoint balance calculation module, a current loop reference calculation module, a current loop calculation module and an inverter wave-sending control module;
the phase-locked loop angle calculation module is used for calculating the phase-locked loop angle according to the three-phase power grid voltage USConverting the abc/dq coordinate into a rotating coordinate system, and then obtaining an instantaneous angle value of the three-phase power grid voltage by adopting a phase-locked loop method;
the load current reactive component and harmonic component extraction module extracts three-phase load current IloadConverting the instantaneous angle of the three-phase power grid voltage obtained by the phase-locked loop into a rotating coordinate system through coordinate transformation, extracting the reactive component and the harmonic component of the three-phase load current, obtaining a current reference for counteracting the reactive component and the harmonic component of the load current, and marking as a current reference 1 (I)ref1)；
The neutral point balance calculation module obtains zero sequence current reference, which is marked as current reference 0 (I) through PI regulation according to the deviation of positive and negative bus voltagesref0)；
The current loop reference calculation module is used for referring the current to 0 (I)ref0) Current reference1(Iref1) And a current reference 2 (I) of the energy storage inverter for peak clipping and valley fillingref2) Overlapping together; the current loop calculation module refers the result of the current loop reference calculation module to the three-phase current I of the inverterSCompared with the three-phase voltage U, the output result is a voltage signal which is input into the PI controllerSThe feed forward components are superposed and then divided by the sum V of the real-time positive and negative bus voltagesbus(ii) a Converting the final result into a PWM signal of the energy storage inverter;
the inverter wave-sending control module sends out PWM wave signals calculated by the current loop, and then the PWM wave signals are amplified by a wave-sending driving component of the control circuit to drive the energy storage inverter.
2. The novel energy storage inverter control device as claimed in claim 1, wherein the circuit of the energy storage inverter comprises a three-phase three-level inverter and a bidirectional DC/DC module, which are connected to the control device, so as to realize the functions of peak clipping, valley filling, reactive compensation, harmonic suppression and three-phase unbalance compensation.
3. The novel energy storage inverter control device as claimed in claim 1, wherein the decision and calculation component further comprises a bidirectional DC/DC loop calculation module and a bidirectional DC/DC wave-sending control module, and the bidirectional DC/DC wave-sending control module sends out PWM waves to drive the bidirectional DC/DC switching device to realize bidirectional energy flow; the bidirectional DC/DC loop calculation module respectively stores the rectified energy of the energy storage inverter and provides energy for inversion of the energy storage inverter according to the flow direction of the energy.
4. The novel energy storage inverter control device as claimed in claim 2, wherein the energy storage inverter realizes peak clipping and valley filling, reactive power compensation, harmonic suppression and three-phase unbalance compensation, and a user can adjust the current reference 1 (I) according to the requirementref1) And a current reference 2 (I)ref2) A free combination of several functions is achieved.
5. The control method of the novel energy storage inverter control device based on claim 1 is characterized by comprising the following specific steps:
(1) transmitting the data detected by the detection component and the related data acquired by the communication and UI component to the decision and calculation component; the decision and calculation component configures the working mode of the energy storage inverter into a rectification mode or an inversion mode;
(2) according to the three-phase power grid voltage U, a phase-locked loop angle calculation module in a decision and calculation componentSConverting the abc/dq coordinate into a rotating coordinate system, and then obtaining an instantaneous angle value of the three-phase power grid voltage by adopting a phase-locked loop method;
(3) three-phase load current I is extracted through a module for extracting reactive component and harmonic component of load current in decision and calculation componentloadConverting the instantaneous angle of the three-phase power grid voltage obtained by the phase-locked loop into a rotating coordinate system through coordinate transformation, extracting the reactive component and the harmonic component of the three-phase load current, obtaining a current reference for counteracting the reactive component and the harmonic component of the load current, and marking as a current reference 1 (I)ref1)；
(4) Obtaining zero sequence current reference through a midpoint balance calculation module in the decision and calculation assembly according to the deviation of positive and negative bus voltages through PI regulation, and marking as current reference 0 (I)ref0)；
(5) Referencing the current to 0 (I) by a current loop reference computation module in the decision and computation componentref0) Current reference 1 (I)ref1) And a current reference 2 (I) of the energy storage inverter for peak clipping and valley fillingref2) Superposing; inputting the result into a current loop calculation module;
(6) a current loop calculation module in the decision and calculation assembly refers the result of the current loop reference calculation module to the three-phase current I of the inverterSCompared with the three-phase voltage U, the output voltage is input into a PI controller and outputSThe feed forward components are superposed and then divided by the sum V of the real-time positive and negative bus voltagesbus(ii) a Converting the final result into a PWM signal of the energy storage inverter; the input is input to an inverter wave-generating control module;
(7) an inverter wave-sending control module in the decision and calculation component sends out PWM wave signals, and the PWM wave signals are amplified by a wave-sending driving component of the control circuit to drive the energy storage inverter.
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Denomination of invention: A new type of energy storage inverter control device and its control method Granted publication date: 20220705 Pledgee: Ningbo Cixi Rural Commercial Bank Co.,Ltd. Pledgor: NINGBO WEIJI ELECTRIC POWER TECHNOLOGY Co.,Ltd. Registration number: Y2024980030403 |