CN104158211A - Multi-power-supply gridconnected system control method based on modularized multilevel convertor - Google Patents

Multi-power-supply gridconnected system control method based on modularized multilevel convertor Download PDF

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CN104158211A
CN104158211A CN201410360751.4A CN201410360751A CN104158211A CN 104158211 A CN104158211 A CN 104158211A CN 201410360751 A CN201410360751 A CN 201410360751A CN 104158211 A CN104158211 A CN 104158211A
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control
power
soc
component
storage battery
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CN104158211B (en
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高峰
张磊
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Shandong University
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Shandong University
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Abstract

The invention discloses a multi-power-supply gridconnected system control method based on a modularized multilevel convertor. The multi-power-supply gridconnected system control method comprises the following steps: the power control part of the modularized multilevel convertor generates a sinusoidal modulation wave; the sinusoidal modulated wave is sequentially subject to direct current supply control, an interphase circumfluence control and a gridconnected current direct current component inhibit control to superpose corresponding regulation value, and is finally subject to carrier wave dephasing SPWM modulation to generate a switch driving signal. The multi-power-supply gridconnected system control method can flexibly control the interphase circumfluence according to the operation state of the multi-power-supply gridconnected system.

Description

Many power grids system control method based on modular multilevel converter
Technical field
The present invention relates to a kind of many power grids system control method based on modular multilevel converter.
Background technology
Along with increasingly sharpening of energy crisis and environmental issue, for the research of renewable energy power generation technology, receive much concern.In regenerative resource grid-connected system, power inverter is important component part.Renewable energy source current (as photovoltaic array, wind-driven generator, fuel cell etc.) access electrical network need to by inverter by Energy transfer in the middle of electrical network.
At present, in regenerative resource grid-connected system, conventional power inverter has two-level inverter, Neutral Point Clamped multi-electrical level inverter, cascaded multilevel inverter and modular multilevel converter etc.
For two-level inverter and Neutral Point Clamped multi-electrical level inverter, after renewable energy source current is carried out to connection in series-parallel, as DC power supply, by inverter, concentrate access electrical network.
For cascaded multilevel inverter and modular multilevel converter, power supply can be disperseed in the middle of each basic module of access, by controlling each basic module, renewable energy source current is independently controlled, be conducive to improve the efficiency of regenerative resource grid-connected system.
Therefore, the systematic research of the many power grids based on multi-level converter receives much concern.But renewable energy system is vulnerable to the restriction of environmental condition, its exert oneself there is fluctuation, the feature such as intermittence and unpredictability, this will affect safe, reliable, the stable operation of electrical network, and the people's production and life are brought to profound influence.Therefore, in the urgent need to extra reserve capacity, realize the assistant services such as the dynamic equilibrium of supply and demand and frequency modulation and voltage modulation.
Energy storage technology receives much concern as the effective technology that solves extensive renewable power supply access electrical network, and research and the application of energy storage technology are all constantly being supported in countries in the world always.Similar to regenerative resource grid-connected system, energy-storage system is exactly using energy storage device (comprising storage battery, energy accumulation device for fly wheel, superconducting magnetic energy storage etc.) as power supply, then energy storage device by power inverter by Energy Transfer in the middle of electrical network.In energy-storage system, conventional power inverter has two-level inverter, diode clamp type multi-electrical level inverter, cascaded multilevel inverter and modular multilevel converter etc.
Using two-level inverter during as the energy converter of regenerative resource grid-connected system or energy-storage system, conventionally need to be connected with electrical network through step-up transformer, step-up transformer can cause more power loss.The too much power supply of DC side connection in series-parallel is unfavorable for improving the operational efficiency of power supply in addition.
Using Neutral Point Clamped multi-electrical level inverter as energy converter, therefore the same with two-level inverter, be often applied in the regenerative resource grid-connected system and energy-storage system of low voltage grade, need to be connected with electrical network through step-up transformer.
Usining cascaded inverter and modular multilevel converter (Modular Multilevel Converters, MMC) can improve grid-connected electric pressure as energy converter and be directly connected with electrical network, has reduced the power loss that step-up transformer causes.
Cascaded inverter and each module of modular multilevel converter can connection in series-parallel some DC power supply (comprising renewable energy source current, energy storage device etc.), so cascaded inverter and modular multilevel converter can increase the degree of scatter of DC power supply, the operational efficiency of power supply and power system capacity.
Compare with cascaded inverter, in the situation that switching device is identical, the basic module quantity of modular multilevel converter is the twice of cascaded inverter, can connect more independent DC power supply, is conducive to improve the capacity of grid-connected system.
In the many power grids system based on modular multilevel converter,
When renewable energy source current is during as DC power supply, in order to make full use of regenerative resource, wish that the DC power supply of each basic module can both operate in maximum power point separately when system is normally moved;
When energy storage device is during as DC power supply, wish that each DC power supply, with identical state-of-charge (State-of-charge, SOC) operation, is conducive to make full use of the capacity of energy storage device like this.
Because, if the state-of-charge of energy storage device is inconsistent, in system running, some independent current sources may reach the limit value of operation, and other power supplys still can continue to discharge and recharge, be unfavorable for like this making full use of the capacity of energy storage device, all power supplys are conducive to make full use of the capacity of energy storage device with identical state-of-charge operation.
Traditional modular multilevel converter is mainly used in the middle of HVDC (High Voltage Direct Current) transmission system, and DC power supply is connected with unified direct-current chain.In traditional modular multilevel converter, alternate circulation mainly comprises DC component, second harmonic component, four-time harmonic component and high fdrequency component.In alternate circulation control strategy, conventionally the second harmonic component of alternate circulation, four-time harmonic component and high fdrequency component being controlled is zero.In the balanced control strategy of capacitance voltage, utilize the balanced capacitance voltage of DC component of alternate circulation.
Compare with traditional modular multilevel converter, in the middle of many power grids system, exist again some new problems to need to solve modular multilevel converter applications:
1,, in the many power grids system based on modular multilevel converter, generally the DC power supply output characteristic of each basic module is inconsistent.By suitable algorithm, made each DC power supply be operated in maximum power point or be operated in identical state-of-charge, by causing, the power output of each basic module is inconsistent.This will cause having DC component in grid-connected current, and the harmonic components of alternate circulation is also different from traditional modular multi-level converter, except comprising DC component, also comprise fundametal compoment and each harmonic component.The each harmonic component of alternate circulation can cause extra power loss, therefore need to the each harmonic component of alternate circulation, suppress by circulation control strategy.
2 and the power output DC component of each power model is main relevant with the DC component of circulation and the fundametal compoment of brachium pontis electric current.But the DC component of circulation can exert an influence to the MPPT maximum power point tracking of the balanced control of the SOC of battery energy storage system or renewable energy source current, so the DC component of circulation also needs to be suppressed.
3, in addition, different from traditional modular multilevel converter, the many power grids system based on modular multilevel converter is without balanced capacitance voltage.But the inconsistent meeting of DC power supply voltage causes in grid-connected current and has certain DC component, need to be suppressed.
Summary of the invention
Object of the present invention is exactly in order to address the above problem, a kind of many power grids system control method based on modular multilevel converter is provided, it has and can carry out MPPT maximum power point tracking control or the balanced control of SOC according to grid-connected power supply type, suppress the DC component existing in grid-connected current, can also control flexibly alternate circulation simultaneously, regulate the power output of each power model, thereby realize, MPPT maximum power point tracking is controlled and the balanced advantage of controlling of SOC.
To achieve these goals, the present invention adopts following technical scheme:
Many power grids system of modular multilevel converter refers to: using modular multilevel converter as energy converter, using renewable energy source current or energy-storage battery as DC power supply, disperse the grid-connected system forming in each basic module of access module multi-level converter.
Described in each, basic module comprises by DC power supply, electric capacity and two switching devices, described DC power supply and Capacitance parallel connection, and described two switching devices are one another in series, described electric capacity and two switching device parallel connections of connecting.
By each basic module of control switch device, the Energy Transfer of DC power supply can be gone out.
Described renewable energy source current comprises photovoltaic array, wind-driven generator or fuel cell, and described energy-storage battery comprises battery, energy accumulation device for fly wheel, superconducting magnetic energy storage or compression air energy-storing apparatus.
Many power grids system control method based on modular multilevel converter, comprises the steps: that the power control section of modular multilevel converter is divided generation sinusoidal modulation wave; Corresponding regulated quantity that described sine wave modulation ripple is controlled by DC power control, alternate circulation successively and grid-connected current DC component inhibitory control superposes, is finally modulated and is produced switching drive signal by phase-shifted SPWM.
Described DC power control is selected according to the type of DC power supply:
(1), when DC power supply is photovoltaic cell or other renewable energy source currents, DC power control is exactly that MPPT maximum power point tracking is controlled;
(2), when DC power supply is energy-storage battery, DC power control is exactly the balanced control of SOC.
Described MPPT maximum power point tracking is controlled: calculate the maximum power point of DC power supply, the duty ratio by by-pass cock device makes the power of the modules of modular multilevel converter can follow the trail of the maximum power point of DC power supply.
The balanced control of described SOC comprises: between each brachium pontis storage battery SOC equilibrium control, each phase upper and lower bridge arm, storage battery SOC is balanced controls and the balanced control of alternate storage battery SOC;
When the SOC of each brachium pontis storage battery is all in normal range of operation, only the SOC of each brachium pontis storage battery is carried out to equilibrium and control, it is zero that alternate circulation is controlled;
When the SOC of the storage battery of a certain brachium pontis or certain several brachium pontis approaches operation limit value, or when the SOC of the storage battery of a certain brachium pontis or certain several brachium pontis and other battery SOC difference are when larger, except controlling each brachium pontis storage battery SOC is balanced, also need storage battery SOC between each phase upper and lower bridge arm and alternate storage battery SOC to carry out equilibrium control, only retain the fundametal compoment of alternate circulation.
Described alternate circulation is controlled and is comprised: fundametal compoment suppresses, DC component suppresses and each harmonic component suppresses;
Without carrying out Power Exchange by alternate circulation, need to suppress fundametal compoment, each harmonic component and the DC component of alternate circulation under normal circumstances;
When needs carry out Power Exchange by alternate circulation, only the DC component of alternate circulation and each harmonic component are suppressed, utilize the fundametal compoment of alternate circulation to carry out Power Exchange.
Described grid-connected current DC component inhibitory control: calculate compensation rate according to the DC component in grid-connected current, this compensation rate is added in modulating wave, thereby suppress grid-connected current DC component.
Beneficial effect of the present invention:
1 is different from traditional modular multilevel converter, in traditional module multi-level converter, utilize the DC component of circulation to regulate the power output of each power model, realize the equilibrium of capacitance voltage.In the middle of the many power grids system based on modular multilevel converter, can utilize the fundametal compoment of alternate circulation to regulate the power output of each power model, thereby realize the SOC equilibrium of battery energy storage system or the MPPT maximum power point tracking of renewable energy source current.
2 in the many power grids system based on cascaded inverter, does not have alternate circulation, in the middle of the balanced control strategy of the MPPT maximum power point tracking of DC power supply and SOC, does not relate to the control of alternate circulation.Different with it, in the many power grids system based on modular multilevel converter, can control the power output that realizes power model by circulation and regulate, thereby realize, SOC is balanced to be controlled and MPPT maximum power point tracking is controlled.
, there is DC component in its grid-connected current in 3 many power grids systems based on modular multilevel converter, can pass through DC component inhibitory control, suppresses the DC component in grid-connected current, makes grid-connected current meet grid-connected requirement.
Accompanying drawing explanation
Fig. 1 (a) and Fig. 1 (b) are the energy-storage system topology diagram based on MMC;
Fig. 2 is control strategy the general frame;
Fig. 3 is MPPT maximum power point tracking control chart;
Fig. 4 is the balanced control block diagram of SOC;
Fig. 5 is circulation control block diagram;
Fig. 6 is grid-connected current DC component inhibitory control block diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Energy-storage system control strategy based on MMC is comprised of four parts: inverter power is controlled, and network source MPPT maximum power point tracking is controlled and the balanced control of SOC, and circulation is controlled, and grid-connected current DC component suppresses.Emphasis of the present invention is for the existing problem of many level grid-connected system based on MMC, suitable control strategy is proposed, according to the needs of the balanced control of SOC and MPPT maximum power point tracking control, circulation is controlled flexibly and is suppressed the DC component of grid-connected current.
As mentioned above, because circulation can cause power loss, do not wish under normal circumstances to carry out Power Exchange by alternate circulation, when needs utilize alternate circulation to carry out Power Exchange, utilize the fundametal compoment of alternate circulation to carry out Power Exchange.In the many power grids system based on modular multilevel converter, when DC power supply is renewable energy source current, carry out MPPT maximum power point tracking control, without carrying out Power Exchange by alternate circulation, therefore need to suppress fundametal compoment, each harmonic component and the DC component of alternate circulation under normal circumstances; When needs carry out Power Exchange by alternate circulation, only the DC component of alternate circulation and each harmonic component are suppressed, fundametal compoment is carried out to suitable control and carry out as requested Power Exchange.When DC power supply is energy storage device, only the DC power supply of each brachium pontis inside is carried out to the balanced control of SOC under normal circumstances, without carrying out Power Exchange by alternate circulation, therefore the DC component of alternate circulation, each harmonic component and fundametal compoment are suppressed; When the storage battery of some brachium pontis or certain several brachium pontis reaches operation limit value, to carry out Power Exchange by alternate circulation fundametal compoment, maintaining energy-storage system normally moves, therefore to carry out equilibrium and control carrying out storage battery SOC control and each storage battery SOC between mutually between each phase upper and lower bridge arm, by suitably controlling the fundametal compoment of alternate circulation, realize the Power Exchange between each phase simultaneously.
In traditional MMC, circulation only comprises DC component, second harmonic component, four-time harmonic component and high fdrequency component, wherein the DC component of circulation is for balanced capacitance voltage, so circulation is controlled, and only to need its second harmonic component, four-time harmonic component and high fdrequency component to suppress be zero; In the many DC power supply grid-connected system based on MMC, circulation comprises DC component, fundametal compoment and each harmonic component.As required, the fundametal compoment of circulation is for regulating the power stage of each power model.Described circulation control strategy need to be zero by the DC component in circulation and the inhibition of each harmonic component, according to need to controlling the fundametal compoment of circulation of Power Exchange.
Grid-connected current DC component suppression strategy, calculates compensation rate according to the DC component in grid-connected current, this compensation rate is superimposed upon in modulating wave, thereby reaches the object that suppresses grid-connected current DC component.
As Fig. 1 (a) is depicted as the many power grids system topology figure based on MMC.Each brachium pontis is comprised of N module.When MMC during as the energy converter of many power grids system independently DC power supply disperse to access each module, without unified DC power supply, so each module is comprised of 2 switch elements, 1 electric capacity, 1 group of DC power supply.As shown in Fig. 1 (b), when MMC is not used as the energy converter of energy-storage system, need unified direct-current chain to connect DC power supply or DC load, so each module only consist of 2 switch elements and 1 electric capacity.
The module of described modular multilevel converter can be considered to the elementary cell in MMC, these basic cell structures are on all four, each elementary cell is exactly a power model, such as indicating that frame of SM in Fig. 1 (a), it is exactly an elementary cell, in Fig. 1 (a), there is the expanded view of elementary cell in the upper right corner, by DC power supply, an electric capacity and two switching devices form, described DC power supply and Capacitance parallel connection, two switching device series connection, described electric capacity and two switching device parallel connections of connecting, by each elementary cell of switching device of controlling wherein, the Energy Transfer of DC power supply can be gone out, therefore an elementary cell is exactly a module.
Be illustrated in figure 2 control strategy the general frame, by inverter power control section, produce sinusoidal modulation wave and modulated and produced switching signal by phase-shifted SPWM, the balanced control of MPPT maximum power point tracking control/SOC, circulation control and grid-connected current DC component suppress to realize by the corresponding regulated quantity that superposes in modulating wave.
Be illustrated in figure 3 MPPT maximum power point tracking control strategy, calculate the maximum power point of DC power supply by suitable algorithm, the duty ratio by by-pass cock device makes the power of modules can follow the trail of the maximum power point of DC power supply.
Be illustrated in figure 4 the balanced control strategy block diagram of SOC, the balanced control strategy of SOC is comprised of three parts: each brachium pontis storage battery SOC is balanced to be controlled, and between each phase upper and lower bridge arm, storage battery SOC is balanced controls, and alternate storage battery SOC is balanced to be controlled.The storage battery SOC of each brachium pontis is balanced to be controlled alternate circulation impact littlely, but storage battery SOC is balanced between each phase upper and lower bridge arm, controls and balanced control of alternate storage battery SOC all needs to carry out Power Exchange by alternate circulation.Owing to carrying out Power Exchange by alternate circulation, can cause power loss, therefore conventionally not wish that energy-storage system has larger alternate circulation in normal course of operation.When the SOC of each brachium pontis storage battery is in normal range of operation, only each brachium pontis storage battery SOC is carried out to equilibrium control.When the approaching operation of the storage battery SOC of a certain brachium pontis or certain several brachium pontis limit value, need to carry out the balanced control of the balanced control of each phase upper and lower bridge arm storage battery SOC and alternate storage battery SOC.Like this, within homophase, can energy be transmitted to the lower brachium pontis of SOC by the higher brachium pontis of SOC by alternate circulation.In like manner, energy can transmit by alternate circulation between each phase.
Be illustrated in figure 5 circulation control block diagram, circulation control strategy is comprised of three parts: fundametal compoment is controlled, and DC component suppresses and each harmonic component suppresses.As mentioned above, while normally moving, without carrying out Power Exchange by alternate circulation, therefore alternate DC component, fundametal compoment and each harmonic component all being controlled is zero.When needs carry out Power Exchange by alternate circulation, by suitable control strategy, utilize the fundametal compoment of alternate circulation to carry out Power Exchange.
Be illustrated in figure 6 grid-connected current DC component inhibitory control block diagram.While controlling because DC power supply characteristic is inconsistent, carry out MPPT maximum power point tracking control and SOC is balanced, all can in grid-connected current, introduce DC component, this does not meet the grid-connected requirement of energy-storage system.Therefore to the DC component in grid-connected current be suppressed.According to the DC component in grid-connected current, calculate compensation rate, this compensation rate is superimposed upon in modulating wave, thereby reach the object that suppresses grid-connected current DC component.
In addition, in the middle of the many power grids system based on modular multilevel converter, alternate circulation can cause more power loss, and therefore, generally needing alternate circulation to control is zero.In this case, the balanced control of SOC can be carried out in each brachium pontis inside, but cannot balanced SOC between each brachium pontis and each phase.
Therefore, the balanced control of SOC is divided into two parts:
When battery SOC is all in normal range of operation, only each brachium pontis internal cell is carried out to the balanced control of SOC, it is zero that alternate circulation is controlled;
When part battery SOC approaches operation limit value or when larger with other battery SOC difference, all batteries are carried out to SOC is balanced to be controlled, only retain the fundametal compoment of alternate circulation.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.

Claims (6)

1. the many power grids system control method based on modular multilevel converter, is characterized in that, comprises the steps: that the power control section of modular multilevel converter is divided generation sinusoidal modulation wave; Corresponding regulated quantity that described sine wave modulation ripple is controlled by DC power control, alternate circulation successively and grid-connected current DC component inhibitory control superposes, is finally modulated and is produced switching drive signal by phase-shifted SPWM.
2. the many power grids system control method based on modular multilevel converter as claimed in claim 1, is characterized in that, described DC power control is selected according to the type of DC power supply:
(1), when DC power supply is photovoltaic cell or other renewable energy source currents, DC power control is exactly that MPPT maximum power point tracking is controlled;
(2), when DC power supply is energy-storage battery, DC power control is exactly the balanced control of SOC.
3. the many power grids system control method based on modular multilevel converter as claimed in claim 2, is characterized in that,
Described MPPT maximum power point tracking is controlled: calculate the maximum power point of DC power supply, the duty ratio of the switching device of the modules by adjustment module multi-level converter makes the power of the modules of modular multilevel converter can follow the trail of the maximum power point of DC power supply.
4. the many power grids system control method based on modular multilevel converter as claimed in claim 2, it is characterized in that, the balanced control of described SOC comprises: between each brachium pontis storage battery SOC equilibrium control, each phase upper and lower bridge arm, storage battery SOC is balanced controls and the balanced control of alternate storage battery SOC;
When the SOC of each brachium pontis storage battery is all in normal range of operation, only the SOC of each brachium pontis storage battery is carried out to equilibrium and control, it is zero that alternate circulation is controlled;
When the SOC of the storage battery of a certain brachium pontis or certain several brachium pontis approaches operation limit value, or when the SOC of the storage battery of a certain brachium pontis or certain several brachium pontis and other battery SOC difference are when larger, except controlling each brachium pontis storage battery SOC is balanced, also need storage battery SOC between each phase upper and lower bridge arm and alternate storage battery SOC to carry out equilibrium control, only retain the fundametal compoment of alternate circulation.
5. the many power grids system control method based on modular multilevel converter as claimed in claim 1, is characterized in that, described alternate circulation is controlled and comprised: fundametal compoment suppresses, DC component suppresses and each harmonic component suppresses;
Without carrying out Power Exchange by alternate circulation, need to suppress fundametal compoment, each harmonic component and the DC component of alternate circulation under normal circumstances;
When needs carry out Power Exchange by alternate circulation, only the DC component of alternate circulation and each harmonic component are suppressed, utilize the fundametal compoment of alternate circulation to carry out Power Exchange.
6. the many power grids system control method based on modular multilevel converter as claimed in claim 1, it is characterized in that, described grid-connected current DC component inhibitory control: calculate compensation rate according to the DC component in grid-connected current, this compensation rate is added in modulating wave, thereby suppresses grid-connected current DC component.
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