CN106100517A - A kind of angle-style three-phase series formula photovoltaic plant energy storage mode control method - Google Patents

Abstract

A kind of angle-style three-phase series formula photovoltaic plant energy storage mode control method, under having illumination condition, angle-style three-phase series formula photovoltaic plant can not grid-connected work time, control the first and end short circuit of A, B, C every cross streams series unit outfan respectively, control n-th power model and be converted into input mode by the way of output, energy-storage battery group is reversely charged through n-th power model outfan by the output of First to the n-th 1 power model.And according to the power model series connection input power value of A cross streams series connection series unit, B cross streams series connection series unit and C cross streams series unit, and energy-storage battery group charge characteristic and charge voltage range, calculate the First of A, B, C every cross streams series unit to the output voltage apportioning cost of the n-th 1 power models, by n-th power model outfan photovoltaic arrays input power reversely inputted in the energy-storage battery group of correspondence and store；N is the integer of >=1.

Description

A kind of angle-style three-phase series formula photovoltaic plant energy storage mode control method

Technical field

The present invention relates to the control method of a kind of solar photovoltaic generation system.

Background technology

For adapting to the fast development of photovoltaic plant, star, angle-style complementary balanced tandem photovoltaic power station changes centralized, group String data electrification structure, it not only has, and output voltage is high, electric current is little, long transmission distance, grid balance, power network fluctuation and idle list The feature such as support mutually, and reduce conflux, the equipment such as transformator, reduce power plant construction and operating cost.But the mutual filling-in of angle-style Weighing apparatus tandem photovoltaic power station there is also certain shortcoming, when the limit power output of dispatching of power netwoks order request, and at low light level bar Under part, or when major part photovoltaic arrays is blocked, the output of photovoltaic arrays can not meet angle-style three-phase series formula photovoltaic electric Stand startup power time, the generated output of photovoltaic plant is not used effectively, and causes photovoltaic power station power generation power loss, i.e. industry Described abandons optical phenomenon.

Summary of the invention

The present invention seeks to overcome under having illumination condition, dispatching of power netwoks order limit power output, and prior art optical Volt square formation low-power output, the output of photovoltaic arrays can not meet the startup power of angle-style three-phase series formula photovoltaic plant Time, angle-style three-phase series formula photovoltaic plant cannot be grid-connected, and now photovoltaic arrays output can not be used effectively, and causes photovoltaic The shortcoming of power station generated output loss, proposes a kind of angle-style three-phase series formula photovoltaic plant energy storage mode control method.The present invention Under having illumination condition angle-style three-phase series formula photovoltaic plant can not grid-connected work time, by photovoltaic arrays input power storage, This process is referred to as energy storage mode of operation.

Under having illumination condition, angle-style three-phase series formula photovoltaic plant can not grid-connected work time, the present invention pass through angle-style three The grid-connected balance controller of star-angle type of the formula that is in series photovoltaic plant controls angle-style three-phase series formula photovoltaic plant and enters energy storage work Pattern, it may be assumed that the grid-connected balance controller of star-angle type controls A cross streams series unit, B cross streams series unit and C cross streams respectively The first and end short circuit of series unit outfan, controls n-th power model and is converted into input mode by the way of output, by first Corresponding energy-storage battery group is reversely charged through n-th power model outfan by platform to the output of (n-1)th power model. And according to the power model series connection of A cross streams series connection series unit, B cross streams series connection series unit and C cross streams series unit Input power value, and the energy-storage battery group charge characteristic of correspondence and charge voltage range, calculate A cross streams series string respectively The First of receipts or other documents in duplicate unit, B cross streams series connection series unit and C cross streams series unit is electric to the output of (n-1)th power model Pressure apportioning cost, is reversely inputted photovoltaic arrays input power in corresponding energy-storage battery group by n-th power model outfan Storage.

Described angle-style three-phase series formula photovoltaic plant is by A cross streams series unit, B cross streams series unit, C cross streams The grid-connected balance controller of series unit, star-angle type and three groups of energy-storage battery group compositions, have grid-connected and two kinds of mode of operations of energy storage.

A cross streams series unit, B cross streams series unit and C cross streams series unit are first by n platform power model outfan Tail is composed in series, and n is the integer of >=1.The input of every power model accesses photovoltaic group string, through power model MPPT maximum work Rate is followed the tracks of, DC/AC high_voltage isolation conversion output.Wherein First and n-th power model have discharge and recharge energy storage and control Loop, is connected with corresponding energy-storage battery group by charge and discharge control switch, has energy storage input, output function.

The end of A cross streams series unit is connected with the head end of B cross streams series unit, the end of B cross streams series unit End is connected with the head end of C cross streams series unit, and the end of C cross streams series unit connects with the head end of A cross streams series unit Connecing, composition angle-style connects, and each junction point is respectively as follows: U_b、U_c、U_a。U_a、U_b、U_cAlso it is angle-style three-phase series formula photovoltaic plant three Phase output terminal.Angle-style three-phase series formula photovoltaic plant three-phase output voltage is respectively A cross streams series unit, the series connection of B cross streams Unit, the first, last both end voltage difference of C cross streams series unit, respectively U_AB、U_BC、U_CA。

Three-phase output voltage value U of described angle-style three-phase series formula photovoltaic plant_AB、U_BC、U_CA, respectively A cross streams string Each power model output voltage sum in receipts or other documents in duplicate unit, B cross streams series unit and C cross streams series unit, it may be assumed that

$U_{AB}=\underset{n}{\overset{1}{\Σ}}{U}_a\left(n\right)=U_{a1}+U_{a2}+......+U_{an-1}+U_{an};U_{BC}=\underset{n}{\overset{1}{\Σ}}{U}_b\left(n\right)=U_{b1}+U_{b2}+......+U_{bn-1}+U_{bn};$

$U_{CA}=\underset{n}{\overset{1}{\Σ}}{U}_c\left(n\right)=U_{c1}+U_{c2}+......+U_{cn-1}+U_{cn}$

In formula, U_a1、U_a2..., U_an-1、U_anFor each power model output voltage in A cross streams series unit, U_b1、 U_b2..., U_bn-1、U_bnFor each power model output voltage in B cross streams series unit, U_c1、U_c2..., U_cn-1、 U_cnFor each power model output voltage in C cross streams series unit.

The grid-connected balance controller of described star-angle type is made up of A.C. contactor and tuning controller.And site three-phase alternating current Three groups of inputs of the chopper of outfan balance controller grid-connected with star-angle type are connected, three groups of outfans of chopper with exchange Three groups of normally open contacts of catalyst connect, three groups of moving contacts of A.C. contactor respectively with angle-style three-phase series formula photovoltaic plant Three-phase output end connect, namely respectively with A cross streams series unit, B cross streams series unit and the head of C cross streams series unit End connect, three groups of normally closed interlocks of A.C. contactor respectively with A cross streams series unit, B cross streams series unit and C cross streams The end of series unit connects.

The grid-connected balance controller of star-angle type controls, coordinates corresponding energy-storage battery group and A cross streams tandem unit, B phase AC series formula unit, C cross streams tandem unit, perform grid-connected, two kinds of mode of operations of energy storage.Grid-connected mode of operation exports Time, it is achieved the Large Copacity of angle-style three-phase series formula photovoltaic plant, high voltage, small area analysis, Differential Output；During energy storage mode of operation, A cross streams series unit, B cross streams series unit and C cross streams series unit photovoltaic arrays output are stored in three groups Energy-storage battery group, it is to avoid abandon optical phenomenon, is greatly improved power station generating efficiency.

Three groups of described energy-storage battery groups are the E_AB energy storage that A cross streams series unit shares with B cross streams series unit The E_BC energy-storage battery group that set of cells, B cross streams series unit share with C cross streams series unit, and C cross streams Series Sheet The E_CA energy-storage battery group that unit shares with A cross streams series unit.Three groups of the most corresponding every cross streams Series Sheets of energy-storage battery group Unit, for supplementing or storage power.

The step of angle-style three-phase series formula photovoltaic plant energy storage mode control method of the present invention is as follows:

(1) first step, when there being illumination, the grid-connected balance controller of star-angle type reads dispatching of power netwoks order and angle-style three in real time The input power data of each power model in the formula that is in series photovoltaic plant, judge whether dispatching of power netwoks order requires to limit merit respectively Rate exports, and whether the input power of every cross streams series unit starts more than or equal to angle-style three-phase series formula photovoltaic plant Performance number.When the input power judging dispatching of power netwoks order limit power output or every cross streams series unit is not more than or also When angle-style three-phase series formula photovoltaic plant starts performance number, the grid-connected balance controller of star-angle type controls A.C. contactor and is in often Closed state, angle-style three-phase series formula photovoltaic plant enters energy storage mode of operation, makes A cross streams series unit, B cross streams Series Sheet Unit and the output head end of C cross streams series unit and end connect；Simultaneously the grid-connected balance controller of star-angle type control respectively A intersect The first power model in stream series unit, B cross streams series unit and C cross streams series unit is to (n-1)th power model Series connection output, at (n-1)th power model and the connection end of the n-th power model, anti-through the outfan of the n-th power model Charge to corresponding E_AB, E_BC, E_CA energy-storage battery group；

When the grid-connected balance controller of star-angle type judges A cross streams series unit, B cross streams series unit or C cross streams string Every phase power model input power value sum in a wherein phase of receipts or other documents in duplicate unit or two-phase is less than star-like three-phase series formula photovoltaic electric Stand and start performance number P_qdTime, the grid-connected balance controller of star-angle type reads the storage volume of three groups of energy-storage battery groups the most respectively, and Judge whether the storage volume of three groups of energy-storage battery groups meets and supplement a corresponding phase or the performance number of two-phase alternating current series unit Requirement, as being unsatisfactory for, the grid-connected balance controller of star-angle type control A.C. contactor be in normally off, angle-style three-phase series formula Photovoltaic plant enters energy storage mode of operation, at A cross streams series unit, B cross streams series unit, C cross streams series unit (n-1)th power model and the connection end of the n-th power model, through the outfan of the n-th power model reversely to corresponding E_AB, E_ BC, E_CA energy-storage battery group is charged；

(2) second step, according to power mould in A cross streams series unit, B cross streams series unit, C cross streams series unit Block series connection input power value and the charge voltage range of corresponding energy-storage battery group, calculate A cross streams series unit, B respectively Cross streams series unit, C cross streams series unit First to the output voltage values of (n-1)th power model.

In the described first step, when there being illumination, the grid-connected balance controller of star-angle type reads dispatching of power netwoks life the most in real time Each power model data in order and angle-style three-phase series formula photovoltaic plant, first analyze, judge whether dispatching of power netwoks order limits Power exports, and in this way, then angle-style three-phase series formula photovoltaic plant is directly entered energy storage mode of operation, if not, calculate, analyze, Judge that whether the input power of every cross streams series unit is more than or equal to angle-style three-phase series formula photovoltaic plant startup performance number:

$P_{ia1}+P_{ia2}+......P_{ian-1}+P_{ian}=\underset{n}{\overset{1}{\Σ}}{P}_{ia}\left(n\right)\≥P_{qd}---\left(1\right)$

$P_{ib1}+P_{ib2}+......P_{ibn-1}+P_{ibn}=\underset{n}{\overset{1}{\Σ}}{P}_{ib}\left(n\right)\≥P_{qd}---\left(2\right)$

$P_{ic1}+P_{ic2}+......P_{icn-1}+P_{icn}=\underset{n}{\overset{1}{\Σ}}{P}_{ic}\left(n\right)\≥P_{qd}---\left(3\right)$

Wherein, P_ia1、P_ia2、P_ian-1、P_ianThe first power model that respectively A is in series in unit is defeated to the n-th power model Enter performance number；P_ib1、P_ib2、P_ibn-1、P_ibnThe first power model that respectively B is in series in unit inputs to the n-th power model Performance number；P_ic1、P_ic2、P_icn-1、P_icnThe first power model that respectively C is in series in unit is to the n-th power model input work Rate value；It is respectively A cross streams series unit, B cross streams series unit, C cross streams Power model input power value sum in series unit；P_qdFor angle-style three-phase series formula photovoltaic plant A cross streams series unit, B cross streams series unit, C cross streams series unit start performance number.

When in A cross streams series unit, B cross streams series unit and C cross streams series unit, power model input power Value sum both greater than or starts performance number P equal to angle-style three-phase series formula photovoltaic plant_qdTime, it may be assumed that The grid-connected balance controller of star-angle type controls A.C. contactor adhesive, and A cross streams is connected Unit, B cross streams series unit and the output of C cross streams series unit are grid-connected, make angle-style three-phase series formula photovoltaic plant enter also Net mode of operation.

Otherwise, it is judged that in A cross streams series unit, B cross streams series unit and C cross streams series unit, power model is defeated Enter whether performance number sum is both less than angle-style three-phase series formula photovoltaic plant startup performance number, it may be assumed that In this way, angle-style three-phase series formula photovoltaic plant enters energy storage mode of operation, it may be assumed that star angle The grid-connected balance controller of type controls A.C. contactor and is in normally off, makes A cross streams series unit, B cross streams series unit First, last outfan short circuit with in C cross streams series unit, disconnects with also site, and the dynamic point of A.C. contactor A phase connects with normally closed point Logical and normally opened disconnection；The dynamic point of B phase is connected and normally opened disconnection with normally closed；The dynamic point of C phase is connected and normally opened point with normally closed Disconnect.Owing to the n-th power model in A cross streams series unit, B cross streams series unit and C cross streams series unit has The input of energy storage power bi-directional, output function, thus the grid-connected balance controller of star-angle type controls A cross streams series unit, B phase respectively The first power model in AC series unit and C cross streams series unit is to (n-1)th power model, at (n-1)th power Module and the connection end of the n-th power model, through outfan and n-th charge and discharge control switch input, the output of the n-th power model End passes through the two directions' inputing of energy-storage battery group of correspondence, outfan more reversely to corresponding E_AB, E_BC, E_CA energy-storage battery group Charging, it may be assumed that

$P_{ia1}+P_{ia2}+......+P_{ian-1}=\underset{n-1}{\overset{1}{\Σ}}{P}_{ia}\left(n\right)=P_{abatt}---\left(4\right)$

$P_{ib1}+P_{ib2}+......+P_{ibn-1}=\underset{n-1}{\overset{1}{\Σ}}{P}_{ib}\left(n\right)=P_{bbatt}---\left(5\right)$

$P_{ic1}+P_{ic2}+......+P_{icn-1}=\underset{n-1}{\overset{1}{\Σ}}{P}_{ic}\left(n\right)=P_{cbatt}---\left(6\right)$

Wherein, P_abatt、P_bbatt、P_cbattIt is respectively A cross streams series unit, B cross streams series unit, the series connection of C cross streams Unit is in First to (n-1)th power model input power sum.

When in a cross streams series unit or two-phase alternating current series unit of angle-style three-phase series formula photovoltaic plant, often intersect The power model input power value sum of stream series unit is both less than angle-style three-phase series formula photovoltaic plant and starts performance number P_qdTime, As: if in A cross streams series unit and B cross streams series unit, the power model input power value of every cross streams series unit Sum is both less than angle-style three-phase series formula photovoltaic plant and starts performance number P_qd:

$\underset{n}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)<P_{qd},$

$\underset{n}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)<P_{qd},$

The grid-connected balance controller of star-angle type reads storage volume P of the energy-storage battery group of E_AB respectively_abatt×t_out、E_BC Storage volume P of energy-storage battery group_bbatt×t_out, storage volume P of energy-storage battery group of E_CA_cbatt×t_out, distinguish simultaneously Calculate above-mentioned A cross streams series unit and the input power of B cross streams series unitWithWith startup power Value P_qdDifference, it may be assumed that

$P_{qd}-\underset{n}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)={\mathrm{\&Delta;P}}_{abatt},$

$P_{qd}-\underset{n}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)={\mathrm{\&Delta;P}}_{bbatt};$

Judge this difference DELTA P_bbattWith Δ P_abattWhether sum stores up more than or equal to E_AB, E_BC, E_CA energy-storage battery group Deposit capacity sum (P_abatt+P_bbatt+P_cbatt)t_out, it may be assumed that

(P_abatt+P_bbatt+P_cbatt)t_out≥(ΔP_abatt+ΔP_bbatt)t₁₀

When judging (P_abatt+P_bbatt+P_cbatt)t_out≥(ΔP_abatt+ΔP_bbatt)t₁₀, star-angle type grid-connected balance controller control A.C. contactor adhesive processed, angle-style three-phase series formula photovoltaic plant enters grid-connected mode of operation, it may be assumed that A cross streams series unit, B The outfan of cross streams series unit and C cross streams series unit is grid-connected.Simultaneously according to electrical network demand power, star-angle type is grid-connected flat Weighing apparatus controller controls the two-way charge and discharge of first and n-th power model of A cross streams series unit, B cross streams series unit Loop, adjusts E_AB, E_BC, E_CA energy-storage battery group output, makes angle-style three-phase series formula photovoltaic plant realize balance defeated Go out.

Wherein, t_outFor E_AB, E_BC, E_CA energy-storage battery group power output time, unit is hour, t_out≥1/6；Δ P_abattPerformance number P is started for angle-style three-phase series formula photovoltaic plant_qdPerformance number is entered with power model in A cross streams series unit The difference of sum；ΔP_bbattPerformance number P is started for angle-style three-phase series formula photovoltaic plant_qdWith power in B cross streams series unit Module enters the difference of performance number sum；t₁₀For Δ P_abattWith Δ P_abattPower output time, unit is hour, t₁₀≥1/6。

When judging (P_abatt+P_bbatt+P_cbatt)t_out<(ΔP_abatt+ΔP_bbatt)t₁₀, the grid-connected balance controller of star-angle type is still Controlling A.C. contactor and be in normally off, angle-style three-phase series formula photovoltaic plant enters energy storage mode of operation, it may be assumed that A cross streams The first, last outfan short circuit of series unit, B cross streams series unit and C cross streams series unit, disconnects with also site, it may be assumed that A The first outfan of cross streams series unit and end outfan, connected, with normally opened point with normally closed by the dynamic point of A.C. contactor Disconnect；The first outfan of B cross streams series unit and end outfan, connected with normally closed by the dynamic point of A.C. contactor, with Normally opened disconnection；The first outfan of C cross streams series unit and end outfan, connect with normally closed point by the dynamic point of A.C. contactor Logical and normally opened disconnection.

The grid-connected balance controller of star-angle type controls A cross streams series unit, B cross streams series unit and C cross streams respectively The first power model in series unit to (n-1)th power model, in (n-1)th power model and the company of the n-th power model Connect end, through the outfan of the n-th power model, respectively by corresponding E_AB, E_BC, E_CA energy-storage battery group two directions' inputing, defeated Go out end reversely E_AB, E_BC, E_CA energy-storage battery group to be charged.

In described second step, by electrical power computing formula P=I × U and A cross streams series unit, B cross streams Series Sheet Power model in unit and C cross streams series unit is connected, and output electric current is equal to be understood, the power mould of every cross streams series unit Block output current value is respectively I_as、I_bs、I_cs；By power model A in A cross streams series unit₁、A₂、……、A_n-1Input power Value P_ia1、P_ia2、......、P_ian-1, power model B in B cross streams series unit₁、B₂、……、B_n-1Input power value P_ib1、 P_ib2、......、P_ibn-1, power model C in C cross streams series unit₁、C₂、……、C_n-1Input power value P_ic1、 P_ic2、......、P_icn-1；In substitution formula 4, formula 5 and formula 6:

P_ia1+P_ia2+、......、+P_ian-1=I_as(U_a1+U_a2+、....、+U_an-1) (7)

P_ib1+P_ib2+、......、+P_ibn-1=I_bs(U_b1+U_b2+、......、+U_bn-1) (8)

P_ic1+P_ic2+、......、+P_icn-1=I_cs(U_c1+U_c2+、......、+U_cn-1) (9)

Owing to the charge voltage range of E_AB energy-storage battery group, E_BC energy-storage battery group and E_CA energy-storage battery group is U_{batt_min}≤U_batt≤U_{batt_max}, make A cross streams series unit, B cross streams series unit and the output of C cross streams series unit Electric current I_as、I_bs、I_csThe charging current corresponding with E_CA energy-storage battery group equal to E_AB energy-storage battery group, E_BC energy-storage battery group I_abatt、I_bbatt、I_cbatt, it may be assumed that I_as=I_abatt、I_bs=I_bbatt、I_cs=I_cbatt；

Wherein, U_{batt_max}For energy-storage battery group maximum charging voltage value；U_{batt_min}For the minimum charging voltage of energy-storage battery group Value；U_battFor energy-storage battery group charging voltage value；I_abatt、I_bbatt、I_cbattIt is respectively A cross streams series unit, B cross streams string Receipts or other documents in duplicate unit, C cross streams series unit are to E_AB energy-storage battery group, E_BC energy-storage battery group and E_CA energy-storage battery group charging current Value.

Input power P according to E_AB energy-storage battery group_abatt, input power P of E_BC energy-storage battery group_bbattAnd E_CA Input power P of energy-storage battery group_cbatt, input voltage U_battAnd power model isolating transformer no-load voltage ratio η, calculate A phase respectively AC series photovoltaic cells, B cross streams tandem photovoltaic unit, C cross streams tandem photovoltaic unit First to (n-1)th power Block coupled in series output voltage values:

Due to:

$P_{abatt}=U_{batt}\&times;I_{abatt}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right),$

$P_{bbatt}=U_{batt}\&times;I_{bbatt}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right),$

$P_{cbatt}=U_{batt}\&times;I_{cbatt}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ic}\left(n\right)$

With:

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right),$

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right),$

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right),$

Understand:

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)=\mathrm{\&eta;}\&times;U_{batt},$

So:

$P_{abatt}=I_{as}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)/\mathrm{\&eta;}---\left(10\right);$

$P_{bbatt}=I_{bs}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)/\mathrm{\&eta;}---\left(11\right);$

$P_{cbatt}=I_{cs}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)/\mathrm{\&eta;}---\left(12\right)$

Respectively by formula 10, formula 11, formula 12 corresponding substitution formula 4, formula 5, formula 6:

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)=\mathrm{\&eta;}(P_{ia1}+P_{ia2}+,......,+P_{ian-1})/I_{as}---\left(13\right);$

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)=\mathrm{\&eta;}(P_{ib1}+P_{ib2}+,......,+P_{ibn-1})/I_{bs}---\left(14\right);$

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)=\mathrm{\&eta;}(P_{ic1}+P_{ic2}+,......,+P_{icn-1})/I_{cs}---\left(15\right);$

Thus, the grid-connected balance controller of star-angle type controls the First of three-phase alternating current series unit respectively to (n-1)th merit The output voltage apportioning cost of rate module, is respectively as follows:

A phase:

U_a1=η × P_ia1/I_as、U_a2=η × P_ia2/I_as、……、U_an-1=η × P_ian-1/I_as；

B phase:

U_b1=η × P_ib1/I_bs、U_b2=η × P_ib2/I_bs、……、U_bn-1=η × P_ibn-1/I_bs；

C phase:

U_c1=η × P_ic1/I_cs、U_c2=η × P_ic2/I_cs、……、U_cn-1=η × P_icn-1/I_cs。

Owing to being limited by the charge voltage range of energy-storage battery group, so A cross streams series unit, B cross streams Series Sheet The First of unit and C cross streams series unit is as follows to the output voltage values scope of (n-1)th power model:

$\mathrm{\&eta;}\&times;U_{batt\_min}\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max};$

$\mathrm{\&eta;}\&times;U_{batt\_min}\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max};$

$\mathrm{\&eta;}\&times;U_{batt\_min}\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max}.$

Angle-style three-phase series formula photovoltaic plant energy storage mode control method the most of the present invention, limits dispatching of power netwoks order to merit Rate output and photovoltaic arrays low-power output can not grid-connected power, by energy storage Schema control by generated output store, effectively profit With solar energy resources, photovoltaic power station power generation efficiency is made to be greatly improved, it is to avoid owing to electrical network limit power requirement makes photovoltaic plant cause Abandon optical phenomenon.The most well solving for many years due to photovoltaic output-power fluctuation characteristic, cause electrical network supply variation, electrical network is adjusted Degree has to take limit power output and limit the problem accessing electrical network at high proportion, improves the stability that electrical network is powered, to light Overhead utility accesses electrical network at high proportion and provides possibility.

Accompanying drawing explanation

Fig. 1 is angle-style three-phase series formula photovoltaic plant energy storage principles of pattern control block diagram；

Fig. 2 is angle-style three-phase series formula photovoltaic plant energy storage mode decision and control method flow chart；

Fig. 3 is A, B, C every cross streams series unit power model series connection output voltage distribution method flow chart.

Detailed description of the invention

The present invention is further illustrated below in conjunction with the drawings and specific embodiments.

As it is shown in figure 1, angle-style three-phase series formula photovoltaic plant is by A cross streams series unit, B cross streams series unit, C phase The grid-connected balance controller of AC series unit, star-angle type and three groups of energy-storage battery group compositions, have grid-connected and energy storage two kinds work Pattern.

Described A cross streams series unit, B cross streams series unit and C cross streams series unit are by n platform power model Outfan head and the tail are composed in series, and n is the integer of >=1.The input of every power model accesses photovoltaic group string, through power model MPPT maximal power tracing, DC/AC high_voltage isolation conversion output.Wherein First and n-th power model have charge and discharge Electricity energy storage control loop, First charge and discharge control switch input, outfan O_a1, O_b1, O_c1 respectively with E_AB energy storage Set of cells, E_BC energy-storage battery group and the two directions' inputing of E_CA energy-storage battery group, the corresponding company of output port E_a1, E_b1, E_c1 Connecing, the input of n-th charge and discharge control switch, outfan O_an, O_bn, O_cn store up with E_AB energy-storage battery group, E_BC respectively Energy set of cells and the two directions' inputing of E_CA energy-storage battery group, the corresponding connection of output port E_an, E_bn, E_cn, have energy storage defeated Enter, output function.

The end U of A cross streams series unit_anHead end U with B cross streams series unit_bConnect, B cross streams series unit End U_bnHead end U with C cross streams series unit_cConnect, the end U of C cross streams series unit_cnWith A cross streams Series Sheet The head end U of unit_aConnecting, composition angle-style connects.U_a、U_b、U_cAlso it is angle-style three-phase series formula photovoltaic plant three-phase output end.Angle-style Three-phase series formula photovoltaic plant three-phase output voltage is respectively A cross streams series unit, B cross streams series unit, C cross streams string The first, last both end voltage difference of receipts or other documents in duplicate unit, respectively U_AB、U_BC、U_CA。

Three-phase output voltage value U of described angle-style three-phase series formula photovoltaic plant_AB、U_BC、U_CA, respectively A cross streams string Each power model output voltage sum in receipts or other documents in duplicate unit, B cross streams series unit and C cross streams series unit, it may be assumed that

$U_a=\underset{n}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)=U_{a1}+U_{a2}+......+U_{an-1}+U_{an};U_b=\underset{n}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)=U_{b1}+U_{b2}+......+U_{bn-1}+U_{bn};$

$U_c=\underset{n}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)=U_{c1}+U_{c2}+......+U_{cn-1}+U_{cn}$

In formula, U_a1、U_a2..., U_an-1、U_anFor the power model A in A cross streams series unit₁、A₂..., A_n-1、A_nOutput voltage, U_b1、U_b2..., U_bn-1、U_bnFor power model B in B cross streams series unit₁、B₂..., B_n-1、B_nOutput voltage, U_c1、U_c2..., U_cn-1、U_cnFor power model C in C cross streams series unit₁、C₂..., C_n-1、C_nOutput voltage.

The grid-connected balance controller of described star-angle type is made up of A.C. contactor and tuning controller.And site three-phase alternating current Outfan respectively with chopper K_AD、K_BD、K_CDInput connect, chopper K_AD、K_BD、K_CDOutfan exchange with described respectively Three groups of normally open contact K of catalyst_A-3、K_B-3、K_C-3Connect, three groups of moving contact K of A.C. contactor_A-1、K_B-1、K_C-1Respectively with A The output head end U of cross streams series unit_a, the output head end U of B cross streams series unit_b, C cross streams series unit output first End U_cConnect, three groups of normally closed interlock K of A.C. contactor_A-2、K_B-2、K_C-2Respectively with the output end U of A cross streams series unit_an、B The output end U of cross streams series unit_bn, the output end U of C cross streams series unit_cnConnect.

The grid-connected balance controller of star-angle type controls, coordinates E_AB energy-storage battery group, E_BC energy-storage battery group and E_CA energy storage Set of cells and A cross streams tandem unit, B cross streams tandem unit, C cross streams tandem unit, make angle-style three-phase series Formula photovoltaic plant is in grid-connected and two kinds of mode of operations of energy storage.It is defeated that angle-style three-phase series formula photovoltaic plant is in grid-connected mode of operation When going out, it is possible to realize the Large Copacity of angle-style three-phase series formula photovoltaic plant, high voltage, small area analysis, Differential Output；Angle-style three-phase string When connection formula photovoltaic plant is in energy storage mode of operation, A cross streams series unit, B cross streams series unit and C cross streams are connected Unit photovoltaic arrays output is stored in E_AB energy-storage battery group, E_BC energy-storage battery group and the E_CA energy-storage battery group of correspondence In, it is to avoid abandon optical phenomenon, be greatly improved power station generating efficiency.

Three groups of described energy-storage battery groups be A with B cross streams series unit share E_AB energy-storage battery group, B with C intersect E_BC energy-storage battery group that stream series unit shares and the shared E_CA energy-storage battery group of C Yu A cross streams series unit.Three groups of storages The most corresponding every cross streams series unit of energy set of cells, for supplementary or storage power.

The step of angle-style three-phase series formula photovoltaic plant energy storage mode control method of the present invention is as follows:

(1) first step, when there being illumination, the grid-connected balance controller of star-angle type reads dispatching of power netwoks order and angle the most in real time A cross streams series unit, B cross streams series unit and the input of C cross streams series unit in type three-phase series formula photovoltaic plant Power dataWithAnd judge respectively dispatching of power netwoks order whether require limit power output and Whether the input power value of every cross streams series unit starts power P more than or equal to angle-style three-phase series formula photovoltaic plant_qdValue. When judging dispatching of power netwoks order limit power output or when A cross streams series unit, B cross streams series unit and the series connection of C cross streams The input power of unitIt is not more than or is also not equal to angle-style three-phase series formula photovoltaic plant Start power P_qdValue time, the grid-connected balance controller of star-angle type control A.C. contactor be in normally off, angle-style three-phase series Formula photovoltaic plant enters energy storage mode of operation, makes the output head end U of A cross streams series unit_aWith end U_an, B cross streams series connection The output head end U of unit_bWith end U_bnAnd the output head end U of C cross streams series unit_cWith end U_cnConnect；Star-angle type is also Net balance controller controls the first power model A of A cross streams series unit respectively₁To (n-1)th power model A_n-1Series connection Output, at (n-1)th power model A of A cross streams series unit_n-1With the n-th power model A_nConnect end, through the n-th power Modules A_nOutfan to charge and discharge control switch input, outfan O_an, then through E_AB energy-storage battery group two directions' inputing, output E_an end, reversely charges to E_AB energy-storage battery group；First power model B of B cross streams series unit₁To (n-1)th power Module B_n-1Series connection output, at (n-1)th power model B of B cross streams series unit_n-1With the n-th power model B_nEven Connect end, through the n-th power model B_nOutfan to charge and discharge control switch input, outfan O_bn, then through E_BC energy-storage battery Group two directions' inputing, output E_bn end, reversely charge to E_BC energy-storage battery group；The first power mould in C cross streams series unit Block C₁To (n-1)th power model C_n-1Series connection output, at (n-1)th power model C_n-1With the n-th power model C_nCompany Connect end, through the n-th power model C_nOutfan to charge and discharge control switch input, outfan O_cn, then through E_CA energy-storage battery Group two directions' inputing, output E_cn end, reversely charge to E_CA energy-storage battery group；

When the grid-connected balance controller of star-angle type judges A cross streams series unit, B cross streams series unit or C cross streams string A phase in receipts or other documents in duplicate unit or the every phase power model input power value sum in two-phase are less than angle-style three-phase series formula photovoltaic plant Start performance number P_qdTime, the grid-connected balance controller of star-angle type reads the storage volume of E_AB, E_BC, E_CA energy-storage battery group simultaneously P_abatt×t_out、P_bbatt×t_out、P_cbatt×t_out, and judge the storage volume sum of E_AB, E_BC, E_CA energy-storage battery group (P_abatt+P_bbatt+P_cbatt)t_outWhether meet the requirement of the performance number supplementing a phase or two-phase alternating current series unit, as discontented Foot, the grid-connected balance controller of star-angle type controls A.C. contactor and is in normally off, and angle-style three-phase series formula photovoltaic plant enters Energy storage mode of operation, the grid-connected balance controller of star-angle type control respectively the first power model of every cross streams series unit to n-th- The series connection output of 1 power model, respectively at (n-1)th power model A of A cross streams series unit_n-1With the n-th power Modules A_nConnection end, through the n-th power model A_nOutfan, then through E_AB energy-storage battery group two directions' inputing, output E_an end Reversely E_AB energy-storage battery group is charged；(n-1)th power model B at B cross streams series unit_n-1With the n-th power model B_n Connection end, through the n-th power model B_nOutfan, then through E_BC energy-storage battery group two directions' inputing, output E_bn end reverse E_BC energy-storage battery group is charged；(n-1)th power model C at C cross streams series unit_n-1With the n-th power model A_nCompany Connect end, through the n-th power model C_nOutput, then through E_CA energy-storage battery group two directions' inputing, output E_cn end reversely to E_CA Energy-storage battery group is charged.

(2) second step, according to the power model series connection input power of A cross streams series unitB cross streams string The power model series connection input power of receipts or other documents in duplicate unitThe power model series connection input power of C cross streams series unitValue, and E_AB energy-storage battery group, E_BC energy-storage battery group and the charge voltage range of E_CA energy-storage battery group U_{batt_min}≤U_batt≤U_{batt_max}, calculate the First power model A of A cross streams series unit respectively₁To (n-1)th power Modules A_n-1Output voltageB cross streams series unit B₁To (n-1)th power model B_n-1Output voltageAnd the First power model C of C cross streams series unit₁To (n-1)th power model C_n-1Output voltageValue.

As in figure 2 it is shown, the control method of the described first step is:

1., when there being illumination, the grid-connected balance controller of star-angle type reads dispatching of power netwoks order and angle-style three-phase string the most in real time The data of each power model in connection formula photovoltaic plant；

First analyze, judge whether dispatching of power netwoks order limits power output, in this way, then perform step and be 5. directly entered star Type three-phase series formula photovoltaic plant energy storage mode of operation, then perform step 9. turn every cross streams series unit power model series connection Output, the method flow to the distribution of energy-storage battery group charging voltage.

Otherwise whether 3. calculate, analyze, judge the input power of every cross streams series unit more than or equal to angle-style three-phase The startup power P in tandem photovoltaic power station_qdValue:

$P_{ia1}+P_{ia2}+......P_{ian-1}+P_{ian}=\underset{n}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)\&GreaterEqual;P_{qd}---\left(1\right)$

$P_{ib1}+P_{ib2}+......P_{ibn-1}+P_{ibn}=\underset{n}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)\&GreaterEqual;P_{qd}---\left(2\right)$

$P_{ic1}+P_{ic2}+......P_{icn-1}+P_{icn}=\underset{n}{\overset{1}{\&Sigma;}}{P}_{ic}\left(n\right)\&GreaterEqual;P_{qd}---\left(3\right)$

Wherein, P_ia1、P_ia2、P_ian-1、P_ianIt is respectively the first power model in A cross streams series unit to the n-th power mould Block input power value；P_ib1、P_ib2、P_ibn-1、P_ibnIt is respectively the first power model in B cross streams series unit to the n-th power Module input power value；P_ic1、P_ic2、P_icn-1、P_icnC phase goes here and there the first power model in exchange receipts or other documents in duplicate unit to the n-th power mould Block input power value；Be respectively A cross streams series unit, B cross streams series unit, The power model input power value sum of C cross streams series unit；P_qdPerformance number is started for angle-style three-phase series formula photovoltaic plant；

Judge when the power model input power value sum of A cross streams series unit, the power mould of B cross streams series unit The power model input power value sum of block input power value sum and C cross streams series unit both greater than or is equal to angle-style three-phase Startup performance number P in tandem photovoltaic power station_qdTime, it may be assumed thatThen Perform the step grid-connected balance controller of 8. star-angle type and control A.C. contactor adhesive, make A cross streams series unit, B cross streams string Receipts or other documents in duplicate unit and the output of C cross streams series unit are grid-connected, and angle-style three-phase series formula photovoltaic plant enters grid-connected mode of operation, otherwise holds Row step is 4.；

1. A cross streams series unit, B cross streams series unit and C cross streams series unit, every cross streams Series Sheet are judged Whether the power model input power value sum of unit is both less than angle-style three-phase series formula photovoltaic plant starts performance number, it may be assumed that

Such as the power model input work in A cross streams series unit, B cross streams series unit and C cross streams series unit Rate value sum is all not less than angle-style three-phase series formula photovoltaic plant and starts power P_qdValue, performs step 5. angle-style three-phase series formula light Overhead utility enter energy storage mode of operation, then perform step 9. turn every cross streams series unit power model series connection output, to storage The method flow of energy set of cells charging voltage distribution, on the contrary perform step 6.；

The grid-connected balance controller of star-angle type controls A.C. contactor and is in normally off, angle-style three-phase series formula photovoltaic plant Enter energy storage mode of operation, make the first, last in A cross streams series unit, B cross streams series unit and C cross streams series unit Outfan short circuit, disconnects with also site, it may be assumed that the first outfan of A cross streams series unit and end outfan, passes through A.C. contactor Dynamic some K_{ab_1}With normally closed some K_{ab_2}Connect and connect and and site A cross streams outfan by normally opened some K_{ab_3}Disconnect and from Net；The first outfan of B cross streams series unit and end outfan, by dynamic some K of A.C. contactor_{bc_1}With normally closed some K_{bc_2}Even Connect and connect and and site B cross streams outfan by normally opened some K_{bc_3}Disconnect and off-network；The head of C cross streams series unit is defeated Go out end and end outfan, by dynamic some K of A.C. contactor_{ca_1}With normally closed some K_{ca_2}Connect and connect and and site C cross streams Outfan passes through normally opened some K_{ca_3}Disconnect and off-network.The n-th power model A due to A cross streams series unit_n, B cross streams series connection N-th power model B of unit_nThe n-th power model C with C cross streams series unit_nThere is the input of energy storage power, output function, Thus the grid-connected balance controller of star-angle type is respectively at (n-1)th power model A of A cross streams series unit_n-1With the n-th power mould Block A_nConnection end, through the n-th power model A_nOutfan and the switch input of n-th charge and discharge control, outfan O_an, then lead to Cross the two directions' inputing of E_AB energy-storage battery group, the charging of outfan E_an reverse E_AB energy-storage battery group；At B cross streams series unit (n-1)th power model B_n-1With the n-th power model B_nConnection end, through the n-th power model B_nOutfan and n-th charge and discharge Electric control switch input, outfan O_bn, then stored up by the two directions' inputing of E_BC energy-storage battery group, the reverse E_BC of outfan E_bn Can set of cells charging；(n-1)th power model C at C cross streams series unit_n-1With the n-th power model C_nConnection end, warp N-th power model C_nOutfan, and the switch input of n-th charge and discharge control, outfan O_cn, then by E_CA energy-storage battery E_CA energy-storage battery group is reversely charged by the two directions' inputing of group, outfan E_cn.

$P_{ia1}+P_{ia2}+......+P_{ian-1}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)=P_{abatt}---\left(4\right)$

$P_{ib1}+P_{ib2}+......+P_{ibn-1}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)=P_{bbatt}---\left(5\right)$

$P_{ic1}+P_{ic2}+......+P_{icn-1}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ic}\left(n\right)=P_{cbatt}---\left(6\right)$

Wherein, P_abattFor the E_AB energy-storage battery group charge power value of A cross streams series unit, it it is First power model A₁To (n-1)th power model A_n-1Input power sum, P_bbattE_BC energy-storage battery group for B cross streams series unit is charged Performance number, is First power model B₁To (n-1)th power model B_n-1Input power sum, P_cbattFor C cross streams Series Sheet The E_CA energy-storage battery group charge power value of unit, is First power model C₁To (n-1)th power model C_n-1Input power it With；

2. when wherein a phase or the two-phase of A cross streams series unit, B cross streams series unit and C cross streams series unit The power model input power value sum of AC series unit starts performance number P less than angle-style three-phase series formula photovoltaic plant_qdTime, As: if the power model input power value sum of A cross streams series unitPower mould with B cross streams series unit Block input power value sumBoth less than angle-style three-phase series formula photovoltaic plant starts performance number P_qd:

$\underset{n}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)<P_{qd},$

$\underset{n}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)<P_{qd},$

The grid-connected balance controller of star-angle type reads storage volume P of E_AB energy-storage battery group respectively_abatt×t_out, E_BC storage Storage volume P of energy set of cells_bbatt×t_out, storage volume P of E_CA energy-storage battery group_cbatt×t_out, and calculate respectively simultaneously A cross streams series unit input powerB cross streams series unit input powerWith startup performance number P_qd Difference, it may be assumed that

$P_{qd}-\underset{n}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)={\mathrm{\&Delta;P}}_{abatt}$

$P_{qd}-\underset{n}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)={\mathrm{\&Delta;P}}_{bbatt};$

3. Δ P is judged_bbattWith Δ P_abattWhether sum stores appearance more than or equal to E_AB, E_BC, E_CA energy-storage battery group Amount sum (P_abatt+P_bbatt+P_cbatt)t_out,

That is: (P_abatt+P_bbatt+P_cbatt)t_out≥(ΔP_abatt+ΔP_bbatt)t₁₀

When judging (P_abatt+P_bbatt+P_cbatt)t_out≥(ΔP_abatt+ΔP_bbatt)t₁₀, star-angle type grid-connected balance controller control A.C. contactor adhesive processed, angle-style three-phase series formula photovoltaic plant enters grid-connected mode of operation, it may be assumed that A cross streams series unit First outfan U_aLast outfan U with C cross streams series unit_cn, by dynamic some K of A.C. contactor_{ab_1}With normally opened some K_{ab_3}Even Connect, connect with also site A cross streams outfan, a dynamic some K_{ab_1}With normally closed some K_{ab_2}Disconnect；The first output of B cross streams series unit End U_bLast outfan U with A cross streams series unit_an, by dynamic some K of A.C. contactor_{bc_1}With normally opened some K_{bc_3}Connect, with And the connection of site B cross streams outfan, a dynamic some K_{bc_1}With normally closed some K_{bc_2}Disconnect；The first outfan U of C cross streams series unit_cWith The last outfan U of B cross streams series unit_bn, by dynamic some K of A.C. contactor_{ca_1}With normally opened some K_{ca_3}Connect, with also site C cross streams outfan is connected, dynamic some K_{ca_1}With normally closed some K_{ca_2}Disconnect.Simultaneously according to electrical network demand power, the grid-connected balance of star-angle type The two-way charge and discharge of first and n-th power model that controller controls A cross streams series unit, B cross streams series unit are returned Road, adjusts E_AB energy-storage battery group, E_BC energy-storage battery group and E_CA energy-storage battery group output, makes angle-style three-phase series formula Photovoltaic plant realizes Differential Output.Wherein, t_outFor energy-storage battery group power output time, unit is hour, t_out≥1/6；Δ P_abattPerformance number P is started for angle-style three-phase series formula photovoltaic plant_qdWith A cross streams series unit power model input power value The difference of sum；ΔP_bbattPerformance number P is started for angle-style three-phase series formula photovoltaic plant_qdWith B cross streams series unit power mould The difference of block input power value sum；t₁₀For Δ P_abattWith Δ P_abattPower output time, unit is hour, t₁₀≥1/6。

When judging (P_abatt+P_bbatt+P_cbatt)t_out≥(ΔP_abatt+ΔP_bbatt)t₁₀, perform step 8., otherwise, star-angle type Grid-connected balance controller still controls A.C. contactor and is in normally off, performs step 5. angle-style three-phase series formula photovoltaic plant and enters Enter energy storage mode of operation, then perform step and 9. turn the power model series connection output of every cross streams series unit, to energy-storage battery group The method flow of charging voltage distribution.

As it is shown on figure 3, the side of the power model series connection output distribution voltage of described second step every cross streams series unit Method is as follows:

1. by electrical power computing formula P=I × U, and A cross streams series unit, B cross streams series unit, C cross streams string Power model in receipts or other documents in duplicate unit is connected, and output electric current is equal to be understood, and the power model output current value of every cross streams series unit divides Wei I_as、I_bs、I_cs；Power model A by A cross streams series unit₁、A₂、……、A_n-1Input power value P_ia1、 P_ia2、......、P_ian-1, the power model B of B cross streams series unit₁、B₂、……、B_n-1Input power value P_ib1、 P_ib2、......、P_ibn-1, the power model C of C cross streams series unit₁、C₂、……、C_n-1Input power value P_ic1、 P_ic2、......、P_icn-1, substitute in formula 4, formula 5 and formula 6:

P_ia1+P_ia2+、......、+P_ian-1=I_as(U_a1+U_a2+、....、+U_an-1) (7)

P_ib1+P_ib2+、......、+P_ibn-1=I_bs(U_b1+U_b2+、......、+U_bn-1) (8)

P_ic1+P_ic2+、......、+P_icn-1=I_cs(U_c1+U_c2+、......、+U_cn-1) (9)

Owing to E_AB energy-storage battery group, E_BC energy-storage battery group, the charge voltage range of E_CA energy-storage battery group are U_{batt_min}≤U_batt≤U_{batt_max}, make the output electric current of A cross streams series unit equal to E_AB energy-storage battery group charging current I_as =I_abatt, B cross streams series unit output electric current equal to E_BC energy-storage battery group charging current I_bs=I_bbattWith C cross streams The output electric current of series unit is equal to E_CA energy-storage battery group charging current I_cs=I_cbatt；

Wherein, U_{batt_max}For energy-storage battery group maximum charging voltage value；U_{batt_min}For the minimum charging voltage of energy-storage battery group Value；U_battFor energy-storage battery group charging voltage value；I_abatt、I_bbatt、I_cbattCorrespond to A, B, C every cross streams tandem photovoltaic respectively Unit is to E_AB energy-storage battery group, E_BC energy-storage battery group, E_CA energy-storage battery group charging current value.

2. according to input power P of E_AB energy-storage battery group_abatt, input power P of E_BC energy-storage battery group_bbatt、E_CA Input power P of energy-storage battery group_cbatt, input voltage U_battAnd power model isolating transformer no-load voltage ratio η, calculate A phase respectively The First of AC series unit is to (n-1)th power model A₁、A₂、……、A_n-1Series connection output voltage values, the series connection of B cross streams The First of unit is to (n-1)th power model B₁、B₂、……、B_n-1Series connection output voltage values, and C cross streams series unit First to (n-1)th power model C₁、C₂、……、C_n-1Series connection output voltage values:

Due to:

$P_{bbatt}=U_{batt}\&times;I_{bbatt}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right),$

$P_{cbatt}=U_{batt}\&times;I_{cbatt}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ic}\left(n\right);$

With:

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right),$

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right),$

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right),$

Understand:

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)=\mathrm{\&eta;}\&times;U_{batt},$

So:

$P_{abatt}=I_{as}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)/\mathrm{\&eta;}---\left(10\right);$

$P_{bbatt}=I_{bs}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)/\mathrm{\&eta;}---\left(11\right);$

$P_{cbatt}=I_{cs}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)/\mathrm{\&eta;}---\left(12\right);$

Respectively by formula 10, formula 11, formula 12 corresponding substitution formula 4, formula 5, formula 6:

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)=\mathrm{\&eta;}(P_{ia1}+P_{ia2}+,......,+P_{ian-1})/I_{as}---\left(13\right);$

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)=\mathrm{\&eta;}(P_{ib1}+P_{ib2}+,......,+P_{ibn-1})/I_{bs}---\left(14\right);$

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)=\mathrm{\&eta;}(P_{ic1}+P_{ic2}+,......,+P_{icn-1})/I_{cs}---\left(15\right);$

The most thus the grid-connected balance controller of star-angle type controls the First of three-phase alternating current series unit to (n-1)th power mould The output voltage values of block, is respectively as follows:

The First of A cross streams series unit is to (n-1)th power model A₁、A₂、……、A_n-1, every power model is defeated Go out magnitude of voltage to be respectively as follows:

U_a1=η × P_ia1/I_as、

U_a2=η × P_ia2/I_as、

……、

U_an-1=η × P_ian-1/I_as；

The First of B cross streams series unit is to (n-1)th power model B₁、B₂、……、B_n-1, every power model Output voltage values is respectively as follows:

U_b1=η × P_ib1/I_bs、

U_b2=η × P_ib2/I_bs、

……、

U_bn-1=η × P_ibn-1/I_bs；

The First of C cross streams series unit is to (n-1)th power model C₁、C₂、……、C_n-1, every power model Output voltage values is respectively as follows:

U_c1=η × P_ic1/I_cs、

U_c2=η × P_ic2/I_cs、

……、

U_cn-1=η × P_icn-1/I_cs；

4. limited due to the charge voltage range of energy-storage battery group, thus the First of every cross streams series unit to n-th- The output voltage values scope of 1 power model is as follows:

The First of A cross streams series unit to the output voltage values scope of (n-1)th power model is:

$\mathrm{\&eta;}\&times;U_{batt\_min}\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max};$

The First of B cross streams series unit to the output voltage values scope of (n-1)th power model is:

$\mathrm{\&eta;}\&times;U_{batt\_min}\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max};$

The First of C cross streams series unit to the output voltage values scope of (n-1)th power model is:

$\mathrm{\&eta;}\&times;U_{batt\_\min }\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max}.$

Claims (4)

1. an angle-style three-phase series formula photovoltaic plant energy storage mode control method, it is characterised in that described control method is: Under having illumination condition, angle-style three-phase series formula photovoltaic plant can not grid-connected work time, by angle-style three-phase series formula photovoltaic electric The grid-connected balance controller of star-angle type stood controls angle-style three-phase series formula photovoltaic plant and enters energy storage mode of operation, it may be assumed that star-angle type Grid-connected balance controller controls A cross streams series unit, B cross streams series unit and C cross streams series unit outfan respectively First and end short circuit, control n-th power model and be converted into input mode by the way of output, by First to (n-1)th power Corresponding energy-storage battery group is reversely charged by the output of module through n-th power model outfan；And according to A cross streams string The power model series connection input power value of connection series unit, B cross streams series connection series unit and C cross streams series unit, and Corresponding energy-storage battery group charge characteristic and charge voltage range, calculate A cross streams series connection series unit, B cross streams respectively The First of series connection series unit and C cross streams series unit is to the output voltage apportioning cost of (n-1)th power model, by the Photovoltaic arrays input power is reversely inputted in corresponding energy-storage battery group and stores by n platform power model outfan；N be >=1 whole Number.

2. according to the angle-style three-phase series formula photovoltaic plant energy storage mode control method described in claim 1, it is characterised in that institute Specifically comprising the following steps that of the control method stated

(1) first step, when there being illumination, the grid-connected balance controller of star-angle type reads dispatching of power netwoks order and angle-style three-phase string in real time The input power data of each power model in connection formula photovoltaic plant, judge whether dispatching of power netwoks order requires to limit power defeated respectively Go out, and whether the input power of every cross streams series unit starts power more than or equal to angle-style three-phase series formula photovoltaic plant Value；When the input power judging dispatching of power netwoks order limit power output or every cross streams series unit is not more than or is also not equal to angle When type three-phase series formula photovoltaic plant starts performance number, the grid-connected balance controller of star-angle type controls A.C. contactor and is in normally closed shape State, angle-style three-phase series formula photovoltaic plant enter energy storage mode of operation, make A cross streams series unit, B cross streams series unit and The output head end of C cross streams series unit and end connect；The grid-connected balance controller of star-angle type controls A cross streams string respectively simultaneously The first power model in receipts or other documents in duplicate unit, B cross streams series unit and C cross streams series unit is to the string of (n-1)th power model Connection output, at (n-1)th power model and the connection end of the n-th power model, the most right through the outfan of the n-th power model Corresponding E_AB, E_BC, E_CA energy-storage battery group charging；

When the grid-connected balance controller of star-angle type judges A cross streams series unit, B cross streams series unit or C cross streams Series Sheet Every phase power model input power value sum in a wherein phase of unit or two-phase opens less than star-like three-phase series formula photovoltaic plant Kinetic power value P_qdTime, the grid-connected balance controller of star-angle type reads the storage volume of three groups of energy-storage battery groups the most respectively, and judges Whether the storage volume of three groups of energy-storage battery groups meets wanting of the performance number of a supplementary corresponding phase or two-phase alternating current series unit Asking, as being unsatisfactory for, the grid-connected balance controller of star-angle type controls A.C. contactor and is in normally off, angle-style three-phase series formula photovoltaic Power station enter energy storage mode of operation, A cross streams series unit, B cross streams series unit, the (n-1)th of C cross streams series unit The connection end of individual power model and the n-th power model, through the outfan of the n-th power model reversely to corresponding E_AB, E_BC, E_ CA energy-storage battery group is charged；

(2) second step, according to power model string in A cross streams series unit, B cross streams series unit, C cross streams series unit Connection input power value and the charge voltage range of corresponding energy-storage battery group, calculate A cross streams series unit, B intersects respectively Stream series unit, C cross streams series unit First to the output voltage values of (n-1)th power model.

3. according to the angle-style three-phase series formula photovoltaic plant energy storage mode control method described in claim 2, it is characterised in that institute In the first step stated, when there being illumination, the grid-connected balance controller of star-angle type reads dispatching of power netwoks order and angle-style three the most in real time Each power model data in the formula that is in series photovoltaic plant, first analyze, judge whether dispatching of power netwoks order limits power output, as It is that then angle-style three-phase series formula photovoltaic plant is directly entered energy storage mode of operation, if not, calculates, analyze, judge often to be in series Whether the input power of unit is more than or equal to angle-style three-phase series formula photovoltaic plant startup performance number:

$P_{ia1}+P_{ia2}+\mathrm{......}{P}_{ian-1}+P_{ian}=\underset{n}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)\&GreaterEqual;P_{qd}---\left(1\right)$

$P_{ib1}+P_{ib2}+\mathrm{......}{P}_{ibn-1}+P_{ibn}=\underset{n}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)\&GreaterEqual;P_{qd}---\left(2\right)$

$P_{ic1}+P_{ic2}+\mathrm{......}{P}_{icn-1}+P_{icn}=\underset{n}{\overset{1}{\&Sigma;}}{P}_{ic}\left(n\right)\&GreaterEqual;P_{qd}---\left(3\right)$

Wherein, P_ia1、P_ia2、P_ian-1、P_ianThe first power model being respectively in A cross streams series unit is defeated to the n-th power model Enter performance number；P_ib1、P_ib2、P_ibn-1、P_ibnIt is respectively the first power model in B cross streams series unit to the n-th power model Input power value；P_ic1、P_ic2、P_icn-1、P_icnIt is respectively the first power model in C cross streams series unit to the n-th power mould Block input power value；Be respectively A cross streams series unit, B cross streams series unit, Power model input power value sum in C cross streams series unit；P_qdA cross streams string for angle-style three-phase series formula photovoltaic plant Receipts or other documents in duplicate unit, B cross streams series unit, C cross streams series unit start performance number；

When in A cross streams series unit, B cross streams series unit and C cross streams series unit, power model input power value it Performance number P is started with being both greater than or be equal to angle-style three-phase series formula photovoltaic plant_qdTime, it may be assumed that The grid-connected balance controller of star-angle type controls A.C. contactor adhesive, and A cross streams is connected Unit, B cross streams series unit and the output of C cross streams series unit are grid-connected, make angle-style three-phase series formula photovoltaic plant enter also Net mode of operation；

Otherwise, it is judged that power model input work in A cross streams series unit, B cross streams series unit and C cross streams series unit Whether rate value sum is both less than angle-style three-phase series formula photovoltaic plant starts performance number, it may be assumed that In this way, angle-style three-phase series formula photovoltaic plant enters energy storage mode of operation, it may be assumed that star angle The grid-connected balance controller of type controls A.C. contactor and is in normally off, makes A cross streams series unit, B cross streams series unit First, last outfan short circuit with in C cross streams series unit, disconnects with also site, and the dynamic point of A.C. contactor A phase connects with normally closed point Logical and normally opened disconnection；The dynamic point of B phase is connected and normally opened disconnection with normally closed；The dynamic point of C phase is connected and normally opened point with normally closed Disconnect.Owing to the n-th power model in A cross streams series unit, B cross streams series unit and C cross streams series unit has The input of energy storage power bi-directional, output function, thus the grid-connected balance controller of star-angle type controls A cross streams series unit, B phase respectively The first power model in AC series unit and C cross streams series unit is to (n-1)th power model, at (n-1)th power Module and the connection end of the n-th power model, through outfan and n-th charge and discharge control switch input, the output of the n-th power model End passes through the two directions' inputing of energy-storage battery group of correspondence, outfan more reversely to corresponding E_AB, E_BC, E_CA energy-storage battery group Charging, it may be assumed that

$P_{ia1}+P_{ia2}+\mathrm{......}+P_{ian-1}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)=P_{abatt}---\left(4\right)$

$P_{ib1}+P_{ib2}+\mathrm{......}+P_{ibn-1}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)=P_{bbatt}---\left(5\right)$

$P_{ic1}+P_{ic2}+\mathrm{......}+P_{icn-1}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ic}\left(n\right)=P_{cbatt}---\left(6\right)$

Wherein, P_abatt、P_bbatt、P_cbattIt is respectively A cross streams series unit, B cross streams series unit, C cross streams series unit In First to (n-1)th power model input power sum；

When in a cross streams series unit or two-phase alternating current series unit of angle-style three-phase series formula photovoltaic plant, every cross streams string The power model input power value sum of receipts or other documents in duplicate unit is both less than angle-style three-phase series formula photovoltaic plant and starts performance number P_qdTime, such as: If in A cross streams series unit and B cross streams series unit, the power model input power value sum of every cross streams series unit Both less than angle-style three-phase series formula photovoltaic plant starts performance number P_qd:

$\underset{n}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)<P_{qd},$

$\underset{n}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)<P_{qd},$

The grid-connected balance controller of star-angle type reads storage volume P of the energy-storage battery group of E_AB respectively_abatt×t_out, the storage of E_BC Storage volume P of energy set of cells_bbatt×t_out, storage volume P of energy-storage battery group of E_CA_cbatt×t_out, calculate the most respectively Above-mentioned A cross streams series unit and the input power of B cross streams series unitWithWith startup performance number P_qd Difference, it may be assumed that

$P_{qd}-\underset{n}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right)={\mathrm{\&Delta;P}}_{abatt},$

$P_{qd}-\underset{n}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right)={\mathrm{\&Delta;P}}_{bbatt};$

Judge this difference DELTA P_bbattWith Δ P_abattWhether sum stores appearance more than or equal to E_AB, E_BC, E_CA energy-storage battery group Amount sum (P_abatt+P_bbatt+P_cbatt)t_out, it may be assumed that

(P_abatt+P_bbatt+P_cbatt)t_out≥(ΔP_abatt+ΔP_bbatt)t₁₀

When judging (P_abatt+P_bbatt+P_cbatt)t_out≥(ΔP_abatt+ΔP_bbatt)t₁₀, the grid-connected balance controller of star-angle type controls to hand over Stream catalyst adhesive, angle-style three-phase series formula photovoltaic plant enters grid-connected mode of operation, it may be assumed that A cross streams series unit, B intersect The outfan of stream series unit and C cross streams series unit is grid-connected.Simultaneously according to electrical network demand power, star-angle type grid-connected balance control The two-way charge and discharge of first and n-th power model that device processed controls A cross streams series unit, B cross streams series unit are returned Road, adjusts E_AB, E_BC, E_CA energy-storage battery group output, makes angle-style three-phase series formula photovoltaic plant realize Differential Output；

Wherein, t_outFor E_AB, E_BC, E_CA energy-storage battery group power output time, unit is hour, t_out≥1/6；ΔP_abatt Performance number P is started for angle-style three-phase series formula photovoltaic plant_qdPerformance number sum is entered with power model in A cross streams series unit Difference；ΔP_bbattPerformance number P is started for angle-style three-phase series formula photovoltaic plant_qdEnter with power model in B cross streams series unit The difference of performance number sum；t₁₀For Δ P_abattWith Δ P_abattPower output time, unit is hour, t₁₀≥1/6；

When judging (P_abatt+P_bbatt+P_cbatt)t_out<(ΔP_abatt+ΔP_bbatt)t₁₀, the grid-connected balance controller of star-angle type still controls A.C. contactor is in normally off, and angle-style three-phase series formula photovoltaic plant enters energy storage mode of operation, it may be assumed that A cross streams is connected The first, last outfan short circuit of unit, B cross streams series unit and C cross streams series unit, disconnects with also site, it may be assumed that A intersects The first outfan of stream series unit and end outfan, connected with normally closed by the dynamic point of A.C. contactor, disconnects with normally opened； The first outfan of B cross streams series unit and end outfan, connected, with normally opened point with normally closed by the dynamic point of A.C. contactor Disconnect；The first outfan of C cross streams series unit and end outfan, by the dynamic point of A.C. contactor with normally closed connection and Normally opened disconnection；

The grid-connected balance controller of star-angle type controls A cross streams series unit, B cross streams series unit and the series connection of C cross streams respectively The first power model in unit to (n-1)th power model, at (n-1)th power model and the connection end of the n-th power model, Through the outfan of the n-th power model, anti-by E_AB, E_BC, E_CA energy-storage battery group two directions' inputing, the outfan of correspondence respectively Charge to E_AB, E_BC, E_CA energy-storage battery group.

4., according to the angle-style three-phase series formula photovoltaic plant energy storage mode control method described in Claims 2 or 3, its feature exists In, in described second step, by power model A in A cross streams series unit₁、A₂、……、A_n-1Input power value P_ia1、 P_ia2、......、P_ian-1, power model B in B cross streams series unit₁、B₂、……、B_n-1Input power value P_ib1、 P_ib2、......、P_ibn-1, power model C in C cross streams series unit₁、C₂、……、C_n-1Input power value P_ic1、 P_ic2、......、P_icn-1In substitution formula (4), formula (5) and formula (6):

P_ia1+P_ia2+、......、+P_ian-1=I_as(U_a1+U_a2+、....、+U_an-1) (7)

P_ib1+P_ib2+、......、+P_ibn-1=I_bs(U_b1+U_b2+、......、+U_bn-1) (8)

P_ic1+P_ic2+、......、+P_icn-1=I_cs(U_c1+U_c2+、......、+U_cn-1) (9)

Owing to the charge voltage range of E_AB energy-storage battery group, E_BC energy-storage battery group and E_CA energy-storage battery group is U_{batt_min}≤ U_batt≤U_{batt_max}, make the output electric current I of A cross streams series unit, B cross streams series unit and C cross streams series unit_as、 I_bs、I_csCharging current I corresponding with E_CA energy-storage battery group equal to E_AB energy-storage battery group, E_BC energy-storage battery group_abatt、 I_bbatt、I_cbatt, it may be assumed that I_as=I_abatt、I_bs=I_bbatt、I_cs=I_cbatt；

Wherein, U_{batt_max}For energy-storage battery group maximum charging voltage value；U_{batt_min}For the minimum charging voltage value of energy-storage battery group； U_battFor energy-storage battery group charging voltage value；I_abatt、I_bbatt、I_cbattIt is respectively A cross streams series unit, B cross streams Series Sheet Unit, C cross streams series unit are to E_AB energy-storage battery group, E_BC energy-storage battery group and E_CA energy-storage battery group charging current value；

Input power P according to E_AB energy-storage battery group_abatt, input power P of E_BC energy-storage battery group_bbattWith E_CA energy storage electricity Input power P of pond group_cbatt, input voltage U_battAnd power model isolating transformer no-load voltage ratio η, calculate A cross streams string respectively Connection photovoltaic cells, B cross streams tandem photovoltaic unit, C cross streams tandem photovoltaic unit First to (n-1)th power model string Connection output voltage values:

Due to:

$P_{abatt}=U_{batt}\&times;I_{abatt}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ia}\left(n\right),$

$P_{bbatt}=U_{batt}\&times;I_{bbatt}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ib}\left(n\right),$

$P_{cbatt}=U_{batt}\&times;I_{cbatt}=\underset{n-1}{\overset{1}{\&Sigma;}}{P}_{ic}\left(n\right)$

With:

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right),$

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right),$

$U_{batt}\&times;\mathrm{\&eta;}=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right),$

Understand:

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)=\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)=\mathrm{\&eta;}\&times;U_{batt},$

So:

$P_{abatt}=I_{as}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)/\mathrm{\&eta;}---\left(10\right);$

$P_{bbatt}=I_{bs}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)/\mathrm{\&eta;}---\left(11\right);$

$P_{cbatt}=I_{cs}\&times;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)/\mathrm{\&eta;}---\left(12\right)$

Respectively by formula (10), formula (11), the corresponding substitution formula (4) of formula (12), formula (5), formula (6):

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)=\mathrm{\&eta;}(P_{ia1}+P_{ia2}+,\mathrm{......},+P_{ian-1})/I_{as}---\left(13\right);$

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)=\mathrm{\&eta;}(P_{ib1}+P_{ib2}+,\mathrm{......},+P_{ibn-1})/I_{bs}---\left(14\right);$

$\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)=\mathrm{\&eta;}(P_{ic1}+P_{ic2}+,\mathrm{......},+P_{icn-1})/I_{cs}---\left(15\right);$

Thus, the grid-connected balance controller of star-angle type controls the First of three-phase alternating current series unit respectively to (n-1)th power mould The output voltage apportioning cost of block, is respectively as follows:

A phase:

U_a1=η × P_ia1/I_as、U_a2=η × P_ia2/I_as、……、U_an-1=η × P_ian-1/I_as；

B phase:

U_b1=η × P_ib1/I_bs、U_b2=η × P_ib2/I_bs、……、U_bn-1=η × P_ibn-1/I_bs；

C phase:

U_c1=η × P_ic1/I_cs、U_c2=η × P_ic2/I_cs、……、U_cn-1=η × P_icn-1/I_cs。

Owing to being limited by the charge voltage range of energy-storage battery group, so A cross streams series unit, B cross streams series unit and C The First of cross streams series unit is as follows to the output voltage values scope of (n-1)th power model:

$\mathrm{\&eta;}\&times;U_{batt\_min}\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_a\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max};$

$\mathrm{\&eta;}\&times;U_{batt\_min}\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_b\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max};$

$\mathrm{\&eta;}\&times;U_{batt\_min}\&le;\underset{n-1}{\overset{1}{\&Sigma;}}{U}_c\left(n\right)<\mathrm{\&eta;}\&times;U_{batt\_max}.$