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43-44 Definition of Design Parameters

Author: Source: Datetime: 2016-12-22 15:07:27
In the design of solar panel capacity calculation, the definition of the integrated coefficient, to be decomposed into multiple levels of the design parameters. These parameters can be used in the design of the final product can be used.

The basic design formula is expressed in terms of the amount of power generated, the design parameters of the power generation is of course given. It is necessary to calculate the accumulated value of the measured radiant intensity, the amount of power generation, and the like in a certain period. This period must be at least one year.

K=KHKPKBKC   also   K=KH*KPKBKC

Wherein
KH                  The correction coefficient of human radiation (based on solar panel surface radiation)
KH*                 The correction coefficient of the human radioactivity (based on the level of all-day radiation)
KHB                 From the level of solar radiation to the solar panel surface of the amount of radiation conversion factor;
KP                          Solar cell conversion efficiency correction factor;
KB                    Battery circuit correction factor;
KC                    Power regulator loop correction factor.


KH=KHDKHSKHC   also   K H*=KHGKHDKHSKHC

Wherein
KHD                     The correction coefficient of annual variation of solar radiation;
KHS                      Shading correction coefficient;
KHC                      Effective coefficient;
KHG                      Solar panels increase in the amount of the main factors, usually greater than 1.

KHC=KHCDKHCT


Wherein
KHCD                  Direct surface radiation coefficient;
KHCT                   Flat tracking gain coefficient.

KP=KPDKPTKPAKPM

Wherein
KPD                 Time - varying correction coefficient;
KPT                  Temperature correction coefficient;
KPA                  The correction coefficient of the panel circuit;
KPM                  Charge integration correction factor.
KPD=KPDSKPDDKPDR
Wherein
KPDS                        Correction coefficient of sewage erosion;
KPDD                   Correction factor;
KPDR                   Modification Coefficient of Response to Variation of Photovoltaic Power Generation.
KPDR=KPDRSKPDRN
Wherein
KPDRS          Spectral response variation correction coefficient;
KPDRN         Nonlinear Response Variation Correction Coefficient.
KPA=KPAUKPAL
Wherein
KPAU                     Combined circuit correction factor;
KPAL                             The loss correction factor of the panel circuit.

KB=(1-γBA)ηBD+γBAηBA

Wherein
γBA       Allowable discharge rate of battery;
ηBD       Bypass energy efficiency;

ηBA       Energy storage efficiency of battery end.



ηBA = KBOPηBTS


KBOP=KBSd KBur KBau ηBC

Wherein
KBOP            Battery operation comprehensive efficiency correction coefficient;
ηBTS                  Battery test efficiency;
KBOP            Self - discharge coefficient;
KBOP            Non - equilibrium charge factor;
KBOP            Auxiliary engine power reduction coefficient;
ηBC                     Charge and discharge control device efficiency.

KC=γDCKDD+(1-γDC) KIN

Wherein
γDC            DC discharge rate
KDD           Converter loop correction coefficient;
KIN            Modification Coefficient of Inverter Circuits.

KDD=ηDDO KDDC


Wherein
ηDDO         Converter efficiency;
KDDC         Converter output loop correction factor.

KIN=ηINO KACC


Wherein

ηINO                      Inverter Efficiency
KACC                    Inverter AC loop correction factor

KACC= KINAU KACC KACTR KACFT KACLN KACSA


Wherein
KINAU               The efficiency of the inverter output auxiliary circuit;
KACTR              Transformer efficiency;
KKACFT            Filter efficiency;
 KACLN                AC line efficiency of the inverter output to the load;
KACSA               Energy efficiency of the auxiliary power supply of the inverter output system.

The incident quantity correction coefficient KH is the main factor for reducing the solar radiation amount of the solar cell panel calculated from the weather observation data. The KHG solar panels is the main factor in the increase in the amount of radiation, usually greater than 1. Solar cell conversion efficiency correction factor KP, taking into account the standard state measured in the solar panel output power, in the field conditions there will be a variety of factors to reduce its value.

The correction factor KB of the battery circuit is defined by the energy efficiency in a certain period of time in consideration of the efficiency of the storage battery itself and the charging and discharging control loop.
In general, the definition of each design parameter, as shown in Figure 3-2 principle, is not usually used in the electrical output power, input power ratio, but a period () the ratio of energy, namely: Eout / Ein , this should pay special attention.

Eout  /  Ein  formula

Wherein


KX              Represents various design parameters 

Pin              Input power kW

Ein              Enter  the energy  KWh

Pout            Output Power kW
Eout            Output energy    kWh


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