technical due diligence for photovoltaic power plants-凯发k8国际首页登录

technical due diligence for photovoltaic power plants

pv power station technical due diligence refers to a series of investigations on the equipment quality, construction quality, power generation performance and potential risks of the target power station during the acquisition, investment and financing process. it is one of the most important links in the acquisition and merger process, and also an important risk prevention tool in the acquisition and operation process. in the process of investigation, professional experience and expert resources are usually used to form an independent perspective to evaluate the merits of merger & acquisition as a decision support for the management. from the perspective of the acquirer, due diligence is an indispensable means to deeply study the specific situation of the project and identify the investment value of the investment object. due diligence can help investors reduce risks and better obtain stable income, and also enable high-quality photovoltaic power plant assets to gain more attention in the transaction and financing links.

as a professional photovoltaic inspection, testing and certification service organization, noa has been approved by certification and accreditation administration of the people's republic of china (cnca) (cnca-r-2002-51), china national accreditation service for conformity assessment laboratory accreditation (cnasl11261) and inspection agency accreditation (cnas ib0786), china inspection body and laboratory mandatory approval (cma), can conduct independent and detailed due diligence on the technical design, aging, quality, safety and performance of photovoltaic systems, from project compliance data verification, project design evaluation, engineering construction quality, actual installed capacity, key equipment performance, power generation capacity evaluation and prediction, consumption, epc and other technical contract review, problems existing in the power station, defect repair plan, technical transformation cost input and income analysis, etc. deploy to provide clients with comprehensive technical due diligence investigation and assessment reports.

 

service content

as a professional third-party service organization for photovoltaic testing, noa has been approved by certification and accreditation administration of the people's republic of china (cnca) (cnca-r-2002-51), china national accreditation service for conformity assessment laboratory accreditation (cnasl11261) and china inspection body and laboratory mandatory approval (cma) accreditation. with the service experience of many power plant projects, noa provides technical due diligence of photovoltaic power plants, which aims to determine the functions of photovoltaic projects, help stakeholders balance the benefits and risks of investment, and evaluate the potential return on investment of power plants.

1. service content

1. on-site assessment

2. consistency assessment

3. power generation audit

4. design review

5. equipment failure inspection

6. inspection of key components

7. system efficiency assessment

8. pv power station data integrity check


2. reference standards


1. iec 62446-1:2016 amd1:2018 amendment 1 - photovoltaic (pv) systems - requirements for testing, documentation and maintenance - part 1: grid connected systems - documentation, commissioning tests and inspection 
2. cnca/cts 0004-2009a technical specification of  grid-connected pv inverter
3. cnca/cts 0016-2015 guideline of performance testing and quality assessment for grid-connected pv power plants
4. cnca/cts 0004-2010 basic acceptance requirements for grid-connected pv systems 
5. gb/t14549-1993 quality of electric energy supply--harmonics inpublic supply network 
6. gb/t 50796-2012 code for acceptance of photovoltaic power project 
7. gb 50794-2012 code for construction of pv power station 
8. gb 50797-2012 code for design of photovoltaic power station 
9. nb/t 32006-2013 test code for power quility of photovoltaic power station

service process
q&a
the photovoltaic power station system is composed of photovoltaic modules, inverters, combiner boxes, brackets and other components. if a problem occurs in one of the links, it will affect the operation of the power station, resulting in a loss of power generation, and a fire in severe cases.

1. how is the annual power generation standard method of photovoltaic power plants calculated?

calculation formula: ep=ha×paz×k÷g, where:

ep: on-grid power generation (kw h);

ha: total annual solar radiation on the horizontal plane (kw·h/m2);

paz: system installed capacity (kw);

g: standard test condition irradiance, 1000w/m2;

k: the comprehensive efficiency coefficient is a correction coefficient after considering the influence of various factors, including:

(1) pv module temperature correction coefficient;

(2) correction coefficients for the tilt angle and azimuth of the photovoltaic array;

(3) the stability of equipment operation and the availability of photovoltaic systems;

(4) light utilization rate;

(5) inverter efficiency;

(6) loss of collector line and step-up transformer;

(7) correction factor for surface contamination of photovoltaic modules;

(8) pv module power attenuation correction factor, etc.

this calculation method is the most comprehensive, but it is a challenge for non-senior photovoltaic practitioners to select an appropriate comprehensive efficiency coefficient. generally speaking, according to the actual situation of the project, the value of k is between 75%-85%.

2. how is the module area method for the annual power generation of photovoltaic power plants calculated?

calculation formula: ep=ha×s×k1×k2, where:

ha: total solar radiation on the inclined plane (kw·h/m2);

s: is the total area of ​​the module (m2);

k1: module conversion efficiency, generally calculated according to the declared value of the module factory;

k2: overall system efficiency.

the comprehensive efficiency coefficient k2 is a correction coefficient after considering the influence of various factors, including:

(1) plant electricity, line loss, etc.

the loss of ac and dc distribution rooms and transmission lines accounts for about 3% of the total power generation, and the corresponding reduction and correction factor is taken as 97%.

(2) inverter efficiency loss

the inverter efficiency is generally 95%~98%.

(3) operating temperature loss of photovoltaic modules

as the temperature of pv modules increases, their efficiency decreases. generally speaking, for every 1 degree increase in operating temperature of crystalline silicon photovoltaic modules, the power decreases by about 0.4%.

(4) loss of other factors

in addition to the above factors, other uncertain factors that affect the power generation of photovoltaic power plants include the loss of unusable solar radiation, the reduction of the maximum power point tracking accuracy, and the grid consumption. the corresponding reduction and correction factor is generally taken as 95. %.

this calculation method is a variation of the first method, and is suitable for projects with inclined angle installation, as long as the inclined surface irradiance is obtained (or converted according to the horizontal irradiance: inclined surface irradiance = horizontal surface irradiance/cosa) , more accurate data can be calculated.

3. how is the standard sunshine hours method for the annual power generation of photovoltaic power plants calculated?

calculation formula: ep=h×p×k1, where:

p: system installation capacity (kw);

h: local standard sunshine hours (h);

k1: the overall efficiency of the system (value 75%~85%).

this calculation method is also a variation formula of the first method, which is simple and convenient, and can calculate the daily average power generation, which is very practical. this method requires the estimator to know the local meteorological conditions.

our advantage
authoritative qualification
noa has been approved by certification and accreditation administration of the people’s republic of china(cnca)(cnca-r-2002-051), and has obtained qualification of china inspection body and laboratory mandatory approval (cma),and has passed the multiple approvals of china national accreditation service for conformity assessment (cnas), international accreditation service (ias), united kingdom accreditation service (ukas), joint accreditation system of australia and new zealand (jas-anz). noa has been approved by state administration for market regulation of china, and has been recognized as inspection and testing institution of china's special equipment, as well as the qualification of china's national equipment supervision and engineering supervision. noa-dci is the notified body of the ce directive of the european commission. noa has been recognized by the international electrotechnical commission (iecq) by obtaining electronic component quality assessment system. it is also a national inspection and assessment notified body of import and export commodity in china.noa is a high-tech enterprise in shanghai.
improve performance, realize asset value appreciation, and service throughout the entire value chain
from pre-design to post-operation, noa has the ability to guarantee the whole life cycle of the business. noa, as an independent third-party inspection company, has a large number of domestic and international standards and specifications proficient in design, welding, non-destructive testing, painting, packaging and other fields the experienced team of professional engineers and inspection experts, with more than ten years of experience in the domestic market, is familiar with all aspects of the domestic industrial equipment supply chain, and can provide you with technical support services for the full life cycle of technical services in a timely manner, combining various products. inspection, certification, testing, consulting, and auditing services can provide you with one-stop all-round comprehensive services.
quality, efficiency and service
noa has formed a mature and solid operation system in the development of more than 20 years. we let technical experts who are familiar with market regulations and testing standards and have professional industry experience to carry out inspection, evaluation and design review work. while meeting the requirements of domestic and international standards, we ensure that customers can obtain satisfactory service results in the first time with accurate time-sensitive management methods, and ensure that customers can seize the opportunity in the market competition.
service area
noa inspection services currently cover europe, australia, russia, some middle east regions and most regions in china. noa can ensure the consistency and continuity of customer service in different regions, and eliminate the impact of unfamiliar environments on customer quality. the guarantees and the impact of project implementation enable customers to participate in different markets across the country or around the world with flawless quality.
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