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Adds timezone to Entsoe prices

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This commit is contained in:
Aart van Halteren
2022-01-19 15:52:20 +01:00
parent fca3fd401d
commit 99337c6045
2 changed files with 30 additions and 9 deletions
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29
app/models/entsoe.rb
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@@ -10,30 +10,32 @@ class Entsoe
URL = 'https://transparency.entsoe.eu'
attr_accessor :no_grid_charge_months
attr_accessor :no_grid_charge_months, :zone
attr_reader :storage_cost
def initialize(storage_cost = 0.05, api_key = "c2287e07-0c26-4950-b430-22b7f75a8f2e")
def initialize(zone = "Amsterdam", storage_cost = 0.05, api_key = "c2287e07-0c26-4950-b430-22b7f75a8f2e")
@api_key = api_key
@kwh_prices = {}
@storage_cost = storage_cost # how much does it cost to store 1 kwh in battery
@no_grid_charge_months = [5,6,7] # months where we assume there is enough surplus from sun power
@zone = zone
end
def price_at(formatted_hour)
unless @kwh_prices.key?(formatted_hour)
p "Fetching Entsoe tariffs for %s" % formatted_hour
@kwh_prices.merge!(query_day_ahead_prices(Date.parse(formatted_hour)))
prices = query_day_ahead_prices(Date.parse(formatted_hour))
@kwh_prices.merge!(hourly_format(prices))
end
@kwh_prices[formatted_hour]
end
def prices_at(date)
hour_start = date.beginning_of_day
hour_start = date.beginning_of_day.in_time_zone(@zone)
day_end = hour_start.advance(days: 1)
result = {}
while(hour_start < day_end) do
formatted_hour = hour_start.strftime("%F-%H")
formatted_hour = hour_start.strftime("%F %H")
result.merge!({ formatted_hour => price_at(formatted_hour)})
hour_start = hour_start.advance(:hours => 1)
end
@@ -79,6 +81,11 @@ class Entsoe
private
def hourly_format(prices)
# in memory hash @kwh_prices is in @zone timezone
prices.to_a.map{|p| [p[0].in_time_zone(@zone).strftime("%F %H"),p[1]]}.to_h
end
# get position and amount from XML snippet
# <Point>
# <position>1</position>
@@ -88,16 +95,20 @@ class Entsoe
# convert price to EUR per kwh, including VAT (21%)
#
def parse_point(xml)
return xml.children[1].text.to_i, ((xml.children[3].text.to_f/1000)*1.21).round(5)
return xml.xpath(".//xmlns:position").text.to_i, ((xml.xpath(".//xmlns:price.amount").text.to_f/1000)*1.21).round(5)
end
def base_request(date, url)
formatted_date = date.strftime("%F")
doc = Nokogiri::XML(URI.open(url))
prices = doc.xpath('.//xmlns:Point').map{|p| parse_point(p)}
#returns a hash with keys formatted "yyyy-mm-dd-hr" and values price (per kwh)
prices.map{|p| ["%s-%02d" % [formatted_date,(p[0]-1)], p[1]]}.to_h
prices = doc.xpath('.//xmlns:Point').map{|p| parse_point(p)}
# get start_time (in UTC) from XML docment
start_time = DateTime.parse(doc.xpath('.//xmlns:period.timeInterval//xmlns:start').text)
#returns a hash with keys formatted "yyyy-mm-dd hr" and values price (per kwh)
# <position> tag runs from 1-24. We need hours from 00-23, therefore substracting 1
prices.map{|p| [start_time.advance(hours: (p[0]-1)), p[1]]}.to_h
end
end