Impact of the RES on the operation of HPSPP Velebit

Transcription

1 Impact of the RES on the operation of HPSPP Velebit Generation Department

2 The aim of presentation Croatian strategic interest is building HPP and HPSPP (objects for centuries, need more: water and energy storage, ancillary services, flywheel of economy, acceptable price energy mix for the customers) Scheduling of HPSPP Velebit on market and providing ancillary services Growing needs of control reserves and balancing energy, necessity of regulation of too high voltages in operation (network 400 kv and 220 kv) Impact of obligatory accepting RES s generation, domestic conventional generation TPP (gas, coal) is consequently reduced or export (market ) Complex and frequently planning, more analysis of power system, generation and trade: market, consumption, network, ancillary services Additional requirement for HPP and HPSPP: reduced possibility for optimization, increase availability for regulation and pumping, increase of operation hours and numbers of starts units shoter lifetime Preparing market premium model for HPP+HPSPP, network fee and storage 2

3 Introduction some informations HPSPP Velebit Basic technical data HPSPP Velebot Energy indicators ( ) and indicators of providing ancillary services The impact of RES on the operation of electric power system and engagement of power plants RES and providing ancillary services Conclusion Agenda 3

4 Introduction some informations HPSPP Velebit HPSPP Velebit (in past name RHE Obrovac) is one of 23 HPP in HEP-Product. Weather conditions area Velebit: storm, strong winds bura, icing, blizzard Elevation m a.s.l.; rivers from Gračac s plateau: Ričica, Opsenica, Otuča i Krivak, upper accum. Štikada 13,5 mil. m 3 and Opsenica 2,7 mil. m 3 Location: 11,00 m a.s.l. power house, switchyard, lower accumul. Razovac in the river Zrmanja, 10 km upstream from town Obrovac, village Muškovci Built-up from 1978 to 1984 (2 generation unit); in operation from 1984, the most complex hydro object in Croatia with the most up-to-date equipment Included in the European architectural heritage for period century From 2007 it has TÜV certificate for green energy generation-in blu Registar The point of stability for southern branch of 400 kv ring N. Tesla and security of supply of Zadar area in power system emergency via line 110 kv Obr-ZD Only power plant conect on the 400 kv transmission grid; achieved specific operation state: island operation and start pumping form 35 kv level (2012) 4

5 Basic technical data - HPSPP Velebit Energy value of both upper accumulations 15 GWh, min/max operat. level =550,00 /553,50 ma.s.l. mean ann. inflow Q av =12 m 3 /s Preassure tunel m; penstock lenght m Two single-level Francis reversible turbines/pumps turbine: 30 m 3 /s, 140 MW; pump: 20 m 3 /s, 118 MW Two synchronous motor-generators rated power 155 MVA, power factor 0,89 generation mode: MW; pump mode: 2 120MW; 600 r/min Four different operation mode: TU, CTU, PU, CPU; 4 power transformer Network transformer 400/115/36,75 kv, 300/300/100 MVA, new TR 2012 Turbine and pump mode of operation is used for optimization of incomes and costs depending on hydrological conditions and volatility of mark. prices; Pump mode is used for energy storage; tertiary control for system balancing Frequent scheduling in compensation voltage reduction on 400 kv network Strategic interest step by step revitalization of primary and secondary equipment (more availability, more power P, more efficiency η) 5

6 Technical data single-line scheme two bus-bar system 400 kv; 4 voltage level: 400 kv, 110 kv, 35 kv,15,75 kv Start the pumps via line 35 kv Obr. during replacement TR 400/110/36,75kV Specific conditions during patriotic war,production on the occupied territories 6

7 PQ diagram 4 quadrants, each unit 7

8 Ancillary services structure in Croatia 2016/2017 ENTSO-E; Control block: SLO, CRO and BIH; Cont. area: Croatia Quantity and prices of services are regulated by HERA, Methodology 1) Secondary frequency control and power exchange(asr,total area) reserve power is agreed (range from ± 35 MW to ± 75 (65) MW), energy by real. 2) Tertiary control for system balancing (fast tertiary control) reserve power is agreed (range ± 120 MW), energy by real., k x reg. market price 3) Tertiary control for syst. security, Agreement within the contr. block reserve power is agreed ( MW, in MW), energy by realization 4) Compensation in operation - voltage regulation operation hours of HPSPP Velebit in compens. mode (agreed h/year/unit) 5) Black start and 6) Island operation availability of qualified generation units is agreed, start by activation Necessity: In future, recognition and pay service to the voltage control others power plants (for example: HPP Zakucac, TPP Plomin) 8

9 W [GWh] Operation data ( ) Electricity generation and consumption of HPSPP Velebit year Electricity generation Electricity consumption in pump and compensation mode Depending on: hydrological condition, the useful volume of the accumulation (basin capacity);multiannual average gener. 430 GWh 9

10 Q [GVArh] Operation data ( ) (2) Reactive energy consumption of HPSPP Velebit year Consumption of the reactive energy for voltage control has doubled in 5 year; usually load is too low in 400 kv grid, often we send MVArh/h from 400 kv Konjsko (CRO) to Mostar (BIH), be solved In past, dispetcher switch of 400 kv breaker Melina in HPSPP Veleb. Velebit Unit 1 Unit 2 Total 10

11 Operation data ( ) (3) Operation hours of HPSPP Velebit (both units) > h/year h year CPU PU CTU TU 11

12 Operation data ( ) (4) Numbers of starts of HPSPP Velebit CPU n PU CTU TU year Average equivalent operation hours, EOH h/unit, 1 start = 10 h 12

13 Operation data ( ) (5) MW, MWh Tertiary control provided by HPSPP Velebit ( /2016) January February March April May June July August month Balancing system [MW] System security [MW] Energy [MWh] Contribution of HPSPP Velebit in providing tertiary control reserves ( /2016): 5% for balancing system, 30% for system security from HEP portofolio 13

14 Installed power of WPPs [MW] Achieved generation of WPPs [Gwh] 450 Impact of RES on power system operation Installed power and achieved generation of WPPs , , , , , , Installed power of WPPs [MW] year Achieved generation of WPPs [GWh] About 85% of WPPs are connected on 110 kv, quota of WPP is about 740 MW in feed-in, all agreements were signed at the end of 2015 Result: more losses in network, need more ancillary services and storage 14

15 Impact of RES on power system operation (2) Total monthly generation [MWh] 2016 January February March April May June July August Plan Realization Difference Average hourly Plan generation [MWh/h] Realization Maximum hourly deviation [MWh/h] Positive Negative Absolute average hourly deviation [MWh/h] Maximum hourly deviation of WPP s generation in 2016 is significantly under/above agreed tertiary control reserve for system balancing; volatility of WPP: from 0 MW to 350 MW The increasing trend of average WPP s generation per installed MW is continued in 2016 > 800 GWh/year ( costs, 4 time RES fee) 15

16 Impact of RES on power system operation (3) Unfavorable impact of WPP on daily load curve (especially at night) Critical periods: workday from 00:00 till 06:00 and weekend at the same time generation of HPPs and WPPs with low consumption, OPPORTUNITY FOR NEW HPSPP RES displace generation from fossil fuels: usually natural gas and often reduce generation from coal Increasing maintenance costs, decreasing life-time, increasing failure risk, lower efficiency on lower loads Necessity of modification for AGC (HPP Dubrovnik, HPP Orlovac), Rescheduling of generation units because of the network s conditions is not agreed (occurs in practice), need agreement There is a question about generation costs for the final customer In Croatia, the price energy from WPP is 2,5-3 times more expencive than conventional TPP 16

17 RES and providing ancillary services (1-8/2016) Realization of required secondary control reserves > 96% SECONDARY CONTROL RESERVE ENERGY Month TSO needs Realization Realization Rsec- Rsec+ Rsec- Rsec+ Rsec- Rsec+ Wsec- Wsec+ Wsec- Wsec+ MW MW MW MW % % MWh MWh % % 01/ ,88% 88,16% ,97% 29,48% 02/ ,42% 96,66% ,00% 30,75% 03/ ,31% 99,47% ,70% 37,41% 04/ ,76% 100,25% ,59% 34,24% 05/ ,47% 97,84% ,79% 25,61% 06/ ,37% 98,03% ,10% 28,68% 07/ ,18% 97,77% ,93% 29,37% 08/ ,71% 99,76% ,25% 22,76% Total ,31% 96,94% ,51% 28,79% ,12% ,65% 17

18 RES and providing ancillary services (1-8/2016) Realization of required reserves of tertiary control for system balancing 100%; obligation of reducing the error of AGC on zero TERTIARY CONTROL FOR SYSTEM BALANCING RESERVE ENERGY Month TSO needs Realization Realization Rter- Rter+ Rter- Rter+ Rter- Rter+ Wter- Wter+ Wter- Wter+ MW MW MW MW % % MWh MWh % % 01/ ,22% 100,00% ,00% 18,94% 02/ ,85% 100,00% ,34% 12,99% 03/ ,04% 100,00% ,24% 14,06% 04/ ,98% 100,00% ,91% 15,94% 05/ ,01% 99,99% ,32% 20,10% 06/ ,80% 99,95% ,51% 24,33% 07/ ,00% 100,00% ,32% 12,56% 08/ ,00% 99,98% ,74% 8,51% Total ,62% 99,99% ,83% 15,92% ,30% ,37% 18

19 RES and providing ancillary services (3) HEP-Proizvodnja's incomes of providing ancillary services (2015), balncing 67% incomes (P + W) 0,6% 1,2% 11,4% secondary control tertiary control for system balancing 19,1% 35,9% tertiary control for system secure compensation operation of PSPP Velebit Black start 31,8% Island operation Significant share in cost of providing ancillary services has the cost of providing tertiary control for system balancing balancing the WPPs 19

20 Conclusion PSHPP Velebit only large PSHPP in the Republic of Croatia technical and economical weight; remaining potentials: storage water and PSHPP cost benefit analysis in HEP is required building new PSHPP and/or electric boilers in DHS (switch expensive gas with electricity consumption), Increasing share of RES needs and costs of balancing are higher importance in regulation for system balancing and check new acts group balance voltage in operation should be decreasing on the south part of 400 kv and 220 kv will be G-component for network fee (different between: economic pumping operation (scheduling producers) and when pumping uses for balansing system (at the request of dispatcher), need to develope regional market of ancillary services. Revision of development plans, valuation of RES and load s trend implementation of hourly planning of RES generation and participating in costs caused with deviations between scheduling and realization (production) contracting: ancillary serv. in distribution network, redispeching network-bottleneck applay the new Grid code, certification generation unit for providing ancillary serv. Inconsistent EU acts for pumping operation, differet network fee, harmonize acts implementation the higher RES share require market premium model for PSHPP 20

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22 Thank you! 22