Endorsed Assignments from ERS Framework
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1 ERSTF Completion Endorsed Assignments from ERS Framework Ref Number Title ERS Recommendatio n Ongoing Responsibility 1 Synch Inertia at Interconnection Level Measure 2 Initial Frequency Deviation Measure 3 Synch Inertia at BA Level Measure 4 Freq Response at Interconnection Level Measure RS & FWG + MISO IDC SMEs + Rich Hydzik (other members in WI) + Julia Matevosyan (ERCOT) Current Data: EI IDC Data tentatively by June. WI RS to reach out to Peak RC ERCOT No Action HQ Francis Monette in RS data covered NERC IT Pooja Future Data: June Real Time Inertial Model Industry Practice BA 6 Net Demand Ramping Variability Measure RAS 7 Reactive Capability on the System Measure PAS & SAMS It is the output of Measure 3 results RAS Layne will bring it back to RAS for incorporation John will work with PAS to get granular data. John will socialize the Reactive White Paper with his subgroup and collect thoughts on future aspect RAS Meeting April PAS conference call Mar 24, Meeting April 6-7, and SAMS meeting May RELIABILITY ACCOUNTABILITY On going through Event
2 DERTF Work Plan 2/22/ What are Distributed Energy Resources? Brian Evans-Mongeon, Layne Brown, Sylvester Toe, Tony Jankowski, Gary Keenan a. Definitions i. Functional Model - NERC b. Behind the Meter Generation (BTMG) i. Size/scale ii. Net metering arrangements iii. Customer owned c. Distributed Generation (DG) i. Directly connected to utility distribution facilities ii. Interconnected generator resource d. Typical resources? Solar, small hydro, wind, what? ERS Meeting Update Brian designed a strawman for definitions. I would like to offer a cut at the definitions for BTMG and DG. I am suggesting a strong link to existing definitions in order to keep things relatively close to determinants like BES and such. BTMG: A generating unit or multiple generating units at a single location (regardless of ownership), of any nameplate size, on the customer s side of the retail meter that serve all or part of the customer s retail Load with electric energy. All electrical equipment from and including the generation set up to the metering point is considered to be behind-the-meter. DER: Resource(s) with gross individual nameplate rating less than or equal to 20 MVA or gross plant/facility aggregate nameplate rating less than or equal to 75 MVA including the generator terminals through the high-side of the step-up transformer(s) connected at a voltage of under 100 kv including interconnections with a utility s distribution facilities. What about storage? 2. How are Distributed Energy Resources connected? Sylvester Toe a. Low voltage BTMG NEC code and utility requirements b. Distributed Generation NESC and utility requirements 3. How are Distributed Energy Resources modeled? Jens Boemer, Gary Keenan, Barry Mather, Quoc Le, Dariush Shirmohammadi a. Distribution load is netted at source bus on present models b. Is it being modeled discretely anywhere? c. When does it become significant? 4. What are Distributed Energy Resources operating characteristics? Jason MacDowell, Rich Hydzik, Dariush Shirmohammadi a. IEEE 1547 Requirements 1
3 i. Now ii. Future b. Frequency and voltage ride through (pending NERC PRC-024-2) c. Active fault source? d. Can it run independently of utility connection? e. Smart or passive? f. Governor action 5. What effects to Distributed Energy Resources have on the Bulk Electric System (BES)? Tony Jankowski, Gary Keenan, Charlie Smith, Dariush Shirmohammadi a. Planning What is the net load? What is the peak load to serve? b. Operations MSSC how big is it? c. Negative distribution load? Flow up the transformer? Fault source? d. Balancing Authority Load i. DER nets with load from BA perspective ii. Steady or variable? iii. Predictable in BA load forecast? iv. How does it affect operating reserve requirements? e. X 6. Applicable NERC Reliability Standards Jason MacDowell, Gary Keenan a. MOD Steady State Data for Modeling and Simulation of Interconnected Transmission System b. MOD Dynamics Data for Modeling and Simulation of the Interconnected Transmission System c. MOD Documentation of Data Reporting Requirements for Actual and Forecast Demands, Net Energy for Load, and Controllable Demand-Side Management d. MOD Aggregated Actual and Forecast Demands and Net Energy for Load e. MOD Reporting of Interruptible Demands and Direct Control Load Management f. MOD Providing Interruptible Demands and Direct Load Control Management Data to System Operators and Reliability Coordinators g. MOD Documentation of the Accounting Methodology for the Effects of Demand- Side Management in Demand and Energy Forecasts h. MOD-031 is pending i. MOD-032 replaces MOD-010 j. MOD-033 replaces MOD-012 k. PRC-006 UFLS l. PRC-0?? UVLS schemes m. PRC-019 n. PRC (pending) Generator Voltage and Frequency Coordination 7. Recommendations a. Connection requirements b. Modeling 2
4 c. Performance requirements? d. Accounting Load/Gen? e. Modifications to any NERC Standards? 8. Membership 9. X 3
5 Transient Stability Analysis of an all Converter Interfaced Generation (CIG) WECC system Deepak Ramasubramanian Ph.D. Student Vijay Vittal John Undrill Arizona State University
6 Premise and assumptions Voltage source representation of the converter used All conventional generating units (2592 units) replaced by converter model of appropriate MVA rating Active power droop enabled on CIG when present on replaced conventional generating unit. Same value of droop coefficient used P max of converter assumed to be P max of turbine of replaced conventional generating unit 5% reactive power droop enabled on all CIG Terminal voltage control enabled on all CIG 2
7 Voltage source representation of the converter E d = V td0 + i d R f i q X f E q = V tq0 + i q R f + i d X f (1) 3
8 Voltage source representation of the converter R f and X f represent the resistance and reactance of the converter coupling filter and/or generation step up transformer between the converter and point of connection to the grid They have a value of 0.004pu and 0.05pu on a converter MVA base A steady state PWM amplitude modulation ratio (m) of 0.6 has been assumed. V T is the amplitude of the triangular carrier wave for generating the switching pulses 4
9 Control model Reactive power controller Active power controller 5
10 Features of control model Change in electrical frequency (Δω) calculated by rate of change of bus voltage angle Value of Q max adjusted according to change in terminal voltage while value of P max adjusted accordingly to maintain MVA of the converter Hard current trip at I max = 1.7pu Overvoltage trip if terminal voltage rises 0.15pu above the steady state voltage for more than 0.1s All time constants have a value of 0.01s except T frq which has a default software established value of 0.05s 6
11 System studied Simulation run on the WECC 2012 system: Number of buses: Number of conventional generating units: 2592 Number of induction motor loads: 5380 Around 90% of total load is voltage dependent. 7
12 Simulation results Five generating units across the system observed Plant E Five key buses identified across to system to observe the voltage Bus 2 Bus 1 Bus 5 Plant D Plant F The interaction between the northern and southern regions of the system studied Controller gains used: Bus 3 K p = 1.0, K i = 5.0 Generating units Key Buses Plant C Bus 4 Plant B Plant A K ip = 10.0, K iq = 10.0 K ip = 10.0, K iq = 120 (only for Plant A units) Simulations carried out in GE- PSLF 8
13 Generation outage Two of the three units at Plant A in Arizona tripped at t=15s. Loss of 2755 MW of generation 9
14 The frequency is calculated as rate of change of voltage phase angle 10
15 Analysis of results Arizona exports close to 4000 MW of power to California Large electrical separation between northern and southern regions of WECC 2755 MW generation outage causes phase angles to move away from each other in the first 0.5s after disturbance System separation prevented by increased inflow of power, due to droop control, from Northwest area to central northern California 11
16 Voltage at the key buses shows that as phase separation increases, the voltage at around the center of the north-south interface (Bus 3), decreases. 12
17 Total pre-disturbance active power generation is MW Total post-disturbance active power generation is MW 86.5% of the lost generation (due to trip of two Plant A units) is recovered through droop control Remaining 13.5% of the lost generation is recovered through voltage dependent loads 13
18 Third unit at Plant A is electrically closest to the outage Converter response to the outage is quick Converter current is within limits Voltage control loop brings the voltage back to the pre-disturbance value Very little reserve margin available as Plant A units operate close to their maximum active power limit 14
19 Effect of R p on generation outage With the trip of the two Plant A units, the system behavior with active power droop coefficient as 2R p and R p /2 has been observed Individual CIG units would still have different values of droop The droop coefficient in the previous study was considered to be R p 15
20 Active power droop coefficient was 2R p in this scenario. 16
21 Active power droop coefficient was R p /2 in this scenario. 17
22 Change in active power droop coefficient changes the settling time and final steady state value. Large value of droop coefficient corresponds to smaller proportional gain in the active loop and thus results in a longer settling time with greater oscillatory behavior. Simulation Metrics: With droop coefficient R p, a 40 second simulation run took 8.10 minutes with the first 20 seconds of simulation taking 3.52 minutes. Simulation time step: s Computer specifications: i7 processor, 16.0 gb of RAM. 18
23 DC voltage dip and subsequent recovery Assumption of a battery as a constant source of power for all units is not realistic Disturbance in the network would cause dc capacitor voltage to vary Magnitude of ac voltage produced by converter generally falls in proportion to its dc voltage Two units of Plant A tripped followed by a 10% reduction in dc voltage 0.02s later dc voltage gradually restored over the next 10s dc voltage reduced only in Arizona and Southern California 19
24 Drop in dc voltage does not increase the phase separation between the two areas. 20
25 The transient decrease in bus voltage is however greater when compared to the transient decrease with constant dc voltage 21
26 Analysis of results The dc voltage was reduced only in the southern region of the system Reduction in terminal voltage along with loss of generation, increases power flow along northsouth interfaced Increased power flow causes the voltage at the center to decrease With predominant voltage dependent load, continuous change in dc voltage (over a period of 10s after disturbance) causes load to continuously change and thus more pronounced oscillatory behavior 22
27 Line fault followed by outage Three phase fault applied at midpoint of a line between Arizona and Southern California areas Fault cleared and line tripped in 0.05s Initial flow of power on the line: MW and MVAR from the Arizona side Active power generation in both areas and behavior of one unit of Plant A observed 23
28 Arizona active power generation Southern California active power generation 24
29 Terminal voltage of one unit of Plant A Current of one unit of Plant A 25
30 Line closure Closure of a transmission line should not cause excessive current and voltage transients Power flow solved with major line open resulting in angle difference of between the buses to which the line was connected The line was closed during simulation 26
31 Current of a CIG unit located near the line Current of a CIG unit located one bus away 27
32 Conclusion An all CIG WECC system, if required, is viable The system operates in a stable manner for various contingencies Long proven principle of droop relationships works Important to consider the source behind the dc bus and incorporate its model into positive sequence simulations A coordinated well designed wide area control structure may also be required 28
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