4 The Diffusion of Photovoltaics: Background, Modeling, Calibration and Implications for Government Policy Gary L. Lilien May 1978 MIT ENERGY LABORATORY REPORT - MIT-EL-78-019 PREPARED FOR THE UNITED STATES DEPARTMENT OF ENERGY Under Contract No. EX-76-A-01-2295 Task Order 37 Note: Charles Allen, Arnold Barnett, Pat Burns, Tom McCormick, Bruce Schweitzer, and Leif Soderberg contributed significantly to the material described in this paper. APPENDIX 1.1 A.l.1 PV PROGRAM A Users Guide to the Photovoltaics Simulation System The photovoltaics simulation system is a self-contained interactive set of computer programs on the Multics system at MIT; It allows the user to exercise the PV model for different sets of parameters by providing general facilities for creating, saving, editing, using, displaying and deleting sets of parameters. parameters reflects the model: The organization of these sets of the full set of input data is kept in a model, which contains parameters which apply across sectors, such as the cost decline factor, as well as the names of its constituent sectors. A sector, in turn, contains the data that are relevant only to itself, such as average PV installation size. Finally, when a model and its associated sectors are used to perform a simulation, the results are saved in a run, which records all the model and sector input data as well. The commands in the system are used to manipulate these three types of sets of data, or records. The actual model is defined by the following key variables and equations: Xit = number of kwatts of government PV installed in sector i during time t Yit = number of Kwatts of private PV installed in sector i during time t Ct = cost of one Kwatt of PV at the end of period t -195- *0 Zi = average number of Kwatts per PV installation in sector i Nit cummulative Kwatts of PV installed in sector i up to time t Nt = cumulative production of Kwatts of PV up to time t No = Kwatts of PV installed before model begins CO = cost per Kwatt of PV before model begins X = decimal factor by which cost declines when PV production doubles F () = cumulative normal distribution for cost acceptability, ci and aoc parameterized by Ci F (.) = cumulative normal distribution for successful installa SI and a tions acceptability, parameterized by pi i hi si = probability of purchase by randomly selected individual in sector i given acceptability Pio = Pt = total potential market for PV in sector i at time t Qi initial potential market for PV in sector i = potential original equipment PV installation that becoifies available per time period = growth rate of existing market potential in sector i The equations relating these variables are: t N - I (xi+Y T= -196- Nt = Pit = 1 F + N Nit (Pit-l-Qi)(l+gi) + Qi l(C 1) = probability that cost is acceptable at the beginning of period in sector i. F s. (N it- /Zi) = probability that installed PV is accept- i able in sector i at the beginning of period Yit = Ct = Co(Nt/No) t. it- Nit-1/Zi)(1-Fci(Ctt- )) Fsi(Nit-1/Zi) hi Zi g 2X These equations describe the model that is embodied in the simulation system. Tables I, II and II (for models, sectors and runs, respectively) show the correspondence between the variable names used here and the names as they appear in the computer programs and on the output. In use, the computer and the user exchange information through a computer terminal. There is a wide variety of computer terminals, which have various switches that must be properly set to communicate with Multics. After turning the terminal on, a COM/LCL switch should be on COM, a REMOTE/LOCAL switch on REMOTE, a FULL/HALF switch on HALF, a CONT MSG switch ON, and a speed switch on HIGH. Once the terminal is ready, you must "dial-up" the computer, that is, establish the telephone link between -197- it and your terminal. The phone number is 258-8215 for IBM 2741-like ter- minals and 258-8313 for ASCII-type terminals. The general procedure is to dial the number; you should get a high-pitched tone in response. Then, depending on the communication system used, push the DATA button or pull up the white button in the handset cradle or insert the handset into the acoustic coupler. with a two-line message. On 2741-like terminals, Multics will respond For ASCII-type terminals, you must type a speed identification character first, followed by a line-feed. Use "s" for 110-baud terminals (11 characters/second), "y" for 150-baud (15 cps) or "o" for 330-band (30 cps). message. Multics will then respond with its two-line Then type login SMcCormick and hit carriage return for 2741, line-feed for ASCII. You will then be prompted for the password; enter it, again followed by carriage return for 2741, line-feed for ASCII. After that, Multics will print some login messages and the simulation system's opening message will print. From this point on, everything you type on either kind of terminal should be terminated with a carriage return. The system will ask if you need the system explained (see attached sample terminal session). otherwise type "yes". If you are familiar with the system, type "no", The system expects the full word "yes" or "no" when- ever it asks you a question, though it generally assumes a "no" answer if anything other than "yes" is typed. If you answered "yes", a brief description of the commands will be printed. In either case, the system then prints "READY" as a signal that it is awaiting your first command. -198- If you mistype the You then type in the command that you want performed. command or type a non-existent command, the system will respond: The command XXX does not exist - try again with XXX replaced by the command you typed. valid command. You should then type in a After the command has finished processing (which may require that you type in information), the system again prints "READY" and awaits your next command. This cycle is terminated when you type the command: return which will stop processing and automatically log you off the computer. You will be informed of this by the message: You will now be disconnected from the computer. Goodbye. There may be circumstances when you don't want a command to finish an action it has started. For instance, you may start displaying some- thing that is longer than you thought. In any such situation, press the "quit" button on the terminal (which may be labeled "attn" or "break" on some terminals). Whatever the command is doing will stop, "QUIT" will be printed, and then "READY" will be printed to indicate that the next command may be entered. In certain situations an additional informational message in parentheses will be printed before "QUIT" to inform you of the status of the records that were being processed. Also, should an unfor- seen error arise, an error message will be printed containing information so the system maintainer can diagnose the error, followed by an artificially created quit signal to return you to command level. sages should be reported promptly to the system maintainer. Any error mes- There are general conventions that apply to all commands. The format in which they are typed is the command name followed by other information, separated by blanks. For instance, create model example would be used to create a model named example. The commands are flexi- ble though; in this example, "create" could be abbreviated to "cr", and any word beginning with "m" could be substituted for "model." Thus cr m example create mood example cr money example would all have the same effect as the previous example. In general, most commands have one or two letter abbreviations, and whenever the next field entered is a type ("model," "sector" or "run"), only the first letter is significant. allowed. All names are used as is with no abbreviation Different types of records are allowed to have the same name (i.e., you can have a model and a sector both named test), but two records of the same type must have different names. The programs check for this and give you a chance to re-enter a different name or overwrite the already existing record if you try (inadvertently or not) to use a duplicate name. You can also choose to "cancel" in such circumstances, which means that you are returned to command level as if you never entered the original command. record type, The programs check to see if you have entered a valid and prompt you if you haven't. cr x wrong -200- For example: i is answered by: First argument must be model or sector. Reenter: You can then type a word beginning with "m" or "s" and create the proper record. If you realize that you don't want to create anything, you can hit "quit" to return to command level. In addition, if you leave out arguments, the programs will prompt you for them. For example: cr model is answered by: Enter model name: Also several commands allow you to process several records of the same type at once. For instance: cr mood testl test2 test3 will create three models. The available commands are: create - creates models or sectors copy - copies models or sectors modify - modifies models or sectors delete - deletes models, sectors or runs display - displays models, sectors or runs run - runs a model creating a run index - lists records on file of a given type help - prints a brief description of command syntax return - terminates processing, logs you off --201- I The The last two commands are self-explanatory and have no arguments. other seven commands are described below. create: Syntax: create TYPE NAME1 NAME2 Abbreviation: cr TYPE: can be model or sector are 0 or more names of records to be created. NAMES: When this command is invoked it will successively prompt you for all the data items needed to create a model or sector. When the last item has been entered, a message is issued confirming that the record was created, then the next record (if any) is processed. copy: copy TYPE OLDNAME NEWNAME Syntax: Abbreviation: TYPE: cp can be model or sector OLDNAME: name of existing record which is to be copied NEWNAME: name that the copy is to saved under This command copies the record OLDNAME of the indicated TYPE under the name NEWNAME and issues a confirming message. Since the use of this command is frequently to have several versions of the same record with minor changes, you will then be asked if you want to modify the new record. Answering "yes" is equivalent to issuing the command "modify TYPE NEWNAME." -202- modify: Syntax: modify TYPE NAME1 NAME2 ... Abbreviation:m TYPE: can be model or sector NAMES: are 0 or more names of records to be modified When invoked, modify asks for your first subcommand. of subcommands is printed by typing "help." names of variables that can be changed. name. A dictionary Most subcommands are the To do this, enter the variable The program reports back the old value and asks for the new value. Then it prompts you for the next subcommand. There are also subcommands to display the modified record and to finish processing and return to command level. delete: Syntax: TYPE: NAMES: delete TYPE NAME1 NAME2 ... can be model, run or sector are 0 or more names of records to be deleted There is no abbreviation for delete, to avoid accidental deletions. For models and runs, delete checks the index to see if they have been run and displayed, respectively, and asks you to confirm whether you really want to delete these unused records or.not. printed after each deletion. -203- A confirming message is display: display TYPE NAME1 NAME2 ... Syntax: Abbreviation: TYPE: dp can be model, sector or run NAMES: are 0 or more names or records to be displayed This command prints the requested records on the terminal, one at a For a run, display asks you if you want model, sector, both or. time. neither input variables printed (again, only the first letter is significant, so "m", "s", "b" or "n" is sufficient), and give you the same choice for output variables. Successively answering "b", "b" will print every- thing, "n", "n" will print nothing, "s", "s" will print only sectorspecific input and output variables (which depend on model input variables however), etc. run: run MODELNAME RUNNAME Syntax: Abbreviation: r MODELNAME: RUNNAME: name of the model to be run name that the output will be saved under After the model is run, the program prints a confirming message and asks if you would like to have the run displayed. lent index: Answering yes is equiva- to issuing the command "display run RUNNAME". index TYPE Syntax: Abbreviation: TYPE: i can be model, sector, run or all -204- If TYPE is "all" or left blank, index prints a table of all records created and still on file giving their name, their type, and for models and runs, under the heading "Used?", an indication of whether they have been run and displayed yet. If TYPE is model, sector or run, a table restricted to only that type of record is printed with no type column but retaining the "Used" column. To clarify these ideas an annotated terminal session is attached, followed by a complete listing of the program. -YI d ,· . -205- TABLE I: Model Correspondences Symbolic Notation PL/I Variable Name Modify Mnemonic Name mname name Number of Sectors n n Number of time periods tmax tmax C0 initcost initcost Cost decay rate A costdecay costdecay Initial installed Kwatts of N0 initwatt initwatt sn(i) secname(i) govinv(i,t) govinv(i,t) English Concept Initial cost PV Name of sector i Government investment in sector i at time t Xit -206- TABLE II: English Concept Sector Correspondences Symbolic Notation Name Average PV installation size (Kwatts) Initial existing potential market (Kwatts) Z. PiO Growth rate of existing potential market Potential for original equipment installation per time period (Kwatts) Purchase probability given acceptance Mean of cost distribution Std. dev. of cost distribution Mean of successes distribution Std. dev. of successes distribution Qi h. 1 Pci PL/I variable name Modify mnemonic sname name avgsize avgsize initpotinst initpotin buildrate buildrate newinst newinst ppurch ppurch cmean costmean cdev costdev imean instmean idev instdev Ci Si1 Si 1 -207- b 0 U, 0 4C 0d ~ a) Iz 4-i 4-i 4w) Ca] U, Cd o 4.3 4J O 0 uC > O 4) > > -H k 4O . J 4 4J v% oO 4 O P. 4-i 0 0 Pd -v- I Q 0) Z I 6o U, C.) :-H 4J ' v I-n 10 H 0 0 . -I a) t, Pt 0 3 H 0 H Cd 4 4 %- c 4 H P oo - 4 t> o 4i -H 0 o > -H o0 0 > > 0 to P. H H H P' Hi CUt co Ci) ,H co EH 3 H H o o o ·r40 z ¢. cH~ FEI t r-i o 4-i y z 0 . 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C0'H *H -H 4-i 40 H 4d-H ) P>.H uH -H 0 r-I O U 1- ICd ,d- -209C bO'H : L) T- c rl *,1 Hd 0 U44 r.l 'H a) w 4-i 4i u uU) U) ct CL o o CU U 4- :j 0 4.JV J Q) z a) U -i V C-) a p-I ·raa 0 o4 U) HP1 4J oUo Uc 0 V 0 O uO :0) U a V) -i I 0 0 Cj O .rq >l N 4-i co 4-i -4 z0 H H N t C) .rq 1-q -H- 0 XH W4 z.r4 V 'H 'H I Hq U) 4-i 4J a) 4i >I g-40r 4i a) 0 U a) I> 'H 43 CtH V) a1) 4 d 04Pc 0 U H cl > H p-I H 0 -o 4H .rA -H wI (- 4 04I p- iC' CtabO 4 < o '-4 U) bo o a) J n r- O a) u 0a) 4 -) 4J -210- APPENDIX 2 FACTOR STRUCTURE COMPARISON: AGRICULTURAL SECTOR With Choffray and Lilien's [13] modification of the Chow test, when we compare the evaluation criteria of A against C at the evaluation of the combined group, (A + C). we must also look Actually, we are comparing A and C with (A + C) to determine equality; our null hypothesis is that the groups are, in fact, equal. N(1-R2) C Defining: X N-2q = nl(l-RP1)+ n 2 (1-R2 2 ) q where, 2 2 R' R2 = squared multiple correlations associated with the p1' p2 estimation of factor p in sample 1 and 2 respectively 2. R nl,,n2 = squared multiple correlation associated with factor p in pooled sample = number N = n q = number When the value of C of responses in sample 1 and 2 respectively + n2 of items exceeds the corresponding F statistic at the appropriate level of significance, the null hypothesis of equality is rejected. Group A = Pre-test and post-test survey Group B = pre-test survey only Group C = post-test survey only -211- APPENDIX 2 (continued) TABLE 1 For comparison of A and C: Factor C F p .90 . F 95 .F 99 1 0.41 1.72 2.01 2.75 2 0.42 1.72 2.01 2.75 3 1.79 1.72 2.01 2.75 null hypothesis is accepted at the .95 level TABLE 2 For comparison of B and C: Factor C p F .90 F. FF 95 99 1 2.62 1.72 2.01 2.75 2 2.53 1.72 2.01 2.75 3 0.22 1.72 2.01 2.75 null hypothesis is rejected at.the .95 level -212- APPENDIX 3: FACTOR STRUCTURE COMPARISON: RESIDENTIAL SECTOR TABLE 1 COMPARISON OF GROUP 1 AND GROUP 2 C Factor P F..g..9 0 F.9 5 F .9*7 1 5.76 1.72 2.01 2.75 2 10.58 1.72 2.01 2.75 3 3.34 1.72 -2.01 2.75 Null Hypothesis of equality is rejected COMPARISON OF GROUP 3 AND GROUP 4 C F. 9 0 F.9 5 F.99 0.94 1.72 2.01 2.75 2 2.42 1.72 2.01 2.75 3 1.24 1.72 2.01 2.75 Factor P Null Hypothesis is rejected at the .95 level -213- APPENDIX 3 (continued): TABLE 2 MODIFIED CHOW TEST COMPARISON OF GROUP 1 AND GROUP 4 C F F .90 F,9 5 2.44 1.72 2.01 2.75 2 . 3.72 1.72 2.01 2.75 3 -8.88 1.72 2.01 2.75 Factor P I .99 Null Hypothesis of equality is rej COMPARISON OF GROUP 2 AND GROUP 3 C p F.90 F.9 5 .95 F.99 .99 1 6.57 1.72 2.01 2.75 2 1.92 1.72 2.01 2.75 3 0.88 1.72 2.01 2.75 Factor Null Hypothesis of equality is rejected -214- A.4 Sample Interactive Program Session -215- . 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