powerio 0.3.2

Fast case parsing and conversion: "pandoc for power systems"
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290

use std::path::PathBuf;

use powerio::{
    SourceFormat, TargetFormat, parse_file, parse_pslf, parse_psse, parse_str,
    target_format_from_name, write_as, write_pslf,
};

const EPC: &str = r#"title
two bus
!
solution parameters
sbase 100.0000
!
bus data  [2] ty vsched volt angle ar zone vmax vmin date_in date_out pid L own st
1 "Slack       " 230.0000 : 0 1.0000 1.0000 0.0 1 1 1.1 0.9 400101 391231 0 0 1 0
2 "Load        " 230.0000 : 1 1.0000 1.0000 -1.0 1 1 1.1 0.9 400101 391231 0 0 1 0
branch data  [1] ck se long_id st resist react charge rate1 rate2 rate3 rate4 aloss lngth
1 "Slack       " 230.00 2 "Load        " 230.00 "1 " 1 "line" : 1 0.01 0.05 0.001 100 90 80 0 0 1 /
1 1 0 0
load data  [1] id long_id st mw mvar mw_i mvar_i mw_z mvar_z ar zone
2 "Load        " 230.00 "1 " "load" : 1 10 3 0 0 0 0 1 1
end
"#;

#[test]
fn parse_str_accepts_pslf_aliases() {
    for alias in ["pslf", "PSLF", "epc", "EPC", "pslf-epc", "Pslf_Epc"] {
        let parsed = parse_str(EPC, alias).unwrap();
        assert_eq!(parsed.network.source_format, SourceFormat::Pslf);
        assert_eq!(parsed.network.buses.len(), 2);
        assert_eq!(parsed.network.branches.len(), 1);
        assert_eq!(parsed.network.loads.len(), 1);
    }
}

#[test]
fn parse_file_infers_uppercase_epc_extension() {
    let path = temp_path("case.EPC");
    std::fs::write(&path, EPC).unwrap();

    let parsed = parse_file(&path, None).unwrap();

    assert_eq!(parsed.network.source_format, SourceFormat::Pslf);
    assert_eq!(
        parsed.network.source.as_deref().map(String::as_str),
        Some(EPC)
    );
}

#[test]
fn parse_file_accepts_case_insensitive_pslf_hint() {
    let path = temp_path("case.txt");
    std::fs::write(&path, EPC).unwrap();

    for hint in ["PSLF", "EPC", "Pslf_Epc"] {
        let parsed = parse_file(&path, Some(hint)).unwrap();
        assert_eq!(parsed.network.source_format, SourceFormat::Pslf);
    }
}

#[test]
fn pslf_is_a_write_target() {
    assert_eq!(target_format_from_name("pslf"), Some(TargetFormat::Pslf));
    assert_eq!(target_format_from_name("epc"), Some(TargetFormat::Pslf));
}

#[test]
fn pslf_write_read_round_trip_preserves_the_core() {
    // .epc → Network → .epc → Network keeps the power flow core. (The two-winding
    // transformer and ZIP load split exercise the multi-line record and the
    // replayed pslf_* extras.)
    let net0 = parse_pslf(EPC_WITH_TRANSFORMER).unwrap();
    let text = write_pslf(&net0).text;
    let net1 = parse_pslf(&text).unwrap();

    assert_eq!(net1.buses.len(), net0.buses.len());
    assert_eq!(net1.branches.len(), net0.branches.len());
    assert_eq!(net1.loads.len(), net0.loads.len());
    assert_eq!(net1.generators.len(), net0.generators.len());
    assert_eq!(net1.shunts.len(), net0.shunts.len());

    let sum = |xs: &[f64]| xs.iter().sum::<f64>();
    let p0 = sum(&net0.loads.iter().map(|l| l.p).collect::<Vec<_>>());
    let p1 = sum(&net1.loads.iter().map(|l| l.p).collect::<Vec<_>>());
    assert!((p0 - p1).abs() < 1e-9, "load P changed: {p0} != {p1}");
    // The transformer survives the round trip with its tap.
    let tap0 = net0
        .branches
        .iter()
        .find(|b| b.is_transformer())
        .unwrap()
        .tap;
    let tap1 = net1
        .branches
        .iter()
        .find(|b| b.is_transformer())
        .unwrap()
        .tap;
    assert!((tap0 - tap1).abs() < 1e-9, "tap changed: {tap0} != {tap1}");
}

#[test]
fn pslf_same_format_write_echoes_source() {
    // A PSLF-sourced network writes back byte-for-byte through the retained source.
    let parsed = parse_str(EPC, "pslf").unwrap();
    assert_eq!(
        write_as(&parsed.network, TargetFormat::Pslf).unwrap().text,
        EPC
    );
}

#[test]
fn pslf_write_reports_dropped_transformer_control() {
    // A PSS/E regulating transformer carries control the .epc record can't hold,
    // so the PSLF writer must report the loss rather than drop it silently.
    let raw = "0, 100.00, 33, 0, 0, 60.00 / x\nCASE\nCOMMENT\n\
        1,'B1          ', 230.0,3,1,1,1,1.0,0.0,1.1,0.9,1.1,0.9\n\
        2,'B2          ', 138.0,1,1,1,1,1.0,0.0,1.1,0.9,1.1,0.9\n\
        3,'B3          ', 13.8,1,1,1,1,1.0,0.0,1.1,0.9,1.1,0.9\n\
        0 / END OF BUS DATA, BEGIN LOAD DATA\n\
        0 / END OF LOAD DATA, BEGIN FIXED SHUNT DATA\n\
        0 / END OF FIXED SHUNT DATA, BEGIN GENERATOR DATA\n\
        0 / END OF GENERATOR DATA, BEGIN BRANCH DATA\n\
        0 / END OF BRANCH DATA, BEGIN TRANSFORMER DATA\n\
        1, 2, 0, '1', 1, 1, 1, 0, 0, 2, 'REG         ', 1, 1, 1, 0, 1, 0, 1, 0, 1, '            '\n\
        0.01, 0.10, 100.0\n\
        1.025, 0, 2.5, 100.0, 90.0, 80.0, 1, 3, 1.08, 0.92, 1.05, 0.98, 17, 0, 0, 0, 0\n\
        1.0, 0\n\
        0 / END OF TRANSFORMER DATA, BEGIN AREA DATA\nQ\n";
    let net = parse_psse(raw).unwrap();
    assert!(net.branches[0].control.is_some());

    let conv = write_pslf(&net);
    assert!(
        conv.warnings
            .iter()
            .any(|w| w.contains("regulating control")),
        "expected a control-drop warning, got {:?}",
        conv.warnings
    );
}

#[test]
fn pslf_write_reports_dropped_generator_regulated_bus() {
    // A PSS/E generator regulating a remote bus (IREG ≠ its own) carries a target
    // the .epc generator record can't express, so the writer must report the loss.
    let raw = "0, 100.00, 33, 0, 0, 60.00 / x\nCASE\nCOMMENT\n\
        1,'B1          ', 230.0,3,1,1,1,1.0,0.0,1.1,0.9,1.1,0.9\n\
        2,'B2          ', 18.0,2,1,1,1,1.0,0.0,1.1,0.9,1.1,0.9\n\
        7,'B7          ', 230.0,1,1,1,1,1.0,0.0,1.1,0.9,1.1,0.9\n\
        0 / END OF BUS DATA, BEGIN LOAD DATA\n\
        0 / END OF LOAD DATA, BEGIN FIXED SHUNT DATA\n\
        0 / END OF FIXED SHUNT DATA, BEGIN GENERATOR DATA\n\
        2,'1', 50.0, 5.0, 30.0, -20.0, 1.02, 7, 100.0, 0, 1, 0, 0, 1, 1, 100.0, 80.0, 0.0, 1, 1\n\
        0 / END OF GENERATOR DATA, BEGIN BRANCH DATA\n\
        0 / END OF BRANCH DATA, BEGIN TRANSFORMER DATA\n\
        0 / END OF TRANSFORMER DATA, BEGIN AREA DATA\nQ\n";
    let net = parse_psse(raw).unwrap();
    assert_eq!(net.generators[0].regulated_bus, Some(powerio::BusId(7)));

    let conv = write_pslf(&net);
    assert!(
        conv.warnings
            .iter()
            .any(|w| w.contains("remote regulated bus")),
        "expected a regulated-bus-drop warning, got {:?}",
        conv.warnings
    );
}

#[test]
fn pslf_reads_and_writes_a_three_winding_transformer() {
    let net = parse_pslf(EPC_3W).unwrap();
    assert_eq!(net.transformers_3w.len(), 1, "the tertiary record was read");
    assert!(net.branches.is_empty(), "a 3W is not folded into branches");
    let t = &net.transformers_3w[0];
    assert_eq!(
        [
            t.windings[0].bus.0,
            t.windings[1].bus.0,
            t.windings[2].bus.0
        ],
        [1, 2, 3]
    );
    // z12 = primary-secondary, z23 = secondary-tertiary, z31 = tertiary-primary.
    assert!((t.z[0].r - 0.01).abs() < 1e-9);
    assert!((t.z[1].r - 0.03).abs() < 1e-9);
    assert!((t.z[2].r - 0.02).abs() < 1e-9);
    assert!((t.windings[0].tap - 1.05).abs() < 1e-9);

    // Round trip through the writer keeps the buses, impedances, and primary tap.
    let net2 = parse_pslf(&write_pslf(&net).text).unwrap();
    assert_eq!(net2.transformers_3w.len(), 1);
    assert!(net2.branches.is_empty());
    let t2 = &net2.transformers_3w[0];
    assert!((t2.z[2].x - 0.07).abs() < 1e-9);
    assert!((t2.windings[0].tap - 1.05).abs() < 1e-9);
    assert_eq!(t2.windings[2].bus.0, 3);
}

/// A 3-bus EPC with a tertiary (3-winding) transformer record.
const EPC_3W: &str = r#"title
t3w
!
solution parameters
sbase 100.0000
!
bus data  [3] ty vsched volt angle ar zone vmax vmin
1 "B1          " 230.0000 : 0 1.0 1.0 0.0 1 1 1.1 0.9
2 "B2          " 138.0000 : 1 1.0 1.0 0.0 1 1 1.1 0.9
3 "B3          " 13.8000 : 1 1.0 1.0 0.0 1 1 1.1 0.9
transformer data  [1]
1 "B1          " 230.00 2 "B2          " 138.00 "1 " 1 "xf3" : 1 0 0 0 0 0 0 0 0 3 0 0 0 0 100 0.01 0.06 0.02 0.07 0.03 0.08 /
0 0 0 0 0 0 100 90 80 0 0.0 0 0 0 0 0 1.05
end
"#;

/// A two-winding transformer EPC plus a ZIP load, for the round-trip test.
const EPC_WITH_TRANSFORMER: &str = r#"title
xfmr case
!
solution parameters
sbase 100.0000
!
bus data  [2] ty vsched volt angle ar zone vmax vmin
1 "Slack       " 230.0000 : 0 1.0000 1.0000 0.0 1 1 1.1 0.9
2 "Load        " 138.0000 : 1 1.0000 1.0000 -1.0 1 1 1.1 0.9
transformer data  [1]
1 "Slack       " 230.00 2 "Load        " 138.00 "1 " 1 "xf" : 1 0 0 0 0 0 0 0 0 0 0 0 0 0 100 0.02 0.06 0 0 0 0 /
0 0 0 0 0 0 90 80 70 0 0.05 0 0 0 0 0 1.025
load data  [1] id long_id st mw mvar mw_i mvar_i mw_z mvar_z ar zone
2 "Load        " 138.00 "1 " "load" : 1 10 3 1 0.5 2 1.5 1 1
end
"#;

#[test]
fn malformed_pslf_input_returns_errors_without_panics() {
    for (text, expected) in [
        ("", "no buses"),
        ("title\nunterminated\n", "no buses"),
        (
            "bus data [1]\nnot-a-bus\nend\n",
            "bus id missing or invalid",
        ),
        (
            "bus data [1]\n1 \"A\" 230 : bad 1 1 0 1 1 1.1 0.9\nend\n",
            "bus type field 0 value",
        ),
    ] {
        let outcome = std::panic::catch_unwind(|| parse_str(text, "pslf"));
        assert!(outcome.is_ok(), "PSLF parser panicked on {text:?}");
        let err = outcome
            .unwrap()
            .expect_err("malformed PSLF input parsed successfully");
        assert!(
            err.to_string().contains(expected),
            "expected {expected:?} in {err}"
        );
    }
}

#[test]
fn pslf_missing_end_marker_warns_without_panic() {
    let text = "bus data [1]\n1 \"A\" 230 : 0 1 1 0 1 1 1.1 0.9 /\n";
    let outcome = std::panic::catch_unwind(|| parse_str(text, "pslf"));
    assert!(
        outcome.is_ok(),
        "PSLF parser panicked on missing end marker"
    );
    let parsed = outcome.unwrap().expect("single bus PSLF case should parse");
    assert!(
        parsed
            .warnings
            .iter()
            .any(|warning| warning.contains("no end marker")),
        "expected no end marker warning, got {:?}",
        parsed.warnings
    );
}

fn temp_path(name: &str) -> PathBuf {
    let mut path = std::env::temp_dir();
    path.push(format!(
        "powerio-pslf-test-{}-{name}",
        std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map_or(0, |d| d.as_nanos())
    ));
    path
}