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 [WIP] Fix slack distribution failing when remaining mismatch is negligible #1303

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 [WIP] Fix slack distribution failing when remaining mismatch is negligible #1303

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26 changes: 19 additions & 7 deletions src/test/java/com/powsybl/openloadflow/ac/DistributedSlackOnGenerationTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,13 +22,7 @@
import com.powsybl.math.matrix.DenseMatrixFactory;
import com.powsybl.openloadflow.OpenLoadFlowParameters;
import com.powsybl.openloadflow.OpenLoadFlowProvider;
import com.powsybl.openloadflow.network.DistributedSlackNetworkFactory;
import com.powsybl.openloadflow.network.EurostagFactory;
import com.powsybl.openloadflow.network.FirstSlackBusSelector;
import com.powsybl.openloadflow.network.LfBus;
import com.powsybl.openloadflow.network.LfNetwork;
import com.powsybl.openloadflow.network.ReferenceBusSelectionMode;
import com.powsybl.openloadflow.network.SlackBusSelectionMode;
import com.powsybl.openloadflow.network.*;
import com.powsybl.openloadflow.network.impl.LfNetworkLoaderImpl;
import com.powsybl.openloadflow.network.util.ActivePowerDistribution;
import com.powsybl.openloadflow.util.LoadFlowAssert;
Expand Down Expand Up @@ -870,4 +864,22 @@ void testEpsilonDistribution() {
assertEquals(0.0, result.getComponentResults().get(0).getSlackBusResults().get(0).getActivePowerMismatch(), LoadFlowAssert.DELTA_POWER);
assertEquals(0.15, result.getComponentResults().get(0).getDistributedActivePower(), LoadFlowAssert.DELTA_POWER);
}

@Test
void testNegligibleRemainingMismatch() {
parametersExt.setSlackDistributionFailureBehavior(OpenLoadFlowParameters.SlackDistributionFailureBehavior.FAIL);
network.getGenerator("g1").setMaxP(115);
network.getGenerator("g2").setMaxP(245);
network.getGenerator("g3").setMaxP(105);
network.getGenerator("g4").setMaxP(135);
LoadFlowResult result = loadFlowRunner.run(network, parameters);
assertTrue(result.isFullyConverged()); // Load flow succeeds maxP are just high enough to distribute the entire slack mismatch

network.getGenerator("g1").setMaxP(114.999);
network.getGenerator("g2").setMaxP(244.999);
network.getGenerator("g3").setMaxP(104.999);
network.getGenerator("g4").setMaxP(134.999);
result = loadFlowRunner.run(network, parameters);
assertTrue(result.isFullyConverged()); // All generators are at maxP but remaining mismatch is negligible ( < slackBusMaxMismatch), load flow should succeed
}
}
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