Fix implementation of exciter, new turbine governor model and refactor VBR models

[martinmoraga]

• fixes implementation of exciter DC1A model
• adds new turbine governor TGOV1 (Ref: Milano, Power system modelling and scripting p. 358)
• adds new validation notebook for controllers: SP_Validation_ReducedOrderSG_VBR_SMIB_Fault_withControllers.ipynb
• partially solves points of Refactor VBR models #75
• enables choice between thevenin and norton representation of VBR models, default is norton now
• adds reduced order SG models, exciter and turbine governor to dpsimpy

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[JTS22]

@martinmoraga Can you maybe push the pybind-binding code that does not work for you, along with the error message? Normally, you should be able to just bind the abstract base class along with any child classes like this (assuming stepInPerUnit is changed to be public):

	py::class_<CPS::DP::Ph1::ReducedOrderSynchronGeneratorVBR, std::shared_ptr<CPS::DP::Ph1::ReducedOrderSynchronGeneratorVBR>, CPS::SimPowerComp<CPS::Complex>>(mDPPh1, "BaseSynchronGeneratorReducedOrder", py::multiple_inheritance())
		.def("set_modelling_approach", &CPS::DP::Ph1::ReducedOrderSynchronGeneratorVBR::setModellingApproach)
		.def("step_in_per_unit", &CPS::DP::Ph1::ReducedOrderSynchronGeneratorVBR::stepInPerUnit);

	py::class_<CPS::DP::Ph1::SynchronGenerator3OrderVBR, std::shared_ptr<CPS::DP::Ph1::SynchronGenerator3OrderVBR>, CPS::DP::Ph1::ReducedOrderSynchronGeneratorVBR>(mDPPh1, "SynchronGenerator3OrderVBR", py::multiple_inheritance())
		.def(py::init<std::string>());

The base class is then non-constructible in Python but because Python only handles the shared pointers, methods can still take and return instances of the base class.
For a more comprehensive example, you can check the bindings in dpsim/src/pybind/Attributes.cpp where both AttributeBase and Attribute<T> are abstract classes that are bound to Python.

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42 Code Smells

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4.9% Duplication