[Diff since v0.18.1](lanl-ansi/PowerModels.jl@v0.18.1...v0.18.2)

**Closed issues:**
- correct_reference_buses! fails when the largest generator in component has status 0 (lanl-ansi#776)
- Wrong sign for b_fr, b_to in linear branch flow approximation (lanl-ansi#779)

**Merged pull requests:**
- Fix sign bug in BFA formulation (lanl-ansi#780) (@ccoffrin)

[Diff since v0.18.0](lanl-ansi/PowerModels.jl@v0.18.0...v0.18.1)

**Closed issues:**
- `SparseSDPWRMPowerModel` doesn't support multinetwork without nw=0 (lanl-ansi#769)
- Small typo in documentation, math model (lanl-ansi#771)
- Are there Include Lagrange multipliers in results from OPF? (lanl-ansi#772)
- post_opf not defined (lanl-ansi#775)

**Merged pull requests:**
- Fixed data processing of PWL costs with identical points (lanl-ansi#773) (@ccoffrin)
- Improve import all in psse parser (lanl-ansi#774) (@ccoffrin)

[Diff since v0.17.4](lanl-ansi/PowerModels.jl@v0.17.4...v0.18.0)

**Closed issues:**
- Result Count Update (lanl-ansi#646)
- Drop Support for JuMP v0.20 (lanl-ansi#673)
- Jacobian Computation (lanl-ansi#698)
- Flow Cuts Name (lanl-ansi#713)
- Revised PWL Data Processing (lanl-ansi#716)
- Obtaining incidence + PTDF matrix from network_data (lanl-ansi#728)
- Conjugate in Admittance Matrix (lanl-ansi#734)
- PowerFlow Result API (lanl-ansi#739)
- Update Infrastructure Models Conventions (01/2021) (lanl-ansi#757)
- Reference Bus Requirement in AdmittanceMatrix Data (lanl-ansi#760)
- Improve multi-network support in data processing functions (lanl-ansi#764)

**Merged pull requests:**
- UPD: Updates for new multi-infrastructure conventions (lanl-ansi#745) (@tasseff)
- PowerModels v0.18.0 (lanl-ansi#768) (@ccoffrin)

[Diff since v0.17.3](lanl-ansi/PowerModels.jl@v0.17.3...v0.17.4)

**Closed issues:**
- convert ramp rates to p.u. (lanl-ansi#561)
- dual variable extraction broken for `constraint_power_balance_ls` (lanl-ansi#741)
- pg_sqr Constraint in Conic Formulations (lanl-ansi#743)
- Mosek error in solving opf with SDPWRMPowerModel  (lanl-ansi#744)
- IV model not initializing (lanl-ansi#746)
- Getting INVALID_MODEL error while solving RMSE (lanl-ansi#748)
- Power Models Distribution State Estimation package conflict (lanl-ansi#751)
- Export PTI data (lanl-ansi#752)
- Track solver progress (lanl-ansi#759)

**Merged pull requests:**
- Fix duals for APO variant of constraint_power_balance_ls (lanl-ansi#742) (@ccoffrin)
- add support for Matpower ramp rates in data unit transformations (lanl-ansi#750) (@ccoffrin)
- Export to PTI (lanl-ansi#753) (@jbarberia)
- Add support for relax_integrality in run methods (lanl-ansi#755) (@ccoffrin)
- Basic-Data Idea (lanl-ansi#756) (@ccoffrin)

## PowerModels v0.17.3

[Diff since v0.17.2](lanl-ansi/PowerModels.jl@v0.17.2...v0.17.3)


**Closed issues:**
- How to use current_constraint_limits and define c_rating_a? Testing and Documentation enhancement? (lanl-ansi#727)
- Loading matpower files (lanl-ansi#731)
- Display or print model to LP file (lanl-ansi#735)
- Adding constraints after instantiating IV-model (lanl-ansi#736)
- Geographic location of buses (lanl-ansi#740)

**Merged pull requests:**
- PSSE Parsing and Bus Type Checking Robustness (lanl-ansi#738) (@ccoffrin)

## PowerModels v0.17.2

[Diff since v0.17.1](lanl-ansi/PowerModels.jl@v0.17.1...v0.17.2)


**Closed issues:**
- PSSE import - transformer impedance scaling and winding voltage (lanl-ansi#629)
- LPAC in TNEP (lanl-ansi#708)
- Branch results (lanl-ansi#720)
- Gen Power Variable Function Names (lanl-ansi#725)
- Load Power Function Name (lanl-ansi#726)
- Matpower parsing error - string "Inf" can not be parsed (lanl-ansi#729)

**Merged pull requests:**
- PSSE transformer Zeq scaling, winding and nominal voltage import all fix (lanl-ansi#722) (@KSepetanc)
- LPAC TNEP (lanl-ansi#724) (@jay-dave)
- Matpower Parser Fixes (lanl-ansi#732) (@ccoffrin)
- Update to use Generic Bounds On/Off Constraint (lanl-ansi#733) (@ccoffrin)

## PowerModels v0.17.1

[Diff since v0.17.0](lanl-ansi/PowerModels.jl@v0.17.0...v0.17.1)


**Closed issues:**
- Functions Names (lanl-ansi#555)
- Active/Reactive Constraint Names (lanl-ansi#656)
- Is `multiconductor` keyword argument still needed in `instantiate_model`? (lanl-ansi#670)
- Flow Names (lanl-ansi#671)
- Storage Constraint  (lanl-ansi#704)
- User-built Constraints (lanl-ansi#706)
- Add a flag to export only the matpower spec and not extra PowerModels data (lanl-ansi#707)
- PWL Cost Data Management (lanl-ansi#709)
- Problem with installation (lanl-ansi#711)
- PSSE parser three winding transformer (lanl-ansi#712)

**Merged pull requests:**
- Fix bugs relating to inactive buses in admittance matrix tools (lanl-ansi#710) (@ccoffrin)
- Improve Robustness of Matpower Export (lanl-ansi#714) (@ccoffrin)
- PSSE Transformer Status Support (lanl-ansi#715) (@ccoffrin)
- Improved PWL Processing during Model Building (lanl-ansi#717) (@ccoffrin)
- Improved OTS Tests (lanl-ansi#718) (@ccoffrin)

## PowerModels v0.17.0

[Diff since v0.16.0](lanl-ansi/PowerModels.jl@v0.16.0...v0.17.0)


**Closed issues:**
- Updates to Propagate Topology Status  (lanl-ansi#502)
- Using an out-of-scope variable - ref extensions (lanl-ansi#668)
- Unify Branch Flow Expressions (lanl-ansi#684)
- Modeling Layer Naming Convention (lanl-ansi#701)

**Merged pull requests:**
- Fix reactive power control in storage systems (lanl-ansi#699) (@frederikgeth)
- Rename Problem Modeling Functions (lanl-ansi#700) (@ccoffrin)
- Updates for PowerModels v0.17 (lanl-ansi#702) (@ccoffrin)

## PowerModels v0.16.0

[Diff since v0.15.5](lanl-ansi/PowerModels.jl@v0.15.5...v0.16.0)


**Closed issues:**
- Dedicated AC Power Flow Solver (lanl-ansi#590)
- Break propagate_topology_status! into seperate functions (lanl-ansi#677)

**Merged pull requests:**
- Updates for PowerModels v0.16 (lanl-ansi#696) (@ccoffrin)

## PowerModels v0.15.5

[Diff since v0.15.4](lanl-ansi/PowerModels.jl@v0.15.4...v0.15.5)


**Closed issues:**
- Best Output Behavior of Bus Phase Angles, when the model has no such variable (lanl-ansi#6)
- Unit Tests for Matpower Parser Error Messages (lanl-ansi#41)
- Documentation of Multi-Conductor (lanl-ansi#281)
- Remove pg_sqr variables from conic formulations (lanl-ansi#353)
- Robustness of constraint_thermal_limit with lowerbounds (lanl-ansi#399)
- Review Solution Collection Time (lanl-ansi#478)
- Solution builder fails on components with status=1 and their bus_status = 4 (lanl-ansi#606)

**Merged pull requests:**
- Fixes for PWL Cost Functions in Matpower Tools (lanl-ansi#687) (@ccoffrin)
- Remove Flow Variables from PF Definition (lanl-ansi#688) (@ccoffrin)
- NLSolve AC Power Flow Solver (lanl-ansi#689) (@ccoffrin)
- Minor Fix to the Mathematical Model Docs (lanl-ansi#690) (@ccoffrin)
- Use Generic InfrastructureModels Tools (lanl-ansi#691) (@ccoffrin)
- Update PWL Implementation to Extreme-Point Variant (lanl-ansi#692) (@ccoffrin)
- Fix some docstrings (lanl-ansi#693) (@raphaelsaavedra)
- Breaking Updates to Data Helper Functions (lanl-ansi#694) (@ccoffrin)
- Improved Generator Assignment in AC-PF (lanl-ansi#695) (@ccoffrin)