ivordir / yalps Goto Github PK

The model:

{
  direction: 'maximize',
  objective: 'p1',
  constraints: {
    p1: { min: 0 },
    p2: { min: 2704 },
    p3: { min: 4221 },
    p4: { min: 0 },
    cost: { max: 11004 }
  },
  variables: {
    s1: { cost: 10, p1: 19, p2: 6, p3: 6 },
    s2: { cost: 10, p2: 24, p3: 6 },
    s3: { cost: 10, p2: 6, p3: 26 },
    s4: { cost: 10, p1: 31 },
    s5: { cost: 15, p1: 31, p2: 8, p3: 8 },
    s6: { cost: 15, p2: 36, p3: 8 },
    s7: { cost: 15, p2: 8, p3: 39 },
    s8: { cost: 15, p1: 46 },
    s9: { cost: 20, p1: 46, p2: 8, p3: 8 },
    s10: { cost: 20, p1: 8, p2: 51 },
    s11: { cost: 20, p1: 8, p3: 55 },
    s12: { cost: 20, p1: 61 }
  },
  integers: [
    's1',  's2',  's3',
    's4',  's5',  's6',
    's7',  's8',  's9',
    's10', 's11', 's12'
  ]
}

Hi @Ivordir (or others!). I'm new to Linear Solvers, and I need help modeling a simple battery charging scheme. To understand how it works I built a model that doesn't make sense in the real world, but it should help me understand why it doesn't work right now.

So I want to maximize the cost for charging a battery, and am looking for the optimum charge speed and discharge speed
The cost function that needs to be maximized is:

totalCost = 0.5*cs - 0.3*ds (where cs is charge speed, and ds is discharge speed)

There is a constraint for how full the battery can be loaded:
SoC must stay between 0 and 5
the SoC is calculated as a function from charge speed and discharge speed:
SoC = 2*cs - 1.5*ds

{
  direction: 'maximize',
  objective: 'totalCost',
  constraints: { SoC: { min: 0, max: 5 } },
  variables: {
    totalCost: { cs: 0.5, ds: -0.3 },
    SoC: { cs: 2, ds: -1.5 }
  }
}
{ status: 'optimal', result: -0, variables: [] }

So when running the model, I would expect that the maximum cost is where the battery is loaded to its maximum capacity. That would be where ds = 0 and cs = 5 / 2 = 2.5. The totalCost would then be 2.5 * 0.5 = 1.25

But as you can see I get result:-0 and no variables. What is wrong in my model? How do I get the expected result?

When importing YALPS, I get the following issue:

There are types at '/.../node_modules/yalps/lib/types/index.d.ts', but this result could not be resolved when respecting package.json "exports". The 'yalps' library may need to update its package.json or typings.