grabowski
e2be7109b7
New `mppt-gui` command launches a tkinter app with: - Live numeric readouts for all 13 measurement channels - 4-panel real-time matplotlib graphs (power, efficiency, voltage, current) - Full supply control: voltage, current, OVP, slew, output on/off - Full load control: mode (CC/CR/CV/CP), setpoint, slew, load on/off - Meter settings: wiring mode, response speed, coupling per channel - CSV data logging with start/stop control - Red SAFE OFF button (also Escape key) bypasses command queue - Threaded architecture: instrument I/O never blocks the GUI - Fix apply() silently failing: use set_current + set_voltage instead Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
478 lines
16 KiB
Python
478 lines
16 KiB
Python
"""MPPT Testbench orchestrator -- coordinates all three instruments."""
|
|
|
|
from __future__ import annotations
|
|
|
|
import sys
|
|
import time
|
|
from dataclasses import dataclass, field
|
|
|
|
from it6500.driver import IT6500
|
|
from prodigit3366g.driver import Prodigit3366G
|
|
from hioki3193.driver import Hioki3193
|
|
|
|
|
|
# Values above this are HIOKI error codes (blank, over-range, scaling error)
|
|
ERROR_THRESHOLD = 1e90
|
|
|
|
# Default voltage to return to after a sweep
|
|
IDLE_VOLTAGE = 75.0
|
|
|
|
|
|
@dataclass
|
|
class SweepPoint:
|
|
"""A single point in an IV / efficiency sweep."""
|
|
|
|
# Supply setpoints
|
|
voltage_set: float
|
|
current_limit: float
|
|
|
|
# Load setpoint (for current sweeps)
|
|
load_setpoint: float = 0.0
|
|
|
|
# Supply measurements
|
|
supply_voltage: float = 0.0
|
|
supply_current: float = 0.0
|
|
supply_power: float = 0.0
|
|
|
|
# Load measurements
|
|
load_voltage: float = 0.0
|
|
load_current: float = 0.0
|
|
load_power: float = 0.0
|
|
|
|
# Power analyzer measurements
|
|
input_power: float = 0.0 # P5 (solar side)
|
|
output_power: float = 0.0 # P6 (load side)
|
|
efficiency: float = 0.0 # EFF1 (%)
|
|
|
|
timestamp: float = field(default_factory=time.time)
|
|
|
|
|
|
class MPPTTestbench:
|
|
"""Orchestrates IT6500D + Prodigit 3366G + HIOKI 3193-10 for MPPT testing.
|
|
|
|
Typical wiring:
|
|
IT6500D ──(+/-)──> MPPT Tracker Input ──(sense)──> HIOKI Ch5
|
|
MPPT Tracker Output ──(sense)──> HIOKI Ch6 ──(+/-)──> Prodigit 3366G
|
|
|
|
The HIOKI measures both sides and computes efficiency.
|
|
"""
|
|
|
|
METER_ITEMS = ("U5", "I5", "P5", "U6", "I6", "P6", "EFF1")
|
|
|
|
def __init__(
|
|
self,
|
|
supply: IT6500,
|
|
load: Prodigit3366G,
|
|
meter: Hioki3193,
|
|
) -> None:
|
|
self.supply = supply
|
|
self.load = load
|
|
self.meter = meter
|
|
|
|
def close(self) -> None:
|
|
"""Close all instrument connections."""
|
|
for inst in (self.supply, self.load, self.meter):
|
|
try:
|
|
inst.close()
|
|
except Exception:
|
|
pass
|
|
|
|
def __enter__(self) -> MPPTTestbench:
|
|
return self
|
|
|
|
def __exit__(self, *exc) -> None:
|
|
self.close()
|
|
|
|
# ── Instrument discovery helpers ──────────────────────────────────
|
|
|
|
@staticmethod
|
|
def find_supply(address: str | None) -> str:
|
|
"""Find the IT6500D VISA address."""
|
|
if address:
|
|
return address
|
|
import pyvisa
|
|
|
|
rm = pyvisa.ResourceManager()
|
|
resources = rm.list_resources()
|
|
rm.close()
|
|
itech = [r for r in resources if "2EC7" in r.upper() or "6522" in r.upper()]
|
|
if itech:
|
|
return itech[0]
|
|
usb = [r for r in resources if "USB" in r]
|
|
if usb:
|
|
return usb[0]
|
|
print("ERROR: No IT6500D supply found. Available:", list(resources))
|
|
sys.exit(1)
|
|
|
|
@staticmethod
|
|
def find_meter(address: str | None) -> str:
|
|
"""Find the HIOKI 3193-10 VISA address."""
|
|
if address:
|
|
return address
|
|
import pyvisa
|
|
|
|
rm = pyvisa.ResourceManager()
|
|
resources = rm.list_resources()
|
|
rm.close()
|
|
hioki = [r for r in resources if "3193" in r or "03EB" in r or "GPIB" in r]
|
|
if hioki:
|
|
return hioki[0]
|
|
print("ERROR: No HIOKI 3193-10 found. Available:", list(resources))
|
|
sys.exit(1)
|
|
|
|
# ── Setup ─────────────────────────────────────────────────────────
|
|
|
|
def setup_all(self) -> None:
|
|
"""Configure all instruments for MPPT testing."""
|
|
# Supply: remote mode
|
|
self.supply.remote()
|
|
|
|
# Load: remote mode, CC mode default
|
|
self.load.remote()
|
|
|
|
# Meter: 1P2W, DC coupling, auto-range, efficiency P6/P5
|
|
self.meter.set_wiring_mode("1P2W")
|
|
self.meter.set_coupling(5, "DC")
|
|
self.meter.set_coupling(6, "DC")
|
|
self.meter.set_voltage_auto(5, True)
|
|
self.meter.set_current_auto(5, True)
|
|
self.meter.set_voltage_auto(6, True)
|
|
self.meter.set_current_auto(6, True)
|
|
self.meter.set_response_speed("SLOW")
|
|
self.meter.set_efficiency(1, "P6", "P5")
|
|
|
|
# Display: 16-item SELECT view
|
|
# Left side (1-8): U5, I5, P5, EFF1, OFF, OFF, OFF, OFF
|
|
# Right side (9-16): U6, I6, P6, OFF, OFF, OFF, OFF, OFF
|
|
display_items = "U5,I5,P5,EFF1,OFF,OFF,OFF,OFF,U6,I6,P6,OFF,OFF,OFF,OFF,OFF"
|
|
self.meter.write(f":DISPlay:SELect16 {display_items}")
|
|
|
|
# ── Safe shutdown ─────────────────────────────────────────────────
|
|
|
|
def safe_off(self) -> None:
|
|
"""Turn off all outputs in safe order: load first, then supply."""
|
|
try:
|
|
self.load.load_off()
|
|
except Exception:
|
|
pass
|
|
try:
|
|
self.supply.output_off()
|
|
except Exception:
|
|
pass
|
|
|
|
# ── HIOKI auto-range wait ─────────────────────────────────────────
|
|
|
|
def _wait_meter_ready(
|
|
self,
|
|
max_retries: int = 30,
|
|
retry_delay: float = 2.0,
|
|
) -> dict[str, float]:
|
|
"""Read the meter, retrying until all values are valid (not over-range).
|
|
|
|
The HIOKI returns special error values (+9999.9E+99, +6666.6E+99)
|
|
while auto-ranging. This method keeps polling until all requested
|
|
items return real data.
|
|
|
|
Returns:
|
|
The MeasurementResult.values dict once all values are valid.
|
|
|
|
Raises:
|
|
TimeoutError: If still auto-ranging after max_retries.
|
|
"""
|
|
for attempt in range(max_retries):
|
|
result = self.meter.measure(*self.METER_ITEMS)
|
|
values = result.values
|
|
|
|
# Check if any value is an error code
|
|
if all(abs(v) < ERROR_THRESHOLD for v in values.values()):
|
|
return values
|
|
|
|
bad = [k for k, v in values.items() if abs(v) >= ERROR_THRESHOLD]
|
|
print(f" (auto-ranging: {', '.join(bad)} -- retrying {attempt + 1}/{max_retries})")
|
|
|
|
# Keep supply alive during the wait so it doesn't
|
|
# time out and show a front-panel error / beep
|
|
try:
|
|
self.supply.measure_voltage()
|
|
except Exception:
|
|
pass
|
|
|
|
time.sleep(retry_delay)
|
|
|
|
raise TimeoutError(
|
|
f"HIOKI still auto-ranging after {max_retries} retries"
|
|
)
|
|
|
|
# ── Measurement ───────────────────────────────────────────────────
|
|
|
|
def measure_all(self) -> dict[str, float]:
|
|
"""Take a synchronized reading from all three instruments.
|
|
|
|
Returns dict with keys:
|
|
supply_V, supply_I, supply_P,
|
|
load_V, load_I, load_P,
|
|
meter_U5, meter_I5, meter_P5,
|
|
meter_U6, meter_I6, meter_P6,
|
|
meter_EFF1
|
|
"""
|
|
supply = self.supply.measure_all()
|
|
load = self.load.measure_all()
|
|
meter = self.meter.measure(*self.METER_ITEMS)
|
|
|
|
return {
|
|
"supply_V": supply.voltage,
|
|
"supply_I": supply.current,
|
|
"supply_P": supply.power,
|
|
"load_V": load.voltage,
|
|
"load_I": load.current,
|
|
"load_P": load.power,
|
|
"meter_U5": meter.values.get("U5", 0.0),
|
|
"meter_I5": meter.values.get("I5", 0.0),
|
|
"meter_P5": meter.values.get("P5", 0.0),
|
|
"meter_U6": meter.values.get("U6", 0.0),
|
|
"meter_I6": meter.values.get("I6", 0.0),
|
|
"meter_P6": meter.values.get("P6", 0.0),
|
|
"meter_EFF1": meter.values.get("EFF1", 0.0),
|
|
}
|
|
|
|
# ── Sweep helper: record one point ────────────────────────────────
|
|
|
|
@staticmethod
|
|
def _query_safe(fn, retries: int = 3, delay: float = 0.5):
|
|
"""Call a measurement function with retries on VISA timeout."""
|
|
for attempt in range(retries):
|
|
try:
|
|
return fn()
|
|
except Exception:
|
|
if attempt == retries - 1:
|
|
raise
|
|
time.sleep(delay)
|
|
|
|
def _record_point(
|
|
self,
|
|
voltage_set: float,
|
|
current_limit: float,
|
|
load_setpoint: float = 0.0,
|
|
) -> SweepPoint:
|
|
"""Wait for meter auto-range, then record from all instruments.
|
|
|
|
Waits for the meter first (which keeps the supply alive via
|
|
keepalive pings), then reads supply and load with retry logic.
|
|
"""
|
|
meter_vals = self._wait_meter_ready()
|
|
supply = self._query_safe(self.supply.measure_all)
|
|
load = self._query_safe(self.load.measure_all)
|
|
|
|
return SweepPoint(
|
|
voltage_set=voltage_set,
|
|
current_limit=current_limit,
|
|
load_setpoint=load_setpoint,
|
|
supply_voltage=supply.voltage,
|
|
supply_current=supply.current,
|
|
supply_power=supply.power,
|
|
load_voltage=load.voltage,
|
|
load_current=load.current,
|
|
load_power=load.power,
|
|
input_power=meter_vals.get("P5", 0.0),
|
|
output_power=meter_vals.get("P6", 0.0),
|
|
efficiency=meter_vals.get("EFF1", 0.0),
|
|
)
|
|
|
|
@staticmethod
|
|
def _print_point(point: SweepPoint, label: str, value: float, unit: str) -> None:
|
|
"""Print a single sweep point to the console."""
|
|
print(
|
|
f" {label}={value:7.2f}{unit} "
|
|
f"P_in={point.input_power:8.2f}W "
|
|
f"P_out={point.output_power:8.2f}W "
|
|
f"EFF={point.efficiency:6.2f}%"
|
|
)
|
|
|
|
# ── IV Curve / Voltage Sweep ──────────────────────────────────────
|
|
|
|
def sweep_voltage(
|
|
self,
|
|
v_start: float,
|
|
v_stop: float,
|
|
v_step: float,
|
|
current_limit: float,
|
|
settle_time: float = 1.0,
|
|
load_setpoint: float = 0.0,
|
|
) -> list[SweepPoint]:
|
|
"""Sweep supply voltage and record measurements at each point.
|
|
|
|
After the sweep completes, the supply returns to IDLE_VOLTAGE (75V)
|
|
and stays ON.
|
|
|
|
Args:
|
|
v_start: Starting voltage (V).
|
|
v_stop: Final voltage (V).
|
|
v_step: Voltage step size (V). Sign is auto-corrected.
|
|
current_limit: Supply current limit (A) for the entire sweep.
|
|
settle_time: Seconds to wait after each voltage step before
|
|
polling the meter.
|
|
load_setpoint: The load setpoint value (for CSV recording).
|
|
"""
|
|
if v_step == 0:
|
|
raise ValueError("v_step cannot be zero")
|
|
|
|
# Auto-correct step direction
|
|
if v_start < v_stop and v_step < 0:
|
|
v_step = -v_step
|
|
elif v_start > v_stop and v_step > 0:
|
|
v_step = -v_step
|
|
|
|
self.supply.set_current(current_limit)
|
|
self.supply.output_on()
|
|
|
|
results: list[SweepPoint] = []
|
|
v = v_start
|
|
|
|
try:
|
|
while True:
|
|
if v_step > 0 and v > v_stop + v_step / 2:
|
|
break
|
|
if v_step < 0 and v < v_stop + v_step / 2:
|
|
break
|
|
|
|
self.supply.set_voltage(v)
|
|
time.sleep(settle_time)
|
|
|
|
point = self._record_point(v, current_limit, load_setpoint)
|
|
results.append(point)
|
|
self._print_point(point, "V_set", v, "V")
|
|
|
|
v += v_step
|
|
finally:
|
|
# Return to idle voltage and keep supply ON
|
|
self.supply.set_voltage(IDLE_VOLTAGE)
|
|
print(f"\n Supply returning to {IDLE_VOLTAGE:.0f}V (output stays ON)")
|
|
|
|
return results
|
|
|
|
# ── Load Current Sweep ────────────────────────────────────────────
|
|
|
|
def sweep_load_current(
|
|
self,
|
|
voltage: float,
|
|
current_limit: float,
|
|
i_start: float,
|
|
i_stop: float,
|
|
i_step: float,
|
|
settle_time: float = 1.0,
|
|
) -> list[SweepPoint]:
|
|
"""Sweep load current (CC mode) at a fixed supply voltage.
|
|
|
|
After the sweep completes, the supply returns to IDLE_VOLTAGE (75V)
|
|
and stays ON. The load is turned OFF.
|
|
|
|
Args:
|
|
voltage: Fixed supply voltage (V).
|
|
current_limit: Supply current limit (A).
|
|
i_start: Starting load current (A).
|
|
i_stop: Final load current (A).
|
|
i_step: Current step size (A). Sign is auto-corrected.
|
|
settle_time: Seconds to wait after each current step before
|
|
polling the meter.
|
|
"""
|
|
if i_step == 0:
|
|
raise ValueError("i_step cannot be zero")
|
|
|
|
# Auto-correct step direction
|
|
if i_start < i_stop and i_step < 0:
|
|
i_step = -i_step
|
|
elif i_start > i_stop and i_step > 0:
|
|
i_step = -i_step
|
|
|
|
self.supply.set_current(current_limit)
|
|
self.supply.set_voltage(voltage)
|
|
self.supply.output_on()
|
|
self.load.set_mode("CC")
|
|
self.load.set_cc_current(i_start)
|
|
self.load.load_on()
|
|
|
|
results: list[SweepPoint] = []
|
|
i = i_start
|
|
|
|
try:
|
|
while True:
|
|
if i_step > 0 and i > i_stop + i_step / 2:
|
|
break
|
|
if i_step < 0 and i < i_stop + i_step / 2:
|
|
break
|
|
|
|
self.load.set_cc_current(i)
|
|
time.sleep(settle_time)
|
|
|
|
point = self._record_point(voltage, current_limit, load_setpoint=i)
|
|
results.append(point)
|
|
self._print_point(point, "I_load", i, "A")
|
|
|
|
i += i_step
|
|
finally:
|
|
self.load.load_off()
|
|
# Return to idle voltage and keep supply ON
|
|
self.supply.set_voltage(IDLE_VOLTAGE)
|
|
print(f"\n Load OFF. Supply returning to {IDLE_VOLTAGE:.0f}V (output stays ON)")
|
|
|
|
return results
|
|
|
|
# ── Efficiency at fixed operating point ───────────────────────────
|
|
|
|
def measure_efficiency(
|
|
self,
|
|
voltage: float,
|
|
current_limit: float,
|
|
settle_time: float = 2.0,
|
|
samples: int = 5,
|
|
sample_interval: float = 1.0,
|
|
) -> dict[str, float]:
|
|
"""Measure average efficiency at a fixed operating point.
|
|
|
|
Args:
|
|
voltage: Supply voltage (V).
|
|
current_limit: Supply current limit (A).
|
|
settle_time: Seconds to wait before first measurement.
|
|
samples: Number of readings to average.
|
|
sample_interval: Seconds between readings.
|
|
|
|
Returns:
|
|
Dict with avg_input_power, avg_output_power, avg_efficiency,
|
|
plus individual supply/load readings.
|
|
"""
|
|
self.supply.set_current(current_limit)
|
|
self.supply.set_voltage(voltage)
|
|
self.supply.output_on()
|
|
time.sleep(settle_time)
|
|
|
|
p_in_sum = 0.0
|
|
p_out_sum = 0.0
|
|
eff_sum = 0.0
|
|
|
|
try:
|
|
for i in range(samples):
|
|
meter_vals = self._wait_meter_ready()
|
|
p_in = meter_vals.get("P5", 0.0)
|
|
p_out = meter_vals.get("P6", 0.0)
|
|
eff = meter_vals.get("EFF1", 0.0)
|
|
p_in_sum += p_in
|
|
p_out_sum += p_out
|
|
eff_sum += eff
|
|
print(
|
|
f" [{i + 1}/{samples}] "
|
|
f"P_in={p_in:8.2f}W P_out={p_out:8.2f}W EFF={eff:6.2f}%"
|
|
)
|
|
if i < samples - 1:
|
|
time.sleep(sample_interval)
|
|
finally:
|
|
self.supply.output_off()
|
|
|
|
return {
|
|
"avg_input_power": p_in_sum / samples,
|
|
"avg_output_power": p_out_sum / samples,
|
|
"avg_efficiency": eff_sum / samples,
|
|
"voltage_set": voltage,
|
|
"current_limit": current_limit,
|
|
"samples": samples,
|
|
}
|