能源 & Renewables

Wind farms, solar PV, oil & gas, 管道, 发电机

Interharmonics — The Power Quality Disturbance That Doesn’t Show Up on Standard Harmonic Analysers

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Interharmonics — frequency components that are not integer multiples of the fundamental (例如，. 75 赫兹, 130 Hz on a 50 Hz system) — are produced by PV inverters, wind turbines, 电动车充电器, cycloconverters, and HVDC links. Their most dangerous effect: an interharmonic at 58 Hz creates an 8 Hz beat frequency — squarely in the range of peak human visual sensitivity. Field case: simultaneous PV + EV charger + microwave on one LV circuit produces stochastic interharmonics causing light flicker. Standard IEC 61000-4-7 analysers cannot correctly characterise them.

Voltage Unbalance in DER-Rich Networks — When Solar PV Helps and When It Doesn’t

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Single-phase PV panels can either worsen or improve voltage unbalance on LV feeders — depending entirely on the existing load phase distribution. UPM Madrid analysis on the IEEE European LV Test Feeder shows PV reduced mean VUF from 1.255% 至 0.702% in a medium-unbalance scenario, but increased it from 0.787% 至 0.963% in a low-unbalance scenario. Equally important: IEEE PVUR1 and PVUR2 indices can overestimate the true VUF by a factor of 10–16× in DER-rich networks — the CIGRE index is the only reliable alternative that requires only line voltage magnitudes.

惊人国际 – Generators and Nonlinear Loads: How Harmonic Mitigation Eliminates the Oversizing Requirement

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Mirus International demonstrates that generators feeding non-linear loads must be derated or oversized to prevent excessive voltage distortion — standard practice adds 20–25% generator capacity. The Wide Spectrum Filter (Lineator) eliminates the oversizing requirement by reducing harmonic current drawn from the generator, enabling right-sized generator selection and significant capital and fuel savings.

惊人国际 – Sinewave Filter vs. dV/dT Filter for Long-Cable VFD Applications: A Head-to-Head Field Comparison

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Long cable VFD applications produce cable resonance that amplifies dV/dt at the motor terminals — causing insulation stress and premature motor failure. A dV/dt filter limits the voltage rise rate but does not produce a true sine wave. A sinewave filter eliminates both the resonance and the harmonic content. Field comparison at San Antonio Water Authority shows measured motor terminal voltage for both filter types.

惊人国际 – Harmonic Control at a Remote Oil Well: Better Than 18-Pulse Performance at 12-Pulse Cost

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Remote oil well site with a single-drive VFD application: multi-pulse transformer approaches were impractical at this location. Mirus Lineator passive filter achieved better than 18-pulse harmonic performance at 12-pulse cost — measured THID below 5% at the drive input. The case demonstrates that passive harmonic filters can outperform multi-pulse transformers in single-drive, isolated applications.

惊人国际 – Harmonic Mitigation for a Generator-Fed Motor Control Centre: Natural Gas Sweetening Plant

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Natural gas sweetening plant with a generator-fed motor control centre: the generator’s high source impedance amplified harmonic voltage distortion from VFD loads to levels that caused control system malfunctions. Mirus filter selection had to account for the generator impedance characteristics rather than infinite bus assumptions — a common oversight in generator-fed harmonic filter design.

惊人国际 – Harmonic Mitigation and Generator Rightsizing – A Pipeline Pumping Station Case Study

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Pipeline pumping station with generator-fed VFDs: harmonic current from the drives caused the generator to be significantly oversized — adding capital cost and reducing fuel efficiency. Mirus sinewave filter reduced harmonic current to allow generator rightsizing, improving fuel efficiency and reducing the generator procurement cost. Field results show measured harmonic distortion and generator loading before and after.

惊人国际 – Sinewave Filters for ESP Motor Protection: A Field Case Study in Filter Design and Motor Thermal Response

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Submersible ESP (Electric Submersible Pump) motors fed via VFDs through long cables: sinewave filter design must account for the cable capacitance, motor inductance, and the filter’s own resonant frequency. Incorrect filter design can produce resonance at a harmonic frequency, amplifying distortion rather than reducing it. Case documents the filter design process and measured thermal response of the motor under harmonic loading.

风力发电更可靠 (可靠的电力公司)

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一 27 MW wind farm in Newfoundland — nine 3 MW turbines — requires reliable substation control and protection power to safely detect faults and isolate them. A UPS was installed in the substation to maintain protection system availability during grid disturbances, preventing loss of the entire wind farm on a grid fault.

静止式变流器和电能质量

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Laboratory measurements on a 2.2 kW adjustable speed drive subjected to controlled voltage dips of varying magnitude and duration. The ASD’s DC bus capacitors and ride-through capability are characterised — showing the boundary between ride-through and trip as a function of sag depth and duration. Provides the experimental basis for ASD immunity specification in sensitive industrial applications.

分布式发电和电能质量

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Belgian MV distribution network segment used to study the impact of distributed generation technologies (wind, 光伏, CHP) on power quality and voltage stability. Four cable feeders from a 14 MVA 70/10 kV transformer. Analysis shows how DG penetration affects voltage profiles, harmonic injection, and voltage stability — with practical implications for network planning with high DG penetration.

风力发电 (HIOKI)

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Wind power generation creates unique PQ challenges: output voltage fluctuates with wind speed, frequency deviates from nominal, transient overvoltages occur from lightning and grid switching, and inrush current and harmonics accompany inverter operation. Simultaneous measurement of all parameters is essential for grid interconnection compliance assessment.

太阳能发电 (HIOKI)

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Solar PV power conditioners maintain output by monitoring grid voltage and frequency — but malfunction when grid voltage rises above threshold or frequency deviates. Problems include inverter trips, inability to sell back power due to overvoltage, and high-order harmonic injection from neighbouring PV systems. Field measurement identifies the dominant disturbance type.

风力发电的电能质量 & 互连问题 (Dranetz)

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Wind generation plant interconnection requires assessment of harmonics, 闪烁, voltage fluctuation, frequency deviation, and fault ride-through capability. Dranetz monitoring solutions cover both temporary commissioning assessment and permanent 24/7 monitoring for continuous interconnection compliance verification on wind farms of any size.

液体和气体泵/管道应用 (美国超导公司)

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Pipeline pump stations are moving to larger motors — 4160V in the 2,000–4,000 HP range, 15kV-class at 8,000–15,000 HP — creating significant flicker, 谐波, and reactive power management challenges. American Superconductor’s PQ-SVC system provides dynamic reactive compensation enabling larger motor sizes at existing substations without requiring substation upgrades.

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